Re: [PATCH] x86: suppress KMSAN reports in arch_within_stack_frames()

[Eric Biggers]

On Fri, Nov 18, 2022 at 06:23:05PM +0100, Alexander Potapenko wrote:
> 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.
> 
> Link: https://github.com/google/kmsan/issues/89
> Link: https://lore.kernel.org/lkml/Y3b9AAEKp2Vr3e6O@sol.localdomain/
> Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
> ---
>  arch/x86/include/asm/thread_info.h | 5 +++++
>  1 file changed, 5 insertions(+)

Tested-by: Eric Biggers <ebiggers@xxxxxxxxxx>

- Eric