CVE-2021-47187

arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency

published April 10, 2024

CVSS
—
EPSS
0%
Percentile
12.5
In the wild
Unconfirmed
What it is

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

arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency

The entry/exit latency and minimum residency in state for the idle

states of MSM8998 were ..bad: first of all, for all of them the

timings were written for CPU sleep but the min-residency-us param

was miscalculated (supposedly, while porting this from downstream);

Then, the power collapse states are setting PC on both the CPU

cluster *and* the L2 cache, which have different timings: in the

specific case of L2 the times are higher so these ones should be

taken into account instead of the CPU ones.

This parameter misconfiguration was not giving particular issues

because on MSM8998 there was no CPU scaling at all, so cluster/L2

power collapse was rarely (if ever) hit.

When CPU scaling is enabled, though, the wrong timings will produce

SoC unstability shown to the user as random, apparently error-less,

sudden reboots and/or lockups.

This set of parameters are stabilizing the SoC when CPU scaling is

ON and when power collapse is frequently hit.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00225 · 12.5th percentile
Published
2024-04-10T18:56Z
EPSS history
Timeline
  • 10 APR 18:56Z
    arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency
    cvelistv5