From: Kees Cook <keescook@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kees Cook <keescook@chromium.org>,
Prasad Sodagudi <psodagud@codeaurora.org>,
Sami Tolvanen <samitolvanen@google.com>,
Amit Daniel Kachhap <amit.kachhap@arm.com>,
linux-kselftest@vger.kernel.org,
clang-built-linux@googlegroups.com, linux-kernel@vger.kernel.org
Subject: [PATCH 4/4] lkdtm: Make arch-specific tests always available
Date: Fri, 29 May 2020 13:03:47 -0700 [thread overview]
Message-ID: <20200529200347.2464284-5-keescook@chromium.org> (raw)
In-Reply-To: <20200529200347.2464284-1-keescook@chromium.org>
I'd like arch-specific tests to XFAIL when on a mismatched architecture
so that we can more easily compare test coverage across all systems.
Lacking kernel configs or CPU features count as a FAIL, not an XFAIL.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/misc/lkdtm/bugs.c | 34 ++++++++++++++-----------
drivers/misc/lkdtm/lkdtm.h | 2 --
tools/testing/selftests/lkdtm/tests.txt | 1 +
3 files changed, 20 insertions(+), 17 deletions(-)
diff --git a/drivers/misc/lkdtm/bugs.c b/drivers/misc/lkdtm/bugs.c
index e1b43f615549..f3fde0759f2c 100644
--- a/drivers/misc/lkdtm/bugs.c
+++ b/drivers/misc/lkdtm/bugs.c
@@ -453,38 +453,42 @@ void lkdtm_DOUBLE_FAULT(void)
#endif
}
-#ifdef CONFIG_ARM64_PTR_AUTH
+#ifdef CONFIG_ARM64
static noinline void change_pac_parameters(void)
{
- /* Reset the keys of current task */
- ptrauth_thread_init_kernel(current);
- ptrauth_thread_switch_kernel(current);
+ if (IS_ENABLED(CONFIG_ARM64_PTR_AUTH)) {
+ /* Reset the keys of current task */
+ ptrauth_thread_init_kernel(current);
+ ptrauth_thread_switch_kernel(current);
+ }
}
+#endif
-#define CORRUPT_PAC_ITERATE 10
noinline void lkdtm_CORRUPT_PAC(void)
{
+#ifdef CONFIG_ARM64
+#define CORRUPT_PAC_ITERATE 10
int i;
+ if (!IS_ENABLED(CONFIG_ARM64_PTR_AUTH))
+ pr_err("FAIL: kernel not built with CONFIG_ARM64_PTR_AUTH\n");
+
if (!system_supports_address_auth()) {
- pr_err("FAIL: arm64 pointer authentication feature not present\n");
+ pr_err("FAIL: CPU lacks pointer authentication feature\n");
return;
}
- pr_info("Change the PAC parameters to force function return failure\n");
+ pr_info("changing PAC parameters to force function return failure...\n");
/*
- * Pac is a hash value computed from input keys, return address and
+ * PAC is a hash value computed from input keys, return address and
* stack pointer. As pac has fewer bits so there is a chance of
* collision, so iterate few times to reduce the collision probability.
*/
for (i = 0; i < CORRUPT_PAC_ITERATE; i++)
change_pac_parameters();
- pr_err("FAIL: %s test failed. Kernel may be unstable from here\n", __func__);
-}
-#else /* !CONFIG_ARM64_PTR_AUTH */
-noinline void lkdtm_CORRUPT_PAC(void)
-{
- pr_err("FAIL: arm64 pointer authentication config disabled\n");
-}
+ pr_err("FAIL: survived PAC changes! Kernel may be unstable from here\n");
+#else
+ pr_err("XFAIL: this test is arm64-only\n");
#endif
+}
diff --git a/drivers/misc/lkdtm/lkdtm.h b/drivers/misc/lkdtm/lkdtm.h
index 601a2156a0d4..8878538b2c13 100644
--- a/drivers/misc/lkdtm/lkdtm.h
+++ b/drivers/misc/lkdtm/lkdtm.h
@@ -31,9 +31,7 @@ void lkdtm_CORRUPT_USER_DS(void);
void lkdtm_STACK_GUARD_PAGE_LEADING(void);
void lkdtm_STACK_GUARD_PAGE_TRAILING(void);
void lkdtm_UNSET_SMEP(void);
-#ifdef CONFIG_X86_32
void lkdtm_DOUBLE_FAULT(void);
-#endif
void lkdtm_CORRUPT_PAC(void);
/* lkdtm_heap.c */
diff --git a/tools/testing/selftests/lkdtm/tests.txt b/tools/testing/selftests/lkdtm/tests.txt
index 92ca32143ae5..9d266e79c6a2 100644
--- a/tools/testing/selftests/lkdtm/tests.txt
+++ b/tools/testing/selftests/lkdtm/tests.txt
@@ -14,6 +14,7 @@ STACK_GUARD_PAGE_LEADING
STACK_GUARD_PAGE_TRAILING
UNSET_SMEP CR4 bits went missing
DOUBLE_FAULT
+CORRUPT_PAC
UNALIGNED_LOAD_STORE_WRITE
#OVERWRITE_ALLOCATION Corrupts memory on failure
#WRITE_AFTER_FREE Corrupts memory on failure
--
2.25.1
next prev parent reply other threads:[~2020-05-29 20:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-29 20:03 [PATCH drivers/misc 0/4] lkdtm: Various clean ups Kees Cook
2020-05-29 20:03 ` [PATCH 1/4] lkdtm: Avoid more compiler optimizations for bad writes Kees Cook
2020-05-29 20:10 ` Nick Desaulniers
2020-05-29 20:03 ` [PATCH 2/4] lkdtm/heap: Avoid edge and middle of slabs Kees Cook
2020-05-29 20:03 ` [PATCH 3/4] selftests/lkdtm: Reset WARN_ONCE to avoid false negatives Kees Cook
2020-05-29 20:22 ` Shuah Khan
2020-05-29 20:03 ` Kees Cook [this message]
2020-06-23 23:10 ` [PATCH drivers/misc 0/4] lkdtm: Various clean ups Kees Cook
2020-06-23 23:32 ` Randy Dunlap
2020-06-24 0:01 ` Kees Cook
2020-06-24 7:23 ` Richard Weinberger
2020-06-24 20:36 ` Kees Cook
2020-06-24 21:29 ` Randy Dunlap
2020-06-24 22:01 ` Richard Weinberger
2020-06-24 22:23 ` Randy Dunlap
2020-06-24 22:35 ` Randy Dunlap
2020-06-25 1:45 ` Randy Dunlap
2020-06-25 6:06 ` Kees Cook
2020-06-25 6:24 ` Richard Weinberger
2020-06-25 15:24 ` Randy Dunlap
2020-06-24 6:13 ` Greg Kroah-Hartman
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