linux-cve-announce - CVE-2025-38374: optee: ffa: fix sleep in atomic context

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Message-ID: <2025072503-CVE-2025-38374-52a8@gregkh>
Date: Fri, 25 Jul 2025 14:55:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38374: optee: ffa: fix sleep in atomic context

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

optee: ffa: fix sleep in atomic context

The OP-TEE driver registers the function notif_callback() for FF-A
notifications. However, this function is called in an atomic context
leading to errors like this when processing asynchronous notifications:

 | BUG: sleeping function called from invalid context at kernel/locking/mutex.c:258
 | in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 9, name: kworker/0:0
 | preempt_count: 1, expected: 0
 | RCU nest depth: 0, expected: 0
 | CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted 6.14.0-00019-g657536ebe0aa #13
 | Hardware name: linux,dummy-virt (DT)
 | Workqueue: ffa_pcpu_irq_notification notif_pcpu_irq_work_fn
 | Call trace:
 |  show_stack+0x18/0x24 (C)
 |  dump_stack_lvl+0x78/0x90
 |  dump_stack+0x18/0x24
 |  __might_resched+0x114/0x170
 |  __might_sleep+0x48/0x98
 |  mutex_lock+0x24/0x80
 |  optee_get_msg_arg+0x7c/0x21c
 |  simple_call_with_arg+0x50/0xc0
 |  optee_do_bottom_half+0x14/0x20
 |  notif_callback+0x3c/0x48
 |  handle_notif_callbacks+0x9c/0xe0
 |  notif_get_and_handle+0x40/0x88
 |  generic_exec_single+0x80/0xc0
 |  smp_call_function_single+0xfc/0x1a0
 |  notif_pcpu_irq_work_fn+0x2c/0x38
 |  process_one_work+0x14c/0x2b4
 |  worker_thread+0x2e4/0x3e0
 |  kthread+0x13c/0x210
 |  ret_from_fork+0x10/0x20

Fix this by adding work queue to process the notification in a
non-atomic context.

The Linux kernel CVE team has assigned CVE-2025-38374 to this issue.


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

	Issue introduced in 6.8 with commit d0476a59de064205f4aaa8f7c6d6f32bc28a44d4 and fixed in 6.12.37 with commit 5f28563f0c6862c99eb115c918421d9b73f137ad
	Issue introduced in 6.8 with commit d0476a59de064205f4aaa8f7c6d6f32bc28a44d4 and fixed in 6.15.6 with commit f27cf15783bd60063c6c97434cbd67ebd91d8db5
	Issue introduced in 6.8 with commit d0476a59de064205f4aaa8f7c6d6f32bc28a44d4 and fixed in 6.16-rc5 with commit 312d02adb959ea199372f375ada06e0186f651e4

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-2025-38374
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/tee/optee/ffa_abi.c
	drivers/tee/optee/optee_private.h


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/5f28563f0c6862c99eb115c918421d9b73f137ad
	https://git.kernel.org/stable/c/f27cf15783bd60063c6c97434cbd67ebd91d8db5
	https://git.kernel.org/stable/c/312d02adb959ea199372f375ada06e0186f651e4