linux-kernel - Re: [PATCH] Reserve N process to root

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Message-ID: <20071010094622.7b8121cf@0xff.cl>
Date:	Wed, 10 Oct 2007 09:46:22 -0400
From:	Gustavo Chain <g@...f.cl>
To:	David Newall <david@...idnewall.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Reserve N process to root

El Wed, 10 Oct 2007 15:14:06 +0930
David Newall <david@...idnewall.com> escribió:

> Gustavo Chain wrote:
> > El Wed, 10 Oct 2007 11:19:27 +0930
> > David Newall <david@...idnewall.com> escribió:
> >   
> >> Gustavo Chain wrote:
> >>     
> >>> I think it's necessary to reserve some pids to the super user.
> >>> 5 must be sufficient.
> >>>       
> >> Why?  (Sorry if I missed something.)
> >>     
> >
> > ¿ To prevent a posible DoS ?
> >   
> 
> That was what I thought you had in mind; it protects from some kind
> of fork bomb, right?  But it doesn't seem useful unless you guarantee 
> having a process already running (with CAP_SYS_ADMIN) *before* the
> bomb goes off.

Not really, because fork bomb will never reach maximum pid possible.
And root will always have a "slot" to kill desired processes.

-- 
Gustavo Chaín Dumit
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