In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
libbpf: Reject non-exclusive metadata maps in the signed loader<\/p>\n
The loader verifies map->sha against the metadata hash in its
\ninstructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is
\ncalled on the frozen map.<\/p>\n
While the map is frozen, the \/signed loader\/ must also ensure the map
\nis exclusive, as, without exclusivity (which a hostile host could just
\nomit when loading the loader), another BPF program with map access can
\nmutate the contents afterwards, so the check passes on stale data.<\/p>\n
With the extra check as part of the signed loader, it now refuses to
\nmove on with map->sha validation if the host set it up wrongly.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
libbpf: Reject non-exclusive metadata maps in the signed loader<\/p>\n
The loader verifies map->sha against the metadata hash in its
\ninst<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12334","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12334","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=12334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}