From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: block: do not pass disk names as format strings
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 <keescook@xxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
block/genhd.c | 2 +-
drivers/block/nbd.c | 3 ++-
drivers/scsi/osd/osd_uld.c | 2 +-
3 files changed, 4 insertions(+), 3 deletions(-)
diff -puN block/genhd.c~block-do-not-pass-disk-names-as-format-strings block/genhd.c
--- a/block/genhd.c~block-do-not-pass-disk-names-as-format-strings
+++ a/block/genhd.c
@@ -512,7 +512,7 @@ static void register_disk(struct gendisk
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);
diff -puN drivers/block/nbd.c~block-do-not-pass-disk-names-as-format-strings drivers/block/nbd.c
--- a/drivers/block/nbd.c~block-do-not-pass-disk-names-as-format-strings
+++ a/drivers/block/nbd.c
@@ -714,7 +714,8 @@ static int __nbd_ioctl(struct block_devi
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);
diff -puN drivers/scsi/osd/osd_uld.c~block-do-not-pass-disk-names-as-format-strings drivers/scsi/osd/osd_uld.c
--- a/drivers/scsi/osd/osd_uld.c~block-do-not-pass-disk-names-as-format-strings
+++ a/drivers/scsi/osd/osd_uld.c
@@ -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;
_
--
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