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From 758ead31c7e17bf17a9ef2e0ca1c3e86ab296b43 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Wed, 29 Nov 2017 23:14:27 +0530
Subject: [PATCH] virtio: check VirtQueue Vring object is set
A guest could attempt to use an uninitialised VirtQueue object
or unset Vring.align leading to a arithmetic exception. Add check
to avoid it.
Upstream-Status: Backport
CVE: CVE-2017-17381
Reported-by: Zhangboxian <zhangboxian@huawei.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Catalin Enache <catalin.enache@windriver.com>
---
hw/virtio/virtio.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 703e672..ad564b0 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -182,7 +182,7 @@ void virtio_queue_update_rings(VirtIODevice *vdev, int n)
{
VRing *vring = &vdev->vq[n].vring;
- if (!vring->desc) {
+ if (!vring->num || !vring->desc || !vring->align) {
/* not yet setup -> nothing to do */
return;
}
@@ -1414,6 +1414,9 @@ void virtio_config_modern_writel(VirtIODevice *vdev,
void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
{
+ if (!vdev->vq[n].vring.num) {
+ return;
+ }
vdev->vq[n].vring.desc = addr;
virtio_queue_update_rings(vdev, n);
}
@@ -1426,6 +1429,9 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
hwaddr avail, hwaddr used)
{
+ if (!vdev->vq[n].vring.num) {
+ return;
+ }
vdev->vq[n].vring.desc = desc;
vdev->vq[n].vring.avail = avail;
vdev->vq[n].vring.used = used;
@@ -1494,8 +1500,10 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
*/
assert(k->has_variable_vring_alignment);
- vdev->vq[n].vring.align = align;
- virtio_queue_update_rings(vdev, n);
+ if (align) {
+ vdev->vq[n].vring.align = align;
+ virtio_queue_update_rings(vdev, n);
+ }
}
static bool virtio_queue_notify_aio_vq(VirtQueue *vq)
--
2.10.2
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