Fixed
Created: Mar 26, 2024
Updated: Apr 27, 2024
Resolved Date: Apr 19, 2024
Found In Version: 10.23.30.1
Fix Version: 10.23.30.9
Severity: Standard
Applicable for: Wind River Linux LTS 23
Component/s: Kernel
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 avoids unexpected operation to other devices
at the same DEVFN.
Tested-by Klara Modin <klarasmodin@gmail.com>
CREATE(Triage):(User=admin) CVE-2024-26650 (https://nvd.nist.gov/vuln/detail/CVE-2024-26650)
