Secure Kernel Launch in Multiprocessor Systems via Trusted Agent Validation
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Solution Overview
Problem
In computer systems with link-based topologies, ensuring a trusted environment for secure operations is challenging due to untrusted software configurations that can lead to memory aliasing and configuration errors, making it difficult to validate memory access correctly at the outset of system operation.
Innovation Solution
A secure kernel is launched across all processors using a trusted hardware chain, with a trusted software agent executed to validate the system configuration, and a spanning tree protocol is used to ensure all nodes are properly configured and communicate securely, allowing for the recording of a trusted environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a protocol is used to access memory with address decoding and routing mechanisms configured by software, then memory access flexibility is improved, but trustworthiness and reliability deteriorate due to untrusted software configuration
Solution Approach 1:
The system divides memory access into two distinct phases: a trusted setup phase where address decoding and routing are validated by a trusted agent, and an operational phase where the protocol executes. This segmentation allows flexible software configuration while ensuring reliability through separate validation, resolving the contradiction between adaptability and trustworthiness.
Solution Approach 2:
The trusted agent performs preliminary validation of address decoding and routing mechanisms before the protocol begins memory access operations. By pre-validating the configuration, the system ensures that subsequent memory accesses are trustworthy while maintaining the flexibility of software-configurable protocols.
2Device complexity
If hardware mechanisms and link controllers are trusted to behave as specified, then system simplicity is improved, but the ability to detect and measure configuration errors deteriorates
Solution Approach 1:
The trusted agent serves as an intermediary between the hardware mechanisms and the protocol. It validates hardware configurations and link controller behaviors without adding significant system complexity, while enabling detection of configuration errors that would otherwise be undetectable in a trusted hardware model.
Solution Approach 2:
The trusted agent provides feedback about the validity of hardware configurations and routing mechanisms. This feedback mechanism enables detection of configuration errors while maintaining relatively simple hardware that can be trusted to behave as specified, resolving the contradiction between simplicity and error detection capability.
3Reliability
If a trusted environment is established through validation of all hardware and software components, then security and reliability are improved, but system complexity and initialization time increase
Solution Approach 1:
The trusted agent is extracted as a separate, dedicated component responsible for validation, rather than distributing validation logic throughout the entire system. This extraction concentrates the complexity of trusted environment establishment in a single manageable entity, improving security while controlling overall system complexity.
Solution Approach 2:
The trusted agent performs multiple validation functions including verifying address decoding, validating routing mechanisms, and authenticating the protocol. By consolidating these diverse validation tasks into a single multi-functional component, the system achieves comprehensive security without proportionally increasing complexity.
4Adaptability or versatility
If address decoding and routing are configured by untrusted software, then system adaptability is improved, but the risk of configuration errors and memory aliases increases
Solution Approach 1:
The trusted agent performs preliminary validation of address decoding and routing configurations before the protocol uses them, preventing configuration errors and memory aliases from affecting system operation. This preliminary anti-action allows flexible software configuration while neutralizing the harmful effects of potential errors.
Data Source
AI summary
In one embodiment of the present invention, a method includes verifying an initiating logical processor of a system; validating a trusted agent with the initiating logical processor if the initiating logical processor is verified; and launching the trusted agent on a plurality of processors of the system if the trusted agent is validated. After execution of such a trusted agent, a secure kernel may then be launched, in certain embodiments. The system may be a multiprocessor server system having a partially or fully connected topology with arbitrary point-to-point interconnects, for example.