CVE - CVE-2023-53070

CVE-ID
CVE-2023-53070	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1318a07706bb2f8c65f88f39a16c2b5260bcdcd4 URL:https://git.kernel.org/stable/c/1318a07706bb2f8c65f88f39a16c2b5260bcdcd4 MISC:https://git.kernel.org/stable/c/91d7b60a65d9f71230ea09b86d2058a884a3c2af URL:https://git.kernel.org/stable/c/91d7b60a65d9f71230ea09b86d2058a884a3c2af MISC:https://git.kernel.org/stable/c/e0c1106d51b9abc8eae03c5522b20649b6a55f6e URL:https://git.kernel.org/stable/c/e0c1106d51b9abc8eae03c5522b20649b6a55f6e
Assigning CNA
kernel.org
Date Record Created
20250502	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250502)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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