From owner-svn-src-all@freebsd.org Wed Jan 16 11:33:49 2019 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id EBF051484756; Wed, 16 Jan 2019 11:33:48 +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) server-signature RSA-PSS (4096 bits) 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 9399897FE8; Wed, 16 Jan 2019 11:33:48 +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 80C9A19AC; Wed, 16 Jan 2019 11:33:48 +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 x0GBXmiH003396; Wed, 16 Jan 2019 11:33:48 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x0GBXmmV003394; Wed, 16 Jan 2019 11:33:48 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <201901161133.x0GBXmmV003394@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Wed, 16 Jan 2019 11:33:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r343089 - head/sys/netinet X-SVN-Group: head X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: head/sys/netinet X-SVN-Commit-Revision: 343089 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 9399897FE8 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.96 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.96)[-0.965,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-0.999,0] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Jan 2019 11:33:49 -0000 Author: tuexen Date: Wed Jan 16 11:33:47 2019 New Revision: 343089 URL: https://svnweb.freebsd.org/changeset/base/343089 Log: Limit the user-controllable amount of memory the kernel allocates via IPPROTO_SCTP level socket options. This issue was found by running syzkaller. MFC after: 1 week Modified: head/sys/netinet/sctp_constants.h head/sys/netinet/sctp_usrreq.c Modified: head/sys/netinet/sctp_constants.h ============================================================================== --- head/sys/netinet/sctp_constants.h Wed Jan 16 10:33:51 2019 (r343088) +++ head/sys/netinet/sctp_constants.h Wed Jan 16 11:33:47 2019 (r343089) @@ -983,6 +983,9 @@ __FBSDID("$FreeBSD$"); ((((uint8_t *)&(a)->s_addr)[0] == 169) && \ (((uint8_t *)&(a)->s_addr)[1] == 254)) +/* Maximum size of optval for IPPROTO_SCTP level socket options. */ +#define SCTP_SOCKET_OPTION_LIMIT (64 * 1024) + #if defined(_KERNEL) #define SCTP_GETTIME_TIMEVAL(x) (getmicrouptime(x)) Modified: head/sys/netinet/sctp_usrreq.c ============================================================================== --- head/sys/netinet/sctp_usrreq.c Wed Jan 16 10:33:51 2019 (r343088) +++ head/sys/netinet/sctp_usrreq.c Wed Jan 16 11:33:47 2019 (r343089) @@ -6828,6 +6828,10 @@ sctp_ctloutput(struct socket *so, struct sockopt *sopt return (error); } optsize = sopt->sopt_valsize; + if (optsize > SCTP_SOCKET_OPTION_LIMIT) { + SCTP_LTRACE_ERR_RET(so->so_pcb, NULL, NULL, SCTP_FROM_SCTP_USRREQ, ENOBUFS); + return (ENOBUFS); + } if (optsize) { SCTP_MALLOC(optval, void *, optsize, SCTP_M_SOCKOPT); if (optval == NULL) {