Question: What could happen if a CPU does NOT have dual-mode or multimode operation? a user process has unlimited access to other users' process memory processes

What could happen if a CPU does NOT have dual-mode or

What could happen if a CPU does NOT have dual-mode or multimode operation? a user process has unlimited access to other users' process memory processes can access kernel data structures user processes can execute privileged instructions that can damage the hardware and access device controller registers arbitrarily cannot distinguish when executing kernel or user code

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