diff options
| author | David Disseldorp <ddiss@suse.de> | 2017-10-19 01:39:19 +0200 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2017-11-04 15:00:17 -0700 |
| commit | bdc79f0ed12ff55a9b56a91da04d0c8d8a786b9c (patch) | |
| tree | 6742beee0ec5e5dbc078c4362392491294f76af0 /drivers/target | |
| parent | 1ae01724ae92004be36a6c11c4d5a9f94e915204 (diff) | |
| download | linux-bdc79f0ed12ff55a9b56a91da04d0c8d8a786b9c.tar.bz2 | |
target: fix PR state file path truncation
If an LIO backstore is configured with a sufficiently long Unit Serial
string, alongside a similarly long dbroot path, then a truncated
Persistent Reservation APTPL state file path will be used. This
truncation can unintentionally lead to two LUs with differing serial
numbers sharing PR state file.
Fixes: fdddf932269a ("target: use new "dbroot" target attribute")
Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_pr.c | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index a54490709811..3d2b46472dfd 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -1973,24 +1973,21 @@ static int __core_scsi3_write_aptpl_to_file( struct t10_wwn *wwn = &dev->t10_wwn; struct file *file; int flags = O_RDWR | O_CREAT | O_TRUNC; - char path[512]; + char *path; u32 pr_aptpl_buf_len; int ret; loff_t pos = 0; - memset(path, 0, 512); - - if (strlen(&wwn->unit_serial[0]) >= 512) { - pr_err("WWN value for struct se_device does not fit" - " into path buffer\n"); - return -EMSGSIZE; - } + path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root, + &wwn->unit_serial[0]); + if (!path) + return -ENOMEM; - snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); file = filp_open(path, flags, 0600); if (IS_ERR(file)) { pr_err("filp_open(%s) for APTPL metadata" " failed\n", path); + kfree(path); return PTR_ERR(file); } @@ -2001,6 +1998,7 @@ static int __core_scsi3_write_aptpl_to_file( if (ret < 0) pr_debug("Error writing APTPL metadata file: %s\n", path); fput(file); + kfree(path); return (ret < 0) ? -EIO : 0; } |