linux-kernel - Re: [PATCH 3.12 28/88] netfilter: x_tables: validate targets of jumps

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Message-ID: <20160725064122.GB15307@breakpoint.cc>
Date:	Mon, 25 Jul 2016 08:41:22 +0200
From:	Florian Westphal <fw@...len.de>
To:	Michal Kubecek <mkubecek@...e.cz>
Cc:	Jiri Slaby <jslaby@...e.cz>, Greg KH <greg@...ah.com>,
	Jiri Slaby <jirislaby@...il.com>, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org, Florian Westphal <fw@...len.de>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [PATCH 3.12 28/88] netfilter: x_tables: validate targets of jumps

Michal Kubecek <mkubecek@...e.cz> wrote:
> On Thu, Jul 21, 2016 at 09:00:33PM +0200, Jiri Slaby wrote:
> > On 07/21/2016, 08:56 PM, Greg KH wrote:
> > > On Thu, Jul 21, 2016 at 08:36:18AM +0200, Jiri Slaby wrote:
> > >> On 07/14/2016, 10:15 AM, Jiri Slaby wrote:
> > >>> From: Florian Westphal <fw@...len.de>
> > >>>
> > >>> 3.12-stable review patch.  If anyone has any objections, please let me know.
> > >>>
> > >>> ===============
> > >>>
> > >>> commit 36472341017529e2b12573093cc0f68719300997 upstream.
> > >>
> > >> I am now dropping this one. 3.12.62 will be released without that patch.
> > >> After the performance issue is resolved, it will be requeued.
> > > 
> > > Personally, I think the bug fixes were more important than the
> > > performance issues at this point in time, but it's your call to make :)
> > 
> > Ok, but to quote [1]:
> > iptables-restore will take forever (gave up after 10 minutes)
> > 
> > I would say it proved itself not to be a performance issue, but rather a
> > functional issue :). Both Pablo and Florian suggested to postpone the patch.
> 
> Even worse: because of a shared lock which is held for all this time,
> this allows (on kernel >= 3.8) an unprivileged user to block similar
> operation in all network namespaces including init_net.

What lock are you talking about?

The table lock is aquired after the sanity/translation pass.