From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20A47C04AB4 for ; Tue, 14 May 2019 18:05:35 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EFD6A20881 for ; Tue, 14 May 2019 18:05:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EFD6A20881 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([127.0.0.1]:51998 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQbny-0004Ds-6n for qemu-devel@archiver.kernel.org; Tue, 14 May 2019 14:05:34 -0400 Received: from eggs.gnu.org ([209.51.188.92]:33177) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hQbln-00030h-Qw for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hQblm-0002YR-Nz for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40676) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hQblm-0002YH-It for qemu-devel@nongnu.org; Tue, 14 May 2019 14:03:18 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DE3E73002619 for ; Tue, 14 May 2019 18:03:17 +0000 (UTC) Received: from blackfin.pond.sub.org (ovpn-116-28.ams2.redhat.com [10.36.116.28]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 76BEE5D720; Tue, 14 May 2019 18:03:14 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id EBE5611385FA; Tue, 14 May 2019 20:03:11 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Date: Tue, 14 May 2019 20:03:06 +0200 Message-Id: <20190514180311.16028-2-armbru@redhat.com> In-Reply-To: <20190514180311.16028-1-armbru@redhat.com> References: <20190514180311.16028-1-armbru@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Tue, 14 May 2019 18:03:17 +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] [PATCH v2 1/6] qemu-bridge-helper: Fix misuse of isspace() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, philmd@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" parse_acl_file() passes char values to isspace(). Undefined behavior when the value is negative. Not a security issue, because the characters come from trusted $prefix/etc/qemu/bridge.conf and the files it includes. Furthermore, isspace()'s locale-dependence means qemu-bridge-helper uses the user's locale for parsing $prefix/etc/bridge.conf. Feels wrong. Use g_ascii_isspace() instead. This fixes the undefined behavior, and makes parsing of $prefix/etc/bridge.conf locale-independent. Signed-off-by: Markus Armbruster --- qemu-bridge-helper.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/qemu-bridge-helper.c b/qemu-bridge-helper.c index 5396fbfbb6..f9940deefd 100644 --- a/qemu-bridge-helper.c +++ b/qemu-bridge-helper.c @@ -75,7 +75,7 @@ static int parse_acl_file(const char *filename, ACLList *acl_list) char *ptr = line; char *cmd, *arg, *argend; - while (isspace(*ptr)) { + while (g_ascii_isspace(*ptr)) { ptr++; } @@ -99,12 +99,12 @@ static int parse_acl_file(const char *filename, ACLList *acl_list) *arg = 0; arg++; - while (isspace(*arg)) { + while (g_ascii_isspace(*arg)) { arg++; } argend = arg + strlen(arg); - while (arg != argend && isspace(*(argend - 1))) { + while (arg != argend && g_ascii_isspace(*(argend - 1))) { argend--; } *argend = 0; -- 2.17.2