Memory Sector Immutability Control for Secure Boot Data
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Solution Overview
Problem
Existing non-volatile memory technologies lack the ability to define and enforce immutable regions, which are crucial for storing critical data such as cryptographic keys and firmware recovery codes, as these regions can be accidentally overwritten or erased during device initialization.
Innovation Solution
Implementing a memory device with a keystore region that stores configuration information specifying immutable sectors, where a controller and processing circuitry ensure that these sectors remain unwritable and unerasable during boot or initialization, using a bit cell system to define and enforce immutability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-volatile memory is made fully writable during initialization, then device flexibility and configurability are improved, but critical data such as cryptographic keys and firmware recovery codes may be accidentally overwritten or erased
Solution Approach 1:
The memory device is divided into multiple sectors, with each sector independently configurable as immutable or writable. This segmentation allows critical data to be stored in protected sectors while other sectors remain accessible for normal operations and initialization processes.
Solution Approach 2:
Different regions of the memory device have different accessibility properties. Specifically, certain sectors are designated as immutable with restricted write and erase permissions, while other sectors maintain full writability. This local differentiation enables simultaneous protection of critical data and flexibility for device configuration.
2Reliability
If immutable sectors are enforced to prevent data modification, then data security and integrity are improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The memory device includes on-chip circuitry that automatically enforces immutability constraints without requiring external controller intervention. The memory controller integrated within the device autonomously determines whether write or erase operations are permitted based on the immutable status of target sectors, reducing the complexity burden on external systems.
Solution Approach 2:
The immutability control functionality is merged directly into the memory device structure, combining storage and access control in a single integrated unit. This integration eliminates the need for separate external control mechanisms and simplifies the overall system architecture.
3Quantity of substance
If configuration information is stored in the same memory region as data, then memory utilization is improved, but the risk of accidental modification to critical data increases
Solution Approach 1:
The memory space is segmented into distinct functional regions including immutable sectors for critical data, configurable sectors for firmware and application data, and metadata sectors for configuration information. This segmentation physically separates configuration data from critical data, preventing accidental modification while maintaining efficient memory utilization.
Data Source
AI summary
Methods and devices enable configuration of a memory with respect to immutable data stored therein. An example device includes a first storage region having a plurality of sectors, each configurable to store data; and a second storage region configurable to store configuration information that specifies which sectors of the plurality of sectors stores data that is immutable during a boot or initialization process of the device. Each specified sector is controllable, based on the configuration data, to prevent data from being written to the sector and to prevent data stored in the sector from being erased.