PikeOS is an industrial operating system for safety and security critical applications in, for example, avionics and automotive contexts. A consortium of several European partners from industry and academia works on the certification of PikeOS up to at least Common Criteria EAL5+, with "+" being applying formal methods compliant up to EAL7. We have formalized the hardware independent security-relevant part of PikeOS that is to be used in a certification context. Over this model, intransitive noninterference has been proven. We present the model and the methodology used to create the model. All results have been formalized in the Isabelle/HOL theorem prover.
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