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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id u7-20020a170902e80700b001b9e9f191f2sm342824plg.15.2023.08.17.16.59.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Aug 2023 16:59:03 -0700 (PDT) From: Kees Cook To: Vinod Koul Cc: Kees Cook , dmaengine@vger.kernel.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 , 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-kernel@lists.infradead.org, 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 08/21] dmaengine: sa11x0: Annotate struct sa11x0_dma_desc with __counted_by Date: Thu, 17 Aug 2023 16:58:45 -0700 Message-Id: <20230817235859.49846-8-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=2230; i=keescook@chromium.org; h=from:subject; bh=xRJQQKdAwogb4vqWXbK3omVk8LQ2U1Kgbhap9AYkMvo=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBk3rRAxAkVjLsoroU7aJkr1WgWWzRBzbsR+tdxD lgeTVdiQveJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZN60QAAKCRCJcvTf3G3A JspMD/9uCbBEkWVx4Whm0SjF91ZUEjFm+uw5va5kJYSQaUggli1PUAzEbtIfkqE0tHxpXylvHV6 MZAMbsTTMc4sB4m4xnYRc0EoTzuMdduuaXj7l/sncv7/LmFSoowcBNgOyqPORRYUM775TWDHeXO KeoIqOfRBA1pU2p6SABeK4PvYr9w3rZRX+aZiNFriijmZlDDlbGfeq8v9uQ2Im17NvWmo78uSnB OkH0/Si61oGt8YkSxwx3WwhmqB2o702deHwP3SlOa/ZeqfTijE2YZhDmMuKHYx7QeBfC/eMcUiR Z5Ir99EHJYfiOQtN+yLXwoR+0SaqDwlthzf36cY91M4+RIxRUpoV7xLXmq2q4GCAdnuZf61znzs M6Bidmh9xg6pqyHEGPynCNRRpn/UsrhseCWdJGYMQZLkXP2bP0VJzaHIlfivSURYMQVXc4KQwBd DRji9b/iiSnnLi3fSIhaQxYXT5+Ps4Au0oZl5ksmYDaMky5nRGOgwaH8K/PsnaL2g5HvZnClItG bdITH1ZZpfW22BCSxjF6WLtrNaQQQACl25/pjzcUllaIN1ntJsfEnFtqBBzeDv+cMihyO6Z99a5 Kmn4lAvlEhqg16rC1j3EkD7ZrTt+gPUQteXqDvYw1UUclntbSMql5Tik8DK4sYfnwMmbaR4qWIx Q6tm80uQco8mfqw== 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 sa11x0_dma_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: dmaengine@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- drivers/dma/sa11x0-dma.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/dma/sa11x0-dma.c b/drivers/dma/sa11x0-dma.c index a29c13cae716..e5849622f198 100644 --- a/drivers/dma/sa11x0-dma.c +++ b/drivers/dma/sa11x0-dma.c @@ -78,7 +78,7 @@ struct sa11x0_dma_desc { bool cyclic; unsigned sglen; - struct sa11x0_dma_sg sg[]; + struct sa11x0_dma_sg sg[] __counted_by(sglen); }; struct sa11x0_dma_phy; @@ -558,6 +558,7 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg( dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); return NULL; } + txd->sglen = j; j = 0; for_each_sg(sg, sgent, sglen, i) { @@ -593,7 +594,6 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg( txd->ddar = c->ddar; txd->size = size; - txd->sglen = j; dev_dbg(chan->device->dev, "vchan %p: txd %p: size %zu nr %u\n", &c->vc, &txd->vd, txd->size, txd->sglen); @@ -628,6 +628,7 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic( dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); return NULL; } + txd->sglen = sglen; for (i = k = 0; i < size / period; i++) { size_t tlen, len = period; @@ -653,7 +654,6 @@ static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic( txd->ddar = c->ddar; txd->size = size; - txd->sglen = sglen; txd->cyclic = 1; txd->period = sgperiod;