From owner-dev-commits-src-branches@freebsd.org Mon Aug 2 19:01:30 2021 Return-Path: Delivered-To: dev-commits-src-branches@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 148FB678DD9; Mon, 2 Aug 2021 19:01:30 +0000 (UTC) (envelope-from git@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 "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4GdnRG06qLz4ql6; Mon, 2 Aug 2021 19:01:30 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (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 did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id E1AF324BCE; Mon, 2 Aug 2021 19:01:29 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 172J1TuJ090064; Mon, 2 Aug 2021 19:01:29 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 172J1Tja090052; Mon, 2 Aug 2021 19:01:29 GMT (envelope-from git) Date: Mon, 2 Aug 2021 19:01:29 GMT Message-Id: <202108021901.172J1Tja090052@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mark Johnston Subject: git: 668a555de619 - stable/13 - rip: Add missing minimum length validation in rip_output() MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: 668a555de619f0894cb233f00f70dc19973c154f Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Aug 2021 19:01:30 -0000 The branch stable/13 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=668a555de619f0894cb233f00f70dc19973c154f commit 668a555de619f0894cb233f00f70dc19973c154f Author: Mark Johnston AuthorDate: 2021-07-26 20:39:18 +0000 Commit: Mark Johnston CommitDate: 2021-08-02 19:01:11 +0000 rip: Add missing minimum length validation in rip_output() If the socket is configured such that the sender is expected to supply the IP header, then we need to verify that it actually did so. Reported by: syzkaller+KMSAN Reviewed by: donner Sponsored by: The FreeBSD Foundation (cherry picked from commit ba21825202737a8b7e90e1ef669c7fe7e7d50325) --- sys/netinet/raw_ip.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/sys/netinet/raw_ip.c b/sys/netinet/raw_ip.c index 1db73a6da68c..996440227145 100644 --- a/sys/netinet/raw_ip.c +++ b/sys/netinet/raw_ip.c @@ -523,8 +523,15 @@ rip_output(struct mbuf *m, struct socket *so, ...) } else { if (m->m_pkthdr.len > IP_MAXPACKET) { m_freem(m); - return(EMSGSIZE); + return (EMSGSIZE); } + if (m->m_pkthdr.len < sizeof(*ip)) { + m_freem(m); + return (EINVAL); + } + m = m_pullup(m, sizeof(*ip)); + if (m == NULL) + return (ENOMEM); ip = mtod(m, struct ip *); hlen = ip->ip_hl << 2; if (m->m_len < hlen) {