linux-kernel - Re: [PATCH 0/9] drm: Annotate structs with __counted

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Message-ID: <CADnq5_Ma2CrLYggJHKFEObsNmUoqJwb2p1xai5DfL=m43U6zEA@mail.gmail.com>
Date:   Mon, 2 Oct 2023 11:06:19 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian König <ckoenig.leichtzumerken@...il.com>
Cc:     Kees Cook <keescook@...omium.org>,
        David Airlie <airlied@...il.com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Karol Herbst <kherbst@...hat.com>, Tom Rix <trix@...hat.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        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>,
        Evan Quan <evan.quan@....com>, Emma Anholt <emma@...olt.net>,
        amd-gfx@...ts.freedesktop.org,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Lijo Lazar <lijo.lazar@....com>,
        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>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Chia-I Wu <olvaffe@...il.com>, llvm@...ts.linux.dev,
        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>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Nathan Chancellor <nathan@...nel.org>, Le Ma <le.ma@....com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Maxime Ripard <mripard@...nel.org>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        virtualization@...ts.linux-foundation.org,
        Sean Paul <sean@...rly.run>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Xiaojian Du <Xiaojian.Du@....com>, Lang Yu <Lang.Yu@....com>,
        Bjorn Andersson <andersson@...nel.org>,
        Tejas Upadhyay <tejas.upadhyay@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org,
        Hawking Zhang <Hawking.Zhang@....com>,
        Rob Clark <robdclark@...il.com>, Melissa Wen <mwen@...lia.com>,
        John Harrison <john.c.harrison@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>,
        Nirmoy Das <nirmoy.das@...el.com>,
        freedreno@...ts.freedesktop.org,
        Christian König <christian.koenig@....com>,
        Zack Rusin <zackr@...are.com>, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 0/9] drm: Annotate structs with __counted_by

On Mon, Oct 2, 2023 at 5:20 AM Christian König
<ckoenig.leichtzumerken@...il.com> wrote:
>
> Am 29.09.23 um 21:33 schrieb Kees Cook:
> > On Fri, 22 Sep 2023 10:32:05 -0700, Kees Cook wrote:
> >> This is a batch of patches touching drm for preparing 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 to structs that would
> >> benefit from the annotation.
> >>
> >> [...]
> > Since this got Acks, I figure I should carry it in my tree. Let me know
> > if this should go via drm instead.
> >
> > Applied to for-next/hardening, thanks!
> >
> > [1/9] drm/amd/pm: Annotate struct smu10_voltage_dependency_table with __counted_by
> >        https://git.kernel.org/kees/c/a6046ac659d6
>
> STOP! In a follow up discussion Alex and I figured out that this won't work.
>
> The value in the structure is byte swapped based on some firmware
> endianness which not necessary matches the CPU endianness.

SMU10 is APU only so the endianess of the SMU firmware and the CPU
will always match.

Alex

>
> Please revert that one from going upstream if it's already on it's way.
>
> And because of those reasons I strongly think that patches like this
> should go through the DRM tree :)
>
> Regards,
> Christian.
>
> > [2/9] drm/amdgpu/discovery: Annotate struct ip_hw_instance with __counted_by
> >        https://git.kernel.org/kees/c/4df33089b46f
> > [3/9] drm/i915/selftests: Annotate struct perf_series with __counted_by
> >        https://git.kernel.org/kees/c/ffd3f823bdf6
> > [4/9] drm/msm/dpu: Annotate struct dpu_hw_intr with __counted_by
> >        https://git.kernel.org/kees/c/2de35a989b76
> > [5/9] drm/nouveau/pm: Annotate struct nvkm_perfdom with __counted_by
> >        https://git.kernel.org/kees/c/188aeb08bfaa
> > [6/9] drm/vc4: Annotate struct vc4_perfmon with __counted_by
> >        https://git.kernel.org/kees/c/59a54dc896c3
> > [7/9] drm/virtio: Annotate struct virtio_gpu_object_array with __counted_by
> >        https://git.kernel.org/kees/c/5cd476de33af
> > [8/9] drm/vmwgfx: Annotate struct vmw_surface_dirty with __counted_by
> >        https://git.kernel.org/kees/c/b426f2e5356a
> > [9/9] drm/v3d: Annotate struct v3d_perfmon with __counted_by
> >        https://git.kernel.org/kees/c/dc662fa1b0e4
> >
> > Take care,
> >
>