def reproduce(self, target_path, input_path, arguments, max_time):
"""Reproduce a crash given an input.
Args:
target_path: Path to the target.
input_path: Path to the reproducer input.
arguments: Additional arguments needed for reproduction.
max_time: Maximum allowed time for the reproduction.
Returns:
A ReproduceResult.
"""
runner = libfuzzer.get_runner(target_path)
launcher.set_sanitizer_options(target_path)
# Remove fuzzing specific arguments. This is only really needed for legacy
# testcases, and can be removed in the distant future.
arguments = arguments[:]
launcher.remove_fuzzing_arguments(arguments)
runs_argument = constants.RUNS_FLAG + str(constants.RUNS_TO_REPRODUCE)
arguments.append(runs_argument)
result = runner.run_single_testcase(
input_path, timeout=max_time, additional_args=arguments)
return engine.ReproduceResult(result.command, result.return_code,
result.time_executed, result.output)
def fuzz(self, target_path, options, reproducers_dir, max_time):
"""Run a fuzz session.
Args:
target_path: Path to the target.
options: The FuzzOptions object returned by prepare().
reproducers_dir: The directory to put reproducers in when crashes
are found.
max_time: Maximum allowed time for the fuzzing to run.
Returns:
A Result object.
"""
profiler.start_if_needed('libfuzzer_fuzz')
runner = libfuzzer.get_runner(target_path)
launcher.set_sanitizer_options(target_path)
artifact_prefix = self._artifact_prefix(
os.path.abspath(reproducers_dir))
# Directory to place new units.
new_corpus_dir = self._create_temp_corpus_dir('new')
corpus_directories = [new_corpus_dir] + options.fuzz_corpus_dirs
fuzz_timeout = launcher.get_fuzz_timeout(options.is_mutations_run,
total_timeout=max_time)
fuzz_result = runner.fuzz(corpus_directories,
fuzz_timeout=fuzz_timeout,
additional_args=options.arguments +
[artifact_prefix],
extra_env=options.extra_env)
log_lines = fuzz_result.output.splitlines()
# Output can be large, so save some memory by removing reference to the
# original output which is no longer needed.
fuzz_result.output = None
# Check if we crashed, and get the crash testcase path.
crash_testcase_file_path = None
for line in log_lines:
match = re.match(launcher.CRASH_TESTCASE_REGEX, line)
if match:
crash_testcase_file_path = match.group(1)
break
# Parse stats information based on libFuzzer output.
parsed_stats = launcher.parse_log_stats(log_lines)
# Extend parsed stats by additional performance features.
parsed_stats.update(
stats.parse_performance_features(log_lines,
options.strategies,
options.arguments,
include_strategies=False))
# Set some initial stat overrides.
timeout_limit = fuzzer_utils.extract_argument(options.arguments,
constants.TIMEOUT_FLAG,
remove=False)
expected_duration = runner.get_max_total_time(fuzz_timeout)
actual_duration = int(fuzz_result.time_executed)
fuzzing_time_percent = 100 * actual_duration / float(expected_duration)
parsed_stats.update({
'timeout_limit': int(timeout_limit),
'expected_duration': expected_duration,
'actual_duration': actual_duration,
'fuzzing_time_percent': fuzzing_time_percent,
})
# Remove fuzzing arguments before merge and dictionary analysis step.
arguments = options.arguments[:]
launcher.remove_fuzzing_arguments(arguments)
self._merge_new_units(target_path, options.corpus_dir, new_corpus_dir,
options.fuzz_corpus_dirs, arguments,
parsed_stats)
# Add custom crash state based on fuzzer name (if needed).
project_qualified_fuzzer_name = (
data_types.fuzz_target_project_qualified_name(
utils.current_project(), os.path.basename(target_path)))
launcher.add_custom_crash_state_if_needed(
project_qualified_fuzzer_name, log_lines, parsed_stats)
fuzz_logs = '\n'.join(log_lines)
crashes = []
if crash_testcase_file_path:
# Write the new testcase.
# Copy crash testcase contents into the main testcase path.
crashes.append(
engine.Crash(crash_testcase_file_path, fuzz_logs, arguments,
actual_duration))
launcher.analyze_and_update_recommended_dictionary(
runner, project_qualified_fuzzer_name, log_lines,
options.corpus_dir, arguments)
return engine.Result(fuzz_logs, fuzz_result.command, crashes,
parsed_stats, fuzz_result.time_executed)
def fuzz(self, target_path, options, reproducers_dir, max_time):
"""Run a fuzz session.
Args:
target_path: Path to the target.
options: The FuzzOptions object returned by prepare().
reproducers_dir: The directory to put reproducers in when crashes
are found.
max_time: Maximum allowed time for the fuzzing to run.
Returns:
A FuzzResult object.
"""
profiler.start_if_needed('libfuzzer_fuzz')
runner = libfuzzer.get_runner(target_path)
launcher.set_sanitizer_options(target_path)
# Directory to place new units.
new_corpus_dir = self._create_temp_corpus_dir('new')
corpus_directories = [new_corpus_dir] + options.fuzz_corpus_dirs
fuzz_timeout = launcher.get_fuzz_timeout(options.is_mutations_run,
total_timeout=max_time)
fuzz_result = runner.fuzz(corpus_directories,
fuzz_timeout=fuzz_timeout,
additional_args=options.arguments,
artifact_prefix=reproducers_dir,
extra_env=options.extra_env)
if (not environment.get_value('USE_MINIJAIL') and
fuzz_result.return_code == constants.LIBFUZZER_ERROR_EXITCODE):
# Minijail returns 1 if the exit code is nonzero.
# Otherwise: we can assume that a return code of 1 means that libFuzzer
# itself ran into an error.
logs.log_error(ENGINE_ERROR_MESSAGE,
engine_output=fuzz_result.output)
log_lines = utils.decode_to_unicode(fuzz_result.output).splitlines()
# Output can be large, so save some memory by removing reference to the
# original output which is no longer needed.
fuzz_result.output = None
# Check if we crashed, and get the crash testcase path.
crash_testcase_file_path = runner.get_testcase_path(log_lines)
# Parse stats information based on libFuzzer output.
parsed_stats = launcher.parse_log_stats(log_lines)
# Extend parsed stats by additional performance features.
parsed_stats.update(
stats.parse_performance_features(log_lines,
options.strategies,
options.arguments,
include_strategies=False))
# Set some initial stat overrides.
timeout_limit = fuzzer_utils.extract_argument(options.arguments,
constants.TIMEOUT_FLAG,
remove=False)
expected_duration = runner.get_max_total_time(fuzz_timeout)
actual_duration = int(fuzz_result.time_executed)
fuzzing_time_percent = 100 * actual_duration / float(expected_duration)
parsed_stats.update({
'timeout_limit': int(timeout_limit),
'expected_duration': expected_duration,
'actual_duration': actual_duration,
'fuzzing_time_percent': fuzzing_time_percent,
})
# Remove fuzzing arguments before merge and dictionary analysis step.
arguments = options.arguments[:]
launcher.remove_fuzzing_arguments(arguments)
self._merge_new_units(target_path, options.corpus_dir, new_corpus_dir,
options.fuzz_corpus_dirs, arguments,
parsed_stats)
fuzz_logs = '\n'.join(log_lines)
crashes = []
if crash_testcase_file_path:
# Write the new testcase.
# Copy crash testcase contents into the main testcase path.
crashes.append(
engine.Crash(crash_testcase_file_path, fuzz_logs, arguments,
actual_duration))
project_qualified_fuzzer_name = (
data_types.fuzz_target_project_qualified_name(
utils.current_project(), os.path.basename(target_path)))
launcher.analyze_and_update_recommended_dictionary(
runner, project_qualified_fuzzer_name, log_lines,
options.corpus_dir, arguments)
return engine.FuzzResult(fuzz_logs, fuzz_result.command, crashes,
parsed_stats, fuzz_result.time_executed)