Subject: Re: denial of service shell script
To: None <firstname.lastname@example.org>
From: David Laight <David.Laight@btinternet.com>
Date: 12/18/2001 11:08:36
> The following script used to crash NetBSD and OpenBSD a few years ago, I
> just tested it on -current, just to check that it was fixed, and it
> seems to turn into a nice denial of service script now. After it ran,
> process table is full, and it seems I'm bound to reboot to fix things.
> Is it a bad local setup at mine, or a real bug?
Or just one of the many ways root can shoot himself in the foot?
The is (probably) a limit on the number of processes a non-root
user can have (although clearly several could gang up on the system).
> set path = ( /usr/bin /usr/sbin /bin /sbin )
> cd /tmp
> if ( -e fifo ) then
> rm fifo
> mkfifo fifo
> while ( 1 )
> cat fifo >& /dev/null &
> Emmanuel Dreyfus