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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, 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>, VMware Graphics Reviewers <linux-graphics-maintainer@...are.com>, Ben Skeggs <bskeggs@...hat.com>, Andi Shyti <andi.shyti@...ux.intel.com>, nouveau@...ts.freedesktop.org, David Airlie <airlied@...hat.com>, virtualization@...ts.linux-foundation.org, linux-hardening@...r.kernel.org, Lijo Lazar <lijo.lazar@....com>, Yifan Zhang <yifan1.zhang@....com>, linux-arm-msm@...r.kernel.org, intel-gfx@...ts.freedesktop.org, Kevin Wang <kevin1.wang@....com>, Abhinav Kumar <quic_abhinavk@...cinc.com>, Melissa Wen <mwen@...lia.com>, 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 > >> >
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