Linux Kernel TH1520 AXI Clock Management Vulnerability

A vulnerability in the Linux kernel's handling of AXI clocks on the TH1520 platform can lead to system hangs. The issue arises because the AXI crossbar lacks proper timeout management, allowing gated AXI clocks to cause bus timeouts and freeze the system. This vulnerability affects several versions of the Linux kernel.

Impact

Gating AXI clocks without proper timeout handling can lead to bus timeouts and system hangs.

Remediation

All AXI clock gates should be set to 'CLK_IS_CRITICAL' to prevent gating issues. Current usages of 'CLK_IGNORE_UNUSED' should also be converted to 'CLK_IS_CRITICAL'. Instructions for applying this change can be found in the Linux kernel commit references.