In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, skmsg: fix verdict sk_data_ready racing with ktls rx<\/p>\n
sk_psock_strp_data_ready() already checks tls_sw_has_ctx_rx() and
\ndefers to psock->saved_data_ready when a TLS RX context is present,
\navoiding a conflict with the TLS strparser’s ownership of the receive
\nqueue (commit e91de6afa81c, “bpf: Fix running sk_skb program types
\nwith ktls”).<\/p>\n
sk_psock_verdict_data_ready() has no equivalent guard. When a socket
\nis inserted into a sockmap (BPF_SK_SKB_VERDICT) before TLS RX is
\nconfigured, tls_sw_strparser_arm() saves sk_psock_verdict_data_ready
\nas rx_ctx->saved_data_ready. On data arrival:<\/p>\n
tls_data_ready -> tls_strp_data_ready -> tls_rx_msg_ready
\n -> saved_data_ready() = sk_psock_verdict_data_ready()
\n -> tcp_read_skb() drains sk_receive_queue via __skb_unlink()
\n without calling tcp_eat_skb(), so copied_seq is not advanced.<\/p>\n
tls_strp_msg_load() then finds tcp_inq() >= full_len (stale), calls
\ntcp_recv_skb() on the now-empty queue, hits WARN_ON_ONCE(!first), and
\nreturns with rx_ctx->strp.anchor.frag_list pointing at a psock-owned
\n(potentially freed) skb. tls_decrypt_sg() subsequently walks that
\nfrag_list: use-after-free.<\/p>\n
Apply the same fix as sk_psock_strp_data_ready(): if a TLS RX context
\nis present, call psock->saved_data_ready (sock_def_readable) to wake
\nrecv() waiters and return immediately, leaving the receive queue
\nuntouched. TLS retains sole ownership of the queue and decrypts the
\nrecord normally through tls_sw_recvmsg().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf, skmsg: fix verdict sk_data_ready racing with ktls rx<\/p>\n
sk_psock_strp_data_ready() already checks tls_sw_has_ctx_rx() and
\ndefers<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15018","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15018","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=15018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}