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[165.204.72.6]) by smtp.gmail.com with ESMTPSA id w21-20020a05600c015500b0040535648639sm1103836wmm.36.2023.10.05.02.42.40 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Oct 2023 02:42:43 -0700 (PDT) Message-ID: Date: Thu, 5 Oct 2023 11:42:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/9] drm: Annotate structs with __counted_by To: Kees Cook , =?UTF-8?Q?Christian_K=C3=B6nig?= Cc: Alex Deucher , David Airlie , "Pan, Xinhui" , Karol Herbst , Tom Rix , Joonas Lahtinen , dri-devel@lists.freedesktop.org, Chris Wilson , Prike Liang , Huang Rui , Gerd Hoffmann , Andrzej Hajda , Marijn Suijten , Matthew Brost , Evan Quan , Emma Anholt , amd-gfx@lists.freedesktop.org, Kuogee Hsieh , Lijo Lazar , VMware Graphics Reviewers , Ben Skeggs , Andi Shyti , nouveau@lists.freedesktop.org, David Airlie , Dmitry Baryshkov , Chia-I Wu , llvm@lists.linux.dev, Yifan Zhang , linux-arm-msm@vger.kernel.org, intel-gfx@lists.freedesktop.org, Kevin Wang , Abhinav Kumar , Jani Nikula , Tvrtko Ursulin , Nathan Chancellor , Le Ma , Gurchetan Singh , Maxime Ripard , Rodrigo Vivi , virtualization@lists.linux-foundation.org, Sean Paul , Neil Armstrong , Xiaojian Du , Lang Yu , Bjorn Andersson , Tejas Upadhyay , Nick Desaulniers , linux-kernel@vger.kernel.org, Hawking Zhang , Rob Clark , Melissa Wen , John Harrison , Daniel Vetter , Alex Deucher , Nirmoy Das , freedreno@lists.freedesktop.org, Zack Rusin , linux-hardening@vger.kernel.org References: <20230922173110.work.084-kees@kernel.org> <169601600138.3014939.8511343741428844249.b4-ty@chromium.org> <83cd056c-52ae-01dd-7576-42d41da64c26@gmail.com> <202310020952.E7DE0948C0@keescook> <10644b5f-b0a7-85ef-0658-2353ee14df0d@gmail.com> <202310021107.9BB46FB8E@keescook> <0be2dfa4-b6c1-f62a-66e1-615da7aa3c76@amd.com> <202310021122.B6DA850FB0@keescook> Content-Language: en-US From: =?UTF-8?Q?Christian_K=C3=B6nig?= In-Reply-To: <202310021122.B6DA850FB0@keescook> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Am 02.10.23 um 20:22 schrieb Kees Cook: > On Mon, Oct 02, 2023 at 08:11:41PM +0200, Christian König wrote: >> Am 02.10.23 um 20:08 schrieb Kees Cook: >>> On Mon, Oct 02, 2023 at 08:01:57PM +0200, Christian König wrote: >>>> Am 02.10.23 um 18:53 schrieb Kees Cook: >>>>> On Mon, Oct 02, 2023 at 11:06:19AM -0400, Alex Deucher wrote: >>>>>> On Mon, Oct 2, 2023 at 5:20 AM Christian König >>>>>> 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. >>>>> I'm so confused; from the discussion I saw that Alex said both instances >>>>> were false positives? >>>>> >>>>>>> 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. >>>>> Which I think is what is being said here? >>>>> >>>>>>> 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 :) >>>>> Sure, that's fine -- please let me know. It was others Acked/etc. Who >>>>> should carry these patches? >>>> Probably best if the relevant maintainer pick them up individually. >>>> >>>> Some of those structures are filled in by firmware/hardware and only the >>>> maintainers can judge if that value actually matches what the compiler >>>> needs. >>>> >>>> We have cases where individual bits are used as flags or when the size is >>>> byte swapped etc... >>>> >>>> Even Alex and I didn't immediately say how and where that field is actually >>>> used and had to dig that up. That's where the confusion came from. >>> Okay, I've dropped them all from my tree. Several had Acks/Reviews, so >>> hopefully those can get picked up for the DRM tree? >> I will pick those up to go through drm-misc-next. >> >> Going to ping maintainers once more when I'm not sure if stuff is correct or >> not. > Sounds great; thanks! I wasn't 100% sure for the VC4 patch, but pushed the whole set to drm-misc-next anyway. This also means that the patches are now auto merged into the drm-tip integration branch and should any build or unit test go boom we should notice immediately and can revert it pretty easily. Thanks, Christian. > > -Kees >