In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm: filemap: retain mapped dropbehind folios<\/p>\n
Fault-around can map ready dropbehind folios without going through the
\nnormal page-cache lookup that clears dropbehind. A mapping represents a
\ncompeting cached user, so retain the folio instead of forcibly unmapping
\nit when writeback completes.<\/p>\n
For a mapped folio, folio_unmap_invalidate() can call
\nunmap_mapping_folio(), which takes i_mmap_rwsem and may sleep. Retaining
\nmapped folios avoids this path when folio_end_dropbehind() runs in
\nnon-preemptible task context.<\/p>\n
Tal was able to trigger a sleeping-in-atomic warning due to this [1].<\/p>\n
Unmapped dropbehind folios continue through the existing invalidation path.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm: filemap: retain mapped dropbehind folios<\/p>\n
Fault-around can map ready dropbehind folios without going through the
\nnormal page-ca<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-33292","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/33292","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=33292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=33292"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=33292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}