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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id z16-20020aa785d0000000b00682a8e600f0sm317127pfn.35.2023.08.17.16.59.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Aug 2023 16:59:08 -0700 (PDT) From: Kees Cook To: Vinod Koul Cc: Kees Cook , Maxime Coquelin , Alexandre Torgue , dmaengine@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Hector Martin , Sven Peter , Alyssa Rosenzweig , Ludovic Desroches , Tudor Ambarus , Lars-Peter Clausen , Zhou Wang , Jie Hai , Andy Gross , Bjorn Andersson , Konrad Dybcio , Green Wan , Orson Zhai , Baolin Wang , Chunyan Zhang , Patrice Chotard , 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-tegra@vger.kernel.org, llvm@lists.linux.dev, linux-hardening@vger.kernel.org Subject: [PATCH 13/21] dmaengine: stm32-mdma: Annotate struct stm32_mdma_desc with __counted_by Date: Thu, 17 Aug 2023 16:58:50 -0700 Message-Id: <20230817235859.49846-13-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=1846; i=keescook@chromium.org; h=from:subject; bh=qxPmilAAIkLoOYICjRkX4cjKcAjqE7CQu+wWoaP3kts=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBk3rRBiikOng0Pfopo+sTAW7rtw4RZgr55AKvYH ziP0G2svk6JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZN60QQAKCRCJcvTf3G3A JkzQEACx/KvF+wEb76F6NHodgtyBW5Bo96EDbaR+uzQ1M+6MkoJ+z5QX375uyUt/2CSiohYitZE 3k9R5DImexGGnDErX1pyh0O54lVFZh4trqFmrjlIRP5MN1o00A+aPOY5fBOappLuZYEvZPIImN/ bkNgwNZlVFH5giEHSpJo3q24BT/VtqNjlOT6gb4ZATrfFUS7m5trL8xe0bW/JduIhqBt0u2Ce61 +P1AkdS0k/0ZmbnTf84lcr3/BMXf0orJ6GdhIIhxq6Ee2MTFmWQbQvsi8r/LlmKlwXfWtwsnuNW 7XH33IQQiKv7pTeV31N6Vn+Gz9G8rv0DMiS4KbLN451Vn+KQrXTljf7wE/hPct5E+yWNpKk83L/ YHOWq9nvagB+yvrBBa0rcA3Gc8nEckvDx6pTmtntal/BEcG+ZLwjf9s7Gj7I6V2qKtdfHXMhHv8 PX7jTwRf+V+jIJs3dTWZDmLWvRY1ydelSG4tFuR9LL+XMPV6tRJ4czS5VhRYZ3YCYi44H1w7jPl REwibv6UXxwafopUJ2UvHkguL07fha0L/4qVQI/RYIhUf2IXo9AdRcsgnXBaHA2eyY+wj2YEqqD hplXqLsFgvg+xjjNJ4/LWnRcqYy/nyVPy0WQNubxImH9dS2lT0g+cZu5wOL9gLZyxvZGJ5p3frE 3FY7s8aJWg4iKHg== 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 stm32_mdma_desc. Additionally, since the element count member must be set before accessing the annotated flexible array member, move its initialization earlier. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul Cc: Maxime Coquelin Cc: Alexandre Torgue Cc: dmaengine@vger.kernel.org Cc: linux-stm32@st-md-mailman.stormreply.com Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- drivers/dma/stm32-mdma.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 0de234022c6d..926d6ecf1274 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -224,7 +224,7 @@ struct stm32_mdma_desc { u32 ccr; bool cyclic; u32 count; - struct stm32_mdma_desc_node node[]; + struct stm32_mdma_desc_node node[] __counted_by(count); }; struct stm32_mdma_dma_config { @@ -321,6 +321,7 @@ static struct stm32_mdma_desc *stm32_mdma_alloc_desc( desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT); if (!desc) return NULL; + desc->count = count; for (i = 0; i < count; i++) { desc->node[i].hwdesc = @@ -330,8 +331,6 @@ static struct stm32_mdma_desc *stm32_mdma_alloc_desc( goto err; } - desc->count = count; - return desc; err: