Vulnerability CVE-2024-27002
Published: 2024-05-01

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.

 References:
https://git.kernel.org/stable/c/165d226472575b213dd90dfda19d1605dd7c19a8
https://git.kernel.org/stable/c/c0dcd5c072e2a3fff886f673e6a5d9bf8090c4cc
https://git.kernel.org/stable/c/b62ed25feb342eab052822eff0c554873799a4f5
https://git.kernel.org/stable/c/2f7b1d8b5505efb0057cd1ab85fca206063ea4c3
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