netdev - Re: [PATCH] netfilter: per netns nf_conntrack

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Message-ID: <4B6AC5DC.60301@trash.net>
Date:	Thu, 04 Feb 2010 14:04:28 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Alexey Dobriyan <adobriyan@...il.com>
CC:	Jon Masters <jonathan@...masters.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] netfilter: per netns nf_conntrack_cachep

Alexey Dobriyan wrote:
> On Thu, Feb 4, 2010 at 2:30 PM, Patrick McHardy <kaber@...sh.net> wrote:
>> Alexey Dobriyan wrote:
>>> On Thu, Feb 4, 2010 at 2:25 PM, Patrick McHardy <kaber@...sh.net> wrote:
>>>> Jon Masters wrote:
>>>>> On Wed, 2010-02-03 at 21:09 +0200, Alexey Dobriyan wrote:
>>>>>> On Wed, Feb 03, 2010 at 01:38:09PM -0500, Jon Masters wrote:
>>>>>>> *). Per namespace cacheing allocation (the cachep bits). We know it's
>>>>>>> still possible for weirdness to happen in the SLAB cache here.
>>>>>> Tiny race, needs reproducer.
>>>>> Maybe. I think it's worth fixing anyway.
>>>> Absolutely, I'll also apply Eric's patch with the %p fix for the
>>>> slab name.
>>> This would show kernel pointers in userspace ;-)
>>> So, net->id is required.
>> I don't see the problem. But yes, it would be nicer to have an ID.
> 
> This is done (or rather, not done) to not show attackers
> where data structures are.

That's news to me, my /proc is full of kernel space pointers,
including data.

In any case, we need a fix for this suitable for 2.6.33. If
you don't like using the pointer, please send a patch to add
an id to the network namespaces.
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