Mr. Twister

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In the filesystem track at the 2018 Linux Storage, Filesystem, and Memory-Management Summit (LSFMM), Al Viro discussed some problems he has recently spotted in the implementation of rmdir(). He covered some of the history of that implementation and how things got to where they are now. He also described areas that needed to be checked because the problem may be present in different places in multiple filesystems. The fundamental problem is a race condition where operations can end up being performed on directories that have already been removed, which can lead to some rather "unpleasant" outcomes, Viro said.
https://lwn.net/Articles/757122/
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