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mtfuzz_wrapper.py
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mtfuzz_wrapper.py
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import subprocess
import sys
import math
import shutil
import subprocess
import glob
import ipdb
import pickle
import os
import numpy as np
import struct
import time
FNULL = open(os.devnull, 'w')
mut_cnt = 0
'''
def train(x, y):
model = Sequential()
model.add(Dense(8, input_dim=x.shape[1]))
#model.add(Dense(32, input_dim=x.shape[1]))
model.add(Dense(1))
opt = keras.optimizers.adam(lr=0.01)
model.compile(loss='mse', optimizer=opt)
save_best = keras.callbacks.ModelCheckpoint("best_w.h5", monitor='loss', verbose=0, save_best_only=True, save_weights_only=True, mode='min', period=1)
model.fit(x, y, epochs=50, batch_size=int(x.shape[0]/32), verbose=0, callbacks=[save_best])
model.load_weights("best_w.h5")
layer_list = [(layer.name, layer) for layer in model.layers]
loss = layer_list[-1][1].output[:, 0]
grads = K.gradients(loss, model.input)[0]
iterate = K.function([model.input], [loss, grads])
loss_value, grads_value = iterate([x[0:1]])
idx = np.flip(np.argsort(np.absolute(grads_value), axis=1)[:, -x.shape[1]:].reshape((x.shape[1],)), 0)[:1000]
return idx
'''
check_out = subprocess.check_output
# find unexplored branches
def find_unexplored_br(unexplored_1,unexplored_2, explored, seeds,tmp_argvv, argvv):
global mut_cnt
strcmp_cnt = 0
tmp_argvv[6] = argvv[6] + '_br'
for seed_id,seed in enumerate(seeds):
out = ''
try:
# todo: add crach check for afl-showbr.
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash ")
shutil.copyfile(seed, "./crashes/id_0_0_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
continue
for line in out.splitlines():
tokens = line.split(b':')
if len(tokens) == 2:
edge = int(tokens[0])
hit = int(tokens[1])
if hit == 3:
if edge not in explored:
explored.append(edge)
if edge in unexplored_1:
del unexplored_1[edge]
if edge in unexplored_2:
del unexplored_2[edge]
elif hit == 1:
# if edge is explored before, skip it.
if edge in explored:
continue
# if edge is not in explored_1, add to unexplored_1/ append
if edge not in unexplored_1:
unexplored_1[edge] = [seed_id]
else:
unexplored_1[edge].append(seed_id)
# if edge is in explored_2, set it explored
if edge in unexplored_2:
del unexplored_2[edge]
del unexplored_1[edge]
explored.append(edge)
elif hit == 2:
# if edge is explored before, skip it.
if edge in explored:
continue
# if edge is not in explored_1, add to unexplored_1/ append
if edge not in unexplored_2:
unexplored_2[edge] = [seed_id]
else:
unexplored_2[edge].append(seed_id)
# if edge is in explored_2, set it explored
if edge in unexplored_1:
del unexplored_1[edge]
del unexplored_2[edge]
explored.append(edge)
if len(tokens) == 3:
edge = int(tokens[0])
hit = int(tokens[1])
lenn = int(tokens[2])
if hit == 3:
if edge not in explored:
explored.append(edge)
if edge in unexplored_1:
del unexplored_1[edge]
if edge in unexplored_2:
del unexplored_2[edge]
elif hit == 1:
# if edge is explored before, skip it.
if edge in explored:
continue
# if edge is not in explored_1, add to unexplored_1/ append
if edge not in unexplored_1:
unexplored_1[edge] = [(seed_id, lenn)]
else:
unexplored_1[edge].append((seed_id, lenn))
# if edge is in explored_2, set it explored
if edge in unexplored_2:
del unexplored_2[edge]
del unexplored_1[edge]
explored.append(edge)
elif hit == 2:
# if edge is explored before, skip it.
if edge in explored:
continue
# if edge is not in explored_1, add to unexplored_1/ append
if edge not in unexplored_2:
unexplored_2[edge] = [(seed_id, lenn)]
else:
unexplored_2[edge].append((seed_id, lenn))
# if edge is in explored_2, set it explored
if edge in unexplored_1:
del unexplored_1[edge]
del unexplored_2[edge]
explored.append(edge)
print(seed_id, len(unexplored_1) + len(unexplored_2), len(explored))
# set the seed with proper size at the head of list
for k,v in unexplored_1.items():
if not isinstance(v[0], tuple):
tmp_len = os.stat(seeds[v[0]]).st_size
for ele in v:
f_name = seeds[ele]
f_len = os.stat(f_name).st_size
if f_len > tmp_len:
v[0] = ele
else:
tmp_len = os.stat(seeds[v[0][0]]).st_size
for ele in v:
f_name = seeds[ele[0]]
f_len = os.stat(f_name).st_size
if f_len > tmp_len:
v[0] = ele
# for each unexplored CMP-based branch, mutate hot bytes with intecepted operands
# (TODO: clean this function, many duplicated code logic)
def crack(tmp_argvv, argvv):
magic_dict = {}
#possible_val = [1,3,7,15,31,63,127,255]
#possible_val = [3,12,48,192]
possible_val = [15, 240]
if os.path.isdir("./tmp_train/") == False:
os.makedirs('./tmp_train')
if os.path.isdir("./tmp_non_direct/") == False:
os.makedirs('./tmp_non_direct')
if os.path.exists('./br_log'):
magic_dict = pickle.load(open("br_log", 'rb'))
else:
br_log_name = argvv[6] + '_br_log'
with open(br_log_name, 'r') as f:
lines = f.read().splitlines()
for line in lines:
tokens = line.split(' ')
br_id = int(tokens[2])
br_type = int(tokens[4])
constant_loc = int(tokens[6])
constant_val = tokens[8]
lenn = int(tokens[10])
if br_id not in magic_dict:
magic_dict[br_id] = (br_type, constant_loc, constant_val, lenn)
pickle.dump(magic_dict, open('br_log', 'wb'))
# read mut_cnt counter
global mut_cnt
with open("mut_cnt", 'r') as f:
mut_cnt = int(f.read())
# obtain unexplored branches
unexplored_1 = {}
unexplored_2 = {}
explored = []
seeds = glob.glob("seeds/*")
seeds.sort()
find_unexplored_br(unexplored_1, unexplored_2, explored, seeds,tmp_argvv, argvv)
if os.path.exists("crack_failed"):
crack_failed_but_I_tried = pickle.load(open("crack_failed","rb"))
else:
crack_failed_but_I_tried = []
# concatenate two dicts
unexplored_1.update(unexplored_2)
unexplored = unexplored_1
del unexplored[0]
#pickle.dump(unexplored, open('tmp_unexplored','wb'))
#unexplored = pickle.load(open('tmp_unexplored','rb'))
# k==br_id, v==seed_id
for k,v in unexplored.items():
if k in crack_failed_but_I_tried:
continue
crack_bool = False
# parse branch information from magic_dict (from static analysis LLVM)
(br_type, constant_loc, constant_magic, lenn) = magic_dict[k]
#if br_type != 2 and br_type != 7 and br_type != 11:
#if br_type != 10 and br_type != 12:# and br_type != 11:
# continue
if br_type == 0 or br_type == 1:
seed_id = v[0]
init_seed = bytearray(open(seeds[seed_id],'rb').read())
print("br id: " + str(k) + " br len: " + str(lenn) + " br type: " + str(br_type) + " magic: " + constant_magic + " magic_loc: " + str(constant_loc) + " file len: " + str(len(init_seed)))
# clean tmp dir
for f in glob.glob("./tmp_train/*"):
os.remove(f)
# create baseline file
with open("./tmp_train/"+str("121212"),'wb') as f:
f.write(init_seed)
# generate sample inputs
for i in range(len(init_seed)):
tmp_seed = init_seed.copy()
for val in possible_val:
tmp_seed[i] = val
with open("./tmp_train/"+str(i)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# parse variable values for each sample inputs
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_train', '-o', './tmp_train', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8", errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
if '121212' not in tmp_dict:
continue
init_op1 = tmp_dict['121212'][0]
init_op2 = tmp_dict['121212'][1]
init_distance = tmp_dict['121212'][0] - tmp_dict['121212'][1]
hot_offsets = []
min_dist = float('inf')
file_name = ''
# no magic constant case
if constant_loc == 0:
# parse hot bytes
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if ops[0] != init_op1 or ops[1] != init_op2:
# choose the optimal seed as starting point
if abs(distance) < min_dist:
min_dist = abs(distance)
file_name = offset
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance > 0 and init_distance <= 0) or (distance <= 0 and init_distance > 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
# generate possible candidtate inputs to crack the branch
init_seed = bytearray(open('./tmp_train/'+file_name,'rb').read())
for f in glob.glob("./tmp_non_direct/*"):
os.remove(f)
for hot_offset in hot_offsets[:64]:
tmp_seed = init_seed.copy()
for val in range(255):
tmp_seed[hot_offset] = val
with open("./tmp_non_direct/"+str(hot_offset)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# check results using faster mode binary
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_non_direct', '-o', './tmp_non_direct', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8",errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if (distance > 0 and init_distance <= 0) or (distance <= 0 and init_distance > 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_non_direct/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# magic constant case
else:
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if distance != init_distance:
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance > 0 and init_distance <= 0) or (distance <= 0 and init_distance > 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
if init_distance > 0:
# construct an equal case to satisfy <= case
magic_ori = struct.pack("@Q", int(constant_magic))
else:
# construct an > case to safisfy > case
if constant_loc == 2:
magic_ori = struct.pack("@Q", int(constant_magic)+1)
elif constant_loc == 1:
if int(constant_magic) == 0:
continue
magic_ori = struct.pack("@Q", int(constant_magic)-1)
else:
print("error")
sys.exit(0)
# llvm operand size
magic_l = [magic_ori[:l] for l in [1,2,4,8]]
# write magic bytes to input and check branch coverage
for hot_offset in hot_offsets:
for magic in magic_l:
tmp_seed = init_seed.copy()
tmp_seed[hot_offset:hot_offset+len(magic)] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance > 0 and hit == 2) or (init_distance <= 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
if (hot_offset+1) >= len(magic):
tmp_seed = init_seed.copy()
tmp_seed[hot_offset-len(magic)+1 :hot_offset+1] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance > 0 and hit == 2) or (init_distance <= 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
# crack early exit
if crack_bool:
break
if br_type == 2 or br_type == 7 or br_type == 11:
t0 = time.time()
seed_id = v[0]
init_seed = bytearray(open(seeds[seed_id],'rb').read())
print("br id: " + str(k) + " br len: " + str(lenn) + " br type: " + str(br_type) + " magic: " + constant_magic + " magic_loc: " + str(constant_loc) + " file len: " + str(len(init_seed)))
# clean tmp dir
for f in glob.glob("./tmp_train/*"):
os.remove(f)
# create baseline file
with open("./tmp_train/"+str("121212"),'wb') as f:
f.write(init_seed)
# generate sample inputs
for i in range(len(init_seed)):
tmp_seed = init_seed.copy()
for val in possible_val:
tmp_seed[i] = val
with open("./tmp_train/"+str(i)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# parse variable values for each sample inputs
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_train', '-o', './tmp_train', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8", errors='ignore')
t1 = time.time()
print("obtain_br time cost " + str(t1-t0))
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
t2 = time.time()
print("parse obtain_br result time cost " + str(t2-t1))
if '121212' not in tmp_dict:
continue
init_op1 = tmp_dict['121212'][0]
init_op2 = tmp_dict['121212'][1]
init_distance = tmp_dict['121212'][0] - tmp_dict['121212'][1]
hot_offsets = []
min_dist = float('inf')
file_name = ''
# no magic constant case
if constant_loc == 0:
# parse hot bytes
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if ops[0] != init_op1 or ops[1] != init_op2:
# choose the optimal seed as starting point
if abs(distance) < min_dist:
min_dist = abs(distance)
file_name = offset
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance == 0 and init_distance != 0) or (distance != 0 and init_distance == 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
# generate possible candidtate inputs to crack the branch
init_seed = bytearray(open('./tmp_train/'+file_name,'rb').read())
for f in glob.glob("./tmp_non_direct/*"):
os.remove(f)
for hot_offset in hot_offsets[:64]:
tmp_seed = init_seed.copy()
for val in range(255):
tmp_seed[hot_offset] = val
with open("./tmp_non_direct/"+str(hot_offset)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# check results using faster mode binary
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_non_direct', '-o', './tmp_non_direct', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8",errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if (distance == 0 and init_distance != 0) or (distance != 0 and init_distance == 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_non_direct/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# magic constant case
else:
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if distance != init_distance:
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance == 0 and init_distance != 0) or (distance != 0 and init_distance == 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
t3 = time.time()
print("parse distance result time cost " + str(t3-t2))
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
if init_distance != 0:
# construct an equal case to satisfy == case
magic_ori = struct.pack("@Q", int(constant_magic))
else:
# construct an inequality case to safisfy != case
magic_ori = struct.pack("@Q", int(constant_magic)+1)
# llvm operand size
magic_l = [magic_ori[:l] for l in [1,2,4,8]]
# write magic bytes to input and check branch coverage
for hot_offset in hot_offsets:
for magic in magic_l:
tmp_seed = init_seed.copy()
tmp_seed[hot_offset:hot_offset+len(magic)] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance == 0 and hit == 2) or (init_distance != 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
if (hot_offset+1) >= len(magic):
tmp_seed = init_seed.copy()
tmp_seed[hot_offset-len(magic)+1 :hot_offset+1] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance == 0 and hit == 2) or (init_distance != 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
# crack early exit
if crack_bool:
break
t4 = time.time()
print("crack time cost " + str(t4-t3))
#'''
if br_type == 3 or br_type == 4:
seed_id = v[0]
init_seed = bytearray(open(seeds[seed_id],'rb').read())
print("br id: " + str(k) + " br len: " + str(lenn) + " br type: " + str(br_type) + " magic: " + constant_magic + " magic_loc: " + str(constant_loc) + " file len: " + str(len(init_seed)))
# clean tmp dir
for f in glob.glob("./tmp_train/*"):
os.remove(f)
# create baseline file
with open("./tmp_train/"+str("121212"),'wb') as f:
f.write(init_seed)
# generate sample inputs
for i in range(len(init_seed)):
tmp_seed = init_seed.copy()
for val in possible_val:
tmp_seed[i] = val
with open("./tmp_train/"+str(i)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# parse variable values for each sample inputs
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_train', '-o', './tmp_train', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8", errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
if '121212' not in tmp_dict:
continue
init_op1 = tmp_dict['121212'][0]
init_op2 = tmp_dict['121212'][1]
init_distance = tmp_dict['121212'][0] - tmp_dict['121212'][1]
hot_offsets = []
min_dist = float('inf')
file_name = ''
# no magic constant case
if constant_loc == 0:
# parse hot bytes
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if ops[0] != init_op1 or ops[1] != init_op2:
# choose the optimal seed as starting point
if abs(distance) < min_dist:
min_dist = abs(distance)
file_name = offset
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance >= 0 and init_distance < 0) or (distance < 0 and init_distance >= 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
# generate possible candidtate inputs to crack the branch
init_seed = bytearray(open('./tmp_train/'+file_name,'rb').read())
for f in glob.glob("./tmp_non_direct/*"):
os.remove(f)
for hot_offset in hot_offsets[:64]:
tmp_seed = init_seed.copy()
for val in range(255):
tmp_seed[hot_offset] = val
with open("./tmp_non_direct/"+str(hot_offset)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# check results using faster mode binary
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_non_direct', '-o', './tmp_non_direct', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8",errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if (distance >= 0 and init_distance < 0) or (distance < 0 and init_distance >= 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_non_direct/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# magic constant case
else:
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if distance != init_distance:
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance >= 0 and init_distance < 0) or (distance < 0 and init_distance >= 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
if init_distance < 0:
# construct a equal case to staisfy >=
magic_ori = struct.pack("@Q", int(constant_magic))
else:
# construct an < case to safisfy < case
if constant_loc == 2:
if int(constant_magic) == 0:
continue
magic_ori = struct.pack("@Q", int(constant_magic)-1)
elif constant_loc == 1:
magic_ori = struct.pack("@Q", int(constant_magic)+1)
else:
print("error")
sys.exit(0)
# llvm operand size
magic_l = [magic_ori[:l] for l in [1,2,4,8]]
# write magic bytes to input and check branch coverage
for hot_offset in hot_offsets:
for magic in magic_l:
tmp_seed = init_seed.copy()
tmp_seed[hot_offset:hot_offset+len(magic)] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance >= 0 and hit == 2) or (init_distance < 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
if (hot_offset+1) >= len(magic):
tmp_seed = init_seed.copy()
tmp_seed[hot_offset-len(magic)+1 :hot_offset+1] = magic
with open("tmp_input",'wb') as f:
f.write(tmp_seed)
tmp_argvv[6] = argvv[6] + '_br'
out = ''
seed = './tmp_input'
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '500'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
try:
out = check_out(['./afl-showbr', '-q', '-o', '/dev/stdout', '-m', '1024', '-t', '5000'] + tmp_argvv[6:-1] + [seed])
except subprocess.CalledProcessError:
print("### found a crash " + str(k) + " br_tyte "+ br_type)
shutil.copyfile("tmp_input", "./crash/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
for line in out.splitlines():
tokens = line.split(b':')
edge = int(tokens[0])
hit = int(tokens[1])
if edge == k:
if (init_distance >= 0 and hit == 2) or (init_distance < 0 and hit == 1):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("tmp_input", "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, early exit
if crack_bool:
break
# crack early exit
if crack_bool:
break
if br_type == 5 or br_type == 6:
seed_id = v[0]
init_seed = bytearray(open(seeds[seed_id],'rb').read())
print("br id: " + str(k) + " br len: " + str(lenn) + " br type: " + str(br_type) + " magic: " + constant_magic + " magic_loc: " + str(constant_loc) + " file len: " + str(len(init_seed)))
# clean tmp dir
for f in glob.glob("./tmp_train/*"):
os.remove(f)
# create baseline file
with open("./tmp_train/"+str("121212"),'wb') as f:
f.write(init_seed)
# generate sample inputs
for i in range(len(init_seed)):
tmp_seed = init_seed.copy()
for val in possible_val:
tmp_seed[i] = val
with open("./tmp_train/"+str(i)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# parse variable values for each sample inputs
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_train', '-o', './tmp_train', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8", errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
if '121212' not in tmp_dict:
continue
init_op1 = tmp_dict['121212'][0]
init_op2 = tmp_dict['121212'][1]
init_distance = tmp_dict['121212'][0] - tmp_dict['121212'][1]
hot_offsets = []
min_dist = float('inf')
file_name = ''
# no magic constant case
if constant_loc == 0:
# parse hot bytes
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if ops[0] != init_op1 or ops[1] != init_op2:
# choose the optimal seed as starting point
if abs(distance) < min_dist:
min_dist = abs(distance)
file_name = offset
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance < 0 and init_distance >= 0) or (distance >= 0 and init_distance < 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
# generate possible candidtate inputs to crack the branch
init_seed = bytearray(open('./tmp_train/'+file_name,'rb').read())
for f in glob.glob("./tmp_non_direct/*"):
os.remove(f)
for hot_offset in hot_offsets[:64]:
tmp_seed = init_seed.copy()
for val in range(255):
tmp_seed[hot_offset] = val
with open("./tmp_non_direct/"+str(hot_offset)+"_"+str(val),'wb') as f:
f.write(tmp_seed)
# check results using faster mode binary
tmp_argvv[6] = argvv[6] + '_br_fast'
pro = subprocess.run(['./obtain_br','-i','tmp_non_direct', '-o', './tmp_non_direct', '-l', str(len(init_seed)), '-t', str(k)] + tmp_argvv[6:], stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding="utf-8",errors='ignore')
line = pro.stdout
lines = line[line.find('###$$$ obtain br')+18:].split('\n')[:-1]
tmp_dict = {}
# parse result
for line in lines:
tokens = line.split(':')
tokens2 = tokens[1].split(' ')
tmp_dict[tokens[0]] = [int(tokens2[0]), int(tokens2[1])]
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if (distance < 0 and init_distance >= 0) or (distance >= 0 and init_distance < 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_non_direct/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# magic constant case
else:
for offset, ops in tmp_dict.items():
distance = ops[0] - ops[1]
if distance != init_distance:
loc_offset = int(offset.split('_')[0])
if loc_offset not in hot_offsets:
hot_offsets.append(loc_offset)
if (distance < 0 and init_distance >= 0) or (distance >= 0 and init_distance < 0):
print("###crack branch " + str(k) + " br_tyte "+ str(br_type) + " constant_loc " + str(constant_loc))
shutil.copyfile("./tmp_train/"+str(offset), "./seeds/id_0_"+str(k)+"_"+str(mut_cnt))
mut_cnt = mut_cnt + 1
crack_bool = True
break
# crack success, skip to next branch
if crack_bool:
continue
# no hot byte candidates, skip
if len(hot_offsets)==0:
continue
if init_distance < 0:
# construct an equal case to satisfy >= case
magic_ori = struct.pack("@Q", int(constant_magic))
else:
# construct an < case to safisfy < case
if constant_loc == 2:
if int(constant_magic) == 0:
continue
magic_ori = struct.pack("@Q", int(constant_magic)-1)
elif constant_loc == 1:
magic_ori = struct.pack("@Q", int(constant_magic)+1)
else:
print("error")
sys.exit(0)
# llvm operand size
magic_l = [magic_ori[:l] for l in [1,2,4,8]]