[llvm] r227252 - Add a Fuzzer library
Aaron Ballman
aaron at aaronballman.com
Thu Jan 29 07:11:44 PST 2015
This commit puts the fuzzer targets on the top-level for MSVC
solutions when they should be in a separate folder instead. Picture
attached is worth 1000 words. ;-)
~Aaron
On Tue, Jan 27, 2015 at 5:08 PM, Kostya Serebryany <kcc at google.com> wrote:
> Author: kcc
> Date: Tue Jan 27 16:08:41 2015
> New Revision: 227252
>
> URL: http://llvm.org/viewvc/llvm-project?rev=227252&view=rev
> Log:
> Add a Fuzzer library
>
> Summary:
> A simple genetic in-process coverage-guided fuzz testing library.
>
> I've used this fuzzer to test clang-format
> (it found 12+ bugs, thanks djasper@ for the fixes!)
> and it may also help us test other parts of LLVM.
> So why not keep it in the LLVM repository?
>
> I plan to add the cmake build rules later (in a separate patch, if that's ok)
> and also add a clang-format-fuzzer target.
>
> See README.txt for details.
>
> Test Plan: Tests will follow separately.
>
> Reviewers: djasper, chandlerc, rnk
>
> Reviewed By: rnk
>
> Subscribers: majnemer, ygribov, dblaikie, llvm-commits
>
> Differential Revision: http://reviews.llvm.org/D7184
>
> Added:
> llvm/trunk/lib/Fuzzer/
> llvm/trunk/lib/Fuzzer/CMakeLists.txt
> llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp
> llvm/trunk/lib/Fuzzer/FuzzerFlags.def
> llvm/trunk/lib/Fuzzer/FuzzerIO.cpp
> llvm/trunk/lib/Fuzzer/FuzzerInternal.h
> llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp
> llvm/trunk/lib/Fuzzer/FuzzerMain.cpp
> llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp
> llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp
> llvm/trunk/lib/Fuzzer/README.txt
> llvm/trunk/lib/Fuzzer/test/
> llvm/trunk/lib/Fuzzer/test/ExactTest.cpp
> llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp
> llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp
> llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp
> llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp
> llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp
> Modified:
> llvm/trunk/lib/CMakeLists.txt
>
> Modified: llvm/trunk/lib/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CMakeLists.txt?rev=227252&r1=227251&r2=227252&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CMakeLists.txt (original)
> +++ llvm/trunk/lib/CMakeLists.txt Tue Jan 27 16:08:41 2015
> @@ -17,3 +17,4 @@ add_subdirectory(Target)
> add_subdirectory(AsmParser)
> add_subdirectory(LineEditor)
> add_subdirectory(ProfileData)
> +add_subdirectory(Fuzzer)
>
> Added: llvm/trunk/lib/Fuzzer/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/CMakeLists.txt?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/CMakeLists.txt (added)
> +++ llvm/trunk/lib/Fuzzer/CMakeLists.txt Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,9 @@
> +add_library(LLVMFuzzer STATIC
> + EXCLUDE_FROM_ALL # Do not build if you are not building fuzzers.
> + FuzzerCrossOver.cpp
> + FuzzerIO.cpp
> + FuzzerLoop.cpp
> + FuzzerMain.cpp
> + FuzzerMutate.cpp
> + FuzzerUtil.cpp
> + )
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,46 @@
> +//===- FuzzerCrossOver.cpp - Cross over two test inputs -------------------===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// Cross over test inputs.
> +//===----------------------------------------------------------------------===//
> +
> +#include "FuzzerInternal.h"
> +
> +namespace fuzzer {
> +
> +// Cross A and B, store the result (ap to MaxLen bytes) in U.
> +void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen) {
> + size_t Size = rand() % MaxLen + 1;
> + U->clear();
> + const Unit *V = &A;
> + size_t PosA = 0;
> + size_t PosB = 0;
> + size_t *Pos = &PosA;
> + while (U->size() < Size && (PosA < A.size() || PosB < B.size())) {
> + // Merge a part of V into U.
> + size_t SizeLeftU = Size - U->size();
> + if (*Pos < V->size()) {
> + size_t SizeLeftV = V->size() - *Pos;
> + size_t MaxExtraSize = std::min(SizeLeftU, SizeLeftV);
> + size_t ExtraSize = rand() % MaxExtraSize + 1;
> + U->insert(U->end(), V->begin() + *Pos, V->begin() + *Pos + ExtraSize);
> + (*Pos) += ExtraSize;
> + }
> +
> + // Use the other Unit on the next iteration.
> + if (Pos == &PosA) {
> + Pos = &PosB;
> + V = &B;
> + } else {
> + Pos = &PosA;
> + V = &A;
> + }
> + }
> +}
> +
> +} // namespace fuzzer
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerFlags.def
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerFlags.def?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerFlags.def (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerFlags.def Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,24 @@
> +//===- FuzzerFlags.def - Run-time flags -------------------------*- C++ -* ===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// Flags. FUZZER_FLAG macro should be defined at the point of inclusion.
> +// We are not using any flag parsing library for better portability and
> +// independence.
> +//===----------------------------------------------------------------------===//
> +FUZZER_FLAG(int, verbosity, 1, "Verbosity level.")
> +FUZZER_FLAG(int, seed, 0, "Random seed. If 0, seed is generated.")
> +FUZZER_FLAG(int, iterations, -1,
> + "Number of iterations of the fuzzer (-1 for infinite runs).")
> +FUZZER_FLAG(int, max_len, 64, "Maximal length of the test input.")
> +FUZZER_FLAG(int, cross_over, 1, "If 1, cross over inputs.")
> +FUZZER_FLAG(int, mutate_depth, 10,
> + "Apply this number of consecutive mutations to each input.")
> +FUZZER_FLAG(int, exit_on_first, 0,
> + "If 1, exit after the first new interesting input is found.")
> +FUZZER_FLAG(int, timeout, -1, "Timeout in seconds (if positive).")
> +FUZZER_FLAG(int, help, 0, "Print help.")
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerIO.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerIO.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerIO.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerIO.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,44 @@
> +//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// IO functions.
> +//===----------------------------------------------------------------------===//
> +#include "FuzzerInternal.h"
> +#include <fstream>
> +#include <dirent.h>
> +namespace fuzzer {
> +
> +std::vector<std::string> ListFilesInDir(const std::string &Dir) {
> + std::vector<std::string> V;
> + DIR *D = opendir(Dir.c_str());
> + if (!D) return V;
> + while (auto E = readdir(D)) {
> + if (E->d_type == DT_REG || E->d_type == DT_LNK)
> + V.push_back(E->d_name);
> + }
> + closedir(D);
> + return V;
> +}
> +
> +Unit FileToVector(const std::string &Path) {
> + std::ifstream T(Path);
> + return Unit((std::istreambuf_iterator<char>(T)),
> + std::istreambuf_iterator<char>());
> +}
> +
> +void WriteToFile(const Unit &U, const std::string &Path) {
> + std::ofstream OF(Path);
> + OF.write((const char*)U.data(), U.size());
> +}
> +
> +void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V) {
> + for (auto &X : ListFilesInDir(Path))
> + V->push_back(FileToVector(std::string(Path) + "/" + X));
> +}
> +
> +} // namespace fuzzer
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerInternal.h
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerInternal.h?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerInternal.h (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerInternal.h Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,77 @@
> +//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// Define the main class fuzzer::Fuzzer and most functions.
> +//===----------------------------------------------------------------------===//
> +#include <cassert>
> +#include <chrono>
> +#include <cstddef>
> +#include <cstdlib>
> +#include <string>
> +#include <vector>
> +
> +namespace fuzzer {
> +typedef std::vector<uint8_t> Unit;
> +using namespace std::chrono;
> +
> +Unit ReadFile(const char *Path);
> +std::vector<std::string> ListFilesInDir(const std::string &Dir);
> +void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V);
> +void WriteToFile(const Unit &U, const std::string &Path);
> +
> +void Mutate(Unit *U, size_t MaxLen);
> +
> +void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen);
> +
> +void Print(const Unit &U, const char *PrintAfter = "");
> +void PrintASCII(const Unit &U, const char *PrintAfter = "");
> +std::string Hash(const Unit &U);
> +void SetTimer(int Seconds);
> +
> +class Fuzzer {
> + public:
> + struct FuzzingOptions {
> + int Verbosity = 1;
> + int MaxLen = 0;
> + bool DoCrossOver = true;
> + bool MutateDepth = 10;
> + bool ExitOnFirst = false;
> + std::string OutputCorpus;
> + };
> + Fuzzer(FuzzingOptions Options) : Options(Options) {
> + SetDeathCallback();
> + }
> + void AddToCorpus(const Unit &U) { Corpus.push_back(U); }
> + size_t Loop(size_t NumIterations);
> + void ShuffleAndMinimize();
> + size_t CorpusSize() const { return Corpus.size(); }
> + void ReadDir(const std::string &Path) {
> + ReadDirToVectorOfUnits(Path.c_str(), &Corpus);
> + }
> +
> + static void AlarmCallback();
> +
> + private:
> + size_t MutateAndTestOne(Unit *U);
> + size_t RunOne(const Unit &U);
> + void WriteToOutputCorpus(const Unit &U);
> + static void WriteToCrash(const Unit &U, const char *Prefix);
> +
> + void SetDeathCallback();
> + static void DeathCallback();
> + static Unit CurrentUnit;
> +
> + size_t TotalNumberOfRuns = 0;
> +
> + std::vector<Unit> Corpus;
> + FuzzingOptions Options;
> + system_clock::time_point ProcessStartTime = system_clock::now();
> + static system_clock::time_point UnitStartTime;
> +};
> +
> +}; // namespace fuzzer
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,161 @@
> +//===- 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
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerMain.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMain.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerMain.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerMain.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,143 @@
> +//===- FuzzerMain.cpp - main() function and flags -------------------------===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// main() and flags.
> +//===----------------------------------------------------------------------===//
> +
> +#include "FuzzerInternal.h"
> +
> +#include <climits>
> +#include <cstring>
> +#include <unistd.h>
> +#include <iostream>
> +
> +// ASAN options:
> +// * don't dump the coverage to disk.
> +extern "C" const char* __asan_default_options() { return "coverage_pcs=0"; }
> +
> +// Program arguments.
> +struct FlagDescription {
> + const char *Name;
> + const char *Description;
> + int Default;
> + int *Flag;
> +};
> +
> +struct {
> +#define FUZZER_FLAG(Type, Name, Default, Description) Type Name;
> +#include "FuzzerFlags.def"
> +#undef FUZZER_FLAG
> +} Flags;
> +
> +static FlagDescription FlagDescriptions [] {
> +#define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},
> +#include "FuzzerFlags.def"
> +#undef FUZZER_FLAG
> +};
> +
> +static const size_t kNumFlags =
> + sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
> +
> +static std::vector<std::string> inputs;
> +static const char *ProgName;
> +
> +static void PrintHelp() {
> + std::cerr << "Usage: " << ProgName
> + << " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";
> + std::cerr << "\nFlags: (strictly in form -flag=value)\n";
> + size_t MaxFlagLen = 0;
> + for (size_t F = 0; F < kNumFlags; F++)
> + MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
> +
> + for (size_t F = 0; F < kNumFlags; F++) {
> + const auto &D = FlagDescriptions[F];
> + std::cerr << " " << D.Name;
> + for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
> + std::cerr << " ";
> + std::cerr << "\t";
> + std::cerr << D.Default << "\t" << D.Description << "\n";
> + }
> +}
> +
> +static const char *FlagValue(const char *Param, const char *Name) {
> + size_t Len = strlen(Name);
> + if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
> + Param[Len + 1] == '=')
> + return &Param[Len + 2];
> + return nullptr;
> +}
> +
> +static bool ParseOneFlag(const char *Param) {
> + if (Param[0] != '-') return false;
> + for (size_t F = 0; F < kNumFlags; F++) {
> + const char *Name = FlagDescriptions[F].Name;
> + const char *Str = FlagValue(Param, Name);
> + if (Str) {
> + int Val = std::stol(Str);
> + *FlagDescriptions[F].Flag = Val;
> + if (Flags.verbosity >= 2)
> + std::cerr << "Flag: " << Name << " " << Val << "\n";
> + return true;
> + }
> + }
> + PrintHelp();
> + exit(1);
> +}
> +
> +// We don't use any library to minimize dependencies.
> +static void ParseFlags(int argc, char **argv) {
> + for (size_t F = 0; F < kNumFlags; F++)
> + *FlagDescriptions[F].Flag = FlagDescriptions[F].Default;
> + for (int A = 1; A < argc; A++) {
> + if (ParseOneFlag(argv[A])) continue;
> + inputs.push_back(argv[A]);
> + }
> +}
> +
> +int main(int argc, char **argv) {
> + using namespace fuzzer;
> +
> + ProgName = argv[0];
> + ParseFlags(argc, argv);
> + if (Flags.help) {
> + PrintHelp();
> + return 0;
> + }
> + Fuzzer::FuzzingOptions Options;
> + Options.Verbosity = Flags.verbosity;
> + Options.MaxLen = Flags.max_len;
> + Options.DoCrossOver = Flags.cross_over;
> + Options.MutateDepth = Flags.mutate_depth;
> + Options.ExitOnFirst = Flags.exit_on_first;
> + if (!inputs.empty())
> + Options.OutputCorpus = inputs[0];
> + Fuzzer F(Options);
> +
> + unsigned seed = Flags.seed;
> + // Initialize seed.
> + if (seed == 0)
> + seed = time(0) * 10000 + getpid();
> + if (Flags.verbosity)
> + std::cerr << "Seed: " << seed << "\n";
> + srand(seed);
> +
> + // Timer
> + if (Flags.timeout > 0)
> + SetTimer(Flags.timeout);
> +
> + for (auto &inp : inputs)
> + F.ReadDir(inp);
> +
> + if (F.CorpusSize() == 0)
> + F.AddToCorpus(Unit()); // Can't fuzz empty corpus, so add an empty input.
> + F.ShuffleAndMinimize();
> + F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);
> + if (Flags.verbosity)
> + std::cerr << "Done\n";
> + return 1;
> +}
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,62 @@
> +//===- FuzzerMutate.cpp - Mutate a test input -----------------------------===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// Mutate a test input.
> +//===----------------------------------------------------------------------===//
> +
> +#include "FuzzerInternal.h"
> +
> +namespace fuzzer {
> +
> +static char FlipRandomBit(char X) {
> + int Bit = rand() % 8;
> + char Mask = 1 << Bit;
> + char R;
> + if (X & (1 << Bit))
> + R = X & ~Mask;
> + else
> + R = X | Mask;
> + assert(R != X);
> + return R;
> +}
> +
> +static char RandCh() {
> + if (rand() % 2) return rand();
> + const char *Special = "!*'();:@&=+$,/?%#[]123ABCxyz-`~.";
> + return Special[rand() % (sizeof(Special) - 1)];
> +}
> +
> +void Mutate(Unit *U, size_t MaxLen) {
> + assert(MaxLen > 0);
> + assert(U->size() <= MaxLen);
> + switch (rand() % 3) {
> + case 0:
> + if (U->size())
> + U->erase(U->begin() + rand() % U->size());
> + break;
> + case 1:
> + if (U->empty()) {
> + U->push_back(RandCh());
> + } else if (U->size() < MaxLen) {
> + U->insert(U->begin() + rand() % U->size(), RandCh());
> + } else { // At MaxLen.
> + uint8_t Ch = RandCh();
> + size_t Idx = rand() % U->size();
> + (*U)[Idx] = Ch;
> + }
> + break;
> + default:
> + if (!U->empty()) {
> + size_t idx = rand() % U->size();
> + (*U)[idx] = FlipRandomBit((*U)[idx]);
> + }
> + break;
> + }
> +}
> +
> +} // namespace fuzzer
>
> Added: llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,61 @@
> +//===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===----------------------------------------------------------------------===//
> +// Misc utils.
> +//===----------------------------------------------------------------------===//
> +
> +#include "FuzzerInternal.h"
> +#include <iostream>
> +#include <sys/time.h>
> +#include <cassert>
> +#include <cstring>
> +#include <signal.h>
> +
> +namespace fuzzer {
> +
> +void Print(const Unit &v, const char *PrintAfter) {
> + std::cerr << v.size() << ": ";
> + for (auto x : v)
> + std::cerr << (unsigned) x << " ";
> + std::cerr << PrintAfter;
> +}
> +
> +void PrintASCII(const Unit &U, const char *PrintAfter) {
> + for (auto X : U)
> + std::cerr << (char)((isascii(X) && X >= ' ') ? X : '?');
> + std::cerr << PrintAfter;
> +}
> +
> +std::string Hash(const Unit &in) {
> + size_t h1 = 0, h2 = 0;
> + for (auto x : in) {
> + h1 += x;
> + h1 *= 5;
> + h2 += x;
> + h2 *= 7;
> + }
> + return std::to_string(h1) + std::to_string(h2);
> +}
> +
> +static void AlarmHandler(int, siginfo_t *, void *) {
> + Fuzzer::AlarmCallback();
> +}
> +
> +void SetTimer(int Seconds) {
> + struct itimerval T {{Seconds, 0}, {Seconds, 0}};
> + std::cerr << "SetTimer " << Seconds << "\n";
> + int Res = setitimer(ITIMER_REAL, &T, nullptr);
> + assert(Res == 0);
> + struct sigaction sigact;
> + memset(&sigact, 0, sizeof(sigact));
> + sigact.sa_sigaction = AlarmHandler;
> + Res = sigaction(SIGALRM, &sigact, 0);
> + assert(Res == 0);
> +}
> +
> +} // namespace fuzzer
>
> Added: llvm/trunk/lib/Fuzzer/README.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/README.txt?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/README.txt (added)
> +++ llvm/trunk/lib/Fuzzer/README.txt Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,56 @@
> +===============================
> +Fuzzer -- a library for coverage-guided fuzz testing.
> +===============================
> +
> +This library is intended primarily for in-process coverage-guided fuzz testing
> +(fuzzing) of other libraries. The typical workflow looks like this:
> +
> + * Build the Fuzzer library as a static archive (or just a set of .o files).
> + Note that the Fuzzer contains the main() function.
> + Preferably do *not* use sanitizers while building the Fuzzer.
> + * Build the library you are going to test with -fsanitize-coverage=[234]
> + and one of the sanitizers. We recommend to build the library in several
> + different modes (e.g. asan, msan, lsan, ubsan, etc) and even using different
> + optimizations options (e.g. -O0, -O1, -O2) to diversify testing.
> + * Build a test driver using the same options as the library.
> + The test driver is a C/C++ file containing interesting calls to the library
> + inside a single function:
> + extern "C" void TestOneInput(const uint8_t *Data, size_t Size);
> + * Link the Fuzzer, the library and the driver together into an executable
> + using the same sanitizer options as for the library.
> + * Collect the initial corpus of inputs for the
> + fuzzer (a directory with test inputs, one file per input).
> + The better your inputs are the faster you will find something interesting.
> + Also try to keep your inputs small, otherwise the Fuzzer will run too slow.
> + * Run the fuzzer with the test corpus. As new interesting test cases are
> + discovered they will be added to the corpus. If a bug is discovered by
> + the sanitizer (asan, etc) it will be reported as usual and the reproducer
> + will be written to disk.
> + Each Fuzzer process is single-threaded (unless the library starts its own
> + threads). You can run the Fuzzer on the same corpus in multiple processes.
> + in parallel. For run-time options run the Fuzzer binary with '-help=1'.
> +
> +
> +The Fuzzer is similar in concept to AFL (http://lcamtuf.coredump.cx/afl/),
> +but uses in-process Fuzzing, which is more fragile, more restrictive, but
> +potentially much faster as it has no overhead for process start-up.
> +It uses LLVM's "Sanitizer Coverage" instrumentation to get in-process
> +coverage-feedback https://code.google.com/p/address-sanitizer/wiki/AsanCoverage
> +
> +The code resides in the LLVM repository and is (or will be) used by various
> +parts of LLVM, but the Fuzzer itself does not (and should not) depend on any
> +part of LLVM and can be used for other projects. Ideally, the Fuzzer's code
> +should not have any external dependencies. Right now it uses STL, which may need
> +to be fixed later.
> +
> +Examples of usage in LLVM:
> + * clang-format-fuzzer. The inputs are random pieces of C++-like text.
> + * TODO: add more
> +
> +Toy example (see SimpleTest.cpp):
> +a simple function that does something interesting if it receives bytes "Hi!".
> + # Build the Fuzzer with asan:
> + % clang++ -std=c++11 -fsanitize=address -fsanitize-coverage=3 -O1 -g \
> + Fuzzer*.cpp test/SimpleTest.cpp
> + # Run the fuzzer with no corpus (assuming on empty input)
> + % ./a.out
>
> Added: llvm/trunk/lib/Fuzzer/test/ExactTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/ExactTest.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/ExactTest.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/ExactTest.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,21 @@
> +// Simple test for a fuzzer. The fuzzer must find the string "FUZZER".
> +#include <cstdlib>
> +#include <cstddef>
> +#include <iostream>
> +
> +static volatile int Sink;
> +
> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {
> + int bits = 0;
> + if (Size > 0 && Data[0] == 'F') bits |= 1;
> + if (Size > 1 && Data[1] == 'U') bits |= 2;
> + if (Size > 2 && Data[2] == 'Z') bits |= 4;
> + if (Size > 3 && Data[3] == 'Z') bits |= 8;
> + if (Size > 4 && Data[4] == 'E') bits |= 16;
> + if (Size > 5 && Data[5] == 'R') bits |= 32;
> + if (bits == 63) {
> + std::cerr << "BINGO!\n";
> + abort();
> + }
> +}
> +
>
> Added: llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,19 @@
> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".
> +#include <cstdlib>
> +#include <cstddef>
> +#include <iostream>
> +
> +static volatile int Sink;
> +
> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {
> + if (Size > 0 && Data[0] == 'H') {
> + Sink = 1;
> + if (Size > 1 && Data[1] == 'i') {
> + Sink = 2;
> + if (Size > 2 && Data[2] == '!') {
> + Size = 2;
> + }
> + }
> + }
> +}
> +
>
> Added: llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,21 @@
> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".
> +#include <cstdlib>
> +#include <cstddef>
> +#include <iostream>
> +
> +static volatile int Sink;
> +static volatile int *Null = 0;
> +
> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {
> + if (Size > 0 && Data[0] == 'H') {
> + Sink = 1;
> + if (Size > 1 && Data[1] == 'i') {
> + Sink = 2;
> + if (Size > 2 && Data[2] == '!') {
> + std::cout << "Found the target, dereferencing NULL\n";
> + *Null = 1;
> + }
> + }
> + }
> +}
> +
>
> Added: llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,20 @@
> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".
> +#include <cstdlib>
> +#include <cstddef>
> +#include <iostream>
> +
> +static volatile int Sink;
> +
> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {
> + if (Size > 0 && Data[0] == 'H') {
> + Sink = 1;
> + if (Size > 1 && Data[1] == 'i') {
> + Sink = 2;
> + if (Size > 2 && Data[2] == '!') {
> + std::cout << "Found the target, exiting\n";
> + exit(0);
> + }
> + }
> + }
> +}
> +
>
> Added: llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,13 @@
> +#include "FuzzerInternal.h"
> +
> +int main() {
> + using namespace fuzzer;
> + Unit A({0, 1, 2, 3, 4}), B({5, 6, 7, 8, 9});
> + Unit C;
> + for (size_t Len = 1; Len < 15; Len++) {
> + for (int Iter = 0; Iter < 1000; Iter++) {
> + CrossOver(A, B, &C, Len);
> + Print(C);
> + }
> + }
> +}
>
> Added: llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp?rev=227252&view=auto
> ==============================================================================
> --- llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp (added)
> +++ llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp Tue Jan 27 16:08:41 2015
> @@ -0,0 +1,21 @@
> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".
> +#include <cstdlib>
> +#include <cstddef>
> +#include <iostream>
> +
> +static volatile int Sink;
> +
> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {
> + if (Size > 0 && Data[0] == 'H') {
> + Sink = 1;
> + if (Size > 1 && Data[1] == 'i') {
> + Sink = 2;
> + if (Size > 2 && Data[2] == '!') {
> + Size = 2;
> + while (Sink)
> + ;
> + }
> + }
> + }
> +}
> +
>
>
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Capture.PNG
Type: image/png
Size: 32631 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20150129/d7a51558/attachment.png>
More information about the llvm-commits
mailing list