In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Mark sched_process_wait argument as nullable<\/p>\n
do_wait() passes wo->wo_pid to the sched_process_wait tracepoint.
\nkernel_wait4() leaves wo_pid NULL for wait4(-1), and
\nkernel_waitid_prepare() does likewise for waitid(P_ALL).<\/p>\n
btf_ctx_access() currently types argument 0 as PTR_TO_BTF_ID |
\nPTR_TRUSTED. Without PTR_MAYBE_NULL, the verifier accepts an unchecked
\ndereference. Trusted pointer loads have no fault protection, so a wait for
\nany child can then cause a NULL pointer dereference in JITed BPF code.<\/p>\n
Add sched_process_wait to raw_tp_null_args[] with argument 0 marked
\nnullable. The verifier rejects an unchecked dereference while preserving
\naccess after the program checks the pointer for NULL.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Mark sched_process_wait argument as nullable<\/p>\n
do_wait() passes wo->wo_pid to the sched_process_wait tracepoint.
\nkernel_wait4()<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-29214","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/29214","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=29214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=29214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=29214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}