linux-cve-announce - CVE-2024-40969: f2fs: don't set RO when shutting down f2fs

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Message-ID: <2024071228-CVE-2024-40969-6507@gregkh>
Date: Fri, 12 Jul 2024 14:32:45 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-40969: f2fs: don't set RO when shutting down f2fs

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

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

f2fs: don't set RO when shutting down f2fs

Shutdown does not check the error of thaw_super due to readonly, which
causes a deadlock like below.

f2fs_ioc_shutdown(F2FS_GOING_DOWN_FULLSYNC)        issue_discard_thread
 - bdev_freeze
  - freeze_super
 - f2fs_stop_checkpoint()
  - f2fs_handle_critical_error                     - sb_start_write
    - set RO                                         - waiting
 - bdev_thaw
  - thaw_super_locked
    - return -EINVAL, if sb_rdonly()
 - f2fs_stop_discard_thread
  -> wait for kthread_stop(discard_thread);

The Linux kernel CVE team has assigned CVE-2024-40969 to this issue.


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

	Fixed in 6.6.36 with commit 1036d3ea7a32
	Fixed in 6.9.7 with commit f47ed3b284b3
	Fixed in 6.10-rc1 with commit 3bdb7f161697

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-2024-40969
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:
	fs/f2fs/super.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/1036d3ea7a32cb7cee00885c73a1f2ba7fbc499a
	https://git.kernel.org/stable/c/f47ed3b284b38f235355e281f57dfa8fffcc6563
	https://git.kernel.org/stable/c/3bdb7f161697e2d5123b89fe1778ef17a44858e7