From owner-dev-commits-src-main@freebsd.org Thu Feb 25 22:44:34 2021 Return-Path: Delivered-To: dev-commits-src-main@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 90D5554C42A; Thu, 25 Feb 2021 22:44:34 +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 4DmnsZ3hxpz3sZX; Thu, 25 Feb 2021 22:44:34 +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 719D61FF82; Thu, 25 Feb 2021 22:44:34 +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 11PMiYED026969; Thu, 25 Feb 2021 22:44:34 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 11PMiYld026968; Thu, 25 Feb 2021 22:44:34 GMT (envelope-from git) Date: Thu, 25 Feb 2021 22:44:34 GMT Message-Id: <202102252244.11PMiYld026968@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Kristof Provost Subject: git: 5f1b1f184b7f - main - pf: Fix incorrect fragment handling MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kp X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 5f1b1f184b7f12330cf4a027e3db7c6700c67640 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Feb 2021 22:44:34 -0000 The branch main has been updated by kp: URL: https://cgit.FreeBSD.org/src/commit/?id=5f1b1f184b7f12330cf4a027e3db7c6700c67640 commit 5f1b1f184b7f12330cf4a027e3db7c6700c67640 Author: Kristof Provost AuthorDate: 2021-02-25 07:07:36 +0000 Commit: Kristof Provost CommitDate: 2021-02-25 20:51:08 +0000 pf: Fix incorrect fragment handling A sequence of overlapping IPv4 fragments could crash the kernel in pf due to an assertion. Reported by: Alexander Bluhm Obtained from: OpenBSD MFC after: 3 days Sponsored by: Rubicon Communications, LLC ("Netgate") --- sys/netpfil/pf/pf_norm.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/sys/netpfil/pf/pf_norm.c b/sys/netpfil/pf/pf_norm.c index b7a84437630b..d7310c7bccb4 100644 --- a/sys/netpfil/pf/pf_norm.c +++ b/sys/netpfil/pf/pf_norm.c @@ -549,6 +549,7 @@ pf_fillup_fragment(struct pf_fragment_cmp *key, struct pf_frent *frent, struct pf_frent *after, *next, *prev; struct pf_fragment *frag; uint16_t total; + int old_index, new_index; PF_FRAG_ASSERT(); @@ -660,8 +661,30 @@ pf_fillup_fragment(struct pf_fragment_cmp *key, struct pf_frent *frent, DPFPRINTF(("adjust overlap %d\n", aftercut)); if (aftercut < after->fe_len) { m_adj(after->fe_m, aftercut); + old_index = pf_frent_index(after); after->fe_off += aftercut; after->fe_len -= aftercut; + new_index = pf_frent_index(after); + if (old_index != new_index) { + DPFPRINTF(("frag index %d, new %d", + old_index, new_index)); + /* Fragment switched queue as fe_off changed */ + after->fe_off -= aftercut; + after->fe_len += aftercut; + /* Remove restored fragment from old queue */ + pf_frent_remove(frag, after); + after->fe_off += aftercut; + after->fe_len -= aftercut; + /* Insert into correct queue */ + if (pf_frent_insert(frag, after, prev)) { + DPFPRINTF( + ("fragment requeue limit exceeded")); + m_freem(after->fe_m); + uma_zfree(V_pf_frent_z, after); + /* There is not way to recover */ + goto bad_fragment; + } + } break; }