linux-cve-announce - CVE-2024-50227: thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer

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Message-ID: <2024110928-CVE-2024-50227-1fae@gregkh>
Date: Sat,  9 Nov 2024 11:15:35 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50227: thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan()

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

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

thunderbolt: Fix KASAN reported stack out-of-bounds read in tb_retimer_scan()

KASAN reported following issue:

 BUG: KASAN: stack-out-of-bounds in tb_retimer_scan+0xffe/0x1550 [thunderbolt]
 Read of size 4 at addr ffff88810111fc1c by task kworker/u56:0/11
 CPU: 0 UID: 0 PID: 11 Comm: kworker/u56:0 Tainted: G     U             6.11.0+ #1387
 Tainted: [U]=USER
 Workqueue: thunderbolt0 tb_handle_hotplug [thunderbolt]
 Call Trace:
  <TASK>
  dump_stack_lvl+0x6c/0x90
  print_report+0xd1/0x630
  kasan_report+0xdb/0x110
  __asan_report_load4_noabort+0x14/0x20
  tb_retimer_scan+0xffe/0x1550 [thunderbolt]
  tb_scan_port+0xa6f/0x2060 [thunderbolt]
  tb_handle_hotplug+0x17b1/0x3080 [thunderbolt]
  process_one_work+0x626/0x1100
  worker_thread+0x6c8/0xfa0
  kthread+0x2c8/0x3a0
  ret_from_fork+0x3a/0x80
  ret_from_fork_asm+0x1a/0x30

This happens because the loop variable still gets incremented by one so
max becomes 3 instead of 2, and this makes the second loop read past the
the array declared on the stack.

Fix this by assigning to max directly in the loop body.

The Linux kernel CVE team has assigned CVE-2024-50227 to this issue.


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

	Issue introduced in 6.11 with commit ff6ab055e070 and fixed in 6.11.7 with commit 08b2771e9270
	Issue introduced in 6.11 with commit ff6ab055e070 and fixed in 6.12-rc6 with commit e9e1b20fae7d

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-2024-50227
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/thunderbolt/retimer.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/08b2771e9270fbe1ed4fbbe93abe05ac7fe9861d
	https://git.kernel.org/stable/c/e9e1b20fae7de06ba36dd3f8dba858157bad233d