Date: Tue, 15 Sep 1998 15:41:57 +0100 (BST) From: Jay Tribick <netadmin@fastnet.co.uk> To: "Jason J. Horton" <jason@intercom.com> Cc: security@FreeBSD.ORG Subject: Re: grep ohdear /dev/zero in a tight loop freezes FreeBSD && OpenBSD Message-ID: <Pine.BSF.3.96.980915154027.947B-100000@bofh.fast.net.uk> In-Reply-To: <35FE7C66.5E73C4B6@intercom.com>
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| > Problem | > ------- | > Executing the following shell script effectively freezes a | > BSD box (tested on FreeBSD 2.2.6 & latest OpenBSD) regardless of the above | > process, cpu and memory restrictions within 15-30 seconds: | > | > #!/bin/bash | > while() do | > grep ohdear /dev/zero & | > done | > | > Any ideas on how to fix this or secure against it? | Don't allow users on your system. I don't, it's just something I noticed while I was trying to break my system :) Hehe.. The resource limits are fine for protecting against things like fork() rabbits etc. but for some reason the above overrides them. Regards, Jay Tribick <netadmin@fastnet.co.uk> -- [| Network Admin | FastNet International | http://fast.net.uk/ |] [| Finger netadmin@fastnet.co.uk for contact info & PGP PubKey |] [| +44 (0)1273 T: 677633 F: 621631 e: netadmin@fast.net.uk |] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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