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authorKees Cook <keescook@chromium.org>2013-07-04 02:01:14 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-04 03:07:25 +0400
commitffc8b30866879ed9ba62bd0a86fecdbd51cd3d19 (patch)
tree21fdc09c7011ed9a1b85e98f7718a58a2c903d32 /drivers/block/nbd.c
parent542db01579fbb7ea7d1f7bb9ddcef1559df660b2 (diff)
downloadlinux-ffc8b30866879ed9ba62bd0a86fecdbd51cd3d19.tar.xz
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@chromium.org> Cc: Jens Axboe <axboe@kernel.dk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/nbd.c')
-rw-r--r--drivers/block/nbd.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 037288e7874d..46b35f7acfde 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -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);