Address Pinning for Sandbox Memory Isolation
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Solution Overview
Problem
Conventional sandbox environments face challenges in preventing untrusted software modules from accessing memory outside permitted ranges without incurring significant performance overhead or relying on complex validation methods.
Innovation Solution
Address pinning is employed by replacing specific bits of memory addresses with predefined bits, allowing the sandbox environment to control and restrict memory access, enabling it to run at a lower permission level than administrators while ensuring robust software fault isolation without excessive overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If address pinning is used to restrict memory access, then memory access control is improved, but device complexity increases
Solution Approach 1:
The patent introduces an address pinning unit as an intermediary component between the software module and the memory system. This unit intercepts memory address references from the software module and modifies them according to pinned address ranges, thereby providing memory access control without requiring the software module itself to be complex or aware of the restriction mechanisms.
Solution Approach 2:
The patent replaces complex software-based validation methods with a hardware-based address pinning mechanism. Instead of using sophisticated software validation that requires complex processing, the system uses hardware-level address translation and pinning units that automatically enforce memory access restrictions through hardware mechanisms, simplifying the overall system complexity.
2Reliability
If conventional validation methods are used in sandbox environments, then security is improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by establishing pinned address ranges and memory access rules before the software module executes. The address pinning unit is pre-configured with the permitted memory ranges, so that during execution, memory access control is performed automatically without requiring continuous validation processing, thereby reducing runtime overhead.
Solution Approach 2:
The address pinning unit operates autonomously to enforce memory access restrictions without requiring active intervention or validation from the sandbox environment software. The hardware mechanism self-manages the memory access control by automatically comparing addresses against pinned ranges, eliminating the need for complex software validation loops and reducing processing overhead.
3Reliability
If address pinning replaces memory address bits, then memory access restriction is improved, but ease of operation deteriorates
Solution Approach 1:
The address pinning unit serves as an intermediary that transparently handles the complexity of memory address manipulation. Software modules interact with memory through normal address references without needing to understand or manually manage the pinning mechanism. The intermediary automatically translates and adjusts addresses according to pinned ranges, maintaining ease of operation while ensuring memory access restriction.
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for memory address pinning. One of the methods includes loading a software module into a sandbox environment; receiving, a message from the software module to a recipient, the message includes a memory address; determining whether to pin the memory address; and passing the message to an address pinning unit which replaces at least a portion of the memory address with at least a portion of a specified replacement address, when it is determined to pin the memory address, and passes the modified message to be delivered to the recipient.