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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id l12sm4445453pff.182.2021.08.17.23.24.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:24:15 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Kalle Valo , "David S. Miller" , Jakub Kicinski , ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 45/63] ath11k: Use memset_startat() for clearing queue descriptors Date: Tue, 17 Aug 2021 23:05:15 -0700 Message-Id: <20210818060533.3569517-46-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3372; h=from:subject; bh=NQT3fqVVXi8ODh6WoJGB8sg9K5wYYHx+7JpT5FAL4cU=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMopXDUfrKda33TUBFxN6HBO6TlnPSMDcCCdRDS 0aeVcWmJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKAAKCRCJcvTf3G3AJhzGEA CY8p5TOKzJnk1TIbV+Hzc40bIrnKi3XB25slGqFlL9PC0EefG0LRY7a/kfnqj/FIFz17UsuycljRiL cACD/vfRToJ7yzKKAmxJEdfFC9iw7Xzoq9md8jDhbHG+5rEQLDA2Y8/KjGoyRoAVQUeCsHcJe+UAXU /C5fU4ck0d6s6EiIVlN7DyLPX1dt3uBgOwRyBODvNuiyvNXvhGO3XJv0FCDFCT5z75xj1tU14JGWyN PD0hj1XmCBY1e9AxpCMIlhi+/X5qb5jGTLXX/Md1KsTZvmbxvau9ABz55gWYFUQGS3X+k1Rlmv5T+v lQWqSK/nXQAlXtMjB9ywh5KsA5aVqsKNBUXndQA68SKCaNf/TyoXdI1m4yYbWg/BcAGWta/La0zhv8 6uPbEVUb8Vg2ZE5Iqlcs/ld7qL4G/K1NRERjZr+0R73esdLiYb9TgQFqKMWrJPe98lypwjAdWColpN I8cEBcItkU3uu4rF/5fh/NmOKClsPYi08PLRs5e03i6wu9s1aoaETYlf1CnhWQasVpVUQKL19q5EaQ 6mL+ds0GvKbFFnRg94o4s2GHh5vlbNIY8AZQMoUGgZ+Kclor6FXedzWgb33JBTE6JU4bg97H5xgdcx ZY2UZxJPJIziE2+vb6CbU1ZYgZ27bDV0FLUmziQd/krKAdEaAHnqHTqhCInw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Use memset_startat() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Additionally split up a later field-spanning memset() so that memset() can reason about the size. Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: ath11k@lists.infradead.org Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/wireless/ath/ath11k/hal_rx.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/hal_rx.c b/drivers/net/wireless/ath/ath11k/hal_rx.c index 325055ca41ab..0bab425f5dc9 100644 --- a/drivers/net/wireless/ath/ath11k/hal_rx.c +++ b/drivers/net/wireless/ath/ath11k/hal_rx.c @@ -29,8 +29,7 @@ static int ath11k_hal_reo_cmd_queue_stats(struct hal_tlv_hdr *tlv, FIELD_PREP(HAL_TLV_HDR_LEN, sizeof(*desc)); desc = (struct hal_reo_get_queue_stats *)tlv->value; - memset(&desc->queue_addr_lo, 0, - (sizeof(*desc) - sizeof(struct hal_reo_cmd_hdr))); + memset_startat(desc, 0, queue_addr_lo); desc->cmd.info0 &= ~HAL_REO_CMD_HDR_INFO0_STATUS_REQUIRED; if (cmd->flag & HAL_REO_CMD_FLG_NEED_STATUS) @@ -62,8 +61,7 @@ static int ath11k_hal_reo_cmd_flush_cache(struct ath11k_hal *hal, struct hal_tlv FIELD_PREP(HAL_TLV_HDR_LEN, sizeof(*desc)); desc = (struct hal_reo_flush_cache *)tlv->value; - memset(&desc->cache_addr_lo, 0, - (sizeof(*desc) - sizeof(struct hal_reo_cmd_hdr))); + memset_startat(desc, 0, cache_addr_lo); desc->cmd.info0 &= ~HAL_REO_CMD_HDR_INFO0_STATUS_REQUIRED; if (cmd->flag & HAL_REO_CMD_FLG_NEED_STATUS) @@ -101,8 +99,7 @@ static int ath11k_hal_reo_cmd_update_rx_queue(struct hal_tlv_hdr *tlv, FIELD_PREP(HAL_TLV_HDR_LEN, sizeof(*desc)); desc = (struct hal_reo_update_rx_queue *)tlv->value; - memset(&desc->queue_addr_lo, 0, - (sizeof(*desc) - sizeof(struct hal_reo_cmd_hdr))); + memset_startat(desc, 0, queue_addr_lo); desc->cmd.info0 &= ~HAL_REO_CMD_HDR_INFO0_STATUS_REQUIRED; if (cmd->flag & HAL_REO_CMD_FLG_NEED_STATUS) @@ -762,15 +759,17 @@ void ath11k_hal_reo_qdesc_setup(void *vaddr, int tid, u32 ba_window_size, * size changes and also send WMI message to FW to change the REO * queue descriptor in Rx peer entry as part of dp_rx_tid_update. */ - memset(ext_desc, 0, 3 * sizeof(*ext_desc)); + memset(ext_desc, 0, sizeof(*ext_desc)); ath11k_hal_reo_set_desc_hdr(&ext_desc->desc_hdr, HAL_DESC_REO_OWNED, HAL_DESC_REO_QUEUE_EXT_DESC, REO_QUEUE_DESC_MAGIC_DEBUG_PATTERN_1); ext_desc++; + memset(ext_desc, 0, sizeof(*ext_desc)); ath11k_hal_reo_set_desc_hdr(&ext_desc->desc_hdr, HAL_DESC_REO_OWNED, HAL_DESC_REO_QUEUE_EXT_DESC, REO_QUEUE_DESC_MAGIC_DEBUG_PATTERN_2); ext_desc++; + memset(ext_desc, 0, sizeof(*ext_desc)); ath11k_hal_reo_set_desc_hdr(&ext_desc->desc_hdr, HAL_DESC_REO_OWNED, HAL_DESC_REO_QUEUE_EXT_DESC, REO_QUEUE_DESC_MAGIC_DEBUG_PATTERN_3);