CVE-2022-48797 mm: don't try to NUMA-migrate COW pages that have other uses

In the Linux kernel, the following vulnerability has been resolved: mm: don't try to NUMA-migrate COW pages that have other uses Oded Gabbay reports that enabling NUMA balancing causes corruption with his Gaudi accelerator test load: "All the details are in the bug, but the bottom line is that...

CVE-2022-48797

CVE-2022-48797: Linux kernel vulnerability where NUMA balancing could affect COW page writability. Root cause: change_pte_range() tests page_mapcount(page) to enable NUMA faults, which is nonsensical; patch fixes to use page_count(). Oded Gabbay’s report linked a Gaudi accelerator workload; apply...