linux-kernel - Re: [PATCH 3/9] drm/i915/selftests: Annotate struct perf_series with __counted

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Message-ID: <7ad534fe-3494-9915-1663-a3aafcb41b0e@embeddedor.com>
Date:   Fri, 22 Sep 2023 20:14:52 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
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Subject: Re: [PATCH 3/9] drm/i915/selftests: Annotate struct perf_series with
 __counted_by



On 9/22/23 11:32, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct perf_series.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: John Harrison <john.c.harrison@...el.com>
> Cc: Andi Shyti <andi.shyti@...ux.intel.com>
> Cc: Matthew Brost <matthew.brost@...el.com>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/gpu/drm/i915/selftests/i915_request.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c
> index a9b79888c193..acae30a04a94 100644
> --- a/drivers/gpu/drm/i915/selftests/i915_request.c
> +++ b/drivers/gpu/drm/i915/selftests/i915_request.c
> @@ -1924,7 +1924,7 @@ struct perf_stats {
>   struct perf_series {
>   	struct drm_i915_private *i915;
>   	unsigned int nengines;
> -	struct intel_context *ce[];
> +	struct intel_context *ce[] __counted_by(nengines);
>   };
>   
>   static int cmp_u32(const void *A, const void *B)