[Info-vax] How dangerous is it to be able to get into DCL supervisor mode ?

[VAXman- at SendSpamHere.ORG]

In article <ojegsn$kf$1 at dont-email.me>, Simon Clubley <clubley at remove_me.eisner.decus.org-Earth.UFP> writes:
>On 2017-07-03, VAXman-  @SendSpamHere.ORG <VAXman- at SendSpamHere.ORG> wrote:
>>
>> When in exec mode, one can invoke $CMKRNL and execute code in kernel
>> mode without possessing the privies needed for $CMKRNL because there
>> is a check for the previous mode being exec.  There's nothing similar
>> for $CMEXEC from supervisor mode.  It sure would have removed a few
>> hurdles for me when writing my DCL Debugger had that been the case.
>>
>
>Thanks Brian.
>
>There's still the bit about being able to set the privilege bits
>in supervisor mode however.
>
>However, if supervisor mode lets you do that, then that would seem to
>defeat the whole point of actually _having_ a supervisor mode. :-)

Because I'm already in supervisor mode with the debugger, I'll check on
this but I have some other issues that I need to focus on first.  Also,
it's US In-Dependence Day here.

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

I speak to machines with the voice of humanity.