linux-kernel - Re: netlink: GPF in sock

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Message-ID: <20161130045207.GE26673@madcap2.tricolour.ca>
Date:   Tue, 29 Nov 2016 23:52:07 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes.berg@...el.com>,
        Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: netlink: GPF in sock_sndtimeo

On 2016-11-29 15:13, Cong Wang wrote:
> On Tue, Nov 29, 2016 at 8:48 AM, Richard Guy Briggs <rgb@...hat.com> wrote:
> > On 2016-11-26 17:11, Cong Wang wrote:
> >> It is racy on audit_sock, especially on the netns exit path.
> >
> > I think that is the only place it is racy.  The other places audit_sock
> > is set is when the socket failure has just triggered a reset.
> >
> > Is there a notifier callback for failed or reaped sockets?
> 
> Is NETLINK_URELEASE event what you are looking for?

Possibly, yes.  Thanks, I'll have a look.

- RGB

--
Richard Guy Briggs <rgb@...hat.com>
Kernel Security Engineering, Base Operating Systems, Red Hat
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