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CVE-2024-27002

Disclosure Date: May 01, 2024 •
CVE-2024-27002
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Description

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

clk: mediatek: Do a runtime PM get on controllers during probe

mt8183-mfgcfg has a mutual dependency with genpd during the probing
stage, which leads to a deadlock in the following call stack:

CPU0: genpd_lock —> clk_prepare_lock
genpd_power_off_work_fn()
genpd_lock()
generic_pm_domain::power_off()

clk_unprepare()
  clk_prepare_lock()

CPU1: clk_prepare_lock —> genpd_lock
clk_register()
__clk_core_init()

clk_prepare_lock()
clk_pm_runtime_get()
  genpd_lock()

Do a runtime PM get at the probe function to make sure clk_register()
won’t acquire the genpd lock. Instead of only modifying mt8183-mfgcfg,
do this on all mediatek clock controller probings because we don’t
believe this would cause any regression.

Verified on MT8183 and MT8192 Chromebooks.

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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OS
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Vulnerable Versions
Linux 165d22647257
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis