Date: Tue, 15 Sep 1998 10:40:38 -0400 From: "Jason J. Horton" <jason@intercom.com> To: Jay Tribick <netadmin@fastnet.co.uk> Cc: security@FreeBSD.ORG Subject: Re: grep ohdear /dev/zero in a tight loop freezes FreeBSD && OpenBSD Message-ID: <35FE7C66.5E73C4B6@intercom.com> References: <Pine.BSF.3.96.980915114336.342D-100000@bofh.fast.net.uk>
next in thread | previous in thread | raw e-mail | index | archive | help
Don't allow users on your system. -J Jay Tribick wrote: > > Background > ---------- > FreeBSD bofh.fast.net.uk 2.2.6-RELEASE FreeBSD 2.2.6-RELEASE #0 > root@bofh.fast.net.uk:/usr/src/sys/compile/GENERIC i386 > > login.conf (ulimit) restrictions: > > lockd:\ > :priority=20:\ > :openfiles=32:\ > :openfiles-cur=32:\ > :memoryuse-cur=10M:\ > :maxproc-cur=32:\ > :cputime=1h:\ > :stacksize=2M:\ > :memorylocked=4M:\ > :memoryuse=10M:\ > :coredumpsize=0M:\ > :welcome=/etc/motd.lusers: > > 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? > 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?35FE7C66.5E73C4B6>