In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ocfs2: validate lengths in dlm_mig_lockres_handler<\/p>\n
A node receiving a DLM_MIG_LOCKRES message trusts several fields of the
\npeer-supplied dlm_migratable_lockres without validation. num_locks and
\nlockname_len are bounded only on the sending side, and the message is
\nnever checked to actually carry num_locks migratable_lock entries. As a
\nresult dlm_process_recovery_data() walks mres->ml[0..num_locks) past the
\nkmalloc(data_len) copy of the message (an out-of-bounds read that ends in
\na BUG_ON panic), and dlm_init_lockres() copies lockname_len bytes into the
\nfixed 32-byte o2dlm_lockname slab object (a heap out-of-bounds write).
\nBoth are reachable by any node in the domain.<\/p>\n
Validate these fields right after dlm_grab(), before anything uses them —
\nincluding the not-joined error path, which already prints mres->lockname
\nwith the unbounded lockname_len as a %.*s precision. Reject the message
\nunless lockname_len <= DLM_LOCKID_NAME_MAX, num_locks <=
\nDLM_MAX_MIGRATABLE_LOCKS (the bound the sender already asserts), and the
\npayload is large enough to hold the claimed locks. Conforming recovery
\nand migration messages are unaffected.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ocfs2: validate lengths in dlm_mig_lockres_handler<\/p>\n
A node receiving a DLM_MIG_LOCKRES message trusts several fields of the
\npeer-su<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21416","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21416","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=21416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}