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,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 AC3A6C47087 for ; Fri, 28 May 2021 12:14:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D30E611BD for ; Fri, 28 May 2021 12:14:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236711AbhE1MPp (ORCPT ); Fri, 28 May 2021 08:15:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58830 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236705AbhE1MPB (ORCPT ); Fri, 28 May 2021 08:15:01 -0400 Received: from mail-pf1-x42d.google.com (mail-pf1-x42d.google.com [IPv6:2607:f8b0:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 452BEC061343 for ; Fri, 28 May 2021 05:12:35 -0700 (PDT) Received: by mail-pf1-x42d.google.com with SMTP id g18so3098347pfr.2 for ; Fri, 28 May 2021 05:12:35 -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=rk9k9ChEl7Vg+ae/8wyh9IS3nb1o6P9TvR8ucb6RQfk=; b=arqhkqGKXLOp9FYHW7F+1Qvr074ccA2539eWwXlR56VpI8MXOo85su1pyIaHg0BqWu 0NZ7luwzcaR4BGwU4mpiQxcfQqvWeVlG6ySfbP1OtydShiz4i3qBXRSJ5DC8lz/lfcJB O3N6dQpAghVgnGP0GnkiBJiJmx5tBVJ3s/3ktgyUFTQWppk14d2q+EnT5kRK5Dwjgxhs 7XwAjiFEwCCKvCGfk4xUHWOmG6+BVV8sX+nZT0eYl/QHFh0wA8F2CHYPSXk2BvGlKBMO t5KdqmIat2cMwZEhI6pOP6shRpgbiIwUoxmnExevIPF8DeO1tmtzXvTLRwo5UYDLhlij AcCQ== 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=rk9k9ChEl7Vg+ae/8wyh9IS3nb1o6P9TvR8ucb6RQfk=; b=LueUeCU36AH7JN9YkxvWivWNz2Qe8EWl2kx3LeFAfuPHEDmkxMCPNoYDZT0hubW/Wr FFXhTWIz261n73/2Ifuyh+5IhUkZap/RiKvLa/Yn+X/oLXKH4LuMKox6qvGR2NFImnck 3N5jgDsMAg6sl4UdmIYTWdPl9aZZFEI4UOWekGlw75LVH50KMkSfzNV74gkiG45NmUIc bw9wBvQYpVengDOr+i7AtRQr2ONWRlFf/Lhq5MBBUmgghLnslhBQ+zYsQdeMtEI/OqfA bWz2Az0TvbNUxUOFILSslrm1PM+DvFkwxKJm0MHdvCKj6oN34zSrkkKu1Za7nXFJ3rmR qckQ== X-Gm-Message-State: AOAM531EOi+b+fjuAG7I6sEq7ja5t1Ofb6PYy0FggD2ZIWhMz3XFO04o wRMfiVAHmsvF9S86s9kobaAW X-Google-Smtp-Source: ABdhPJxCxfvZSsLHbJBwI8eroHQylFucorI0drDHYYSNCh2VDuiQT518+4R0U1INuo90BpJtJj2vZQ== X-Received: by 2002:a63:5052:: with SMTP id q18mr8594951pgl.349.1622203954848; Fri, 28 May 2021 05:12:34 -0700 (PDT) Received: from localhost ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id c1sm4165321pfo.181.2021.05.28.05.12.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 May 2021 05:12:33 -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 v3] virtio-net: Add validation for used length Date: Fri, 28 May 2021 20:11:57 +0800 Message-Id: <20210528121157.105-1-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 | 28 +++++++++++++++++++++------- 1 file changed, 21 insertions(+), 7 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 073fec4c0df1..01f15b65824c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -732,6 +732,17 @@ static struct sk_buff *receive_small(struct net_device *dev, rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); + 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++; + if (xdp_prog) + goto err_xdp; + + rcu_read_unlock(); + put_page(page); + return NULL; + } if (xdp_prog) { struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; struct xdp_frame *xdpf; @@ -888,6 +899,16 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); + 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++; + if (xdp_prog) + goto err_xdp; + + rcu_read_unlock(); + goto err_skb; + } if (xdp_prog) { struct xdp_frame *xdpf; struct page *xdp_page; @@ -1012,13 +1033,6 @@ 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