linux-cve-announce - CVE-2024-53113: mm: fix NULL pointer dereference in alloc_pages_bulk

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Message-ID: <2024120249-CVE-2024-53113-57df@gregkh>
Date: Mon,  2 Dec 2024 14:52:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53113: mm: fix NULL pointer dereference in alloc_pages_bulk_noprof

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

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

mm: fix NULL pointer dereference in alloc_pages_bulk_noprof

We triggered a NULL pointer dereference for ac.preferred_zoneref->zone in
alloc_pages_bulk_noprof() when the task is migrated between cpusets.

When cpuset is enabled, in prepare_alloc_pages(), ac->nodemask may be
&current->mems_allowed.  when first_zones_zonelist() is called to find
preferred_zoneref, the ac->nodemask may be modified concurrently if the
task is migrated between different cpusets.  Assuming we have 2 NUMA Node,
when traversing Node1 in ac->zonelist, the nodemask is 2, and when
traversing Node2 in ac->zonelist, the nodemask is 1.  As a result, the
ac->preferred_zoneref points to NULL zone.

In alloc_pages_bulk_noprof(), for_each_zone_zonelist_nodemask() finds a
allowable zone and calls zonelist_node_idx(ac.preferred_zoneref), leading
to NULL pointer dereference.

__alloc_pages_noprof() fixes this issue by checking NULL pointer in commit
ea57485af8f4 ("mm, page_alloc: fix check for NULL preferred_zone") and
commit df76cee6bbeb ("mm, page_alloc: remove redundant checks from alloc
fastpath").

To fix it, check NULL pointer for preferred_zoneref->zone.

The Linux kernel CVE team has assigned CVE-2024-53113 to this issue.

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

	Issue introduced in 5.13 with commit 387ba26fb1cb and fixed in 6.1.119 with commit 6addb2d9501e
	Issue introduced in 5.13 with commit 387ba26fb1cb and fixed in 6.6.63 with commit d0f16cec7977
	Issue introduced in 5.13 with commit 387ba26fb1cb and fixed in 6.11.10 with commit 31502374627b
	Issue introduced in 5.13 with commit 387ba26fb1cb and fixed in 6.12 with commit 8ce41b0f9d77

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-2024-53113
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:
	mm/page_alloc.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/6addb2d9501ec866d7b3a3b4e665307c437e9be2
	https://git.kernel.org/stable/c/d0f16cec79774c3132df006cf771eddd89d08f58
	https://git.kernel.org/stable/c/31502374627ba9ec3e710dbd0bb00457cc6d2c19
	https://git.kernel.org/stable/c/8ce41b0f9d77cca074df25afd39b86e2ee3aa68e