Secure CMB Bypass for Low Trust Data Transfers
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Solution Overview
Problem
Existing data processing technologies face challenges in secure data transfers in low trust environments, where resource sharing can lead to potential attacks from unauthorized entities, and existing techniques like NVMe and CXL may not adequately address security concerns.
Innovation Solution
The implementation of command memory buffer (CMB) transfer mechanisms that allow direct control and access by client devices for write and read operations, bypassing the device controller, and utilizing security actions such as authentication and encryption to ensure secure data transfers in a low trust environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If normal data transfer commands are used through the device controller, then data transfer can be performed with centralized control, but security vulnerabilities arise in low trust environments due to potential attacks on the controller
Solution Approach 1:
The patent segments the data path into two distinct paths: a normal data path through the device controller for常规 operations, and a bypass data path directly between client device and NVM for secure operations. This segmentation allows security-critical transfers to avoid the potentially compromised controller while maintaining controlled transfers for normal operations.
Solution Approach 2:
The Command Memory Buffer (CMB) acts as an intermediary structure that enables direct client device access to NVM while maintaining controlled transfer semantics. The CMB serves as a secure buffer zone where data can be transferred without passing through the device controller, thus eliminating the security vulnerability while preserving data integrity.
2Reliability
If direct client device access to NVM is implemented, then security is improved by bypassing the device controller, but data transfer control and management become more complex
Solution Approach 1:
The client device is empowered to directly manage its own data transfers to and from the NVM through the CMB, performing self-service operations without requiring device controller mediation. This self-service approach enhances security by eliminating the trusted controller requirement while the CMB provides the necessary management interface.
Solution Approach 2:
The CMB structure provides multi-functionality by serving as both a buffer for direct client device access and a controlled transfer interface. It handles both secure bypass operations and maintains compatibility with normal controlled transfer protocols, thus simplifying the overall system operation despite the added security layer.
3Reliability
If bypass data transfer commands are used for secure operations, then security is enhanced by avoiding the device controller, but the interface and command structure become more complex
Solution Approach 1:
The bypass data transfer mechanism is nested within the existing NVLink interface framework, with CMB commands integrated into the normal command structure. This nesting allows secure bypass operations to coexist with normal controlled transfers using a unified interface, reducing the apparent complexity despite the dual-path architecture.
Data Source
AI summary
Apparatus and method for executing controller memory buffer (CMB) based data transfer commands in a distributed data processing environment. In some embodiments, a storage device having a device controller and a main non-volatile memory (NVM) is coupled to a client device via an interface. The client device respectively issues normal data transfer commands and bypass data transfer commands to the storage device. The normal data transfer commands include read and write commands that result in transfer of data between the NVM and the client device using a normal data path through the storage device. The bypass data transfer commands involve an allocated CMB of the storage device directly controlled and accessed by the client device. In this way, write data are directly placed into the CMB for writing to the NVM, and readback data from the NVM are directly recovered from the CMB by the client device.