In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, cgroup: Fix storage null-ptr-deref after replacing prog<\/p>\n
Syzkaller reported a storage null-ptr-deref issue after replacing prog.
\nThis occurs in the following scenario:
\n1. prog A, an empty prog, is attached to a cgrp.
\n2. prog B uses BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE and calls the
\n bpf_get_local_storage helper.
\n3. link_update is called to replace prog A with prog B.<\/p>\n
The reason is that __cgroup_bpf_replace fails to alloc and assign the
\nrequired cgrp storage for the incoming replacement prog. Consequently,
\nthe new prog inherits an uninit storage, leading to null-ptr-deref panic
\nwhen kick the new prog.<\/p>\n
Fix this by rejecting a link update if new_prog’s cgroup storage is
\nincompatible with link->prog.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, cgroup: Fix storage null-ptr-deref after replacing prog<\/p>\n
Syzkaller reported a storage null-ptr-deref issue after replacing pro<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25659","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25659","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=25659"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25659"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25659"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}