Связанные уязвимости
[REJECTED CVE] A deadlock issue was identified in the Linux kernel within the platform/x86 P2SB subsystem. The issue arises when the p2sb_bar() function, used to unhide the P2SB device for resource retrieval, locks pci_rescan_remove_lock during PCI device probing. If a PCI bus rescan is triggered (e.g., via /sys/bus/pci/rescan), it can lead to a deadlock when the rescan also locks pci_rescan_remove_lock and probes devices that call p2sb_bar(). This deadlock could cause a system hang or unresponsiveness during PCI bus rescans or device probing, affecting system stability.
In the Linux kernel, the following vulnerability has been resolved: platform/x86: p2sb: Allow p2sb_bar() calls during PCI device probe p2sb_bar() unhides P2SB device to get resources from the device. It guards the operation by locking pci_rescan_remove_lock so that parallel rescans do not find the P2SB device. However, this lock causes deadlock when PCI bus rescan is triggered by /sys/bus/pci/rescan. The rescan locks pci_rescan_remove_lock and probes PCI devices. When PCI devices call p2sb_bar() during probe, it locks pci_rescan_remove_lock again. Hence the deadlock. To avoid the deadlock, do not lock pci_rescan_remove_lock in p2sb_bar(). Instead, do the lock at fs_initcall. Introduce p2sb_cache_resources() for fs_initcall which gets and caches the P2SB resources. At p2sb_bar(), refer the cache and return to the caller. Before operating the device at P2SB DEVFN for resource cache, check that its device class is PCI_CLASS_MEMORY_OTHER 0x0580 that PCH specifications define. This a...
Уязвимость функции p2sb_bar() в модуле drivers/platform/x86/p2sb.c ядра операционной системы Linux, позволяющая нарушителю вызвать отказ в обслуживании
