linux-kernel - [PATCH] vhost: make sure log_num < in

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Date:   Wed, 11 Sep 2019 17:44:24 +0800
From:   ">" <duanery.duan@...il.com>
To:     mst@...hat.com, jasowang@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lidongchen@...cent.com, yongduan <yongduan@...cent.com>,
        ruippan <ruippan@...cent.com>
Subject: [PATCH] vhost: make sure log_num < in_num

From: yongduan <yongduan@...cent.com>

The code assumes log_num < in_num everywhere, and that is true as long as
in_num is incremented by descriptor iov count, and log_num by 1. However
this breaks if there's a zero sized descriptor.

As a result, if a malicious guest creates a vring desc with desc.len = 0,
it may cause the host kernel to crash by overflowing the log array. This
bug can be triggered during the VM migration.

There's no need to log when desc.len = 0, so just don't increment log_num
in this case.

Fixes: 3a4d5c94e959 ("vhost_net: a kernel-level virtio server")
Reviewed-by: Lidong Chen <lidongchen@...cent.com>
Signed-off-by: ruippan <ruippan@...cent.com>
Signed-off-by: yongduan <yongduan@...cent.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Tyler Hicks <tyhicks@...onical.com>
---
 drivers/vhost/vhost.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 5dc174a..36ca2cf 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2178,7 +2178,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
 		/* If this is an input descriptor, increment that count. */
 		if (access == VHOST_ACCESS_WO) {
 			*in_num += ret;
-			if (unlikely(log)) {
+			if (unlikely(log && ret)) {
 				log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
 				log[*log_num].len = vhost32_to_cpu(vq, desc.len);
 				++*log_num;
@@ -2319,7 +2319,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
 			/* If this is an input descriptor,
 			 * increment that count. */
 			*in_num += ret;
-			if (unlikely(log)) {
+			if (unlikely(log && ret)) {
 				log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
 				log[*log_num].len = vhost32_to_cpu(vq, desc.len);
 				++*log_num;
-- 
1.8.3.1