diff options
| author | Kees Cook <keescook@chromium.org> | 2018-07-31 21:51:54 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-08-02 23:23:51 +0200 |
| commit | 704f83928c8e7da6e06144569efb15dec73278e8 (patch) | |
| tree | 6603bc65758e0c761fc773b8341bf9875dc5fe76 /include/scsi | |
| parent | libata-scsi: Move sense buffers onto stack (diff) | |
| download | linux-704f83928c8e7da6e06144569efb15dec73278e8.tar.xz linux-704f83928c8e7da6e06144569efb15dec73278e8.zip | |
scsi: Check sense buffer size at build time
To avoid introducing problems like those fixed in commit f7068114d45e
("sr: pass down correctly sized SCSI sense buffer"), this creates a macro
wrapper for scsi_execute() that verifies the size of the sense buffer
similar to what was done for command string sizes in commit 3756f6401c30
("exec: avoid gcc-8 warning for get_task_comm").
Another solution could be to add a length argument to scsi_execute(),
but this function already takes a lot of arguments and Jens was not fond
of that approach.
Additionally, this moves the SCSI_SENSE_BUFFERSIZE definition into
scsi_device.h, and removes a redundant include for scsi_device.h from
scsi_cmnd.h.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 6 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 14 |
2 files changed, 15 insertions, 5 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index cae229b5395c..c891ada3c5c2 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -15,8 +15,6 @@ struct Scsi_Host; struct scsi_driver; -#include <scsi/scsi_device.h> - /* * MAX_COMMAND_SIZE is: * The longest fixed-length SCSI CDB as per the SCSI standard. @@ -121,11 +119,11 @@ struct scsi_cmnd { struct request *request; /* The command we are working on */ -#define SCSI_SENSE_BUFFERSIZE 96 unsigned char *sense_buffer; /* obtained by REQUEST SENSE when * CHECK CONDITION is received on original - * command (auto-sense) */ + * command (auto-sense). Length must be + * SCSI_SENSE_BUFFERSIZE bytes. */ /* Low-level done function - can be used by low-level driver to point * to completion function. Not used by mid/upper level code. */ diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 4c36af6edd79..202f4d6a4342 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -17,6 +17,8 @@ struct scsi_sense_hdr; typedef __u64 __bitwise blist_flags_t; +#define SCSI_SENSE_BUFFERSIZE 96 + struct scsi_mode_data { __u32 length; __u16 block_descriptor_length; @@ -426,11 +428,21 @@ extern const char *scsi_device_state_name(enum scsi_device_state); extern int scsi_is_sdev_device(const struct device *); extern int scsi_is_target_device(const struct device *); extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); -extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, +extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, int data_direction, void *buffer, unsigned bufflen, unsigned char *sense, struct scsi_sense_hdr *sshdr, int timeout, int retries, u64 flags, req_flags_t rq_flags, int *resid); +/* Make sure any sense buffer is the correct size. */ +#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ + sshdr, timeout, retries, flags, rq_flags, resid) \ +({ \ + BUILD_BUG_ON((sense) != NULL && \ + sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ + __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ + sense, sshdr, timeout, retries, flags, rq_flags, \ + resid); \ +}) static inline int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, int data_direction, void *buffer, unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, |