CVE-2024-27003

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

clk: Get runtime PM before walking tree for clk_summary

Similar to the previous commit, we should make sure that all devices are runtime resumed before printing the clk_summary through debugfs. Failure to do so would result in a deadlock if the thread is resuming a device to print clk state and that device is also runtime resuming in another thread, e.g the screen is turning on and the display driver is starting up. We remove the calls to clk_pm_runtime_{get,put}() in this path because theyre superfluous now that we know the devices are runtime resumed. This also squashes a bug where the return value of clk_pm_runtime_get() wasnt checked, leading to an RPM count underflow on error paths.

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/2c077fdfd09dffb31a890e5095c8ab205138a42e
• https://git.kernel.org/stable/c/83ada89e4a86e2b28ea2b5113c76d6dc7560a4d0
• https://git.kernel.org/stable/c/9d1e795f754db1ac3344528b7af0b17b8146f321
• https://git.kernel.org/stable/c/b457105309d388e4081c716cf7b81d517ff74db4
• https://git.kernel.org/stable/c/2c077fdfd09dffb31a890e5095c8ab205138a42e
• https://git.kernel.org/stable/c/83ada89e4a86e2b28ea2b5113c76d6dc7560a4d0
• https://git.kernel.org/stable/c/9d1e795f754db1ac3344528b7af0b17b8146f321
• https://git.kernel.org/stable/c/b457105309d388e4081c716cf7b81d517ff74db4