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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id a23-20020a656417000000b005898c8caee3sm1648955pgv.30.2023.10.06.13.17.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Oct 2023 13:17:46 -0700 (PDT) From: Kees Cook To: Jani Nikula Cc: Kees Cook , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter , "Gustavo A. R. Silva" , John Harrison , Matthew Brost , Michal Wajdeczko , Matt Roper , intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-hardening@vger.kernel.org, Nathan Chancellor , Nick Desaulniers , Tom Rix , Andi Shyti , Nirmoy Das , Jonathan Cavitt , Fei Yang , linux-kernel@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH] drm/i915/guc: Annotate struct ct_incoming_msg with __counted_by Date: Fri, 6 Oct 2023 13:17:45 -0700 Message-Id: <20231006201744.work.135-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1706; i=keescook@chromium.org; h=from:subject:message-id; bh=hfOPKMbt1kpgmTXk+IkFUv+LIQHu3WxQ85BLA+j39zk=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlIGtoRE75uVdefxFjupuMMe0I9OTzEzXxNkbpt Mqtn/fIxmuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZSBraAAKCRCJcvTf3G3A JsbYEACIjnXC26TRyjqe/0XWkVlFq8iUwQznZxL2nYr71KqzJo7xxRVqvbDairu1uyWkYlykJY1 kzgJsioAawovDGi2WulfUyJJz+El41D1UlndyRYdC51Cd5QQBOyD3c8o9VvGFuESblrrl4NSvSy 3m3RtEpfHAf2jD06tgBw+JDlLyNSUA9xbUf7CpCZwb6ii/JBNo6LwdbfC0s3PhT+DCjc1KEJBru f1D/ILZwWFEOzjiUQrRqlI3knZeHJNX/naWBjHRCQ06a3k03bxBwLrEOVUaJTEfouhXMQ/e0Vyw L8WPx4oAmc2jZktsESGFsciiAMduhLe1Pg+kNMFKeRhK7HZGoPkWBU6bTSdW81Za4g/eiZ/Wn06 dnS24kWZENnfXtCkJhTUVO9gvpt+55FECMcTrpbC514WTeNhLxdEm+VCxucKdwyu5ESU82wsNDF XReLmc/Xq4yADXdU2p7jtMbNnGSd2LOploXFLd49VU8MSVuTbC+xMIXEga+cfVe3WGRzMLGqJGB cxKbEz8P7g+kp4k7wITnztl62lr3/mnTn5EYu2kkMXKPGIppa4h6rJ0KfCGu0vqMtNRmpCxO47K 1v3sG/hPAcXC91EScYf5WstnOgdVKZvXShDQ0I7beJ6/+MpM4EBeY5CmZ85YUrxS5a+uafYPqms EE3Lf0b zByqJ28g== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit 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 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 ct_incoming_msg. Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Tvrtko Ursulin Cc: David Airlie Cc: Daniel Vetter Cc: "Gustavo A. R. Silva" Cc: John Harrison Cc: Matthew Brost Cc: Michal Wajdeczko Cc: Matt Roper Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: linux-hardening@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook --- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c index 6e22af31513a..c33210ead1ef 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -96,7 +96,7 @@ struct ct_request { struct ct_incoming_msg { struct list_head link; u32 size; - u32 msg[]; + u32 msg[] __counted_by(size); }; enum { CTB_SEND = 0, CTB_RECV = 1 }; -- 2.34.1