Flayer is a Valgrind tool which provides bit-precise dynamic taint analysis of input to a target application. In addition, it allows this flow to be altered irrespective of content through the modification of conditional jump (if clauses) and function call behavior. In addition, a small, Python wrapper library, LibFlayer, is included. It provides an easy interface for automation.
This is a proof of concept implementation, but it is fully functional. Please check it out!
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Also check out the blog entry by Will Drewry @ Google Security Team for more information about Flayer.
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