1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
import random, subprocess, difflib
while True:
# Random decisions
num = random.randint(2, 250)
density = random.random() * random.random()
decisions = [random.randint(1, num*20) for x in range(num*3)]
branches = [0]*num
defaults = [0]*num
for i in range(num):
b = set([])
bs = random.randint(1, max(1, round(density*random.random()*(num-1))))
for j in range(bs):
b.add(random.randint(1, num-1))
b = list(b)
defaults[i] = random.choice(b)
b.remove(defaults[i])
branches[i] = b
print num, density
for temp in ['fuzz', 'fuzz.fast.js', 'fuzz.slow.js', 'fuzz.cpp']:
try:
os.unlink(temp)
except:
pass
# parts
entry = '''print('entry'); var label; var state; var modded; var decisions = %s; var index = 0; function check() { if (index == decisions.length) throw 'HALT'; return decisions[index++] }''' % str(decisions)
slow = entry + '\n'
for i in range(len(branches[0])):
if i > 0: slow += 'else '
b = branches[0]
slow += 'if (modded == %d) { label = %d; }\n' % (i, b[i]) # TODO: split range 1-n into these options
if len(branches[0]): slow += 'else '
slow += 'label = %d;\n' % defaults[0]
slow += '''
while(1) switch(label) {
'''
fast = '''
#include <stdlib.h>
#include "Relooper.h"
int main() {
char *buffer = (char*)malloc(10*1024*1024);
'''
if random.randint(0, 1) == 0:
make = False
fast += '''
Relooper::SetOutputBuffer(buffer, 10*1024*1024);
'''
else:
make = True
fast += '''
Relooper::MakeOutputBuffer(%d);
''' % random.randint(1, 1024*1024*10)
for i in range(1, num):
slow += ' case %d: print(%d); state = check(); modded = state %% %d\n' % (i, i, len(branches[i])+1)
b = branches[i]
for j in range(len(b)):
slow += ' if (modded == %d) { label = %d; break }\n' % (j, b[j]) # TODO: split range 1-n into these options
slow += ' label = %d; break\n' % defaults[i]
branch_vars = []
for i in range(num):
branch_var = '"modded"' if len(branches[i]) > 0 and not (len(branches[i]) == 1 and random.random() < 0.5) else 'NULL'
branch_vars.append(branch_var)
if i == 0:
fast += '''
Block *b%d = new Block("%s", %s);
''' % (i, entry, branch_var)
else:
fast += ''' Block *b%d = new Block("print(%d); state = check(); modded = state %% %d; %s", %s);
''' % (i, i, len(branches[i])+1, '// ' + ('.' * int(random.expovariate(0.5/num))), branch_var)
for i in range(num):
branch_var = branch_vars[i]
b = branches[i]
for j in range(len(b)):
if branch_var == 'NULL':
fast += ''' b%d->AddBranchTo(b%d, "modded == %d");
''' % (i, b[j], j)
else:
fast += ''' b%d->AddBranchTo(b%d, "case %d:");
''' % (i, b[j], j)
fast += ''' b%d->AddBranchTo(b%d, NULL);
''' % (i, defaults[i])
fast += '''
Relooper r;
'''
if random.random() < 0.1:
print 'emulate'
fast += '''
r.SetEmulate(true);
'''
for i in range(num):
fast += ''' r.AddBlock(b%d);
''' % i
fast += '''
r.Calculate(b0);
printf("\\n\\n");
r.Render();
puts(%s);
return 1;
}
''' % ('buffer' if not make else 'Relooper::GetOutputBuffer()')
slow += '}'
open('fuzz.slow.js', 'w').write(slow)
open('fuzz.cpp', 'w').write(fast)
print '_'
slow_out = subprocess.Popen(['mozjs', '-m', '-n', 'fuzz.slow.js'], stdout=subprocess.PIPE).communicate()[0]
print '.'
subprocess.call(['g++', 'fuzz.cpp', 'Relooper.o', '-o', 'fuzz', '-g'])
print '*'
subprocess.call(['./fuzz'], stdout=open('fuzz.fast.js', 'w'))
print '-'
fast_out = subprocess.Popen(['mozjs', '-m', '-n', 'fuzz.fast.js'], stdout=subprocess.PIPE).communicate()[0]
print
if slow_out != fast_out:
print ''.join([a.rstrip()+'\n' for a in difflib.unified_diff(slow_out.split('\n'), fast_out.split('\n'), fromfile='slow', tofile='fast')])
assert False
#break
|
