Slightly related, there is a proof of concept FUSE based system that mutates files being read. [1] The purpose is when fuzzing with a simple bash harness, it is

Slightly related, there is a proof of concept FUSE based system that mutates files being read. [1] The purpose is when fuzzing with a simple bash harness, it is not high performance but has a fast set up time. 1. https://github.com/TACIXAT/FuzzyFileSystem https://github.com/TACIXAT/FuzzyFileSystem