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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id z3sm570609pjq.32.2022.01.12.14.06.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Jan 2022 14:06:56 -0800 (PST) From: Kees Cook To: Jens Axboe Cc: Kees Cook , linux-ide@vger.kernel.org, Damien Le Moal , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH][RESEND] sata_fsl: Use struct_group() for memcpy() region Date: Wed, 12 Jan 2022 14:06:52 -0800 Message-Id: <20220112220652.3952944-1-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2183; h=from:subject; bh=5p121XAzQa6qN5E6EhVnf7REcLupYKUuIK7FpZN6ZM4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBh31D8twxgwYJUCIhYXTXOl2rV+4GHrPs7/ZvQKKBy +ARWDKqJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYd9Q/AAKCRCJcvTf3G3AJjzpD/ 0Xo3PYXRnkZQETy6n35GeZuDyC+Ugk2TK/R73XlSmpkKy04rQ8vVL0Xo5tqtyJMN2cHsmx1TWPdLW5 geORAPhsd/9iTzUnJ3AyTHloTYg1EqRG+N/HZt96lfbgo4M9dKO8PitIoiuYB2IlkdWWNXyROeeZvh EEx4vNPTFuG4jWVBCo+3tTf84940m8tTtYJy4iOoBt7Yhl7G9kbovJ7DRuyLzW9jmdFlT7Yx5AnNfr We3OO0gK6HZz/XAs5BKJZo/VvscsvDv4ugVKLILZ82OU/ymjXxWxct5dAZpl2NjdNDfrUvVZo1YETk gJys9zx6eBBpmYuVUCoJJ9WvmOocpIEgygzQrhtMMi5GK15BNF7F04Gi6nK4gjXPaIL5p6FiE0QcTG kqCapgEIJ3NXyKRlkW1tCcs6Fw81MZN6uz7XbL8vQP1H6dlsXQ+u6qRPNpSmi4pqetB49WO8OcI5Np 1d+XGX9T2huW6tKidhAlchxvksyLvWZ8TBZ53eUco115XjZHXbH4th4StPdtCZLPdnrTpSFZYAe9EM w4brwIav9TWKYyiCDIVoFmC5JkG4BDzFWdlc0G/Lr9amltMMlx3jJjA+XeLNuwBW0ctcX9cUNzMJZm l0CWyNvLLkkW6fsyXbdI0xX4TgunorbferXwwKCawdNmUHcoz/yN2wOdjinw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. Use struct_group() in struct command_desc around members acmd and fill, so they can be referenced together. This will allow memset(), memcpy(), and sizeof() to more easily reason about sizes, improve readability, and avoid future warnings about writing beyond the end of acmd: In function 'fortify_memset_chk', inlined from 'sata_fsl_qc_prep' at drivers/ata/sata_fsl.c:534:3: ./include/linux/fortify-string.h:199:4: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning] 199 | __write_overflow_field(); | ^~~~~~~~~~~~~~~~~~~~~~~~ Cc: Jens Axboe Cc: linux-ide@vger.kernel.org Signed-off-by: Kees Cook --- Jens, can you take (or Ack) this? It's a dependency for the FORTIFY_SOURCE improvements that are close to being finished. :) --- drivers/ata/sata_fsl.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c index 3b31a4f596d8..c5a2c1e9ed6b 100644 --- a/drivers/ata/sata_fsl.c +++ b/drivers/ata/sata_fsl.c @@ -246,8 +246,10 @@ enum { struct command_desc { u8 cfis[8 * 4]; u8 sfis[8 * 4]; - u8 acmd[4 * 4]; - u8 fill[4 * 4]; + struct_group(cdb, + u8 acmd[4 * 4]; + u8 fill[4 * 4]; + ); u32 prdt[SATA_FSL_MAX_PRD_DIRECT * 4]; u32 prdt_indirect[(SATA_FSL_MAX_PRD - SATA_FSL_MAX_PRD_DIRECT) * 4]; }; @@ -531,8 +533,8 @@ static enum ata_completion_errors sata_fsl_qc_prep(struct ata_queued_cmd *qc) /* setup "ACMD - atapi command" in cmd. desc. if this is ATAPI cmd */ if (ata_is_atapi(qc->tf.protocol)) { desc_info |= ATAPI_CMD; - memset((void *)&cd->acmd, 0, 32); - memcpy((void *)&cd->acmd, qc->cdb, qc->dev->cdb_len); + memset(&cd->cdb, 0, sizeof(cd->cdb)); + memcpy(&cd->cdb, qc->cdb, qc->dev->cdb_len); } if (qc->flags & ATA_QCFLAG_DMAMAP) -- 2.30.2