Comparing this function to disassembled binaries from Windows XP, Birr argued that the BadStack function was simply copy-pasted from Windows XP, given that they were identical. The code that Birr disputed involved the function BadStack in syscall.S, as well as other unspecified items. > claim was made on 17 January 2006 by developer Hartmut Birr on the ReactOS developers mailing list (ros-dev) that ReactOS contained code derived from disassembling Microsoft Windows. But in regards to them, there’s a lot of wrong information floating around this thread. You’re right I should have been clear that they shut down and has themselves audited instead of risking a court battle but I don’t think the difference matters much, either way they were gonna have a code audit to disprove these allegations. Im definitely not taking shots at ReactOS here, I’m on their side and am fascinated with the project. It’s illegal to copy it but clean room implementations depend on disassembling code and documenting it allowing for another person to then do the implementation.

The reason I mention it is that this thread has been claiming it’s illegal to study and rewrite disassembled code but that isn’t the case. The fact is that an engineer claimed it had copied windows code and it had an assembly function believed to be taken directly from windows. ReactOS was audited, it doesn’t matter if they agreed to it.

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