79 lines
2.4 KiB
Diff
79 lines
2.4 KiB
Diff
From f167022606b5ccca27a627ae599538ce2348ef67 Mon Sep 17 00:00:00 2001
|
|
Message-Id: <f167022606b5ccca27a627ae599538ce2348ef67.1666780268.git.tredaelli@redhat.com>
|
|
From: Maxime Coquelin <maxime.coquelin@redhat.com>
|
|
Date: Thu, 16 Jun 2022 11:35:56 +0200
|
|
Subject: [PATCH 1/2] vhost: discard too small descriptor chains
|
|
|
|
[ upstream commit 71bd0cc536ad6d84188d947d6f24c17400d8f623 ]
|
|
|
|
This patch discards descriptor chains which are smaller
|
|
than the Virtio-net header size, and ones that are equal.
|
|
|
|
Indeed, such descriptor chains sizes mean there is no
|
|
packet data.
|
|
|
|
This patch also has the advantage of requesting the exact
|
|
packets sizes for the mbufs.
|
|
|
|
CVE-2022-2132
|
|
Fixes: 62250c1d0978 ("vhost: extract split ring handling from Rx and Tx functions")
|
|
Fixes: c3ff0ac70acb ("vhost: improve performance by supporting large buffer")
|
|
Fixes: 84d5204310d7 ("vhost: support async dequeue for split ring")
|
|
|
|
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
|
|
Acked-by: Chenbo Xia <chenbo.xia@intel.com>
|
|
Reviewed-by: David Marchand <david.marchand@redhat.com>
|
|
---
|
|
lib/vhost/virtio_net.c | 21 +++++++++++++++++----
|
|
1 file changed, 17 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
|
|
index 858187d1b0..991a7a2bd4 100644
|
|
--- a/lib/vhost/virtio_net.c
|
|
+++ b/lib/vhost/virtio_net.c
|
|
@@ -2334,10 +2334,10 @@ copy_desc_to_mbuf(struct virtio_net *dev, struct vhost_virtqueue *vq,
|
|
buf_addr = buf_vec[vec_idx].buf_addr;
|
|
buf_len = buf_vec[vec_idx].buf_len;
|
|
|
|
- if (unlikely(buf_len < dev->vhost_hlen && nr_vec <= 1)) {
|
|
- error = -1;
|
|
- goto out;
|
|
- }
|
|
+ /*
|
|
+ * 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))) {
|
|
@@ -2568,6 +2568,14 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
|
|
|
|
update_shadow_used_ring_split(vq, head_idx, 0);
|
|
|
|
+ if (unlikely(buf_len <= dev->vhost_hlen)) {
|
|
+ dropped += 1;
|
|
+ i++;
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ buf_len -= dev->vhost_hlen;
|
|
+
|
|
err = virtio_dev_pktmbuf_prep(dev, pkts[i], buf_len);
|
|
if (unlikely(err)) {
|
|
/*
|
|
@@ -2771,6 +2779,11 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
|
|
VHOST_ACCESS_RO) < 0))
|
|
return -1;
|
|
|
|
+ if (unlikely(buf_len <= dev->vhost_hlen))
|
|
+ return -1;
|
|
+
|
|
+ buf_len -= dev->vhost_hlen;
|
|
+
|
|
if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
|
|
if (!allocerr_warned) {
|
|
VHOST_LOG_DATA(ERR,
|
|
--
|
|
2.37.3
|
|
|