linux-kernel - [PATCH 5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom with __counted

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Message-Id: <20230922173216.3823169-5-keescook@chromium.org>
Date:   Fri, 22 Sep 2023 10:32:10 -0700
From:   Kees Cook <keescook@...omium.org>
To:     David Airlie <airlied@...il.com>
Cc:     Kees Cook <keescook@...omium.org>, Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
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        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Xiaojian Du <Xiaojian.Du@....com>,
        Huang Rui <ray.huang@....com>,
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        Hawking Zhang <Hawking.Zhang@....com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
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Subject: [PATCH 5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom 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 nvkm_perfdom.

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

Cc: Ben Skeggs <bskeggs@...hat.com>
Cc: Karol Herbst <kherbst@...hat.com>
Cc: Lyude Paul <lyude@...hat.com>
Cc: David Airlie <airlied@...il.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org
Cc: nouveau@...ts.freedesktop.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
index 6ae25d3e7f45..c011227f7052 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/pm/priv.h
@@ -82,7 +82,7 @@ struct nvkm_perfdom {
 	u8  mode;
 	u32 clk;
 	u16 signal_nr;
-	struct nvkm_perfsig signal[];
+	struct nvkm_perfsig signal[] __counted_by(signal_nr);
 };
 
 struct nvkm_funcdom {
-- 
2.34.1