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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id a11-20020a17090abe0b00b00271c5811019sm3479258pjs.38.2023.09.22.10.32.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Sep 2023 10:32:22 -0700 (PDT) From: Kees Cook To: David Airlie Cc: Kees Cook , Emma Anholt , Maxime Ripard , Daniel Vetter , dri-devel@lists.freedesktop.org, Evan Quan , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , "Pan, Xinhui" , Xiaojian Du , Huang Rui , Kevin Wang , Hawking Zhang , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Chris Wilson , John Harrison , Andi Shyti , Matthew Brost , Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , Bjorn Andersson , Ben Skeggs , Karol Herbst , Lyude Paul , David Airlie , Gerd Hoffmann , Gurchetan Singh , Chia-I Wu , Zack Rusin , VMware Graphics Reviewers , Melissa Wen , Nathan Chancellor , Nick Desaulniers , Tom Rix , Le Ma , Lijo Lazar , Yifan Zhang , Prike Liang , Lang Yu , Tejas Upadhyay , Nirmoy Das , Andrzej Hajda , Neil Armstrong , Kuogee Hsieh , linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, nouveau@lists.freedesktop.org, virtualization@lists.linux-foundation.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH 6/9] drm/vc4: Annotate struct vc4_perfmon with __counted_by Date: Fri, 22 Sep 2023 10:32:11 -0700 Message-Id: <20230922173216.3823169-6-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230922173110.work.084-kees@kernel.org> References: <20230922173110.work.084-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1277; i=keescook@chromium.org; h=from:subject; bh=4ERTESaqnYz8ImDqyHPyzXy0AuquVom9vq+hq0gy89g=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlDc+eg2zdwhFFl6K23RVdCG+VU9OV+t2/BviGN QnAc1heAtyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZQ3PngAKCRCJcvTf3G3A JvO0D/4+c0QkeKEEEd/HWEG0VvFv4kIlOeqfDMOPwJ1QkN1jVwlbiQVdn9lWjRgUq77jqzdpagc 0e9qirU7jL0cbTe+JOBsFEQkZYwnIV0EUxV5Wb9g3csLF1vPRQafhR8984UzEKRtulAS9kQTSMT xYBkkYy+pbMJZNux38iCGgJFdWD057RPEazeM0Aatd5kaNk0HGNFRG/lz7HPcD9XIged7BCjFe4 O5fJlM/WnYAAAK2cZn9AtONFzhR65gyQwb4pt0CXxC/kBS6pb6GBT8V9AsVWH8zu6CsMIVjafAT OdJEF/tJGI7jp48gN51zXgv1VAdOAJOLBc/kciYavjyryrGgXYANueMuiXx+r42kxUG0yZkO3/X uq+N33+UiId1hMftODv6WGPcCbwFJtgAfev1bfSRgKYiKQyjWPcbW5NPGeYVKKsvsew1qqGZWpN ASd96EwnB4kIHBeIp1k14aTdlgBVRePuuE2Vrf/gjb9uTNMh605/Yq2hNu83sG0S0fKskR2pH6r /VbQ9GYa6Dm3r4bYE6S0RRzMROjl3MXFBv4R99QF1UUF4V4iGgkcUUE3tdB+iCxIW1I5SuGR620 4ajKmF3Z9xPkw56NlVdKBjnhCKGSlHNQv+Rh5xh0IeFJzR6f8SO8/u45ADDZHCkCqxoc7tiLP68 zupfltyyH8r66bw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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 vc4_perfmon. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Emma Anholt Cc: Maxime Ripard Cc: David Airlie Cc: Daniel Vetter Cc: dri-devel@lists.freedesktop.org Signed-off-by: Kees Cook --- drivers/gpu/drm/vc4/vc4_drv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index bf66499765fb..ab61e96e7e14 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -76,7 +76,7 @@ struct vc4_perfmon { * Note that counter values can't be reset, but you can fake a reset by * destroying the perfmon and creating a new one. */ - u64 counters[]; + u64 counters[] __counted_by(ncounters); }; struct vc4_dev {