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A protection boundary protects one software subsystem on a
computer from another, in such a way that only data that is
explicitly shared across such a boundary is accessible to
the entities on both sides. In general, all code within a
protection boundary will have access to all data within
that boundary.
The canonical example of a protection boundary on most
modern systems is that between processes and the kernel.
The kernel is protected from processes, so that they can
only examine or change its internal state in certain
strictly-defined ways.
Protection boundaries also exist between individual
processes on most modern systems. This prevents one buggy
or malicious process from wreaking havoc on others.
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