In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Reject negative optlen in cgroup getsockopt hook<\/p>\n
A cgroup getsockopt BPF program can shrink ctx->optlen after the
\nkernel getsockopt handler has run. The kernel-buffer variant, used by
\nTCP_ZEROCOPY_RECEIVE, only rejects values larger than the original
\nlength.<\/p>\n
If BPF writes a negative optlen, that value is accepted and propagated
\nback to the TCP getsockopt code. It can then be passed to
\ncopy_to_sockptr() as a size_t and trigger the hardened usercopy
\nbytes > INT_MAX warning.<\/p>\n
Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(),
\nmatching the lower-bound validation already present in the sockptr-based
\ngetsockopt hook.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Reject negative optlen in cgroup getsockopt hook<\/p>\n
A cgroup getsockopt BPF program can shrink ctx->optlen after the
\nkernel gets<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25566","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25566","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=25566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}