linux-cve-announce - CVE-2024-53235: erofs: fix file-backed mounts over FUSE

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Message-ID: <2024122738-CVE-2024-53235-80a9@gregkh>
Date: Fri, 27 Dec 2024 14:53:21 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53235: erofs: fix file-backed mounts over FUSE

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

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

erofs: fix file-backed mounts over FUSE

syzbot reported a null-ptr-deref in fuse_read_args_fill:
 fuse_read_folio+0xb0/0x100 fs/fuse/file.c:905
 filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367
 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 erofs_bread+0x34d/0x7e0 fs/erofs/data.c:41
 erofs_read_superblock fs/erofs/super.c:281 [inline]
 erofs_fc_fill_super+0x2b9/0x2500 fs/erofs/super.c:625

Unlike most filesystems, some network filesystems and FUSE need
unavoidable valid `file` pointers for their read I/Os [1].
Anyway, those use cases need to be supported too.

[1] https://docs.kernel.org/filesystems/vfs.html

The Linux kernel CVE team has assigned CVE-2024-53235 to this issue.


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

	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.12.2 with commit 5036f2f024cac40a02ea6ea70de2c3a4407d16bc
	Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.13-rc1 with commit 3a23787ca8756920d65fda39f41353a4be1d1642

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-2024-53235
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/data.c
	fs/erofs/internal.h


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/5036f2f024cac40a02ea6ea70de2c3a4407d16bc
	https://git.kernel.org/stable/c/3a23787ca8756920d65fda39f41353a4be1d1642