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fuzz.py
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fuzz.py
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import random as rand
import subprocess
def gen_operand():
option = rand.randint(0, 2)
if option <= 1:
sig_bytes = int(round(rand.normalvariate(40, 50))) % 256
bytes = rand.choices(range(256), k=sig_bytes)
if option == 1:
bytes.extend([0] * (256 - sig_bytes))
if option == 2:
bytes = rand.choices(range(256), k=256)
n = 0
for byte in bytes:
n <<= 8
n |= byte
hex_n = "{:X}".format(n)
assert len(hex_n) <= 512
return n, hex_n
def gen_op():
return rand.choice([
(int.__add__, '+'),
(int.__sub__, '-'),
(int.__mul__, '*'),
(int.__mod__, '%'),
])
def run_command(cmd, input=None):
res = subprocess.run(cmd.split(' '), input=input, capture_output=True)
if res.returncode != 0:
print("Failed at", input)
print("Process error:")
for line in res.stderr.decode().split('\n'):
print(line)
exit(-1)
return res
res = run_command("cargo build --release --example calc")
for i in range(20000):
a, hex_a = gen_operand()
b, hex_b = gen_operand()
op, str_op = gen_op()
if b == 0 and str_op == '%':
continue
expected = op(a, b) % (1 << 2048)
input = "{} {} {}".format(hex_a, str_op, hex_b)
res = run_command("target/release/examples/calc", input=input.encode())
actual = bytes.decode(res.stdout).split("> ")
actual = "".join(actual).split('\n')
actual = "".join(actual)
if expected != int(actual, 16):
print("{} == {} but got 0x{}".format(input, hex(expected), actual))
assert False
if i % 200 == 0:
print(i, "/ 20000 OK")