Re: Dumping /dev/zero to the console

Webmaster (
Thu, 18 Jul 1996 15:22:58 +0000

On 18 Jul 96 at 1:19, Paul Gortmaker <>

> Here is a neat trick to make your linux box essentially unusable:
> On linux console, even as a non-priv user, do a:
> % dd if=/dev/zero bs=1024k
> Now switch to another console (or even X) and try to do anything useful
> and see how the box behaves. Same result with v1.2.13 and v2.0.7 kernel.
> Paul.

That's basically the same as the "grep whatever /dev/zero" discussed
on this list a while back.

Is there any reason /dev/zero should be readable by normal users, or
is it safe to chmod it so that nobody pulls this stunt? Just