powerpc/perf: Optimize clearing the pending PMI and remove W… (CVE-2022-50118)

Summary

powerpc/perf: Optimize clearing the pending PMI and remove WARN_ON for PMI check in power_pmu_disable

Original description

The description as published by the source.

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

powerpc/perf: Optimize clearing the pending PMI and remove WARN_ON for PMI check in power_pmu_disable

commit 2c9ac51b850d ("powerpc/perf: Fix PMU callbacks to clear
pending PMI before resetting an overflown PMC") added a new
function "pmi_irq_pending" in hw_irq.h. This function is to check
if there is a PMI marked as pending in Paca (PACA_IRQ_PMI).This is
used in power_pmu_disable in a WARN_ON. The intention here is to
provide a warning if there is PMI pending, but no counter is found
overflown.

During some of the perf runs, below warning is hit:

WARNING: CPU: 36 PID: 0 at arch/powerpc/perf/core-book3s.c:1332 power_pmu_disable+0x25c/0x2c0
Modules linked in:

NIP [c000000000141c3c] power_pmu_disable+0x25c/0x2c0
LR [c000000000141c8c] power_pmu_disable+0x2ac/0x2c0
Call Trace:
[c000000baffcfb90] [c000000000141c8c] power_pmu_disable+0x2ac/0x2c0 (unreliable)
[c000000baffcfc10] [c0000000003e2f8c] perf_pmu_disable+0x4c/0x60
[c000000baffcfc30] [c0000000003e3344] group_sched_out.part.124+0x44/0x100
[c000000baffcfc80] [c0000000003e353c] __perf_event_disable+0x13c/0x240
[c000000baffcfcd0] [c0000000003dd334] event_function+0xc4/0x140
[c000000baffcfd20] [c0000000003d855c] remote_function+0x7c/0xa0
[c000000baffcfd50] [c00000000026c394] flush_smp_call_function_queue+0xd4/0x300
[c000000baffcfde0] [c000000000065b24] smp_ipi_demux_relaxed+0xa4/0x100
[c000000baffcfe20] [c0000000000cb2b0] xive_muxed_ipi_ac…

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Affected packages

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.137"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.61"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.18.18"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"5.19.2"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2022-50118 linux Fixed in: 5.10.140-1
Ubuntu UBUNTU-CVE-2022-50118 linux-hwe-edge