Its a common misconception that a directory that to be empty to become a junction folder / symbolic link directory. Just make an alternative data stream on the directory a symbolic link and the entire directory transforms:pic.twitter.com/HzYvgtlo78
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Sweet :) Just to make sure I’m not missing something, this does require SeCreateSymbolicLink, right?
Junction folders with files inside rely on a design flaw in NTFS. When a file gets renamed this happes: Permission check, can we delete it from current dir. Permission check, can we create in destination dir. Yes: Then lock detination dir so its impossible to open with DELETE
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If its already opened with DELETE then abort rename move operation. Then the source file, gets "deattached" from source dir, and created in destination dir. But what about junction folders? They only require FILE_WRITE_ATTRIBUTES. So if the reparse point gets applied
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when the source file have lefts its source directory the move operation WILL happen regardless of the directory now being a junction folder :) By sending the rename through slow ntobj mgr lookups we get easily a multiply second window to race it.
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