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| author | Stefano Garzarella <sgarzare@redhat.com> | 2019-11-14 12:57:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-15 05:12:18 +0300 |
| commit | ed8640a9612cfd01e1dac31255cea53023353681 (patch) | |
| tree | a1b3646ed5ce6b6db5c1f4c5e3db8bc704caa948 | |
| parent | 36c5b48b91ac56762ef87e4af76350ed50f119b5 (diff) | |
| download | linux-ed8640a9612cfd01e1dac31255cea53023353681.tar.xz | |
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>
| -rw-r--r-- | drivers/vhost/vsock.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index fdda9ec625ad..dde392b91bb3 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -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); |