From owner-svn-src-head@freebsd.org Mon Feb 19 11:14:39 2018 Return-Path: Delivered-To: svn-src-head@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 02CDFF1BA42; Mon, 19 Feb 2018 11:14:38 +0000 (UTC) (envelope-from ae@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 96F3A6EFD1; Mon, 19 Feb 2018 11:14:38 +0000 (UTC) (envelope-from ae@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 889F519CDC; Mon, 19 Feb 2018 11:14:38 +0000 (UTC) (envelope-from ae@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w1JBEcK8022618; Mon, 19 Feb 2018 11:14:38 GMT (envelope-from ae@FreeBSD.org) Received: (from ae@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w1JBEchL022617; Mon, 19 Feb 2018 11:14:38 GMT (envelope-from ae@FreeBSD.org) Message-Id: <201802191114.w1JBEchL022617@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: ae set sender to ae@FreeBSD.org using -f From: "Andrey V. Elsukov" Date: Mon, 19 Feb 2018 11:14:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r329561 - head/sys/netipsec X-SVN-Group: head X-SVN-Commit-Author: ae X-SVN-Commit-Paths: head/sys/netipsec X-SVN-Commit-Revision: 329561 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: 2.1.25 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: Mon, 19 Feb 2018 11:14:39 -0000 Author: ae Date: Mon Feb 19 11:14:38 2018 New Revision: 329561 URL: https://svnweb.freebsd.org/changeset/base/329561 Log: Check packet length to do not make out of bounds access. Also save ah_nxt value to use it later, since ah pointer can become invalid. Reported by: Maxime Villard MFC after: 5 days Modified: head/sys/netipsec/xform_ah.c Modified: head/sys/netipsec/xform_ah.c ============================================================================== --- head/sys/netipsec/xform_ah.c Mon Feb 19 10:59:19 2018 (r329560) +++ head/sys/netipsec/xform_ah.c Mon Feb 19 11:14:38 2018 (r329561) @@ -582,6 +582,16 @@ ah_input(struct mbuf *m, struct secasvar *sav, int ski error = EACCES; goto bad; } + if (skip + authsize + rplen > m->m_pkthdr.len) { + DPRINTF(("%s: bad mbuf length %u (expecting %lu)" + " for packet in SA %s/%08lx\n", __func__, + m->m_pkthdr.len, (u_long) (skip + authsize + rplen), + ipsec_address(&sav->sah->saidx.dst, buf, sizeof(buf)), + (u_long) ntohl(sav->spi))); + AHSTAT_INC(ahs_badauthl); + error = EACCES; + goto bad; + } AHSTAT_ADD(ahs_ibytes, m->m_pkthdr.len - skip - hl); /* Get crypto descriptors. */ @@ -626,6 +636,9 @@ ah_input(struct mbuf *m, struct secasvar *sav, int ski /* Zeroize the authenticator on the packet. */ m_copyback(m, skip + rplen, authsize, ipseczeroes); + /* Save ah_nxt, since ah pointer can become invalid after "massage" */ + hl = ah->ah_nxt; + /* "Massage" the packet headers for crypto processing. */ error = ah_massage_headers(&m, sav->sah->saidx.dst.sa.sa_family, skip, ahx->type, 0); @@ -650,7 +663,7 @@ ah_input(struct mbuf *m, struct secasvar *sav, int ski /* These are passed as-is to the callback. */ xd->sav = sav; - xd->nxt = ah->ah_nxt; + xd->nxt = hl; xd->protoff = protoff; xd->skip = skip; xd->cryptoid = cryptoid;