linux-kernel - Re: Fork bombing Attack

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Message-ID: <20070517100703.01577558@the-village.bc.nu>
Date:	Thu, 17 May 2007 10:07:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Anand Jahagirdar" <anandjigar@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fork bombing Attack

On Thu, 17 May 2007 12:55:53 +0530
"Anand Jahagirdar" <anandjigar@...il.com> wrote:

> Dear Sir,
>              I just want to know whether fork bombing attack still
> exist on the machine having Distribution as Fedora Core 6 and Linux
> Kernel 2.6.x.?
> 
>            additional Info :  I have set ulimit as 8000 and loged in
> as Guest User on machine having Distribution as Fedora Core 6 and
> Linux kernel 2.6.18. simple fork bombing program while(1) fork();
> killed the box and machine needed reboot. will any body please tell me
> why fork bombing attack killed the box even after setting ulimit as
> 8000?

Did you set a sensible per user process limit and what swap/memory setup
do you have. If you have sensible per user process limits and zero
overcommit setup you shouldn't be able to do anything beyond soak up a
lot of CPU time.
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