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Change History

In the Linux kernel, the following vulnerability has been resolved:

perf/x86/intel/uncore: Skip discovery table for offline dies

This warning can be triggered if NUMA is disabled and the system
boots with fewer CPUs than the number of CPUs in die 0.

WARNING: CPU: 9 PID: 7257 at uncore.c:1157 uncore_pci_pmu_register+0x136/0x160 [intel_uncore]

Currently, the discovery table continues to be parsed even if all CPUs
in the associated die are offline.  This can lead to an array overflow
at "pmu->boxes[die] = box" in uncore_pci_pmu_register(), which may
trigger the warning above or cause other issues.

https://git.kernel.org/stable/c/6cfc187d85f18f976d0fe527d4c6f6171542cc19

https://git.kernel.org/stable/c/7a2cb02437d92ed14fe494d8994056d5bd2c72b4

https://git.kernel.org/stable/c/7b568e9eba2fad89a696f22f0413d44cf4a1f892

https://git.kernel.org/stable/c/cfab2c817d2e7e0bee98d66850246ce842ed5f18

https://git.kernel.org/stable/c/f34feda8e0c9535fee3f8870ce8bab53c2798f71