linux-kernel - Re: [PATCH] netfilter: fix ordering of jumpstack allocation and table update

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Message-ID: <20131018165749.GI3296@mudshark.cambridge.arm.com>
Date:	Fri, 18 Oct 2013 17:57:50 +0100
From:	Will Deacon <will.deacon@....com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] netfilter: fix ordering of jumpstack allocation and
 table update

Hi Pablo,

On Fri, Oct 18, 2013 at 12:15:36PM +0100, Pablo Neira Ayuso wrote:
> On Thu, Oct 17, 2013 at 02:24:33PM +0100, Will Deacon wrote:
> > During kernel stability testing on an SMP ARMv7 system, Yalin Wang
> > reported the following panic from the netfilter code:

[...]

> > This patch adds an smp_wmb() before the assignment to table->private
> > (which is essentially publishing newinfo) to ensure that all writes to
> > newinfo will be observed before plugging it into the table structure.
> > A dependent-read barrier is also added on the consumer side, to ensure
> > the same ordering requirement are also respected there.
> 
> We also need fixes for net/ipv6/netfilter/ip6_tables.c and
> net/ipv4/netfilter/arp_tables.c as well. Could you extend this patch
> and resend?

Sure, I can try, but that's going to require a bit of time to sit down and
look at the shared data, access order, dependencies etc. I'm currently
preparing for Edinburgh, so it might be a while before I get a chance to
extend this.

Will
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