Date: Tue, 15 Sep 1998 11:52:36 +0100 (BST) From: Jay Tribick <netadmin@fastnet.co.uk> To: security@FreeBSD.ORG Subject: grep ohdear /dev/zero in a tight loop freezes FreeBSD && OpenBSD Message-ID: <Pine.BSF.3.96.980915114336.342D-100000@bofh.fast.net.uk>
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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>
--
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