* Patch "x86/pkeys/selftests: Give better unexpected fault error messages" has been added to the 4.14-stable tree
@ 2018-06-17 11:23 gregkh
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From: gregkh @ 2018-06-17 11:23 UTC (permalink / raw)
To: 20180509171338.55D13B64, akpm, alexander.levin, dave.hansen,
dave.hansen, gregkh, linux-mm, linuxram, mingo, mpe, peterz,
shuah, tglx, torvalds
Cc: stable-commits
This is a note to let you know that I've just added the patch titled
x86/pkeys/selftests: Give better unexpected fault error messages
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From foo@baz Sun Jun 17 12:13:49 CEST 2018
From: Dave Hansen <dave.hansen@linux.intel.com>
Date: Wed, 9 May 2018 10:13:38 -0700
Subject: x86/pkeys/selftests: Give better unexpected fault error messages
From: Dave Hansen <dave.hansen@linux.intel.com>
[ Upstream commit 55556b0b2016806b2e16a20b62d143383983a34a ]
do_not_expect_pk_fault() is a helper that we call when we do not expect
a PK fault to have occurred. But, it is a function, which means that
it obscures the line numbers from pkey_assert(). It also gives no
details.
Replace it with an implementation that gives nice line numbers and
also lets callers pass in a more descriptive message about what
happened that caused the unexpected fault.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellermen <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180509171338.55D13B64@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
tools/testing/selftests/x86/protection_keys.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/tools/testing/selftests/x86/protection_keys.c
+++ b/tools/testing/selftests/x86/protection_keys.c
@@ -954,10 +954,11 @@ void expected_pk_fault(int pkey)
last_si_pkey = -1;
}
-void do_not_expect_pk_fault(void)
-{
- pkey_assert(last_pkru_faults == pkru_faults);
-}
+#define do_not_expect_pk_fault(msg) do { \
+ if (last_pkru_faults != pkru_faults) \
+ dprintf0("unexpected PK fault: %s\n", msg); \
+ pkey_assert(last_pkru_faults == pkru_faults); \
+} while (0)
int test_fds[10] = { -1 };
int nr_test_fds;
@@ -1243,7 +1244,7 @@ void test_ptrace_of_child(int *ptr, u16
pkey_assert(ret != -1);
/* Now access from the current task, and expect NO exception: */
peek_result = read_ptr(plain_ptr);
- do_not_expect_pk_fault();
+ do_not_expect_pk_fault("read plain pointer after ptrace");
ret = ptrace(PTRACE_DETACH, child_pid, ignored, 0);
pkey_assert(ret != -1);
@@ -1287,7 +1288,7 @@ void test_executing_on_unreadable_memory
*/
madvise(p1, PAGE_SIZE, MADV_DONTNEED);
lots_o_noops_around_write(&scratch);
- do_not_expect_pk_fault();
+ do_not_expect_pk_fault("executing on PROT_EXEC memory");
ptr_contents = read_ptr(p1);
dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);
expected_pk_fault(pkey);
Patches currently in stable-queue which might be from dave.hansen@linux.intel.com are
queue-4.14/x86-pkeys-selftests-factor-out-instruction-page.patch
queue-4.14/x86-pkeys-selftests-fix-pointer-math.patch
queue-4.14/x86-pkeys-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-pkeys-abi.patch
queue-4.14/x86-pkeys-selftests-add-a-test-for-pkey-0.patch
queue-4.14/x86-pkeys-selftests-stop-using-assert.patch
queue-4.14/x86-pkeys-selftests-save-off-prot-for-allocations.patch
queue-4.14/x86-pkeys-selftests-remove-dead-debugging-code-fix-dprint_in_signal.patch
queue-4.14/x86-mpx-selftests-adjust-the-self-test-to-fresh-distros-that-export-the-mpx-abi.patch
queue-4.14/x86-pkeys-selftests-add-prot_exec-test.patch
queue-4.14/x86-pkeys-selftests-allow-faults-on-unknown-keys.patch
queue-4.14/x86-pkeys-selftests-give-better-unexpected-fault-error-messages.patch
queue-4.14/x86-pkeys-selftests-fix-pkey-exhaustion-test-off-by-one.patch
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2018-06-17 11:23 Patch "x86/pkeys/selftests: Give better unexpected fault error messages" has been added to the 4.14-stable tree gregkh
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