x86: Suppress KMSAN reports in arch_within_stack_frames()

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arch_within_stack_frames() performs stack walking and may confuse
KMSAN by stepping on stale shadow values. To prevent false positive
reports, disable KMSAN checks in this function.

This fixes KMSAN's interoperability with CONFIG_HARDENED_USERCOPY.

Signed-off-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Eric Biggers <ebiggers@google.com>
Link: https://github.com/google/kmsan/issues/89
Link: https://lore.kernel.org/lkml/Y3b9AAEKp2Vr3e6O@sol.localdomain/
Link: https://lore.kernel.org/all/20221118172305.3321253-1-glider%40google.com

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Alexander Potapenko 2022-11-18 18:23:05 +01:00 • committed by Dave Hansen

parent 6be9a8f18f

commit ce3ba2af96

1 changed files with 5 additions and 0 deletions

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arch/x86/include/asm/thread_info.h

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