[PATCH 8/9] drm/vmwgfx: Annotate struct vmw_surface_dirty with __counted_by
Gustavo A. R. Silva
gustavo at embeddedor.com
Sat Sep 23 02:37:09 UTC 2023
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 at vmware.com>
> Cc: VMware Graphics Reviewers <linux-graphics-maintainer at vmware.com>
> Cc: David Airlie <airlied at gmail.com>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Kees Cook <keescook at chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars at kernel.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);
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