linux-kernel - Re: [PATCH net-next 2/3] vsock: fix vsock_dequeue/enqueue

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Message-ID: <20170817140541.GH5539@stefanha-x1.localdomain>
Date:   Thu, 17 Aug 2017 15:05:41 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        George Zhang <georgezhang@...are.com>,
        Jorgen Hansen <jhansen@...are.com>,
        Michal Kubecek <mkubecek@...e.cz>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Cathy Avery <cavery@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Rolf Neugebauer <rolf.neugebauer@...ker.com>,
        Dave Scott <dave.scott@...ker.com>,
        Marcelo Cerri <marcelo.cerri@...onical.com>,
        "apw@...onical.com" <apw@...onical.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "joe@...ches.com" <joe@...ches.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH net-next 2/3] vsock: fix vsock_dequeue/enqueue_accept race

On Tue, Aug 15, 2017 at 10:15:39PM +0000, Dexuan Cui wrote:
> With the current code, when vsock_dequeue_accept() is removing a sock
> from the list, nothing prevents vsock_enqueue_accept() from adding a new
> sock into the list concurrently. We should add a lock to protect the list.

The listener sock is locked, preventing concurrent modification.  I have
checked both the virtio and vmci transports.  Can you post an example
where the listener sock isn't locked?

Stefan

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