In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Use array_map_meta_equal for percpu array inner map replacement<\/p>\n
percpu_array_map_ops.map_meta_equal points to the generic
\nbpf_map_meta_equal(), which does not compare max_entries. When a
\npercpu array serves as an inner map, replacing it with one that has
\nfewer max_entries bypasses the check. Since percpu_array_map_gen_lookup()
\ninlines the original template’s index_mask as a JIT immediate, a lookup
\non the replacement map can access pptrs[] out of bounds.<\/p>\n
Point percpu_array_map_ops.map_meta_equal to array_map_meta_equal(),
\nwhich already enforces the max_entries equality check.<\/p>\n
Add a selftest to verify that replacing a percpu array inner map with
\na differently-sized one is rejected.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Use array_map_meta_equal for percpu array inner map replacement<\/p>\n
percpu_array_map_ops.map_meta_equal points to the generic
\nbpf<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-34939","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/34939","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=34939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=34939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=34939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}