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

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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>
This commit is contained in:
Stefano Garzarella 2019-11-14 10:57:50 +01:00 committed by David S. Miller
parent 36c5b48b91
commit ed8640a961
1 changed files with 6 additions and 0 deletions
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6
drivers/vhost/vsock.c
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@ -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);