Trustonic Limited

Lukas Hanel

Olivier Deprez

Alexandre Gonzalo

Baptiste Gourdin

Mehdi Oukacha

A trusted execution environment scheduling method for a device comprising a multicore processor, the processor operable to execute a rich execution environment (REE) and a trusted execution environment (TEE), the method comprising: providing a REE global scheduler in the REE, the REE global scheduler operable to schedule threads for execution in the REE; providing a TEE scheduler in the TEE, the TEE scheduler operable to schedule threads for execution in the TEE, wherein the TEE scheduler determines a number of runnable TEE threads which are either presently, or are awaiting, execution in the TEE and stores the number of runnable TEE threads in a location accessible to threads executing in the REE; providing a plurality of worker threads in the REE, the worker threads being in an activated state or in an deactivated state, wherein when an activated worker thread of the plurality of worker threads is executed according to the schedule of the REE global scheduler the worker thread makes a call to the TEE to cause execution of the TEE on the same core as the worker thread, and wherein the worker thread retrieves the number of runnable TEE threads and compares the retrieved number of runnable TEE threads to the number of currently activated worker threads.

Worker thread scheduling in trusted execution environment

A software decryption key is injected into a computing devicehaving a secure execution environmentand a less secure execution environment. The keyis for decryption of software to be run on the computing device. A key injection software componentexecuted within the secure execution environmentis used to control storage of the software decryption keyin a protected state in which the software decryption key is unreadable in the clear from the key storage location by an external device or by program code executed in the less secure execution environmentof the computing device. Software provided to the device is decrypted based on the injected software decryption key

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Cambridge, United Kingdom

Lukas Hanel