In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/util: don’t read __page_2 for order-1 folios in snapshot_page()<\/p>\n
snapshot_page() currently reads __page_2 after checking nr_pages > 1, but
\nit should only do so when nr_pages > 2.<\/p>\n
If an order-1 folio is allocated at the end of a vmemmap section,
\n__page_2 will not exist and reading it will cause a fault.<\/p>\n
During DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed
\non the page isolation path while reading an order-1 folio’s __page_2 from
\nan adjacent absent section (unmapped vmemmap).<\/p>\n
Fix this to avoid reading memmap that doesn’t exist (e.g., a vmemmap
\nhole).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/util: don’t read __page_2 for order-1 folios in snapshot_page()<\/p>\n
snapshot_page() currently reads __page_2 after checking nr_page<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12342","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12342","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=12342"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12342"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}