From patchwork Mon Jul 29 08:33:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 1138248 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 45xtLV4Tq1z9s3l for ; Mon, 29 Jul 2019 18:35:46 +1000 (AEST) Received: from localhost ([::1]:50476 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs18C-0006sH-Jb for incoming@patchwork.ozlabs.org; Mon, 29 Jul 2019 04:35:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48023) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hs16T-0004Sc-7d for qemu-devel@nongnu.org; Mon, 29 Jul 2019 04:33:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hs16Q-0003F8-SU for qemu-devel@nongnu.org; Mon, 29 Jul 2019 04:33:56 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43470) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hs16Q-0003Ek-LR for qemu-devel@nongnu.org; Mon, 29 Jul 2019 04:33:54 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E1E7F308FC5F; Mon, 29 Jul 2019 08:33:53 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (ovpn-12-203.pek2.redhat.com [10.72.12.203]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2B5D410190AA; Mon, 29 Jul 2019 08:33:51 +0000 (UTC) From: Jason Wang To: qemu-devel@nongnu.org, peter.maydell@linaro.org Date: Mon, 29 Jul 2019 16:33:43 +0800 Message-Id: <1564389226-4489-3-git-send-email-jasowang@redhat.com> In-Reply-To: <1564389226-4489-1-git-send-email-jasowang@redhat.com> References: <1564389226-4489-1-git-send-email-jasowang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Mon, 29 Jul 2019 08:33:53 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 2/5] qemu-bridge-helper: restrict interface name to IFNAMSIZ X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , Prasad J Pandit Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Prasad J Pandit The network interface name in Linux is defined to be of size IFNAMSIZ(=16), including the terminating null('\0') byte. The same is applied to interface names read from 'bridge.conf' file to form ACL rules. If user supplied '--br=bridge' name is not restricted to the same length, it could lead to ACL bypass issue. Restrict interface name to IFNAMSIZ, including null byte. Reported-by: Riccardo Schirone Signed-off-by: Prasad J Pandit Reviewed-by: Stefan Hajnoczi Reviewed-by: Daniel P. Berrangé Reviewed-by: Li Qiang Signed-off-by: Jason Wang --- qemu-bridge-helper.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c index 95624bc..2058e10 100644 --- a/qemu-bridge-helper.c +++ b/qemu-bridge-helper.c @@ -119,6 +119,13 @@ static int parse_acl_file(const char *filename, ACLList *acl_list) } *argend = 0; + if (!g_str_equal(cmd, "include") && strlen(arg) >= IFNAMSIZ) { + fprintf(stderr, "name `%s' too long: %zu\n", arg, strlen(arg)); + fclose(f); + errno = EINVAL; + return -1; + } + if (strcmp(cmd, "deny") == 0) { acl_rule = g_malloc(sizeof(*acl_rule)); if (strcmp(arg, "all") == 0) { @@ -269,6 +276,10 @@ int main(int argc, char **argv) usage(); return EXIT_FAILURE; } + if (strlen(bridge) >= IFNAMSIZ) { + fprintf(stderr, "name `%s' too long: %zu\n", bridge, strlen(bridge)); + return EXIT_FAILURE; + } /* parse default acl file */ QSIMPLEQ_INIT(&acl_list);