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

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Message-ID: <CADnq5_P1tg2-rWUmsRAy3aPJLT7ZmaZORMSOrPa6t6oSc5xS3g@mail.gmail.com>
Date: Mon, 25 Sep 2023 10:07:27 -0400
From: Alex Deucher <alexdeucher@...il.com>
To: Christian König <christian.koenig@....com>
Cc: Kees Cook <keescook@...omium.org>, 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, 
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	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>, 
	VMware Graphics Reviewers <linux-graphics-maintainer@...are.com>, Ben Skeggs <bskeggs@...hat.com>, 
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	Dmitry Baryshkov <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>, Sean Paul <sean@...rly.run>, 
	Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>, Xiaojian Du <Xiaojian.Du@....com>, 
	Le Ma <le.ma@....com>, freedreno@...ts.freedesktop.org, 
	Bjorn Andersson <andersson@...nel.org>, "Pan, Xinhui" <Xinhui.Pan@....com>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, linux-kernel@...r.kernel.org, 
	Alex Deucher <alexander.deucher@....com>, Nirmoy Das <nirmoy.das@...el.com>, 
	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

On Mon, Sep 25, 2023 at 2:30 AM Christian König
<christian.koenig@....com> wrote:
>
> 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.

True. Good point.  Same for the other amdgpu patch.

Alex

>
> 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
> >>
>