linux-cve-announce - CVE-2022-49044: dm integrity: fix memory corruption when tag

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Message-ID: <2025022650-CVE-2022-49044-43d1@gregkh>
Date: Wed, 26 Feb 2025 02:54:09 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49044: dm integrity: fix memory corruption when tag_size is less than digest size

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

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

dm integrity: fix memory corruption when tag_size is less than digest size

It is possible to set up dm-integrity in such a way that the
"tag_size" parameter is less than the actual digest size. In this
situation, a part of the digest beyond tag_size is ignored.

In this case, dm-integrity would write beyond the end of the
ic->recalc_tags array and corrupt memory. The corruption happened in
integrity_recalc->integrity_sector_checksum->crypto_shash_final.

Fix this corruption by increasing the tags array so that it has enough
padding at the end to accomodate the loop in integrity_recalc() being
able to write a full digest size for the last member of the tags
array.

The Linux kernel CVE team has assigned CVE-2022-49044 to this issue.


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

	Fixed in 4.19.240 with commit 6a95d91c0b315c965198f6ab7dec7c94129e17e0
	Fixed in 5.4.190 with commit 7f84c937222944c03f4615ca4742df6bed0e5adf
	Fixed in 5.10.112 with commit cd02b2687d66f0a8e716384de4b9a0671331f1dc
	Fixed in 5.15.35 with commit 6b4bf97587ef6c1927a78934b700204920655123
	Fixed in 5.17.4 with commit 4d485cf9b609709e45d5113e6e2b1b01254b2fe9
	Fixed in 5.18 with commit 08c1af8f1c13bbf210f1760132f4df24d0ed46d6

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-2022-49044
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-integrity.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/6a95d91c0b315c965198f6ab7dec7c94129e17e0
	https://git.kernel.org/stable/c/7f84c937222944c03f4615ca4742df6bed0e5adf
	https://git.kernel.org/stable/c/cd02b2687d66f0a8e716384de4b9a0671331f1dc
	https://git.kernel.org/stable/c/6b4bf97587ef6c1927a78934b700204920655123
	https://git.kernel.org/stable/c/4d485cf9b609709e45d5113e6e2b1b01254b2fe9
	https://git.kernel.org/stable/c/08c1af8f1c13bbf210f1760132f4df24d0ed46d6