From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id C7C77A0542; Mon, 29 Aug 2022 17:10:07 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id A79884069D; Mon, 29 Aug 2022 17:10:07 +0200 (CEST) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mails.dpdk.org (Postfix) with ESMTP id 5E90A4003C for ; Mon, 29 Aug 2022 17:10:06 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1661785805; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E9C2FMjt/2K6Nh4kbdYEPTyAC1E/7ZBODKhs8qG0wXE=; b=Pt8SHAU6NYembgp0AMo50a6WeWpiIMZirQJ5Lx8P/6iLpMzvry5HngUNCaxSv0a/SkG+FL itacx/SncQj3mBaXOwuDeEyzoHjhfyT7gxlAVSjJOdaEEo3DNnIjzya3OuIowrKk6caNL4 BNPHsusV+6qxN2mTRHvFTfafHA2lwDc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-399-0I6ZJbZPN1q1cU47N2gMiw-1; Mon, 29 Aug 2022 11:10:04 -0400 X-MC-Unique: 0I6ZJbZPN1q1cU47N2gMiw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 3A491180A380; Mon, 29 Aug 2022 15:10:04 +0000 (UTC) Received: from fchome.redhat.com (unknown [10.40.193.251]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2D37040CF8E4; Mon, 29 Aug 2022 15:10:03 +0000 (UTC) From: David Marchand To: dev@dpdk.org Cc: Maxime Coquelin , stable@dpdk.org, Chenbo Xia , Tiwei Bie Subject: [PATCH 2/2] vhost: fix header spanned across more than two descriptors Date: Mon, 29 Aug 2022 17:09:36 +0200 Message-Id: <20220829150936.1455069-2-david.marchand@redhat.com> In-Reply-To: <20220829150936.1455069-1-david.marchand@redhat.com> References: <20220829150936.1455069-1-david.marchand@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org From: Maxime Coquelin This patch aims at supporting the unlikely case where a Virtio-net header is spanned across more than two descriptors. CVE-2022-2132 Fixes: fd68b4739d2c ("vhost: use buffer vectors in dequeue path") Cc: stable@dpdk.org Signed-off-by: Maxime Coquelin Acked-by: Chenbo Xia Reviewed-by: David Marchand --- lib/vhost/virtio_net.c | 45 +++++++++++++----------------------------- 1 file changed, 14 insertions(+), 31 deletions(-) diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c index 757d8dee17..270c71a54e 100644 --- a/lib/vhost/virtio_net.c +++ b/lib/vhost/virtio_net.c @@ -2664,26 +2664,22 @@ desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq, uint32_t buf_avail, buf_offset, buf_len; uint64_t buf_addr, buf_iova; uint32_t mbuf_avail, mbuf_offset; + uint32_t hdr_remain = dev->vhost_hlen; uint32_t cpy_len; struct rte_mbuf *cur = m, *prev = m; struct virtio_net_hdr tmp_hdr; struct virtio_net_hdr *hdr = NULL; - /* A counter to avoid desc dead loop chain */ - uint16_t vec_idx = 0; + uint16_t vec_idx; struct vhost_async *async = vq->async; struct async_inflight_info *pkts_info; - buf_addr = buf_vec[vec_idx].buf_addr; - buf_iova = buf_vec[vec_idx].buf_iova; - buf_len = buf_vec[vec_idx].buf_len; - /* * The caller has checked the descriptors chain is larger than the * header size. */ if (virtio_net_with_host_offload(dev)) { - if (unlikely(buf_len < sizeof(struct virtio_net_hdr))) { + if (unlikely(buf_vec[0].buf_len < sizeof(struct virtio_net_hdr))) { /* * No luck, the virtio-net header doesn't fit * in a contiguous virtual area. @@ -2691,36 +2687,23 @@ desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq, copy_vnet_hdr_from_desc(&tmp_hdr, buf_vec); hdr = &tmp_hdr; } else { - hdr = (struct virtio_net_hdr *)((uintptr_t)buf_addr); + hdr = (struct virtio_net_hdr *)((uintptr_t)buf_vec[0].buf_addr); } } - /* - * A virtio driver normally uses at least 2 desc buffers - * for Tx: the first for storing the header, and others - * for storing the data. - */ - if (unlikely(buf_len < dev->vhost_hlen)) { - buf_offset = dev->vhost_hlen - buf_len; - vec_idx++; - buf_addr = buf_vec[vec_idx].buf_addr; - buf_iova = buf_vec[vec_idx].buf_iova; - buf_len = buf_vec[vec_idx].buf_len; - buf_avail = buf_len - buf_offset; - } else if (buf_len == dev->vhost_hlen) { - if (unlikely(++vec_idx >= nr_vec)) - goto error; - buf_addr = buf_vec[vec_idx].buf_addr; - buf_iova = buf_vec[vec_idx].buf_iova; - buf_len = buf_vec[vec_idx].buf_len; + for (vec_idx = 0; vec_idx < nr_vec; vec_idx++) { + if (buf_vec[vec_idx].buf_len > hdr_remain) + break; - buf_offset = 0; - buf_avail = buf_len; - } else { - buf_offset = dev->vhost_hlen; - buf_avail = buf_vec[vec_idx].buf_len - dev->vhost_hlen; + hdr_remain -= buf_vec[vec_idx].buf_len; } + buf_addr = buf_vec[vec_idx].buf_addr; + buf_iova = buf_vec[vec_idx].buf_iova; + buf_len = buf_vec[vec_idx].buf_len; + buf_offset = hdr_remain; + buf_avail = buf_vec[vec_idx].buf_len - hdr_remain; + PRINT_PACKET(dev, (uintptr_t)(buf_addr + buf_offset), (uint32_t)buf_avail, 0); -- 2.37.2