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

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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>
Cc: David Airlie <airlied@...il.com>,
 Tejas Upadhyay <tejas.upadhyay@...el.com>, Emma Anholt <emma@...olt.net>,
 Tom Rix <trix@...hat.com>, llvm@...ts.linux.dev,
 dri-devel@...ts.freedesktop.org, Chris Wilson <chris@...is-wilson.co.uk>,
 Prike Liang <Prike.Liang@....com>, Huang Rui <ray.huang@....com>,
 Gerd Hoffmann <kraxel@...hat.com>, Andrzej Hajda <andrzej.hajda@...el.com>,
 Marijn Suijten <marijn.suijten@...ainline.org>,
 Matthew Brost <matthew.brost@...el.com>, Karol Herbst <kherbst@...hat.com>,
 Neil Armstrong <neil.armstrong@...aro.org>, amd-gfx@...ts.freedesktop.org,
 Kuogee Hsieh <quic_khsieh@...cinc.com>, Nathan Chancellor
 <nathan@...nel.org>,
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 <dmitry.baryshkov@...aro.org>, Gurchetan Singh
 <gurchetansingh@...omium.org>, Maxime Ripard <mripard@...nel.org>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Evan Quan <evan.quan@....com>,
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 <tvrtko.ursulin@...ux.intel.com>, Xiaojian Du <Xiaojian.Du@....com>,
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 Bjorn Andersson <andersson@...nel.org>, "Pan, Xinhui" <Xinhui.Pan@....com>,
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 Lang Yu <Lang.Yu@....com>, John Harrison <john.c.harrison@...el.com>,
 Hawking Zhang <Hawking.Zhang@....com>
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
>>