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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/*
american fuzzy lop++ - LLVM Injection instrumentation
--------------------------------------------------
Written by Marc Heuse <mh@mh-sec.de>
Copyright 2015, 2016 Google Inc. All rights reserved.
Copyright 2019-2024 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
https://www.apache.org/licenses/LICENSE-2.0
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <list>
#include <string>
#include <fstream>
#include <sys/time.h>
#include "llvm/Config/llvm-config.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#if LLVM_VERSION_MAJOR < 17
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#endif
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IR/DebugInfo.h"
#include <set>
#include "afl-llvm-common.h"
using namespace llvm;
namespace {
class InjectionRoutines : public PassInfoMixin<InjectionRoutines> {
public:
InjectionRoutines() {
initInstrumentList();
}
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
private:
bool hookRtns(Module &M);
bool doSQL = false;
bool doLDAP = false;
bool doXSS = false;
};
} // namespace
extern "C" ::llvm::PassPluginLibraryInfo LLVM_ATTRIBUTE_WEAK
llvmGetPassPluginInfo() {
return {LLVM_PLUGIN_API_VERSION, "Injectionroutines", "v0.1",
/* lambda to insert our pass into the pass pipeline. */
[](PassBuilder &PB) {
PB.registerOptimizerLastEPCallback([](ModulePassManager &MPM,
OptimizationLevel OL
#if LLVM_VERSION_MAJOR >= 20
,
ThinOrFullLTOPhase Phase
#endif
) {
MPM.addPass(InjectionRoutines());
});
}};
}
bool InjectionRoutines::hookRtns(Module &M) {
std::vector<CallInst *> calls, llvmStdStd, llvmStdC, gccStdStd, gccStdC,
Memcmp, Strcmp, Strncmp;
LLVMContext &C = M.getContext();
Type *VoidTy = Type::getVoidTy(C);
IntegerType *Int8Ty = IntegerType::getInt8Ty(C);
PointerType *i8PtrTy = PointerType::get(Int8Ty, 0);
FunctionCallee c1 =
M.getOrInsertFunction("__afl_injection_sql", VoidTy, i8PtrTy);
FunctionCallee sqlfunc = c1;
FunctionCallee c2 =
M.getOrInsertFunction("__afl_injection_ldap", VoidTy, i8PtrTy);
FunctionCallee ldapfunc = c2;
FunctionCallee c3 =
M.getOrInsertFunction("__afl_injection_xss", VoidTy, i8PtrTy);
FunctionCallee xssfunc = c3;
FunctionCallee FuncPtr;
bool ret = false;
/* iterate over all functions, bbs and instruction and add suitable calls */
for (auto &F : M) {
if (!isInInstrumentList(&F, MNAME)) continue;
for (auto &BB : F) {
for (auto &IN : BB) {
CallInst *callInst = nullptr;
if ((callInst = dyn_cast<CallInst>(&IN))) {
Function *Callee = callInst->getCalledFunction();
if (!Callee) continue;
if (callInst->getCallingConv() != llvm::CallingConv::C) continue;
std::string FuncName = Callee->getName().str();
FuncPtr = nullptr;
size_t param = 0;
// Marker: ADD_TO_INJECTIONS
// If you just need to add another function to test for SQL etc.
// then add them here.
// To add a new class or to work on e.g. std::string/Rust strings/...
// you will need to add a function to afl-compiler-rt.c.o and
// and upwards in this file add a pointer to that function to use
// here.
if (doSQL &&
(FuncName.compare("sqlite3_exec") == 0 ||
FuncName.compare("PQexec") == 0 || FuncName.compare("") == 0 ||
FuncName.compare("PQexecParams") == 0 ||
FuncName.compare("mysql_query") == 0)) {
if (!be_quiet) {
errs() << "Injection SQL hook: " << FuncName << "\n";
}
FuncPtr = sqlfunc;
param = 1;
}
if (doLDAP && (FuncName.compare("ldap_search_ext") == 0 ||
FuncName.compare("ldap_search_ext_s") == 0)) {
if (!be_quiet) {
errs() << "Injection LDAP hook: " << FuncName << "\n";
}
FuncPtr = ldapfunc;
param = 1;
}
if (doXSS && (FuncName.compare("htmlReadMemory") == 0)) {
if (!be_quiet) {
errs() << "Injection XSS hook: " << FuncName << "\n";
}
FuncPtr = xssfunc;
param = 1;
}
if (FuncPtr) {
IRBuilder<> IRB(callInst->getParent());
IRB.SetInsertPoint(callInst);
ret = true;
Value *parameter = callInst->getArgOperand(param);
std::vector<Value *> args;
Value *casted = IRB.CreatePointerCast(parameter, i8PtrTy);
args.push_back(casted);
IRB.CreateCall(FuncPtr, args);
}
}
}
}
}
return ret;
}
PreservedAnalyses InjectionRoutines::run(Module &M,
ModuleAnalysisManager &MAM) {
if (getenv("AFL_QUIET") == NULL)
printf("Running injection-pass by Marc Heuse (mh@mh-sec.de)\n");
else
be_quiet = 1;
if (getenv("AFL_LLVM_INJECTIONS_ALL")) {
doSQL = true;
doLDAP = true;
doXSS = true;
}
if (getenv("AFL_LLVM_INJECTIONS_SQL")) { doSQL = true; }
if (getenv("AFL_LLVM_INJECTIONS_LDAP")) { doLDAP = true; }
if (getenv("AFL_LLVM_INJECTIONS_XSS")) { doXSS = true; }
bool ret = hookRtns(M);
verifyModule(M);
if (ret == false)
return PreservedAnalyses::all();
else
return PreservedAnalyses();
}
|
