linux-cve-announce - CVE-2024-53175: ipc: fix memleak if msg_init_ns failed in create_ipc

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Message-ID: <2024122717-CVE-2024-53175-6ebd@gregkh>
Date: Fri, 27 Dec 2024 14:52:21 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53175: ipc: fix memleak if msg_init_ns failed in create_ipc_ns

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

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

ipc: fix memleak if msg_init_ns failed in create_ipc_ns

Percpu memory allocation may failed during create_ipc_ns however this
fail is not handled properly since ipc sysctls and mq sysctls is not
released properly. Fix this by release these two resource when failure.

Here is the kmemleak stack when percpu failed:

unreferenced object 0xffff88819de2a600 (size 512):
  comm "shmem_2nstest", pid 120711, jiffies 4300542254
  hex dump (first 32 bytes):
    60 aa 9d 84 ff ff ff ff fc 18 48 b2 84 88 ff ff  `.........H.....
    04 00 00 00 a4 01 00 00 20 e4 56 81 ff ff ff ff  ........ .V.....
  backtrace (crc be7cba35):
    [<ffffffff81b43f83>] __kmalloc_node_track_caller_noprof+0x333/0x420
    [<ffffffff81a52e56>] kmemdup_noprof+0x26/0x50
    [<ffffffff821b2f37>] setup_mq_sysctls+0x57/0x1d0
    [<ffffffff821b29cc>] copy_ipcs+0x29c/0x3b0
    [<ffffffff815d6a10>] create_new_namespaces+0x1d0/0x920
    [<ffffffff815d7449>] copy_namespaces+0x2e9/0x3e0
    [<ffffffff815458f3>] copy_process+0x29f3/0x7ff0
    [<ffffffff8154b080>] kernel_clone+0xc0/0x650
    [<ffffffff8154b6b1>] __do_sys_clone+0xa1/0xe0
    [<ffffffff843df8ff>] do_syscall_64+0xbf/0x1c0
    [<ffffffff846000b0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53

The Linux kernel CVE team has assigned CVE-2024-53175 to this issue.


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

	Issue introduced in 6.1 with commit 72d1e611082eda18689106a0c192f2827072713c and fixed in 6.1.120 with commit 3d230cfd4b9b0558c7b2039ba1def2ce6b6cd158
	Issue introduced in 6.1 with commit 72d1e611082eda18689106a0c192f2827072713c and fixed in 6.6.64 with commit 10209665b5bf199f8065b2e7d2b2dc6cdf227117
	Issue introduced in 6.1 with commit 72d1e611082eda18689106a0c192f2827072713c and fixed in 6.11.11 with commit 8fed302872e26c7bf44d855c53a1cde747172d58
	Issue introduced in 6.1 with commit 72d1e611082eda18689106a0c192f2827072713c and fixed in 6.12.2 with commit 928de5fcd462498b8334107035da8ab85e316d8a
	Issue introduced in 6.1 with commit 72d1e611082eda18689106a0c192f2827072713c and fixed in 6.13-rc1 with commit bc8f5921cd69188627c08041276238de222ab466

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-2024-53175
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:
	ipc/namespace.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/3d230cfd4b9b0558c7b2039ba1def2ce6b6cd158
	https://git.kernel.org/stable/c/10209665b5bf199f8065b2e7d2b2dc6cdf227117
	https://git.kernel.org/stable/c/8fed302872e26c7bf44d855c53a1cde747172d58
	https://git.kernel.org/stable/c/928de5fcd462498b8334107035da8ab85e316d8a
	https://git.kernel.org/stable/c/bc8f5921cd69188627c08041276238de222ab466