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/*
american fuzzy lop++ - LLVM-mode instrumentation pass
---------------------------------------------------
Written by Laszlo Szekeres <lszekeres@google.com> and
Michal Zalewski
LLVM integration design comes from Laszlo Szekeres. C bits copied-and-pasted
from afl-as.c are Michal's fault.
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
This library is plugged into LLVM when invoking clang through afl-clang-fast.
It tells the compiler to add code roughly equivalent to the bits discussed
in ../afl-as.h.
*/
#define AFL_LLVM_PASS
#include "config.h"
#include "debug.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <list>
#include <string>
#include <fstream>
#include <sys/time.h>
#include <fnmatch.h>
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
// #include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/CFG.h"
#if LLVM_VERSION_MAJOR >= 14 /* how about stable interfaces? */
#include "llvm/Passes/OptimizationLevel.h"
#endif
#include "afl-llvm-common.h"
using namespace llvm;
namespace {
class AFLcheckIfInstrument : public PassInfoMixin<AFLcheckIfInstrument> {
public:
AFLcheckIfInstrument() {
if (getenv("AFL_DEBUG")) debug = 1;
initInstrumentList();
}
PreservedAnalyses run(Module &M, ModuleAnalysisManager &MAM);
protected:
std::list<std::string> myInstrumentList;
};
} // namespace
extern "C" ::llvm::PassPluginLibraryInfo LLVM_ATTRIBUTE_WEAK
llvmGetPassPluginInfo() {
return {LLVM_PLUGIN_API_VERSION, "AFLcheckIfInstrument", "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(AFLcheckIfInstrument());
});
}};
}
PreservedAnalyses AFLcheckIfInstrument::run(Module &M,
ModuleAnalysisManager &MAM) {
/* Show a banner */
setvbuf(stdout, NULL, _IONBF, 0);
if ((isatty(2) && !getenv("AFL_QUIET")) || getenv("AFL_DEBUG") != NULL) {
SAYF(cCYA "afl-llvm-lto-instrumentlist" VERSION cRST
" by Marc \"vanHauser\" Heuse <mh@mh-sec.de>\n");
} else if (getenv("AFL_QUIET"))
be_quiet = 1;
for (auto &F : M) {
if (F.size() < 1) continue;
// fprintf(stderr, "F:%s\n", F.getName().str().c_str());
if (isInInstrumentList(&F, MNAME)) {
if (debug)
DEBUGF("function %s is in the instrument file list\n",
F.getName().str().c_str());
} else {
if (debug)
DEBUGF("function %s is NOT in the instrument file list\n",
F.getName().str().c_str());
auto &Ctx = F.getContext();
AttributeList Attrs = F.getAttributes();
#if LLVM_VERSION_MAJOR >= 14
AttributeList NewAttrs = Attrs.addFnAttribute(Ctx, "skipinstrument");
F.setAttributes(NewAttrs);
#else
AttrBuilder NewAttrs;
NewAttrs.addAttribute("skipinstrument");
F.setAttributes(
Attrs.addAttributes(Ctx, AttributeList::FunctionIndex, NewAttrs));
#endif
}
}
auto PA = PreservedAnalyses::all();
return PA;
}
#if 0
static void registerAFLcheckIfInstrumentpass(const PassManagerBuilder &,
legacy::PassManagerBase &PM) {
PM.add(new AFLcheckIfInstrument());
}
static RegisterStandardPasses RegisterAFLcheckIfInstrumentpass(
PassManagerBuilder::EP_ModuleOptimizerEarly,
registerAFLcheckIfInstrumentpass);
static RegisterStandardPasses RegisterAFLcheckIfInstrumentpass0(
PassManagerBuilder::EP_EnabledOnOptLevel0,
registerAFLcheckIfInstrumentpass);
#endif
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