[llvm] r227252 - Add a Fuzzer library
Kostya Serebryany
kcc at google.com
Thu Jan 29 08:00:42 PST 2015
Could this have been resolved w/o reverting?
On Thu, Jan 29, 2015 at 7:53 AM, Aaron Ballman <aaron at aaronballman.com>
wrote:
> Sorry for any troubles this causes, but I have reverted in 227452 and
> 227453 as this was causing issues for too many folks. Also, there
> appear to be other build issues you will want to address before
> recommit:
> http://bb.pgr.jp/builders/msbuild-llvmclang-x64-msc17-DA/builds/1467/steps/build_llvm_all/logs/stdio
>
> ~Aaron
>
> On Thu, Jan 29, 2015 at 10:28 AM, Aaron Ballman <aaron at aaronballman.com>
> wrote:
> > Actually, this is completely broken on Windows and should be reverted
> > until it is fixed up. Comments below.
> >
> > On Thu, Jan 29, 2015 at 10:11 AM, Aaron Ballman <aaron at aaronballman.com>
> wrote:
> >> 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>
> >
> > dirent.h does not exist on Windows with MSVC.
> >
> >>> +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;
> >
> > We have filesystem APIs to do this, don't we?
> >
> >>> +}
> >>> +
> >>> +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>
> >
> > Please do not assume everyone has asan checked out. Also, this is
> > using a system include path on Windows instead of a project include
> > path.
> >
> >>> +#include <algorithm>
> >>> +#include <string>
> >>> +#include <iostream>
> >>> +#include <stdlib.h>
> >
> > Why are we including a C header instead of cstdlib?
> >
> >>> +
> >>> +// 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>
> >
> > unistd.h does not exist on Windows with MSVC.
> >
> >>> +#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>
> >
> > sys/time.h does not exist on Windows with MSVC.
> >
> >>> +#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)
> >>> + ;
> >>> + }
> >>> + }
> >>> + }
> >>> +}
> >>> +
> >
> > Aside from the obvious errors for MSVC, it does not compile cleanly:
> >
> > Warning 1 warning C4530: C++ exception handler used, but unwind
> > semantics are not enabled. Specify /EHsc
> > (E:\llvm\llvm\lib\Fuzzer\FuzzerLoop.cpp) D:\Program Files Warning 5
> > warning C4305: 'initializing' : truncation from 'int' to 'bool'
> > (E:\llvm\llvm\lib\Fuzzer\FuzzerIO.cpp)
> > e:\llvm\llvm\lib\fuzzer\FuzzerInternal.h 44
> > Warning 13 warning C4530: C++ exception handler used, but unwind
> > semantics are not enabled. Specify /EHsc D:\Program Files
> > (x86)\Microsoft Visual Studio
> >
> > (And some variation of these repeat dozens of times.)
> >
> > ~Aaron
> >
> >>>
> >>>
> >>> _______________________________________________
> >>> llvm-commits mailing list
> >>> llvm-commits at cs.uiuc.edu
> >>> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
>
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