Re: [PATCH 6/9] drm/vc4: Annotate struct vc4_perfmon with __counted_by

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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

As found with Coccinelle[1], add __counted_by for struct vc4_perfmon.


Cc: Emma Anholt <emma@xxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

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


  drivers/gpu/drm/vc4/vc4_drv.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index bf66499765fb..ab61e96e7e14 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -76,7 +76,7 @@ struct vc4_perfmon {
  	 * Note that counter values can't be reset, but you can fake a reset by
  	 * destroying the perfmon and creating a new one.
-	u64 counters[];
+	u64 counters[] __counted_by(ncounters);
struct vc4_dev {

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