In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Restrict CO-RE poisoning to relocatable instructions<\/p>\n
CO-RE relocation records can name any instruction offset. When a
\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its
\ntarget before checking whether that instruction is a valid relocation
\ntarget. Malformed metadata can therefore replace jumps, calls, exits,
\nregister-source arithmetic, or non-immediate loads instead of failing at
\nthe relocation step.<\/p>\n
Handle poisoning only after the instruction has passed the same class and
\noperand-form checks used for a resolved relocation. Route invalid forms
\nthrough the existing diagnostic and return a hard error. Keep poisoning
\nsupported instructions, including both halves of a plain ldimm64, so an
\nunresolved relocation in dead code remains valid.<\/p>\n
Extend bpf_core_poison_insn() to poison both halves of ldimm64, and return
\nits status directly from each validated instruction case. This avoids
\nrouting the success path through a common label and leaves the helper free
\nto report errors.<\/p>\n
The shared relocation code applies this restriction to both libbpf and
\nin-kernel CO-RE.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Restrict CO-RE poisoning to relocatable instructions<\/p>\n
CO-RE relocation records can name any instruction offset. When a
\nrelocat<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41098","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41098","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=41098"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41098"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41098"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}