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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id b11-20020a170902bd4b00b001b80d411e5bsm321679plx.253.2023.08.17.16.58.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Aug 2023 16:58:59 -0700 (PDT) From: Kees Cook To: Vinod Koul Cc: Kees Cook , Ludovic Desroches , Tudor Ambarus , linux-arm-kernel@lists.infradead.org, dmaengine@vger.kernel.org, Hector Martin , Sven Peter , Alyssa Rosenzweig , Lars-Peter Clausen , Zhou Wang , Jie Hai , Andy Gross , Bjorn Andersson , Konrad Dybcio , Green Wan , Orson Zhai , Baolin Wang , Chunyan Zhang , Patrice Chotard , Maxime Coquelin , Alexandre Torgue , Laxman Dewangan , Jon Hunter , Thierry Reding , Peter Ujfalusi , Kunihiko Hayashi , Masami Hiramatsu , Yu Kuai , Greg Kroah-Hartman , Jordy Zomer , Jernej Skrabec , Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, asahi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-tegra@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH 02/21] dmaengine: at_hdmac: Annotate struct at_desc with __counted_by Date: Thu, 17 Aug 2023 16:58:39 -0700 Message-Id: <20230817235859.49846-2-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230817235428.never.111-kees@kernel.org> References: <20230817235428.never.111-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1276; i=keescook@chromium.org; h=from:subject; bh=SO00/SVjajGCjMuuFq3x36eZ74YbXa362Z0gVVwiDDw=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBk3rQ/kwZ89vekQ7nYJW/uV4J4wjHF2gtaDeshJ sKago9defuJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZN60PwAKCRCJcvTf3G3A JupcD/9gAzNiJxWx0uRQfD8T+IaYgnkOkhA4OeFx0IvrNeaLb+tCwUyZvaX4ej/wqzimsKMVdqN CZ7pm1PRURyuu8lT0h7rMGwnNlSY/Fen1jGDiML3J8cWz8KNQRJ51BExzo+6AT5p0bMm+MVN/II HE0/LhRNnfMXBsO5G3lvR9n6ztqEMfvBemm6L6Ez3Z7GFjJOsIlsDsSkhh8X6iQ/6HIajeJHyqj YvBYLRhif3iT0VlhntKObmx24rvGafjzDG2R2gjbTqeo88HSSizrbRwRfHivP3nbfmfohE2L6zn 05qPcvXimafgX5XNsUoCKx6oZ676UVrb2Sz0On9nXxipvtx+CNc4qmXay7LEg99oYchShYD5rby XbfSNVh1byswNNiD4YUbANAh4lqhvoGZE7sv59b7Dh1q+qz9O4CfSpKswtIL/MQI+97t+xjrFlo XqNhdhiedIKgCFWsEcs2qAUbEhNB3fWfmt/fbuiz2e9pKuxIDuRxWhdcw/mry12LuNrHYERNQx2 4B7UtAX+oTPF7O+ZImJkKGxpAg9QBwY8EmtDZ3B0Cz8BOmD4nAPSjbLQOfrFeNqnrPqO+EavE+n CR+pldV/gAtaU9XLFVNZcbJ3gPMcPG2oyaFK7y+26z4RP63O6+Si8YIQTl7TvMnoAYkDuWawIBl n8BIWx5jtvwp0JQ== 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 at_desc. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul Cc: Ludovic Desroches Cc: Tudor Ambarus Cc: linux-arm-kernel@lists.infradead.org Cc: dmaengine@vger.kernel.org Signed-off-by: Kees Cook --- drivers/dma/at_hdmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index b2876f67471f..b66c7f416881 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -239,7 +239,7 @@ struct at_desc { bool memset_buffer; dma_addr_t memset_paddr; int *memset_vaddr; - struct atdma_sg sg[]; + struct atdma_sg sg[] __counted_by(sglen); }; /*-- Channels --------------------------------------------------------*/