linux-hardening - Re: [PATCH 9/9] drm/v3d: Annotate struct v3d_perfmon with __counted

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Date: Thu, 28 Sep 2023 12:16:16 -0300
From: Maira Canal <mcanal@...lia.com>
To: Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc: Tejas Upadhyay <tejas.upadhyay@...el.com>, Emma Anholt <emma@...olt.net>,
 Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev,
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 Hawking Zhang <Hawking.Zhang@....com>
Subject: Re: [PATCH 9/9] drm/v3d: Annotate struct v3d_perfmon with
 __counted_by

Hi Kees,

On 9/22/23 14:32, 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 v3d_perfmon.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Emma Anholt <emma@...olt.net>
> Cc: Melissa Wen <mwen@...lia.com>
> Cc: David Airlie <airlied@...il.com>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Maíra Canal <mcanal@...lia.com>

Best Regards,
- Maíra

> ---
>   drivers/gpu/drm/v3d/v3d_drv.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
> index 7f664a4b2a75..106454f28956 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.h
> +++ b/drivers/gpu/drm/v3d/v3d_drv.h
> @@ -59,7 +59,7 @@ struct v3d_perfmon {
>   	 * values can't be reset, but you can fake a reset by
>   	 * destroying the perfmon and creating a new one.
>   	 */
> -	u64 values[];
> +	u64 values[] __counted_by(ncounters);
>   };
>   
>   struct v3d_dev {