Information processing device, information processing method, and computer program product

An information processing method comprising:

• Switching, by a monitoring unit, mode between a non-secure mode and a secure mode;
• reading-writing, by a non-secure processing unit, that includes running in the non-secure mode, and reading communication data from and writing communication data in a shared memory;
• writing, by a secure processing unit, that includes running in the secure mode, and reading the communication data from the shared memory and writing the communication data in a storage;
• and
• managing, by a memory access control unit, access from the non-secure processing unit and the secure processing unit based on a memory access control table in which physical addresses in the shared memory are associated with state information either indicating a locked state for not allowing writing but allowing reading by the non-secure processing unit or indicating an unlocked state attained by cancelling the locked state.

A computer program product having a computer readable medium including programmed instructions, wherein the instructions, when executed by a computer, cause the computer to function as:

• a monitoring unit configured to switch mode between a non-secure mode and a secure mode;
• a non-secure processing unit configured to run in the non-secure mode, and read communication data from and write communication data in a shared memory;
• a secure processing unit configured to run in the secure mode, and read the communication data from the shared memory and write the communication data in a storage;
• and
• a memory access control unit configured to manage access from the non-secure processing unit and the secure processing unit based on a memory access control table in which physical addresses in the shared memory are associated with state information either indicating a locked state for not allowing writing but allowing reading by the non-secure processing unit or indicating an unlocked state attained by cancelling the locked state.