linux-hardening - Re: [PATCH 8/9] drm/vmwgfx: Annotate struct vmw_surface_dirty with __counted

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Message-ID: <9aa42b20-4388-4954-012f-65e3bc99b7f0@embeddedor.com>
Date: Fri, 22 Sep 2023 20:37:09 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, David Airlie <airlied@...il.com>
Cc: Zack Rusin <zackr@...are.com>,
 VMware Graphics Reviewers <linux-graphics-maintainer@...are.com>,
 Daniel Vetter <daniel@...ll.ch>, dri-devel@...ts.freedesktop.org,
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Subject: Re: [PATCH 8/9] drm/vmwgfx: Annotate struct vmw_surface_dirty 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 vmw_surface_dirty.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Zack Rusin <zackr@...are.com>
> Cc: VMware Graphics Reviewers <linux-graphics-maintainer@...are.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: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> index 5db403ee8261..2d1d857f99ae 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
> @@ -77,7 +77,7 @@ struct vmw_surface_offset {
>   struct vmw_surface_dirty {
>   	struct vmw_surface_cache cache;
>   	u32 num_subres;
> -	SVGA3dBox boxes[];
> +	SVGA3dBox boxes[] __counted_by(num_subres);
>   };
>   
>   static void vmw_user_surface_free(struct vmw_resource *res);