CVE-2013-2851 block: passing disk names as format strings (rhbz 969515 971662)

1 files changed, 64 insertions, 0 deletions

diff --git a/block-do-not-pass-disk-names-as-format-strings.patch b/block-do-not-pass-disk-names-as-format-strings.patch
new file mode 100644
index 000000000..496111dcd
--- /dev/null
+++ b/block-do-not-pass-disk-names-as-format-strings.patch
@@ -0,0 +1,64 @@
+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: stable@vger.kernel.org
+Cc: Jens Axboe <axboe@kernel.dk>
+---
+ block/genhd.c              |    2 +-
+ drivers/block/nbd.c        |    3 ++-
+ drivers/scsi/osd/osd_uld.c |    2 +-
+ 3 files changed, 4 insertions(+), 3 deletions(-)
+
+diff --git a/block/genhd.c b/block/genhd.c
+index 20625ee..cdeb527 100644
+--- a/block/genhd.c
++++ b/block/genhd.c
+@@ -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);
+diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
+index 037288e..46b35f7 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);
+diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
+index 0fab6b5..9d86947 100644
+--- a/drivers/scsi/osd/osd_uld.c
++++ b/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;
+-- 
+1.7.9.5
+
+--
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