Process isolation is a set of different hardware and software technologies[1] designed to protect each process from other processes on the operating system. It does so by preventing process A from writing to process B.
Process isolation can be implemented with virtual address space, where process A's address space is different from process B's address space – preventing A from writing onto B.
Security is easier to enforce by disallowing inter-process memory access, in contrast with less secure architectures such as DOS in which any process can write to any memory in any other process.[2]
^Aiken, Mark; Fähndrich, Manuel; Hawblitzel, Chris; Hunt, Galen; Larus, James R. (October 2006). Deconstructing Process Isolation(PDF). ACM SIGPLAN Workshop on Memory Systems Performance and Correctness. doi:10.1145/1178597.1178599.
^All in one CISSP Exam Guide, 3rd Edition, Shon Harris
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