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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
//===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// Fuzzer's main loop.
//===----------------------------------------------------------------------===//
#include "FuzzerInternal.h"
#include <sanitizer/asan_interface.h>
#include <algorithm>
#include <string>
#include <iostream>
#include <stdlib.h>
// This function should be defined by the user.
extern "C" void TestOneInput(const uint8_t *Data, size_t Size);
namespace fuzzer {
// static
Unit Fuzzer::CurrentUnit;
system_clock::time_point Fuzzer::UnitStartTime;
void Fuzzer::SetDeathCallback() {
__sanitizer_set_death_callback(DeathCallback);
}
void Fuzzer::DeathCallback() {
std::cerr << "DEATH: " << std::endl;
Print(CurrentUnit, "\n");
PrintASCII(CurrentUnit, "\n");
WriteToCrash(CurrentUnit, "crash-");
}
void Fuzzer::AlarmCallback() {
size_t Seconds =
duration_cast<seconds>(system_clock::now() - UnitStartTime).count();
std::cerr << "ALARM: working on the last Unit for " << Seconds << " seconds"
<< std::endl;
if (Seconds > 60) {
Print(CurrentUnit, "\n");
PrintASCII(CurrentUnit, "\n");
WriteToCrash(CurrentUnit, "timeout-");
}
abort();
}
void Fuzzer::ShuffleAndMinimize() {
if (Options.Verbosity)
std::cerr << "Shuffle: " << Corpus.size() << "\n";
std::vector<Unit> NewCorpus;
random_shuffle(Corpus.begin(), Corpus.end());
size_t MaxCov = 0;
Unit &U = CurrentUnit;
for (const auto &C : Corpus) {
for (size_t First = 0; First < 1; First++) {
U.clear();
size_t Last = std::min(First + Options.MaxLen, C.size());
U.insert(U.begin(), C.begin() + First, C.begin() + Last);
size_t NewCoverage = RunOne(U);
if (NewCoverage) {
MaxCov = NewCoverage;
NewCorpus.push_back(U);
if (Options.Verbosity >= 2)
std::cerr << "NEW0: " << NewCoverage << "\n";
}
}
}
Corpus = NewCorpus;
if (Options.Verbosity)
std::cerr << "Shuffle done: " << Corpus.size() << " IC: " << MaxCov << "\n";
}
size_t Fuzzer::RunOne(const Unit &U) {
UnitStartTime = system_clock::now();
TotalNumberOfRuns++;
size_t OldCoverage = __sanitizer_get_total_unique_coverage();
TestOneInput(U.data(), U.size());
size_t NewCoverage = __sanitizer_get_total_unique_coverage();
if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) && Options.Verbosity) {
size_t Seconds =
duration_cast<seconds>(system_clock::now() - ProcessStartTime).count();
std::cerr
<< "#" << TotalNumberOfRuns
<< "\tcov: " << NewCoverage
<< "\texec/s: " << (Seconds ? TotalNumberOfRuns / Seconds : 0) << "\n";
}
if (NewCoverage > OldCoverage)
return NewCoverage;
return 0;
}
void Fuzzer::WriteToOutputCorpus(const Unit &U) {
if (Options.OutputCorpus.empty()) return;
std::string Path = Options.OutputCorpus + "/" + Hash(U);
WriteToFile(U, Path);
if (Options.Verbosity >= 2)
std::cerr << "Written to " << Path << std::endl;
}
void Fuzzer::WriteToCrash(const Unit &U, const char *Prefix) {
std::string Path = Prefix + Hash(U);
WriteToFile(U, Path);
std::cerr << "CRASHED; file written to " << Path << std::endl;
}
size_t Fuzzer::MutateAndTestOne(Unit *U) {
size_t NewUnits = 0;
for (size_t i = 0; i < Options.MutateDepth; i++) {
Mutate(U, Options.MaxLen);
if (U->empty()) continue;
size_t NewCoverage = RunOne(*U);
if (NewCoverage) {
Corpus.push_back(*U);
NewUnits++;
if (Options.Verbosity) {
std::cerr << "#" << TotalNumberOfRuns
<< "\tNEW: " << NewCoverage
<< " L: " << U->size()
<< "\t";
if (U->size() < 30) {
PrintASCII(*U);
std::cerr << "\t";
Print(*U);
}
std::cerr << "\n";
}
WriteToOutputCorpus(*U);
if (Options.ExitOnFirst)
exit(0);
}
}
return NewUnits;
}
size_t Fuzzer::Loop(size_t NumIterations) {
size_t NewUnits = 0;
for (size_t i = 1; i <= NumIterations; i++) {
if (Options.DoCrossOver) {
for (size_t J1 = 0; J1 < Corpus.size(); J1++) {
for (size_t J2 = 0; J2 < Corpus.size(); J2++) {
CurrentUnit.clear();
CrossOver(Corpus[J1], Corpus[J2], &CurrentUnit, Options.MaxLen);
NewUnits += MutateAndTestOne(&CurrentUnit);
}
}
} else { // No CrossOver
for (size_t J = 0; J < Corpus.size(); J++) {
CurrentUnit = Corpus[J];
NewUnits += MutateAndTestOne(&CurrentUnit);
}
}
}
return NewUnits;
}
} // namespace fuzzer
|
