linux-kernel - Re: Fork Bombing Attack

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Message-ID: <4051.1179414105@turing-police.cc.vt.edu>
Date:	Thu, 17 May 2007 11:01:45 -0400
From:	Valdis.Kletnieks@...edu
To:	Anand Jahagirdar <anandjigar@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fork Bombing Attack

On Thu, 17 May 2007 20:15:32 +0530, Anand Jahagirdar said:
> Hello All
>               I have set per user process limit ( ulimit) for both
> root and guest account as 8000 by using option ulimit -u 8000.this is
> Hard limit.  still fork bombing attack killed the box and machine
> needed reboot. will any body please tell me why this is so? i have
> tried all this attack on machine with FC6 and Linux kernel 2.6.18.

Convince me that your machine in fact has sufficient resources to spawn 8000
processes.

Then retry it with "ulimit -u 100", and then do a binary search from 100 to 8000
to find out what value it stops working at.

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