linux-cve-announce - CVE-2024-53049: slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache

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Message-ID: <2024111926-CVE-2024-53049-fa45@gregkh>
Date: Tue, 19 Nov 2024 18:19:31 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53049: slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof

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

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

slub/kunit: fix a WARNING due to unwrapped __kmalloc_cache_noprof

'modprobe slub_kunit' will have a warning as shown below. The root cause
is that __kmalloc_cache_noprof was directly used, which resulted in no
alloc_tag being allocated. This caused current->alloc_tag to be null,
leading to a warning in alloc_tag_add_check.

Let's add an alloc_hook layer to __kmalloc_cache_noprof specifically
within lib/slub_kunit.c, which is the only user of this internal slub
function outside kmalloc implementation itself.

[58162.947016] WARNING: CPU: 2 PID: 6210 at
./include/linux/alloc_tag.h:125 alloc_tagging_slab_alloc_hook+0x268/0x27c
[58162.957721] Call trace:
[58162.957919]  alloc_tagging_slab_alloc_hook+0x268/0x27c
[58162.958286]  __kmalloc_cache_noprof+0x14c/0x344
[58162.958615]  test_kmalloc_redzone_access+0x50/0x10c [slub_kunit]
[58162.959045]  kunit_try_run_case+0x74/0x184 [kunit]
[58162.959401]  kunit_generic_run_threadfn_adapter+0x2c/0x4c [kunit]
[58162.959841]  kthread+0x10c/0x118
[58162.960093]  ret_from_fork+0x10/0x20
[58162.960363] ---[ end trace 0000000000000000 ]---

The Linux kernel CVE team has assigned CVE-2024-53049 to this issue.


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

	Issue introduced in 6.11 with commit a0a44d9175b3 and fixed in 6.11.7 with commit 79aea7dfd98f
	Issue introduced in 6.11 with commit a0a44d9175b3 and fixed in 6.12 with commit 2b059d0d1e62

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-2024-53049
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:
	lib/slub_kunit.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/79aea7dfd98fbbf282d1408fc21849fc9a677768
	https://git.kernel.org/stable/c/2b059d0d1e624adc6e69a754bc48057f8bf459dc