netdev - Re: [PATCH] ipv4: Use netinet->inet_opt in inet_csk_route_child

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Date:	Mon, 20 Aug 2012 14:11:08 +0200
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: Use netinet->inet_opt in inet_csk_route_child_sock()

On Monday 20 August 2012 02:51:47 David Miller wrote:
> From: Christoph Paasch <christoph.paasch@...ouvain.be>
> Date: Fri, 17 Aug 2012 23:35:12 +0200
> 
> > @@ -404,7 +404,7 @@ struct dst_entry *inet_csk_route_child_sock(struct
> > sock *sk,>
> >  {
> >       const struct inet_request_sock *ireq = inet_rsk(req);
> >       struct inet_sock *newinet = inet_sk(newsk);
> >
> > -     struct ip_options_rcu *opt = ireq->opt;
> > +     struct ip_options_rcu *opt = rcu_dereference(newinet->inet_opt);
> >
> >       struct net *net = sock_net(sk);
> 
> We're not inside of a rcu_read_lock() protected section, so this access
> is not legitimate.  If you enabled RCU lock debugging, you would have
> triggered a warning in the kernel log.

Oh, sorry... I will resubmit a v2.

Although, I enabled CONFIG_PROVE_RCU (and all other RCU-related debug I could 
find) and no warning was triggered.


By the way, in dccp_v4_request_recv_sock() is the code:
	newinet->inet_opt	= ireq->opt;

Shouldn't this rather be an rcu_assign_pointer() ?


And in cipso_v4_sock_delattr() I believe we should also rather access 'opt' 
instead of doing cipso_v4_delopt(&sk_inet->inet_opt) ?


Christoph

-- 
IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be
Université Catholique de Louvain
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