Subject: Re: Is this kernel fault OK?
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: Lucio De Re <email@example.com>
Date: 06/27/2003 08:19:49
On Thu, Jun 26, 2003 at 05:19:33PM -0400, der Mouse wrote:
> > No, userland tools should never be able to crash the kernel (other
> > than root deliberately scribbling in kmem or something similar).
> I once tried to define what it is about things like
> dd if=/dev/zero of=/dev/mem
> that exempt them from the "userland should never be able to crash the
> kernel" dictum. I never really got anywhere. Any thoughts?
The superuser has the same level of authority as the kernel, maybe
a fraction more. Hence the superuser can crash the kernel. The
"dictum" merely does not apply to "root".
PS: WinNT has a "system" user and an "administrator" with different
privileges. Which means that one can create files that can't be
deleted by anyone, etc. A badly re-invented wheel.