linux-hardening - [PATCH 1/9] drm/amd/pm: Annotate struct smu10_voltage_dependency_table with __counted

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Message-Id: <20230922173216.3823169-1-keescook@chromium.org>
Date: Fri, 22 Sep 2023 10:32:06 -0700
From: Kees Cook <keescook@...omium.org>
To: David Airlie <airlied@...il.com>
Cc: Kees Cook <keescook@...omium.org>,
	Evan Quan <evan.quan@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	"Pan, Xinhui" <Xinhui.Pan@....com>,
	Daniel Vetter <daniel@...ll.ch>,
	Xiaojian Du <Xiaojian.Du@....com>,
	Huang Rui <ray.huang@....com>,
	Kevin Wang <kevin1.wang@....com>,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	Emma Anholt <emma@...olt.net>,
	Hawking Zhang <Hawking.Zhang@....com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
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Subject: [PATCH 1/9] drm/amd/pm: Annotate struct smu10_voltage_dependency_table 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 smu10_voltage_dependency_table.

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

Cc: Evan Quan <evan.quan@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: "Pan, Xinhui" <Xinhui.Pan@....com>
Cc: David Airlie <airlied@...il.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Xiaojian Du <Xiaojian.Du@....com>
Cc: Huang Rui <ray.huang@....com>
Cc: Kevin Wang <kevin1.wang@....com>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.h b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.h
index 808e0ecbe1f0..42adc2a3dcbc 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.h
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu10_hwmgr.h
@@ -192,7 +192,7 @@ struct smu10_clock_voltage_dependency_record {
 
 struct smu10_voltage_dependency_table {
 	uint32_t count;
-	struct smu10_clock_voltage_dependency_record entries[];
+	struct smu10_clock_voltage_dependency_record entries[] __counted_by(count);
 };
 
 struct smu10_clock_voltage_information {
-- 
2.34.1