netdev - Re: oops / null deref in __inet6_check_established(), kernel 2.6.29-rc6

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Message-ID: <20090302050919.GJ28503@bombadil.infradead.org>
Date:	Mon, 2 Mar 2009 00:09:19 -0500
From:	Kyle McMartin <kyle@...radead.org>
To:	Kyle McMartin <kyle@...radead.org>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: oops / null deref in __inet6_check_established(), kernel
	2.6.29-rc6

On Fri, Feb 27, 2009 at 10:16:18PM -0500, Kyle McMartin wrote:
> This only seems to show up when CONFIG_NET_NS is enabled. (Reproduced on
> git HEAD with that option on, doesn't occur with the option off.)
> 
> I will confess complete ignorance to the network stack, but this patch
> fixes things... ipv4 seems to have the same namespace support, but
> increments the sock_net, not the twsk_net.
> 
> I'll probably put this patch into Fedora, if only to prevent this from
> being used as a local DoS by an unprivileged user.
> 
> Signed-off-by: Kyle McMartin <kyle@...hat.com>
> 

Any thoughts? This is a pretty serious issue... Granted we should
probably just turn CONFIG_NET_NS off entirely, since it's
underdocumented and should be explicitly labelled as experimental
instead of just depending on it...

regards, Kyle
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