sön 2020-05-31 klockan 10:04 -0500 skrev Jon Elson via cctalk: > On 05/31/2020 02:06 AM, jim stephens via cctalk wrote: > > > > On 5/30/2020 11:15 PM, Eric Smith via cctalk wrote: > > > On 05/29/2020 02:38 PM, Noel Chiappa via cctalk wrote: > > > > <snip> > > > > Low-level machines did not even have storage protection > > > > keys, and on the /40 and /50 (I think) it was an option, > > > > although I'd guess almost any /50 had it installed. > > Our /50 had it and I have never seen any indication in the > > documentation for the hardware that > > indicated that it was an option. > > > > I don't think that either MVT or MFT would have been very > > stable without it. I certainly spent a lot of time > > studying how to get around it, and am responsible for a > > couple of SPIE patches in the MVT product > > from exploits trying to get into supervisor mode to muck > > with such. > > > Yes, the SPIE call as supplied from IBM was surely the > security hole big enough for 5 ocean liners abreast to steam > right through! Everybody had to patch that, and the patch > was fairly simple. But, it was a clear indication of how > LITTLE IBM thought about security. Of course, they were > thinking about banks where 3 teams reviewed code before it > ever ran on the machine, not universities where kids would > try all sorts of mischief. > > Yes, I know supervisor state isn't tied to the storage > > keys, but that was the way I went to > > try to circumvent the storage keys. > Oh, once you have the P bit set to zero, you can do > anything, such as changing the storage protection key of > your own program. > > Jon
I have a school memory of something like that: my school had a PRIME 9955 with PRIMOS 19, well that system had a hole in the handling of serial lines with modems. One municipality employee was logged in from home/work and went home (basically pulled the plug on the pc and went home.) My friend dialed in and got into the employees login session.... I have a memory of the responsible system admin when he speaks with PRIME in Stockholm, well it wasn't the first time this happened...