RE: [MI400] RE: MI emulator

["Steve Richter" <srichter@xxxxxxxxxxxxx>]

-----Original Message-----
From: mi400-bounces@xxxxxxxxxxxx [mailto:mi400-bounces@xxxxxxxxxxxx]On
Behalf Of Leif Svalgaard
Sent: Saturday, October 11, 2003 9:55 AM
To: MI Programming on the AS400 / iSeries
Subject: Re: [MI400] RE: MI emulator


>...there may be other reasons for not
>opening up the system:  "security by obscurity". As I (for one) have
>repeatedly
>demonstrated, the system is insecure because the LQ/STQ instructions are
>not privileged instructions, i.e. can be executed by anybody. This makes
>it
>possible for anybody to manufacture a pointer to anywhere in all of the
>single-level store. Therefore, to maintain security, it must be nearly
>impossible
>for others than IBM to write compilers or construct program objects, and
>therefore one needs blocked instructions, etc, etc. This deficiency then
>ripples up through the whole system, leading to system states, extra
>activation groups (so that APIs can run), etc, etc., and none of this can
>be
>open because then the house of cards will come crashing down.


Are Windows and Linux also a security house of cards?  If so, why is it very
important that an open source os400 would be too?

-Steve