Security
The security benefits of microkernels have been frequently discussed. In the context of security the minimality principle of microkernels is a direct consequence of the principle of least privilege, according to which all code should have only the privileges needed to provide required functionality. Minimality requires that a system's trusted computing base (TCB) should be kept minimal. As the kernel (the code that executes in the privileged mode of the hardware) is always part of the TCB, minimizing it is natural in a security-driven design.
Consequently, microkernel designs have been used for systems designed for high-security applications, including KeyKOS, EROS and military systems. In fact common criteria (CC) at the highest assurance level (Evaluation Assurance Level (EAL) 7) has an explicit requirement that the target of evaluation be “simple”, an acknowledgment of the practical impossibility of establishing true trustworthiness for a complex system.
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