Linux Kernel Boot Memory Management Vulnerability in Kmemleak Handling

A vulnerability in the Linux kernel's boot memory management has been addressed. The issue arose because vmemmap pages, when allocated from memblock, were incorrectly marked by kmemleak. This could lead to kmemleak reporting errors upon reusing the pages, causing the kernel memory leak detector to disable itself. The vulnerability has been resolved by ensuring that vmemmap pages are removed from kmemleak when they are freed, preventing these errors and allowing kmemleak to function properly.

Impact

This vulnerability could cause the kernel memory leak detector to be disabled, leading to undetected memory leaks in the kernel.