[Info-vax] Assembly languages

[Simon Clubley]

On 2022-04-11, VAXman-  @SendSpamHere.ORG <VAXman- at SendSpamHere.ORG> wrote:
> In article <t318l3$92b$3 at dont-email.me>, Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> writes:
>>On 2022-04-10, Richard Maher <maher_rjSPAMLESS at hotmail.com> wrote:
>>>
>>>   Remember when inner-mode code and protected sub-systems were essential.
>>>
>>> Happy days.
>>
>>From a _security_ point of view, VMS has only ever had one inner mode,
>>just like other operating systems.
>>
>>Once you are in one of the hardware inner modes, you can get to the
>>others without any additional privileges required on the part of the
>>account doing it.
>
> If that were true, then Joe Noprivuser could go from user mode to kernel mode
> through a series of steps -- user->supervisor then supervisor->executive then
> executive->kernel.
>

Ok, Brian, you win. I'll be pedantic if you wish. :-)

Once you have code you control running in one of the hardware inner modes,
you can get to the others without any additional privileges required on
the part of the account doing it.

Happy now ? :-)

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
Walking destinations on a map are further away than they appear.