Windows: How to intercept/hook FastIO filesystem calls?

  • 1 year ago
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To intercept or hook FastIO filesystem calls in Windows, you can use the Windows Driver Model (WDM) framework to create a file system filter driver. A file system filter driver sits between the file system and the underlying storage driver, allowing you to intercept and modify file system operations.

Here's a high-level overview of the steps involved:

  1. Set up the Windows development environment: Install the Windows Driver Kit (WDK) and set up the development environment for kernel-mode driver development.

  2. Create a new WDM driver project: Use the WDK tools to create a new WDM driver project in C/C++.

  3. Implement the driver entry point: Implement the driver's entry point function, which will be called when the driver is loaded.

  4. Register the file system filter: Use the FltRegisterFilter function to register the file system filter and specify the file system types you want to intercept.

  5. Implement the callback routines: Implement the callback routines for the FastIO operations you want to intercept. For example, you can implement the PreFastIoWrite callback routine to intercept write operations.

  6. Handle the intercepted operations: In your callback routines, you can examine or modify the parameters and behavior of the intercepted operations before they reach the underlying file system.

  7. Build and install the driver: Build the driver using the WDK build tools and install it on the target system. You'll need administrative privileges to install and test the driver.

It's important to note that creating and deploying a file system filter driver is an advanced topic that requires in-depth knowledge of Windows kernel-mode driver development and can have significant system-level impact. It's recommended to thoroughly understand the Windows Driver Model and consult the official Microsoft documentation and resources for detailed guidance.

Additionally, consider the potential impact and risks associated with developing and deploying kernel-mode drivers, as they can affect system stability and security. Carefully test and validate your driver before deploying it in a production environment.