linux-cve-announce - CVE-2024-45023: md/raid1: Fix data corruption for degraded array with slow disk

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Message-ID: <2024091109-CVE-2024-45023-d7f2@gregkh>
Date: Wed, 11 Sep 2024 17:14:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-45023: md/raid1: Fix data corruption for degraded array with slow disk

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

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

md/raid1: Fix data corruption for degraded array with slow disk

read_balance() will avoid reading from slow disks as much as possible,
however, if valid data only lands in slow disks, and a new normal disk
is still in recovery, unrecovered data can be read:

raid1_read_request
 read_balance
  raid1_should_read_first
  -> return false
  choose_best_rdev
  -> normal disk is not recovered, return -1
  choose_bb_rdev
  -> missing the checking of recovery, return the normal disk
 -> read unrecovered data

Root cause is that the checking of recovery is missing in
choose_bb_rdev(). Hence add such checking to fix the problem.

Also fix similar problem in choose_slow_rdev().

The Linux kernel CVE team has assigned CVE-2024-45023 to this issue.


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

	Issue introduced in 6.9 with commit 9f3ced792203 and fixed in 6.10.7 with commit 2febf5fdbf5d
	Issue introduced in 6.9 with commit 9f3ced792203 and fixed in 6.11-rc4 with commit c916ca35308d

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-2024-45023
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/raid1.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/2febf5fdbf5d9a52ddc3e986971c8609b1582d67
	https://git.kernel.org/stable/c/c916ca35308d3187c9928664f9be249b22a3a701