Hardware Borrow Checker for Cryptographic Pointer Group Enforcement
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Solution Overview
Problem
Current software-based borrow checking in computing systems relies on assumptions that may not be valid in all environments, such as compiler correctness and absence of physical attacks, and lacks robust enforcement of memory safety and concurrency rules, leading to vulnerabilities like memory corruption and data races.
Innovation Solution
The implementation of cryptographic enforcement of borrow checking in computing hardware through new instructions and metadata management, which ensures that ownership IDs are updated and checked inline with memory allocations, providing resilience against violations of borrow checking rules, even in unsafe code and environments with compromised system layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software-based borrow checking is implemented, then memory safety and concurrency rules can be enforced, but the system becomes vulnerable to compiler errors, system software bugs, and physical attacks
Solution Approach 1:
The patent introduces hardware as an intermediary layer between software and memory. The hardware borrow checker circuitry independently verifies borrow checking rules without relying on compiler-generated instrumentation or system software, thereby eliminating vulnerabilities to compiler errors and system software bugs while maintaining memory safety enforcement
Solution Approach 2:
The patent replaces the software-based borrow checking mechanism with a hardware-based mechanism. By implementing borrow checking logic directly in hardware circuitry, the system achieves immunity to software-related attacks and errors, including compiler bugs, OS kernel vulnerabilities, and virtual machine manager errors
2Reliability
If hardware enforcement of borrow checking is implemented, then resilience against compiler and system software vulnerabilities is achieved, but device complexity increases
Solution Approach 1:
The patent designs the hardware borrow checker to perform multiple functions: it enforces borrow checking rules, tracks ownership IDs, validates pointer metadata, and prevents memory safety violations all within a single integrated hardware circuitry, thereby managing complexity through functional consolidation
Solution Approach 2:
The patent integrates the borrow checking hardware within the existing processor architecture, nesting the borrow checker circuitry within the memory management and control logic of the processor core, thereby minimizing additional complexity while achieving hardware enforcement
3Reliability
If strict borrow checking is enforced in hardware, then memory corruption and data races are prevented, but performance overhead increases due to metadata management
Solution Approach 1:
The patent performs borrow checking validations in hardware concurrently with normal memory operations, rather than as sequential software checks. The hardware circuitry continuously monitors pointer metadata and ownership IDs during memory access, eliminating performance overhead by parallelizing safety checks with computation
Solution Approach 2:
The hardware borrow checker automatically validates pointer metadata and ownership IDs without requiring software intervention or additional processing cycles. The circuitry self-manages the enforcement of borrow checking rules, eliminating the performance penalty associated with software-based validation
4Ease of manufacture
If compiler correctness is assumed for software-based borrow checking, then implementation simplicity is maintained, but security vulnerabilities arise from compromised compilers or system software
Solution Approach 1:
The hardware borrow checker serves as a trusted intermediary that independently validates borrow checking rules without trusting the compiler or system software. This eliminates security vulnerabilities by removing the trust assumption, as the hardware circuitry autonomously enforces memory safety regardless of compiler correctness or system software integrity
Data Source
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AI summary
Techniques for borrow checking in hardware are described. The technology includes a memory to store a plurality of allocated objects, an allocated object referenced by a pointer; and a processor to execute a join instruction to create a group of pointers, by creating a group record for the group referenced by a group pointer and setting a group bit and ownership identifier (ID) of pointers of the group; and execute a transfer group ownership instruction to transfer ownership of the group, including pointers of the group, by verifying validity of the group and setting the ownership ID of pointers of the group when the group is valid.