Enforcement Agent Kernel Integrity Protection
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Solution Overview
Problem
The increasing complexity of operating system kernels leads to a higher number of security vulnerabilities, particularly in monolithic kernel designs, where a compromise of any part can compromise the entire kernel, posing a significant risk due to their privileged position in the software stack.
Innovation Solution
A system with an enforcement agent that executes at a higher privilege level than the kernel code, monitoring and approving any changes to the kernel code to ensure its integrity, utilizing CPU-based protections and virtualization techniques to prevent unauthorized modifications and ensure only approved code executes with kernel privilege.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the kernel is designed as monolithic to maintain simplicity and performance, then system performance and stability are improved, but security vulnerability increases because a compromise of any part compromises the entire kernel
Solution Approach 1:
The patent segments the kernel into approved code regions and unauthorized code regions by establishing an enforcement agent that monitors and controls execution. The enforcement agent divides the kernel's execution space into trusted segments (approved code) and untrusted segments (unauthorized code), preventing execution of unauthorized code while maintaining the monolithic kernel's performance advantages.
Solution Approach 2:
The enforcement agent acts as an intermediary between the kernel code and the CPU execution unit. It sits at a higher privilege level and mediates all execution requests, approving or blocking code execution based on whether the code is in the approved code region. This intermediary layer enables security control without requiring fundamental changes to the monolithic kernel architecture.
2Reliability
If an enforcement agent is introduced to monitor and approve kernel code changes, then kernel code integrity is improved, but device complexity increases due to additional monitoring and control mechanisms
Solution Approach 1:
The enforcement agent performs multiple functions within a single component: it monitors code execution, approves or blocks execution requests, tracks execution state, and enforces security policies. By consolidating these functions into one agent operating at a higher privilege level, the patent avoids the complexity of multiple separate monitoring mechanisms while achieving comprehensive kernel integrity protection.
3Reliability
If the enforcement agent operates at a higher privilege level than the kernel, then security monitoring capability is improved, but ease of operation decreases due to additional privilege management requirements
Solution Approach 1:
The enforcement agent is initialized before the kernel executes any user-mode code. It pre-establishes the approved code region boundaries and execution monitoring mechanisms in advance. This preliminary setup allows the kernel to execute normally without requiring operators to manually manage privileges during operation, as the enforcement agent is already in place and configured to automatically monitor and approve execution requests.
Data Source
AI summary
Systems and methods are provided for preventing unauthorized modification of an operating system. The system includes an operating system comprised of kernel code for controlling access to operation of a processing unit. The system further includes an enforcement agent executing at a higher privilege than the kernel code such that any changes to the kernel code are approved by the enforcement agent prior to execution.