Safe Buffer Class for Multithreaded Memory Safety
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Solution Overview
Problem
Handle management in computer systems is prone to leaks, leading to performance issues, security vulnerabilities, and correctness problems due to improper release of handles, especially in multithreaded environments, where memory access can result in accessing freed memory, causing corruption and safety risks.
Innovation Solution
A safe buffer class is implemented with a wrapper around protected memory resources, using a reference counter to ensure that memory accesses are valid and within bounds, preventing access when the resource is freed and allowing access only when it is safe to do so, thus preventing handle leaks and memory corruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct pointers are used to access resources, then access speed is improved, but memory corruption and security vulnerabilities occur when resources are freed
Solution Approach 1:
The patent introduces an intermediary layer (the safe buffer wrapper) between the pointer and the actual memory resource. This wrapper monitors and controls access to the resource, preventing direct access that could lead to memory corruption when the resource is freed. The intermediary checks validity and manages the lifecycle of the resource safely.
Solution Approach 2:
The patent applies beforehand cushioning by using a reference counter that is incremented when a resource is allocated and decremented when accessed or freed. This counter mechanism prevents access to freed memory by ensuring that only valid resources can be accessed, cushioning against the harmful effect of memory corruption before it can occur.
2Reliability
If handles are released immediately, then memory leaks are prevented, but access to valid resources is blocked
Solution Approach 1:
The patent implements dynamics by making the handle state changeable between allocated and released states. The reference counter dynamically tracks the number of active references, allowing the system to adaptively manage resource access. When the counter is positive, resources are accessible; when zero, they are released and cannot be accessed, preventing leaks while maintaining operational ease during valid usage.
Solution Approach 2:
The patent uses feedback through the reference counter mechanism that continuously monitors the number of active references to a resource. This feedback loop allows the system to automatically manage handle states, preventing leaks by tracking usage patterns and releasing handles when appropriate, while ensuring resources remain accessible during active use.
3Productivity
If multiple threads access resources simultaneously, then system responsiveness is improved, but handle leaks and memory corruption increase
Solution Approach 1:
The patent applies universality by designing a safe buffer wrapper that serves multiple functions: it manages memory allocation, tracks reference counts, controls access validity, and prevents both handle leaks and memory corruption. This multi-functional approach allows multiple threads to safely access resources simultaneously without compromising reliability, as the wrapper handles all safety concerns uniformly.
Data Source
AI summary
A method and system for implementing a safe buffer is described herein. The method includes implementing a buffer class that ensures that accesses to memory are performed in a safe manner. The buffer class may be a handle to protected resources in memory. The buffer class may exploit methods to read and write to memory that ensures that read and writes are performed to valid memory locations within buffer bounds.