netdev - Re: [PATCH 07/10] vsock/loopback: implement copy

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Date:   Tue, 26 Oct 2021 13:18:35 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Marc-André Lureau <marcandre.lureau@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 07/10] vsock/loopback: implement copy_peercred()

On Thu, Oct 21, 2021 at 04:37:11PM +0400, Marc-André Lureau wrote:
>Signed-off-by: Marc-André Lureau <marcandre.lureau@...hat.com>
>---
> net/vmw_vsock/vsock_loopback.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
>diff --git a/net/vmw_vsock/vsock_loopback.c b/net/vmw_vsock/vsock_loopback.c
>index 169a8cf65b39..59317baa4e5c 100644
>--- a/net/vmw_vsock/vsock_loopback.c
>+++ b/net/vmw_vsock/vsock_loopback.c
>@@ -41,6 +41,12 @@ static int vsock_loopback_send_pkt(struct virtio_vsock_pkt *pkt)
>       return len;
> }
>
>+static void vsock_loopback_copy_peercred(struct sock *sk, struct virtio_vsock_pkt *pkt)
>+{
>+      /* on vsock loopback, set both peers by swaping the creds */
>+      sock_swap_peercred(sk, sk_vsock(pkt->vsk));
>+}
>+

It's a bit hacky set also the cred of `pkt->vsk`. I think here we should
only copy the cred of the remote peer.

Addind the call to t->copy_peercred() in the 
virtio_transport_recv_connecting() will set the other side.

Thanks,
Stefano