Linux Kernel Pinctrl Qcom MSM GPIO Interrupt Validation Vulnerability

A vulnerability in the Linux kernel's pinctrl Qualcomm MSM driver allows user-space to crash the kernel by sending invalid GPIO interrupt requests. This issue arises on some platforms where the UFS-reset pin, lacking interrupt logic, is incorrectly registered as a GPIO. The vulnerability affects several versions of the Linux kernel.

Impact

Exploitation of this vulnerability can lead to a kernel crash, caused by an invalid GPIO interrupt request from user-space.

Reproduction

The vulnerability can be reproduced by using the 'gpiomon' command to monitor a GPIO pin that has been improperly configured to handle interrupts. This will trigger a BUG() in the pinctrl-msm driver, causing a kernel crash.

Remediation

The vulnerability has been addressed in the official Linux Git repository. Users can upgrade to the latest version to apply the fix.