Secure Debugging Access Control via Segmentation and Authentication
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Solution Overview
Problem
Modern microprocessors' complexity increases the complexity of debugging and profiling tools, but debug and test ports can be exploited by malicious users to bypass security measures, potentially accessing secure system portions.
Innovation Solution
Implementing a system with a processor and memory that uses security levels and authentication mechanisms to control access to secure debugging and profiling features, ensuring only authorized requests for secure testing are allowed, and using page attribute tables to manage memory access and export of debug information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If debug and test ports are implemented in microprocessors, then debugging and profiling capabilities are improved, but security measures can be bypassed by malicious users
Solution Approach 1:
The system segments access control by implementing multiple security levels (first security level and second security level) that divide the microprocessor's memory and operations into secure and non-secure portions. This segmentation allows debug ports to access non-secure portions while maintaining protection of secure portions through authentication mechanisms.
Solution Approach 2:
An authentication mechanism acts as an intermediary between debug ports and secure portions of the microprocessor. This intermediary verifies authentication credentials before allowing access, thereby mediating between the need for debugging capabilities and the need to prevent unauthorized access to secure areas.
2Reliability
If authentication mechanisms are implemented to control access, then security is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary authentication actions by checking authentication credentials before granting access to secure portions. This preliminary action prevents unauthorized access attempts from proceeding, thereby maintaining security while providing a clear decision point that simplifies the overall access control flow.
Solution Approach 2:
The authentication mechanism applies local quality by implementing security controls specifically at the boundary between secure and non-secure portions, rather than uniformly across the entire system. This allows complex authentication to be applied only where needed, reducing overall system complexity.
Data Source
AI summary
The present disclosure describes systems and methods for controlling access to secure debugging and profiling features of a computer system. Some illustrative embodiments include a system that includes a processor, and a memory coupled to the processor (the memory used to store information and an attribute associated with the stored information). At least one bit of the attribute determines a security level, selected from a plurality of security levels, of the stored information associated with the attribute. Asserting at least one other bit of the attribute enables exportation of the stored information from the computer system if the security level of the stored information is higher than at least one other security level of the plurality of security levels.