From owner-svn-src-all@freebsd.org Sat Nov 10 03:00:37 2018 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 0E2AC1122C9B; Sat, 10 Nov 2018 03:00:37 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 9109773725; Sat, 10 Nov 2018 03:00:36 +0000 (UTC) (envelope-from markj@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 71FDD1D01E; Sat, 10 Nov 2018 03:00:36 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wAA30a78095618; Sat, 10 Nov 2018 03:00:36 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAA30awQ095617; Sat, 10 Nov 2018 03:00:36 GMT (envelope-from markj@FreeBSD.org) Message-Id: <201811100300.wAA30awQ095617@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Sat, 10 Nov 2018 03:00:36 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340313 - head/sys/netinet X-SVN-Group: head X-SVN-Commit-Author: markj X-SVN-Commit-Paths: head/sys/netinet X-SVN-Commit-Revision: 340313 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 9109773725 X-Spamd-Result: default: False [-106.87 / 200.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; ALLOW_DOMAIN_WHITELIST(-100.00)[FreeBSD.org]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; DMARC_NA(0.00)[FreeBSD.org]; RCVD_COUNT_THREE(0.00)[4]; MX_GOOD(-0.01)[cached: mx1.FreeBSD.org]; NEURAL_HAM_SHORT(-1.00)[-1.000,0]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; IP_SCORE(-3.76)[ip: (-9.91), ipnet: 2610:1c1:1::/48(-4.93), asn: 11403(-3.88), country: US(-0.09)] X-Rspamd-Server: mx1.freebsd.org 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: Sat, 10 Nov 2018 03:00:37 -0000 Author: markj Date: Sat Nov 10 03:00:36 2018 New Revision: 340313 URL: https://svnweb.freebsd.org/changeset/base/340313 Log: Ensure that IP fragments do not extend beyond IP_MAXPACKET. Such fragments are obviously invalid, and when processed may end up violating the sort order (by offset) of fragments of a given packet. This doesn't appear to be exploitable, however. Reviewed by: emaste Discussed with: jtl MFC after: 3 days Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17914 Modified: head/sys/netinet/ip_reass.c Modified: head/sys/netinet/ip_reass.c ============================================================================== --- head/sys/netinet/ip_reass.c Sat Nov 10 02:37:56 2018 (r340312) +++ head/sys/netinet/ip_reass.c Sat Nov 10 03:00:36 2018 (r340313) @@ -228,6 +228,16 @@ ip_reass(struct mbuf *m) ip->ip_off = htons(ntohs(ip->ip_off) << 3); /* + * Make sure the fragment lies within a packet of valid size. + */ + if (ntohs(ip->ip_len) + ntohs(ip->ip_off) > IP_MAXPACKET) { + IPSTAT_INC(ips_toolong); + IPSTAT_INC(ips_fragdropped); + m_freem(m); + return (NULL); + } + + /* * Attempt reassembly; if it succeeds, proceed. * ip_reass() will return a different mbuf. */