Wild guess: you could have a single address space shared by all "programs" while using virtual memory to restreint visibility on which page is accessible at a c

Wild guess: you could have a single address space shared by all "programs" while using virtual memory to restreint visibility on which page is accessible at a certain time. Like, at runtime, resort on a segfault to check some types of security tokens the caller would to check they are allowed to access the page and make the call. No idea how practical this would be.