Metadata Classification Hardware for Pre-Execution Memory Security
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Solution Overview
Problem
Existing security software fails to prevent malicious code execution by intermingling data and executable instructions in computer memory, allowing attackers to inject and execute malicious code, and existing security measures are reactive, failing to prevent attacks before they occur.
Innovation Solution
Implementing a system where metadata is used to enforce security policies by associating application data with metadata in separate or integrated memory, using tag processing hardware to check instructions for compliance with security policies before execution, and utilizing a policy processor to evaluate these policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data and executable instructions are intermingled in computer memory, then memory usage is efficient and simple, but security is compromised allowing malicious code injection
Solution Approach 1:
The patent segments memory into distinct regions: a first memory region for storing executable instructions and a second memory region for storing data. This segmentation prevents malicious code from being injected into data regions and executed, while maintaining efficient memory usage through proper separation of concerns.
Solution Approach 2:
The patent introduces metadata as an intermediary mechanism that associates security policies with memory regions. The tag processing hardware uses this metadata to enforce access control policies, acting as a mediator between the segmented memory regions and the execution environment to prevent unauthorized code execution.
2Difficulty of detecting and measuring
If security software monitors activities and looks for patterns, then detection capability is improved, but response time is delayed as damage has occurred by the time suspicious patterns emerge
Solution Approach 1:
The patent performs preliminary security checks by associating metadata with memory regions before code execution occurs. The tag processing hardware checks security policies in advance, preventing malicious code from executing rather than detecting it after damage has occurred. This proactive approach eliminates the time loss associated with reactive pattern monitoring.
3Reliability
If metadata is associated with application data in separate memory, then security policy enforcement is improved, but device complexity increases
Solution Approach 1:
The patent merges the metadata storage with the memory region structure itself. The tag processing hardware is integrated into the memory access path, combining the security enforcement function with the existing memory architecture rather than adding completely separate complex systems. This reduces overall device complexity while maintaining reliable security policy enforcement.
Data Source
AI summary
Systems and methods for metadata processing. In some embodiments, one or more metadata inputs may be processed to determine whether to allow an instruction. For instance, one or more classification bits may be identified from a metadata input of the one or more metadata inputs, and the metadata input may be processed based on the one or more classification bits.