In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sunrpc: pin svc_xprt across the asynchronous TLS handshake callback<\/p>\n
svc_tcp_handshake() stores the raw svc_xprt pointer in
\ntls_handshake_args.ta_data and submits the request through
\ntls_server_hello_x509(). The handshake core takes only
\nsock_hold(req->hr_sk); nothing references the embedding struct
\nsvc_sock that svc_tcp_handshake_done() reaches via container_of().<\/p>\n
Two close races leave the in-flight callback writing through a freed
\nsvc_sock. svc_sock_free() calls tls_handshake_cancel() and discards
\nits return value: a false return means handshake_complete() has
\nalready set HANDSHAKE_F_REQ_COMPLETED but hp_done() may not have
\nfinished, yet svc_sock_free() proceeds to kfree(svsk). The
\ncancel-loser fall-through inside svc_tcp_handshake() itself produces
\nthe same window: when wait_for_completion_interruptible_timeout()
\nreturns sk_handshake_done.<\/p>\n
The corruption surfaces as set_bit\/clear_bit RMW into the freed
\nxpt_flags slab slot and as complete_all() walking and writing the
\nfreed wait_queue_head_t list embedded in sk_handshake_done — a
\nslab-corruption primitive, not a benign read. The path is reachable
\non any TLS-enabled NFS server whenever a connection close overlaps
\nthe tlshd downcall delivery window; the interruptible wait means
\nsignal delivery suffices, not just SVC_HANDSHAKE_TO expiry.<\/p>\n
Take svc_xprt_get(xprt) immediately before tls_server_hello_x509()
\nso the in-flight callback owns its own reference. Release it on the
\ntwo edges where the callback is guaranteed not to fire — submission
\nfailure from tls_server_hello_x509() and a successful
\ntls_handshake_cancel() — and at the tail of
\nsvc_tcp_handshake_done() after complete_all().<\/p>\n
[cel: rewrote commit message to describe the actual change]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sunrpc: pin svc_xprt across the asynchronous TLS handshake callback<\/p>\n
svc_tcp_handshake() stores the raw svc_xprt pointer in
\ntls_han<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6846","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6846","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=6846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}