linux-kernel - [PATCH 7/9] drm/virtio: Annotate struct virtio_gpu_object_array with __counted

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Message-Id: <20230922173216.3823169-7-keescook@chromium.org>
Date:   Fri, 22 Sep 2023 10:32:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Airlie <airlied@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        David Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        Emma Anholt <emma@...olt.net>, Evan Quan <evan.quan@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
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        Huang Rui <ray.huang@....com>,
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Subject: [PATCH 7/9] drm/virtio: Annotate struct virtio_gpu_object_array 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 virtio_gpu_object_array.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: David Airlie <airlied@...hat.com>
Cc: Gerd Hoffmann <kraxel@...hat.com>
Cc: Gurchetan Singh <gurchetansingh@...omium.org>
Cc: Chia-I Wu <olvaffe@...il.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org
Cc: virtualization@...ts.linux-foundation.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 8513b671f871..96365a772f77 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -119,7 +119,7 @@ struct virtio_gpu_object_array {
 	struct ww_acquire_ctx ticket;
 	struct list_head next;
 	u32 nents, total;
-	struct drm_gem_object *objs[];
+	struct drm_gem_object *objs[] __counted_by(total);
 };
 
 struct virtio_gpu_vbuffer;
-- 
2.34.1