Re: [PATCH v4 08/45] kmsan: mark noinstr as __no_sanitize_memory

[Marco Elver]

On Fri, 1 Jul 2022 at 16:23, Alexander Potapenko <glider@xxxxxxxxxx> wrote:
>
> noinstr functions should never be instrumented, so make KMSAN skip them
> by applying the __no_sanitize_memory attribute.
>
> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>

Reviewed-by: Marco Elver <elver@xxxxxxxxxx>

> ---
> v2:
>  -- moved this patch earlier in the series per Mark Rutland's request
>
> Link: https://linux-review.googlesource.com/id/I3c9abe860b97b49bc0c8026918b17a50448dec0d
> ---
>  include/linux/compiler_types.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
> index d08dfcb0ac687..fb5777e5228e7 100644
> --- a/include/linux/compiler_types.h
> +++ b/include/linux/compiler_types.h
> @@ -227,7 +227,8 @@ struct ftrace_likely_data {
>  /* Section for code which can't be instrumented at all */
>  #define noinstr                                                                \
>         noinline notrace __attribute((__section__(".noinstr.text")))    \
> -       __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
> +       __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \
> +       __no_sanitize_memory
>
>  #endif /* __KERNEL__ */
>
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>