Docker Windows Patcher

A memory patch to work around Windows bug with Docker

Motivation

This project aims to work around the following blocking bug in Docker for Windows in process isolation mode, whenever image building is attempted:

Error response from daemon: hcsshim::PrepareLayer failed in Win32: Incorrect function. (0x1)

Explanation

This patcher injects its DLL into dockerd.exe. The DLL will then patch the loaded module vmcompute.dll, attempting to work around the Windows bug. Quote from source:

After debugging for a few hours I stumbled upon a call to AttachVirtualDisk which is used to mount the images. Some undocumented flags were passed to the function during one of the calls and I found out that removing the undocumented flags resolves the issue for some reason. I have created a simple program to patch the running dockerd daemon in memory and remove the undocumented flags.

More information on the problem, workaround and implementation can be found on the issue discussion

This project takes the above idea and improves upon it by providing a more robust, update-agnostic solution

Note

While the program works perfectly, it did not solve my problem but instead introduced error 0x57, which appears to be related to another Windows bug