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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 044AAECAAD5 for ; Fri, 2 Sep 2022 12:54:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237847AbiIBMyh (ORCPT ); Fri, 2 Sep 2022 08:54:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238100AbiIBMxs (ORCPT ); Fri, 2 Sep 2022 08:53:48 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 562C93B973; Fri, 2 Sep 2022 05:38:08 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 600EBB829E5; Fri, 2 Sep 2022 12:33:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6DEAC433D7; Fri, 2 Sep 2022 12:33:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1662122034; bh=PLtZJf+Wm46YI8pm5QFdb+mj1OBebtzjoLY6V0ztVpc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZNdXZ6OCqz9NqiJSyzc0VeC465JPsaXshBiEnybNbKs4oSO/71q+eQEsxGih0iLAH NPh+HoF3lHI75WAOzgykpgKHcA7sZhPqhW75GWtlfWeVa93zP/cj9MdVHyChNYA/LU jpcegdPnsgj3E9aevQ92i43e821lqKgHfVYM4ykc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+7a12909485b94426aceb@syzkaller.appspotmail.com, Zhengchao Shao , Stanislav Fomichev , Alexei Starovoitov Subject: [PATCH 5.15 34/73] bpf: Dont redirect packets with invalid pkt_len Date: Fri, 2 Sep 2022 14:18:58 +0200 Message-Id: <20220902121405.571447887@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220902121404.435662285@linuxfoundation.org> References: <20220902121404.435662285@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Zhengchao Shao commit fd1894224407c484f652ad456e1ce423e89bb3eb upstream. Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any skbs, that is, the flow->head is null. The root cause, as the [2] says, is because that bpf_prog_test_run_skb() run a bpf prog which redirects empty skbs. So we should determine whether the length of the packet modified by bpf prog or others like bpf_prog_test is valid before forwarding it directly. LINK: [1] https://syzkaller.appspot.com/bug?id=0b84da80c2917757915afa89f7738a9d16ec96c5 LINK: [2] https://www.spinics.net/lists/netdev/msg777503.html Reported-by: syzbot+7a12909485b94426aceb@syzkaller.appspotmail.com Signed-off-by: Zhengchao Shao Reviewed-by: Stanislav Fomichev Link: https://lore.kernel.org/r/20220715115559.139691-1-shaozhengchao@huawei.com Signed-off-by: Alexei Starovoitov Signed-off-by: Greg Kroah-Hartman --- include/linux/skbuff.h | 8 ++++++++ net/bpf/test_run.c | 3 +++ net/core/dev.c | 1 + 3 files changed, 12 insertions(+) --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2328,6 +2328,14 @@ static inline void skb_set_tail_pointer( #endif /* NET_SKBUFF_DATA_USES_OFFSET */ +static inline void skb_assert_len(struct sk_buff *skb) +{ +#ifdef CONFIG_DEBUG_NET + if (WARN_ONCE(!skb->len, "%s\n", __func__)) + DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); +#endif /* CONFIG_DEBUG_NET */ +} + /* * Add data to an sk_buff */ --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -469,6 +469,9 @@ static int convert___skb_to_skb(struct s { struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; + if (!skb->len) + return -EINVAL; + if (!__skb) return 0; --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4147,6 +4147,7 @@ static int __dev_queue_xmit(struct sk_bu bool again = false; skb_reset_mac_header(skb); + skb_assert_len(skb); if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED);