Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b9c370b61d735a0e5390c42771e7eb21413f7868 before 0f7908a016c092cfdaa16d785fa5099d867bc1a3; affected 8cc22ba3f77c59df5f1ac47d62df51efb28cd868 before b0f4478838be1f1d330061201898fef65bf8fd7c; affected f93e71aea6c60ebff8adbd8941e678302d377869 before ef90508574d7af48420bdc5f7b9a4f1cdd26bc70; affected f93e71aea6c60ebff8adbd8941e678302d377869 before 1e560864159d002b453da42bd2c13a1805515a20; affected 1f2f662c8bec75d1311e063efaa9107435cf16c8; affected 6.1.72 before 6.1.88; affected 6.6.11 before 6.6.29; affected 5.15.147 before 5.16 |
| Linux / Linux | affected 6.7; unaffected 0 before 6.7; unaffected 6.1.88 through 6.1.*; unaffected 6.6.29 through 6.6.*; unaffected 6.7.5 through 6.7.*; unaffected 6.8 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0f7908a016c092cfdaa16d785fa5099d867bc1a3
- https://git.kernel.org/stable/c/b0f4478838be1f1d330061201898fef65bf8fd7c
- https://git.kernel.org/stable/c/ef90508574d7af48420bdc5f7b9a4f1cdd26bc70
- https://git.kernel.org/stable/c/1e560864159d002b453da42bd2c13a1805515a20
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.