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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 988AFC3A5A7 for ; Tue, 3 Sep 2019 20:55:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E87C21883 for ; Tue, 3 Sep 2019 20:55:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727242AbfICUzj (ORCPT ); Tue, 3 Sep 2019 16:55:39 -0400 Received: from correo.us.es ([193.147.175.20]:34182 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726948AbfICUzj (ORCPT ); Tue, 3 Sep 2019 16:55:39 -0400 Received: from antivirus1-rhel7.int (unknown [192.168.2.11]) by mail.us.es (Postfix) with ESMTP id A12DFB6C72 for ; Tue, 3 Sep 2019 22:55:35 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 92A1DDA4CA for ; Tue, 3 Sep 2019 22:55:35 +0200 (CEST) Received: by antivirus1-rhel7.int (Postfix, from userid 99) id 7A6EBB8001; Tue, 3 Sep 2019 22:55:35 +0200 (CEST) Received: from antivirus1-rhel7.int (localhost [127.0.0.1]) by antivirus1-rhel7.int (Postfix) with ESMTP id 709EED2B1F; Tue, 3 Sep 2019 22:55:33 +0200 (CEST) Received: from 192.168.1.97 (192.168.1.97) by antivirus1-rhel7.int (F-Secure/fsigk_smtp/550/antivirus1-rhel7.int); Tue, 03 Sep 2019 22:55:33 +0200 (CEST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/antivirus1-rhel7.int) Received: from us.es (sys.soleta.eu [212.170.55.40]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: 1984lsi) by entrada.int (Postfix) with ESMTPSA id 403494251481; Tue, 3 Sep 2019 22:55:33 +0200 (CEST) Date: Tue, 3 Sep 2019 22:55:34 +0200 X-SMTPAUTHUS: auth mail.us.es From: Pablo Neira Ayuso To: Leonardo Bras Cc: netfilter-devel@vger.kernel.org, coreteam@netfilter.org, bridge@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jozsef Kadlecsik , Florian Westphal , Roopa Prabhu , Nikolay Aleksandrov , "David S. Miller" Subject: Re: [PATCH v4 1/2] netfilter: Terminate rule eval if protocol=IPv6 and ipv6 module is disabled Message-ID: <20190903205534.bxcty7pja5bvru5f@salvia> References: <20190830181354.26279-1-leonardo@linux.ibm.com> <20190830181354.26279-2-leonardo@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190830181354.26279-2-leonardo@linux.ibm.com> User-Agent: NeoMutt/20170113 (1.7.2) X-Virus-Scanned: ClamAV using ClamSMTP Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Fri, Aug 30, 2019 at 03:13:53PM -0300, Leonardo Bras wrote: > If IPv6 is disabled on boot (ipv6.disable=1), but nft_fib_inet ends up > dealing with a IPv6 packet, it causes a kernel panic in > fib6_node_lookup_1(), crashing in bad_page_fault. > > The panic is caused by trying to deference a very low address (0x38 > in ppc64le), due to ipv6.fib6_main_tbl = NULL. > BUG: Kernel NULL pointer dereference at 0x00000038 > > The kernel panic was reproduced in a host that disabled IPv6 on boot and > have to process guest packets (coming from a bridge) using it's ip6tables. > > Terminate rule evaluation when packet protocol is IPv6 but the ipv6 module > is not loaded. Patch is applied, thanks.