[dpdk-stable] patch 'vhost: fix dead loop in enqueue path' has been queued to stable release 16.11.1

[Yuanhan Liu]

Hi,

FYI, your patch has been queued to stable release 16.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable
yet. It will be pushed if I get no objections before 02/18/17.
So please shout if anyone has objections.

Thanks.

	--yliu

---
>From 9e9efea9b6ab8abf73c5d1560f7ed500d27a4146 Mon Sep 17 00:00:00 2001
From: Yuanhan Liu <yuanhan.liu at linux.intel.com>
Date: Sun, 22 Jan 2017 16:46:58 +0800
Subject: [PATCH] vhost: fix dead loop in enqueue path

[ upstream commit cc7301908c031a288eeb6c12db21b938755b67ee ]

If a malicious guest forges a dead loop desc chain (let desc->next point
to itself) and desc->len is zero, this could lead to a dead loop in
copy_mbuf_to_desc(following is a simplified code to show this issue
clearly):

    while (mbuf_is_not_totally_consumed) {
        if (desc_avail == 0) {
            desc = &descs[desc->next];
            desc_avail = desc->len;
        }

        COPY(desc, mbuf, desc_avail);
    }

I have actually fixed a same issue before: commit a436f53ebfeb ("vhost:
avoid dead loop chain"); it fixes the dequeue path though, leaving the
enqueue path still vulnerable.

The fix is the same. Add a var nr_desc to avoid the dead loop.

Fixes: f1a519ad981c ("vhost: fix enqueue/dequeue to handle chained vring descriptors")

Reported-by: Xieming Katty <katty.xieming at huawei.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu at linux.intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
---
 lib/librte_vhost/virtio_net.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 595f67c..143c0fa 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -195,6 +195,8 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs,
 	struct vring_desc *desc;
 	uint64_t desc_addr;
 	struct virtio_net_hdr_mrg_rxbuf virtio_hdr = {{0, 0, 0, 0, 0, 0}, 0};
+	/* A counter to avoid desc dead loop chain */
+	uint16_t nr_desc = 1;
 
 	desc = &descs[desc_idx];
 	desc_addr = gpa_to_vva(dev, desc->addr);
@@ -233,7 +235,7 @@ copy_mbuf_to_desc(struct virtio_net *dev, struct vring_desc *descs,
 				/* Room in vring buffer is not enough */
 				return -1;
 			}
-			if (unlikely(desc->next >= size))
+			if (unlikely(desc->next >= size || ++nr_desc > size))
 				return -1;
 
 			desc = &descs[desc->next];
-- 
1.9.0