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scsi: Check sense buffer size at build time

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To avoid introducing problems like those fixed in commit f7068114d4
("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 3756f6401c
("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 <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Kees Cook 2018-07-31 12:51:54 -07:00 • committed by Jens Axboe
commit 704f83928c
3 changed files with 18 additions and 8 deletions
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6
drivers/scsi/scsi_lib.c
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@ -238,7 +238,7 @@ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
/**
* scsi_execute - insert request and wait for the result
* __scsi_execute - insert request and wait for the result
* @sdev: scsi device
* @cmd: scsi command
* @data_direction: data direction
@ -255,7 +255,7 @@ void scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
* Returns the scsi_cmnd result field if a command was executed, or a negative
* Linux error code if we didn't get that far.
*/
int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
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,
@ -309,7 +309,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
return ret;
}
EXPORT_SYMBOL(scsi_execute);
EXPORT_SYMBOL(__scsi_execute);
/*
* Function: scsi_init_cmd_errh()