Re: DoS from local users (fwd)

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From
Chris Costello <chris@holly.dyndns.org>
Date
10 Apr 1999 00:08:14
Subject
Re: DoS from local users (fwd)
Message-ID
19990410020533.A8083@holly.dyndns.org


[ Hide this part ]
On Sat, Apr 10, 1999, Dmitry Valdov wrote:
> > You typically want to set a restriction as to how many
> > processes a user can spawn. This is done by editing
> > /etc/login.conf and changing the user's login class, see the man
> > page for 'login.conf'.
> >
>
> I'm about CPU usage, not about many processes.
> See:
> CPU states: 17.8% user, 0.0% nice, 81.7% system, 0.5% interrupt, 0.0%
> idle
> on any (tested on P2-45) machine.
>
> CPU is used by SYSTEM, not by USER. So I can't restrict it with login.conf
> And load average can be up to 20-40 :(
>
> Please don't redirect me to -questions, it's a kernel problem, not just
> config.

How is it a kernel problem? It's a forkbomb. It spawns many
processes. You can also limit CPU usage with login.conf, I
believe.

>
> Dmitry.
>
>
>
>
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>

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