CVE-2024-27002

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() wont acquire the genpd lock. Instead of only modifying mt8183-mfgcfg, do this on all mediatek clock controller probings because we dont believe this would cause any regression.

Verified on MT8183 and MT8192 Chromebooks.

Weakness

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Software

Extended Description

Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/25.html
• https://cwe.mitre.org/data/definitions/26.html
• https://cwe.mitre.org/data/definitions/27.html

References

• https://git.kernel.org/stable/c/165d226472575b213dd90dfda19d1605dd7c19a8
• https://git.kernel.org/stable/c/2f7b1d8b5505efb0057cd1ab85fca206063ea4c3
• https://git.kernel.org/stable/c/b62ed25feb342eab052822eff0c554873799a4f5
• https://git.kernel.org/stable/c/c0dcd5c072e2a3fff886f673e6a5d9bf8090c4cc
• https://git.kernel.org/stable/c/165d226472575b213dd90dfda19d1605dd7c19a8
• https://git.kernel.org/stable/c/2f7b1d8b5505efb0057cd1ab85fca206063ea4c3
• https://git.kernel.org/stable/c/b62ed25feb342eab052822eff0c554873799a4f5
• https://git.kernel.org/stable/c/c0dcd5c072e2a3fff886f673e6a5d9bf8090c4cc
• 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/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/