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block: do not pass disk names as format strings

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Disk names may contain arbitrary strings, so they must not be
interpreted as format strings.  It seems that only md allows arbitrary
strings to be used for disk names, but this could allow for a local
memory corruption from uid 0 into ring 0.

CVE-2013-2851

Signed-off-by: Kees Cook <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kees Cook authored and Linus Torvalds committed 2013-07-03 16:07:25 -07:00
1 parent 542db01579
commit ffc8b30866
3 files changed
+4 -3
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block/genhd.c
+1 -1
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@@ -512,7 +512,7 @@ static void register_disk(struct gendisk *disk)
ddev->parent = disk->driverfs_dev;
dev_set_name(ddev, disk->disk_name);
dev_set_name(ddev, "%s", disk->disk_name);
/* delay uevents, until we scanned partition table */
dev_set_uevent_suppress(ddev, 1);
drivers/block/nbd.c
+2 -1
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@@ -714,7 +714,8 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
else
blk_queue_flush(nbd->disk->queue, 0);
thread = kthread_create(nbd_thread, nbd, nbd->disk->disk_name);
thread = kthread_create(nbd_thread, nbd, "%s",
nbd->disk->disk_name);
if (IS_ERR(thread)) {
mutex_lock(&nbd->tx_lock);
return PTR_ERR(thread);
drivers/scsi/osd/osd_uld.c
+1 -1
View File
@@ -485,7 +485,7 @@ static int osd_probe(struct device *dev)
oud->class_dev.class = &osd_uld_class;
oud->class_dev.parent = dev;
oud->class_dev.release = __remove;
error = dev_set_name(&oud->class_dev, disk->disk_name);
error = dev_set_name(&oud->class_dev, "%s", disk->disk_name);
if (error) {
OSD_ERR("dev_set_name failed => %d\n", error);
goto err_put_cdev;