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=-20.4 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 B1257C11F70 for ; Tue, 6 Jul 2021 11:17:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1A8461CBF for ; Tue, 6 Jul 2021 11:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232985AbhGFLTn (ORCPT ); Tue, 6 Jul 2021 07:19:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:53758 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232417AbhGFLSP (ORCPT ); Tue, 6 Jul 2021 07:18:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C8C34610F7; Tue, 6 Jul 2021 11:15:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570136; bh=V1WhxOyIFQLqjiaF2oJZ07H6AUOjeRoOfxJ0qS2zPMc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LGcI2lOL3cAktC9C/GKk0aSuLLE3fvQ6fKXP126KJcOXL3aUbXysCQKldkyf5O9u1 kmkptbip3/VOQHGFEhW/lO2pT7N9QPJJnQthC2nlxXaxFqoQDGOEX+MfWhUFP7lz++ dAaEfYUWJXHd8jQnYqWsxLRgKD3f3d1Q3oLvchYx8pdmaWfinWU2etut7mAFCLRvwi dAkQuMSJ/2Vmg6nlJ5Fi/FnV5HiMPKBXbcNNlGvh/di4NM0xJmyg7fUl89BBNRAjJk sP6Xt/iqKcXHXD9eC8HXbCXDNP0oKpOTL5L4CeLLQJwD8dleP9eNLsrrfLvTp9wW79 bXERlVHnWp6hA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xie Yongji , Jason Wang , Jakub Kicinski , Sasha Levin , virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 062/189] virtio-net: Add validation for used length Date: Tue, 6 Jul 2021 07:12:02 -0400 Message-Id: <20210706111409.2058071-62-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org> References: <20210706111409.2058071-1-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: Xie Yongji [ Upstream commit ad993a95c508417acdeb15244109e009e50d8758 ] This adds validation for used length (might come from an untrusted device) to avoid data corruption or loss. Signed-off-by: Xie Yongji Acked-by: Jason Wang Link: https://lore.kernel.org/r/20210531135852.113-1-xieyongji@bytedance.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/virtio_net.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 78a01c71a17c..252f6718d730 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -721,6 +721,12 @@ static struct sk_buff *receive_small(struct net_device *dev, len -= vi->hdr_len; stats->bytes += len; + if (unlikely(len > GOOD_PACKET_LEN)) { + pr_debug("%s: rx error: len %u exceeds max size %d\n", + dev->name, len, GOOD_PACKET_LEN); + dev->stats.rx_length_errors++; + goto err_len; + } rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (xdp_prog) { @@ -824,6 +830,7 @@ static struct sk_buff *receive_small(struct net_device *dev, err_xdp: rcu_read_unlock(); stats->xdp_drops++; +err_len: stats->drops++; put_page(page); xdp_xmit: @@ -877,6 +884,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, head_skb = NULL; stats->bytes += len - vi->hdr_len; + if (unlikely(len > truesize)) { + pr_debug("%s: rx error: len %u exceeds truesize %lu\n", + dev->name, len, (unsigned long)ctx); + dev->stats.rx_length_errors++; + goto err_skb; + } rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (xdp_prog) { @@ -1004,13 +1017,6 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, } rcu_read_unlock(); - if (unlikely(len > truesize)) { - pr_debug("%s: rx error: len %u exceeds truesize %lu\n", - dev->name, len, (unsigned long)ctx); - dev->stats.rx_length_errors++; - goto err_skb; - } - head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, metasize, headroom); curr_skb = head_skb; -- 2.30.2