On Fri, Dec 06, 2019 at 03:39:12PM +0100, Stefano Garzarella wrote: > When we receive a new packet from the guest, we check if the > src_cid is correct, but we forgot to check the dst_cid. > > The host should accept only packets where dst_cid is > equal to the host CID. > > Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx> what's the implication of processing incorrect dst cid? I think mostly it's malformed guests, right? Everyone else just passes the known host cid ... > --- > drivers/vhost/vsock.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c > index 50de0642dea6..c2d7d57e98cf 100644 > --- a/drivers/vhost/vsock.c > +++ b/drivers/vhost/vsock.c > @@ -480,7 +480,9 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) > virtio_transport_deliver_tap_pkt(pkt); > > /* Only accept correctly addressed packets */ > - if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) > + if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid && > + le64_to_cpu(pkt->hdr.dst_cid) == > + vhost_transport_get_local_cid()) > virtio_transport_recv_pkt(&vhost_transport, pkt); > else > virtio_transport_free_pkt(pkt); > -- > 2.23.0 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
