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.