From owner-freebsd-questions@FreeBSD.ORG  Mon Oct 22 18:09:05 2007
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 14D1216A468
	for <freebsd-questions@freebsd.org>;
	Mon, 22 Oct 2007 18:09:05 +0000 (UTC)
	(envelope-from jonc@chen.org.nz)
Received: from drone3.qsi.net.nz (drone3-svc-skyt.qsi.net.nz [202.89.128.3])
	by mx1.freebsd.org (Postfix) with ESMTP id 79CEE13C4C4
	for <freebsd-questions@freebsd.org>;
	Mon, 22 Oct 2007 18:09:04 +0000 (UTC)
	(envelope-from jonc@chen.org.nz)
Received: (qmail 30634 invoked by uid 0); 22 Oct 2007 18:08:51 -0000
Received: from unknown (HELO chen.org.nz) ([202.89.146.5])
	(envelope-sender <jonc@chen.org.nz>) by 0 (qmail-ldap-1.03) with SMTP
	for <freebsd-questions@freebsd.org>; 22 Oct 2007 18:08:51 -0000
Received: by chen.org.nz (Postfix, from userid 1000) id E885C7E863;
	Tue, 23 Oct 2007 07:08:50 +1300 (NZDT)
Date: Tue, 23 Oct 2007 07:08:50 +1300
From: Jonathan Chen <jonc@chen.org.nz>
To: Danielisz Laszlo <laszlo_danielisz@yahoo.com>
Message-ID: <20071022180850.GA14267@osiris.chen.org.nz>
References: <123275.56819.qm@web30812.mail.mud.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <123275.56819.qm@web30812.mail.mud.yahoo.com>
User-Agent: Mutt/1.4.2.3i
Cc: freebsd-questions@freebsd.org
Subject: Re: defend from -> :() { :&:; } ;:
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Oct 2007 18:09:05 -0000

On Sun, Oct 21, 2007 at 12:10:02PM -0700, Danielisz Laszlo wrote:
> Please do not try to execute this: :() { :&:; } ;: on your BSD machine.
> I ask all who already tried it how to defend from this?

That's just a fork bomb. Try looking at tuning(7) and login.conf(5) to
reduce the maxproc limit for users.
-- 
Jonathan Chen <jonc@chen.org.nz>
----------------------------------------------------------------------
"With sufficient thrust, pigs fly just fine. However, this is not necessarily
a good idea. It is hard to be sure where they are going to land, and it
could be dangerous sitting under them as they fly overhead." -- RFC 1925