linux-hardening - Re: [PATCH 5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom with __counted

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Date: Fri, 22 Sep 2023 20:15:58 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc: Ben Skeggs <bskeggs@...hat.com>, Karol Herbst <kherbst@...hat.com>,
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Subject: Re: [PATCH 5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom 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 nvkm_perfdom.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Ben Skeggs <bskeggs@...hat.com>
> Cc: Karol Herbst <kherbst@...hat.com>
> Cc: Lyude Paul <lyude@...hat.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: nouveau@...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/nouveau/nvkm/engine/pm/priv.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> index 6ae25d3e7f45..c011227f7052 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> +++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
> @@ -82,7 +82,7 @@ struct nvkm_perfdom {
>   	u8  mode;
>   	u32 clk;
>   	u16 signal_nr;
> -	struct nvkm_perfsig signal[];
> +	struct nvkm_perfsig signal[] __counted_by(signal_nr);
>   };
>   
>   struct nvkm_funcdom {