linux-kernel - Re: [RFC][PATCH 2/7] RSS controller core

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Date:	Fri, 16 Mar 2007 09:31:00 -0700
From:	Dave Hansen <hansendc@...ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org, menage@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>, xemul@...ru
Subject: Re: [RFC][PATCH 2/7] RSS controller core

On Thu, 2007-03-15 at 18:55 -0600, Eric W. Biederman wrote:
> To create a DOS attack.
> 
> - Allocate some memory you know your victim will want in the future,
>   (shared libraries and the like).
> - Wait until your victim is using the memory you allocated.
> - Terminate your memory resource group.
> - Victim is pushed over memory limits by your exiting.
> - Victim can no longer allocate memory
> - Victim dies
> 
> It's not quite that easy unless your victim calls mlockall(MCL_FUTURE),
> but the potential is clearly there.
> 
> Am I missing something?  Or is this fundamental to any first touch scenario?
> 
> I just know I have problems with first touch because it is darn hard to
> reason about.

I think it's fundamental to any case where two containers share the use
of the page, but either one _can_ be charged but does not receive a
_full_ charge for it.

I don't think it's uniquely associated with first-touch schemes.

The software zones approach where there would be a set of "shared" zones
would not have this problem, because any sharing would have to occur on
data on which neither one was being charged.

http://linux-mm.org/SoftwareZones

-- Dave

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