Management Controller Authenticated Access to Host Mapped GPIO
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Solution Overview
Problem
Information handling systems face challenges in protecting host mapped resources from malicious or inadvertent operating system application code access, which can lead to instability, reliability issues, and potential electrical damage.
Innovation Solution
Implementing a selective management controller authenticated access control method that uses a cryptography engine to authenticate and lock/unlock host mapped GPIO and shared memory access, ensuring only authorized changes can be made during manufacturing, POST, and runtime operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If host mapped GPIO and shared memory are directly accessible by the host, then ease of operation is improved, but reliability deteriorates due to potential malicious or inadvertent access
Solution Approach 1:
The patent introduces a management controller as an intermediary between the host and host mapped resources (GPIO and shared memory). The management controller receives access requests from the host, authenticates them using a cryptography engine, and selectively grants or denies access. This mediator architecture allows direct host access for normal operations while blocking malicious or unauthorized access attempts, thus resolving the contradiction between ease of operation and system reliability.
2Reliability
If access control is implemented for host mapped resources, then reliability is improved, but device complexity increases due to additional authentication mechanisms
Solution Approach 1:
The management controller serves as a dedicated intermediary component that centralizes authentication logic. Rather than distributing complex authentication code across multiple system components, the management controller consolidates the cryptography engine and access control decisions in a single location. This approach improves reliability through consistent authentication while managing complexity by containing it within a specialized controller rather than spreading it throughout the system.
Solution Approach 2:
The management controller performs self-authentication using stored authentication credentials and the cryptography engine. Instead of requiring external authentication services or complex multi-component verification, the management controller autonomously validates access requests against its internal authentication data. This self-service capability reduces overall system complexity by eliminating dependency on external authentication infrastructure while maintaining strong security.
3Ease of manufacture
If default access permissions are set during manufacturing, then ease of manufacture is improved, but security deteriorates due to potential default vulnerabilities
Solution Approach 1:
The patent implements preliminary authentication configuration during manufacturing by pre-loading authentication credentials into the management controller's cryptography engine. Before the system is deployed, default access permissions are established with embedded authentication data that enables the management controller to validate future access requests. This preliminary setup allows easy manufacturing (pre-configured defaults) while preventing security vulnerabilities because the authentication mechanism is already in place to block unauthorized access before the system enters service.
Data Source
AI summary
An information handling system includes a host mapped general purpose input output (GPIO), a shared memory, a board management controller, and a cryptography engine. The host mapped GPIO includes a plurality of registers. The board management controller is in communication with the host mapped GPIO and with the shared memory, and is configured to control accessibility to the plurality of registers in the GPIO, and to control write accessibility of the shared memory based on a private key received from a basic input output system requesting accessibility to the plurality of registers and write accessibility of the shared memory. The cryptography engine is in communication with the board memory controller, and is configured to authenticate the private key received from the board management controller.