netdev - Re: [PATCH v2 1/3] vsock/virtio: use RCU to avoid use-after-free on the_virtio

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Message-ID: <20190704101701.GD1609@stefanha-x1.localdomain>
Date:   Thu, 4 Jul 2019 11:17:01 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] vsock/virtio: use RCU to avoid use-after-free on
 the_virtio_vsock

On Wed, Jul 03, 2019 at 12:41:35PM +0200, Stefano Garzarella wrote:
> On Wed, Jul 03, 2019 at 05:53:58PM +0800, Jason Wang wrote:
> > On 2019/6/28 下午8:36, Stefano Garzarella wrote:
> > Another more interesting question, I believe we will do singleton for
> > virtio_vsock structure. Then what's the point of using vdev->priv to access
> > the_virtio_vsock? It looks to me we can it brings extra troubles for doing
> > synchronization.
> 
> I thought about it when I tried to use RCU to stop the worker and I
> think make sense. Maybe can be another series after this will be merged.
> 
> @Stefan, what do you think about that?

Yes, let's make it a singleton and keep no other references to it.

Stefan

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