CVE-2024-27002 Information

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.

Reference

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 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/