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/*
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"
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/IR/PassManager.h"
#else
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#endif
#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"
#if LLVM_VERSION_MAJOR >= 4 || \
(LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR > 4)
#include "llvm/IR/Verifier.h"
#include "llvm/IR/DebugInfo.h"
#else
#include "llvm/Analysis/Verifier.h"
#include "llvm/DebugInfo.h"
#define nullptr 0
#endif
#include <set>
#include "afl-llvm-common.h"
using namespace llvm;
namespace {
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
class InjectionRoutines : public PassInfoMixin<InjectionRoutines> {
public:
InjectionRoutines() {
#else
class InjectionRoutines : public ModulePass {
public:
static char ID;
InjectionRoutines() : ModulePass(ID) {
#endif
initInstrumentList();
}
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
#else
bool runOnModule(Module &M) override;
#if LLVM_VERSION_MAJOR >= 4
StringRef getPassName() const override {
#else
const char *getPassName() const override {
#endif
return "Injection routines";
}
#endif
private:
bool hookRtns(Module &M);
bool doSQL = false;
bool doLDAP = false;
bool doXSS = false;
};
} // namespace
#if LLVM_MAJOR >= 11
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) {
#if LLVM_VERSION_MAJOR <= 13
using OptimizationLevel = typename PassBuilder::OptimizationLevel;
#endif
PB.registerOptimizerLastEPCallback(
[](ModulePassManager &MPM, OptimizationLevel OL) {
MPM.addPass(InjectionRoutines());
});
}};
}
#else
char InjectionRoutines::ID = 0;
#endif
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);
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee
#else
Constant *
#endif
c1 = M.getOrInsertFunction("__afl_injection_sql", VoidTy, i8PtrTy
#if LLVM_VERSION_MAJOR < 5
,
NULL
#endif
);
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee sqlfunc = c1;
#else
Function *sqlfunc = cast<Function>(c1);
#endif
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee
#else
Constant *
#endif
c2 = M.getOrInsertFunction("__afl_injection_ldap", VoidTy, i8PtrTy
#if LLVM_VERSION_MAJOR < 5
,
NULL
#endif
);
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee ldapfunc = c2;
#else
Function *ldapfunc = cast<Function>(c2);
#endif
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee
#else
Constant *
#endif
c3 = M.getOrInsertFunction("__afl_injection_xss", VoidTy, i8PtrTy
#if LLVM_VERSION_MAJOR < 5
,
NULL
#endif
);
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee xssfunc = c3;
#else
Function *xssfunc = cast<Function>(c3);
#endif
#if LLVM_VERSION_MAJOR >= 9
FunctionCallee FuncPtr;
#else
Function *FuncPtr;
#endif
/* 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);
Value *parameter = callInst->getArgOperand(param);
std::vector<Value *> args;
Value *casted = IRB.CreatePointerCast(parameter, i8PtrTy);
args.push_back(casted);
IRB.CreateCall(FuncPtr, args);
}
}
}
}
}
return true;
}
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
PreservedAnalyses InjectionRoutines::run(Module &M,
ModuleAnalysisManager &MAM) {
#else
bool InjectionRoutines::runOnModule(Module &M) {
#endif
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; }
hookRtns(M);
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
auto PA = PreservedAnalyses::all();
#endif
verifyModule(M);
#if LLVM_VERSION_MAJOR >= 11 /* use new pass manager */
return PA;
#else
return true;
#endif
}
#if LLVM_VERSION_MAJOR < 11 /* use old pass manager */
static void registerInjectionRoutinesPass(const PassManagerBuilder &,
legacy::PassManagerBase &PM) {
auto p = new InjectionRoutines();
PM.add(p);
}
static RegisterStandardPasses RegisterInjectionRoutinesPass(
PassManagerBuilder::EP_OptimizerLast, registerInjectionRoutinesPass);
static RegisterStandardPasses RegisterInjectionRoutinesPass0(
PassManagerBuilder::EP_EnabledOnOptLevel0, registerInjectionRoutinesPass);
#if LLVM_VERSION_MAJOR >= 11
static RegisterStandardPasses RegisterInjectionRoutinesPassLTO(
PassManagerBuilder::EP_FullLinkTimeOptimizationLast,
registerInjectionRoutinesPass);
#endif
#endif
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