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

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Message-ID: <b6fcc0a1002040435t150aa7axf2dc0b139ed8f258@mail.gmail.com>
Date:	Thu, 4 Feb 2010 14:35:56 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
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

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.
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