[Delk]

You could do all of those things on an OS with proper security separation as long as you have full root access.

There's no megacorp stopping you from reading and writing kernel memory. Unless, of course, the computer refuses to run software not signed by the megacorp or some software refuses to run without a digitally signed chain all the way down to the firmware like some game anticheats do.

But that's not really because of things like permission boundaries for processes. You can have those and still be in full control of those boundaries. It may be more convoluted than in a barebones system like DOS, of course.

[hun3]

PatchGuard would like to have a word with you.