linux-kernel - Re: Where is RLIMIT_RT

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Message-Id: <1152975857.6374.65.camel@idefix.homelinux.org>
Date:	Sun, 16 Jul 2006 01:04:17 +1000
From:	Jean-Marc Valin <Jean-Marc.Valin@...erbrooke.ca>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Lee Revell <rlrevell@...-job.com>,
	Esben Nielsen <nielsen.esben@...glemail.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: Where is RLIMIT_RT_CPU?

> as long as you can fork and exec as many of those processes as you want
> a per process rlimit is useless security wise... an evil user just fires
> off a second process just before the first one gets killed and a non-RT
> root still is starved out.

Of course, which is why the idea is for the limit to be global, across
all non-root users. AFAIK, that's what Ingo's original (pre-2.6.12)
patch did and also what Con Kolivas' SCHED_ISO patch does. That's also
why I think it would be very hard (if possible at all) to do this in
user space.

	Jean-Marc
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