[llvm] r227252 - Add a Fuzzer library
Aaron Ballman
aaron at aaronballman.com
Thu Jan 29 08:18:54 PST 2015
On Thu, Jan 29, 2015 at 11:11 AM, Kostya Serebryany <kcc at google.com> wrote:
>
>
> On Thu, Jan 29, 2015 at 7:28 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?
>>
>
> As the README.txt explains, this library can not use any of the great LLVM
> support.
> It has to remain independent. I amy even have to remove the use of STL from
> it later.
>
>>
>> >> +}
>> >> +
>> >> +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.
>
>
>
> I do not. This is what EXCLUDE_FROM_ALL was for.
> Apparently it did not help.
> Suggestions?
I'm not certain how EXCLUDE_FROM_ALL would help for this #include?
>>
>>
>> >> +#include <algorithm>
>> >> +#include <string>
>> >> +#include <iostream>
>> >> +#include <stdlib.h>
>>
>> Why are we including a C header instead of cstdlib?
>>
> mistake, will fix.
>
>>
>> >> +
>> >> +// 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.
>>
>
> This is not expected to work on windows at this stage.
Hugo (CCed) mentioned on IRC that he would take a look into disabling
this for Windows entirely within CMake.
~Aaron
>
>>
>> >> +#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.
>>
> ditto
>>
>> >> +#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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