linux-cve-announce - CVE-2023-54068: f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw

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Message-ID: <2025122430-CVE-2023-54068-dbe6@gregkh>
Date: Wed, 24 Dec 2025 13:27:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54068: f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw_pages()

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

f2fs: compress: fix to call f2fs_wait_on_page_writeback() in f2fs_write_raw_pages()

BUG_ON() will be triggered when writing files concurrently,
because the same page is writtenback multiple times.

1597 void folio_end_writeback(struct folio *folio)
1598 {
		......
1618     if (!__folio_end_writeback(folio))
1619         BUG();
		......
1625 }

kernel BUG at mm/filemap.c:1619!
Call Trace:
 <TASK>
 f2fs_write_end_io+0x1a0/0x370
 blk_update_request+0x6c/0x410
 blk_mq_end_request+0x15/0x130
 blk_complete_reqs+0x3c/0x50
 __do_softirq+0xb8/0x29b
 ? sort_range+0x20/0x20
 run_ksoftirqd+0x19/0x20
 smpboot_thread_fn+0x10b/0x1d0
 kthread+0xde/0x110
 ? kthread_complete_and_exit+0x20/0x20
 ret_from_fork+0x22/0x30
 </TASK>

Below is the concurrency scenario:

[Process A]		[Process B]		[Process C]
f2fs_write_raw_pages()
  - redirty_page_for_writepage()
  - unlock page()
			f2fs_do_write_data_page()
			  - lock_page()
			  - clear_page_dirty_for_io()
			  - set_page_writeback() [1st writeback]
			    .....
			    - unlock page()

						generic_perform_write()
						  - f2fs_write_begin()
						    - wait_for_stable_page()

						  - f2fs_write_end()
						    - set_page_dirty()

  - lock_page()
    - f2fs_do_write_data_page()
      - set_page_writeback() [2st writeback]

This problem was introduced by the previous commit 7377e853967b ("f2fs:
compress: fix potential deadlock of compress file"). All pagelocks were
released in f2fs_write_raw_pages(), but whether the page was
in the writeback state was ignored in the subsequent writing process.
Let's fix it by waiting for the page to writeback before writing.

The Linux kernel CVE team has assigned CVE-2023-54068 to this issue.


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

	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 5.10.180 with commit a8226a45b2a9ce83ba7a167a387a00fecc319e71
	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 5.15.111 with commit 169134da419cb8ffbe3b0743bc24573e16952ea9
	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 6.1.28 with commit 6604df2a9d07ba8f8fb1ac14046c2c83776faa4f
	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 6.2.15 with commit 9940877c4fe752923a53f0f7372f2f152b6eccf0
	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 6.3.2 with commit ad31eed06c3b4d63b2d38322a271d4009aee4bb3
	Issue introduced in 5.6 with commit 4c8ff7095bef64fc47e996a938f7d57f9e077da3 and fixed in 6.4 with commit babedcbac164cec970872b8097401ca913a80e61

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-2023-54068
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/compress.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/a8226a45b2a9ce83ba7a167a387a00fecc319e71
	https://git.kernel.org/stable/c/169134da419cb8ffbe3b0743bc24573e16952ea9
	https://git.kernel.org/stable/c/6604df2a9d07ba8f8fb1ac14046c2c83776faa4f
	https://git.kernel.org/stable/c/9940877c4fe752923a53f0f7372f2f152b6eccf0
	https://git.kernel.org/stable/c/ad31eed06c3b4d63b2d38322a271d4009aee4bb3
	https://git.kernel.org/stable/c/babedcbac164cec970872b8097401ca913a80e61