From owner-svn-src-stable-12@freebsd.org Sun May 3 16:06:18 2020 Return-Path: Delivered-To: svn-src-stable-12@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 78FBA2E17C0; Sun, 3 May 2020 16:06:18 +0000 (UTC) (envelope-from kp@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 49FW7Z2c1cz3NLL; Sun, 3 May 2020 16:06:18 +0000 (UTC) (envelope-from kp@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 54657DA11; Sun, 3 May 2020 16:06:18 +0000 (UTC) (envelope-from kp@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 043G6IBJ089216; Sun, 3 May 2020 16:06:18 GMT (envelope-from kp@FreeBSD.org) Received: (from kp@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 043G6Ipw089215; Sun, 3 May 2020 16:06:18 GMT (envelope-from kp@FreeBSD.org) Message-Id: <202005031606.043G6Ipw089215@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kp set sender to kp@FreeBSD.org using -f From: Kristof Provost Date: Sun, 3 May 2020 16:06:18 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r360607 - stable/12/sys/netpfil/pf X-SVN-Group: stable-12 X-SVN-Commit-Author: kp X-SVN-Commit-Paths: stable/12/sys/netpfil/pf X-SVN-Commit-Revision: 360607 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 May 2020 16:06:18 -0000 Author: kp Date: Sun May 3 16:06:17 2020 New Revision: 360607 URL: https://svnweb.freebsd.org/changeset/base/360607 Log: MFC r360344: pf: Improve input validation If we pass an anchor name which doesn't exist pfr_table_count() returns -1, which leads to an overflow in mallocarray() and thus a panic. Explicitly check that pfr_table_count() does not return an error. Reported-by: syzbot+bd09d55d897d63d5f4f4@syzkaller.appspotmail.com Modified: stable/12/sys/netpfil/pf/pf_ioctl.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netpfil/pf/pf_ioctl.c ============================================================================== --- stable/12/sys/netpfil/pf/pf_ioctl.c Sun May 3 15:39:10 2020 (r360606) +++ stable/12/sys/netpfil/pf/pf_ioctl.c Sun May 3 16:06:17 2020 (r360607) @@ -3008,7 +3008,8 @@ DIOCCHANGEADDR_error: case DIOCRGETTABLES: { struct pfioc_table *io = (struct pfioc_table *)addr; struct pfr_table *pfrts; - size_t totlen, n; + size_t totlen; + int n; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; @@ -3016,6 +3017,11 @@ DIOCCHANGEADDR_error: } PF_RULES_RLOCK(); n = pfr_table_count(&io->pfrio_table, io->pfrio_flags); + if (n < 0) { + PF_RULES_RUNLOCK(); + error = EINVAL; + break; + } io->pfrio_size = min(io->pfrio_size, n); totlen = io->pfrio_size * sizeof(struct pfr_table); @@ -3039,7 +3045,8 @@ DIOCCHANGEADDR_error: case DIOCRGETTSTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; struct pfr_tstats *pfrtstats; - size_t totlen, n; + size_t totlen; + int n; if (io->pfrio_esize != sizeof(struct pfr_tstats)) { error = ENODEV; @@ -3047,6 +3054,11 @@ DIOCCHANGEADDR_error: } PF_RULES_WLOCK(); n = pfr_table_count(&io->pfrio_table, io->pfrio_flags); + if (n < 0) { + PF_RULES_WUNLOCK(); + error = EINVAL; + break; + } io->pfrio_size = min(io->pfrio_size, n); totlen = io->pfrio_size * sizeof(struct pfr_tstats); @@ -3069,7 +3081,8 @@ DIOCCHANGEADDR_error: case DIOCRCLRTSTATS: { struct pfioc_table *io = (struct pfioc_table *)addr; struct pfr_table *pfrts; - size_t totlen, n; + size_t totlen; + int n; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; @@ -3078,6 +3091,11 @@ DIOCCHANGEADDR_error: PF_RULES_WLOCK(); n = pfr_table_count(&io->pfrio_table, io->pfrio_flags); + if (n < 0) { + PF_RULES_WUNLOCK(); + error = EINVAL; + break; + } io->pfrio_size = min(io->pfrio_size, n); totlen = io->pfrio_size * sizeof(struct pfr_table); @@ -3104,7 +3122,8 @@ DIOCCHANGEADDR_error: case DIOCRSETTFLAGS: { struct pfioc_table *io = (struct pfioc_table *)addr; struct pfr_table *pfrts; - size_t totlen, n; + size_t totlen; + int n; if (io->pfrio_esize != sizeof(struct pfr_table)) { error = ENODEV; @@ -3113,6 +3132,12 @@ DIOCCHANGEADDR_error: PF_RULES_RLOCK(); n = pfr_table_count(&io->pfrio_table, io->pfrio_flags); + if (n < 0) { + PF_RULES_RUNLOCK(); + error = EINVAL; + break; + } + io->pfrio_size = min(io->pfrio_size, n); PF_RULES_RUNLOCK();