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[79.181.48.215]) by smtp.gmail.com with ESMTPSA id a5sm3131833wmb.37.2019.12.10.06.06.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Dec 2019 06:06:01 -0800 (PST) Date: Tue, 10 Dec 2019 09:05:58 -0500 From: "Michael S. Tsirkin" To: Stefano Garzarella Cc: virtualization@lists.linux-foundation.org, Stefan Hajnoczi , Jason Wang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] vhost/vsock: accept only packets with the right dst_cid Message-ID: <20191210090505-mutt-send-email-mst@kernel.org> References: <20191206143912.153583-1-sgarzare@redhat.com> MIME-Version: 1.0 In-Reply-To: <20191206143912.153583-1-sgarzare@redhat.com> X-MC-Unique: 2ljB4v-zNo-9ifNeWLMFpA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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. >=20 > The host should accept only packets where dst_cid is > equal to the host CID. >=20 > Signed-off-by: Stefano Garzarella 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(-) >=20 > 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_w= ork *work) > =09=09virtio_transport_deliver_tap_pkt(pkt); > =20 > =09=09/* Only accept correctly addressed packets */ > -=09=09if (le64_to_cpu(pkt->hdr.src_cid) =3D=3D vsock->guest_cid) > +=09=09if (le64_to_cpu(pkt->hdr.src_cid) =3D=3D vsock->guest_cid && > +=09=09 le64_to_cpu(pkt->hdr.dst_cid) =3D=3D > +=09=09 vhost_transport_get_local_cid()) > =09=09=09virtio_transport_recv_pkt(&vhost_transport, pkt); > =09=09else > =09=09=09virtio_transport_free_pkt(pkt); > --=20 > 2.23.0