CVE-2022-49210 Information

Description

In the Linux kernel the following vulnerability has been resolved:

MIPS: pgalloc: fix memory leak caused by pgd_free()

pgd page is freed by generic implementation pgd_free() since commit f9cb654cb550 (sm-generic: pgalloc: provide generic pgd_free()) however there are scenarios that the system uses more than one page as the pgd table in such cases the generic implementation pgd_free() won’t be applicable anymore. For example when PAGE_SIZE_4KB is enabled and MIPS_VA_BITS_48 is not enabled in a 64bit system the macro \PGD_ORDER\nwill be set as \1\ which will cause allocating two pages as the pgd table. Well at the same time the generic implementation pgd_free() just free one pgd page which will result in the memory leak.

The memory leak can be easily detected by executing shell command: \while true; do ls > /dev/null; grep MemFree /proc/meminfo; done\

Reference

https://git.kernel.org/stable/c/1bf0d78c8cc3cf615a6e7bf33ada70b73592f0a1 https://git.kernel.org/stable/c/2bc5bab9a763d520937e4f3fe8df51c6a1eceb97 https://git.kernel.org/stable/c/5a8501d34b261906e4c76ec9da679f2cb4d309ed https://git.kernel.org/stable/c/d29cda15cab086d82d692de016f7249545d4b6b4 https://git.kernel.org/stable/c/fa3d44424579972cc7c4fac3d9cf227798ebdfa0