Deadlock Affecting kernel-rt-modules package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS9-KERNELRTMODULES-6274657
- published25 Feb 2024
- disclosed24 Feb 2024
Introduced: 24 Feb 2024
CVE-2024-26605 (opens in a new tab)How to fix?
There is no fixed version for Centos:9 kernel-rt-modules.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules package and not the kernel-rt-modules package as distributed by Centos.
See How to fix? for Centos:9 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
PCI/ASPM: Fix deadlock when enabling ASPM
A last minute revert in 6.7-final introduced a potential deadlock when enabling ASPM during probe of Qualcomm PCIe controllers as reported by lockdep:
============================================ WARNING: possible recursive locking detected 6.7.0 #40 Not tainted
kworker/u16:5/90 is trying to acquire lock: ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pcie_aspm_pm_state_change+0x58/0xdc
but task is already holding lock:
ffffacfa78ced000 (pci_bus_sem){++++}-{3:3}, at: pci_walk_bus+0x34/0xbc
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 ---- lock(pci_bus_sem); lock(pci_bus_sem);*** DEADLOCK ***
Call trace: print_deadlock_bug+0x25c/0x348 __lock_acquire+0x10a4/0x2064 lock_acquire+0x1e8/0x318 down_read+0x60/0x184 pcie_aspm_pm_state_change+0x58/0xdc pci_set_full_power_state+0xa8/0x114 pci_set_power_state+0xc4/0x120 qcom_pcie_enable_aspm+0x1c/0x3c [pcie_qcom] pci_walk_bus+0x64/0xbc qcom_pcie_host_post_init_2_7_0+0x28/0x34 [pcie_qcom]
The deadlock can easily be reproduced on machines like the Lenovo ThinkPad X13s by adding a delay to increase the race window during asynchronous probe where another thread can take a write lock.
Add a new pci_set_power_state_locked() and associated helper functions that can be called with the PCI bus semaphore held to avoid taking the read lock twice.
References
- https://access.redhat.com/security/cve/CVE-2024-26605
- https://git.kernel.org/stable/c/0f7908a016c092cfdaa16d785fa5099d867bc1a3
- https://git.kernel.org/stable/c/1e560864159d002b453da42bd2c13a1805515a20
- https://git.kernel.org/stable/c/b0f4478838be1f1d330061201898fef65bf8fd7c
- https://git.kernel.org/stable/c/ef90508574d7af48420bdc5f7b9a4f1cdd26bc70