In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Check ancestor frames for rbtree callbacks<\/p>\n
bpf_rbtree_add() invokes its comparator while the caller holds the root
\nlock. The native insertion code retains raw parent and link pointers across
\nthe callback, so the verifier prohibits unlocking, consuming tree nodes,
\nor changing RCU state from that callback.<\/p>\n
in_rbtree_lock_required_cb() only checks the innermost verifier frame.
\nStatic subprogram calls are permitted while holding a spin lock, and such a
\ncall pushes a frame without in_callback_fn set. Consequently, all callback
\nrestrictions disappear in the nested frame. The subprogram can unlock the
\ntree, remove and drop the node being compared, then relock. Native insertion
\nresumes with the stale parent pointer and links freed memory into the tree.<\/p>\n
Walk all active frames for the rbtree callback instead. Benign static
\nsubprograms remain permitted, while callback restrictions follow execution
\ninto nested frames.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Check ancestor frames for rbtree callbacks<\/p>\n
bpf_rbtree_add() invokes its comparator while the caller holds the root
\nlock. The <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29202","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29202","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=29202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}