The embedded systems design pay less attention to safety out of consideration for cost and power consumption

and the software defense mechanism unable to achieve the requirement of the embedded systems in real-time and reliability

as the most common software vulnerabilities

buffer overflow poses a serious threat to embedded systems in safety.So we build a hardware defense mechanism based on fine granularity instruction flow monitor to against buffer overflow attacks

through virtual implement the procedures by ours virtual execution units

we can detect attacks before it come comply.The result shows that the hardware defense mechanism can defense these attacks completely

and neither change the source code or destroy the pipeline integrity

nor affects performance

our protection mechanism could be used to prevent run-time buffer overflow attacks in other embedded systems.