CVE-2024-35993 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mm: turn folio_test_hugetlb into a PageType

The current folio_test_hugetlb() can be fooled by a concurrent folio split into returning true for a folio which has never belonged to hugetlbfs. This can’t happen if the caller holds a refcount on it but we have a few places (memory-failure compaction procfs) which do not and should not take a speculative reference.

Since hugetlb pages do not use individual page mapcounts (they are always fully mapped and use the entire_mapcount field to record the number of mappings) the PageType field is available now that page_mapcount() ignores the value in this field.

In compaction and with CONFIG_DEBUG_VM enabled the current implementation can result in an oops as reported by Luis. This happens since 9c5ccf2db04b (\mm: remove HUGETLB_PAGE_DTOR) effectively added some VM_BUG_ON() checks in the PageHuge() testing path.

[willy@infradead.org: update vmcoreinfo] Link: https://lkml.kernel.org/r/ZgGZUvsdhaT1Va-T@casper.infradead.org

Reference

https://git.kernel.org/stable/c/2431b5f2650dfc47ce782d1ca7b02d6b3916976f https://git.kernel.org/stable/c/9fdcc5b6359dfdaa52a55033bf50e2cedd66eb32 https://git.kernel.org/stable/c/d99e3140a4d33e26066183ff727d8f02f56bec64