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Date:   Fri, 22 Sep 2023 20:13:25 -0600
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Subject: Re: [PATCH 1/9] drm/amd/pm: Annotate struct
 smu10_voltage_dependency_table with __counted_by
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To:     Kees Cook <keescook@chromium.org>, David Airlie <airlied@gmail.com>
Cc:     Evan Quan <evan.quan@amd.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>,
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References: <20230922173110.work.084-kees@kernel.org>
 <20230922173216.3823169-1-keescook@chromium.org>
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
In-Reply-To: <20230922173216.3823169-1-keescook@chromium.org>
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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
> 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@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
> Cc: David Airlie <airlied@gmail.com>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Xiaojian Du <Xiaojian.Du@amd.com>
> Cc: Huang Rui <ray.huang@amd.com>
> Cc: Kevin Wang <kevin1.wang@amd.com>
> Cc: amd-gfx@lists.freedesktop.org
> Cc: dri-devel@lists.freedesktop.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

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

Thanks
-- 
Gustavo


> ---
>   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 {