linux-kernel - Re: net/packet: use-after-free in packet_rcv

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Date:   Thu, 9 Feb 2017 20:18:43 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>,
        Anoob Soman <anoob.soman@...rix.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        David Miller <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>, jarno@....org,
        Philip Pettersson <philip.pettersson@...il.com>,
        weongyo.linux@...il.com, netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/packet: use-after-free in packet_rcv_fanout

On Thu, Feb 9, 2017 at 7:33 PM, Sowmini Varadhan
<sowmini.varadhan@...cle.com> wrote:
> On (02/09/17 19:19), Eric Dumazet wrote:
>>
>> More likely the bug is in fanout_add(), with a buggy sequence in error
>> case, and not correct locking.
>>
>> kfree(po->rollover);
>> po->rollover = NULL;
>>
>> Two cpus entering fanout_add() (using the same af_packet socket,
>> syzkaller courtesy...) might both see po->fanout being NULL.
>>
>> Then they grab the mutex.  Too late...
>
> I'm not sure I follow- aiui the panic was in acceessing the
> sk_receive_queue.lock in a socket that had been closed earlier. I think
> the assumption is that rcu_read_lock_bh in __dev_queue_xmit (and
> rcu_read_lock in dev_queue_xmit_nit?) should make sure that the nit
> packet delivery can be done safely, and the synchronize_net in
> packet_release() makes sure that the Tx paths are quiesced before freeing
> the socket.  What is the race-hole here? Does it have to do with the
> _bh and softirq context, somehow?
>

We have probably a dozen of bugs to fix in af_packet.c

The race in fanout_add() is one ot theml.

I do not believe Anoob Soman sent his fixes btw ...

( Look for this thread : http://marc.info/?l=linux-netdev&m=148588680525648&w=2