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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id a2-20020a170902ecc200b0017f64ab80e5sm24706484plh.179.2023.01.04.16.48.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Jan 2023 16:48:04 -0800 (PST) From: Kees Cook To: Adam Radford Cc: Kees Cook , "James E.J. Bottomley" , "Martin K. Petersen" , "Gustavo A. R. Silva" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] scsi: 3w-sas: Replace 1-element arrays with flexible array members Date: Wed, 4 Jan 2023 16:48:01 -0800 Message-Id: <20230105004757.never.017-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4853; h=from:subject:message-id; bh=fngDH2oJss4+sESGmI2fY1x2FAgrFeUQkGfTN9+iocQ=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjth5Bain+6puH3Sb3/JrYRy2oc/pRGmxm11AX/0Xw s2+izlqJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY7YeQQAKCRCJcvTf3G3AJlLPD/ 9l+/uUbl6Loft70IysZLVyMfYPnC8y2klp3eiLSnUsKn91TtjHZeowcGK4tk7km3fjHMLs1X2jdlMU HuKWnuIDSv9ElQq/uXaZTex55zFG7tc4PcKrylYLH0k+dhFto2PMsqrn3NeVGymysBHeo8J3rAZxbB qVS0Bg/8023frYnGayhasJYv5JKSQZoFi5Q2PErnInysyP8Ry4vZTqF8hm33zegRD16Qkc7ubi9AEE 8nbrxrtSagUm9iJmVnUkdmrKlGZzQp9TuNfWgYAKZEp64WrjWOaYWOgAQzE7QzotkwT+DzkdoJ4UND 6dG9H+hjXstjjA3MpP51T1Gds8f1cG3oAw6Q+kwLxDM4dYees+GPWQs71TxfscAtqKrNqke/6vDNDz /elJwgBuu+JWhf8XzW7sUsuh3iSKP2SA5TzCZbh21lONJpHHzMbVHmgauTMS3U2KMbAdkSJlxfRUGu l+ZywrFDWli5lWVbE+/iCW5zoPMVBvxBeuuoFRoX6Kb2yvGW+D390mZcSASCkvT8qcij4VYo2FhlKi s36wFv3yhnt9/Rhfp6Bp25WguyKISinr2gNIaJTjgCIU43m7u+NW5c10FjwLT1zHXrh1/2tKfIFmVI FNCu8BAP+AkVReKvwKXfnx0fbGsFmYF+5xwniFOjFP/9328k2m4m69VKhBuw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754142206088804040?= X-GMAIL-MSGID: =?utf-8?q?1754142206088804040?= One-element arrays (and multi-element arrays being treated as dynamically sized) are deprecated[1] and are being replaced with flexible array members in support of the ongoing efforts to tighten the FORTIFY_SOURCE routines on memcpy(), correctly instrument array indexing with UBSAN_BOUNDS, and to globally enable -fstrict-flex-arrays=3. Replace one-element arrays with flexible-array member in TW_Ioctl_Buf_Apache and TW_Param_Apache, adjusting the explicit sizing calculations at the same time. This results in no differences in binary output. [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays Cc: Adam Radford Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: "Gustavo A. R. Silva" Cc: linux-scsi@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva --- drivers/scsi/3w-sas.c | 12 ++++++------ drivers/scsi/3w-sas.h | 4 ++-- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c index 3ebe66151dcb..f41c93454f0c 100644 --- a/drivers/scsi/3w-sas.c +++ b/drivers/scsi/3w-sas.c @@ -690,7 +690,7 @@ static void twl_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm newcommand->request_id__lunl = cpu_to_le16(TW_REQ_LUN_IN(TW_LUN_OUT(newcommand->request_id__lunl), request_id)); if (length) { - newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1); + newcommand->sg_list[0].address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache)); newcommand->sg_list[0].length = TW_CPU_TO_SGL(length); } newcommand->sgl_entries__lunh = @@ -702,7 +702,7 @@ static void twl_load_sgl(TW_Device_Extension *tw_dev, TW_Command_Full *full_comm if (TW_SGL_OUT(oldcommand->opcode__sgloffset)) { /* Load the sg list */ sgl = (TW_SG_Entry_ISO *)((u32 *)oldcommand+oldcommand->size - (sizeof(TW_SG_Entry_ISO)/4) + pae + (sizeof(dma_addr_t) > 4 ? 1 : 0)); - sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache) - 1); + sgl->address = TW_CPU_TO_SGL(dma_handle + sizeof(TW_Ioctl_Buf_Apache)); sgl->length = TW_CPU_TO_SGL(length); oldcommand->size += pae; oldcommand->size += sizeof(dma_addr_t) > 4 ? 1 : 0; @@ -748,7 +748,7 @@ static long twl_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long data_buffer_length_adjusted = (driver_command.buffer_length + 511) & ~511; /* Now allocate ioctl buf memory */ - cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, &dma_handle, GFP_KERNEL); + cpu_addr = dma_alloc_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted + sizeof(TW_Ioctl_Buf_Apache), &dma_handle, GFP_KERNEL); if (!cpu_addr) { retval = -ENOMEM; goto out2; @@ -757,7 +757,7 @@ static long twl_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long tw_ioctl = (TW_Ioctl_Buf_Apache *)cpu_addr; /* Now copy down the entire ioctl */ - if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache) - 1)) + if (copy_from_user(tw_ioctl, argp, driver_command.buffer_length + sizeof(TW_Ioctl_Buf_Apache))) goto out3; /* See which ioctl we are doing */ @@ -815,11 +815,11 @@ static long twl_chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long } /* Now copy the entire response to userspace */ - if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length - 1) == 0) + if (copy_to_user(argp, tw_ioctl, sizeof(TW_Ioctl_Buf_Apache) + driver_command.buffer_length) == 0) retval = 0; out3: /* Now free ioctl buf memory */ - dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted+sizeof(TW_Ioctl_Buf_Apache) - 1, cpu_addr, dma_handle); + dma_free_coherent(&tw_dev->tw_pci_dev->dev, data_buffer_length_adjusted + sizeof(TW_Ioctl_Buf_Apache), cpu_addr, dma_handle); out2: mutex_unlock(&tw_dev->ioctl_lock); out: diff --git a/drivers/scsi/3w-sas.h b/drivers/scsi/3w-sas.h index b0508039a280..096dec29e2ac 100644 --- a/drivers/scsi/3w-sas.h +++ b/drivers/scsi/3w-sas.h @@ -335,7 +335,7 @@ typedef struct TAG_TW_Ioctl_Apache { TW_Ioctl_Driver_Command driver_command; char padding[488]; TW_Command_Full firmware_command; - char data_buffer[1]; + char data_buffer[]; } TW_Ioctl_Buf_Apache; /* GetParam descriptor */ @@ -344,7 +344,7 @@ typedef struct { unsigned short parameter_id; unsigned short parameter_size_bytes; unsigned short actual_parameter_size_bytes; - unsigned char data[1]; + unsigned char data[]; } TW_Param_Apache; /* Compatibility information structure */