[Info-vax] Something is happening at VSI

[Simon Clubley]

On 2024-04-05, motk <meh at meh.meh> wrote:
> On 4/04/2024 10:43 pm, Simon Clubley wrote:
>>> Am 04.04.2024 um 09:52 schrieb motk:
>>>> On 4/3/24 10:20, motk wrote:
>>>> %SYSTEM-F-ACCVIO, access violation, reason mask=00, virtual
>>>> address=000000000000000C, PC=0000000000000002, PS=7AD5D8EE
>> 
>> Assuming the posted output has not been edited, running a user-mode program
>> resulted in the process being killed. That means it failed in either
>> supervisor mode or executive mode. That means VSI need to be told _privately_
>> about the sequence to reproduce (if it can be discovered) so that they can
>> see if the sequence can be modified to actually exploit the system.
>
> I can guarantee that output wasn't mangled in any way. I've been trying 
> to reproduce it with no success so far. It was an extremely surprising 
> result though; would it have hit a log somewhere?
>

The exit status on the accounting log may be interesting.

Try a "$ acc/since=<whatever>/full" and once you have found the correct
session, have a look at the exit status.

Assuming the current mode bits on x86-64 in the PS register match those
on Alpha, then, assuming I am decoding the bitfield correctly, it looks
like an executive mode failure (ie: a failure in RMS itself). :-(

Can someone confirm I am decoding the current mode bits in the above
PS register correctly ?

Simon.


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