Freescale Semiconductor,inc.

Nxp Usa, Inc.

Alexander Stephan Schilling

Dirk Heisswolf

Andreas Ralph Pachl

A protection unit of an interrupt stack accessible by a CPU controlled by one software program, for storing and removing stack frame(s), the stack protection unit being coupleable to the stack and the CPU, comprising: A processor, a method and a computer program are also claimed.

Dynamic interrupt stack protection

A method for protecting a data item against unauthorized access and a data processing device is disclosed comprising a memory unit and a memory control unit to protect data items stored in the memory unit against prohibited access. Upon a write access the memory control unit forms a first data word comprising a data item and a first key; computes a first error-detection code; and stores the data item along with the first error-detection code. Upon a read access the memory control unit reads the data item and the first error-detection code; forms a second data word comprising the data item and a second key; computes a second error-detection code to the second data word; and determines a syndrome on the basis of the first error-detection code and the second error-detection code, wherein the syndrome is indicative of whether or not the first and second data words are identical.

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Berg, Germany

Alexander Stephan Schilling