linux-kernel - RE: [PATCH v3] virtio_vsock: Fix race condition in virtio_transport_recv

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Date:   Sat, 30 May 2020 12:26:33 +0000
From:   Justin He <Justin.He@....com>
To:     Markus Elfring <Markus.Elfring@....de>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Kaly Xin <Kaly.Xin@....com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: RE: [PATCH v3] virtio_vsock: Fix race condition in
 virtio_transport_recv_pkt()

Hi Markus

> -----Original Message-----
> From: Markus Elfring <Markus.Elfring@....de>
> Sent: Saturday, May 30, 2020 6:41 PM
> To: Justin He <Justin.He@....com>; kvm@...r.kernel.org;
> netdev@...r.kernel.org; virtualization@...ts.linux-foundation.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org;
> stable@...r.kernel.org; David S. Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Kaly Xin <Kaly.Xin@....com>; Stefan Hajnoczi
> <stefanha@...hat.com>; Stefano Garzarella <sgarzare@...hat.com>
> Subject: Re: [PATCH v3] virtio_vsock: Fix race condition in
> virtio_transport_recv_pkt()
>
> > This fixes it by checking sk->sk_shutdown(suggested by Stefano) after
> > lock_sock since sk->sk_shutdown is set to SHUTDOWN_MASK under the
> > protection of lock_sock_nested.
>
> How do you think about a wording variant like the following?
>
>   Thus check the data structure member “sk_shutdown” (suggested by Stefano)
>   after a call of the function “lock_sock” since this field is set to
>   “SHUTDOWN_MASK” under the protection of “lock_sock_nested”.
>
Okay, will update the commit msg.

>
> Would you like to add the tag “Fixes” to the commit message?
Sure.

Thanks


--
Cheers,
Justin (Jia He)


>
> Regards,
> Markus
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