linux-cve-announce - CVE-2024-56750: erofs: fix blksize < PAGE

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Message-ID: <2024122927-CVE-2024-56750-db4d@gregkh>
Date: Sun, 29 Dec 2024 12:29:43 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56750: erofs: fix blksize < PAGE_SIZE for file-backed mounts

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

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

erofs: fix blksize < PAGE_SIZE for file-backed mounts

Adjust sb->s_blocksize{,_bits} directly for file-backed
mounts when the fs block size is smaller than PAGE_SIZE.

Previously, EROFS used sb_set_blocksize(), which caused
a panic if bdev-backed mounts is not used.

The Linux kernel CVE team has assigned CVE-2024-56750 to this issue.


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

	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.12.2 with commit 679d8537e5748241c71ac97a6b6dc919eae31716
	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.13-rc1 with commit bae0854160939a64a092516ff1b2f221402b843b

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-2024-56750
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/erofs/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/679d8537e5748241c71ac97a6b6dc919eae31716
	https://git.kernel.org/stable/c/bae0854160939a64a092516ff1b2f221402b843b