[PATCH v2] Add livepatch kselftests

[PATCH v2] Add livepatch kselftests

[Joe Lawrence]

Round two cleans up a few misc script and build items, adds a shadow
variable test, and reduces the total livepatch kselftest runtime to ~45
seconds.

The tests run on top of Petr's v11 atomic replace feature and v2 of the
shadow variable enhancement patchsets:

  [PATCH 0/8] livepatch: Atomic replace feature
  https://lkml.kernel.org/r/20180323120028.31451-1-pmladek@suse.com

  [PATCH v2 0/2] livepatch: Allocate and free shadow variables more safely
  https://lkml.kernel.org/r/20180405122315.29065-1-pmladek@suse.com

Questions for v3:

  - Should we split off the atomic replace and shadow variable update
    tests so that the this patchset could be merged before the ones
    listed above?

  - I didn't remove any of the sample modules.  If anyone thinks any of
    them should go, let me know.  They serve as nice, simple examples so
    I thought they should all stay.

  - Module naming convention: to make the test script easier to grep
    module names and filenames, I broke with livepatch convention and
    used underscores instead of dashes.  I didn't think it worth the
    regex foo to flip back and forth in the test script.

  - More tests from Libor and Nicolai would be welcome!
    -- Maybe we separate quicktests (like these) from longer tests if
       needed?

Here's a sample output from a successful test run:

  % time make -C tools/testing/selftests TARGETS=livepatch run_tests
  make: Entering directory `/root/linux/tools/testing/selftests'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Nothing to be done for `all'.
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  TAP version 13
  selftests: test-livepatch.sh
  ========================================
  TEST: basic function patching ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace livepatch ... ok
  ok 1..1 selftests: test-livepatch.sh [PASS]
  selftests: test-callbacks.sh
  ========================================
  TEST: target module before livepatch ... ok
  TEST: module_coming notifier ... ok
  TEST: module_going notifier ... ok
  TEST: module_coming and module_going notifiers ... ok
  TEST: target module not present ... ok
  TEST: pre-patch callback -ENODEV ... ok
  TEST: module_coming + pre-patch callback -ENODEV ... ok
  TEST: multiple target modules ... ok
  TEST: busy target module ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace ... ok
  ok 1..2 selftests: test-callbacks.sh [PASS]
  selftests: test-shadow-vars.sh
  ========================================
  TEST: basic shadow variable API ... ok
  ok 1..3 selftests: test-shadow-vars.sh [PASS]
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make: Leaving directory `/root/linux/tools/testing/selftests'

  real    0m46.166s
  user    0m0.436s
  sys     0m1.244s


changes from v1:
- Only add $(CC_FLAGS_FTRACE) for target modules
- Remove between test delay
- Reduce RETRY_INTERVAL to .1 sec
- Reduce test_callback_mod's busymod_work_func delay from 60 to 10 sec
- s/PASS/ok and s/FAIL/not ok for test output
- Move test descriptions from Documentation/livepatch/callbacks.txt
  into tools/testing/selftests/livepatch/test-callbacks.sh
- Add a shadow variable test script and module
- Add a short tools/testing/selftests/livepatch/README
- to += linux-kselftest@vger.kernel.org
- cc += Libor, Nicolai, Artem

change from rfc:
- SPDX-License-Identifiers
- Moved livepatch test modules into lib/livepatch
- Renamed livepatch.sh (filename suffix)
- Reduced between-test delay time
- Split off common functions.sh file
- Split into separate livepatch, callbacks, and shadow-vars scrips
- Gave the tests short descriptions instead of TEST1, TEST2, etc.

Joe Lawrence (1):
  selftests/livepatch: introduce tests

 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

--
1.8.3.1

[PATCH v2] Add livepatch kselftests

[Joe Lawrence]

Round two cleans up a few misc script and build items, adds a shadow
variable test, and reduces the total livepatch kselftest runtime to ~45
seconds.

The tests run on top of Petr's v11 atomic replace feature and v2 of the
shadow variable enhancement patchsets:

  [PATCH 0/8] livepatch: Atomic replace feature
  https://lkml.kernel.org/r/20180323120028.31451-1-pmladek at suse.com

  [PATCH v2 0/2] livepatch: Allocate and free shadow variables more safely
  https://lkml.kernel.org/r/20180405122315.29065-1-pmladek at suse.com

Questions for v3:

  - Should we split off the atomic replace and shadow variable update
    tests so that the this patchset could be merged before the ones
    listed above?

  - I didn't remove any of the sample modules.  If anyone thinks any of
    them should go, let me know.  They serve as nice, simple examples so
    I thought they should all stay.

  - Module naming convention: to make the test script easier to grep
    module names and filenames, I broke with livepatch convention and
    used underscores instead of dashes.  I didn't think it worth the
    regex foo to flip back and forth in the test script.

  - More tests from Libor and Nicolai would be welcome!
    -- Maybe we separate quicktests (like these) from longer tests if
       needed?

Here's a sample output from a successful test run:

  % time make -C tools/testing/selftests TARGETS=livepatch run_tests
  make: Entering directory `/root/linux/tools/testing/selftests'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Nothing to be done for `all'.
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  TAP version 13
  selftests: test-livepatch.sh
  ========================================
  TEST: basic function patching ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace livepatch ... ok
  ok 1..1 selftests: test-livepatch.sh [PASS]
  selftests: test-callbacks.sh
  ========================================
  TEST: target module before livepatch ... ok
  TEST: module_coming notifier ... ok
  TEST: module_going notifier ... ok
  TEST: module_coming and module_going notifiers ... ok
  TEST: target module not present ... ok
  TEST: pre-patch callback -ENODEV ... ok
  TEST: module_coming + pre-patch callback -ENODEV ... ok
  TEST: multiple target modules ... ok
  TEST: busy target module ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace ... ok
  ok 1..2 selftests: test-callbacks.sh [PASS]
  selftests: test-shadow-vars.sh
  ========================================
  TEST: basic shadow variable API ... ok
  ok 1..3 selftests: test-shadow-vars.sh [PASS]
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make: Leaving directory `/root/linux/tools/testing/selftests'

  real    0m46.166s
  user    0m0.436s
  sys     0m1.244s


changes from v1:
- Only add $(CC_FLAGS_FTRACE) for target modules
- Remove between test delay
- Reduce RETRY_INTERVAL to .1 sec
- Reduce test_callback_mod's busymod_work_func delay from 60 to 10 sec
- s/PASS/ok and s/FAIL/not ok for test output
- Move test descriptions from Documentation/livepatch/callbacks.txt
  into tools/testing/selftests/livepatch/test-callbacks.sh
- Add a shadow variable test script and module
- Add a short tools/testing/selftests/livepatch/README
- to += linux-kselftest at vger.kernel.org
- cc += Libor, Nicolai, Artem

change from rfc:
- SPDX-License-Identifiers
- Moved livepatch test modules into lib/livepatch
- Renamed livepatch.sh (filename suffix)
- Reduced between-test delay time
- Split off common functions.sh file
- Split into separate livepatch, callbacks, and shadow-vars scrips
- Gave the tests short descriptions instead of TEST1, TEST2, etc.

Joe Lawrence (1):
  selftests/livepatch: introduce tests

 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

--
1.8.3.1

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[PATCH v2] Add livepatch kselftests

[joe.lawrence]

Round two cleans up a few misc script and build items, adds a shadow
variable test, and reduces the total livepatch kselftest runtime to ~45
seconds.

The tests run on top of Petr's v11 atomic replace feature and v2 of the
shadow variable enhancement patchsets:

  [PATCH 0/8] livepatch: Atomic replace feature
  https://lkml.kernel.org/r/20180323120028.31451-1-pmladek at suse.com

  [PATCH v2 0/2] livepatch: Allocate and free shadow variables more safely
  https://lkml.kernel.org/r/20180405122315.29065-1-pmladek at suse.com

Questions for v3:

  - Should we split off the atomic replace and shadow variable update
    tests so that the this patchset could be merged before the ones
    listed above?

  - I didn't remove any of the sample modules.  If anyone thinks any of
    them should go, let me know.  They serve as nice, simple examples so
    I thought they should all stay.

  - Module naming convention: to make the test script easier to grep
    module names and filenames, I broke with livepatch convention and
    used underscores instead of dashes.  I didn't think it worth the
    regex foo to flip back and forth in the test script.

  - More tests from Libor and Nicolai would be welcome!
    -- Maybe we separate quicktests (like these) from longer tests if
       needed?

Here's a sample output from a successful test run:

  % time make -C tools/testing/selftests TARGETS=livepatch run_tests
  make: Entering directory `/root/linux/tools/testing/selftests'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Nothing to be done for `all'.
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make[1]: Entering directory `/root/linux/tools/testing/selftests/livepatch'
  TAP version 13
  selftests: test-livepatch.sh
  ========================================
  TEST: basic function patching ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace livepatch ... ok
  ok 1..1 selftests: test-livepatch.sh [PASS]
  selftests: test-callbacks.sh
  ========================================
  TEST: target module before livepatch ... ok
  TEST: module_coming notifier ... ok
  TEST: module_going notifier ... ok
  TEST: module_coming and module_going notifiers ... ok
  TEST: target module not present ... ok
  TEST: pre-patch callback -ENODEV ... ok
  TEST: module_coming + pre-patch callback -ENODEV ... ok
  TEST: multiple target modules ... ok
  TEST: busy target module ... ok
  TEST: multiple livepatches ... ok
  TEST: atomic replace ... ok
  ok 1..2 selftests: test-callbacks.sh [PASS]
  selftests: test-shadow-vars.sh
  ========================================
  TEST: basic shadow variable API ... ok
  ok 1..3 selftests: test-shadow-vars.sh [PASS]
  make[1]: Leaving directory `/root/linux/tools/testing/selftests/livepatch'
  make: Leaving directory `/root/linux/tools/testing/selftests'

  real    0m46.166s
  user    0m0.436s
  sys     0m1.244s


changes from v1:
- Only add $(CC_FLAGS_FTRACE) for target modules
- Remove between test delay
- Reduce RETRY_INTERVAL to .1 sec
- Reduce test_callback_mod's busymod_work_func delay from 60 to 10 sec
- s/PASS/ok and s/FAIL/not ok for test output
- Move test descriptions from Documentation/livepatch/callbacks.txt
  into tools/testing/selftests/livepatch/test-callbacks.sh
- Add a shadow variable test script and module
- Add a short tools/testing/selftests/livepatch/README
- to += linux-kselftest at vger.kernel.org
- cc += Libor, Nicolai, Artem

change from rfc:
- SPDX-License-Identifiers
- Moved livepatch test modules into lib/livepatch
- Renamed livepatch.sh (filename suffix)
- Reduced between-test delay time
- Split off common functions.sh file
- Split into separate livepatch, callbacks, and shadow-vars scrips
- Gave the tests short descriptions instead of TEST1, TEST2, etc.

Joe Lawrence (1):
  selftests/livepatch: introduce tests

 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

--
1.8.3.1

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To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in
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[PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

Add a few livepatch modules and simple target modules that the included
regression suite can run tests against.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
---
 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

diff --git a/Documentation/livepatch/callbacks.txt b/Documentation/livepatch/callbacks.txt
index c9776f48e458..6ca2801a6bb9 100644
--- a/Documentation/livepatch/callbacks.txt
+++ b/Documentation/livepatch/callbacks.txt
@@ -116,490 +116,3 @@ virtnet_probe() initialized its driver's net_device features.  A
 pre/post-patch callback could iterate over all such devices, making a
 similar change to their hw_features value.  (Client functions of the
 value may need to be updated accordingly.)
-
-
-Test cases
-==========
-
-What follows is not an exhaustive test suite of every possible livepatch
-pre/post-(un)patch combination, but a selection that demonstrates a few
-important concepts.  Each test case uses the kernel modules located in
-the samples/livepatch/ and assumes that no livepatches are loaded at the
-beginning of the test.
-
-
-Test 1
-------
-
-Test a combination of loading a kernel module and a livepatch that
-patches a function in the first module.  (Un)load the target module
-before the livepatch module:
-
-- load target module
-- load livepatch
-- disable livepatch
-- unload target module
-- unload livepatch
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   34.475708] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch enable, before the livepatch transition starts, pre-patch
-callbacks are executed for vmlinux and livepatch_callbacks_mod (those
-klp_objects currently loaded).  After klp_objects are patched according
-to the klp_patch, their post-patch callbacks run and the transition
-completes:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   36.503719] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   36.504213] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   36.504238] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   36.504721] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   36.505849] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   37.727133] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   37.727232] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   37.727860] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   37.728792] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Similarly, on livepatch disable, pre-patch callbacks run before the
-unpatching transition starts.  klp_objects are reverted, post-patch
-callbacks execute and the transition completes:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   38.510209] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   38.510234] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   38.510982] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   38.512209] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   39.711132] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   39.711210] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   39.711779] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   39.712735] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   42.534183] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 2
-------
-
-This test is similar to the previous test, but (un)load the livepatch
-module before the target kernel module.  This tests the livepatch core's
-module_coming handler:
-
-- load livepatch
-- load target module
-- disable livepatch
-- unload livepatch
-- unload target module
-
-
-On livepatch enable, only pre/post-patch callbacks are executed for
-currently loaded klp_objects, in this case, vmlinux:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   44.553328] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   44.553997] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   44.554049] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   44.554845] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   45.727128] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   45.727212] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   45.727961] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted module is subsequently loaded, only its pre/post-patch
-callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   46.560845] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   46.561988] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.563452] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.565495] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch disable, all currently loaded klp_objects' (vmlinux and
-livepatch_callbacks_mod) pre/post-unpatch callbacks are executed:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   48.568885] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   48.568910] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   48.569441] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   48.570502] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   49.759091] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   49.759171] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   49.759742] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   49.760690] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   52.592283] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 3
-------
-
-Test loading the livepatch after a targeted kernel module, then unload
-the kernel module before disabling the livepatch.  This tests the
-livepatch core's module_going handler:
-
-- load target module
-- load livepatch
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load a target module, then the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   54.607948] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   56.613919] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   56.614411] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   56.614436] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   56.614818] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   56.615656] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   57.759070] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   57.759147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   57.759621] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   57.760307] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a target module is unloaded, the livepatch is only reverted from
-that klp_object (livepatch_callbacks_mod).  As such, only its pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   58.623409] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   58.623903] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   58.624658] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   58.625305] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-When the livepatch is disabled, pre and post-unpatch callbacks are run
-for the remaining klp_object, vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   60.638420] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   60.638444] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   60.638996] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   61.727088] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   61.727165] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   61.727985] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 4
-------
-
-This test is similar to the previous test, however the livepatch is
-loaded first.  This tests the livepatch core's module_coming and
-module_going handlers:
-
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   64.661552] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   64.662147] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   64.662175] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   64.662850] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   65.695056] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   65.695147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   65.695561] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted kernel module is subsequently loaded, only its
-pre/post-patch callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   66.669196] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   66.669882] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.670744] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.672873] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-When the target module is unloaded, the livepatch is only reverted from
-the livepatch_callbacks_mod klp_object.  As such, only pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   68.680065] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   68.680688] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   68.681452] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   68.682094] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   70.689225] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   70.689256] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   70.689882] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   71.711080] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   71.711481] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   71.711988] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 5
-------
-
-A simple test of loading a livepatch without one of its patch target
-klp_objects ever loaded (livepatch_callbacks_mod):
-
-- load livepatch
-- disable livepatch
-- unload livepatch
-
-Load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   74.711081] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   74.711595] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   74.711639] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   74.712272] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   75.743137] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   75.743219] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   75.743867] livepatch: 'livepatch_callbacks_demo': patching complete
-
-As expected, only pre/post-(un)patch handlers are executed for vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   76.716254] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   76.716278] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   76.716666] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   77.727089] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   77.727194] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   77.727907] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 6
-------
-
-Test a scenario where a vmlinux pre-patch callback returns a non-zero
-status (ie, failure):
-
-- load target module
-- load livepatch -ENODEV
-- unload target module
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   80.740520] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Load the livepatch module, setting its 'pre_patch_ret' value to -19
-(-ENODEV).  When its vmlinux pre-patch callback executed, this status
-code will propagate back to the module-loading subsystem.  The result is
-that the insmod command refuses to load the livepatch module:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko pre_patch_ret=-19
-  [   82.747326] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   82.747743] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   82.747767] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   82.748237] livepatch: pre-patch callback failed for object 'vmlinux'
-  [   82.748637] livepatch: failed to enable patch 'livepatch_callbacks_demo'
-  [   82.749059] livepatch: 'livepatch_callbacks_demo': canceling transition, going to unpatch
-  [   82.749060] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   82.749868] livepatch: 'livepatch_callbacks_demo': unpatching complete
-  [   82.765809] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-demo.ko: No such device
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   84.774238] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 7
-------
-
-Similar to the previous test, setup a livepatch such that its vmlinux
-pre-patch callback returns success.  However, when a targeted kernel
-module is later loaded, have the livepatch return a failing status code:
-
-- load livepatch
-- setup -ENODEV
-- load target module
-- disable livepatch
-- unload livepatch
-
-Load the livepatch, notice vmlinux pre-patch callback succeeds:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   86.787845] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   86.788325] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   86.788427] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   86.788821] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   87.711069] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   87.711143] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   87.711886] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Set a trap so subsequent pre-patch callbacks to this livepatch will
-return -ENODEV:
-
-  % echo -19 > /sys/module/livepatch_callbacks_demo/parameters/pre_patch_ret
-
-The livepatch pre-patch callback for subsequently loaded target modules
-will return failure, so the module loader refuses to load the kernel
-module.  Notice that no post-patch or pre/post-unpatch callbacks are
-executed for this klp_object:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   90.796976] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   90.797834] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   90.798900] livepatch: pre-patch callback failed for object 'livepatch_callbacks_mod'
-  [   90.799652] livepatch: patch 'livepatch_callbacks_demo' failed for module 'livepatch_callbacks_mod', refusing to load module 'livepatch_callbacks_mod'
-  [   90.819737] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-mod.ko: No such device
-
-However, pre/post-unpatch callbacks run for the vmlinux klp_object:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   92.823547] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   92.823573] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   92.824331] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   93.727128] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   93.727327] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   93.727861] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 8
-------
-
-Test loading multiple targeted kernel modules.  This test-case is
-mainly for comparing with the next test-case.
-
-- load busy target module (0s sleep),
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load a target "busy" kernel module which kicks off a worker function
-that immediately exits:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=0
-  [   96.910107] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [   96.910600] livepatch_callbacks_busymod: busymod_work_func, sleeping 0 seconds ...
-  [   96.913024] livepatch_callbacks_busymod: busymod_work_func exit
-
-Proceed with loading the livepatch and another ordinary target module,
-notice that the post-patch callbacks are executed and the transition
-completes quickly:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   98.917892] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   98.918426] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   98.918453] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   98.918955] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   98.923835] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   99.743104] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   99.743156] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   99.743679] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   99.744616] livepatch: 'livepatch_callbacks_demo': patching complete
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  100.930955] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  100.931668] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.932645] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.934125] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  102.942805] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  102.943640] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [  102.944585] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  102.945455] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  104.953815] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [  104.953838] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [  104.954431] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  104.955426] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  106.719073] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  106.722633] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  106.723282] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  106.724279] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  108.975660] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
-
-
-Test 9
-------
-
-A similar test as the previous one, but force the "busy" kernel module
-to do longer work.
-
-The livepatching core will refuse to patch a task that is currently
-executing a to-be-patched function -- the consistency model stalls the
-current patch transition until this safety-check is met.  Test a
-scenario where one of a livepatch's target klp_objects sits on such a
-function for a long time.  Meanwhile, load and unload other target
-kernel modules while the livepatch transition is in progress.
-
-- load busy target module (30s sleep)
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load the "busy" kernel module, this time make it do 30 seconds worth of
-work:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=30
-  [  110.993362] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [  110.994059] livepatch_callbacks_busymod: busymod_work_func, sleeping 30 seconds ...
-
-Meanwhile, the livepatch is loaded.  Notice that the patch transition
-does not complete as the targeted "busy" module is sitting on a
-to-be-patched function:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [  113.000309] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [  113.000764] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [  113.000791] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [  113.001289] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  113.005208] livepatch: 'livepatch_callbacks_demo': starting patching transition
-
-Load a second target module (this one is an ordinary idle kernel
-module).  Note that *no* post-patch callbacks will be executed while the
-livepatch is still in transition:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  115.012740] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  115.013406] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  115.015315] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Request an unload of the simple kernel module.  The patch is still
-transitioning, so its pre-unpatch callbacks are skipped:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  117.022626] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  117.023376] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  117.024533] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-Finally the livepatch is disabled.  Since none of the patch's
-klp_object's post-patch callbacks executed, the remaining klp_object's
-pre-unpatch callbacks are skipped:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  119.035408] livepatch: 'livepatch_callbacks_demo': reversing transition from patching to unpatching
-  [  119.035485] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  119.711166] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  119.714179] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  119.714653] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  119.715437] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  141.279111] livepatch_callbacks_busymod: busymod_work_func exit
-  [  141.279760] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 64155e310a9f..e4a0e81542ff 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1932,6 +1932,18 @@ config TEST_DEBUG_VIRTUAL
 
 	  If unsure, say N.
 
+config TEST_LIVEPATCH
+	tristate "Test livepatching"
+	default n
+	depends on LIVEPATCH
+	depends on m
+	help
+	  Test various kernel livepatching features for correctness.
+	  The tests will load test modules that will be livepatched
+	  in various scenarios.
+
+	  If unsure, say N.
+
 endif # RUNTIME_TESTING_MENU
 
 config MEMTEST
diff --git a/lib/Makefile b/lib/Makefile
index a90d4fcd748f..98a38441afb0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -67,6 +67,8 @@ obj-$(CONFIG_TEST_PARMAN) += test_parman.o
 obj-$(CONFIG_TEST_KMOD) += test_kmod.o
 obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
 
+obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
+
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
diff --git a/lib/livepatch/Makefile b/lib/livepatch/Makefile
new file mode 100644
index 000000000000..26900ddaef82
--- /dev/null
+++ b/lib/livepatch/Makefile
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for livepatch test code.
+
+obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
+				test_klp_callbacks_demo.o \
+				test_klp_callbacks_demo2.o \
+				test_klp_callbacks_busy.o \
+				test_klp_callbacks_mod.o \
+				test_klp_livepatch.o \
+				test_klp_shadow_vars.o
+
+# Target modules to be livepatched require CC_FLAGS_FTRACE
+CFLAGS_test_klp_callbacks_busy.o	+= $(CC_FLAGS_FTRACE)
+CFLAGS_test_klp_callbacks_mod.o		+= $(CC_FLAGS_FTRACE)
diff --git a/lib/livepatch/test_klp_atomic_replace.c b/lib/livepatch/test_klp_atomic_replace.c
new file mode 100644
index 000000000000..d1bcf6b0cfb3
--- /dev/null
+++ b/lib/livepatch/test_klp_atomic_replace.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+#include <linux/seq_file.h>
+static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "meminfo_proc_show",
+		.new_func = livepatch_meminfo_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+	/* set .replace in the init function below for demo purposes */
+};
+
+static int test_klp_atomic_replace_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_atomic_replace_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_atomic_replace_init);
+module_exit(test_klp_atomic_replace_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: atomic replace");
diff --git a/lib/livepatch/test_klp_callbacks_busy.c b/lib/livepatch/test_klp_callbacks_busy.c
new file mode 100644
index 000000000000..40beddf8a0e2
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_busy.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+
+static int sleep_secs;
+module_param(sleep_secs, int, 0644);
+MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
+
+static void busymod_work_func(struct work_struct *work);
+static DECLARE_DELAYED_WORK(work, busymod_work_func);
+
+static void busymod_work_func(struct work_struct *work)
+{
+	pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
+	msleep(sleep_secs * 1000);
+	pr_info("%s exit\n", __func__);
+}
+
+static int test_klp_callbacks_busy_init(void)
+{
+	pr_info("%s\n", __func__);
+	schedule_delayed_work(&work,
+		msecs_to_jiffies(1000 * 0));
+	return 0;
+}
+
+static void test_klp_callbacks_busy_exit(void)
+{
+	cancel_delayed_work_sync(&work);
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_busy_init);
+module_exit(test_klp_callbacks_busy_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: busy target module");
diff --git a/lib/livepatch/test_klp_callbacks_demo.c b/lib/livepatch/test_klp_callbacks_demo.c
new file mode 100644
index 000000000000..87fc61445c5f
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int pre_patch_ret;
+module_param(pre_patch_ret, int, 0644);
+MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return pre_patch_ret;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static void patched_work_func(struct work_struct *work)
+{
+	pr_info("%s\n", __func__);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_func busymod_funcs[] = {
+	{
+		.old_name = "busymod_work_func",
+		.new_func = patched_work_func,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_mod",
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_busy",
+		.funcs = busymod_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo");
diff --git a/lib/livepatch/test_klp_callbacks_demo2.c b/lib/livepatch/test_klp_callbacks_demo2.c
new file mode 100644
index 000000000000..c2a6c7b40424
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo2.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return 0;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo2_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo2_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo2_init);
+module_exit(test_klp_callbacks_demo2_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
diff --git a/lib/livepatch/test_klp_callbacks_mod.c b/lib/livepatch/test_klp_callbacks_mod.c
new file mode 100644
index 000000000000..8fbe645b1c2c
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_mod.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+static int test_klp_callbacks_mod_init(void)
+{
+	pr_info("%s\n", __func__);
+	return 0;
+}
+
+static void test_klp_callbacks_mod_exit(void)
+{
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_mod_init);
+module_exit(test_klp_callbacks_mod_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: target module");
diff --git a/lib/livepatch/test_klp_livepatch.c b/lib/livepatch/test_klp_livepatch.c
new file mode 100644
index 000000000000..4014754c8da8
--- /dev/null
+++ b/lib/livepatch/test_klp_livepatch.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+#include <linux/seq_file.h>
+static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "cmdline_proc_show",
+		.new_func = livepatch_cmdline_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_livepatch_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_livepatch_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_livepatch_init);
+module_exit(test_klp_livepatch_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Seth Jennings <sjenning@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch module");
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c
new file mode 100644
index 000000000000..05f45747c081
--- /dev/null
+++ b/lib/livepatch/test_klp_shadow_vars.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/livepatch.h>
+#include <linux/slab.h>
+
+/*
+ * Keep a small list of pointers so that we can print address-agnostic
+ * pointer values.  Use a rolling integer count to differentiate the values.
+ * Ironically we could have used the shadow variable API to do this, but
+ * let's not lean too heavily on the very code we're testing.
+ */
+static LIST_HEAD(ptr_list);
+struct shadow_ptr {
+	void *ptr;
+	int id;
+	struct list_head list;
+};
+
+void free_ptr_list(void)
+{
+	struct shadow_ptr *sp, *tmp_sp;
+
+	list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
+		list_del(&sp->list);
+		kfree(sp);
+	}
+}
+
+int ptr_id(void *ptr)
+{
+	struct shadow_ptr *sp;
+	static int count;
+
+	list_for_each_entry(sp, &ptr_list, list) {
+		if (sp->ptr == ptr)
+			return sp->id;
+	}
+
+	sp = kmalloc(sizeof(*sp), GFP_KERNEL);
+	if (!sp)
+		return -1;
+	sp->ptr = ptr;
+	sp->id = count++;
+
+	list_add(&sp->list, &ptr_list);
+
+	return sp->id;
+}
+
+/*
+ * Shadow variable wrapper functions that echo the function and arguments
+ * to the kernel log for testing verification.  Don't display raw pointers,
+ * but use the ptr_id() value instead.
+ */
+void *shadow_get(void *obj, unsigned long id)
+{
+	void *ret = klp_shadow_get(obj, id);
+
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
+		__func__, ptr_id(obj), id, ptr_id(ret));
+
+	return ret;
+}
+
+void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags,
+		   klp_shadow_ctor_t ctor, void *ctor_data)
+{
+	void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
+				     ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
+			  gfp_t gfp_flags, klp_shadow_ctor_t ctor,
+			  void *ctor_data)
+{
+	void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
+					    ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free(obj, id, dtor);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
+		__func__, ptr_id(obj), id, ptr_id(dtor));
+}
+
+void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free_all(id, dtor);
+	pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n",
+		__func__, id, ptr_id(dtor));
+}
+
+
+/* Shadow variable constructor - remember simple pointer data */
+static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
+{
+	int **shadow_int = shadow_data;
+	*shadow_int = ctor_data;
+	pr_info("%s: PTR%d -> PTR%d\n",
+		__func__, ptr_id(shadow_int), ptr_id(ctor_data));
+
+	return 0;
+}
+
+static void shadow_dtor(void *obj, void *shadow_data)
+{
+	pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
+		__func__, ptr_id(obj), ptr_id(shadow_data));
+}
+
+static int test_klp_shadow_vars_init(void)
+{
+	void *obj			= THIS_MODULE;
+	int id			= 0x1234;
+	size_t size		= sizeof(int *);
+	gfp_t gfp_flags		= GFP_KERNEL;
+
+	int var1, var2, var3, var4;
+	int **sv1, **sv2, **sv3, **sv4;
+
+	void *ret;
+
+	ptr_id(0);
+	ptr_id(&var1);
+	ptr_id(&var2);
+	ptr_id(&var3);
+	ptr_id(&var4);
+
+	/*
+	 * With an empty shadow variable hash table, expect not to find
+	 * any matches.
+	 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * Allocate a few shadow variables with different <obj> and <id>.
+	 */
+	sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
+	sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
+	sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
+
+	/*
+	 * Verify we can find our new shadow variables and that they point
+	 * to expected data.
+	 */
+	ret = shadow_get(obj, id);
+	if (ret == sv1 && *sv1 == &var1)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv1), ptr_id(*sv1));
+	ret = shadow_get(obj + 1, id);
+	if (ret == sv2 && *sv2 == &var2)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv2), ptr_id(*sv2));
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Allocate or get a few more, this time with the same <obj>, <id>.
+	 * The second invocation should return the same shadow var.
+	 */
+	sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	if (ret == sv4 && *sv4 == &var4)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv4), ptr_id(*sv4));
+
+	/*
+	 * Free the <obj=*, id> shadow variables and check that we can no
+	 * longer find them.
+	 */
+	shadow_free(obj, id, shadow_dtor);			/* sv1 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 1, id, shadow_dtor);			/* sv2 */
+	ret = shadow_get(obj + 1, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 2, id, shadow_dtor);			/* sv4 */
+	ret = shadow_get(obj + 2, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * We should still find an <id+1> variable.
+	 */
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Free all the <id+1> variables, too.
+	 */
+	shadow_free_all(id + 1, shadow_dtor);			/* sv3 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  shadow_get() got expected NULL result\n");
+
+
+	free_ptr_list();
+
+	return 0;
+}
+
+static void test_klp_shadow_vars_exit(void)
+{
+}
+
+module_init(test_klp_shadow_vars_init);
+module_init(test_klp_shadow_vars_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence@redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: shadow variables");
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..d92c63bde9b6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -15,6 +15,7 @@ TARGETS += intel_pstate
 TARGETS += ipc
 TARGETS += kcmp
 TARGETS += lib
+TARGETS += livepatch
 TARGETS += membarrier
 TARGETS += memfd
 TARGETS += memory-hotplug
diff --git a/tools/testing/selftests/livepatch/Makefile b/tools/testing/selftests/livepatch/Makefile
new file mode 100644
index 000000000000..af4aee79bebb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_GEN_PROGS := \
+	test-livepatch.sh \
+	test-callbacks.sh \
+	test-shadow-vars.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/livepatch/config b/tools/testing/selftests/livepatch/config
new file mode 100644
index 000000000000..0dd7700464a8
--- /dev/null
+++ b/tools/testing/selftests/livepatch/config
@@ -0,0 +1 @@
+CONFIG_TEST_LIVEPATCH=m
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
new file mode 100644
index 000000000000..7aaef80e9edb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -0,0 +1,196 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+# Shell functions for the rest of the scripts.
+
+MAX_RETRIES=600
+RETRY_INTERVAL=".1"	# seconds
+
+# die(msg) - game over, man
+#	msg - dying words
+function die() {
+	echo "ERROR: $1" >&2
+	exit 1
+}
+
+# set_dynamic_debug() - setup kernel dynamic debug
+#	TODO - push and pop this config?
+function set_dynamic_debug() {
+	cat << EOF > /sys/kernel/debug/dynamic_debug/control
+file kernel/livepatch/* +p
+func klp_try_switch_task -p
+EOF
+}
+
+# wait_for_transition(modname)
+#	modname - livepatch module name
+wait_for_transition() {
+	local mod="$1"; shift
+
+	# Wait for livepatch transition  ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/transition) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to complete transition for module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# load_mod(modname, params) - load a kernel module
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ ! -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to load module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		# Wait for livepatch in sysfs ...
+		local i=0
+		while [ ! -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to load module $mod (sysfs)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# load_failing_mod(modname, params) - load a kernel module, expect to fail
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_failing_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" == "" ]]; then
+		echo "$mod unexpectedly loaded" > /dev/kmsg
+		die "$mod unexpectedly loaded"
+	fi
+	echo "$ret" > /dev/kmsg
+}
+
+# unload_mod(modname) - unload a kernel module
+#	modname - module name to unload
+function unload_mod() {
+	local mod="$1"
+
+	# Wait for module reference count to clear ...
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/refcnt) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (refcnt)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	echo "% rmmod $mod" > /dev/kmsg
+	ret=$(rmmod "$mod" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (/sys/module)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch sysfs if applicable ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		local i=0
+		while [ -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to unload module $mod (/sys/livepatch)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# display_lp(modname) - disable a livepatch
+#	modname - module name to unload
+function disable_lp() {
+	local mod="$1"
+
+        echo "% echo 0 > /sys/kernel/livepatch/$mod/enabled" > /dev/kmsg
+        echo 0 > /sys/kernel/livepatch/"$mod"/enabled
+
+	# Wait for livepatch enable to clear ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/enabled) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to disable livepatch $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# set_pre_patch_ret(modname, pre_patch_ret)
+#	modname - module name to set
+#	pre_patch_ret - new pre_patch_ret value
+function set_pre_patch_ret {
+	local mod="$1"; shift
+        local ret="$1"
+
+        echo "% echo $1 > /sys/module/$mod/parameters/pre_patch_ret" > /dev/kmsg
+        echo "$1" > /sys/module/"$mod"/parameters/pre_patch_ret
+
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/parameters/pre_patch_ret) != "$1" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to set pre_patch_ret parameter for $mod module"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# filter_dmesg() - print a filtered dmesg
+#	TODO - better filter, out of order msgs, etc?
+function check_result {
+	local expect="$*"
+	local result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')
+
+	if [[ "$expect" == "$result" ]] ; then
+		echo "ok"
+	else
+		echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
+		die "livepatch kselftest(s) failed"
+	fi
+}
diff --git a/tools/testing/selftests/livepatch/test-callbacks.sh b/tools/testing/selftests/livepatch/test-callbacks.sh
new file mode 100755
index 000000000000..739d09bb3cff
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-callbacks.sh
@@ -0,0 +1,607 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_callbacks_demo
+MOD_LIVEPATCH2=test_klp_callbacks_demo2
+MOD_TARGET=test_klp_callbacks_mod
+MOD_TARGET_BUSY=test_klp_callbacks_busy
+
+set_dynamic_debug
+
+
+# TEST: target module before livepatch
+#
+# Test a combination of loading a kernel module and a livepatch that
+# patches a function in the first module.  Load the target module
+# before the livepatch module.  Unload them in the same order.
+#
+# - On livepatch enable, before the livepatch transition starts,
+#   pre-patch callbacks are executed for vmlinux and $MOD_TARGET (those
+#   klp_objects currently loaded).  After klp_objects are patched
+#   according to the klp_patch, their post-patch callbacks run and the
+#   transition completes.
+#
+# - Similarly, on livepatch disable, pre-patch callbacks run before the
+#   unpatching transition starts.  klp_objects are reverted, post-patch
+#   callbacks execute and the transition completes.
+
+echo -n "TEST: target module before livepatch ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming notifier
+#
+# This test is similar to the previous test, but (un)load the livepatch
+# module before the target kernel module.  This tests the livepatch
+# core's module_coming handler.
+#
+# - On livepatch enable, only pre/post-patch callbacks are executed for
+#   currently loaded klp_objects, in this case, vmlinux.
+#
+# - When a targeted module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - On livepatch disable, all currently loaded klp_objects' (vmlinux and
+#   $MOD_TARGET) pre/post-unpatch callbacks are executed.
+
+echo -n "TEST: module_coming notifier ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_going notifier
+#
+# Test loading the livepatch after a targeted kernel module, then unload
+# the kernel module before disabling the livepatch.  This tests the
+# livepatch core's module_going handler.
+#
+# - First load a target module, then the livepatch.
+#
+# - When a target module is unloaded, the livepatch is only reverted
+#   from that klp_object ($MOD_TARGET).  As such, only its pre and
+#   post-unpatch callbacks are executed when this occurs.
+#
+# - When the livepatch is disabled, pre and post-unpatch callbacks are
+#   run for the remaining klp_object, vmlinux.
+
+echo -n "TEST: module_going notifier ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: module_coming and module_going notifiers
+#
+# This test is similar to the previous test, however the livepatch is
+# loaded first.  This tests the livepatch core's module_coming and
+# module_going handlers.
+#
+# - First load the livepatch.
+#
+# - When a targeted kernel module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - When the target module is unloaded, the livepatch is only reverted
+#   from the $MOD_TARGET klp_object.  As such, only pre and
+#   post-unpatch callbacks are executed when this occurs.
+
+echo -n "TEST: module_coming and module_going notifiers ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: target module not present
+#
+# A simple test of loading a livepatch without one of its patch target
+# klp_objects ever loaded ($MOD_TARGET).
+#
+# - Load the livepatch.
+#
+# - As expected, only pre/post-(un)patch handlers are executed for
+#   vmlinux.
+
+echo -n "TEST: target module not present ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: pre-patch callback -ENODEV
+#
+# Test a scenario where a vmlinux pre-patch callback returns a non-zero
+# status (ie, failure).
+#
+# - First load a target module.
+#
+# - Load the livepatch module, setting its 'pre_patch_ret' value to -19
+#   (-ENODEV).  When its vmlinux pre-patch callback executes, this
+#   status code will propagate back to the module-loading subsystem.
+#   The result is that the insmod command refuses to load the livepatch
+#   module.
+
+echo -n "TEST: pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_failing_mod $MOD_LIVEPATCH pre_patch_ret=-19
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH pre_patch_ret=-19
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: failed to enable patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+modprobe: ERROR: could not insert '$MOD_LIVEPATCH': No such device
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming + pre-patch callback -ENODEV
+#
+# Similar to the previous test, setup a livepatch such that its vmlinux
+# pre-patch callback returns success.  However, when a targeted kernel
+# module is later loaded, have the livepatch return a failing status
+# code.
+#
+# - Load the livepatch, vmlinux pre-patch callback succeeds.
+#
+# - Set a trap so subsequent pre-patch callbacks to this livepatch will
+#   return -ENODEV.
+#
+# - The livepatch pre-patch callback for subsequently loaded target
+#   modules will return failure, so the module loader refuses to load
+#   the kernel module.  No post-patch or pre/post-unpatch callbacks are
+#   executed for this klp_object.
+#
+# - Pre/post-unpatch callbacks are run for the vmlinux klp_object.
+
+echo -n "TEST: module_coming + pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+set_pre_patch_ret $MOD_LIVEPATCH -19
+load_failing_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: patch '$MOD_LIVEPATCH' failed for module '$MOD_TARGET', refusing to load module '$MOD_TARGET'
+modprobe: ERROR: could not insert '$MOD_TARGET': No such device
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple target modules
+#
+# Test loading multiple targeted kernel modules.  This test-case is
+# mainly for comparing with the next test-case.
+#
+# - Load a target "busy" kernel module which kicks off a worker function
+#   that immediately exits.
+#
+# - Proceed with loading the livepatch and another ordinary target
+#   module.  Post-patch callbacks are executed and the transition
+#   completes quickly.
+
+echo -n "TEST: multiple target modules ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=0
+# give $MOD_TARGET_BUSY::busymod_work_func() a chance to run
+sleep 5
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=0
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 0 seconds ...
+$MOD_TARGET_BUSY: busymod_work_func exit
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+
+# TEST: busy target module
+#
+# A similar test as the previous one, but force the "busy" kernel module
+# to do longer work.
+#
+# The livepatching core will refuse to patch a task that is currently
+# executing a to-be-patched function -- the consistency model stalls the
+# current patch transition until this safety-check is met.  Test a
+# scenario where one of a livepatch's target klp_objects sits on such a
+# function for a long time.  Meanwhile, load and unload other target
+# kernel modules while the livepatch transition is in progress.
+#
+# - Load the "busy" kernel module, this time make it do 10 seconds worth
+#   of work.
+#
+# - Meanwhile, the livepatch is loaded.  Notice that the patch
+#   transition does not complete as the targeted "busy" module is
+#   sitting on a to-be-patched function.
+#
+# - Load a second target module (this one is an ordinary idle kernel
+#   module).  Note that *no* post-patch callbacks will be executed while
+#   the livepatch is still in transition.
+#
+# - Request an unload of the simple kernel module.  The patch is still
+#   transitioning, so its pre-unpatch callbacks are skipped.
+#
+# - Finally the livepatch is disabled.  Since none of the patch's
+#   klp_object's post-patch callbacks executed, the remaining
+#   klp_object's pre-unpatch callbacks are skipped.
+
+echo -n "TEST: busy target module ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=10
+load_mod $MOD_LIVEPATCH
+# Don't wait for transition, load $MOD_TARGET while the transition
+# is still stalled in $MOD_TARGET_BUSY::busymod_work_func()
+sleep 5
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=10
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 10 seconds ...
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': reversing transition from patching to unpatching
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: busymod_work_func exit
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+# TEST: multiple livepatches
+#
+# Test loading multiple livepatches.  This test-case is mainly for comparing
+# with the next test-case.
+#
+# - Load and unload two livepatches, pre and post (un)patch callbacks
+#   execute as each patch progresses through its (un)patching
+#   transition.
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace
+#
+# Load multiple livepatches, but the second as an 'atomic-replace'
+# patch.  When the latter laods, the original livepatch should be
+# disabled and *none* of its pre/post-unpatch callbacks executed.  On
+# the other hand, when the atomic-replace livepatch is disabled, its
+# pre/post-unpatch callbacks *should* be executed.
+#
+# - Load and unload two livepatches, the second of which has its
+#   .replace flag set true.
+#
+# - Pre and post patch callbacks are executed for both livepatches.
+#
+# - Once the atomic replace module is loaded, only its pre and post
+#   unpatch callbacks are executed.
+
+echo -n "TEST: atomic replace ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2 replace=1
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2 replace=1
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-livepatch.sh b/tools/testing/selftests/livepatch/test-livepatch.sh
new file mode 100755
index 000000000000..3e4b8072da84
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-livepatch.sh
@@ -0,0 +1,173 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_livepatch
+MOD_REPLACE=test_klp_atomic_replace
+
+set_dynamic_debug
+
+
+# TEST: basic function patching
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - unload the livepatch and make sure the patch was removed
+
+echo -n "TEST: basic function patching ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple livepatches
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load another livepatch and verify that both livepatches are active
+# - unload the second livepatch and verify that the first is still active
+# - unload the first livepatch and verify none are active
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=0
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=0
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_LIVEPATCH: this has been live patched
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE
+$MOD_LIVEPATCH: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace livepatch
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load an atomic replace livepatch and verify that only the second is active
+# - remove the first livepatch and verify that the atomic replace livepatch
+#   is still active
+# - remove the atomic replace livepatch and verify that none are active
+
+echo -n "TEST: atomic replace livepatch ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=1
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=1
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_REPLACE: this has been live patched
+% rmmod $MOD_LIVEPATCH
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-shadow-vars.sh b/tools/testing/selftests/livepatch/test-shadow-vars.sh
new file mode 100755
index 000000000000..96390a21b15d
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-shadow-vars.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence@redhat.com>
+
+. functions.sh
+
+MOD_TEST=test_klp_shadow_vars
+
+set_dynamic_debug
+
+
+# TEST: basic shadow variable API
+# - load a module that exercises the shadow variable API
+
+echo -n "TEST: basic shadow variable API ... "
+dmesg -C
+
+load_mod $MOD_TEST
+unload_mod $MOD_TEST
+
+check_result "% modprobe $MOD_TEST
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_ctor: PTR6 -> PTR1
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
+$MOD_TEST: shadow_ctor: PTR8 -> PTR2
+$MOD_TEST: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
+$MOD_TEST: shadow_ctor: PTR10 -> PTR3
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
+$MOD_TEST:   got expected PTR6 -> PTR1 result
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
+$MOD_TEST:   got expected PTR8 -> PTR2 result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_ctor: PTR11 -> PTR4
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST:   got expected PTR11 -> PTR4 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR6)
+$MOD_TEST: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR9, shadow_data=PTR8)
+$MOD_TEST: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR12, shadow_data=PTR11)
+$MOD_TEST: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR10)
+$MOD_TEST: klp_shadow_free_all(id=0x1235, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   shadow_get() got expected NULL result
+% rmmod test_klp_shadow_vars"
+
+exit 0
-- 
1.8.3.1

[PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

Add a few livepatch modules and simple target modules that the included
regression suite can run tests against.

Signed-off-by: Joe Lawrence <joe.lawrence at redhat.com>
---
 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

diff --git a/Documentation/livepatch/callbacks.txt b/Documentation/livepatch/callbacks.txt
index c9776f48e458..6ca2801a6bb9 100644
--- a/Documentation/livepatch/callbacks.txt
+++ b/Documentation/livepatch/callbacks.txt
@@ -116,490 +116,3 @@ virtnet_probe() initialized its driver's net_device features.  A
 pre/post-patch callback could iterate over all such devices, making a
 similar change to their hw_features value.  (Client functions of the
 value may need to be updated accordingly.)
-
-
-Test cases
-==========
-
-What follows is not an exhaustive test suite of every possible livepatch
-pre/post-(un)patch combination, but a selection that demonstrates a few
-important concepts.  Each test case uses the kernel modules located in
-the samples/livepatch/ and assumes that no livepatches are loaded at the
-beginning of the test.
-
-
-Test 1
-------
-
-Test a combination of loading a kernel module and a livepatch that
-patches a function in the first module.  (Un)load the target module
-before the livepatch module:
-
-- load target module
-- load livepatch
-- disable livepatch
-- unload target module
-- unload livepatch
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   34.475708] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch enable, before the livepatch transition starts, pre-patch
-callbacks are executed for vmlinux and livepatch_callbacks_mod (those
-klp_objects currently loaded).  After klp_objects are patched according
-to the klp_patch, their post-patch callbacks run and the transition
-completes:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   36.503719] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   36.504213] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   36.504238] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   36.504721] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   36.505849] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   37.727133] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   37.727232] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   37.727860] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   37.728792] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Similarly, on livepatch disable, pre-patch callbacks run before the
-unpatching transition starts.  klp_objects are reverted, post-patch
-callbacks execute and the transition completes:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   38.510209] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   38.510234] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   38.510982] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   38.512209] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   39.711132] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   39.711210] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   39.711779] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   39.712735] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   42.534183] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 2
-------
-
-This test is similar to the previous test, but (un)load the livepatch
-module before the target kernel module.  This tests the livepatch core's
-module_coming handler:
-
-- load livepatch
-- load target module
-- disable livepatch
-- unload livepatch
-- unload target module
-
-
-On livepatch enable, only pre/post-patch callbacks are executed for
-currently loaded klp_objects, in this case, vmlinux:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   44.553328] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   44.553997] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   44.554049] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   44.554845] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   45.727128] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   45.727212] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   45.727961] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted module is subsequently loaded, only its pre/post-patch
-callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   46.560845] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   46.561988] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.563452] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.565495] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch disable, all currently loaded klp_objects' (vmlinux and
-livepatch_callbacks_mod) pre/post-unpatch callbacks are executed:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   48.568885] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   48.568910] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   48.569441] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   48.570502] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   49.759091] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   49.759171] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   49.759742] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   49.760690] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   52.592283] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 3
-------
-
-Test loading the livepatch after a targeted kernel module, then unload
-the kernel module before disabling the livepatch.  This tests the
-livepatch core's module_going handler:
-
-- load target module
-- load livepatch
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load a target module, then the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   54.607948] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   56.613919] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   56.614411] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   56.614436] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   56.614818] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   56.615656] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   57.759070] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   57.759147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   57.759621] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   57.760307] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a target module is unloaded, the livepatch is only reverted from
-that klp_object (livepatch_callbacks_mod).  As such, only its pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   58.623409] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   58.623903] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   58.624658] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   58.625305] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-When the livepatch is disabled, pre and post-unpatch callbacks are run
-for the remaining klp_object, vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   60.638420] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   60.638444] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   60.638996] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   61.727088] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   61.727165] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   61.727985] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 4
-------
-
-This test is similar to the previous test, however the livepatch is
-loaded first.  This tests the livepatch core's module_coming and
-module_going handlers:
-
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   64.661552] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   64.662147] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   64.662175] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   64.662850] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   65.695056] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   65.695147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   65.695561] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted kernel module is subsequently loaded, only its
-pre/post-patch callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   66.669196] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   66.669882] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.670744] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.672873] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-When the target module is unloaded, the livepatch is only reverted from
-the livepatch_callbacks_mod klp_object.  As such, only pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   68.680065] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   68.680688] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   68.681452] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   68.682094] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   70.689225] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   70.689256] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   70.689882] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   71.711080] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   71.711481] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   71.711988] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 5
-------
-
-A simple test of loading a livepatch without one of its patch target
-klp_objects ever loaded (livepatch_callbacks_mod):
-
-- load livepatch
-- disable livepatch
-- unload livepatch
-
-Load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   74.711081] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   74.711595] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   74.711639] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   74.712272] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   75.743137] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   75.743219] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   75.743867] livepatch: 'livepatch_callbacks_demo': patching complete
-
-As expected, only pre/post-(un)patch handlers are executed for vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   76.716254] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   76.716278] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   76.716666] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   77.727089] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   77.727194] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   77.727907] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 6
-------
-
-Test a scenario where a vmlinux pre-patch callback returns a non-zero
-status (ie, failure):
-
-- load target module
-- load livepatch -ENODEV
-- unload target module
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   80.740520] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Load the livepatch module, setting its 'pre_patch_ret' value to -19
-(-ENODEV).  When its vmlinux pre-patch callback executed, this status
-code will propagate back to the module-loading subsystem.  The result is
-that the insmod command refuses to load the livepatch module:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko pre_patch_ret=-19
-  [   82.747326] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   82.747743] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   82.747767] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   82.748237] livepatch: pre-patch callback failed for object 'vmlinux'
-  [   82.748637] livepatch: failed to enable patch 'livepatch_callbacks_demo'
-  [   82.749059] livepatch: 'livepatch_callbacks_demo': canceling transition, going to unpatch
-  [   82.749060] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   82.749868] livepatch: 'livepatch_callbacks_demo': unpatching complete
-  [   82.765809] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-demo.ko: No such device
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   84.774238] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 7
-------
-
-Similar to the previous test, setup a livepatch such that its vmlinux
-pre-patch callback returns success.  However, when a targeted kernel
-module is later loaded, have the livepatch return a failing status code:
-
-- load livepatch
-- setup -ENODEV
-- load target module
-- disable livepatch
-- unload livepatch
-
-Load the livepatch, notice vmlinux pre-patch callback succeeds:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   86.787845] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   86.788325] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   86.788427] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   86.788821] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   87.711069] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   87.711143] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   87.711886] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Set a trap so subsequent pre-patch callbacks to this livepatch will
-return -ENODEV:
-
-  % echo -19 > /sys/module/livepatch_callbacks_demo/parameters/pre_patch_ret
-
-The livepatch pre-patch callback for subsequently loaded target modules
-will return failure, so the module loader refuses to load the kernel
-module.  Notice that no post-patch or pre/post-unpatch callbacks are
-executed for this klp_object:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   90.796976] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   90.797834] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   90.798900] livepatch: pre-patch callback failed for object 'livepatch_callbacks_mod'
-  [   90.799652] livepatch: patch 'livepatch_callbacks_demo' failed for module 'livepatch_callbacks_mod', refusing to load module 'livepatch_callbacks_mod'
-  [   90.819737] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-mod.ko: No such device
-
-However, pre/post-unpatch callbacks run for the vmlinux klp_object:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   92.823547] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   92.823573] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   92.824331] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   93.727128] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   93.727327] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   93.727861] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 8
-------
-
-Test loading multiple targeted kernel modules.  This test-case is
-mainly for comparing with the next test-case.
-
-- load busy target module (0s sleep),
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load a target "busy" kernel module which kicks off a worker function
-that immediately exits:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=0
-  [   96.910107] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [   96.910600] livepatch_callbacks_busymod: busymod_work_func, sleeping 0 seconds ...
-  [   96.913024] livepatch_callbacks_busymod: busymod_work_func exit
-
-Proceed with loading the livepatch and another ordinary target module,
-notice that the post-patch callbacks are executed and the transition
-completes quickly:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   98.917892] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   98.918426] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   98.918453] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   98.918955] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   98.923835] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   99.743104] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   99.743156] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   99.743679] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   99.744616] livepatch: 'livepatch_callbacks_demo': patching complete
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  100.930955] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  100.931668] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.932645] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.934125] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  102.942805] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  102.943640] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [  102.944585] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  102.945455] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  104.953815] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [  104.953838] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [  104.954431] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  104.955426] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  106.719073] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  106.722633] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  106.723282] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  106.724279] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  108.975660] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
-
-
-Test 9
-------
-
-A similar test as the previous one, but force the "busy" kernel module
-to do longer work.
-
-The livepatching core will refuse to patch a task that is currently
-executing a to-be-patched function -- the consistency model stalls the
-current patch transition until this safety-check is met.  Test a
-scenario where one of a livepatch's target klp_objects sits on such a
-function for a long time.  Meanwhile, load and unload other target
-kernel modules while the livepatch transition is in progress.
-
-- load busy target module (30s sleep)
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load the "busy" kernel module, this time make it do 30 seconds worth of
-work:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=30
-  [  110.993362] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [  110.994059] livepatch_callbacks_busymod: busymod_work_func, sleeping 30 seconds ...
-
-Meanwhile, the livepatch is loaded.  Notice that the patch transition
-does not complete as the targeted "busy" module is sitting on a
-to-be-patched function:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [  113.000309] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [  113.000764] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [  113.000791] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [  113.001289] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  113.005208] livepatch: 'livepatch_callbacks_demo': starting patching transition
-
-Load a second target module (this one is an ordinary idle kernel
-module).  Note that *no* post-patch callbacks will be executed while the
-livepatch is still in transition:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  115.012740] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  115.013406] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  115.015315] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Request an unload of the simple kernel module.  The patch is still
-transitioning, so its pre-unpatch callbacks are skipped:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  117.022626] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  117.023376] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  117.024533] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-Finally the livepatch is disabled.  Since none of the patch's
-klp_object's post-patch callbacks executed, the remaining klp_object's
-pre-unpatch callbacks are skipped:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  119.035408] livepatch: 'livepatch_callbacks_demo': reversing transition from patching to unpatching
-  [  119.035485] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  119.711166] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  119.714179] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  119.714653] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  119.715437] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  141.279111] livepatch_callbacks_busymod: busymod_work_func exit
-  [  141.279760] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 64155e310a9f..e4a0e81542ff 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1932,6 +1932,18 @@ config TEST_DEBUG_VIRTUAL
 
 	  If unsure, say N.
 
+config TEST_LIVEPATCH
+	tristate "Test livepatching"
+	default n
+	depends on LIVEPATCH
+	depends on m
+	help
+	  Test various kernel livepatching features for correctness.
+	  The tests will load test modules that will be livepatched
+	  in various scenarios.
+
+	  If unsure, say N.
+
 endif # RUNTIME_TESTING_MENU
 
 config MEMTEST
diff --git a/lib/Makefile b/lib/Makefile
index a90d4fcd748f..98a38441afb0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -67,6 +67,8 @@ obj-$(CONFIG_TEST_PARMAN) += test_parman.o
 obj-$(CONFIG_TEST_KMOD) += test_kmod.o
 obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
 
+obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
+
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
diff --git a/lib/livepatch/Makefile b/lib/livepatch/Makefile
new file mode 100644
index 000000000000..26900ddaef82
--- /dev/null
+++ b/lib/livepatch/Makefile
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for livepatch test code.
+
+obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
+				test_klp_callbacks_demo.o \
+				test_klp_callbacks_demo2.o \
+				test_klp_callbacks_busy.o \
+				test_klp_callbacks_mod.o \
+				test_klp_livepatch.o \
+				test_klp_shadow_vars.o
+
+# Target modules to be livepatched require CC_FLAGS_FTRACE
+CFLAGS_test_klp_callbacks_busy.o	+= $(CC_FLAGS_FTRACE)
+CFLAGS_test_klp_callbacks_mod.o		+= $(CC_FLAGS_FTRACE)
diff --git a/lib/livepatch/test_klp_atomic_replace.c b/lib/livepatch/test_klp_atomic_replace.c
new file mode 100644
index 000000000000..d1bcf6b0cfb3
--- /dev/null
+++ b/lib/livepatch/test_klp_atomic_replace.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+#include <linux/seq_file.h>
+static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "meminfo_proc_show",
+		.new_func = livepatch_meminfo_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+	/* set .replace in the init function below for demo purposes */
+};
+
+static int test_klp_atomic_replace_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_atomic_replace_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_atomic_replace_init);
+module_exit(test_klp_atomic_replace_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: atomic replace");
diff --git a/lib/livepatch/test_klp_callbacks_busy.c b/lib/livepatch/test_klp_callbacks_busy.c
new file mode 100644
index 000000000000..40beddf8a0e2
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_busy.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+
+static int sleep_secs;
+module_param(sleep_secs, int, 0644);
+MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
+
+static void busymod_work_func(struct work_struct *work);
+static DECLARE_DELAYED_WORK(work, busymod_work_func);
+
+static void busymod_work_func(struct work_struct *work)
+{
+	pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
+	msleep(sleep_secs * 1000);
+	pr_info("%s exit\n", __func__);
+}
+
+static int test_klp_callbacks_busy_init(void)
+{
+	pr_info("%s\n", __func__);
+	schedule_delayed_work(&work,
+		msecs_to_jiffies(1000 * 0));
+	return 0;
+}
+
+static void test_klp_callbacks_busy_exit(void)
+{
+	cancel_delayed_work_sync(&work);
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_busy_init);
+module_exit(test_klp_callbacks_busy_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: busy target module");
diff --git a/lib/livepatch/test_klp_callbacks_demo.c b/lib/livepatch/test_klp_callbacks_demo.c
new file mode 100644
index 000000000000..87fc61445c5f
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int pre_patch_ret;
+module_param(pre_patch_ret, int, 0644);
+MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return pre_patch_ret;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static void patched_work_func(struct work_struct *work)
+{
+	pr_info("%s\n", __func__);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_func busymod_funcs[] = {
+	{
+		.old_name = "busymod_work_func",
+		.new_func = patched_work_func,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_mod",
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_busy",
+		.funcs = busymod_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo");
diff --git a/lib/livepatch/test_klp_callbacks_demo2.c b/lib/livepatch/test_klp_callbacks_demo2.c
new file mode 100644
index 000000000000..c2a6c7b40424
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo2.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return 0;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo2_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo2_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo2_init);
+module_exit(test_klp_callbacks_demo2_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
diff --git a/lib/livepatch/test_klp_callbacks_mod.c b/lib/livepatch/test_klp_callbacks_mod.c
new file mode 100644
index 000000000000..8fbe645b1c2c
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_mod.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+static int test_klp_callbacks_mod_init(void)
+{
+	pr_info("%s\n", __func__);
+	return 0;
+}
+
+static void test_klp_callbacks_mod_exit(void)
+{
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_mod_init);
+module_exit(test_klp_callbacks_mod_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: target module");
diff --git a/lib/livepatch/test_klp_livepatch.c b/lib/livepatch/test_klp_livepatch.c
new file mode 100644
index 000000000000..4014754c8da8
--- /dev/null
+++ b/lib/livepatch/test_klp_livepatch.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2014 Seth Jennings <sjenning at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+#include <linux/seq_file.h>
+static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "cmdline_proc_show",
+		.new_func = livepatch_cmdline_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_livepatch_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_livepatch_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_livepatch_init);
+module_exit(test_klp_livepatch_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Seth Jennings <sjenning at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch module");
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c
new file mode 100644
index 000000000000..05f45747c081
--- /dev/null
+++ b/lib/livepatch/test_klp_shadow_vars.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/livepatch.h>
+#include <linux/slab.h>
+
+/*
+ * Keep a small list of pointers so that we can print address-agnostic
+ * pointer values.  Use a rolling integer count to differentiate the values.
+ * Ironically we could have used the shadow variable API to do this, but
+ * let's not lean too heavily on the very code we're testing.
+ */
+static LIST_HEAD(ptr_list);
+struct shadow_ptr {
+	void *ptr;
+	int id;
+	struct list_head list;
+};
+
+void free_ptr_list(void)
+{
+	struct shadow_ptr *sp, *tmp_sp;
+
+	list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
+		list_del(&sp->list);
+		kfree(sp);
+	}
+}
+
+int ptr_id(void *ptr)
+{
+	struct shadow_ptr *sp;
+	static int count;
+
+	list_for_each_entry(sp, &ptr_list, list) {
+		if (sp->ptr == ptr)
+			return sp->id;
+	}
+
+	sp = kmalloc(sizeof(*sp), GFP_KERNEL);
+	if (!sp)
+		return -1;
+	sp->ptr = ptr;
+	sp->id = count++;
+
+	list_add(&sp->list, &ptr_list);
+
+	return sp->id;
+}
+
+/*
+ * Shadow variable wrapper functions that echo the function and arguments
+ * to the kernel log for testing verification.  Don't display raw pointers,
+ * but use the ptr_id() value instead.
+ */
+void *shadow_get(void *obj, unsigned long id)
+{
+	void *ret = klp_shadow_get(obj, id);
+
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
+		__func__, ptr_id(obj), id, ptr_id(ret));
+
+	return ret;
+}
+
+void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags,
+		   klp_shadow_ctor_t ctor, void *ctor_data)
+{
+	void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
+				     ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
+			  gfp_t gfp_flags, klp_shadow_ctor_t ctor,
+			  void *ctor_data)
+{
+	void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
+					    ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free(obj, id, dtor);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
+		__func__, ptr_id(obj), id, ptr_id(dtor));
+}
+
+void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free_all(id, dtor);
+	pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n",
+		__func__, id, ptr_id(dtor));
+}
+
+
+/* Shadow variable constructor - remember simple pointer data */
+static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
+{
+	int **shadow_int = shadow_data;
+	*shadow_int = ctor_data;
+	pr_info("%s: PTR%d -> PTR%d\n",
+		__func__, ptr_id(shadow_int), ptr_id(ctor_data));
+
+	return 0;
+}
+
+static void shadow_dtor(void *obj, void *shadow_data)
+{
+	pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
+		__func__, ptr_id(obj), ptr_id(shadow_data));
+}
+
+static int test_klp_shadow_vars_init(void)
+{
+	void *obj			= THIS_MODULE;
+	int id			= 0x1234;
+	size_t size		= sizeof(int *);
+	gfp_t gfp_flags		= GFP_KERNEL;
+
+	int var1, var2, var3, var4;
+	int **sv1, **sv2, **sv3, **sv4;
+
+	void *ret;
+
+	ptr_id(0);
+	ptr_id(&var1);
+	ptr_id(&var2);
+	ptr_id(&var3);
+	ptr_id(&var4);
+
+	/*
+	 * With an empty shadow variable hash table, expect not to find
+	 * any matches.
+	 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * Allocate a few shadow variables with different <obj> and <id>.
+	 */
+	sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
+	sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
+	sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
+
+	/*
+	 * Verify we can find our new shadow variables and that they point
+	 * to expected data.
+	 */
+	ret = shadow_get(obj, id);
+	if (ret == sv1 && *sv1 == &var1)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv1), ptr_id(*sv1));
+	ret = shadow_get(obj + 1, id);
+	if (ret == sv2 && *sv2 == &var2)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv2), ptr_id(*sv2));
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Allocate or get a few more, this time with the same <obj>, <id>.
+	 * The second invocation should return the same shadow var.
+	 */
+	sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	if (ret == sv4 && *sv4 == &var4)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv4), ptr_id(*sv4));
+
+	/*
+	 * Free the <obj=*, id> shadow variables and check that we can no
+	 * longer find them.
+	 */
+	shadow_free(obj, id, shadow_dtor);			/* sv1 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 1, id, shadow_dtor);			/* sv2 */
+	ret = shadow_get(obj + 1, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 2, id, shadow_dtor);			/* sv4 */
+	ret = shadow_get(obj + 2, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * We should still find an <id+1> variable.
+	 */
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Free all the <id+1> variables, too.
+	 */
+	shadow_free_all(id + 1, shadow_dtor);			/* sv3 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  shadow_get() got expected NULL result\n");
+
+
+	free_ptr_list();
+
+	return 0;
+}
+
+static void test_klp_shadow_vars_exit(void)
+{
+}
+
+module_init(test_klp_shadow_vars_init);
+module_init(test_klp_shadow_vars_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: shadow variables");
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..d92c63bde9b6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -15,6 +15,7 @@ TARGETS += intel_pstate
 TARGETS += ipc
 TARGETS += kcmp
 TARGETS += lib
+TARGETS += livepatch
 TARGETS += membarrier
 TARGETS += memfd
 TARGETS += memory-hotplug
diff --git a/tools/testing/selftests/livepatch/Makefile b/tools/testing/selftests/livepatch/Makefile
new file mode 100644
index 000000000000..af4aee79bebb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_GEN_PROGS := \
+	test-livepatch.sh \
+	test-callbacks.sh \
+	test-shadow-vars.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/livepatch/config b/tools/testing/selftests/livepatch/config
new file mode 100644
index 000000000000..0dd7700464a8
--- /dev/null
+++ b/tools/testing/selftests/livepatch/config
@@ -0,0 +1 @@
+CONFIG_TEST_LIVEPATCH=m
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
new file mode 100644
index 000000000000..7aaef80e9edb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -0,0 +1,196 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+# Shell functions for the rest of the scripts.
+
+MAX_RETRIES=600
+RETRY_INTERVAL=".1"	# seconds
+
+# die(msg) - game over, man
+#	msg - dying words
+function die() {
+	echo "ERROR: $1" >&2
+	exit 1
+}
+
+# set_dynamic_debug() - setup kernel dynamic debug
+#	TODO - push and pop this config?
+function set_dynamic_debug() {
+	cat << EOF > /sys/kernel/debug/dynamic_debug/control
+file kernel/livepatch/* +p
+func klp_try_switch_task -p
+EOF
+}
+
+# wait_for_transition(modname)
+#	modname - livepatch module name
+wait_for_transition() {
+	local mod="$1"; shift
+
+	# Wait for livepatch transition  ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/transition) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to complete transition for module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# load_mod(modname, params) - load a kernel module
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ ! -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to load module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		# Wait for livepatch in sysfs ...
+		local i=0
+		while [ ! -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to load module $mod (sysfs)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# load_failing_mod(modname, params) - load a kernel module, expect to fail
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_failing_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" == "" ]]; then
+		echo "$mod unexpectedly loaded" > /dev/kmsg
+		die "$mod unexpectedly loaded"
+	fi
+	echo "$ret" > /dev/kmsg
+}
+
+# unload_mod(modname) - unload a kernel module
+#	modname - module name to unload
+function unload_mod() {
+	local mod="$1"
+
+	# Wait for module reference count to clear ...
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/refcnt) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (refcnt)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	echo "% rmmod $mod" > /dev/kmsg
+	ret=$(rmmod "$mod" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (/sys/module)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch sysfs if applicable ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		local i=0
+		while [ -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to unload module $mod (/sys/livepatch)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# display_lp(modname) - disable a livepatch
+#	modname - module name to unload
+function disable_lp() {
+	local mod="$1"
+
+        echo "% echo 0 > /sys/kernel/livepatch/$mod/enabled" > /dev/kmsg
+        echo 0 > /sys/kernel/livepatch/"$mod"/enabled
+
+	# Wait for livepatch enable to clear ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/enabled) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to disable livepatch $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# set_pre_patch_ret(modname, pre_patch_ret)
+#	modname - module name to set
+#	pre_patch_ret - new pre_patch_ret value
+function set_pre_patch_ret {
+	local mod="$1"; shift
+        local ret="$1"
+
+        echo "% echo $1 > /sys/module/$mod/parameters/pre_patch_ret" > /dev/kmsg
+        echo "$1" > /sys/module/"$mod"/parameters/pre_patch_ret
+
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/parameters/pre_patch_ret) != "$1" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to set pre_patch_ret parameter for $mod module"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# filter_dmesg() - print a filtered dmesg
+#	TODO - better filter, out of order msgs, etc?
+function check_result {
+	local expect="$*"
+	local result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')
+
+	if [[ "$expect" == "$result" ]] ; then
+		echo "ok"
+	else
+		echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
+		die "livepatch kselftest(s) failed"
+	fi
+}
diff --git a/tools/testing/selftests/livepatch/test-callbacks.sh b/tools/testing/selftests/livepatch/test-callbacks.sh
new file mode 100755
index 000000000000..739d09bb3cff
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-callbacks.sh
@@ -0,0 +1,607 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_callbacks_demo
+MOD_LIVEPATCH2=test_klp_callbacks_demo2
+MOD_TARGET=test_klp_callbacks_mod
+MOD_TARGET_BUSY=test_klp_callbacks_busy
+
+set_dynamic_debug
+
+
+# TEST: target module before livepatch
+#
+# Test a combination of loading a kernel module and a livepatch that
+# patches a function in the first module.  Load the target module
+# before the livepatch module.  Unload them in the same order.
+#
+# - On livepatch enable, before the livepatch transition starts,
+#   pre-patch callbacks are executed for vmlinux and $MOD_TARGET (those
+#   klp_objects currently loaded).  After klp_objects are patched
+#   according to the klp_patch, their post-patch callbacks run and the
+#   transition completes.
+#
+# - Similarly, on livepatch disable, pre-patch callbacks run before the
+#   unpatching transition starts.  klp_objects are reverted, post-patch
+#   callbacks execute and the transition completes.
+
+echo -n "TEST: target module before livepatch ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming notifier
+#
+# This test is similar to the previous test, but (un)load the livepatch
+# module before the target kernel module.  This tests the livepatch
+# core's module_coming handler.
+#
+# - On livepatch enable, only pre/post-patch callbacks are executed for
+#   currently loaded klp_objects, in this case, vmlinux.
+#
+# - When a targeted module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - On livepatch disable, all currently loaded klp_objects' (vmlinux and
+#   $MOD_TARGET) pre/post-unpatch callbacks are executed.
+
+echo -n "TEST: module_coming notifier ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_going notifier
+#
+# Test loading the livepatch after a targeted kernel module, then unload
+# the kernel module before disabling the livepatch.  This tests the
+# livepatch core's module_going handler.
+#
+# - First load a target module, then the livepatch.
+#
+# - When a target module is unloaded, the livepatch is only reverted
+#   from that klp_object ($MOD_TARGET).  As such, only its pre and
+#   post-unpatch callbacks are executed when this occurs.
+#
+# - When the livepatch is disabled, pre and post-unpatch callbacks are
+#   run for the remaining klp_object, vmlinux.
+
+echo -n "TEST: module_going notifier ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: module_coming and module_going notifiers
+#
+# This test is similar to the previous test, however the livepatch is
+# loaded first.  This tests the livepatch core's module_coming and
+# module_going handlers.
+#
+# - First load the livepatch.
+#
+# - When a targeted kernel module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - When the target module is unloaded, the livepatch is only reverted
+#   from the $MOD_TARGET klp_object.  As such, only pre and
+#   post-unpatch callbacks are executed when this occurs.
+
+echo -n "TEST: module_coming and module_going notifiers ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: target module not present
+#
+# A simple test of loading a livepatch without one of its patch target
+# klp_objects ever loaded ($MOD_TARGET).
+#
+# - Load the livepatch.
+#
+# - As expected, only pre/post-(un)patch handlers are executed for
+#   vmlinux.
+
+echo -n "TEST: target module not present ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: pre-patch callback -ENODEV
+#
+# Test a scenario where a vmlinux pre-patch callback returns a non-zero
+# status (ie, failure).
+#
+# - First load a target module.
+#
+# - Load the livepatch module, setting its 'pre_patch_ret' value to -19
+#   (-ENODEV).  When its vmlinux pre-patch callback executes, this
+#   status code will propagate back to the module-loading subsystem.
+#   The result is that the insmod command refuses to load the livepatch
+#   module.
+
+echo -n "TEST: pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_failing_mod $MOD_LIVEPATCH pre_patch_ret=-19
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH pre_patch_ret=-19
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: failed to enable patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+modprobe: ERROR: could not insert '$MOD_LIVEPATCH': No such device
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming + pre-patch callback -ENODEV
+#
+# Similar to the previous test, setup a livepatch such that its vmlinux
+# pre-patch callback returns success.  However, when a targeted kernel
+# module is later loaded, have the livepatch return a failing status
+# code.
+#
+# - Load the livepatch, vmlinux pre-patch callback succeeds.
+#
+# - Set a trap so subsequent pre-patch callbacks to this livepatch will
+#   return -ENODEV.
+#
+# - The livepatch pre-patch callback for subsequently loaded target
+#   modules will return failure, so the module loader refuses to load
+#   the kernel module.  No post-patch or pre/post-unpatch callbacks are
+#   executed for this klp_object.
+#
+# - Pre/post-unpatch callbacks are run for the vmlinux klp_object.
+
+echo -n "TEST: module_coming + pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+set_pre_patch_ret $MOD_LIVEPATCH -19
+load_failing_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: patch '$MOD_LIVEPATCH' failed for module '$MOD_TARGET', refusing to load module '$MOD_TARGET'
+modprobe: ERROR: could not insert '$MOD_TARGET': No such device
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple target modules
+#
+# Test loading multiple targeted kernel modules.  This test-case is
+# mainly for comparing with the next test-case.
+#
+# - Load a target "busy" kernel module which kicks off a worker function
+#   that immediately exits.
+#
+# - Proceed with loading the livepatch and another ordinary target
+#   module.  Post-patch callbacks are executed and the transition
+#   completes quickly.
+
+echo -n "TEST: multiple target modules ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=0
+# give $MOD_TARGET_BUSY::busymod_work_func() a chance to run
+sleep 5
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=0
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 0 seconds ...
+$MOD_TARGET_BUSY: busymod_work_func exit
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+
+# TEST: busy target module
+#
+# A similar test as the previous one, but force the "busy" kernel module
+# to do longer work.
+#
+# The livepatching core will refuse to patch a task that is currently
+# executing a to-be-patched function -- the consistency model stalls the
+# current patch transition until this safety-check is met.  Test a
+# scenario where one of a livepatch's target klp_objects sits on such a
+# function for a long time.  Meanwhile, load and unload other target
+# kernel modules while the livepatch transition is in progress.
+#
+# - Load the "busy" kernel module, this time make it do 10 seconds worth
+#   of work.
+#
+# - Meanwhile, the livepatch is loaded.  Notice that the patch
+#   transition does not complete as the targeted "busy" module is
+#   sitting on a to-be-patched function.
+#
+# - Load a second target module (this one is an ordinary idle kernel
+#   module).  Note that *no* post-patch callbacks will be executed while
+#   the livepatch is still in transition.
+#
+# - Request an unload of the simple kernel module.  The patch is still
+#   transitioning, so its pre-unpatch callbacks are skipped.
+#
+# - Finally the livepatch is disabled.  Since none of the patch's
+#   klp_object's post-patch callbacks executed, the remaining
+#   klp_object's pre-unpatch callbacks are skipped.
+
+echo -n "TEST: busy target module ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=10
+load_mod $MOD_LIVEPATCH
+# Don't wait for transition, load $MOD_TARGET while the transition
+# is still stalled in $MOD_TARGET_BUSY::busymod_work_func()
+sleep 5
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=10
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 10 seconds ...
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': reversing transition from patching to unpatching
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: busymod_work_func exit
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+# TEST: multiple livepatches
+#
+# Test loading multiple livepatches.  This test-case is mainly for comparing
+# with the next test-case.
+#
+# - Load and unload two livepatches, pre and post (un)patch callbacks
+#   execute as each patch progresses through its (un)patching
+#   transition.
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace
+#
+# Load multiple livepatches, but the second as an 'atomic-replace'
+# patch.  When the latter laods, the original livepatch should be
+# disabled and *none* of its pre/post-unpatch callbacks executed.  On
+# the other hand, when the atomic-replace livepatch is disabled, its
+# pre/post-unpatch callbacks *should* be executed.
+#
+# - Load and unload two livepatches, the second of which has its
+#   .replace flag set true.
+#
+# - Pre and post patch callbacks are executed for both livepatches.
+#
+# - Once the atomic replace module is loaded, only its pre and post
+#   unpatch callbacks are executed.
+
+echo -n "TEST: atomic replace ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2 replace=1
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2 replace=1
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-livepatch.sh b/tools/testing/selftests/livepatch/test-livepatch.sh
new file mode 100755
index 000000000000..3e4b8072da84
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-livepatch.sh
@@ -0,0 +1,173 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_livepatch
+MOD_REPLACE=test_klp_atomic_replace
+
+set_dynamic_debug
+
+
+# TEST: basic function patching
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - unload the livepatch and make sure the patch was removed
+
+echo -n "TEST: basic function patching ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple livepatches
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load another livepatch and verify that both livepatches are active
+# - unload the second livepatch and verify that the first is still active
+# - unload the first livepatch and verify none are active
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=0
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=0
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_LIVEPATCH: this has been live patched
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE
+$MOD_LIVEPATCH: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace livepatch
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load an atomic replace livepatch and verify that only the second is active
+# - remove the first livepatch and verify that the atomic replace livepatch
+#   is still active
+# - remove the atomic replace livepatch and verify that none are active
+
+echo -n "TEST: atomic replace livepatch ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=1
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=1
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_REPLACE: this has been live patched
+% rmmod $MOD_LIVEPATCH
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-shadow-vars.sh b/tools/testing/selftests/livepatch/test-shadow-vars.sh
new file mode 100755
index 000000000000..96390a21b15d
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-shadow-vars.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_TEST=test_klp_shadow_vars
+
+set_dynamic_debug
+
+
+# TEST: basic shadow variable API
+# - load a module that exercises the shadow variable API
+
+echo -n "TEST: basic shadow variable API ... "
+dmesg -C
+
+load_mod $MOD_TEST
+unload_mod $MOD_TEST
+
+check_result "% modprobe $MOD_TEST
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_ctor: PTR6 -> PTR1
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
+$MOD_TEST: shadow_ctor: PTR8 -> PTR2
+$MOD_TEST: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
+$MOD_TEST: shadow_ctor: PTR10 -> PTR3
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
+$MOD_TEST:   got expected PTR6 -> PTR1 result
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
+$MOD_TEST:   got expected PTR8 -> PTR2 result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_ctor: PTR11 -> PTR4
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST:   got expected PTR11 -> PTR4 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR6)
+$MOD_TEST: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR9, shadow_data=PTR8)
+$MOD_TEST: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR12, shadow_data=PTR11)
+$MOD_TEST: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR10)
+$MOD_TEST: klp_shadow_free_all(id=0x1235, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   shadow_get() got expected NULL result
+% rmmod test_klp_shadow_vars"
+
+exit 0
-- 
1.8.3.1

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[PATCH v2] selftests/livepatch: introduce tests

[joe.lawrence]

Add a few livepatch modules and simple target modules that the included
regression suite can run tests against.

Signed-off-by: Joe Lawrence <joe.lawrence at redhat.com>
---
 Documentation/livepatch/callbacks.txt              | 487 -----------------
 lib/Kconfig.debug                                  |  12 +
 lib/Makefile                                       |   2 +
 lib/livepatch/Makefile                             |  15 +
 lib/livepatch/test_klp_atomic_replace.c            |  69 +++
 lib/livepatch/test_klp_callbacks_busy.c            |  43 ++
 lib/livepatch/test_klp_callbacks_demo.c            | 132 +++++
 lib/livepatch/test_klp_callbacks_demo2.c           | 104 ++++
 lib/livepatch/test_klp_callbacks_mod.c             |  24 +
 lib/livepatch/test_klp_livepatch.c                 |  62 +++
 lib/livepatch/test_klp_shadow_vars.c               | 235 ++++++++
 tools/testing/selftests/Makefile                   |   1 +
 tools/testing/selftests/livepatch/Makefile         |   8 +
 tools/testing/selftests/livepatch/config           |   1 +
 tools/testing/selftests/livepatch/functions.sh     | 196 +++++++
 .../testing/selftests/livepatch/test-callbacks.sh  | 607 +++++++++++++++++++++
 .../testing/selftests/livepatch/test-livepatch.sh  | 173 ++++++
 .../selftests/livepatch/test-shadow-vars.sh        |  60 ++
 18 files changed, 1744 insertions(+), 487 deletions(-)
 create mode 100644 lib/livepatch/Makefile
 create mode 100644 lib/livepatch/test_klp_atomic_replace.c
 create mode 100644 lib/livepatch/test_klp_callbacks_busy.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo.c
 create mode 100644 lib/livepatch/test_klp_callbacks_demo2.c
 create mode 100644 lib/livepatch/test_klp_callbacks_mod.c
 create mode 100644 lib/livepatch/test_klp_livepatch.c
 create mode 100644 lib/livepatch/test_klp_shadow_vars.c
 create mode 100644 tools/testing/selftests/livepatch/Makefile
 create mode 100644 tools/testing/selftests/livepatch/config
 create mode 100644 tools/testing/selftests/livepatch/functions.sh
 create mode 100755 tools/testing/selftests/livepatch/test-callbacks.sh
 create mode 100755 tools/testing/selftests/livepatch/test-livepatch.sh
 create mode 100755 tools/testing/selftests/livepatch/test-shadow-vars.sh

diff --git a/Documentation/livepatch/callbacks.txt b/Documentation/livepatch/callbacks.txt
index c9776f48e458..6ca2801a6bb9 100644
--- a/Documentation/livepatch/callbacks.txt
+++ b/Documentation/livepatch/callbacks.txt
@@ -116,490 +116,3 @@ virtnet_probe() initialized its driver's net_device features.  A
 pre/post-patch callback could iterate over all such devices, making a
 similar change to their hw_features value.  (Client functions of the
 value may need to be updated accordingly.)
-
-
-Test cases
-==========
-
-What follows is not an exhaustive test suite of every possible livepatch
-pre/post-(un)patch combination, but a selection that demonstrates a few
-important concepts.  Each test case uses the kernel modules located in
-the samples/livepatch/ and assumes that no livepatches are loaded at the
-beginning of the test.
-
-
-Test 1
-------
-
-Test a combination of loading a kernel module and a livepatch that
-patches a function in the first module.  (Un)load the target module
-before the livepatch module:
-
-- load target module
-- load livepatch
-- disable livepatch
-- unload target module
-- unload livepatch
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   34.475708] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch enable, before the livepatch transition starts, pre-patch
-callbacks are executed for vmlinux and livepatch_callbacks_mod (those
-klp_objects currently loaded).  After klp_objects are patched according
-to the klp_patch, their post-patch callbacks run and the transition
-completes:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   36.503719] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   36.504213] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   36.504238] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   36.504721] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   36.505849] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   37.727133] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   37.727232] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   37.727860] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   37.728792] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Similarly, on livepatch disable, pre-patch callbacks run before the
-unpatching transition starts.  klp_objects are reverted, post-patch
-callbacks execute and the transition completes:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   38.510209] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   38.510234] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   38.510982] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   38.512209] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   39.711132] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   39.711210] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   39.711779] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   39.712735] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   42.534183] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 2
-------
-
-This test is similar to the previous test, but (un)load the livepatch
-module before the target kernel module.  This tests the livepatch core's
-module_coming handler:
-
-- load livepatch
-- load target module
-- disable livepatch
-- unload livepatch
-- unload target module
-
-
-On livepatch enable, only pre/post-patch callbacks are executed for
-currently loaded klp_objects, in this case, vmlinux:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   44.553328] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   44.553997] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   44.554049] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   44.554845] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   45.727128] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   45.727212] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   45.727961] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted module is subsequently loaded, only its pre/post-patch
-callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   46.560845] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   46.561988] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.563452] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   46.565495] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-On livepatch disable, all currently loaded klp_objects' (vmlinux and
-livepatch_callbacks_mod) pre/post-unpatch callbacks are executed:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   48.568885] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   48.568910] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   48.569441] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   48.570502] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   49.759091] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   49.759171] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   49.759742] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   49.760690] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   52.592283] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 3
-------
-
-Test loading the livepatch after a targeted kernel module, then unload
-the kernel module before disabling the livepatch.  This tests the
-livepatch core's module_going handler:
-
-- load target module
-- load livepatch
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load a target module, then the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   54.607948] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   56.613919] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   56.614411] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   56.614436] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   56.614818] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   56.615656] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   57.759070] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   57.759147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   57.759621] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_LIVE] Normal state
-  [   57.760307] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a target module is unloaded, the livepatch is only reverted from
-that klp_object (livepatch_callbacks_mod).  As such, only its pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   58.623409] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   58.623903] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   58.624658] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   58.625305] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-When the livepatch is disabled, pre and post-unpatch callbacks are run
-for the remaining klp_object, vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   60.638420] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   60.638444] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   60.638996] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   61.727088] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   61.727165] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   61.727985] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 4
-------
-
-This test is similar to the previous test, however the livepatch is
-loaded first.  This tests the livepatch core's module_coming and
-module_going handlers:
-
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-
-First load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   64.661552] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   64.662147] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   64.662175] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   64.662850] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   65.695056] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   65.695147] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   65.695561] livepatch: 'livepatch_callbacks_demo': patching complete
-
-When a targeted kernel module is subsequently loaded, only its
-pre/post-patch callbacks are executed:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   66.669196] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   66.669882] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.670744] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   66.672873] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-When the target module is unloaded, the livepatch is only reverted from
-the livepatch_callbacks_mod klp_object.  As such, only pre and
-post-unpatch callbacks are executed when this occurs:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   68.680065] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [   68.680688] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [   68.681452] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [   68.682094] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   70.689225] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   70.689256] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   70.689882] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   71.711080] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   71.711481] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   71.711988] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 5
-------
-
-A simple test of loading a livepatch without one of its patch target
-klp_objects ever loaded (livepatch_callbacks_mod):
-
-- load livepatch
-- disable livepatch
-- unload livepatch
-
-Load the livepatch:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   74.711081] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   74.711595] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   74.711639] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   74.712272] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   75.743137] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   75.743219] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   75.743867] livepatch: 'livepatch_callbacks_demo': patching complete
-
-As expected, only pre/post-(un)patch handlers are executed for vmlinux:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   76.716254] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   76.716278] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   76.716666] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   77.727089] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   77.727194] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   77.727907] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 6
-------
-
-Test a scenario where a vmlinux pre-patch callback returns a non-zero
-status (ie, failure):
-
-- load target module
-- load livepatch -ENODEV
-- unload target module
-
-First load a target module:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   80.740520] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Load the livepatch module, setting its 'pre_patch_ret' value to -19
-(-ENODEV).  When its vmlinux pre-patch callback executed, this status
-code will propagate back to the module-loading subsystem.  The result is
-that the insmod command refuses to load the livepatch module:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko pre_patch_ret=-19
-  [   82.747326] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   82.747743] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   82.747767] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   82.748237] livepatch: pre-patch callback failed for object 'vmlinux'
-  [   82.748637] livepatch: failed to enable patch 'livepatch_callbacks_demo'
-  [   82.749059] livepatch: 'livepatch_callbacks_demo': canceling transition, going to unpatch
-  [   82.749060] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   82.749868] livepatch: 'livepatch_callbacks_demo': unpatching complete
-  [   82.765809] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-demo.ko: No such device
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   84.774238] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-
-
-Test 7
-------
-
-Similar to the previous test, setup a livepatch such that its vmlinux
-pre-patch callback returns success.  However, when a targeted kernel
-module is later loaded, have the livepatch return a failing status code:
-
-- load livepatch
-- setup -ENODEV
-- load target module
-- disable livepatch
-- unload livepatch
-
-Load the livepatch, notice vmlinux pre-patch callback succeeds:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   86.787845] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   86.788325] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   86.788427] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   86.788821] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   87.711069] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   87.711143] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   87.711886] livepatch: 'livepatch_callbacks_demo': patching complete
-
-Set a trap so subsequent pre-patch callbacks to this livepatch will
-return -ENODEV:
-
-  % echo -19 > /sys/module/livepatch_callbacks_demo/parameters/pre_patch_ret
-
-The livepatch pre-patch callback for subsequently loaded target modules
-will return failure, so the module loader refuses to load the kernel
-module.  Notice that no post-patch or pre/post-unpatch callbacks are
-executed for this klp_object:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [   90.796976] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [   90.797834] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [   90.798900] livepatch: pre-patch callback failed for object 'livepatch_callbacks_mod'
-  [   90.799652] livepatch: patch 'livepatch_callbacks_demo' failed for module 'livepatch_callbacks_mod', refusing to load module 'livepatch_callbacks_mod'
-  [   90.819737] insmod: ERROR: could not insert module samples/livepatch/livepatch-callbacks-mod.ko: No such device
-
-However, pre/post-unpatch callbacks run for the vmlinux klp_object:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [   92.823547] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [   92.823573] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [   92.824331] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [   93.727128] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [   93.727327] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [   93.727861] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-
-
-Test 8
-------
-
-Test loading multiple targeted kernel modules.  This test-case is
-mainly for comparing with the next test-case.
-
-- load busy target module (0s sleep),
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load a target "busy" kernel module which kicks off a worker function
-that immediately exits:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=0
-  [   96.910107] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [   96.910600] livepatch_callbacks_busymod: busymod_work_func, sleeping 0 seconds ...
-  [   96.913024] livepatch_callbacks_busymod: busymod_work_func exit
-
-Proceed with loading the livepatch and another ordinary target module,
-notice that the post-patch callbacks are executed and the transition
-completes quickly:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [   98.917892] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [   98.918426] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [   98.918453] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [   98.918955] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   98.923835] livepatch: 'livepatch_callbacks_demo': starting patching transition
-  [   99.743104] livepatch: 'livepatch_callbacks_demo': completing patching transition
-  [   99.743156] livepatch_callbacks_demo: post_patch_callback: vmlinux
-  [   99.743679] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [   99.744616] livepatch: 'livepatch_callbacks_demo': patching complete
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  100.930955] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  100.931668] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.932645] livepatch_callbacks_demo: post_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  100.934125] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  102.942805] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  102.943640] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-  [  102.944585] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  102.945455] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  104.953815] livepatch: 'livepatch_callbacks_demo': initializing unpatching transition
-  [  104.953838] livepatch_callbacks_demo: pre_unpatch_callback: vmlinux
-  [  104.954431] livepatch_callbacks_demo: pre_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  104.955426] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  106.719073] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  106.722633] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  106.723282] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  106.724279] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  108.975660] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
-
-
-Test 9
-------
-
-A similar test as the previous one, but force the "busy" kernel module
-to do longer work.
-
-The livepatching core will refuse to patch a task that is currently
-executing a to-be-patched function -- the consistency model stalls the
-current patch transition until this safety-check is met.  Test a
-scenario where one of a livepatch's target klp_objects sits on such a
-function for a long time.  Meanwhile, load and unload other target
-kernel modules while the livepatch transition is in progress.
-
-- load busy target module (30s sleep)
-- load livepatch
-- load target module
-- unload target module
-- disable livepatch
-- unload livepatch
-- unload busy target module
-
-
-Load the "busy" kernel module, this time make it do 30 seconds worth of
-work:
-
-  % insmod samples/livepatch/livepatch-callbacks-busymod.ko sleep_secs=30
-  [  110.993362] livepatch_callbacks_busymod: livepatch_callbacks_mod_init
-  [  110.994059] livepatch_callbacks_busymod: busymod_work_func, sleeping 30 seconds ...
-
-Meanwhile, the livepatch is loaded.  Notice that the patch transition
-does not complete as the targeted "busy" module is sitting on a
-to-be-patched function:
-
-  % insmod samples/livepatch/livepatch-callbacks-demo.ko
-  [  113.000309] livepatch: enabling patch 'livepatch_callbacks_demo'
-  [  113.000764] livepatch: 'livepatch_callbacks_demo': initializing patching transition
-  [  113.000791] livepatch_callbacks_demo: pre_patch_callback: vmlinux
-  [  113.001289] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  113.005208] livepatch: 'livepatch_callbacks_demo': starting patching transition
-
-Load a second target module (this one is an ordinary idle kernel
-module).  Note that *no* post-patch callbacks will be executed while the
-livepatch is still in transition:
-
-  % insmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  115.012740] livepatch: applying patch 'livepatch_callbacks_demo' to loading module 'livepatch_callbacks_mod'
-  [  115.013406] livepatch_callbacks_demo: pre_patch_callback: livepatch_callbacks_mod -> [MODULE_STATE_COMING] Full formed, running module_init
-  [  115.015315] livepatch_callbacks_mod: livepatch_callbacks_mod_init
-
-Request an unload of the simple kernel module.  The patch is still
-transitioning, so its pre-unpatch callbacks are skipped:
-
-  % rmmod samples/livepatch/livepatch-callbacks-mod.ko
-  [  117.022626] livepatch_callbacks_mod: livepatch_callbacks_mod_exit
-  [  117.023376] livepatch: reverting patch 'livepatch_callbacks_demo' on unloading module 'livepatch_callbacks_mod'
-  [  117.024533] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_mod -> [MODULE_STATE_GOING] Going away
-
-Finally the livepatch is disabled.  Since none of the patch's
-klp_object's post-patch callbacks executed, the remaining klp_object's
-pre-unpatch callbacks are skipped:
-
-  % echo 0 > /sys/kernel/livepatch/livepatch_callbacks_demo/enabled
-  [  119.035408] livepatch: 'livepatch_callbacks_demo': reversing transition from patching to unpatching
-  [  119.035485] livepatch: 'livepatch_callbacks_demo': starting unpatching transition
-  [  119.711166] livepatch: 'livepatch_callbacks_demo': completing unpatching transition
-  [  119.714179] livepatch_callbacks_demo: post_unpatch_callback: vmlinux
-  [  119.714653] livepatch_callbacks_demo: post_unpatch_callback: livepatch_callbacks_busymod -> [MODULE_STATE_LIVE] Normal state
-  [  119.715437] livepatch: 'livepatch_callbacks_demo': unpatching complete
-
-  % rmmod samples/livepatch/livepatch-callbacks-demo.ko
-  % rmmod samples/livepatch/livepatch-callbacks-busymod.ko
-  [  141.279111] livepatch_callbacks_busymod: busymod_work_func exit
-  [  141.279760] livepatch_callbacks_busymod: livepatch_callbacks_mod_exit
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 64155e310a9f..e4a0e81542ff 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1932,6 +1932,18 @@ config TEST_DEBUG_VIRTUAL
 
 	  If unsure, say N.
 
+config TEST_LIVEPATCH
+	tristate "Test livepatching"
+	default n
+	depends on LIVEPATCH
+	depends on m
+	help
+	  Test various kernel livepatching features for correctness.
+	  The tests will load test modules that will be livepatched
+	  in various scenarios.
+
+	  If unsure, say N.
+
 endif # RUNTIME_TESTING_MENU
 
 config MEMTEST
diff --git a/lib/Makefile b/lib/Makefile
index a90d4fcd748f..98a38441afb0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -67,6 +67,8 @@ obj-$(CONFIG_TEST_PARMAN) += test_parman.o
 obj-$(CONFIG_TEST_KMOD) += test_kmod.o
 obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
 
+obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
+
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG
 CFLAGS_kobject_uevent.o += -DDEBUG
diff --git a/lib/livepatch/Makefile b/lib/livepatch/Makefile
new file mode 100644
index 000000000000..26900ddaef82
--- /dev/null
+++ b/lib/livepatch/Makefile
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for livepatch test code.
+
+obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
+				test_klp_callbacks_demo.o \
+				test_klp_callbacks_demo2.o \
+				test_klp_callbacks_busy.o \
+				test_klp_callbacks_mod.o \
+				test_klp_livepatch.o \
+				test_klp_shadow_vars.o
+
+# Target modules to be livepatched require CC_FLAGS_FTRACE
+CFLAGS_test_klp_callbacks_busy.o	+= $(CC_FLAGS_FTRACE)
+CFLAGS_test_klp_callbacks_mod.o		+= $(CC_FLAGS_FTRACE)
diff --git a/lib/livepatch/test_klp_atomic_replace.c b/lib/livepatch/test_klp_atomic_replace.c
new file mode 100644
index 000000000000..d1bcf6b0cfb3
--- /dev/null
+++ b/lib/livepatch/test_klp_atomic_replace.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+#include <linux/seq_file.h>
+static int livepatch_meminfo_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "meminfo_proc_show",
+		.new_func = livepatch_meminfo_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+	/* set .replace in the init function below for demo purposes */
+};
+
+static int test_klp_atomic_replace_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_atomic_replace_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_atomic_replace_init);
+module_exit(test_klp_atomic_replace_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: atomic replace");
diff --git a/lib/livepatch/test_klp_callbacks_busy.c b/lib/livepatch/test_klp_callbacks_busy.c
new file mode 100644
index 000000000000..40beddf8a0e2
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_busy.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+
+static int sleep_secs;
+module_param(sleep_secs, int, 0644);
+MODULE_PARM_DESC(sleep_secs, "sleep_secs (default=0)");
+
+static void busymod_work_func(struct work_struct *work);
+static DECLARE_DELAYED_WORK(work, busymod_work_func);
+
+static void busymod_work_func(struct work_struct *work)
+{
+	pr_info("%s, sleeping %d seconds ...\n", __func__, sleep_secs);
+	msleep(sleep_secs * 1000);
+	pr_info("%s exit\n", __func__);
+}
+
+static int test_klp_callbacks_busy_init(void)
+{
+	pr_info("%s\n", __func__);
+	schedule_delayed_work(&work,
+		msecs_to_jiffies(1000 * 0));
+	return 0;
+}
+
+static void test_klp_callbacks_busy_exit(void)
+{
+	cancel_delayed_work_sync(&work);
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_busy_init);
+module_exit(test_klp_callbacks_busy_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: busy target module");
diff --git a/lib/livepatch/test_klp_callbacks_demo.c b/lib/livepatch/test_klp_callbacks_demo.c
new file mode 100644
index 000000000000..87fc61445c5f
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int pre_patch_ret;
+module_param(pre_patch_ret, int, 0644);
+MODULE_PARM_DESC(pre_patch_ret, "pre_patch_ret (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return pre_patch_ret;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static void patched_work_func(struct work_struct *work)
+{
+	pr_info("%s\n", __func__);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_func busymod_funcs[] = {
+	{
+		.old_name = "busymod_work_func",
+		.new_func = patched_work_func,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_mod",
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	},	{
+		.name = "test_klp_callbacks_busy",
+		.funcs = busymod_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo_init);
+module_exit(test_klp_callbacks_demo_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo");
diff --git a/lib/livepatch/test_klp_callbacks_demo2.c b/lib/livepatch/test_klp_callbacks_demo2.c
new file mode 100644
index 000000000000..c2a6c7b40424
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_demo2.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+static int replace;
+module_param(replace, int, 0644);
+MODULE_PARM_DESC(replace, "replace (default=0)");
+
+static const char *const module_state[] = {
+	[MODULE_STATE_LIVE]	= "[MODULE_STATE_LIVE] Normal state",
+	[MODULE_STATE_COMING]	= "[MODULE_STATE_COMING] Full formed, running module_init",
+	[MODULE_STATE_GOING]	= "[MODULE_STATE_GOING] Going away",
+	[MODULE_STATE_UNFORMED]	= "[MODULE_STATE_UNFORMED] Still setting it up",
+};
+
+static void callback_info(const char *callback, struct klp_object *obj)
+{
+	if (obj->mod)
+		pr_info("%s: %s -> %s\n", callback, obj->mod->name,
+			module_state[obj->mod->state]);
+	else
+		pr_info("%s: vmlinux\n", callback);
+}
+
+/* Executed on object patching (ie, patch enablement) */
+static int pre_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+	return 0;
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_patch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void pre_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+/* Executed on object unpatching (ie, patch disablement) */
+static void post_unpatch_callback(struct klp_object *obj)
+{
+	callback_info(__func__, obj);
+}
+
+static struct klp_func no_funcs[] = {
+	{ }
+};
+
+static struct klp_object objs[] = {
+	{
+		.name = NULL,	/* vmlinux */
+		.funcs = no_funcs,
+		.callbacks = {
+			.pre_patch = pre_patch_callback,
+			.post_patch = post_patch_callback,
+			.pre_unpatch = pre_unpatch_callback,
+			.post_unpatch = post_unpatch_callback,
+		},
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_callbacks_demo2_init(void)
+{
+	int ret;
+
+	patch.replace = replace;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_callbacks_demo2_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_callbacks_demo2_init);
+module_exit(test_klp_callbacks_demo2_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch demo2");
diff --git a/lib/livepatch/test_klp_callbacks_mod.c b/lib/livepatch/test_klp_callbacks_mod.c
new file mode 100644
index 000000000000..8fbe645b1c2c
--- /dev/null
+++ b/lib/livepatch/test_klp_callbacks_mod.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+static int test_klp_callbacks_mod_init(void)
+{
+	pr_info("%s\n", __func__);
+	return 0;
+}
+
+static void test_klp_callbacks_mod_exit(void)
+{
+	pr_info("%s\n", __func__);
+}
+
+module_init(test_klp_callbacks_mod_init);
+module_exit(test_klp_callbacks_mod_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: target module");
diff --git a/lib/livepatch/test_klp_livepatch.c b/lib/livepatch/test_klp_livepatch.c
new file mode 100644
index 000000000000..4014754c8da8
--- /dev/null
+++ b/lib/livepatch/test_klp_livepatch.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2014 Seth Jennings <sjenning at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/livepatch.h>
+
+#include <linux/seq_file.h>
+static int livepatch_cmdline_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "%s: %s\n", THIS_MODULE->name,
+		   "this has been live patched");
+	return 0;
+}
+
+static struct klp_func funcs[] = {
+	{
+		.old_name = "cmdline_proc_show",
+		.new_func = livepatch_cmdline_proc_show,
+	}, { }
+};
+
+static struct klp_object objs[] = {
+	{
+		/* name being NULL means vmlinux */
+		.funcs = funcs,
+	}, { }
+};
+
+static struct klp_patch patch = {
+	.mod = THIS_MODULE,
+	.objs = objs,
+};
+
+static int test_klp_livepatch_init(void)
+{
+	int ret;
+
+	ret = klp_register_patch(&patch);
+	if (ret)
+		return ret;
+	ret = klp_enable_patch(&patch);
+	if (ret) {
+		WARN_ON(klp_unregister_patch(&patch));
+		return ret;
+	}
+	return 0;
+}
+
+static void test_klp_livepatch_exit(void)
+{
+	WARN_ON(klp_unregister_patch(&patch));
+}
+
+module_init(test_klp_livepatch_init);
+module_exit(test_klp_livepatch_exit);
+MODULE_LICENSE("GPL");
+MODULE_INFO(livepatch, "Y");
+MODULE_AUTHOR("Seth Jennings <sjenning at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: livepatch module");
diff --git a/lib/livepatch/test_klp_shadow_vars.c b/lib/livepatch/test_klp_shadow_vars.c
new file mode 100644
index 000000000000..05f45747c081
--- /dev/null
+++ b/lib/livepatch/test_klp_shadow_vars.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/livepatch.h>
+#include <linux/slab.h>
+
+/*
+ * Keep a small list of pointers so that we can print address-agnostic
+ * pointer values.  Use a rolling integer count to differentiate the values.
+ * Ironically we could have used the shadow variable API to do this, but
+ * let's not lean too heavily on the very code we're testing.
+ */
+static LIST_HEAD(ptr_list);
+struct shadow_ptr {
+	void *ptr;
+	int id;
+	struct list_head list;
+};
+
+void free_ptr_list(void)
+{
+	struct shadow_ptr *sp, *tmp_sp;
+
+	list_for_each_entry_safe(sp, tmp_sp, &ptr_list, list) {
+		list_del(&sp->list);
+		kfree(sp);
+	}
+}
+
+int ptr_id(void *ptr)
+{
+	struct shadow_ptr *sp;
+	static int count;
+
+	list_for_each_entry(sp, &ptr_list, list) {
+		if (sp->ptr == ptr)
+			return sp->id;
+	}
+
+	sp = kmalloc(sizeof(*sp), GFP_KERNEL);
+	if (!sp)
+		return -1;
+	sp->ptr = ptr;
+	sp->id = count++;
+
+	list_add(&sp->list, &ptr_list);
+
+	return sp->id;
+}
+
+/*
+ * Shadow variable wrapper functions that echo the function and arguments
+ * to the kernel log for testing verification.  Don't display raw pointers,
+ * but use the ptr_id() value instead.
+ */
+void *shadow_get(void *obj, unsigned long id)
+{
+	void *ret = klp_shadow_get(obj, id);
+
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx) = PTR%d\n",
+		__func__, ptr_id(obj), id, ptr_id(ret));
+
+	return ret;
+}
+
+void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags,
+		   klp_shadow_ctor_t ctor, void *ctor_data)
+{
+	void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
+				     ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
+			  gfp_t gfp_flags, klp_shadow_ctor_t ctor,
+			  void *ctor_data)
+{
+	void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
+					    ctor_data);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
+		__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
+		ptr_id(ctor_data), ptr_id(ret));
+	return ret;
+}
+
+void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free(obj, id, dtor);
+	pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
+		__func__, ptr_id(obj), id, ptr_id(dtor));
+}
+
+void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
+{
+	klp_shadow_free_all(id, dtor);
+	pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n",
+		__func__, id, ptr_id(dtor));
+}
+
+
+/* Shadow variable constructor - remember simple pointer data */
+static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
+{
+	int **shadow_int = shadow_data;
+	*shadow_int = ctor_data;
+	pr_info("%s: PTR%d -> PTR%d\n",
+		__func__, ptr_id(shadow_int), ptr_id(ctor_data));
+
+	return 0;
+}
+
+static void shadow_dtor(void *obj, void *shadow_data)
+{
+	pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
+		__func__, ptr_id(obj), ptr_id(shadow_data));
+}
+
+static int test_klp_shadow_vars_init(void)
+{
+	void *obj			= THIS_MODULE;
+	int id			= 0x1234;
+	size_t size		= sizeof(int *);
+	gfp_t gfp_flags		= GFP_KERNEL;
+
+	int var1, var2, var3, var4;
+	int **sv1, **sv2, **sv3, **sv4;
+
+	void *ret;
+
+	ptr_id(0);
+	ptr_id(&var1);
+	ptr_id(&var2);
+	ptr_id(&var3);
+	ptr_id(&var4);
+
+	/*
+	 * With an empty shadow variable hash table, expect not to find
+	 * any matches.
+	 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * Allocate a few shadow variables with different <obj> and <id>.
+	 */
+	sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
+	sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
+	sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
+
+	/*
+	 * Verify we can find our new shadow variables and that they point
+	 * to expected data.
+	 */
+	ret = shadow_get(obj, id);
+	if (ret == sv1 && *sv1 == &var1)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv1), ptr_id(*sv1));
+	ret = shadow_get(obj + 1, id);
+	if (ret == sv2 && *sv2 == &var2)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv2), ptr_id(*sv2));
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Allocate or get a few more, this time with the same <obj>, <id>.
+	 * The second invocation should return the same shadow var.
+	 */
+	sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
+	if (ret == sv4 && *sv4 == &var4)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv4), ptr_id(*sv4));
+
+	/*
+	 * Free the <obj=*, id> shadow variables and check that we can no
+	 * longer find them.
+	 */
+	shadow_free(obj, id, shadow_dtor);			/* sv1 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 1, id, shadow_dtor);			/* sv2 */
+	ret = shadow_get(obj + 1, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	shadow_free(obj + 2, id, shadow_dtor);			/* sv4 */
+	ret = shadow_get(obj + 2, id);
+	if (!ret)
+		pr_info("  got expected NULL result\n");
+
+	/*
+	 * We should still find an <id+1> variable.
+	 */
+	ret = shadow_get(obj, id + 1);
+	if (ret == sv3 && *sv3 == &var3)
+		pr_info("  got expected PTR%d -> PTR%d result\n",
+			ptr_id(sv3), ptr_id(*sv3));
+
+	/*
+	 * Free all the <id+1> variables, too.
+	 */
+	shadow_free_all(id + 1, shadow_dtor);			/* sv3 */
+	ret = shadow_get(obj, id);
+	if (!ret)
+		pr_info("  shadow_get() got expected NULL result\n");
+
+
+	free_ptr_list();
+
+	return 0;
+}
+
+static void test_klp_shadow_vars_exit(void)
+{
+}
+
+module_init(test_klp_shadow_vars_init);
+module_init(test_klp_shadow_vars_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Joe Lawrence <joe.lawrence at redhat.com>");
+MODULE_DESCRIPTION("Livepatch test: shadow variables");
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 7442dfb73b7f..d92c63bde9b6 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -15,6 +15,7 @@ TARGETS += intel_pstate
 TARGETS += ipc
 TARGETS += kcmp
 TARGETS += lib
+TARGETS += livepatch
 TARGETS += membarrier
 TARGETS += memfd
 TARGETS += memory-hotplug
diff --git a/tools/testing/selftests/livepatch/Makefile b/tools/testing/selftests/livepatch/Makefile
new file mode 100644
index 000000000000..af4aee79bebb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+
+TEST_GEN_PROGS := \
+	test-livepatch.sh \
+	test-callbacks.sh \
+	test-shadow-vars.sh
+
+include ../lib.mk
diff --git a/tools/testing/selftests/livepatch/config b/tools/testing/selftests/livepatch/config
new file mode 100644
index 000000000000..0dd7700464a8
--- /dev/null
+++ b/tools/testing/selftests/livepatch/config
@@ -0,0 +1 @@
+CONFIG_TEST_LIVEPATCH=m
diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing/selftests/livepatch/functions.sh
new file mode 100644
index 000000000000..7aaef80e9edb
--- /dev/null
+++ b/tools/testing/selftests/livepatch/functions.sh
@@ -0,0 +1,196 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+# Shell functions for the rest of the scripts.
+
+MAX_RETRIES=600
+RETRY_INTERVAL=".1"	# seconds
+
+# die(msg) - game over, man
+#	msg - dying words
+function die() {
+	echo "ERROR: $1" >&2
+	exit 1
+}
+
+# set_dynamic_debug() - setup kernel dynamic debug
+#	TODO - push and pop this config?
+function set_dynamic_debug() {
+	cat << EOF > /sys/kernel/debug/dynamic_debug/control
+file kernel/livepatch/* +p
+func klp_try_switch_task -p
+EOF
+}
+
+# wait_for_transition(modname)
+#	modname - livepatch module name
+wait_for_transition() {
+	local mod="$1"; shift
+
+	# Wait for livepatch transition  ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/transition) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to complete transition for module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# load_mod(modname, params) - load a kernel module
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ ! -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to load module $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		# Wait for livepatch in sysfs ...
+		local i=0
+		while [ ! -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to load module $mod (sysfs)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# load_failing_mod(modname, params) - load a kernel module, expect to fail
+#	modname - module name to load
+#       params  - module parameters to pass to modprobe
+function load_failing_mod() {
+	local mod="$1"; shift
+	local args="$*"
+
+	local msg="% modprobe $mod $args"
+	echo "${msg%% }" > /dev/kmsg
+	ret=$(modprobe "$mod" "$args" 2>&1)
+	if [[ "$ret" == "" ]]; then
+		echo "$mod unexpectedly loaded" > /dev/kmsg
+		die "$mod unexpectedly loaded"
+	fi
+	echo "$ret" > /dev/kmsg
+}
+
+# unload_mod(modname) - unload a kernel module
+#	modname - module name to unload
+function unload_mod() {
+	local mod="$1"
+
+	# Wait for module reference count to clear ...
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/refcnt) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (refcnt)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	echo "% rmmod $mod" > /dev/kmsg
+	ret=$(rmmod "$mod" 2>&1)
+	if [[ "$ret" != "" ]]; then
+		echo "$ret" > /dev/kmsg
+		die "$ret"
+	fi
+
+	# Wait for module in sysfs ...
+	local i=0
+	while [ -e /sys/module/"$mod" ]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to unload module $mod (/sys/module)"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+
+	# Wait for livepatch sysfs if applicable ...
+	if [[ $(modinfo "$mod" | awk '/^livepatch:/{print $NF}') == "Y" ]]; then
+
+		local i=0
+		while [ -e /sys/kernel/livepatch/"$mod" ]; do
+			i=$((i+1))
+			if [[ $i -eq $MAX_RETRIES ]]; then
+				die "failed to unload module $mod (/sys/livepatch)"
+			fi
+			sleep $RETRY_INTERVAL
+		done
+	fi
+}
+
+# display_lp(modname) - disable a livepatch
+#	modname - module name to unload
+function disable_lp() {
+	local mod="$1"
+
+        echo "% echo 0 > /sys/kernel/livepatch/$mod/enabled" > /dev/kmsg
+        echo 0 > /sys/kernel/livepatch/"$mod"/enabled
+
+	# Wait for livepatch enable to clear ...
+	local i=0
+	while [[ $(cat /sys/kernel/livepatch/"$mod"/enabled) != "0" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to disable livepatch $mod"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# set_pre_patch_ret(modname, pre_patch_ret)
+#	modname - module name to set
+#	pre_patch_ret - new pre_patch_ret value
+function set_pre_patch_ret {
+	local mod="$1"; shift
+        local ret="$1"
+
+        echo "% echo $1 > /sys/module/$mod/parameters/pre_patch_ret" > /dev/kmsg
+        echo "$1" > /sys/module/"$mod"/parameters/pre_patch_ret
+
+	local i=0
+	while [[ $(cat /sys/module/"$mod"/parameters/pre_patch_ret) != "$1" ]]; do
+		i=$((i+1))
+		if [[ $i -eq $MAX_RETRIES ]]; then
+			die "failed to set pre_patch_ret parameter for $mod module"
+		fi
+		sleep $RETRY_INTERVAL
+	done
+}
+
+# filter_dmesg() - print a filtered dmesg
+#	TODO - better filter, out of order msgs, etc?
+function check_result {
+	local expect="$*"
+	local result=$(dmesg | grep -v 'tainting' | grep -e 'livepatch:' -e 'test_klp' | sed 's/^\[[ 0-9.]*\] //')
+
+	if [[ "$expect" == "$result" ]] ; then
+		echo "ok"
+	else
+		echo -e "not ok\n\n$(diff -upr --label expected --label result <(echo "$expect") <(echo "$result"))\n"
+		die "livepatch kselftest(s) failed"
+	fi
+}
diff --git a/tools/testing/selftests/livepatch/test-callbacks.sh b/tools/testing/selftests/livepatch/test-callbacks.sh
new file mode 100755
index 000000000000..739d09bb3cff
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-callbacks.sh
@@ -0,0 +1,607 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_callbacks_demo
+MOD_LIVEPATCH2=test_klp_callbacks_demo2
+MOD_TARGET=test_klp_callbacks_mod
+MOD_TARGET_BUSY=test_klp_callbacks_busy
+
+set_dynamic_debug
+
+
+# TEST: target module before livepatch
+#
+# Test a combination of loading a kernel module and a livepatch that
+# patches a function in the first module.  Load the target module
+# before the livepatch module.  Unload them in the same order.
+#
+# - On livepatch enable, before the livepatch transition starts,
+#   pre-patch callbacks are executed for vmlinux and $MOD_TARGET (those
+#   klp_objects currently loaded).  After klp_objects are patched
+#   according to the klp_patch, their post-patch callbacks run and the
+#   transition completes.
+#
+# - Similarly, on livepatch disable, pre-patch callbacks run before the
+#   unpatching transition starts.  klp_objects are reverted, post-patch
+#   callbacks execute and the transition completes.
+
+echo -n "TEST: target module before livepatch ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming notifier
+#
+# This test is similar to the previous test, but (un)load the livepatch
+# module before the target kernel module.  This tests the livepatch
+# core's module_coming handler.
+#
+# - On livepatch enable, only pre/post-patch callbacks are executed for
+#   currently loaded klp_objects, in this case, vmlinux.
+#
+# - When a targeted module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - On livepatch disable, all currently loaded klp_objects' (vmlinux and
+#   $MOD_TARGET) pre/post-unpatch callbacks are executed.
+
+echo -n "TEST: module_coming notifier ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_going notifier
+#
+# Test loading the livepatch after a targeted kernel module, then unload
+# the kernel module before disabling the livepatch.  This tests the
+# livepatch core's module_going handler.
+#
+# - First load a target module, then the livepatch.
+#
+# - When a target module is unloaded, the livepatch is only reverted
+#   from that klp_object ($MOD_TARGET).  As such, only its pre and
+#   post-unpatch callbacks are executed when this occurs.
+#
+# - When the livepatch is disabled, pre and post-unpatch callbacks are
+#   run for the remaining klp_object, vmlinux.
+
+echo -n "TEST: module_going notifier ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: module_coming and module_going notifiers
+#
+# This test is similar to the previous test, however the livepatch is
+# loaded first.  This tests the livepatch core's module_coming and
+# module_going handlers.
+#
+# - First load the livepatch.
+#
+# - When a targeted kernel module is subsequently loaded, only its
+#   pre/post-patch callbacks are executed.
+#
+# - When the target module is unloaded, the livepatch is only reverted
+#   from the $MOD_TARGET klp_object.  As such, only pre and
+#   post-unpatch callbacks are executed when this occurs.
+
+echo -n "TEST: module_coming and module_going notifiers ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: target module not present
+#
+# A simple test of loading a livepatch without one of its patch target
+# klp_objects ever loaded ($MOD_TARGET).
+#
+# - Load the livepatch.
+#
+# - As expected, only pre/post-(un)patch handlers are executed for
+#   vmlinux.
+
+echo -n "TEST: target module not present ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: pre-patch callback -ENODEV
+#
+# Test a scenario where a vmlinux pre-patch callback returns a non-zero
+# status (ie, failure).
+#
+# - First load a target module.
+#
+# - Load the livepatch module, setting its 'pre_patch_ret' value to -19
+#   (-ENODEV).  When its vmlinux pre-patch callback executes, this
+#   status code will propagate back to the module-loading subsystem.
+#   The result is that the insmod command refuses to load the livepatch
+#   module.
+
+echo -n "TEST: pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_TARGET
+load_failing_mod $MOD_LIVEPATCH pre_patch_ret=-19
+unload_mod $MOD_TARGET
+
+check_result "% modprobe $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_init
+% modprobe $MOD_LIVEPATCH pre_patch_ret=-19
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_LIVE] Normal state
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: failed to enable patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': canceling patching transition, going to unpatch
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+modprobe: ERROR: could not insert '$MOD_LIVEPATCH': No such device
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit"
+
+
+# TEST: module_coming + pre-patch callback -ENODEV
+#
+# Similar to the previous test, setup a livepatch such that its vmlinux
+# pre-patch callback returns success.  However, when a targeted kernel
+# module is later loaded, have the livepatch return a failing status
+# code.
+#
+# - Load the livepatch, vmlinux pre-patch callback succeeds.
+#
+# - Set a trap so subsequent pre-patch callbacks to this livepatch will
+#   return -ENODEV.
+#
+# - The livepatch pre-patch callback for subsequently loaded target
+#   modules will return failure, so the module loader refuses to load
+#   the kernel module.  No post-patch or pre/post-unpatch callbacks are
+#   executed for this klp_object.
+#
+# - Pre/post-unpatch callbacks are run for the vmlinux klp_object.
+
+echo -n "TEST: module_coming + pre-patch callback -ENODEV ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+set_pre_patch_ret $MOD_LIVEPATCH -19
+load_failing_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo -19 > /sys/module/$MOD_LIVEPATCH/parameters/pre_patch_ret
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+livepatch: pre-patch callback failed for object '$MOD_TARGET'
+livepatch: patch '$MOD_LIVEPATCH' failed for module '$MOD_TARGET', refusing to load module '$MOD_TARGET'
+modprobe: ERROR: could not insert '$MOD_TARGET': No such device
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple target modules
+#
+# Test loading multiple targeted kernel modules.  This test-case is
+# mainly for comparing with the next test-case.
+#
+# - Load a target "busy" kernel module which kicks off a worker function
+#   that immediately exits.
+#
+# - Proceed with loading the livepatch and another ordinary target
+#   module.  Post-patch callbacks are executed and the transition
+#   completes quickly.
+
+echo -n "TEST: multiple target modules ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=0
+# give $MOD_TARGET_BUSY::busymod_work_func() a chance to run
+sleep 5
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=0
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 0 seconds ...
+$MOD_TARGET_BUSY: busymod_work_func exit
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_LIVEPATCH: post_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+
+# TEST: busy target module
+#
+# A similar test as the previous one, but force the "busy" kernel module
+# to do longer work.
+#
+# The livepatching core will refuse to patch a task that is currently
+# executing a to-be-patched function -- the consistency model stalls the
+# current patch transition until this safety-check is met.  Test a
+# scenario where one of a livepatch's target klp_objects sits on such a
+# function for a long time.  Meanwhile, load and unload other target
+# kernel modules while the livepatch transition is in progress.
+#
+# - Load the "busy" kernel module, this time make it do 10 seconds worth
+#   of work.
+#
+# - Meanwhile, the livepatch is loaded.  Notice that the patch
+#   transition does not complete as the targeted "busy" module is
+#   sitting on a to-be-patched function.
+#
+# - Load a second target module (this one is an ordinary idle kernel
+#   module).  Note that *no* post-patch callbacks will be executed while
+#   the livepatch is still in transition.
+#
+# - Request an unload of the simple kernel module.  The patch is still
+#   transitioning, so its pre-unpatch callbacks are skipped.
+#
+# - Finally the livepatch is disabled.  Since none of the patch's
+#   klp_object's post-patch callbacks executed, the remaining
+#   klp_object's pre-unpatch callbacks are skipped.
+
+echo -n "TEST: busy target module ... "
+dmesg -C
+
+load_mod $MOD_TARGET_BUSY sleep_secs=10
+load_mod $MOD_LIVEPATCH
+# Don't wait for transition, load $MOD_TARGET while the transition
+# is still stalled in $MOD_TARGET_BUSY::busymod_work_func()
+sleep 5
+load_mod $MOD_TARGET
+unload_mod $MOD_TARGET
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+unload_mod $MOD_TARGET_BUSY
+
+check_result "% modprobe $MOD_TARGET_BUSY sleep_secs=10
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_init
+$MOD_TARGET_BUSY: busymod_work_func, sleeping 10 seconds ...
+% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+% modprobe $MOD_TARGET
+livepatch: applying patch '$MOD_LIVEPATCH' to loading module '$MOD_TARGET'
+$MOD_LIVEPATCH: pre_patch_callback: $MOD_TARGET -> [MODULE_STATE_COMING] Full formed, running module_init
+$MOD_TARGET: ${MOD_TARGET}_init
+% rmmod $MOD_TARGET
+$MOD_TARGET: ${MOD_TARGET}_exit
+livepatch: reverting patch '$MOD_LIVEPATCH' on unloading module '$MOD_TARGET'
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET -> [MODULE_STATE_GOING] Going away
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': reversing transition from patching to unpatching
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: $MOD_TARGET_BUSY -> [MODULE_STATE_LIVE] Normal state
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH
+% rmmod $MOD_TARGET_BUSY
+$MOD_TARGET_BUSY: busymod_work_func exit
+$MOD_TARGET_BUSY: ${MOD_TARGET_BUSY}_exit"
+
+
+# TEST: multiple livepatches
+#
+# Test loading multiple livepatches.  This test-case is mainly for comparing
+# with the next test-case.
+#
+# - Load and unload two livepatches, pre and post (un)patch callbacks
+#   execute as each patch progresses through its (un)patching
+#   transition.
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+$MOD_LIVEPATCH: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+$MOD_LIVEPATCH: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace
+#
+# Load multiple livepatches, but the second as an 'atomic-replace'
+# patch.  When the latter laods, the original livepatch should be
+# disabled and *none* of its pre/post-unpatch callbacks executed.  On
+# the other hand, when the atomic-replace livepatch is disabled, its
+# pre/post-unpatch callbacks *should* be executed.
+#
+# - Load and unload two livepatches, the second of which has its
+#   .replace flag set true.
+#
+# - Pre and post patch callbacks are executed for both livepatches.
+#
+# - Once the atomic replace module is loaded, only its pre and post
+#   unpatch callbacks are executed.
+
+echo -n "TEST: atomic replace ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+load_mod $MOD_LIVEPATCH2 replace=1
+wait_for_transition $MOD_LIVEPATCH2
+disable_lp $MOD_LIVEPATCH2
+wait_for_transition $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH2
+unload_mod $MOD_LIVEPATCH
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+$MOD_LIVEPATCH: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+$MOD_LIVEPATCH: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH': patching complete
+% modprobe $MOD_LIVEPATCH2 replace=1
+livepatch: enabling patch '$MOD_LIVEPATCH2'
+livepatch: '$MOD_LIVEPATCH2': initializing patching transition
+$MOD_LIVEPATCH2: pre_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting patching transition
+livepatch: '$MOD_LIVEPATCH2': completing patching transition
+$MOD_LIVEPATCH2: post_patch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH2/enabled
+livepatch: '$MOD_LIVEPATCH2': initializing unpatching transition
+$MOD_LIVEPATCH2: pre_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH2': completing unpatching transition
+$MOD_LIVEPATCH2: post_unpatch_callback: vmlinux
+livepatch: '$MOD_LIVEPATCH2': unpatching complete
+% rmmod $MOD_LIVEPATCH2
+% rmmod $MOD_LIVEPATCH"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-livepatch.sh b/tools/testing/selftests/livepatch/test-livepatch.sh
new file mode 100755
index 000000000000..3e4b8072da84
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-livepatch.sh
@@ -0,0 +1,173 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_LIVEPATCH=test_klp_livepatch
+MOD_REPLACE=test_klp_atomic_replace
+
+set_dynamic_debug
+
+
+# TEST: basic function patching
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - unload the livepatch and make sure the patch was removed
+
+echo -n "TEST: basic function patching ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" != "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+if [[ "$(cat /proc/cmdline)" == "$MOD_LIVEPATCH: this has been live patched" ]] ; then
+	echo -e "FAIL\n\n"
+	die "livepatch kselftest(s) failed"
+fi
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: multiple livepatches
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load another livepatch and verify that both livepatches are active
+# - unload the second livepatch and verify that the first is still active
+# - unload the first livepatch and verify none are active
+
+echo -n "TEST: multiple livepatches ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=0
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_LIVEPATCH
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=0
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_LIVEPATCH: this has been live patched
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE
+$MOD_LIVEPATCH: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_LIVEPATCH/enabled
+livepatch: '$MOD_LIVEPATCH': initializing unpatching transition
+livepatch: '$MOD_LIVEPATCH': starting unpatching transition
+livepatch: '$MOD_LIVEPATCH': completing unpatching transition
+livepatch: '$MOD_LIVEPATCH': unpatching complete
+% rmmod $MOD_LIVEPATCH"
+
+
+# TEST: atomic replace livepatch
+# - load a livepatch that modifies the output from /proc/cmdline and
+#   verify correct behavior
+# - load an atomic replace livepatch and verify that only the second is active
+# - remove the first livepatch and verify that the atomic replace livepatch
+#   is still active
+# - remove the atomic replace livepatch and verify that none are active
+
+echo -n "TEST: atomic replace livepatch ... "
+dmesg -C
+
+load_mod $MOD_LIVEPATCH
+wait_for_transition $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+load_mod $MOD_REPLACE replace=1
+wait_for_transition $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+unload_mod $MOD_LIVEPATCH
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+disable_lp $MOD_REPLACE
+unload_mod $MOD_REPLACE
+
+grep 'live patched' /proc/cmdline > /dev/kmsg
+grep 'live patched' /proc/meminfo > /dev/kmsg
+
+check_result "% modprobe $MOD_LIVEPATCH
+livepatch: enabling patch '$MOD_LIVEPATCH'
+livepatch: '$MOD_LIVEPATCH': initializing patching transition
+livepatch: '$MOD_LIVEPATCH': starting patching transition
+livepatch: '$MOD_LIVEPATCH': completing patching transition
+livepatch: '$MOD_LIVEPATCH': patching complete
+$MOD_LIVEPATCH: this has been live patched
+% modprobe $MOD_REPLACE replace=1
+livepatch: enabling patch '$MOD_REPLACE'
+livepatch: '$MOD_REPLACE': initializing patching transition
+livepatch: '$MOD_REPLACE': starting patching transition
+livepatch: '$MOD_REPLACE': completing patching transition
+livepatch: '$MOD_REPLACE': patching complete
+$MOD_REPLACE: this has been live patched
+% rmmod $MOD_LIVEPATCH
+$MOD_REPLACE: this has been live patched
+% echo 0 > /sys/kernel/livepatch/$MOD_REPLACE/enabled
+livepatch: '$MOD_REPLACE': initializing unpatching transition
+livepatch: '$MOD_REPLACE': starting unpatching transition
+livepatch: '$MOD_REPLACE': completing unpatching transition
+livepatch: '$MOD_REPLACE': unpatching complete
+% rmmod $MOD_REPLACE"
+
+
+exit 0
diff --git a/tools/testing/selftests/livepatch/test-shadow-vars.sh b/tools/testing/selftests/livepatch/test-shadow-vars.sh
new file mode 100755
index 000000000000..96390a21b15d
--- /dev/null
+++ b/tools/testing/selftests/livepatch/test-shadow-vars.sh
@@ -0,0 +1,60 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2018 Joe Lawrence <joe.lawrence at redhat.com>
+
+. functions.sh
+
+MOD_TEST=test_klp_shadow_vars
+
+set_dynamic_debug
+
+
+# TEST: basic shadow variable API
+# - load a module that exercises the shadow variable API
+
+echo -n "TEST: basic shadow variable API ... "
+dmesg -C
+
+load_mod $MOD_TEST
+unload_mod $MOD_TEST
+
+check_result "% modprobe $MOD_TEST
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_ctor: PTR6 -> PTR1
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
+$MOD_TEST: shadow_ctor: PTR8 -> PTR2
+$MOD_TEST: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
+$MOD_TEST: shadow_ctor: PTR10 -> PTR3
+$MOD_TEST: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
+$MOD_TEST:   got expected PTR6 -> PTR1 result
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
+$MOD_TEST:   got expected PTR8 -> PTR2 result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_ctor: PTR11 -> PTR4
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
+$MOD_TEST:   got expected PTR11 -> PTR4 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR6)
+$MOD_TEST: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR9, shadow_data=PTR8)
+$MOD_TEST: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: shadow_dtor(obj=PTR12, shadow_data=PTR11)
+$MOD_TEST: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
+$MOD_TEST:   got expected NULL result
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
+$MOD_TEST:   got expected PTR10 -> PTR3 result
+$MOD_TEST: shadow_dtor(obj=PTR5, shadow_data=PTR10)
+$MOD_TEST: klp_shadow_free_all(id=0x1235, dtor=PTR13)
+$MOD_TEST: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
+$MOD_TEST:   shadow_get() got expected NULL result
+% rmmod test_klp_shadow_vars"
+
+exit 0
-- 
1.8.3.1

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Re: [PATCH v2] selftests/livepatch: introduce tests

[Josh Poimboeuf]

On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
> +static void test_klp_shadow_vars_exit(void)
> +{
> +}
> +
> +module_init(test_klp_shadow_vars_init);
> +module_init(test_klp_shadow_vars_exit);

For this last line, s/module_init/module_exit/, though I think the exit
function can just be removed altogether?

Also I get the following bug (run on latest Linus master + Petr's two
patch sets):

[  106.302072] % modprobe test_klp_shadow_vars
[  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.313080] test_klp_shadow_vars:   got expected NULL result
[  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
[  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
[  106.318107] 1 lock held by modprobe/2254:
[  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.321220] irq event stamp: 4408
[  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
[  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
[  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
[  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
[  106.327901] Preemption disabled at:
[  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
[  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
[  106.333143] Call Trace:
[  106.334011]  dump_stack+0x8e/0xd5
[  106.334962]  ___might_sleep+0x185/0x260
[  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.337170]  __might_sleep+0x4a/0x80
[  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
[  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
[  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
[  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.346494]  klp_shadow_alloc+0x10/0x20
[  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
[  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
[  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.352949]  do_one_initcall+0x61/0x37f
[  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
[  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
[  106.356098]  ? do_init_module+0x27/0x213
[  106.357090]  do_init_module+0x5f/0x213
[  106.358047]  load_module+0x2815/0x2e70
[  106.358992]  ? vfs_read+0x12d/0x150
[  106.359920]  SYSC_finit_module+0xfc/0x120
[  106.360870]  ? SYSC_finit_module+0xfc/0x120
[  106.361839]  SyS_finit_module+0xe/0x10
[  106.362753]  do_syscall_64+0x7e/0x240
[  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  106.364711] RIP: 0033:0x7f26d0d40b19
[  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
[  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
[  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
[  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0
[  106.373900] test_klp_shadow_vars: shadow_ctor: PTR6 -> PTR1
[  106.375249] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
[  106.378893] test_klp_shadow_vars: shadow_ctor: PTR8 -> PTR2
[  106.380305] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
[  106.382779] test_klp_shadow_vars: shadow_ctor: PTR10 -> PTR3
[  106.384131] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
[  106.386584] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
[  106.387929] test_klp_shadow_vars:   got expected PTR6 -> PTR1 result
[  106.389181] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
[  106.390488] test_klp_shadow_vars:   got expected PTR8 -> PTR2 result
[  106.391731] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.393066] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.394347] test_klp_shadow_vars: shadow_ctor: PTR11 -> PTR4
[  106.395523] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.398033] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.400554] test_klp_shadow_vars:   got expected PTR11 -> PTR4 result
[  106.401937] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR6)
[  106.403592] test_klp_shadow_vars: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
[  106.405083] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.406500] test_klp_shadow_vars:   got expected NULL result
[  106.407735] test_klp_shadow_vars: shadow_dtor(obj=PTR9, shadow_data=PTR8)
[  106.409252] test_klp_shadow_vars: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
[  106.410867] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
[  106.412232] test_klp_shadow_vars:   got expected NULL result
[  106.413461] test_klp_shadow_vars: shadow_dtor(obj=PTR12, shadow_data=PTR11)
[  106.414888] test_klp_shadow_vars: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
[  106.416319] test_klp_shadow_vars: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
[  106.417681] test_klp_shadow_vars:   got expected NULL result
[  106.418947] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.420314] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.421658] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR10)
[  106.423065] test_klp_shadow_vars: klp_shadow_free_all(id=0x1235, dtor=PTR13)
[  106.424421] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.425745] test_klp_shadow_vars:   shadow_get() got expected NULL result
[  106.438719] % rmmod test_klp_shadow_vars


-- 
Josh

[PATCH v2] selftests/livepatch: introduce tests

[Josh Poimboeuf]

On Tue, Apr 10, 2018@11:15:54AM -0400, Joe Lawrence wrote:
> +static void test_klp_shadow_vars_exit(void)
> +{
> +}
> +
> +module_init(test_klp_shadow_vars_init);
> +module_init(test_klp_shadow_vars_exit);

For this last line, s/module_init/module_exit/, though I think the exit
function can just be removed altogether?

Also I get the following bug (run on latest Linus master + Petr's two
patch sets):

[  106.302072] % modprobe test_klp_shadow_vars
[  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.313080] test_klp_shadow_vars:   got expected NULL result
[  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
[  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
[  106.318107] 1 lock held by modprobe/2254:
[  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.321220] irq event stamp: 4408
[  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
[  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
[  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
[  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
[  106.327901] Preemption disabled at:
[  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
[  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
[  106.333143] Call Trace:
[  106.334011]  dump_stack+0x8e/0xd5
[  106.334962]  ___might_sleep+0x185/0x260
[  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.337170]  __might_sleep+0x4a/0x80
[  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
[  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
[  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
[  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.346494]  klp_shadow_alloc+0x10/0x20
[  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
[  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
[  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.352949]  do_one_initcall+0x61/0x37f
[  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
[  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
[  106.356098]  ? do_init_module+0x27/0x213
[  106.357090]  do_init_module+0x5f/0x213
[  106.358047]  load_module+0x2815/0x2e70
[  106.358992]  ? vfs_read+0x12d/0x150
[  106.359920]  SYSC_finit_module+0xfc/0x120
[  106.360870]  ? SYSC_finit_module+0xfc/0x120
[  106.361839]  SyS_finit_module+0xe/0x10
[  106.362753]  do_syscall_64+0x7e/0x240
[  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  106.364711] RIP: 0033:0x7f26d0d40b19
[  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
[  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
[  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
[  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0
[  106.373900] test_klp_shadow_vars: shadow_ctor: PTR6 -> PTR1
[  106.375249] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
[  106.378893] test_klp_shadow_vars: shadow_ctor: PTR8 -> PTR2
[  106.380305] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
[  106.382779] test_klp_shadow_vars: shadow_ctor: PTR10 -> PTR3
[  106.384131] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
[  106.386584] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
[  106.387929] test_klp_shadow_vars:   got expected PTR6 -> PTR1 result
[  106.389181] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
[  106.390488] test_klp_shadow_vars:   got expected PTR8 -> PTR2 result
[  106.391731] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.393066] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.394347] test_klp_shadow_vars: shadow_ctor: PTR11 -> PTR4
[  106.395523] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.398033] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.400554] test_klp_shadow_vars:   got expected PTR11 -> PTR4 result
[  106.401937] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR6)
[  106.403592] test_klp_shadow_vars: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
[  106.405083] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.406500] test_klp_shadow_vars:   got expected NULL result
[  106.407735] test_klp_shadow_vars: shadow_dtor(obj=PTR9, shadow_data=PTR8)
[  106.409252] test_klp_shadow_vars: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
[  106.410867] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
[  106.412232] test_klp_shadow_vars:   got expected NULL result
[  106.413461] test_klp_shadow_vars: shadow_dtor(obj=PTR12, shadow_data=PTR11)
[  106.414888] test_klp_shadow_vars: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
[  106.416319] test_klp_shadow_vars: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
[  106.417681] test_klp_shadow_vars:   got expected NULL result
[  106.418947] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.420314] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.421658] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR10)
[  106.423065] test_klp_shadow_vars: klp_shadow_free_all(id=0x1235, dtor=PTR13)
[  106.424421] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.425745] test_klp_shadow_vars:   shadow_get() got expected NULL result
[  106.438719] % rmmod test_klp_shadow_vars


-- 
Josh
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[PATCH v2] selftests/livepatch: introduce tests

[jpoimboe]

On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
> +static void test_klp_shadow_vars_exit(void)
> +{
> +}
> +
> +module_init(test_klp_shadow_vars_init);
> +module_init(test_klp_shadow_vars_exit);

For this last line, s/module_init/module_exit/, though I think the exit
function can just be removed altogether?

Also I get the following bug (run on latest Linus master + Petr's two
patch sets):

[  106.302072] % modprobe test_klp_shadow_vars
[  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.313080] test_klp_shadow_vars:   got expected NULL result
[  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
[  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
[  106.318107] 1 lock held by modprobe/2254:
[  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.321220] irq event stamp: 4408
[  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
[  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
[  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
[  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
[  106.327901] Preemption disabled at:
[  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
[  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
[  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
[  106.333143] Call Trace:
[  106.334011]  dump_stack+0x8e/0xd5
[  106.334962]  ___might_sleep+0x185/0x260
[  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.337170]  __might_sleep+0x4a/0x80
[  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
[  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
[  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
[  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
[  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
[  106.346494]  klp_shadow_alloc+0x10/0x20
[  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
[  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
[  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
[  106.352949]  do_one_initcall+0x61/0x37f
[  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
[  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
[  106.356098]  ? do_init_module+0x27/0x213
[  106.357090]  do_init_module+0x5f/0x213
[  106.358047]  load_module+0x2815/0x2e70
[  106.358992]  ? vfs_read+0x12d/0x150
[  106.359920]  SYSC_finit_module+0xfc/0x120
[  106.360870]  ? SYSC_finit_module+0xfc/0x120
[  106.361839]  SyS_finit_module+0xe/0x10
[  106.362753]  do_syscall_64+0x7e/0x240
[  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
[  106.364711] RIP: 0033:0x7f26d0d40b19
[  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
[  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
[  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
[  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
[  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0
[  106.373900] test_klp_shadow_vars: shadow_ctor: PTR6 -> PTR1
[  106.375249] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR1 = PTR6
[  106.378893] test_klp_shadow_vars: shadow_ctor: PTR8 -> PTR2
[  106.380305] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR9, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR2 = PTR8
[  106.382779] test_klp_shadow_vars: shadow_ctor: PTR10 -> PTR3
[  106.384131] test_klp_shadow_vars: klp_shadow_alloc(obj=PTR5, id=0x1235, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR3 = PTR10
[  106.386584] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR6
[  106.387929] test_klp_shadow_vars:   got expected PTR6 -> PTR1 result
[  106.389181] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR8
[  106.390488] test_klp_shadow_vars:   got expected PTR8 -> PTR2 result
[  106.391731] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.393066] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.394347] test_klp_shadow_vars: shadow_ctor: PTR11 -> PTR4
[  106.395523] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.398033] test_klp_shadow_vars: klp_shadow_get_or_alloc(obj=PTR12, id=0x1234, size=8, gfp_flags=GFP_KERNEL), ctor=PTR7, ctor_data=PTR4 = PTR11
[  106.400554] test_klp_shadow_vars:   got expected PTR11 -> PTR4 result
[  106.401937] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR6)
[  106.403592] test_klp_shadow_vars: klp_shadow_free(obj=PTR5, id=0x1234, dtor=PTR13)
[  106.405083] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.406500] test_klp_shadow_vars:   got expected NULL result
[  106.407735] test_klp_shadow_vars: shadow_dtor(obj=PTR9, shadow_data=PTR8)
[  106.409252] test_klp_shadow_vars: klp_shadow_free(obj=PTR9, id=0x1234, dtor=PTR13)
[  106.410867] test_klp_shadow_vars: klp_shadow_get(obj=PTR9, id=0x1234) = PTR0
[  106.412232] test_klp_shadow_vars:   got expected NULL result
[  106.413461] test_klp_shadow_vars: shadow_dtor(obj=PTR12, shadow_data=PTR11)
[  106.414888] test_klp_shadow_vars: klp_shadow_free(obj=PTR12, id=0x1234, dtor=PTR13)
[  106.416319] test_klp_shadow_vars: klp_shadow_get(obj=PTR12, id=0x1234) = PTR0
[  106.417681] test_klp_shadow_vars:   got expected NULL result
[  106.418947] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1235) = PTR10
[  106.420314] test_klp_shadow_vars:   got expected PTR10 -> PTR3 result
[  106.421658] test_klp_shadow_vars: shadow_dtor(obj=PTR5, shadow_data=PTR10)
[  106.423065] test_klp_shadow_vars: klp_shadow_free_all(id=0x1235, dtor=PTR13)
[  106.424421] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
[  106.425745] test_klp_shadow_vars:   shadow_get() got expected NULL result
[  106.438719] % rmmod test_klp_shadow_vars


-- 
Josh
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Re: [PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
>> +static void test_klp_shadow_vars_exit(void)
>> +{
>> +}
>> +
>> +module_init(test_klp_shadow_vars_init);
>> +module_init(test_klp_shadow_vars_exit);
> 
> For this last line, s/module_init/module_exit/, though I think the exit
> function can just be removed altogether?

D'oh workspace / git user error, I posted an older version :(

But the exit function seems to be required if an init function is
provided.  Here I omitted the exit function:

  % modprobe test_klp_shadow_vars
  % lsmod | grep test_klp_shadow_vars
  test_klp_shadow_vars    16384  0
  % rmmod test_klp_shadow_vars
  rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
    resource busy
  rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
    resource busy

and from kernel/module.c

SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
                unsigned int, flags)
...
        /* If it has an init func, it must have an exit func to unload*/
        if (mod->init && !mod->exit) {
                forced = try_force_unload(flags);
                if (!forced) {
                        /* This module can't be removed */
                        ret = -EBUSY;
                        goto out;
                }
        }
...

> 
> Also I get the following bug (run on latest Linus master + Petr's two
> patch sets):
> 
> [  106.302072] % modprobe test_klp_shadow_vars
> [  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
> [  106.313080] test_klp_shadow_vars:   got expected NULL result
> [  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
> [  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
> [  106.318107] 1 lock held by modprobe/2254:
> [  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.321220] irq event stamp: 4408
> [  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
> [  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
> [  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
> [  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
> [  106.327901] Preemption disabled at:
> [  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
> [  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
> [  106.333143] Call Trace:
> [  106.334011]  dump_stack+0x8e/0xd5
> [  106.334962]  ___might_sleep+0x185/0x260
> [  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.337170]  __might_sleep+0x4a/0x80
> [  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
> [  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
> [  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
> [  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.346494]  klp_shadow_alloc+0x10/0x20
> [  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
> [  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
> [  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.352949]  do_one_initcall+0x61/0x37f
> [  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
> [  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
> [  106.356098]  ? do_init_module+0x27/0x213
> [  106.357090]  do_init_module+0x5f/0x213
> [  106.358047]  load_module+0x2815/0x2e70
> [  106.358992]  ? vfs_read+0x12d/0x150
> [  106.359920]  SYSC_finit_module+0xfc/0x120
> [  106.360870]  ? SYSC_finit_module+0xfc/0x120
> [  106.361839]  SyS_finit_module+0xe/0x10
> [  106.362753]  do_syscall_64+0x7e/0x240
> [  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
> [  106.364711] RIP: 0033:0x7f26d0d40b19
> [  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
> [  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
> [  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
> [  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
> [  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0

I missed Petr's commit msg note "that the constructor is called under
klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
allocation.

I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
other debug option suggestions?

-- Joe

[PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> On Tue, Apr 10, 2018@11:15:54AM -0400, Joe Lawrence wrote:
>> +static void test_klp_shadow_vars_exit(void)
>> +{
>> +}
>> +
>> +module_init(test_klp_shadow_vars_init);
>> +module_init(test_klp_shadow_vars_exit);
> 
> For this last line, s/module_init/module_exit/, though I think the exit
> function can just be removed altogether?

D'oh workspace / git user error, I posted an older version :(

But the exit function seems to be required if an init function is
provided.  Here I omitted the exit function:

  % modprobe test_klp_shadow_vars
  % lsmod | grep test_klp_shadow_vars
  test_klp_shadow_vars    16384  0
  % rmmod test_klp_shadow_vars
  rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
    resource busy
  rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
    resource busy

and from kernel/module.c

SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
                unsigned int, flags)
...
        /* If it has an init func, it must have an exit func to unload*/
        if (mod->init && !mod->exit) {
                forced = try_force_unload(flags);
                if (!forced) {
                        /* This module can't be removed */
                        ret = -EBUSY;
                        goto out;
                }
        }
...

> 
> Also I get the following bug (run on latest Linus master + Petr's two
> patch sets):
> 
> [  106.302072] % modprobe test_klp_shadow_vars
> [  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
> [  106.313080] test_klp_shadow_vars:   got expected NULL result
> [  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
> [  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
> [  106.318107] 1 lock held by modprobe/2254:
> [  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.321220] irq event stamp: 4408
> [  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
> [  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
> [  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
> [  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
> [  106.327901] Preemption disabled at:
> [  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
> [  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
> [  106.333143] Call Trace:
> [  106.334011]  dump_stack+0x8e/0xd5
> [  106.334962]  ___might_sleep+0x185/0x260
> [  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.337170]  __might_sleep+0x4a/0x80
> [  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
> [  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
> [  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
> [  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.346494]  klp_shadow_alloc+0x10/0x20
> [  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
> [  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
> [  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.352949]  do_one_initcall+0x61/0x37f
> [  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
> [  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
> [  106.356098]  ? do_init_module+0x27/0x213
> [  106.357090]  do_init_module+0x5f/0x213
> [  106.358047]  load_module+0x2815/0x2e70
> [  106.358992]  ? vfs_read+0x12d/0x150
> [  106.359920]  SYSC_finit_module+0xfc/0x120
> [  106.360870]  ? SYSC_finit_module+0xfc/0x120
> [  106.361839]  SyS_finit_module+0xe/0x10
> [  106.362753]  do_syscall_64+0x7e/0x240
> [  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
> [  106.364711] RIP: 0033:0x7f26d0d40b19
> [  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
> [  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
> [  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
> [  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
> [  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0

I missed Petr's commit msg note "that the constructor is called under
klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
allocation.

I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
other debug option suggestions?

-- Joe
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[PATCH v2] selftests/livepatch: introduce tests

[joe.lawrence]

On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
>> +static void test_klp_shadow_vars_exit(void)
>> +{
>> +}
>> +
>> +module_init(test_klp_shadow_vars_init);
>> +module_init(test_klp_shadow_vars_exit);
> 
> For this last line, s/module_init/module_exit/, though I think the exit
> function can just be removed altogether?

D'oh workspace / git user error, I posted an older version :(

But the exit function seems to be required if an init function is
provided.  Here I omitted the exit function:

  % modprobe test_klp_shadow_vars
  % lsmod | grep test_klp_shadow_vars
  test_klp_shadow_vars    16384  0
  % rmmod test_klp_shadow_vars
  rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
    resource busy
  rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
    resource busy

and from kernel/module.c

SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
                unsigned int, flags)
...
        /* If it has an init func, it must have an exit func to unload*/
        if (mod->init && !mod->exit) {
                forced = try_force_unload(flags);
                if (!forced) {
                        /* This module can't be removed */
                        ret = -EBUSY;
                        goto out;
                }
        }
...

> 
> Also I get the following bug (run on latest Linus master + Petr's two
> patch sets):
> 
> [  106.302072] % modprobe test_klp_shadow_vars
> [  106.311165] test_klp_shadow_vars: klp_shadow_get(obj=PTR5, id=0x1234) = PTR0
> [  106.313080] test_klp_shadow_vars:   got expected NULL result
> [  106.314811] BUG: sleeping function called from invalid context at mm/slab.h:421
> [  106.316518] in_atomic(): 1, irqs_disabled(): 1, pid: 2254, name: modprobe
> [  106.318107] 1 lock held by modprobe/2254:
> [  106.319332]  #0: 00000000d0851080 (klp_shadow_lock){....}, at: __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.321220] irq event stamp: 4408
> [  106.322176] hardirqs last  enabled at (4407): [<ffffffff8114c28e>] console_unlock+0x44e/0x680
> [  106.323598] hardirqs last disabled at (4408): [<ffffffff8199e6c7>] _raw_spin_lock_irqsave+0x27/0x90
> [  106.325041] softirqs last  enabled at (4404): [<ffffffff81c0039b>] __do_softirq+0x39b/0x4fc
> [  106.326469] softirqs last disabled at (4367): [<ffffffff810d8450>] irq_exit+0xe0/0xf0
> [  106.327901] Preemption disabled at:
> [  106.327905] [<ffffffff81167c28>] __klp_shadow_get_or_alloc+0x88/0x1b0
> [  106.330117] CPU: 7 PID: 2254 Comm: modprobe Tainted: G              K  4.16.0+ #60
> [  106.331565] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014
> [  106.333143] Call Trace:
> [  106.334011]  dump_stack+0x8e/0xd5
> [  106.334962]  ___might_sleep+0x185/0x260
> [  106.335997]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.337170]  __might_sleep+0x4a/0x80
> [  106.338137]  kmem_cache_alloc_trace+0x20b/0x300
> [  106.339183]  ? ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.340341]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.341506]  ptr_id+0x5c/0xd0 [test_klp_shadow_vars]
> [  106.342725]  shadow_ctor+0x20/0x40 [test_klp_shadow_vars]
> [  106.343998]  __klp_shadow_get_or_alloc+0xc4/0x1b0
> [  106.345184]  ? shadow_dtor+0x40/0x40 [test_klp_shadow_vars]
> [  106.346494]  klp_shadow_alloc+0x10/0x20
> [  106.347583]  shadow_alloc+0x28/0xa0 [test_klp_shadow_vars]
> [  106.348871]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.350200]  test_klp_shadow_vars_init+0x96/0x400 [test_klp_shadow_vars]
> [  106.351646]  ? shadow_free_all+0x40/0x40 [test_klp_shadow_vars]
> [  106.352949]  do_one_initcall+0x61/0x37f
> [  106.353963]  ? rcu_read_lock_sched_held+0x79/0x80
> [  106.355040]  ? kmem_cache_alloc_trace+0x29d/0x300
> [  106.356098]  ? do_init_module+0x27/0x213
> [  106.357090]  do_init_module+0x5f/0x213
> [  106.358047]  load_module+0x2815/0x2e70
> [  106.358992]  ? vfs_read+0x12d/0x150
> [  106.359920]  SYSC_finit_module+0xfc/0x120
> [  106.360870]  ? SYSC_finit_module+0xfc/0x120
> [  106.361839]  SyS_finit_module+0xe/0x10
> [  106.362753]  do_syscall_64+0x7e/0x240
> [  106.363645]  entry_SYSCALL_64_after_hwframe+0x42/0xb7
> [  106.364711] RIP: 0033:0x7f26d0d40b19
> [  106.365799] RSP: 002b:00007ffee1de19a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> [  106.367306] RAX: ffffffffffffffda RBX: 00005636550d54b0 RCX: 00007f26d0d40b19
> [  106.368573] RDX: 0000000000000000 RSI: 0000563654134186 RDI: 0000000000000003
> [  106.369950] RBP: 0000563654134186 R08: 0000000000000000 R09: 00005636550d4270
> [  106.371164] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
> [  106.372422] R13: 00005636550d53b0 R14: 0000000000040000 R15: 00005636550d54b0

I missed Petr's commit msg note "that the constructor is called under
klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
allocation.

I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
other debug option suggestions?

-- Joe
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Re: [PATCH v2] selftests/livepatch: introduce tests

[Josh Poimboeuf]

On Tue, Apr 10, 2018 at 04:50:51PM -0400, Joe Lawrence wrote:
> On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> > On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
> >> +static void test_klp_shadow_vars_exit(void)
> >> +{
> >> +}
> >> +
> >> +module_init(test_klp_shadow_vars_init);
> >> +module_init(test_klp_shadow_vars_exit);
> > 
> > For this last line, s/module_init/module_exit/, though I think the exit
> > function can just be removed altogether?
> 
> D'oh workspace / git user error, I posted an older version :(
> 
> But the exit function seems to be required if an init function is
> provided.  Here I omitted the exit function:
> 
>   % modprobe test_klp_shadow_vars
>   % lsmod | grep test_klp_shadow_vars
>   test_klp_shadow_vars    16384  0
>   % rmmod test_klp_shadow_vars
>   rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
>     resource busy
>   rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
>     resource busy
> 
> and from kernel/module.c
> 
> SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
>                 unsigned int, flags)
> ...
>         /* If it has an init func, it must have an exit func to unload*/
>         if (mod->init && !mod->exit) {
>                 forced = try_force_unload(flags);
>                 if (!forced) {
>                         /* This module can't be removed */
>                         ret = -EBUSY;
>                         goto out;
>                 }
>         }
> ...

Hm, ok, though that seems like a weird limitation...

> I missed Petr's commit msg note "that the constructor is called under
> klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
> allocation.
> 
> I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
> other debug option suggestions?

I think CONFIG_LOCKDEP is always a good idea.  Otherwise, I dunno...
Here's my .config:

  https://paste.fedoraproject.org/paste/cnM-J18uVWJrxz2DAdSchg

-- 
Josh

[PATCH v2] selftests/livepatch: introduce tests

[Josh Poimboeuf]

On Tue, Apr 10, 2018@04:50:51PM -0400, Joe Lawrence wrote:
> On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> > On Tue, Apr 10, 2018@11:15:54AM -0400, Joe Lawrence wrote:
> >> +static void test_klp_shadow_vars_exit(void)
> >> +{
> >> +}
> >> +
> >> +module_init(test_klp_shadow_vars_init);
> >> +module_init(test_klp_shadow_vars_exit);
> > 
> > For this last line, s/module_init/module_exit/, though I think the exit
> > function can just be removed altogether?
> 
> D'oh workspace / git user error, I posted an older version :(
> 
> But the exit function seems to be required if an init function is
> provided.  Here I omitted the exit function:
> 
>   % modprobe test_klp_shadow_vars
>   % lsmod | grep test_klp_shadow_vars
>   test_klp_shadow_vars    16384  0
>   % rmmod test_klp_shadow_vars
>   rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
>     resource busy
>   rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
>     resource busy
> 
> and from kernel/module.c
> 
> SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
>                 unsigned int, flags)
> ...
>         /* If it has an init func, it must have an exit func to unload*/
>         if (mod->init && !mod->exit) {
>                 forced = try_force_unload(flags);
>                 if (!forced) {
>                         /* This module can't be removed */
>                         ret = -EBUSY;
>                         goto out;
>                 }
>         }
> ...

Hm, ok, though that seems like a weird limitation...

> I missed Petr's commit msg note "that the constructor is called under
> klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
> allocation.
> 
> I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
> other debug option suggestions?

I think CONFIG_LOCKDEP is always a good idea.  Otherwise, I dunno...
Here's my .config:

  https://paste.fedoraproject.org/paste/cnM-J18uVWJrxz2DAdSchg

-- 
Josh
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[PATCH v2] selftests/livepatch: introduce tests

[jpoimboe]

On Tue, Apr 10, 2018 at 04:50:51PM -0400, Joe Lawrence wrote:
> On 04/10/2018 04:00 PM, Josh Poimboeuf wrote:
> > On Tue, Apr 10, 2018 at 11:15:54AM -0400, Joe Lawrence wrote:
> >> +static void test_klp_shadow_vars_exit(void)
> >> +{
> >> +}
> >> +
> >> +module_init(test_klp_shadow_vars_init);
> >> +module_init(test_klp_shadow_vars_exit);
> > 
> > For this last line, s/module_init/module_exit/, though I think the exit
> > function can just be removed altogether?
> 
> D'oh workspace / git user error, I posted an older version :(
> 
> But the exit function seems to be required if an init function is
> provided.  Here I omitted the exit function:
> 
>   % modprobe test_klp_shadow_vars
>   % lsmod | grep test_klp_shadow_vars
>   test_klp_shadow_vars    16384  0
>   % rmmod test_klp_shadow_vars
>   rmmod: ERROR: could not remove 'test_klp_shadow_vars': Device or
>     resource busy
>   rmmod: ERROR: could not remove module test_klp_shadow_vars: Device or
>     resource busy
> 
> and from kernel/module.c
> 
> SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
>                 unsigned int, flags)
> ...
>         /* If it has an init func, it must have an exit func to unload*/
>         if (mod->init && !mod->exit) {
>                 forced = try_force_unload(flags);
>                 if (!forced) {
>                         /* This module can't be removed */
>                         ret = -EBUSY;
>                         goto out;
>                 }
>         }
> ...

Hm, ok, though that seems like a weird limitation...

> I missed Petr's commit msg note "that the constructor is called under
> klp_shadow_lock."  I'll convert the test to use GFP_ATOMIC for this
> allocation.
> 
> I'll also add CONFIG_PM_SLEEP_DEBUG=y to my test VM kernel .config.  Any
> other debug option suggestions?

I think CONFIG_LOCKDEP is always a good idea.  Otherwise, I dunno...
Here's my .config:

  https://paste.fedoraproject.org/paste/cnM-J18uVWJrxz2DAdSchg

-- 
Josh
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Re: [PATCH v2] selftests/livepatch: introduce tests

[Jiri Kosina]

On Tue, 10 Apr 2018, Josh Poimboeuf wrote:

> I think CONFIG_LOCKDEP is always a good idea. 

FWIW CONFIG_LOCKDEP mostly enables the infrastructure, but 
CONFIG_PROVE_LOCKING is what turns most of the cleverness on.

-- 
Jiri Kosina
SUSE Labs

[PATCH v2] selftests/livepatch: introduce tests

[Jiri Kosina]

On Tue, 10 Apr 2018, Josh Poimboeuf wrote:

> I think CONFIG_LOCKDEP is always a good idea. 

FWIW CONFIG_LOCKDEP mostly enables the infrastructure, but 
CONFIG_PROVE_LOCKING is what turns most of the cleverness on.

-- 
Jiri Kosina
SUSE Labs

--
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[PATCH v2] selftests/livepatch: introduce tests

[jikos]

On Tue, 10 Apr 2018, Josh Poimboeuf wrote:

> I think CONFIG_LOCKDEP is always a good idea. 

FWIW CONFIG_LOCKDEP mostly enables the infrastructure, but 
CONFIG_PROVE_LOCKING is what turns most of the cleverness on.

-- 
Jiri Kosina
SUSE Labs

--
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Re: [PATCH v2] selftests/livepatch: introduce tests

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 35450 bytes --]

Hi Joe,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on v4.16]
[also build test ERROR on next-20180410]
[cannot apply to linus/master jikos-livepatching/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Joe-Lawrence/selftests-livepatch-introduce-tests/20180411-093112
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   lib/livepatch/test_klp_shadow_vars.c:76:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:76:9: sparse: got "\001"
   lib/livepatch/test_klp_shadow_vars.c:79:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:79:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:79:16: sparse: got ret
   lib/livepatch/test_klp_shadow_vars.c:80:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:80:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:88:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:88:9: sparse: got "\001"
   lib/livepatch/test_klp_shadow_vars.c:91:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:91:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:91:16: sparse: got ret
   lib/livepatch/test_klp_shadow_vars.c:92:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:92:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:97:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:97:9: sparse: got "\001"
   lib/livepatch/test_klp_shadow_vars.c:99:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:99:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:104:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:104:9: sparse: got "\001"
   lib/livepatch/test_klp_shadow_vars.c:106:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:106:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:114:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:114:9: sparse: got "\001"
   lib/livepatch/test_klp_shadow_vars.c:117:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:117:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:117:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:118:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:118:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:124:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:124:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:138:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:138:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:139:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:139:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:140:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:140:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:141:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:141:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:142:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:142:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:149:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:149:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:149:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:164:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:164:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:164:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:168:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:168:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:168:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:172:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:172:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:172:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:182:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:182:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:182:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:192:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:192:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:192:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:195:25: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:195:25: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:197:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:197:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:197:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:200:25: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:200:25: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:202:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:202:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:202:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:209:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:209:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:209:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:216:28: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:216:28: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:218:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:218:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:218:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:224:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:224:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:224:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:225:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:225:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:231:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:231:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:113:23: sparse: undefined identifier 'ctor_data'
   lib/livepatch/test_klp_shadow_vars.c:148:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:148:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
   lib/livepatch/test_klp_shadow_vars.c:155:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:155:9: sparse: symbol 'sv1' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:156:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:156:9: sparse: symbol 'sv2' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:157:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:157:9: sparse: symbol 'sv3' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:163:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:163:9: sparse: symbol 'ret' has multiple initializers (originally initialized at lib/livepatch/test_klp_shadow_vars.c:148)
   lib/livepatch/test_klp_shadow_vars.c:163:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
   lib/livepatch/test_klp_shadow_vars.c:167:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:167:9: sparse: symbol 'ret' has multiple initializers (originally initialized at lib/livepatch/test_klp_shadow_vars.c:163)
   lib/livepatch/test_klp_shadow_vars.c:167:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
   lib/livepatch/test_klp_shadow_vars.c:171:26: sparse: too many errors
>> lib/livepatch/test_klp_shadow_vars.c:72:6: error: unknown type name 'klp_shadow_ctor_t'
         klp_shadow_ctor_t ctor, void *ctor_data)
         ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c:83:23: error: unknown type name 'klp_shadow_ctor_t'
         gfp_t gfp_flags, klp_shadow_ctor_t ctor,
                          ^~~~~~~~~~~~~~~~~
>> lib/livepatch/test_klp_shadow_vars.c:94:47: error: unknown type name 'klp_shadow_dtor_t'
    void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
                                                  ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c:101:40: error: unknown type name 'klp_shadow_dtor_t'
    void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
                                           ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c: In function 'test_klp_shadow_vars_init':
>> lib/livepatch/test_klp_shadow_vars.c:155:8: error: implicit declaration of function 'shadow_alloc'; did you mean 'shadow_dtor'? [-Werror=implicit-function-declaration]
     sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
           ^~~~~~~~~~~~
           shadow_dtor
>> lib/livepatch/test_klp_shadow_vars.c:155:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
         ^
   lib/livepatch/test_klp_shadow_vars.c:156:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
         ^
   lib/livepatch/test_klp_shadow_vars.c:157:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
         ^
>> lib/livepatch/test_klp_shadow_vars.c:180:8: error: implicit declaration of function 'shadow_get_or_alloc'; did you mean 'klp_shadow_get_or_alloc'? [-Werror=implicit-function-declaration]
     sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
           ^~~~~~~~~~~~~~~~~~~
           klp_shadow_get_or_alloc
   lib/livepatch/test_klp_shadow_vars.c:180:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
         ^
   lib/livepatch/test_klp_shadow_vars.c:181:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
         ^
>> lib/livepatch/test_klp_shadow_vars.c:190:2: error: implicit declaration of function 'shadow_free'; did you mean 'shadow_get'? [-Werror=implicit-function-declaration]
     shadow_free(obj, id, shadow_dtor);   /* sv1 */
     ^~~~~~~~~~~
     shadow_get
>> lib/livepatch/test_klp_shadow_vars.c:216:2: error: implicit declaration of function 'shadow_free_all'; did you mean 'klp_shadow_free_all'? [-Werror=implicit-function-declaration]
     shadow_free_all(id + 1, shadow_dtor);   /* sv3 */
     ^~~~~~~~~~~~~~~
     klp_shadow_free_all
   In file included from lib/livepatch/test_klp_shadow_vars.c:6:0:
   lib/livepatch/test_klp_shadow_vars.c: At top level:
   include/linux/module.h:130:42: error: redefinition of '__inittest'
     static inline initcall_t __maybe_unused __inittest(void)  \
                                             ^
>> lib/livepatch/test_klp_shadow_vars.c:232:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_exit);
    ^~~~~~~~~~~
   include/linux/module.h:130:42: note: previous definition of '__inittest' was here
     static inline initcall_t __maybe_unused __inittest(void)  \
                                             ^
   lib/livepatch/test_klp_shadow_vars.c:231:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_init);
    ^~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c: In function '__inittest':
>> lib/livepatch/test_klp_shadow_vars.c:232:13: error: return from incompatible pointer type [-Werror=incompatible-pointer-types]
    module_init(test_klp_shadow_vars_exit);
                ^
   include/linux/module.h:131:11: note: in definition of macro 'module_init'
     { return initfn; }     \
              ^~~~~~
   lib/livepatch/test_klp_shadow_vars.c: At top level:
   include/linux/module.h:132:6: error: redefinition of 'init_module'
     int init_module(void) __attribute__((alias(#initfn)));
         ^
>> lib/livepatch/test_klp_shadow_vars.c:232:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_exit);
    ^~~~~~~~~~~
   include/linux/module.h:132:6: note: previous definition of 'init_module' was here
     int init_module(void) __attribute__((alias(#initfn)));
         ^
   lib/livepatch/test_klp_shadow_vars.c:231:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_init);
    ^~~~~~~~~~~
   cc1: some warnings being treated as errors

sparse warnings: (new ones prefixed by >>)

   lib/livepatch/test_klp_atomic_replace.c:46:14: sparse: no member 'replace' in struct klp_patch
>> lib/livepatch/test_klp_atomic_replace.c:46:14: sparse: generating address of non-lvalue (8)
   lib/livepatch/test_klp_atomic_replace.c: In function 'test_klp_atomic_replace_init':
   lib/livepatch/test_klp_atomic_replace.c:46:7: error: 'struct klp_patch' has no member named 'replace'
     patch.replace = replace;
          ^
--
   lib/livepatch/test_klp_callbacks_demo2.c:81:14: sparse: no member 'replace' in struct klp_patch
>> lib/livepatch/test_klp_callbacks_demo2.c:81:14: sparse: generating address of non-lvalue (8)
   lib/livepatch/test_klp_callbacks_demo2.c: In function 'test_klp_callbacks_demo2_init':
   lib/livepatch/test_klp_callbacks_demo2.c:81:7: error: 'struct klp_patch' has no member named 'replace'
     patch.replace = replace;
          ^
--
   lib/livepatch/test_klp_shadow_vars.c:72:38: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:72:38: sparse: got ctor
   lib/livepatch/test_klp_shadow_vars.c:76:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:76:9: sparse: got "001"
>> lib/livepatch/test_klp_shadow_vars.c:79:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:79:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:79:16: sparse: got ret
   lib/livepatch/test_klp_shadow_vars.c:80:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:80:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:88:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:88:9: sparse: got "001"
   lib/livepatch/test_klp_shadow_vars.c:91:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:91:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:91:16: sparse: got ret
   lib/livepatch/test_klp_shadow_vars.c:92:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:92:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:97:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:97:9: sparse: got "001"
   lib/livepatch/test_klp_shadow_vars.c:99:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:99:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:104:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:104:9: sparse: got "001"
   lib/livepatch/test_klp_shadow_vars.c:106:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:106:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:114:9: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:114:9: sparse: got "001"
   lib/livepatch/test_klp_shadow_vars.c:117:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:117:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:117:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:118:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:118:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:124:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:124:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:138:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:138:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:139:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:139:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:140:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:140:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:141:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:141:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:142:16: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:142:16: sparse: got &
   lib/livepatch/test_klp_shadow_vars.c:149:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:149:13: sparse: got !
>> lib/livepatch/test_klp_shadow_vars.c:149:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:164:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:164:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:164:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:168:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:168:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:168:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:172:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:172:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:172:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:182:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:182:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:182:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:192:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:192:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:192:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:195:25: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:195:25: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:197:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:197:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:197:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:200:25: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:200:25: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:202:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:202:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:202:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:209:17: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:209:17: sparse: got ==
   lib/livepatch/test_klp_shadow_vars.c:209:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:216:28: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:216:28: sparse: got +
   lib/livepatch/test_klp_shadow_vars.c:218:13: sparse: Expected ) in function declarator
   lib/livepatch/test_klp_shadow_vars.c:218:13: sparse: got !
   lib/livepatch/test_klp_shadow_vars.c:218:9: sparse: Trying to use reserved word 'if' as identifier
   lib/livepatch/test_klp_shadow_vars.c:224:9: sparse: Trying to use reserved word 'return' as identifier
   lib/livepatch/test_klp_shadow_vars.c:224:16: sparse: Expected ; at end of declaration
   lib/livepatch/test_klp_shadow_vars.c:224:16: sparse: got 0
   lib/livepatch/test_klp_shadow_vars.c:225:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:225:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:231:1: sparse: Expected ; at the end of type declaration
   lib/livepatch/test_klp_shadow_vars.c:231:1: sparse: got }
   lib/livepatch/test_klp_shadow_vars.c:113:23: sparse: undefined identifier 'ctor_data'
   lib/livepatch/test_klp_shadow_vars.c:148:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:148:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
   lib/livepatch/test_klp_shadow_vars.c:155:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:155:9: sparse: symbol 'sv1' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:156:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:156:9: sparse: symbol 'sv2' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:157:28: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:157:9: sparse: symbol 'sv3' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:134) - different base types
   lib/livepatch/test_klp_shadow_vars.c:163:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:163:9: sparse: symbol 'ret' has multiple initializers (originally initialized at lib/livepatch/test_klp_shadow_vars.c:148)
   lib/livepatch/test_klp_shadow_vars.c:163:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
   lib/livepatch/test_klp_shadow_vars.c:167:26: sparse: undefined identifier 'obj'
   lib/livepatch/test_klp_shadow_vars.c:167:9: sparse: symbol 'ret' has multiple initializers (originally initialized at lib/livepatch/test_klp_shadow_vars.c:163)
   lib/livepatch/test_klp_shadow_vars.c:167:9: sparse: symbol 'ret' redeclared with different type (originally declared at lib/livepatch/test_klp_shadow_vars.c:136) - different base types
>> lib/livepatch/test_klp_shadow_vars.c:171:26: sparse: too many errors
   lib/livepatch/test_klp_shadow_vars.c:72:6: error: unknown type name 'klp_shadow_ctor_t'
         klp_shadow_ctor_t ctor, void *ctor_data)
         ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c:83:23: error: unknown type name 'klp_shadow_ctor_t'
         gfp_t gfp_flags, klp_shadow_ctor_t ctor,
                          ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c:94:47: error: unknown type name 'klp_shadow_dtor_t'
    void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
                                                  ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c:101:40: error: unknown type name 'klp_shadow_dtor_t'
    void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
                                           ^~~~~~~~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c: In function 'test_klp_shadow_vars_init':
   lib/livepatch/test_klp_shadow_vars.c:155:8: error: implicit declaration of function 'shadow_alloc'; did you mean 'shadow_dtor'? [-Werror=implicit-function-declaration]
     sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
           ^~~~~~~~~~~~
           shadow_dtor
   lib/livepatch/test_klp_shadow_vars.c:155:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
         ^
   lib/livepatch/test_klp_shadow_vars.c:156:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
         ^
   lib/livepatch/test_klp_shadow_vars.c:157:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
         ^
   lib/livepatch/test_klp_shadow_vars.c:180:8: error: implicit declaration of function 'shadow_get_or_alloc'; did you mean 'klp_shadow_get_or_alloc'? [-Werror=implicit-function-declaration]
     sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
           ^~~~~~~~~~~~~~~~~~~
           klp_shadow_get_or_alloc
   lib/livepatch/test_klp_shadow_vars.c:180:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
         ^
   lib/livepatch/test_klp_shadow_vars.c:181:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
         ^
   lib/livepatch/test_klp_shadow_vars.c:190:2: error: implicit declaration of function 'shadow_free'; did you mean 'shadow_get'? [-Werror=implicit-function-declaration]
     shadow_free(obj, id, shadow_dtor);   /* sv1 */
     ^~~~~~~~~~~
     shadow_get
   lib/livepatch/test_klp_shadow_vars.c:216:2: error: implicit declaration of function 'shadow_free_all'; did you mean 'klp_shadow_free_all'? [-Werror=implicit-function-declaration]
     shadow_free_all(id + 1, shadow_dtor);   /* sv3 */
     ^~~~~~~~~~~~~~~
     klp_shadow_free_all
   In file included from lib/livepatch/test_klp_shadow_vars.c:6:0:
   lib/livepatch/test_klp_shadow_vars.c: At top level:
   include/linux/module.h:130:42: error: redefinition of '__inittest'
     static inline initcall_t __maybe_unused __inittest(void)  151-                                          ^
   lib/livepatch/test_klp_shadow_vars.c:232:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_exit);
    ^~~~~~~~~~~
   include/linux/module.h:130:42: note: previous definition of '__inittest' was here
     static inline initcall_t __maybe_unused __inittest(void)  157-                                          ^
   lib/livepatch/test_klp_shadow_vars.c:231:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_init);
    ^~~~~~~~~~~
   lib/livepatch/test_klp_shadow_vars.c: In function '__inittest':
   lib/livepatch/test_klp_shadow_vars.c:232:13: error: return from incompatible pointer type [-Werror=incompatible-pointer-types]
    module_init(test_klp_shadow_vars_exit);
                ^
   include/linux/module.h:131:11: note: in definition of macro 'module_init'
     { return initfn; }     167-           ^~~~~~
   lib/livepatch/test_klp_shadow_vars.c: At top level:
   include/linux/module.h:132:6: error: redefinition of 'init_module'
     int init_module(void) __attribute__((alias(#initfn)));
         ^
   lib/livepatch/test_klp_shadow_vars.c:232:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_exit);
    ^~~~~~~~~~~
   include/linux/module.h:132:6: note: previous definition of 'init_module' was here
     int init_module(void) __attribute__((alias(#initfn)));
         ^
   lib/livepatch/test_klp_shadow_vars.c:231:1: note: in expansion of macro 'module_init'
    module_init(test_klp_shadow_vars_init);
    ^~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/klp_shadow_ctor_t +72 lib/livepatch/test_klp_shadow_vars.c

    70	
    71	void *shadow_alloc(void *obj, unsigned long id, size_t size, gfp_t gfp_flags,
  > 72			   klp_shadow_ctor_t ctor, void *ctor_data)
    73	{
    74		void *ret = klp_shadow_alloc(obj, id, size, gfp_flags, ctor,
    75					     ctor_data);
    76		pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
    77			__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
    78			ptr_id(ctor_data), ptr_id(ret));
  > 79		return ret;
    80	}
    81	
    82	void *shadow_get_or_alloc(void *obj, unsigned long id, size_t size,
    83				  gfp_t gfp_flags, klp_shadow_ctor_t ctor,
    84				  void *ctor_data)
    85	{
    86		void *ret = klp_shadow_get_or_alloc(obj, id, size, gfp_flags, ctor,
    87						    ctor_data);
    88		pr_info("klp_%s(obj=PTR%d, id=0x%lx, size=%zx, gfp_flags=%pGg), ctor=PTR%d, ctor_data=PTR%d = PTR%d\n",
    89			__func__, ptr_id(obj), id, size, &gfp_flags, ptr_id(ctor),
    90			ptr_id(ctor_data), ptr_id(ret));
    91		return ret;
    92	}
    93	
  > 94	void shadow_free(void *obj, unsigned long id, klp_shadow_dtor_t dtor)
    95	{
    96		klp_shadow_free(obj, id, dtor);
    97		pr_info("klp_%s(obj=PTR%d, id=0x%lx, dtor=PTR%d)\n",
    98			__func__, ptr_id(obj), id, ptr_id(dtor));
    99	}
   100	
 > 101	void shadow_free_all(unsigned long id, klp_shadow_dtor_t dtor)
   102	{
   103		klp_shadow_free_all(id, dtor);
   104		pr_info("klp_%s(id=0x%lx, dtor=PTR%d)\n",
   105			__func__, id, ptr_id(dtor));
   106	}
   107	
   108	
   109	/* Shadow variable constructor - remember simple pointer data */
   110	static int shadow_ctor(void *obj, void *shadow_data, void *ctor_data)
   111	{
   112		int **shadow_int = shadow_data;
   113		*shadow_int = ctor_data;
   114		pr_info("%s: PTR%d -> PTR%d\n",
   115			__func__, ptr_id(shadow_int), ptr_id(ctor_data));
   116	
   117		return 0;
   118	}
   119	
   120	static void shadow_dtor(void *obj, void *shadow_data)
   121	{
   122		pr_info("%s(obj=PTR%d, shadow_data=PTR%d)\n",
   123			__func__, ptr_id(obj), ptr_id(shadow_data));
   124	}
   125	
   126	static int test_klp_shadow_vars_init(void)
   127	{
   128		void *obj			= THIS_MODULE;
   129		int id			= 0x1234;
   130		size_t size		= sizeof(int *);
   131		gfp_t gfp_flags		= GFP_KERNEL;
   132	
   133		int var1, var2, var3, var4;
   134		int **sv1, **sv2, **sv3, **sv4;
   135	
   136		void *ret;
   137	
   138		ptr_id(0);
 > 139		ptr_id(&var1);
   140		ptr_id(&var2);
   141		ptr_id(&var3);
   142		ptr_id(&var4);
   143	
   144		/*
   145		 * With an empty shadow variable hash table, expect not to find
   146		 * any matches.
   147		 */
   148		ret = shadow_get(obj, id);
 > 149		if (!ret)
   150			pr_info("  got expected NULL result\n");
   151	
   152		/*
   153		 * Allocate a few shadow variables with different <obj> and <id>.
   154		 */
 > 155		sv1 = shadow_alloc(obj, id, size, gfp_flags, shadow_ctor, &var1);
 > 156		sv2 = shadow_alloc(obj + 1, id, size, gfp_flags, shadow_ctor, &var2);
 > 157		sv3 = shadow_alloc(obj, id + 1, size, gfp_flags, shadow_ctor, &var3);
   158	
   159		/*
   160		 * Verify we can find our new shadow variables and that they point
   161		 * to expected data.
   162		 */
   163		ret = shadow_get(obj, id);
   164		if (ret == sv1 && *sv1 == &var1)
   165			pr_info("  got expected PTR%d -> PTR%d result\n",
   166				ptr_id(sv1), ptr_id(*sv1));
 > 167		ret = shadow_get(obj + 1, id);
   168		if (ret == sv2 && *sv2 == &var2)
   169			pr_info("  got expected PTR%d -> PTR%d result\n",
   170				ptr_id(sv2), ptr_id(*sv2));
 > 171		ret = shadow_get(obj, id + 1);
   172		if (ret == sv3 && *sv3 == &var3)
   173			pr_info("  got expected PTR%d -> PTR%d result\n",
   174				ptr_id(sv3), ptr_id(*sv3));
   175	
   176		/*
   177		 * Allocate or get a few more, this time with the same <obj>, <id>.
   178		 * The second invocation should return the same shadow var.
   179		 */
 > 180		sv4 = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
 > 181		ret = shadow_get_or_alloc(obj + 2, id, size, gfp_flags, shadow_ctor, &var4);
   182		if (ret == sv4 && *sv4 == &var4)
   183			pr_info("  got expected PTR%d -> PTR%d result\n",
   184				ptr_id(sv4), ptr_id(*sv4));
   185	
   186		/*
   187		 * Free the <obj=*, id> shadow variables and check that we can no
   188		 * longer find them.
   189		 */
 > 190		shadow_free(obj, id, shadow_dtor);			/* sv1 */
   191		ret = shadow_get(obj, id);
   192		if (!ret)
   193			pr_info("  got expected NULL result\n");
   194	
   195		shadow_free(obj + 1, id, shadow_dtor);			/* sv2 */
   196		ret = shadow_get(obj + 1, id);
   197		if (!ret)
   198			pr_info("  got expected NULL result\n");
   199	
   200		shadow_free(obj + 2, id, shadow_dtor);			/* sv4 */
   201		ret = shadow_get(obj + 2, id);
   202		if (!ret)
   203			pr_info("  got expected NULL result\n");
   204	
   205		/*
   206		 * We should still find an <id+1> variable.
   207		 */
   208		ret = shadow_get(obj, id + 1);
   209		if (ret == sv3 && *sv3 == &var3)
   210			pr_info("  got expected PTR%d -> PTR%d result\n",
   211				ptr_id(sv3), ptr_id(*sv3));
   212	
   213		/*
   214		 * Free all the <id+1> variables, too.
   215		 */
 > 216		shadow_free_all(id + 1, shadow_dtor);			/* sv3 */
   217		ret = shadow_get(obj, id);
   218		if (!ret)
   219			pr_info("  shadow_get() got expected NULL result\n");
   220	
   221	
   222		free_ptr_list();
   223	
   224		return 0;
   225	}
   226	
   227	static void test_klp_shadow_vars_exit(void)
   228	{
   229	}
   230	
 > 231	module_init(test_klp_shadow_vars_init);
 > 232	module_init(test_klp_shadow_vars_exit);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 62852 bytes --]

[PATCH v2] selftests/livepatch: introduce tests

[joe.lawrence]

On 04/10/2018 11:44 PM, kbuild test robot wrote:
> Hi Joe,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on v4.16]
> [also build test ERROR on next-20180410]
> [cannot apply to linus/master jikos-livepatching/for-next]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
                                   ^^^^^^^^^^^^^^
Hi kbuild test robot,

Thank you for testing!  Yet something to improve:

Is there syntax one can add to a commit, or better yet, patchset cover
letter to specify a git tree URL in which the patch(set) is based on?

I can't find anything at [1] that documents such feature.

[1] https://01.org/lkp/documentation/0-day-test-service

Thanks,

-- Joe
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[PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

On 04/10/2018 11:44 PM, kbuild test robot wrote:
> Hi Joe,
> 
> Thank you for the patch! Yet something to improve:
> 
> [auto build test ERROR on v4.16]
> [also build test ERROR on next-20180410]
> [cannot apply to linus/master jikos-livepatching/for-next]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
                                   ^^^^^^^^^^^^^^
Hi kbuild test robot,

Thank you for testing!  Yet something to improve:

Is there syntax one can add to a commit, or better yet, patchset cover
letter to specify a git tree URL in which the patch(set) is based on?

I can't find anything at [1] that documents such feature.

[1] https://01.org/lkp/documentation/0-day-test-service

Thanks,

-- Joe
--
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the body of a message to majordomo at vger.kernel.org
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[philip.li]

On Wed, Apr 11, 2018 at 09:59:59AM -0400, Joe Lawrence wrote:
> On 04/10/2018 11:44 PM, kbuild test robot wrote:
> > Hi Joe,
> > 
> > Thank you for the patch! Yet something to improve:
> > 
> > [auto build test ERROR on v4.16]
> > [also build test ERROR on next-20180410]
> > [cannot apply to linus/master jikos-livepatching/for-next]
> > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>                                    ^^^^^^^^^^^^^^
> Hi kbuild test robot,
> 
> Thank you for testing!  Yet something to improve:
> 
> Is there syntax one can add to a commit, or better yet, patchset cover
> letter to specify a git tree URL in which the patch(set) is based on?
thanks Joe, currently we recommend to use --base option when using git format-patch.
This will record the base of your series, and 0day would act accordingly to apply
to that base.

> 
> I can't find anything at [1] that documents such feature.
> 
> [1] https://01.org/lkp/documentation/0-day-test-service
> 
> Thanks,
> 
> -- Joe
> _______________________________________________
> kbuild-all mailing list
> kbuild-all at lists.01.org
> https://lists.01.org/mailman/listinfo/kbuild-all
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[Philip Li]

On Wed, Apr 11, 2018@09:59:59AM -0400, Joe Lawrence wrote:
> On 04/10/2018 11:44 PM, kbuild test robot wrote:
> > Hi Joe,
> > 
> > Thank you for the patch! Yet something to improve:
> > 
> > [auto build test ERROR on v4.16]
> > [also build test ERROR on next-20180410]
> > [cannot apply to linus/master jikos-livepatching/for-next]
> > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>                                    ^^^^^^^^^^^^^^
> Hi kbuild test robot,
> 
> Thank you for testing!  Yet something to improve:
> 
> Is there syntax one can add to a commit, or better yet, patchset cover
> letter to specify a git tree URL in which the patch(set) is based on?
thanks Joe, currently we recommend to use --base option when using git format-patch.
This will record the base of your series, and 0day would act accordingly to apply
to that base.

> 
> I can't find anything at [1] that documents such feature.
> 
> [1] https://01.org/lkp/documentation/0-day-test-service
> 
> Thanks,
> 
> -- Joe
> _______________________________________________
> kbuild-all mailing list
> kbuild-all at lists.01.org
> https://lists.01.org/mailman/listinfo/kbuild-all
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[joe.lawrence]

On 04/13/2018 11:49 AM, Philip Li wrote:
> On Wed, Apr 11, 2018 at 09:59:59AM -0400, Joe Lawrence wrote:
>> On 04/10/2018 11:44 PM, kbuild test robot wrote:
>>> Hi Joe,
>>>
>>> Thank you for the patch! Yet something to improve:
>>>
>>> [auto build test ERROR on v4.16]
>>> [also build test ERROR on next-20180410]
>>> [cannot apply to linus/master jikos-livepatching/for-next]
>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>                                    ^^^^^^^^^^^^^^
>> Hi kbuild test robot,
>>
>> Thank you for testing!  Yet something to improve:
>>
>> Is there syntax one can add to a commit, or better yet, patchset cover
>> letter to specify a git tree URL in which the patch(set) is based on?
> thanks Joe, currently we recommend to use --base option when using git format-patch.
> This will record the base of your series, and 0day would act accordingly to apply
> to that base.

I didn't know about the --base option, that looks like a cool feature.
BTW, I assume that "well-known patches" would apply to those posted to
any upstream mailing list that the kbuild test robot is currently
listening to?

-- Joe
--
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the body of a message to majordomo at vger.kernel.org
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[Joe Lawrence]

On 04/13/2018 11:49 AM, Philip Li wrote:
> On Wed, Apr 11, 2018@09:59:59AM -0400, Joe Lawrence wrote:
>> On 04/10/2018 11:44 PM, kbuild test robot wrote:
>>> Hi Joe,
>>>
>>> Thank you for the patch! Yet something to improve:
>>>
>>> [auto build test ERROR on v4.16]
>>> [also build test ERROR on next-20180410]
>>> [cannot apply to linus/master jikos-livepatching/for-next]
>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>                                    ^^^^^^^^^^^^^^
>> Hi kbuild test robot,
>>
>> Thank you for testing!  Yet something to improve:
>>
>> Is there syntax one can add to a commit, or better yet, patchset cover
>> letter to specify a git tree URL in which the patch(set) is based on?
> thanks Joe, currently we recommend to use --base option when using git format-patch.
> This will record the base of your series, and 0day would act accordingly to apply
> to that base.

I didn't know about the --base option, that looks like a cool feature.
BTW, I assume that "well-known patches" would apply to those posted to
any upstream mailing list that the kbuild test robot is currently
listening to?

-- Joe
--
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the body of a message to majordomo at vger.kernel.org
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[xiaolong.ye]

On 04/13, Joe Lawrence wrote:
>On 04/13/2018 11:49 AM, Philip Li wrote:
>> On Wed, Apr 11, 2018 at 09:59:59AM -0400, Joe Lawrence wrote:
>>> On 04/10/2018 11:44 PM, kbuild test robot wrote:
>>>> Hi Joe,
>>>>
>>>> Thank you for the patch! Yet something to improve:
>>>>
>>>> [auto build test ERROR on v4.16]
>>>> [also build test ERROR on next-20180410]
>>>> [cannot apply to linus/master jikos-livepatching/for-next]
>>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>>                                    ^^^^^^^^^^^^^^
>>> Hi kbuild test robot,
>>>
>>> Thank you for testing!  Yet something to improve:
>>>
>>> Is there syntax one can add to a commit, or better yet, patchset cover
>>> letter to specify a git tree URL in which the patch(set) is based on?
>> thanks Joe, currently we recommend to use --base option when using git format-patch.
>> This will record the base of your series, and 0day would act accordingly to apply
>> to that base.
>
>I didn't know about the --base option, that looks like a cool feature.
>BTW, I assume that "well-known patches" would apply to those posted to
>any upstream mailing list that the kbuild test robot is currently
>listening to?

Yes, as 0day monitors most of maintainers' and core kernel developers' trees
that contain those "well known" patches. 

Thanks,
Xiaolong
>
>-- Joe
>_______________________________________________
>kbuild-all mailing list
>kbuild-all at lists.01.org
>https://lists.01.org/mailman/listinfo/kbuild-all
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[kbuild-all] [PATCH v2] selftests/livepatch: introduce tests

[Ye Xiaolong]

On 04/13, Joe Lawrence wrote:
>On 04/13/2018 11:49 AM, Philip Li wrote:
>> On Wed, Apr 11, 2018@09:59:59AM -0400, Joe Lawrence wrote:
>>> On 04/10/2018 11:44 PM, kbuild test robot wrote:
>>>> Hi Joe,
>>>>
>>>> Thank you for the patch! Yet something to improve:
>>>>
>>>> [auto build test ERROR on v4.16]
>>>> [also build test ERROR on next-20180410]
>>>> [cannot apply to linus/master jikos-livepatching/for-next]
>>>> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>>>                                    ^^^^^^^^^^^^^^
>>> Hi kbuild test robot,
>>>
>>> Thank you for testing!  Yet something to improve:
>>>
>>> Is there syntax one can add to a commit, or better yet, patchset cover
>>> letter to specify a git tree URL in which the patch(set) is based on?
>> thanks Joe, currently we recommend to use --base option when using git format-patch.
>> This will record the base of your series, and 0day would act accordingly to apply
>> to that base.
>
>I didn't know about the --base option, that looks like a cool feature.
>BTW, I assume that "well-known patches" would apply to those posted to
>any upstream mailing list that the kbuild test robot is currently
>listening to?

Yes, as 0day monitors most of maintainers' and core kernel developers' trees
that contain those "well known" patches. 

Thanks,
Xiaolong
>
>-- Joe
>_______________________________________________
>kbuild-all mailing list
>kbuild-all at lists.01.org
>https://lists.01.org/mailman/listinfo/kbuild-all
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Re: [PATCH v2] Add livepatch kselftests

[Josh Poimboeuf]

On Tue, Apr 10, 2018 at 11:15:53AM -0400, Joe Lawrence wrote:
> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

Don't split it up on my account.  We can just merge this one shortly
after.

-- 
Josh

[PATCH v2] Add livepatch kselftests

[Josh Poimboeuf]

On Tue, Apr 10, 2018@11:15:53AM -0400, Joe Lawrence wrote:
> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

Don't split it up on my account.  We can just merge this one shortly
after.

-- 
Josh
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[PATCH v2] Add livepatch kselftests

[jpoimboe]

On Tue, Apr 10, 2018 at 11:15:53AM -0400, Joe Lawrence wrote:
> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

Don't split it up on my account.  We can just merge this one shortly
after.

-- 
Josh
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Re: [PATCH v2] Add livepatch kselftests

[Miroslav Benes]

> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

What Josh said. If we merge it almost together, there is no need to split 
it.
 
>   - I didn't remove any of the sample modules.  If anyone thinks any of
>     them should go, let me know.  They serve as nice, simple examples so
>     I thought they should all stay.

Ok

>   - Module naming convention: to make the test script easier to grep
>     module names and filenames, I broke with livepatch convention and
>     used underscores instead of dashes.  I didn't think it worth the
>     regex foo to flip back and forth in the test script.

Ok

Miroslav

[PATCH v2] Add livepatch kselftests

[Miroslav Benes]

> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

What Josh said. If we merge it almost together, there is no need to split 
it.
 
>   - I didn't remove any of the sample modules.  If anyone thinks any of
>     them should go, let me know.  They serve as nice, simple examples so
>     I thought they should all stay.

Ok

>   - Module naming convention: to make the test script easier to grep
>     module names and filenames, I broke with livepatch convention and
>     used underscores instead of dashes.  I didn't think it worth the
>     regex foo to flip back and forth in the test script.

Ok

Miroslav
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[PATCH v2] Add livepatch kselftests

[mbenes]

> Questions for v3:
> 
>   - Should we split off the atomic replace and shadow variable update
>     tests so that the this patchset could be merged before the ones
>     listed above?

What Josh said. If we merge it almost together, there is no need to split 
it.
 
>   - I didn't remove any of the sample modules.  If anyone thinks any of
>     them should go, let me know.  They serve as nice, simple examples so
>     I thought they should all stay.

Ok

>   - Module naming convention: to make the test script easier to grep
>     module names and filenames, I broke with livepatch convention and
>     used underscores instead of dashes.  I didn't think it worth the
>     regex foo to flip back and forth in the test script.

Ok

Miroslav
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