linux-cve-announce - CVE-2023-52932: mm/swapfile: add cond_resched() in get_swap

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Message-ID: <2025032720-CVE-2023-52932-434b@gregkh>
Date: Thu, 27 Mar 2025 17:37:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52932: mm/swapfile: add cond_resched() in get_swap_pages()

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

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

mm/swapfile: add cond_resched() in get_swap_pages()

The softlockup still occurs in get_swap_pages() under memory pressure.  64
CPU cores, 64GB memory, and 28 zram devices, the disksize of each zram
device is 50MB with same priority as si.  Use the stress-ng tool to
increase memory pressure, causing the system to oom frequently.

The plist_for_each_entry_safe() loops in get_swap_pages() could reach tens
of thousands of times to find available space (extreme case:
cond_resched() is not called in scan_swap_map_slots()).  Let's add
cond_resched() into get_swap_pages() when failed to find available space
to avoid softlockup.

The Linux kernel CVE team has assigned CVE-2023-52932 to this issue.


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

	Fixed in 4.14.306 with commit 29f0349c5c76b627fe06b87d4b13fa03a6ce8e64
	Fixed in 4.19.273 with commit 387217b97e99699c34e6d95ce2b91b327fcd853e
	Fixed in 5.4.232 with commit d49c85a1913385eed46dd16a25ad0928253767f0
	Fixed in 5.10.168 with commit 30187be29052bba9203b0ae2bdd815e0bc2faaab
	Fixed in 5.15.93 with commit 5dbe1ebd56470d03b78fc31491a9e4d433106ef2
	Fixed in 6.1.11 with commit 49178d4d61e78aed8c837dfeea8a450700f196e2
	Fixed in 6.2 with commit 7717fc1a12f88701573f9ed897cc4f6699c661e3

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-2023-52932
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/swapfile.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/29f0349c5c76b627fe06b87d4b13fa03a6ce8e64
	https://git.kernel.org/stable/c/387217b97e99699c34e6d95ce2b91b327fcd853e
	https://git.kernel.org/stable/c/d49c85a1913385eed46dd16a25ad0928253767f0
	https://git.kernel.org/stable/c/30187be29052bba9203b0ae2bdd815e0bc2faaab
	https://git.kernel.org/stable/c/5dbe1ebd56470d03b78fc31491a9e4d433106ef2
	https://git.kernel.org/stable/c/49178d4d61e78aed8c837dfeea8a450700f196e2
	https://git.kernel.org/stable/c/7717fc1a12f88701573f9ed897cc4f6699c661e3