In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Invalidate RCU pointers after final spin unlock<\/p>\n
In a sleepable BPF program, a spin lock can provide the only RCU protection
\nfor a kptr. The final bpf_spin_unlock() ends that protection, but the
\nverifier leaves the pointer valid. Another CPU can then free the object
\nbefore the pointer is used. A capability-limited runtime PoC triggered a
\ntask_struct use-after-free in __bpf_get_task_stack().<\/p>\n
Record whether the program is in an RCU-protected context before releasing
\nthe lock. Invalidate RCU-protected pointers only when the unlock leaves the
\nfinal such context. This preserves valid pointers in non-sleepable programs
\nand inside an explicit RCU read-side section.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Invalidate RCU pointers after final spin unlock<\/p>\n
In a sleepable BPF program, a spin lock can provide the only RCU protection
\nf<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25726","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25726","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=25726"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25726"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25726"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}