Fine-Grained Privilege Model for OS Zone Isolation
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Solution Overview
Problem
Existing computing systems face challenges in fully utilizing resources due to underutilization, particularly when multiple untrusting parties share a single hardware platform, leading to security and management issues that require complex resource allocation and isolation techniques.
Innovation Solution
Implementing a fine-grained privilege model in an operating system environment partitioned into a global zone and non-global zones, where each non-global zone has a specific set of allowable privileges, allowing processes to perform certain operations while restricting others, and using a single kernel instance for management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple applications are consolidated onto a single hardware platform, then resource utilization improves, but security and management complexity worsen
Solution Approach 1:
The patent divides the operating system into multiple zones (global zone and non-global zones) with distinct privilege levels. Each zone is segmented with specific privilege sets, allowing applications to run in isolated environments. This segmentation enables multiple applications to share hardware resources while maintaining security boundaries, resolving the contradiction between resource utilization and management complexity.
2Reliability
If logical partitioning is implemented to isolate applications, then security improves, but hardware support requirements and complexity worsen
Solution Approach 1:
The patent introduces a new dimension of privilege levels within the existing operating system architecture. Instead of relying solely on hardware virtualization, it creates software-based privilege domains (zones) that provide isolation. This dimensional approach to security allows strong isolation guarantees without requiring additional hardware privilege levels, resolving the contradiction between security and hardware complexity.
3Reliability
If multiple operating system instances are used to provide virtual machines, then isolation improves, but administration complexity and resource overhead worsen
Solution Approach 1:
The patent creates a universal zone structure where a single operating system kernel supports multiple zones with different privilege sets. Each zone can function as an isolated environment similar to a virtual machine, but all zones share the same kernel instance. This multi-functional approach provides VM-like isolation benefits while eliminating the overhead of multiple kernel instances and reducing administration complexity.
4Reliability
If fine-grained privileges are assigned to processes, then security control improves, but system complexity worsens
Solution Approach 1:
The patent assigns different privilege qualities to different zones rather than managing individual privileges for each process. Each zone receives a specific set of privileges appropriate to its function, and processes inherit privileges from their zone context. This local quality approach simplifies privilege management by grouping privileges at the zone level while maintaining fine-grained security control, resolving the contradiction between security and system complexity.
Data Source
AI summary
In one embodiment, the present invention provides techniques for managing activities of processes using a fine grained privilege model in an operating system environment partitioned into a global zone and one or more non-global zones for isolating processes from processes executing in association with other non-global zones under control of a single operating kernel instance.