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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 21BA9C19F3B for ; Tue, 27 Jul 2021 13:30:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05A8661A60 for ; Tue, 27 Jul 2021 13:30:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236791AbhG0NaB (ORCPT ); Tue, 27 Jul 2021 09:30:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:57236 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236938AbhG0NU3 (ORCPT ); Tue, 27 Jul 2021 09:20:29 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5A60361B02; Tue, 27 Jul 2021 13:20:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627392012; bh=6rztR91rHZ3vKiWPeolfiGQVhmqXsBJmtoXkvFV9qeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C/ozA1dXG0m1e3dnRNM9g2BSSmmphWswYEunzWNWGgzt/AvYQcHi3WLo2xvwr7tPL pUtrD5890Rn0xX6hxvxbZr7vMWgfEktPQLdxlBZCwCm/ySI7sMayqGBWHIQo1l3OXm dP3SvfUX/0uL2OsCG1ArxJhDMfsbU7ZeylYC2DuoZy78sM+mqyW78igExArs0inCRt 3r8+MRHOzVUgZi7Sezj041TAFiZ8iRPg4Se3q4sno6TCJgjXH4dVCaDNIki+eI+zix hb/rOb9b9Y3ZE37p/psTklv7WoG1BQVhwxHbrvd3d+0byUbhvR3OI8t6Ae7gvs82Gu B+wQ7PqFXlj7A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Pravin B Shelar , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 7/9] net: Fix zero-copy head len calculation. Date: Tue, 27 Jul 2021 09:19:59 -0400 Message-Id: <20210727132002.835130-7-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727132002.835130-1-sashal@kernel.org> References: <20210727132002.835130-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Pravin B Shelar [ Upstream commit a17ad0961706244dce48ec941f7e476a38c0e727 ] In some cases skb head could be locked and entire header data is pulled from skb. When skb_zerocopy() called in such cases, following BUG is triggered. This patch fixes it by copying entire skb in such cases. This could be optimized incase this is performance bottleneck. ---8<--- kernel BUG at net/core/skbuff.c:2961! invalid opcode: 0000 [#1] SMP PTI CPU: 2 PID: 0 Comm: swapper/2 Tainted: G OE 5.4.0-77-generic #86-Ubuntu Hardware name: OpenStack Foundation OpenStack Nova, BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:skb_zerocopy+0x37a/0x3a0 RSP: 0018:ffffbcc70013ca38 EFLAGS: 00010246 Call Trace: queue_userspace_packet+0x2af/0x5e0 [openvswitch] ovs_dp_upcall+0x3d/0x60 [openvswitch] ovs_dp_process_packet+0x125/0x150 [openvswitch] ovs_vport_receive+0x77/0xd0 [openvswitch] netdev_port_receive+0x87/0x130 [openvswitch] netdev_frame_hook+0x4b/0x60 [openvswitch] __netif_receive_skb_core+0x2b4/0xc90 __netif_receive_skb_one_core+0x3f/0xa0 __netif_receive_skb+0x18/0x60 process_backlog+0xa9/0x160 net_rx_action+0x142/0x390 __do_softirq+0xe1/0x2d6 irq_exit+0xae/0xb0 do_IRQ+0x5a/0xf0 common_interrupt+0xf/0xf Code that triggered BUG: int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, int len, int hlen) { int i, j = 0; int plen = 0; /* length of skb->head fragment */ int ret; struct page *page; unsigned int offset; BUG_ON(!from->head_frag && !hlen); Signed-off-by: Pravin B Shelar Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/core/skbuff.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 99d6f4d1297c..7dba091bc861 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -2921,8 +2921,11 @@ skb_zerocopy_headlen(const struct sk_buff *from) if (!from->head_frag || skb_headlen(from) < L1_CACHE_BYTES || - skb_shinfo(from)->nr_frags >= MAX_SKB_FRAGS) + skb_shinfo(from)->nr_frags >= MAX_SKB_FRAGS) { hlen = skb_headlen(from); + if (!hlen) + hlen = from->len; + } if (skb_has_frag_list(from)) hlen = from->len; -- 2.30.2