CVE-2024-35872

In the Linux kernel, the following vulnerability has been resolved:

mm/secretmem: fix GUP-fast succeeding on secretmem folios

folio_is_secretmem() currently relies on secretmem folios being LRU

folios, to save some cycles.

However, folios might reside in a folio batch without the LRU flag set, or

temporarily have their LRU flag cleared. Consequently, the LRU flag is

unreliable for this purpose.

In particular, this is the case when secretmem_fault() allocates a fresh

page and calls filemap_add_folio()->folio_add_lru(). The folio might be

added to the per-cpu folio batch and won't get the LRU flag set until the

batch was drained using e.g., lru_add_drain().

Consequently, folio_is_secretmem() might not detect secretmem folios and

GUP-fast can succeed in grabbing a secretmem folio, crashing the kernel

when we would later try reading/writing to the folio, because the folio

has been unmapped from the directmap.

Fix it by removing that unreliable check.