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Commit2a2294f

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Improvefuzz_submodule.py coverage & efficacy
The fuzzer was having trouble analyzing `fuzz_submodule.py` when usingthe `atheris.instrument_imports()` context manager. Switching to`atheris.instrument_all()` instead slightly increases the startup timefor the fuzzer, but significantly improves the fuzzing engines abilityto identify new coverage.The changes here also disable warnings that are logged to `stdout` fromthe SUT. These warnings are expected to happen with some inputs andclutter the fuzzer output logs. They can be optionally re-enabled fordebugging by passing a flag o the Python interpreter command line orsetting the `PYTHONWARNINGS` environment variable.
1 parent6c00ce6 commit2a2294f

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2 files changed

+15
-5
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2 files changed

+15
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‎fuzzing/fuzz-targets/fuzz_submodule.py

Lines changed: 13 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -4,13 +4,22 @@
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importtempfile
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fromconfigparserimportParsingError
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fromutilsimportis_expected_exception_message,get_max_filename_length
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fromgitimportRepo,GitCommandError,InvalidGitRepositoryError
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8-
ifgetattr(sys,"frozen",False)andhasattr(sys,"_MEIPASS"):
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ifgetattr(sys,"frozen",False)andhasattr(sys,"_MEIPASS"):# pragma: no cover
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path_to_bundled_git_binary=os.path.abspath(os.path.join(os.path.dirname(__file__),"git"))
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os.environ["GIT_PYTHON_GIT_EXECUTABLE"]=path_to_bundled_git_binary
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withatheris.instrument_imports():
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fromgitimportRepo,GitCommandError,InvalidGitRepositoryError
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ifnotsys.warnoptions:# pragma: no cover
14+
# The warnings filter below can be overridden by passing the -W option
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# to the Python interpreter command line or setting the `PYTHONWARNINGS` environment variable.
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importwarnings
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importlogging
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# Fuzzing data causes some plugins to generate a large number of warnings
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# which are not usually interesting and make the test output hard to read, so we ignore them.
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warnings.simplefilter("ignore")
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logging.getLogger().setLevel(logging.ERROR)
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defTestOneInput(data):
@@ -92,6 +101,7 @@ def TestOneInput(data):
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defmain():
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atheris.instrument_all()
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atheris.Setup(sys.argv,TestOneInput)
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atheris.Fuzz()
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‎fuzzing/fuzz-targets/utils.py

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
importatheris# pragma: no cover
2-
importos
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importos# pragma: no cover
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fromtypingimportList# pragma: no cover
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55

@@ -24,7 +24,7 @@ def is_expected_exception_message(exception: Exception, error_message_list: List
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@atheris.instrument_func
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defget_max_filename_length(path:str)->int:
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defget_max_filename_length(path:str)->int:# pragma: no cover
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"""
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Get the maximum filename length for the filesystem containing the given path.
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