Defcon21 there was an hour long talk. (I'm not 100% sure it was 21, could have been 20). I look at MTS on a nearly a weekly basis. I want to say z/OS's mainfra

Defcon21 there was an hour long talk. (I'm not 100% sure it was 21, could have been 20). I look at MTS on a nearly a weekly basis. I want to say z/OS's mainframe OS is based on MTS. I don't know this for sure. This is how I arrived at this conclusion: (This is all ancient ~6-8 years Pre-Unix System 1) See the big draw of of the System360 was Michigan University shoe horned in memory visualization (which allowed for concurrent time shared processing). This was released as the System360-67M (M for Michigan), these things exploded off the shelves. IBM received roughly 100 orders for these systems, not requests to lease time, but cash in hand gimme that. They rolled out the System360-70 which was just the System360-67M, but under a different name. These are going to ship with TSS/360 (Time Sharing System 360). But ya know it never got done in time, and UofM had already finished MTS. Which did explode. Also OS/360 was batched based. You couldn't have multi-user, multi-process. Which famously modern System360 emulation can do. So who knows. I honestly don't know. But I'm 90% sure z/OS is just AIX with MTS in some kind of BSD-esque jail. I think MTS is open-ish sourced. It had a big community up until it was mothballed universally in the mid to late 90's. :.:.: I certainly can't afford a z/OS system to sit around and pentest myself :P :.:.: Also as I stated nobody configures the security of the underlying unix on IBM mainframes. So they maybe fairly easy to own.