linux-cve-announce - CVE-2023-53070: ACPI: PPTT: Fix to avoid sleep in the atomic context when PPTT is absent

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Message-ID: <2025050213-CVE-2023-53070-d7b8@gregkh>
Date: Fri,  2 May 2025 17:55:35 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53070: ACPI: PPTT: Fix to avoid sleep in the atomic context when PPTT is absent

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

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

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

ACPI: PPTT: Fix to avoid sleep in the atomic context when PPTT is absent

Commit 0c80f9e165f8 ("ACPI: PPTT: Leave the table mapped for the runtime usage")
enabled to map PPTT once on the first invocation of acpi_get_pptt() and
never unmapped the same allowing it to be used at runtime with out the
hassle of mapping and unmapping the table. This was needed to fetch LLC
information from the PPTT in the cpuhotplug path which is executed in
the atomic context as the acpi_get_table() might sleep waiting for a
mutex.

However it missed to handle the case when there is no PPTT on the system
which results in acpi_get_pptt() being called from all the secondary
CPUs attempting to fetch the LLC information in the atomic context
without knowing the absence of PPTT resulting in the splat like below:

 | BUG: sleeping function called from invalid context at kernel/locking/semaphore.c:164
 | in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1
 | preempt_count: 1, expected: 0
 | RCU nest depth: 0, expected: 0
 | no locks held by swapper/1/0.
 | irq event stamp: 0
 | hardirqs last  enabled at (0): 0x0
 | hardirqs last disabled at (0): copy_process+0x61c/0x1b40
 | softirqs last  enabled at (0): copy_process+0x61c/0x1b40
 | softirqs last disabled at (0): 0x0
 | CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.3.0-rc1 #1
 | Call trace:
 |  dump_backtrace+0xac/0x138
 |  show_stack+0x30/0x48
 |  dump_stack_lvl+0x60/0xb0
 |  dump_stack+0x18/0x28
 |  __might_resched+0x160/0x270
 |  __might_sleep+0x58/0xb0
 |  down_timeout+0x34/0x98
 |  acpi_os_wait_semaphore+0x7c/0xc0
 |  acpi_ut_acquire_mutex+0x58/0x108
 |  acpi_get_table+0x40/0xe8
 |  acpi_get_pptt+0x48/0xa0
 |  acpi_get_cache_info+0x38/0x140
 |  init_cache_level+0xf4/0x118
 |  detect_cache_attributes+0x2e4/0x640
 |  update_siblings_masks+0x3c/0x330
 |  store_cpu_topology+0x88/0xf0
 |  secondary_start_kernel+0xd0/0x168
 |  __secondary_switched+0xb8/0xc0

Update acpi_get_pptt() to consider the fact that PPTT is once checked and
is not available on the system and return NULL avoiding any attempts to
fetch PPTT and thereby avoiding any possible sleep waiting for a mutex
in the atomic context.

The Linux kernel CVE team has assigned CVE-2023-53070 to this issue.


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

	Issue introduced in 6.0 with commit 0c80f9e165f8f9cca743d7b6cbdb54362da297e0 and fixed in 6.1.21 with commit 1318a07706bb2f8c65f88f39a16c2b5260bcdcd4
	Issue introduced in 6.0 with commit 0c80f9e165f8f9cca743d7b6cbdb54362da297e0 and fixed in 6.2.8 with commit e0c1106d51b9abc8eae03c5522b20649b6a55f6e
	Issue introduced in 6.0 with commit 0c80f9e165f8f9cca743d7b6cbdb54362da297e0 and fixed in 6.3 with commit 91d7b60a65d9f71230ea09b86d2058a884a3c2af
	Issue introduced in 5.19.4 with commit f03d253ba71994b196f342a7acad448a56812a8c

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-2023-53070
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/acpi/pptt.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/1318a07706bb2f8c65f88f39a16c2b5260bcdcd4
	https://git.kernel.org/stable/c/e0c1106d51b9abc8eae03c5522b20649b6a55f6e
	https://git.kernel.org/stable/c/91d7b60a65d9f71230ea09b86d2058a884a3c2af