defend from -> :() { :&:; } ;:

Jonathan Chen jonc at
Mon Oct 22 11:09:05 PDT 2007

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 at>
"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

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