Firmware Module Execution Privilege Verification
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Solution Overview
Problem
In modern electronic and computing devices, there is a risk of untested test modules inadvertently being included in production firmware, which can affect device stability, reliability, compatibility, and security, as well as increase the attack vector, due to the complexity of firmware development and the difficulty in distinguishing between test and production modules at runtime.
Innovation Solution
A method is implemented to verify firmware module execution privilege by booting the firmware on a processor, identifying and verifying test modules with a production public key, halting the boot process and alerting the user if a test module attempts to execute in a production environment, using a signature verification process that differentiates between test and production modules through distinct private keys and metadata verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If firmware modules are developed and assembled with different privileges (test and production), then firmware functionality and flexibility are improved, but the risk of untested modules being included in production firmware increases
Solution Approach 1:
The patent applies local quality by assigning different execution privileges to different firmware modules based on their origin (test vs production). Each module is marked with a privilege level, and the system enforces these local quality differences through privilege checks during module execution, ensuring that only production modules run in production firmware while allowing test modules in development environments.
Solution Approach 2:
The patent implements preliminary action by marking firmware modules with execution privilege information during the firmware assembly process, before the firmware is deployed to production devices. This pre-marking allows the system to automatically distinguish between test and production modules at runtime without requiring complex verification during deployment.
2Adaptability or versatility
If firmware complexity increases with multiple modules, then functionality is improved, but the difficulty of detecting and measuring module execution privilege increases
Solution Approach 1:
The patent uses copying by creating a metadata copy of the execution privilege information for each firmware module. Instead of implementing complex verification logic in every module, the system stores privilege information in a centralized metadata structure that can be efficiently copied and verified, simplifying the detection and measurement of module privileges across the entire firmware.
3Ease of operation
If test modules are included in production firmware, then development flexibility is improved, but device security and stability are worsened
Solution Approach 1:
The patent applies preliminary anti-action by implementing a privilege verification mechanism that proactively prevents test modules from executing in production firmware. The system checks the execution privilege of each module before allowing it to run, and if a test module is detected in a production environment, the system halts execution and alerts the user, thereby preventing potential security issues before they can occur.
Data Source
AI summary
According to one example for verifying firmware module execution privilege, a firmware is booted on a processor. At least one firmware module in the firmware marked as a test module is identified, and verification with a production public key of metadata associated with the firmware is attempted. In an example, in the event that the metadata verifies successfully with the production public key, the firmware boot is halted when the processor determines that access to a video interface is available, and a user is alerted that a test module has attempted execution in a production firmware.