I/O Filtering Layer for Guest OS Security
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Solution Overview
Problem
Existing filtering components within operating systems are vulnerable to the same vulnerabilities they aim to address and are limited by requiring specific operating system designs, with hypervisor integration posing challenges due to varying hypervisor types and extensibility.
Innovation Solution
A method involving the creation of an input/output filtering layer outside the guest operating system, which intercepts and filters communications between the guest operating system and hardware devices or hypervisor, allowing for flexible placement and operation independent of the guest operating system or hypervisor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filtering components are integrated into a hypervisor, then filtering capability is provided, but software vendors must design each filtering component for a specific type of hypervisor and some hypervisors are not extensible
Solution Approach 1:
The patent introduces a filtering component interface as an intermediary layer between the hypervisor and filtering components. This interface acts as a mediator that standardizes communication between diverse hypervisors and filtering components, allowing filtering components to work across different hypervisor types without requiring vendor-specific design for each hypervisor. The interface translates between hypervisor-specific mechanisms and a unified filtering API.
2Ease of operation
If filtering components execute within the same operating system they regulate, then they can directly filter I/O operations, but they become vulnerable to the same vulnerabilities and limited to specific operating systems
Solution Approach 1:
The patent extracts filtering components from the guest operating system and relocates them to run in the host operating system context, specifically within the virtualization management layer. This separation removes filtering components from the vulnerable guest OS environment while maintaining their ability to intercept and filter I/O operations through hypervisor hooks and device driver interfaces.
3Reliability
If filtering components are designed for specific operating systems, then they can effectively filter I/O operations, but they are limited to operating within that specific operating system
Solution Approach 1:
The patent creates a universal filtering component interface that enables filtering components to operate across multiple operating systems and hypervisor types. The interface defines standardized methods for intercepting I/O operations, filtering data, and managing filter states, allowing a single filtering component design to serve multiple platforms without requiring OS-specific implementations.
Data Source
AI summary
A computer-implemented method for filtering input/output communications of guest operating systems may include: 1) identifying a guest operating system running in a virtual machine, 2) creating an input/output filtering layer that resides outside the guest operating system, 3) intercepting, at the input/output filtering layer, an input/output communication involving the guest operating system, and then 4) performing a filtering operation on the input/output communication. Various other methods, systems, and computer-readable media are also disclosed.