From owner-svn-src-head@freebsd.org Sun Dec 13 23:51:52 2020 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 09B624C7FAE; Sun, 13 Dec 2020 23:51:52 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CvLsM6xrzz3QGc; Sun, 13 Dec 2020 23:51:51 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id D73FE18423; Sun, 13 Dec 2020 23:51:51 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 0BDNppkp008797; Sun, 13 Dec 2020 23:51:51 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 0BDNppv3008796; Sun, 13 Dec 2020 23:51:51 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <202012132351.0BDNppv3008796@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Sun, 13 Dec 2020 23:51:51 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r368622 - head/sys/netinet X-SVN-Group: head X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: head/sys/netinet X-SVN-Commit-Revision: 368622 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 13 Dec 2020 23:51:52 -0000 Author: tuexen Date: Sun Dec 13 23:51:51 2020 New Revision: 368622 URL: https://svnweb.freebsd.org/changeset/base/368622 Log: Harden the handling of outgoing streams in case of an restart or INIT collision. This avouds an out-of-bounce access in case the peer can break the cookie signature. Thanks to Felix Wilhelm from Google for reporting the issue. MFC after: 1 week Modified: head/sys/netinet/sctp_input.c Modified: head/sys/netinet/sctp_input.c ============================================================================== --- head/sys/netinet/sctp_input.c Sun Dec 13 23:32:50 2020 (r368621) +++ head/sys/netinet/sctp_input.c Sun Dec 13 23:51:51 2020 (r368622) @@ -1699,7 +1699,9 @@ sctp_process_cookie_existing(struct mbuf *m, int iphle NULL); } asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); - asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); + if (asoc->pre_open_streams < asoc->streamoutcnt) { + asoc->pre_open_streams = asoc->streamoutcnt; + } if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { /* @@ -1831,7 +1833,9 @@ sctp_process_cookie_existing(struct mbuf *m, int iphle /* move to OPEN state, if not in SHUTDOWN_SENT */ SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); } - asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); + if (asoc->pre_open_streams < asoc->streamoutcnt) { + asoc->pre_open_streams = asoc->streamoutcnt; + } asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; @@ -2108,7 +2112,6 @@ sctp_process_cookie_new(struct mbuf *m, int iphlen, in /* process the INIT-ACK info (my info) */ asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); - asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;