Continuation of trust for platform boot firmware
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United States of America Patent
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-
Dec 29, 2015
Grant Date -
Sep 4, 2014
app pub date -
Mar 1, 2013
filing date -
Mar 1, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
This disclosure is directed to continuation of trust for platform boot firmware. A device may comprise a processing module and a memory module including read-only memory (ROM) on which is stored platform boot firmware. On activation, the processing module may load the platform boot firmware. The platform boot firmware may cause the processing module to first load a trusted pre-verifier file to load and verify the signature of a hash table loaded from the platform boot firmware. The processing module may then load firmware program files from the platform boot firmware, calculate a hash for each file, and verify whether each program hash is in the hash table. Firmware program files with hashes in the hash table may be allowed to execute. If any firmware program file hash is not in the hash table, the processing module may perform platform specific security actions to prevent the device from being compromised.
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