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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 93DC8C7618B for ; Fri, 26 Jul 2019 15:33:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6A9DB20644 for ; Fri, 26 Jul 2019 15:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564155188; bh=UvQ3GpMphQS6WZ9+rvyqG5VtUNQb1BJ8dAojAJtXM9M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=tkdsL0C/Q5xx2xuLv4zW9KG5bqtdVdA63QK1syv5sXQ8MQhmKJOwgQU8fCfE7ov+T 8BxddGACz8MorbN1Gd3hgAg93gEWu8/8tDCXSYTGNvLiKLGS+OFPM5JZCpBfm/3sr8 U08I7vpM6HmKKhJJKOrIUYBxIXEQBGfgpYK8I+Ng= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389193AbfGZPdH (ORCPT ); Fri, 26 Jul 2019 11:33:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:48382 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389578AbfGZPdE (ORCPT ); Fri, 26 Jul 2019 11:33:04 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AD55F20644; Fri, 26 Jul 2019 15:33:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564155183; bh=UvQ3GpMphQS6WZ9+rvyqG5VtUNQb1BJ8dAojAJtXM9M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CVkjm8AGu4mLpJvazXdTl9k+YdiIDcOIYR576EBlnbyDsFsEoBkgjDIzsXZPo12hP +t8OXtmc9uBJM09ZqSFUXb8pPfQ+ccMYXQ0T9a5Ga82N/UgjXMqAMfMmocJop1QnKn xez6Zo1Dld64aHFsjvxkiEJ0zK/Wrtwp901CrhOk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Matteo Croce , David Ahern , "David S. Miller" Subject: [PATCH 4.19 05/50] ipv4: dont set IPv6 only flags to IPv4 addresses Date: Fri, 26 Jul 2019 17:24:40 +0200 Message-Id: <20190726152301.245479388@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190726152300.760439618@linuxfoundation.org> References: <20190726152300.760439618@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matteo Croce [ Upstream commit 2e60546368165c2449564d71f6005dda9205b5fb ] Avoid the situation where an IPV6 only flag is applied to an IPv4 address: # ip addr add 192.0.2.1/24 dev dummy0 nodad home mngtmpaddr noprefixroute # ip -4 addr show dev dummy0 2: dummy0: mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000 inet 192.0.2.1/24 scope global noprefixroute dummy0 valid_lft forever preferred_lft forever Or worse, by sending a malicious netlink command: # ip -4 addr show dev dummy0 2: dummy0: mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000 inet 192.0.2.1/24 scope global nodad optimistic dadfailed home tentative mngtmpaddr noprefixroute stable-privacy dummy0 valid_lft forever preferred_lft forever Signed-off-by: Matteo Croce Reviewed-by: David Ahern Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/devinet.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -66,6 +66,11 @@ #include #include +#define IPV6ONLY_FLAGS \ + (IFA_F_NODAD | IFA_F_OPTIMISTIC | IFA_F_DADFAILED | \ + IFA_F_HOMEADDRESS | IFA_F_TENTATIVE | \ + IFA_F_MANAGETEMPADDR | IFA_F_STABLE_PRIVACY) + static struct ipv4_devconf ipv4_devconf = { .data = { [IPV4_DEVCONF_ACCEPT_REDIRECTS - 1] = 1, @@ -462,6 +467,9 @@ static int __inet_insert_ifa(struct in_i ifa->ifa_flags &= ~IFA_F_SECONDARY; last_primary = &in_dev->ifa_list; + /* Don't set IPv6 only flags to IPv4 addresses */ + ifa->ifa_flags &= ~IPV6ONLY_FLAGS; + for (ifap = &in_dev->ifa_list; (ifa1 = *ifap) != NULL; ifap = &ifa1->ifa_next) { if (!(ifa1->ifa_flags & IFA_F_SECONDARY) &&