Message-ID: <20040406184803.51677.qmail@web40502.mail.yahoo.com>
Date: Tue, 6 Apr 2004 11:48:03 -0700 (PDT)
From: Sergiy Lozovsky <serge_lozovsky@yahoo.com>
Subject: Re: kernel stack challenge 
To: John Stoffel <stoffel@lucent.com>
Cc: Horst von Brand <vonbrand@inf.utfsm.cl>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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--- John Stoffel <stoffel@lucent.com> wrote:
> >>>>> "Sergiy" == Sergiy Lozovsky
> <serge_lozovsky@yahoo.com> writes:
> 
> >> Policy has no place inside the kernel.
> 
> Sergiy> Root privileges (ability to send a signal to
> any process,
> Sergiy> access any file and so on) are encoded in
> the kernel.
> 
> But that does not require a LISP interpreter in the
> kernel either.
> And you are also mistaking policy with a capability.
>  Who has root is
> a policy, what root can do is a capability.  They
> are seperate issues.

UID is stored in a task structure in the kernel as
well as what to do with it. With VXE both policy and
capability are in a file (out of the kernel), though
there is an option to preload it into the kernel
before execution of particular system starts.

> Sergiy> So all interaction with the kernel goes via
> VM.  Investing
> Sergiy> some time into carefull parameter check in
> VM allows to avoid
> Sergiy> the same work for each new application.
> 
> You have not given us a simple example of how this
> VM would be used in
> the kernel and what it provides.  I think that would
> help people
> understand why you think this is so needed.

I though I did. Here is a link to the site with
detailed description of the system. It works since
1999. - http://vxe.quercitron.com

It's not an example - it's working system.

There was an article in LinuxFocus - it's less
technical and more compact -
http://jamesthornton.com/linux/LinuxFocus/English/January2000/article133.shtml

Serge.

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