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afl-kit

afl-cmin.py

Reimplement afl-cmin in python. Use less memory, less disk space, and faster.

Features/enhancement

  • Support the same command line flags as original afl-cmin.
  • dedup by hash of file content in the beginning.
  • -i DIR can be specified multiple times. Also support globbing.
  • -w WORKERS to specify number of workers.
  • --as_queue output filename like id:000001,hash:value.

So, you can use afl-cmin.py in workflow like this

  1. Run many instances of afl-fuzz and have multiple queues in sync_dir.1 directory
  2. afl-cmin.py -i 'sync_dir.1/*/queue' -o sync_dir.2/prev/queue --as_queue ...
  3. Run another batch of afl-fuzz in sync_dir.2. They will automatically sync queue from sync_dir.2/prev/queue.

Non-scientific performance test:

program worker temp disk (mb) memory time (min)
afl-cmin 1 9782 7.8gb 27
afl-pcmin 8 9762 7.8gb 13.8
afl-cmin.py 1 359 <50mb 11.9
afl-cmin.py 8 1136 <250mb 1.8

Detail of this table

  • the input are 79k unique files, total 472mb. the output are 5k files, total 39mb.
  • temp disk is the size of .traces folder after run with AFL_KEEP_TRACES=1.

License

Apache License 2.0. Copyright 2016 Google Inc.

This is not an official Google product.

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