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afl-untracer
afl-untracer is an example skeleton file which can easily be used to fuzz a closed source library.
It requires less memory than qemu_mode however it is way more course grained and does not provide interesting features like compcov or cmplog.
Read and modify afl-untracer.c then make
and use it as the afl-fuzz target
(or even remote via afl-network-proxy).
This idea is based on UnTracer and modified by Trapfuzz. This implementation is slower because the traps are not patched out with each run, but on the other hand gives much better coverage information.