ipc_fuzzer_mut.py 2.7 KB

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  1. # Copyright 2014 The Chromium Authors. All rights reserved.
  2. # Use of this source code is governed by a BSD-style license that can be
  3. # found in the LICENSE file.
  4. """Mutational ClusterFuzz fuzzer. A pre-built corpus of ipcdump files has
  5. to be uploaded to ClusterFuzz along with this script. As chrome is being
  6. developed, the corpus will become out-of-date and needs to be updated.
  7. This fuzzer will pick some ipcdumps from the corpus, concatenate them with
  8. ipc_message_util and mutate the result with ipc_fuzzer_mutate.
  9. """
  10. import os
  11. import random
  12. import subprocess
  13. import sys
  14. import utils
  15. FUZZER_NAME_OPTION = '--fuzzer-name=mutate'
  16. IPC_MESSAGE_UTIL_APPLICATION = 'ipc_message_util'
  17. IPCDUMP_MERGE_LIMIT = 50
  18. class MutationalFuzzer:
  19. def __init__(self):
  20. self.args = utils.parse_arguments()
  21. self.ipc_message_util_binary = utils.application_name_for_platform(
  22. IPC_MESSAGE_UTIL_APPLICATION)
  23. self.ipc_fuzzer_binary = utils.get_fuzzer_application_name()
  24. self.ipc_message_util_binary_path = utils.get_application_path(
  25. self.ipc_message_util_binary)
  26. self.ipc_fuzzer_binary_path = utils.get_application_path(
  27. self.ipc_fuzzer_binary)
  28. def set_corpus(self):
  29. # Corpus should be set per job as a fuzzer-specific environment variable.
  30. corpus = os.getenv('IPC_CORPUS_DIR', 'default')
  31. corpus_directory = os.path.join(self.args.input_dir, corpus)
  32. if not os.path.exists(corpus_directory):
  33. sys.exit('Corpus directory "%s" not found.' % corpus_directory)
  34. entries = os.listdir(corpus_directory)
  35. entries = [i for i in entries if i.endswith(utils.IPCDUMP_EXTENSION)]
  36. self.corpus = [os.path.join(corpus_directory, entry) for entry in entries]
  37. def create_mutated_ipcdump_testcase(self):
  38. ipcdumps = ','.join(random.sample(self.corpus, IPCDUMP_MERGE_LIMIT))
  39. tmp_ipcdump_testcase = utils.create_temp_file()
  40. mutated_ipcdump_testcase = (
  41. utils.random_ipcdump_testcase_path(self.args.output_dir))
  42. # Concatenate ipcdumps -> tmp_ipcdump.
  43. cmd = [
  44. self.ipc_message_util_binary_path,
  45. ipcdumps,
  46. tmp_ipcdump_testcase,
  47. ]
  48. if subprocess.call(cmd):
  49. sys.exit('%s failed.' % self.ipc_message_util_binary)
  50. # Mutate tmp_ipcdump -> mutated_ipcdump.
  51. cmd = [
  52. self.ipc_fuzzer_binary_path,
  53. FUZZER_NAME_OPTION,
  54. tmp_ipcdump_testcase,
  55. mutated_ipcdump_testcase,
  56. ]
  57. if subprocess.call(cmd):
  58. sys.exit('%s failed.' % self.ipc_fuzzer_binary)
  59. utils.create_flags_file(mutated_ipcdump_testcase)
  60. os.remove(tmp_ipcdump_testcase)
  61. def main(self):
  62. self.set_corpus()
  63. for _ in range(self.args.no_of_files):
  64. self.create_mutated_ipcdump_testcase()
  65. return 0
  66. if __name__ == '__main__':
  67. fuzzer = MutationalFuzzer()
  68. sys.exit(fuzzer.main())