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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 78DBCC47097 for ; Mon, 31 May 2021 16:43:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 58A3460FDC for ; Mon, 31 May 2021 16:43:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234807AbhEaQot (ORCPT ); Mon, 31 May 2021 12:44:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234018AbhEaOxJ (ORCPT ); Mon, 31 May 2021 10:53:09 -0400 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 97A80C01F001 for ; Mon, 31 May 2021 06:59:14 -0700 (PDT) Received: by mail-pj1-x102d.google.com with SMTP id f3-20020a17090a4a83b02901619627235bso4524800pjh.1 for ; Mon, 31 May 2021 06:59:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ElXRDuCmw0SEZf7krYsHM0+lPZEqdIG1NofDQ2gJtK8=; b=eLtfYCTPZ+gy7IXFcEKe+h4uBfDBgNRv/Tl4pByit8rXqDIi/XXukZHCJZYLGnLYvG 1bFZ1qCpyIZ8sfyykN1Zyvxq1gVojP5wMkBXxFhylevHbmIL1lXTLjG1H2YbQGoh2+gX 0KN2t3AhyErvU4dlzzqkWSdzih5nY54K24CpWzG8awKrUnwzvJsLeqrmFh0/KwszTR0s DL4BfWpqB/1BH7fwsHut0NTiL0m54R09yqJxlRRCaKd4nLlBT+WOScg6qGK/yMFwnRbE aplkaVOPtIpAzyPmqTGofDzMlTdq/T5m9DNNymkVhuQygsFnmIsYW1xPU+SLi4eVkkXZ I3EQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ElXRDuCmw0SEZf7krYsHM0+lPZEqdIG1NofDQ2gJtK8=; b=HqMrZZC+WDsvme8ONDkt6auDWsOyMK5zq16yMd480ljr30CypHvkMBIEoRy4qY4HqD nLPHul1/FCzCW74Vgycz8czi5QpzYJwLXRlmkDSQFu/bCa3JsmRAkY1ff2dGD2DgqEUO r1RQHDFAX0PapKW9ZBI9dXh/O+wUQgg0gqQrlO45hrJxh+Jp17D01J0r2LQslCXfe0Wn ciVkz+EyV3PhozSEiAYz6LtGYlrV07IIk95CA0Tn9Ahx0yeyS2k3vdh9Vfce0v3WOHAR nJ1gnv2ptEk+J0gULoc+RoiHTT9IdndDHwEG75VtPeMbphGLOHboGpRZWg6brsqtvzNI +10A== X-Gm-Message-State: AOAM5308omVGZjCKoh7nL4hoQcftbNoSlezBHDddeNT8cEV4Bj2BZ4Nq wxypQh4HkZ5i4mO14ZB8y0bJybx3YvNV X-Google-Smtp-Source: ABdhPJzbq32IEkUykPGhPRHegPvNO+SK7zrkq9BiknlxPVrEYOMiqQyv/a2g1V45EXL7j3YrYkE4Lg== X-Received: by 2002:a17:90a:950c:: with SMTP id t12mr18877822pjo.135.1622469554187; Mon, 31 May 2021 06:59:14 -0700 (PDT) Received: from localhost ([139.177.225.235]) by smtp.gmail.com with ESMTPSA id t12sm4352602pfc.133.2021.05.31.06.59.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 May 2021 06:59:11 -0700 (PDT) From: Xie Yongji To: mst@redhat.com, jasowang@redhat.com, kuba@kernel.org Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4] virtio-net: Add validation for used length Date: Mon, 31 May 2021 21:58:52 +0800 Message-Id: <20210531135852.113-1-xieyongji@bytedance.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds validation for used length (might come from an untrusted device) to avoid data corruption or loss. Signed-off-by: Xie Yongji --- 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 073fec4c0df1..ed969b65126e 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -730,6 +730,12 @@ 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) { @@ -833,6 +839,7 @@ 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: @@ -886,6 +893,12 @@ 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) { @@ -1012,13 +1025,6 @@ 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; -- 2.11.0