netdev - [PATCH 09/10] vhost/vsock: implement copy

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Date:   Thu, 21 Oct 2021 16:37:13 +0400
From:   Marc-André Lureau <marcandre.lureau@...hat.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, sgarzare@...hat.com,
        davem@...emloft.net, kuba@...nel.org,
        Marc-André Lureau <marcandre.lureau@...hat.com>
Subject: [PATCH 09/10] vhost/vsock: implement copy_peercred

Set the socket peercred to the vhost owner.

Signed-off-by: Marc-André Lureau <marcandre.lureau@...hat.com>
---
 drivers/vhost/vsock.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 3067436cddfc..fb492c53631d 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -308,6 +308,27 @@ vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
 	return len;
 }
 
+static void vhost_transport_copy_peercred(struct sock *sk, struct virtio_vsock_pkt *pkt)
+{
+	struct vhost_vsock *vsock;
+
+	put_pid(sk->sk_peer_pid);
+	sk->sk_peer_pid = NULL;
+	put_cred(sk->sk_peer_cred);
+	sk->sk_peer_cred = NULL;
+
+	rcu_read_lock();
+	vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.src_cid));
+	if (!vsock)
+		goto out;
+
+	sk->sk_peer_pid = get_pid(vsock->owner_pid);
+	sk->sk_peer_cred = get_cred(vsock->owner_cred);
+
+out:
+	rcu_read_unlock();
+}
+
 static int
 vhost_transport_cancel_pkt(struct vsock_sock *vsk)
 {
@@ -474,6 +495,7 @@ static struct virtio_transport vhost_transport = {
 	},
 
 	.send_pkt = vhost_transport_send_pkt,
+	.copy_peercred = vhost_transport_copy_peercred,
 };
 
 static bool vhost_transport_seqpacket_allow(u32 remote_cid)
-- 
2.33.0.721.g106298f7f9