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Message-ID: <2635922e-f52a-4e91-40c6-4f1358972786@amd.com>
Date: Mon, 25 Sep 2023 08:30:30 +0200
From: Christian König <christian.koenig@....com>
To: Alex Deucher <alexdeucher@...il.com>,
Kees Cook <keescook@...omium.org>
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Subject: Re: [PATCH 1/9] drm/amd/pm: Annotate struct
smu10_voltage_dependency_table with __counted_by
Am 22.09.23 um 19:41 schrieb Alex Deucher:
> On Fri, Sep 22, 2023 at 1:32 PM Kees Cook <keescook@...omium.org> 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@....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>
> Acked-by: Alex Deucher <alexander.deucher@....com>
Mhm, I'm not sure if this is a good idea. That is a structure filled in
by the firmware, isn't it?
That would imply that we might need to byte swap count before it is
checkable.
Regards,
Christian.
>
>> ---
>> 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
>>
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