Re: [PATCH] Reserve N process to root

[David Newall <david@davidnewall.com>]

Gustavo Chain wrote:
> El Wed, 10 Oct 2007 15:14:06 +0930
> David Newall <david@davidnewall.com> escribió:
>   
> > Gustavo Chain wrote:
> >     
> > > El Wed, 10 Oct 2007 11:19:27 +0930
> > > David Newall <david@davidnewall.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.
>   

This is like pulling teeth: painful.

I don't think you have satisfactorily explained why it's necessary.  "To 
prevent a possible DoS" isn't sufficient by itself.  I think you should 
explain the scenarios you have in mind.

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