Secure Access Interface for Untrusted Framework Isolation
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Solution Overview
Problem
Existing set top boxes face challenges in securely integrating untrusted software frameworks and applications with secure operating system environments, leading to potential security breaches and certification issues due to the risk of unauthorized access and system instability.
Innovation Solution
The integration of a secure software abstraction layer and virtualization techniques, such as container-based virtualization, are employed to isolate untrusted frameworks and applications from secure components, using a secure access interface and process isolation methods to prevent unauthorized access and ensure secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If untrusted software frameworks and applications are integrated into set top boxes, then functionality and platform independence are improved, but security compliance and certification are worsened due to potential unauthorized access and system instability
Solution Approach 1:
The system is divided into distinct security domains: a secure certified pathway for trusted operations and an untrusted framework pathway for untrusted applications. These pathways are separated by a boundary that prevents unauthorized interactions, allowing each to operate independently with appropriate security measures.
Solution Approach 2:
A secure access interface acts as an intermediary between the untrusted framework and the secure operating system environment. This interface controls and monitors all interactions, ensuring that untrusted applications cannot directly access or compromise secure components while still enabling necessary functionality.
2Reliability
If hardware boundaries are used to separate secure and untrusted processing modules, then security isolation is improved, but device complexity increases
Solution Approach 1:
The device is segmented into multiple processing modules with different security levels: a first processing module for secure functionality and a second processing module for untrusted framework support. This segmentation enables security isolation while maintaining modularity and manageability.
Solution Approach 2:
The secure access interface provides multi-functional capabilities by handling various types of interactions between untrusted and secure components through a unified mechanism, reducing the need for separate specialized interfaces for each type of interaction.
3Ease of operation
If process isolation techniques are used in multi-processor systems, then access control between applications is improved, but the possibility of security incursions from unsecure to secure zones increases when the operating system manages separation
Solution Approach 1:
The secure access interface serves as a trusted intermediary that manages all access control between untrusted applications and secure system resources. By centralizing access control through this interface rather than relying on operating system mechanisms alone, the system reduces security risks associated with OS-managed separation in multi-processor environments.
Data Source
AI summary
A set top box or like device incorporating an untrusted software framework as a client of a secure operating system kernel. The software framework may comprise, for example, an Android framework supported by an underlying Linux operating system environment having a secure kernel. The software framework can be executed using a variety of process isolation techniques depending on performance and isolation requirements. A secure access client/server interface may also be provided to support interactions between the untrusted software framework (and applications utilizing the untrusted software framework) and secure or trusted portions of the device. The secure access interface can be configured to perform operations such as handle validation, heap pointer validation, non-pointer parameter validation, heap isolation, and resource release relating to terminated processes. In further embodiments, a software framework aggregator is used to support a plurality of additional software frameworks for use in the set top box.