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full-disclosure-uk: Re: [Full-disclosure] Linux big bang theory.

Re: [Full-disclosure] Linux big bang theory....

From: Vincent Archer <varcher_at_nospam>
Date: Mon May 28 2007 - 09:08:51 GMT
To: Pavel Kankovsky <peak@argo.troja.mff.cuni.cz>


On Sun, 2007-05-27 at 14:22 +0200, Pavel Kankovsky wrote:
> "All memory" involves any aspect of the system mutable by the software. If
> the microcode is mutable than the memory used to store it is a part of
> "all memory".

Yes. And for typical systems, that also includes all of the mass storage (i.e. the file systems) attached to it: your software needs to require every single byte of data storage. I think such a system would come close to have a self-provable integrity, but such a system must be extremely carefully designed for it, and notably is non-expandable. Any expansion breaks down the proved state by introducing external unvalidated states, and you're back to square one.

Being able to validate the integrity of a system requires *at least* the entire potential system, which is why systems in general cannot self-prove: they require more than themselves. -- Vincent ARCHER varcher@denyall.com Tel : +33 (0)1 40 07 47 14 Fax : +33 (0)1 40 07 47 27 Deny All - 23, rue Notre Dame des Victoires - 75002 Paris - France _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/