[Info-vax] Assembly languages

[Dave Froble]

On 4/12/2022 6:24 PM, Simon Clubley wrote:
> On 2022-04-12, Dave Froble <davef at tsoft-inc.com> wrote:
>> On 4/12/2022 1:34 PM, Simon Clubley wrote:
>>
>>> The key question is this: Can a non-privileged user who gets code they
>>> control running in supervisor mode come up with a way to switch to
>>> from supervisor mode to executive mode or kernel mode ?
>>
>> No, unless, there is some bug, and any bugs in any code pretty much calls off
>> any talk of security.
>>
>
> Actually, yes you can. If you don't want to mess around with trying to
> hook your supervisor mode code into DCL in a way that allows you do
> run it while a privileged image is active, you can simply activate a
> privileged image while in supervisor mode and then use the privileges
> of the image.

If you can interrupt a priv mode installed image and retain the privs, then that 
is a bug.

-- 
David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      E-Mail: davef at tsoft-inc.com
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