CVE-2021-47187 (GCVE-0-2021-47187)
Vulnerability from cvelistv5
Published
2024-04-10 18:56
Modified
2025-05-04 07:05
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: c3083c80b52c4e29b65ed838d2e66a91b13a3152
Version: c3083c80b52c4e29b65ed838d2e66a91b13a3152
Version: c3083c80b52c4e29b65ed838d2e66a91b13a3152
Version: c3083c80b52c4e29b65ed838d2e66a91b13a3152
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