AFL Documentation Release 2.53b Michal Zalewski Jul 26, 2019 Contents 1 What is AFL? 1 1.1 AFL Quick Start Guide.........................................1 1.2 Motivation behind AFL.........................................2 1.3 Instrumenting programs for AFL....................................3 1.4 Fuzzing with afl-fuzz...........................................4 1.5 Installation instructions.........................................7 1.6 AFL User Guide............................................. 10 1.7 Using ASAN with AFL......................................... 22 1.8 Tips.................................................... 24 1.9 Limitations................................................ 29 1.10 More about AFL............................................. 30 1.11 Related projects............................................. 40 2 ChangeLog 47 2.1 Staying informed............................................. 47 2.2 Version 2.53b (2019-07-25):....................................... 47 2.3 Version 2.52b (2017-11-04):....................................... 47 2.4 Version 2.51b (2017-08-30):....................................... 48 2.5 Version 2.50b (2017-08-19):....................................... 48 2.6 Version 2.49b (2017-07-18):....................................... 48 2.7 Version 2.48b (2017-07-17):....................................... 48 2.8 Version 2.47b (2017-07-14):....................................... 48 2.9 Version 2.46b (2017-07-10):....................................... 48 2.10 Version 2.45b (2017-07-04):....................................... 49 2.11 Version 2.44b (2017-06-28):....................................... 49 2.12 Version 2.43b (2017-06-16):....................................... 49 2.13 Version 2.42b (2017-06-02):....................................... 49 2.14 Version 2.41b (2017-04-12):....................................... 49 2.15 Version 2.40b (2017-04-02):....................................... 49 2.16 Version 2.39b (2017-02-02):....................................... 49 2.17 Version 2.38b (2017-01-22):....................................... 50 2.18 Version 2.37b (2017-01-22):....................................... 50 2.19 Version 2.36b (2017-01-14):....................................... 50 2.20 Version 2.35b:.............................................. 50 2.21 Version 2.34b:.............................................. 50 2.22 Version 2.33b:.............................................. 51 i 2.23 Version 2.32b:.............................................. 51 2.24 Version 2.31b:.............................................. 51 2.25 Version 2.30b:.............................................. 51 2.26 Version 2.29b:.............................................. 51 2.27 Version 2.28b:.............................................. 51 2.28 Version 2.27b:.............................................. 52 2.29 Version 2.26b:.............................................. 52 2.30 Version 2.25b:.............................................. 52 2.31 Version 2.24b:.............................................. 52 2.32 Version 2.23b:.............................................. 52 2.33 Version 2.22b:.............................................. 52 2.34 Version 2.21b:.............................................. 52 2.35 Version 2.20b:.............................................. 53 2.36 Version 2.19b:.............................................. 53 2.37 Version 2.18b:.............................................. 53 2.38 Version 2.17b:.............................................. 53 2.39 Version 2.16b:.............................................. 53 2.40 Version 2.15b:.............................................. 53 2.41 Version 2.14b:.............................................. 53 2.42 Version 2.13b:.............................................. 54 2.43 Version 2.12b:.............................................. 54 2.44 Version 2.11b:.............................................. 54 2.45 Version 2.10b:.............................................. 54 2.46 Version 2.09b:.............................................. 54 2.47 Version 2.08b:.............................................. 54 2.48 Version 2.07b:.............................................. 54 2.49 Version 2.06b:.............................................. 55 2.50 Version 2.05b:.............................................. 55 2.51 Version 2.04b:.............................................. 55 2.52 Version 2.03b:.............................................. 55 2.53 Version 2.02b:.............................................. 55 2.54 Version 2.01b:.............................................. 55 2.55 Version 2.00b:.............................................. 56 2.56 Version 1.99b:.............................................. 56 2.57 Version 1.98b:.............................................. 56 2.58 Version 1.97b:.............................................. 56 2.59 Version 1.96b:.............................................. 56 2.60 Version 1.95b:.............................................. 56 2.61 Version 1.94b:.............................................. 57 2.62 Version 1.93b:.............................................. 57 2.63 Version 1.92b:.............................................. 57 2.64 Version 1.91b:.............................................. 57 2.65 Version 1.90b:.............................................. 57 2.66 Version 1.89b:.............................................. 57 2.67 Version 1.88b:.............................................. 57 2.68 Version 1.87b:.............................................. 58 2.69 Version 1.86b:.............................................. 58 2.70 Version 1.85b:.............................................. 58 2.71 Version 1.84b:.............................................. 58 2.72 Version 1.83b:.............................................. 58 2.73 Version 1.82b:.............................................. 58 2.74 Version 1.81b:.............................................. 59 2.75 Version 1.80b:.............................................. 59 2.76 Version 1.79b:.............................................. 59 ii 2.77 Version 1.78b:.............................................. 59 2.78 Version 1.77b:.............................................. 59 2.79 Version 1.76b:.............................................. 59 2.80 Version 1.75b:.............................................. 60 2.81 Version 1.74b:.............................................. 60 2.82 Version 1.73b:.............................................. 60 2.83 Version 1.72b:.............................................. 60 2.84 Version 1.71b:.............................................. 60 2.85 Version 1.70b:.............................................. 61 2.86 Version 1.69b:.............................................. 61 2.87 Version 1.68b:.............................................. 61 2.88 Version 1.67b:.............................................. 61 2.89 Version 1.66b:.............................................. 61 2.90 Version 1.65b:.............................................. 61 2.91 Version 1.64b:.............................................. 62 2.92 Version 1.63b:.............................................. 62 2.93 Version 1.62b:.............................................. 62 2.94 Version 1.61b:.............................................. 62 2.95 Version 1.60b:.............................................. 62 2.96 Version 1.59b:.............................................. 63 2.97 Version 1.58b:.............................................. 63 2.98 Version 1.57b:.............................................. 63 2.99 Version 1.56b:.............................................. 63 2.100 Version 1.55b:.............................................. 63 2.101 Version 1.54b:.............................................. 63 2.102 Version 1.53b:.............................................. 63 2.103 Version 1.52b:.............................................. 64 2.104 Version 1.51b:.............................................. 64 2.105 Version 1.50b:.............................................. 64 2.106 Version 1.49b:.............................................. 64 2.107 Version 1.48b:.............................................. 64 2.108 Version 1.47b:.............................................. 64 2.109 Version 1.46b:.............................................. 65 2.110 Version 1.45b:.............................................. 65 2.111 Version 1.44b:.............................................. 65 2.112 Version 1.41b:.............................................. 65 2.113 Version 1.40b:.............................................. 66 2.114 Version 1.39b:.............................................. 66 2.115 Version 1.38b:.............................................. 66 2.116 Version 1.37b:.............................................. 66 2.117 Version 1.36b:.............................................. 67 2.118 Version 1.35b:.............................................. 67 2.119 Version 1.34b:.............................................. 67 2.120 Version 1.33b:.............................................. 67 2.121 Version 1.32b:.............................................. 67 2.122 Version 1.31b:.............................................. 68 2.123 Version 1.30b:.............................................. 68 2.124 Version 1.29b:.............................................. 68 2.125 Version 1.28b:.............................................