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#!/usr/bin/env python3
# Copyright (c) 2019 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Run fuzz test targets.
"""
import argparse
import configparser
import os
import sys
import subprocess
import logging
# Fuzzers known to lack a seed corpus in https://github.com/bitcoin-core/qa-assets/tree/master/fuzz_seed_corpus
FUZZERS_MISSING_CORPORA = [
"addr_info_deserialize",
"asmap",
"base_encode_decode",
"block",
"block_file_info_deserialize",
"block_filter_deserialize",
"block_header_and_short_txids_deserialize",
"bloom_filter",
"decode_tx",
"fee_rate_deserialize",
"flat_file_pos_deserialize",
"float",
"hex",
"key_io",
"integer",
"key",
"key_origin_info_deserialize",
"locale",
"merkle_block_deserialize",
"out_point_deserialize",
"p2p_transport_deserializer",
"parse_hd_keypath",
"parse_numbers",
"parse_script",
"parse_univalue",
"partial_merkle_tree_deserialize",
"partially_signed_transaction_deserialize",
"prefilled_transaction_deserialize",
"psbt_input_deserialize",
"psbt_output_deserialize",
"pub_key_deserialize",
"rolling_bloom_filter",
"script_deserialize",
"strprintf",
"sub_net_deserialize",
"tx_in",
"tx_in_deserialize",
"tx_out",
]
def main():
parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument(
"-l",
"--loglevel",
dest="loglevel",
default="INFO",
help="log events at this level and higher to the console. Can be set to DEBUG, INFO, WARNING, ERROR or CRITICAL. Passing --loglevel DEBUG will output all logs to console.",
)
parser.add_argument(
'--export_coverage',
action='store_true',
help='If true, export coverage information to files in the seed corpus',
)
parser.add_argument(
'--valgrind',
action='store_true',
help='If true, run fuzzing binaries under the valgrind memory error detector',
)
parser.add_argument(
'-x',
'--exclude',
help="A comma-separated list of targets to exclude",
)
parser.add_argument(
'seed_dir',
help='The seed corpus to run on (must contain subfolders for each fuzz target).',
)
parser.add_argument(
'target',
nargs='*',
help='The target(s) to run. Default is to run all targets.',
)
args = parser.parse_args()
# Set up logging
logging.basicConfig(
format='%(message)s',
level=int(args.loglevel) if args.loglevel.isdigit() else args.loglevel.upper(),
)
# Read config generated by configure.
config = configparser.ConfigParser()
configfile = os.path.abspath(os.path.dirname(__file__)) + "/../config.ini"
config.read_file(open(configfile, encoding="utf8"))
if not config["components"].getboolean("ENABLE_FUZZ"):
logging.error("Must have fuzz targets built")
sys.exit(1)
# Build list of tests
test_list_all = parse_test_list(makefile=os.path.join(config["environment"]["SRCDIR"], 'src', 'Makefile.test.include'))
if not test_list_all:
logging.error("No fuzz targets found")
sys.exit(1)
logging.debug("{} fuzz target(s) found: {}".format(len(test_list_all), " ".join(sorted(test_list_all))))
args.target = args.target or test_list_all # By default run all
test_list_error = list(set(args.target).difference(set(test_list_all)))
if test_list_error:
logging.error("Unknown fuzz targets selected: {}".format(test_list_error))
test_list_selection = list(set(test_list_all).intersection(set(args.target)))
if not test_list_selection:
logging.error("No fuzz targets selected")
if args.exclude:
for excluded_target in args.exclude.split(","):
if excluded_target not in test_list_selection:
logging.error("Target \"{}\" not found in current target list.".format(excluded_target))
continue
test_list_selection.remove(excluded_target)
test_list_selection.sort()
logging.info("{} of {} detected fuzz target(s) selected: {}".format(len(test_list_selection), len(test_list_all), " ".join(test_list_selection)))
try:
help_output = subprocess.run(
args=[
os.path.join(config["environment"]["BUILDDIR"], 'src', 'test', 'fuzz', test_list_selection[0]),
'-help=1',
],
timeout=20,
check=True,
stderr=subprocess.PIPE,
universal_newlines=True,
).stderr
if "libFuzzer" not in help_output:
logging.error("Must be built with libFuzzer")
sys.exit(1)
except subprocess.TimeoutExpired:
logging.error("subprocess timed out: Currently only libFuzzer is supported")
sys.exit(1)
run_once(
corpus=args.seed_dir,
test_list=test_list_selection,
build_dir=config["environment"]["BUILDDIR"],
export_coverage=args.export_coverage,
use_valgrind=args.valgrind,
)
def run_once(*, corpus, test_list, build_dir, export_coverage, use_valgrind):
for t in test_list:
corpus_path = os.path.join(corpus, t)
if t in FUZZERS_MISSING_CORPORA:
os.makedirs(corpus_path, exist_ok=True)
args = [
os.path.join(build_dir, 'src', 'test', 'fuzz', t),
'-runs=1',
corpus_path,
]
if use_valgrind:
args = ['valgrind', '--quiet', '--error-exitcode=1'] + args
logging.debug('Run {} with args {}'.format(t, args))
result = subprocess.run(args, stderr=subprocess.PIPE, universal_newlines=True)
output = result.stderr
logging.debug('Output: {}'.format(output))
try:
result.check_returncode()
except subprocess.CalledProcessError as e:
if e.stdout:
logging.info(e.stdout)
if e.stderr:
logging.info(e.stderr)
logging.info("Target \"{}\" failed with exit code {}: {}".format(t, e.returncode, " ".join(args)))
sys.exit(1)
if not export_coverage:
continue
for l in output.splitlines():
if 'INITED' in l:
with open(os.path.join(corpus, t + '_coverage'), 'w', encoding='utf-8') as cov_file:
cov_file.write(l)
break
def parse_test_list(makefile):
with open(makefile, encoding='utf-8') as makefile_test:
test_list_all = []
read_targets = False
for line in makefile_test.readlines():
line = line.strip().replace('test/fuzz/', '').replace(' \\', '')
if read_targets:
if not line:
break
test_list_all.append(line)
continue
if line == 'FUZZ_TARGETS =':
read_targets = True
return test_list_all
if __name__ == '__main__':
main()
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