Commit ed8640a9 authored Nov 14, 2019 by Stefano Garzarella Committed by David S. Miller Nov 14, 2019

vhost/vsock: refuse CID assigned to the guest->host transport



In a nested VM environment, we have to refuse to assign to a nested
guest the same CID assigned to our guest->host transport.
In this way, the user can use the local CID for loopback.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 36c5b48b

drivers/vhost/vsock.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -718,6 +718,12 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
		if (guest_cid > U32_MAX)
		return -EINVAL;

		/* Refuse if CID is assigned to the guest->host transport (i.e. nested
		* VM), to make the loopback work.
		*/
		if (vsock_find_cid(guest_cid))
		return -EADDRINUSE;

		/* Refuse if CID is already in use */
		mutex_lock(&vhost_vsock_mutex);
		other = vhost_vsock_get(guest_cid);

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