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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id e12sm3784712pjh.33.2021.07.27.14.06.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:54 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, 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 Subject: [PATCH 43/64] ath11k: Use memset_after() for clearing queue descriptors Date: Tue, 27 Jul 2021 13:58:34 -0700 Message-Id: <20210727205855.411487-44-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3116; h=from:subject; bh=j3LfXLw0C1RpC2nAiDmR2FV9ppMLr+xX2/Byaw0lUBI=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOJQjRIUTQLa3kW6JEv7dcnm26TeZbOKFOYV9Uy JUsIKlSJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBziQAKCRCJcvTf3G3AJv7OD/ wOv9NnzO8vnuCd1yLn28Uh20ipd4blI/H+kMp3Wx9VsXqAUniUau5o4ju7EMl4saOmJ/ltHPdb99Yn /TXqBvuvm/fcFKOY1q7nIR/AaYPJW7LhNkRTXplMqKXe+3Qnnu8FBSAw2DUq1zXDmuYemIlXptx4ne Bmu+McSU4fRhGXiPWsd07ziif5KbBqSw6Xksw8nxp+XBVcxJX8et8bdwHVvJj0saggDJ1aJ4HQ1mF9 4HllmEQZL+wN8MhR+vknVrUK52Mj7rfxI7dwb4lSH2MhOUDYqcIIacwA5QxlhlqjlKy6/FQBNGIoBY ryzx8o2IbdOCSNbzQwAASqLiVYlD6HbVddTDKOJUZ+x++HGUnv9Ns/IgQDKGBNyhoj/ri9ybH6GklO voujRz697QTfjIL/VjnyvyF+xPaJEI8Wohz7g53gpHyYojdV+zinQHZWRwFAMHSly548C+mHC2LU2f E4CcST932vQu8ftiiXm818XOydMxX00CvzoOdlcSm4NgFL87y5zloqO76ihmGAN/LUl+GulYt7gpaN 6tsAlGYd0W8yUr7UrJaRl6QTkAffrdEJCc47+DqZK4QRdgofQHTqb0FpwfJ1WH7QWGQzpFXEyUW2Se Px6rDcKN7HvstRyGsxqRWPFEVU0eQ/A1CMhA1WHwshXb3mfP/uaPnWfv3RBw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@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_after() 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. 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..c72b6b45b3ba 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_after(desc, 0, cmd); 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_after(desc, 0, cmd); 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_after(desc, 0, cmd); 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); -- 2.30.2