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
|
//===- FuzzerDataFlowTrace.h - Internal header for the Fuzzer ---*- C++ -* ===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// fuzzer::DataFlowTrace; reads and handles a data-flow trace.
//
// A data flow trace is generated by e.g. dataflow/DataFlow.cpp
// and is stored on disk in a separate directory.
//
// The trace dir contains a file 'functions.txt' which lists function names,
// oner per line, e.g.
// ==> functions.txt <==
// Func2
// LLVMFuzzerTestOneInput
// Func1
//
// All other files in the dir are the traces, see dataflow/DataFlow.cpp.
// The name of the file is sha1 of the input used to generate the trace.
//
// Current status:
// the data is parsed and the summary is printed, but the data is not yet
// used in any other way.
//===----------------------------------------------------------------------===//
#ifndef LLVM_FUZZER_DATA_FLOW_TRACE
#define LLVM_FUZZER_DATA_FLOW_TRACE
#include "FuzzerDefs.h"
#include "FuzzerIO.h"
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <string>
namespace fuzzer {
int CollectDataFlow(const std::string &DFTBinary, const std::string &DirPath,
const std::vector<SizedFile> &CorporaFiles);
class BlockCoverage {
public:
// These functions guarantee no CoverageVector is longer than UINT32_MAX.
bool AppendCoverage(std::istream &IN);
bool AppendCoverage(const std::string &S);
size_t NumCoveredFunctions() const { return Functions.size(); }
uint32_t GetCounter(size_t FunctionId, size_t BasicBlockId) {
auto It = Functions.find(FunctionId);
if (It == Functions.end())
return 0;
const auto &Counters = It->second;
if (BasicBlockId < Counters.size())
return Counters[BasicBlockId];
return 0;
}
uint32_t GetNumberOfBlocks(size_t FunctionId) {
auto It = Functions.find(FunctionId);
if (It == Functions.end()) return 0;
const auto &Counters = It->second;
return static_cast<uint32_t>(Counters.size());
}
uint32_t GetNumberOfCoveredBlocks(size_t FunctionId) {
auto It = Functions.find(FunctionId);
if (It == Functions.end()) return 0;
const auto &Counters = It->second;
uint32_t Result = 0;
for (auto Cnt: Counters)
if (Cnt)
Result++;
return Result;
}
std::vector<double> FunctionWeights(size_t NumFunctions) const;
void clear() { Functions.clear(); }
private:
typedef std::vector<uint32_t> CoverageVector;
uint32_t NumberOfCoveredBlocks(const CoverageVector &Counters) const {
uint32_t Res = 0;
for (auto Cnt : Counters)
if (Cnt)
Res++;
return Res;
}
uint32_t NumberOfUncoveredBlocks(const CoverageVector &Counters) const {
return static_cast<uint32_t>(Counters.size()) -
NumberOfCoveredBlocks(Counters);
}
uint32_t SmallestNonZeroCounter(const CoverageVector &Counters) const {
assert(!Counters.empty());
uint32_t Res = Counters[0];
for (auto Cnt : Counters)
if (Cnt)
Res = Min(Res, Cnt);
assert(Res);
return Res;
}
// Function ID => vector of counters.
// Each counter represents how many input files trigger the given basic block.
std::unordered_map<size_t, CoverageVector> Functions;
// Functions that have DFT entry.
std::unordered_set<size_t> FunctionsWithDFT;
};
class DataFlowTrace {
public:
void ReadCoverage(const std::string &DirPath);
bool Init(const std::string &DirPath, std::string *FocusFunction,
std::vector<SizedFile> &CorporaFiles, Random &Rand);
void Clear() { Traces.clear(); }
const std::vector<uint8_t> *Get(const std::string &InputSha1) const {
auto It = Traces.find(InputSha1);
if (It != Traces.end())
return &It->second;
return nullptr;
}
private:
// Input's sha1 => DFT for the FocusFunction.
std::unordered_map<std::string, std::vector<uint8_t>> Traces;
BlockCoverage Coverage;
std::unordered_set<std::string> CorporaHashes;
};
} // namespace fuzzer
#endif // LLVM_FUZZER_DATA_FLOW_TRACE
|
