linux-cve-announce - CVE-2022-49270: dm: fix use-after-free in dm_cleanup_zoned

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Message-ID: <2025022630-CVE-2022-49270-c331@gregkh>
Date: Wed, 26 Feb 2025 02:57:55 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49270: dm: fix use-after-free in dm_cleanup_zoned_dev()

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

dm: fix use-after-free in dm_cleanup_zoned_dev()

dm_cleanup_zoned_dev() uses queue, so it must be called
before blk_cleanup_disk() starts its killing:

blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()->
->...RCU...->blk_free_queue_rcu()->kmem_cache_free()

Otherwise, RCU callback may be executed first and
dm_cleanup_zoned_dev() will touch free'd memory:

 BUG: KASAN: use-after-free in dm_cleanup_zoned_dev+0x33/0xd0
 Read of size 8 at addr ffff88805ac6e430 by task dmsetup/681

 CPU: 4 PID: 681 Comm: dmsetup Not tainted 5.17.0-rc2+ #6
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014
 Call Trace:
  <TASK>
  dump_stack_lvl+0x57/0x7d
  print_address_description.constprop.0+0x1f/0x150
  ? dm_cleanup_zoned_dev+0x33/0xd0
  kasan_report.cold+0x7f/0x11b
  ? dm_cleanup_zoned_dev+0x33/0xd0
  dm_cleanup_zoned_dev+0x33/0xd0
  __dm_destroy+0x26a/0x400
  ? dm_blk_ioctl+0x230/0x230
  ? up_write+0xd8/0x270
  dev_remove+0x156/0x1d0
  ctl_ioctl+0x269/0x530
  ? table_clear+0x140/0x140
  ? lock_release+0xb2/0x750
  ? remove_all+0x40/0x40
  ? rcu_read_lock_sched_held+0x12/0x70
  ? lock_downgrade+0x3c0/0x3c0
  ? rcu_read_lock_sched_held+0x12/0x70
  dm_ctl_ioctl+0xa/0x10
  __x64_sys_ioctl+0xb9/0xf0
  do_syscall_64+0x3b/0x90
  entry_SYSCALL_64_after_hwframe+0x44/0xae
 RIP: 0033:0x7fb6dfa95c27

The Linux kernel CVE team has assigned CVE-2022-49270 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.14 with commit bb37d77239af25cde59693dbe3fac04dd17d7b29 and fixed in 5.15.33 with commit 0987f00a76a17aa7213da492c00ed9e5a6210c73
	Issue introduced in 5.14 with commit bb37d77239af25cde59693dbe3fac04dd17d7b29 and fixed in 5.16.19 with commit fdfe414ca28ddfd562c233fb27385cf820de03e8
	Issue introduced in 5.14 with commit bb37d77239af25cde59693dbe3fac04dd17d7b29 and fixed in 5.17.2 with commit 43a043aed964659bc69ef81f266912b73c80d837
	Issue introduced in 5.14 with commit bb37d77239af25cde59693dbe3fac04dd17d7b29 and fixed in 5.18 with commit 588b7f5df0cb64f281290c7672470c006abe7160

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49270
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/md/dm.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/0987f00a76a17aa7213da492c00ed9e5a6210c73
	https://git.kernel.org/stable/c/fdfe414ca28ddfd562c233fb27385cf820de03e8
	https://git.kernel.org/stable/c/43a043aed964659bc69ef81f266912b73c80d837
	https://git.kernel.org/stable/c/588b7f5df0cb64f281290c7672470c006abe7160