ICV Tripwires for Intra-Object Memory Overflow Detection
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Solution Overview
Problem
Existing memory safety mechanisms are limited in their ability to mitigate overflows between different fields within the same structure (intra-object overflows) and overflows between multiple entries in an array, as well as uninitialized use vulnerabilities in software.
Innovation Solution
The implementation of integrity check value (ICV) tripwires, which involve detecting ICV mismatches, determining if a memory region represents a tripwire, and suppressing or handling ICV mismatch exceptions during memory operations, such as copying, to ensure memory safety and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If integrity check value tripwires are implemented to detect ICV mismatches and mitigate memory safety vulnerabilities, then memory safety and security are improved, but device complexity increases due to additional detection and suppression mechanisms
Solution Approach 1:
The memory protection mechanism is segmented into multiple independent tripwires, each monitoring specific memory regions. Each tripwire independently detects ICV mismatches in its designated region, allowing fine-grained control over memory safety without requiring a monolithic complex system. The segmentation enables targeted protection of specific memory areas while maintaining overall system manageability.
Solution Approach 2:
The tripwire mechanism acts as an intermediary between memory operations and integrity verification. Instead of directly implementing complex verification logic in all memory operations, the tripwires serve as intermediate detectors that monitor ICV mismatches and trigger appropriate responses. This intermediary layer simplifies the overall system architecture by centralizing the detection function while allowing complex behaviors to be managed through standardized tripwire responses.
2Measurement precision
If granular control over memory integrity checks is provided through tripwires, then detection precision of memory violations is improved, but the number of components and control logic increases
Solution Approach 1:
The memory monitoring system is divided into multiple tripwires, each responsible for specific memory regions. This segmentation enables granular detection precision by allowing individual tripwires to monitor specific areas for ICV mismatches. The segmented approach provides fine-grained control over memory integrity checks while distributing the monitoring function across multiple simple, identical components rather than requiring complex centralized control.
Solution Approach 2:
The system controls detection precision by changing parameters such as tripwire placement, monitoring granularity, and suppression mode settings rather than increasing component complexity. By adjusting these parameters, the system can achieve precise detection of memory violations without proportionally increasing the number of tripwires or control logic, thus maintaining efficiency while improving measurement precision.
3Productivity
If ICV mismatch exceptions are suppressed during memory copy operations, then productivity is improved by allowing legitimate memory operations to complete, but false positive suppression may occur
Solution Approach 1:
The tripwire system incorporates feedback mechanisms that monitor memory operations and ICV mismatches in real-time. When an ICV mismatch is detected, the system provides feedback through suppression mode settings that allow legitimate memory operations to complete without triggering false positives. The feedback loop enables the system to distinguish between legitimate operations and actual violations, maintaining high productivity while minimizing false positive suppression through continuous monitoring and adaptive response.
Data Source
AI summary
Techniques for using integrity check value tripwires for memory safety are described. In an embodiment, an apparatus includes an instruction decoder to decode one or more instructions to copy a memory region; and execution circuitry coupled to the instruction decoder, the execution circuitry to perform one or more operations corresponding to the one or more instructions, including detecting an integrity check value (ICV) mismatch; determining whether a granule in the memory region represents a tripwire; determining a suppression mode associated with the one or more instructions; and in response to determining that the suppression mode allows copying the tripwire, copying the tripwire.