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# MOpt(imized) AFL by <puppet@zju.edu.cn>
### 1. Description
MOpt-AFL is a AFL-based fuzzer that utilizes a customized Particle Swarm
Optimization (PSO) algorithm to find the optimal selection probability
distribution of operators with respect to fuzzing effectiveness.
More details can be found in the technical report.
### 2. Cite Information
Chenyang Lyu, Shouling Ji, Chao Zhang, Yuwei Li, Wei-Han Lee, Yu Song and
Raheem Beyah, MOPT: Optimized Mutation Scheduling for Fuzzers,
USENIX Security 2019.
### 3. Seed Sets
We open source all the seed sets used in the paper
"MOPT: Optimized Mutation Scheduling for Fuzzers".
### 4. Experiment Results
The experiment results can be found in
https://drive.google.com/drive/folders/184GOzkZGls1H2NuLuUfSp9gfqp1E2-lL?usp=sharing.
We only open source the crash files since the space is limited.
### 5. Technical Report
MOpt_TechReport.pdf is the technical report of the paper
"MOPT: Optimized Mutation Scheduling for Fuzzers", which contains more deatails.
### 6. Parameter Introduction
Most important, you must add the parameter `-L` (e.g., `-L 0`) to launch the
MOpt scheme.
Option '-L' controls the time to move on to the pacemaker fuzzing mode.
'-L t': when MOpt-AFL finishes the mutation of one input, if it has not
discovered any new unique crash or path for more than t minutes, MOpt-AFL will
enter the pacemaker fuzzing mode.
Setting 0 will enter the pacemaker fuzzing mode at first, which is
recommended in a short time-scale evaluation.
Setting -1 will enable both pacemaker mode and normal aflmutation fuzzing in
parallel.
Other important parameters can be found in afl-fuzz.c, for instance,
'swarm_num': the number of the PSO swarms used in the fuzzing process.
'period_pilot': how many times MOpt-AFL will execute the target program
in the pilot fuzzing module, then it will enter the core fuzzing module.
'period_core': how many times MOpt-AFL will execute the target program in the
core fuzzing module, then it will enter the PSO updating module.
'limit_time_bound': control how many interesting test cases need to be found
before MOpt-AFL quits the pacemaker fuzzing mode and reuses the deterministic stage.
0 < 'limit_time_bound' < 1, MOpt-AFL-tmp.
'limit_time_bound' >= 1, MOpt-AFL-ever.
Have fun with MOpt in AFL!
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