System and Method for Securing Embedded Controller Communications by Verifying Host System Management Mode Execution

摘要

An information handling system includes a processor operable to provide a branch trace message, and an embedded controller coupled to the processor via a primary interface and via a management interface. The embedded controller receives a management transaction from the processor via the primary interface. In response to receiving the management transaction, the embedded controller requests the branch trace message via the management interface and determines if the processor is operating in a system management mode based upon the branch trace message.

主权项

1. An information handling system, comprising:
a processor; and an embedded controller configured to:
receive a first management transaction from the processor, the first management transaction including a command to enable address decoding in the embedded controller; andissue a system management interrupt (SMI) to the processor in response to receiving the first management transaction; the processor being configured to:
determine whether the first management transaction was valid; andissue a second management transaction to the embedded controller, the second management transaction including an indication as to whether the first management transaction was valid.