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

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Date:   Fri, 22 Sep 2023 10:32:14 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Airlie <airlied@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, Emma Anholt <emma@...olt.net>,
        Melissa Wen <mwen@...lia.com>, Daniel Vetter <daniel@...ll.ch>,
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        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
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Subject: [PATCH 9/9] drm/v3d: Annotate struct v3d_perfmon with __counted_by

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>
---
 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 {
-- 
2.34.1