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,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 005E0C3F2D9 for ; Tue, 3 Mar 2020 18:13:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA5692072D for ; Tue, 3 Mar 2020 18:13:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583259218; bh=VqD6tVyfBbHhJji5Ia9DK3sC5AXzCUx+LUQ1GvO/2VQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jXmdHQD1YiW7QRkd7lqDHXofLGRFKtXHjHQbMXgmRT+C9ir85kTDmFM1c3pdxEt6P sAKYTiFUtFpliWBDsUP6b5CulwZiUw3c3jUx22OuJKtG94S1hL+uKRyLu3CKPzwijl FThC7EXszpO5WgUqW2HCIxSutqUr0SYgOlK13H3Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731043AbgCCRqD (ORCPT ); Tue, 3 Mar 2020 12:46:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:52366 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731041AbgCCRqA (ORCPT ); Tue, 3 Mar 2020 12:46:00 -0500 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 564CB20842; Tue, 3 Mar 2020 17:45:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583257559; bh=VqD6tVyfBbHhJji5Ia9DK3sC5AXzCUx+LUQ1GvO/2VQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o9PgyIB8JEtRAQ5nSih+Q031Zx/uJp1o5GwCVaGet0aVX8gfW7AorV3M1SfCb6HK8 z80cXvsMckIjfgcnpN4hMfZxDKHNnR8CVvuTiP4wcn+LRSNfs8d60mZl7duG3bN64m 1RWHBHm2TvLKLlKK/VN119Q8oKUayRjVVnUPKblg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , Cong Wang , Jason Baron , "David S. Miller" Subject: [PATCH 5.5 007/176] net: sched: correct flower port blocking Date: Tue, 3 Mar 2020 18:41:11 +0100 Message-Id: <20200303174305.408899758@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200303174304.593872177@linuxfoundation.org> References: <20200303174304.593872177@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: Jason Baron [ Upstream commit 8a9093c79863b58cc2f9874d7ae788f0d622a596 ] tc flower rules that are based on src or dst port blocking are sometimes ineffective due to uninitialized stack data. __skb_flow_dissect() extracts ports from the skb for tc flower to match against. However, the port dissection is not done when when the FLOW_DIS_IS_FRAGMENT bit is set in key_control->flags. All callers of __skb_flow_dissect(), zero-out the key_control field except for fl_classify() as used by the flower classifier. Thus, the FLOW_DIS_IS_FRAGMENT may be set on entry to __skb_flow_dissect(), since key_control is allocated on the stack and may not be initialized. Since key_basic and key_control are present for all flow keys, let's make sure they are initialized. Fixes: 62230715fd24 ("flow_dissector: do not dissect l4 ports for fragments") Co-developed-by: Eric Dumazet Signed-off-by: Eric Dumazet Acked-by: Cong Wang Signed-off-by: Jason Baron Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/net/flow_dissector.h | 9 +++++++++ net/sched/cls_flower.c | 1 + 2 files changed, 10 insertions(+) --- a/include/net/flow_dissector.h +++ b/include/net/flow_dissector.h @@ -5,6 +5,7 @@ #include #include #include +#include #include struct sk_buff; @@ -349,4 +350,12 @@ struct bpf_flow_dissector { void *data_end; }; +static inline void +flow_dissector_init_keys(struct flow_dissector_key_control *key_control, + struct flow_dissector_key_basic *key_basic) +{ + memset(key_control, 0, sizeof(*key_control)); + memset(key_basic, 0, sizeof(*key_basic)); +} + #endif --- a/net/sched/cls_flower.c +++ b/net/sched/cls_flower.c @@ -305,6 +305,7 @@ static int fl_classify(struct sk_buff *s struct cls_fl_filter *f; list_for_each_entry_rcu(mask, &head->masks, list) { + flow_dissector_init_keys(&skb_key.control, &skb_key.basic); fl_clear_masked_range(&skb_key, mask); skb_flow_dissect_meta(skb, &mask->dissector, &skb_key);