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=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=unavailable 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 E75FAC5B57D for ; Tue, 2 Jul 2019 08:11:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B287B206A2 for ; Tue, 2 Jul 2019 08:11:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562055087; bh=M8uNbf5C5Dv07j5Z0jsDVLzZ4LOS6A5mloiQFrU7MXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rJ2Bn0uZsX/c9uNCFNql+DZFGAnHjUR1ZZT1hUQeh+P7CQ3GxXUBUmsYkdL2UH8OV AySOver/gJUhZMPnIZE78WsPCJXhNKvekJD33Q8y9FCWNdQFkNAtfOy0Ib4GCE5o7+ 9osW2oA1iQCB+HpIcgh9DntBcJ8FkbvQIwqB42TQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728653AbfGBIK1 (ORCPT ); Tue, 2 Jul 2019 04:10:27 -0400 Received: from mail.kernel.org ([198.145.29.99]:58644 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727844AbfGBIKT (ORCPT ); Tue, 2 Jul 2019 04:10:19 -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 118C320665; Tue, 2 Jul 2019 08:10:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562055018; bh=M8uNbf5C5Dv07j5Z0jsDVLzZ4LOS6A5mloiQFrU7MXY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NVxOG4tSuDET+y5c0c/mTM928jiopGknvBr5m///qvHK5lI2AFj4d6HnlgQ1mYuZ1 c/8HSm5gwxHB71D9fPN/ZMSWjrll5gJOm0teyAc9wBOrs9qIR/RieniPkZXdFw5JUP Rc3QLeTyxGRBRHxCCtbup2TlerksGfv55AYtSb+M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Craig Gallek , Martin KaFai Lau , Song Liu , Alexei Starovoitov , Daniel Borkmann Subject: [PATCH 4.14 39/43] bpf: udp: ipv6: Avoid running reuseports bpf_prog from __udp6_lib_err Date: Tue, 2 Jul 2019 10:02:19 +0200 Message-Id: <20190702080125.937515818@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190702080123.904399496@linuxfoundation.org> References: <20190702080123.904399496@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Martin KaFai Lau commit 4ac30c4b3659efac031818c418beb51e630d512d upstream. __udp6_lib_err() may be called when handling icmpv6 message. For example, the icmpv6 toobig(type=2). __udp6_lib_lookup() is then called which may call reuseport_select_sock(). reuseport_select_sock() will call into a bpf_prog (if there is one). reuseport_select_sock() is expecting the skb->data pointing to the transport header (udphdr in this case). For example, run_bpf_filter() is pulling the transport header. However, in the __udp6_lib_err() path, the skb->data is pointing to the ipv6hdr instead of the udphdr. One option is to pull and push the ipv6hdr in __udp6_lib_err(). Instead of doing this, this patch follows how the original commit 538950a1b752 ("soreuseport: setsockopt SO_ATTACH_REUSEPORT_[CE]BPF") was done in IPv4, which has passed a NULL skb pointer to reuseport_select_sock(). Fixes: 538950a1b752 ("soreuseport: setsockopt SO_ATTACH_REUSEPORT_[CE]BPF") Cc: Craig Gallek Signed-off-by: Martin KaFai Lau Acked-by: Song Liu Acked-by: Craig Gallek Signed-off-by: Alexei Starovoitov Signed-off-by: Daniel Borkmann Signed-off-by: Greg Kroah-Hartman --- net/ipv6/udp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -506,7 +506,7 @@ void __udp6_lib_err(struct sk_buff *skb, struct net *net = dev_net(skb->dev); sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, - inet6_iif(skb), 0, udptable, skb); + inet6_iif(skb), 0, udptable, NULL); if (!sk) { __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);