<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Jan 29, 2015 at 7:28 AM, Aaron Ballman <span dir="ltr"><<a href="mailto:aaron@aaronballman.com" target="_blank">aaron@aaronballman.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Actually, this is completely broken on Windows and should be reverted<br>
until it is fixed up. Comments below.<br></blockquote><div><br></div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div><div class="h5"><br>
On Thu, Jan 29, 2015 at 10:11 AM, Aaron Ballman <<a href="mailto:aaron@aaronballman.com">aaron@aaronballman.com</a>> wrote:<br>
> This commit puts the fuzzer targets on the top-level for MSVC<br>
> solutions when they should be in a separate folder instead. Picture<br>
> attached is worth 1000 words. ;-)<br>
><br>
> ~Aaron<br>
><br>
> On Tue, Jan 27, 2015 at 5:08 PM, Kostya Serebryany <<a href="mailto:kcc@google.com">kcc@google.com</a>> wrote:<br>
>> Author: kcc<br>
>> Date: Tue Jan 27 16:08:41 2015<br>
>> New Revision: 227252<br>
>><br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project?rev=227252&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=227252&view=rev</a><br>
>> Log:<br>
>> Add a Fuzzer library<br>
>><br>
>> Summary:<br>
>> A simple genetic in-process coverage-guided fuzz testing library.<br>
>><br>
>> I've used this fuzzer to test clang-format<br>
>> (it found 12+ bugs, thanks djasper@ for the fixes!)<br>
>> and it may also help us test other parts of LLVM.<br>
>> So why not keep it in the LLVM repository?<br>
>><br>
>> I plan to add the cmake build rules later (in a separate patch, if that's ok)<br>
>> and also add a clang-format-fuzzer target.<br>
>><br>
>> See README.txt for details.<br>
>><br>
>> Test Plan: Tests will follow separately.<br>
>><br>
>> Reviewers: djasper, chandlerc, rnk<br>
>><br>
>> Reviewed By: rnk<br>
>><br>
>> Subscribers: majnemer, ygribov, dblaikie, llvm-commits<br>
>><br>
>> Differential Revision: <a href="http://reviews.llvm.org/D7184" target="_blank">http://reviews.llvm.org/D7184</a><br>
>><br>
>> Added:<br>
>> llvm/trunk/lib/Fuzzer/<br>
>> llvm/trunk/lib/Fuzzer/CMakeLists.txt<br>
>> llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp<br>
>> llvm/trunk/lib/Fuzzer/FuzzerFlags.def<br>
>> llvm/trunk/lib/Fuzzer/FuzzerIO.cpp<br>
>> llvm/trunk/lib/Fuzzer/FuzzerInternal.h<br>
>> llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp<br>
>> llvm/trunk/lib/Fuzzer/FuzzerMain.cpp<br>
>> llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp<br>
>> llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp<br>
>> llvm/trunk/lib/Fuzzer/README.txt<br>
>> llvm/trunk/lib/Fuzzer/test/<br>
>> llvm/trunk/lib/Fuzzer/test/ExactTest.cpp<br>
>> llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp<br>
>> llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp<br>
>> llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp<br>
>> llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp<br>
>> llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp<br>
>> Modified:<br>
>> llvm/trunk/lib/CMakeLists.txt<br>
>><br>
>> Modified: llvm/trunk/lib/CMakeLists.txt<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CMakeLists.txt?rev=227252&r1=227251&r2=227252&view=diff" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CMakeLists.txt?rev=227252&r1=227251&r2=227252&view=diff</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/CMakeLists.txt (original)<br>
>> +++ llvm/trunk/lib/CMakeLists.txt Tue Jan 27 16:08:41 2015<br>
>> @@ -17,3 +17,4 @@ add_subdirectory(Target)<br>
>> add_subdirectory(AsmParser)<br>
>> add_subdirectory(LineEditor)<br>
>> add_subdirectory(ProfileData)<br>
>> +add_subdirectory(Fuzzer)<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/CMakeLists.txt<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/CMakeLists.txt?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/CMakeLists.txt?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/CMakeLists.txt (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/CMakeLists.txt Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,9 @@<br>
>> +add_library(LLVMFuzzer STATIC<br>
>> + EXCLUDE_FROM_ALL # Do not build if you are not building fuzzers.<br>
>> + FuzzerCrossOver.cpp<br>
>> + FuzzerIO.cpp<br>
>> + FuzzerLoop.cpp<br>
>> + FuzzerMain.cpp<br>
>> + FuzzerMutate.cpp<br>
>> + FuzzerUtil.cpp<br>
>> + )<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerCrossOver.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,46 @@<br>
>> +//===- FuzzerCrossOver.cpp - Cross over two test inputs -------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Cross over test inputs.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +<br>
>> +#include "FuzzerInternal.h"<br>
>> +<br>
>> +namespace fuzzer {<br>
>> +<br>
>> +// Cross A and B, store the result (ap to MaxLen bytes) in U.<br>
>> +void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen) {<br>
>> + size_t Size = rand() % MaxLen + 1;<br>
>> + U->clear();<br>
>> + const Unit *V = &A;<br>
>> + size_t PosA = 0;<br>
>> + size_t PosB = 0;<br>
>> + size_t *Pos = &PosA;<br>
>> + while (U->size() < Size && (PosA < A.size() || PosB < B.size())) {<br>
>> + // Merge a part of V into U.<br>
>> + size_t SizeLeftU = Size - U->size();<br>
>> + if (*Pos < V->size()) {<br>
>> + size_t SizeLeftV = V->size() - *Pos;<br>
>> + size_t MaxExtraSize = std::min(SizeLeftU, SizeLeftV);<br>
>> + size_t ExtraSize = rand() % MaxExtraSize + 1;<br>
>> + U->insert(U->end(), V->begin() + *Pos, V->begin() + *Pos + ExtraSize);<br>
>> + (*Pos) += ExtraSize;<br>
>> + }<br>
>> +<br>
>> + // Use the other Unit on the next iteration.<br>
>> + if (Pos == &PosA) {<br>
>> + Pos = &PosB;<br>
>> + V = &B;<br>
>> + } else {<br>
>> + Pos = &PosA;<br>
>> + V = &A;<br>
>> + }<br>
>> + }<br>
>> +}<br>
>> +<br>
>> +} // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerFlags.def<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerFlags.def?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerFlags.def?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerFlags.def (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerFlags.def Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,24 @@<br>
>> +//===- FuzzerFlags.def - Run-time flags -------------------------*- C++ -* ===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Flags. FUZZER_FLAG macro should be defined at the point of inclusion.<br>
>> +// We are not using any flag parsing library for better portability and<br>
>> +// independence.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +FUZZER_FLAG(int, verbosity, 1, "Verbosity level.")<br>
>> +FUZZER_FLAG(int, seed, 0, "Random seed. If 0, seed is generated.")<br>
>> +FUZZER_FLAG(int, iterations, -1,<br>
>> + "Number of iterations of the fuzzer (-1 for infinite runs).")<br>
>> +FUZZER_FLAG(int, max_len, 64, "Maximal length of the test input.")<br>
>> +FUZZER_FLAG(int, cross_over, 1, "If 1, cross over inputs.")<br>
>> +FUZZER_FLAG(int, mutate_depth, 10,<br>
>> + "Apply this number of consecutive mutations to each input.")<br>
>> +FUZZER_FLAG(int, exit_on_first, 0,<br>
>> + "If 1, exit after the first new interesting input is found.")<br>
>> +FUZZER_FLAG(int, timeout, -1, "Timeout in seconds (if positive).")<br>
>> +FUZZER_FLAG(int, help, 0, "Print help.")<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerIO.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerIO.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerIO.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerIO.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerIO.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,44 @@<br>
>> +//===- FuzzerIO.cpp - IO utils. -------------------------------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// IO functions.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +#include "FuzzerInternal.h"<br>
>> +#include <fstream><br>
>> +#include <dirent.h><br>
<br>
</div></div>dirent.h does not exist on Windows with MSVC.<br>
<span class=""><br>
>> +namespace fuzzer {<br>
>> +<br>
>> +std::vector<std::string> ListFilesInDir(const std::string &Dir) {<br>
>> + std::vector<std::string> V;<br>
>> + DIR *D = opendir(Dir.c_str());<br>
>> + if (!D) return V;<br>
>> + while (auto E = readdir(D)) {<br>
>> + if (E->d_type == DT_REG || E->d_type == DT_LNK)<br>
>> + V.push_back(E->d_name);<br>
>> + }<br>
>> + closedir(D);<br>
>> + return V;<br>
<br>
</span>We have filesystem APIs to do this, don't we?<br>
<div><div class="h5"><br></div></div></blockquote><div><br></div><div>As the README.txt explains, this library can not use any of the great LLVM support. </div><div>It has to remain independent. I amy even have to remove the use of STL from it later. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5">
>> +}<br>
>> +<br>
>> +Unit FileToVector(const std::string &Path) {<br>
>> + std::ifstream T(Path);<br>
>> + return Unit((std::istreambuf_iterator<char>(T)),<br>
>> + std::istreambuf_iterator<char>());<br>
>> +}<br>
>> +<br>
>> +void WriteToFile(const Unit &U, const std::string &Path) {<br>
>> + std::ofstream OF(Path);<br>
>> + OF.write((const char*)U.data(), U.size());<br>
>> +}<br>
>> +<br>
>> +void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V) {<br>
>> + for (auto &X : ListFilesInDir(Path))<br>
>> + V->push_back(FileToVector(std::string(Path) + "/" + X));<br>
>> +}<br>
>> +<br>
>> +} // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerInternal.h<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerInternal.h?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerInternal.h?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerInternal.h (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerInternal.h Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,77 @@<br>
>> +//===- FuzzerInternal.h - Internal header for the Fuzzer --------*- C++ -* ===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Define the main class fuzzer::Fuzzer and most functions.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +#include <cassert><br>
>> +#include <chrono><br>
>> +#include <cstddef><br>
>> +#include <cstdlib><br>
>> +#include <string><br>
>> +#include <vector><br>
>> +<br>
>> +namespace fuzzer {<br>
>> +typedef std::vector<uint8_t> Unit;<br>
>> +using namespace std::chrono;<br>
>> +<br>
>> +Unit ReadFile(const char *Path);<br>
>> +std::vector<std::string> ListFilesInDir(const std::string &Dir);<br>
>> +void ReadDirToVectorOfUnits(const char *Path, std::vector<Unit> *V);<br>
>> +void WriteToFile(const Unit &U, const std::string &Path);<br>
>> +<br>
>> +void Mutate(Unit *U, size_t MaxLen);<br>
>> +<br>
>> +void CrossOver(const Unit &A, const Unit &B, Unit *U, size_t MaxLen);<br>
>> +<br>
>> +void Print(const Unit &U, const char *PrintAfter = "");<br>
>> +void PrintASCII(const Unit &U, const char *PrintAfter = "");<br>
>> +std::string Hash(const Unit &U);<br>
>> +void SetTimer(int Seconds);<br>
>> +<br>
>> +class Fuzzer {<br>
>> + public:<br>
>> + struct FuzzingOptions {<br>
>> + int Verbosity = 1;<br>
>> + int MaxLen = 0;<br>
>> + bool DoCrossOver = true;<br>
>> + bool MutateDepth = 10;<br>
>> + bool ExitOnFirst = false;<br>
>> + std::string OutputCorpus;<br>
>> + };<br>
>> + Fuzzer(FuzzingOptions Options) : Options(Options) {<br>
>> + SetDeathCallback();<br>
>> + }<br>
>> + void AddToCorpus(const Unit &U) { Corpus.push_back(U); }<br>
>> + size_t Loop(size_t NumIterations);<br>
>> + void ShuffleAndMinimize();<br>
>> + size_t CorpusSize() const { return Corpus.size(); }<br>
>> + void ReadDir(const std::string &Path) {<br>
>> + ReadDirToVectorOfUnits(Path.c_str(), &Corpus);<br>
>> + }<br>
>> +<br>
>> + static void AlarmCallback();<br>
>> +<br>
>> + private:<br>
>> + size_t MutateAndTestOne(Unit *U);<br>
>> + size_t RunOne(const Unit &U);<br>
>> + void WriteToOutputCorpus(const Unit &U);<br>
>> + static void WriteToCrash(const Unit &U, const char *Prefix);<br>
>> +<br>
>> + void SetDeathCallback();<br>
>> + static void DeathCallback();<br>
>> + static Unit CurrentUnit;<br>
>> +<br>
>> + size_t TotalNumberOfRuns = 0;<br>
>> +<br>
>> + std::vector<Unit> Corpus;<br>
>> + FuzzingOptions Options;<br>
>> + system_clock::time_point ProcessStartTime = system_clock::now();<br>
>> + static system_clock::time_point UnitStartTime;<br>
>> +};<br>
>> +<br>
>> +}; // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerLoop.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,161 @@<br>
>> +//===- FuzzerLoop.cpp - Fuzzer's main loop --------------------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Fuzzer's main loop.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +<br>
>> +#include "FuzzerInternal.h"<br>
>> +#include <sanitizer/asan_interface.h><br>
<br>
</div></div>Please do not assume everyone has asan checked out. Also, this is<br>
using a system include path on Windows instead of a project include<br>
path.<br></blockquote><div><br></div><div><br></div><div>I do not. This is what <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;font-style:normal;font-variant:normal;font-weight:normal;letter-spacing:normal;line-height:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:none;display:inline!important;background-color:rgb(255,255,255)">EXCLUDE_FROM_ALL was for. </span></div><div>Apparently it did not help. </div><div>Suggestions? </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<span class=""><br>
>> +#include <algorithm><br>
>> +#include <string><br>
>> +#include <iostream><br>
>> +#include <stdlib.h><br>
<br>
</span>Why are we including a C header instead of cstdlib?<br>
<div><div class="h5"><br></div></div></blockquote><div>mistake, will fix. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5">
>> +<br>
>> +// This function should be defined by the user.<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size);<br>
>> +<br>
>> +namespace fuzzer {<br>
>> +<br>
>> +// static<br>
>> +Unit Fuzzer::CurrentUnit;<br>
>> +system_clock::time_point Fuzzer::UnitStartTime;<br>
>> +<br>
>> +void Fuzzer::SetDeathCallback() {<br>
>> + __sanitizer_set_death_callback(DeathCallback);<br>
>> +}<br>
>> +<br>
>> +void Fuzzer::DeathCallback() {<br>
>> + std::cerr << "DEATH: " << std::endl;<br>
>> + Print(CurrentUnit, "\n");<br>
>> + PrintASCII(CurrentUnit, "\n");<br>
>> + WriteToCrash(CurrentUnit, "crash-");<br>
>> +}<br>
>> +<br>
>> +void Fuzzer::AlarmCallback() {<br>
>> + size_t Seconds =<br>
>> + duration_cast<seconds>(system_clock::now() - UnitStartTime).count();<br>
>> + std::cerr << "ALARM: working on the last Unit for " << Seconds << " seconds"<br>
>> + << std::endl;<br>
>> + if (Seconds > 60) {<br>
>> + Print(CurrentUnit, "\n");<br>
>> + PrintASCII(CurrentUnit, "\n");<br>
>> + WriteToCrash(CurrentUnit, "timeout-");<br>
>> + }<br>
>> + abort();<br>
>> +}<br>
>> +<br>
>> +void Fuzzer::ShuffleAndMinimize() {<br>
>> + if (Options.Verbosity)<br>
>> + std::cerr << "Shuffle: " << Corpus.size() << "\n";<br>
>> + std::vector<Unit> NewCorpus;<br>
>> + random_shuffle(Corpus.begin(), Corpus.end());<br>
>> + size_t MaxCov = 0;<br>
>> + Unit &U = CurrentUnit;<br>
>> + for (const auto &C : Corpus) {<br>
>> + for (size_t First = 0; First < 1; First++) {<br>
>> + U.clear();<br>
>> + size_t Last = std::min(First + Options.MaxLen, C.size());<br>
>> + U.insert(U.begin(), C.begin() + First, C.begin() + Last);<br>
>> + size_t NewCoverage = RunOne(U);<br>
>> + if (NewCoverage) {<br>
>> + MaxCov = NewCoverage;<br>
>> + NewCorpus.push_back(U);<br>
>> + if (Options.Verbosity >= 2)<br>
>> + std::cerr << "NEW0: " << NewCoverage << "\n";<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> + Corpus = NewCorpus;<br>
>> + if (Options.Verbosity)<br>
>> + std::cerr << "Shuffle done: " << Corpus.size() << " IC: " << MaxCov << "\n";<br>
>> +}<br>
>> +<br>
>> +size_t Fuzzer::RunOne(const Unit &U) {<br>
>> + UnitStartTime = system_clock::now();<br>
>> + TotalNumberOfRuns++;<br>
>> + size_t OldCoverage = __sanitizer_get_total_unique_coverage();<br>
>> + TestOneInput(U.data(), U.size());<br>
>> + size_t NewCoverage = __sanitizer_get_total_unique_coverage();<br>
>> + if (!(TotalNumberOfRuns & (TotalNumberOfRuns - 1)) && Options.Verbosity) {<br>
>> + size_t Seconds =<br>
>> + duration_cast<seconds>(system_clock::now() - ProcessStartTime).count();<br>
>> + std::cerr<br>
>> + << "#" << TotalNumberOfRuns<br>
>> + << "\tcov: " << NewCoverage<br>
>> + << "\texec/s: " << (Seconds ? TotalNumberOfRuns / Seconds : 0) << "\n";<br>
>> + }<br>
>> + if (NewCoverage > OldCoverage)<br>
>> + return NewCoverage;<br>
>> + return 0;<br>
>> +}<br>
>> +<br>
>> +void Fuzzer::WriteToOutputCorpus(const Unit &U) {<br>
>> + if (Options.OutputCorpus.empty()) return;<br>
>> + std::string Path = Options.OutputCorpus + "/" + Hash(U);<br>
>> + WriteToFile(U, Path);<br>
>> + if (Options.Verbosity >= 2)<br>
>> + std::cerr << "Written to " << Path << std::endl;<br>
>> +}<br>
>> +<br>
>> +void Fuzzer::WriteToCrash(const Unit &U, const char *Prefix) {<br>
>> + std::string Path = Prefix + Hash(U);<br>
>> + WriteToFile(U, Path);<br>
>> + std::cerr << "CRASHED; file written to " << Path << std::endl;<br>
>> +}<br>
>> +<br>
>> +size_t Fuzzer::MutateAndTestOne(Unit *U) {<br>
>> + size_t NewUnits = 0;<br>
>> + for (size_t i = 0; i < Options.MutateDepth; i++) {<br>
>> + Mutate(U, Options.MaxLen);<br>
>> + if (U->empty()) continue;<br>
>> + size_t NewCoverage = RunOne(*U);<br>
>> + if (NewCoverage) {<br>
>> + Corpus.push_back(*U);<br>
>> + NewUnits++;<br>
>> + if (Options.Verbosity) {<br>
>> + std::cerr << "#" << TotalNumberOfRuns<br>
>> + << "\tNEW: " << NewCoverage<br>
>> + << " L: " << U->size()<br>
>> + << "\t";<br>
>> + if (U->size() < 30) {<br>
>> + PrintASCII(*U);<br>
>> + std::cerr << "\t";<br>
>> + Print(*U);<br>
>> + }<br>
>> + std::cerr << "\n";<br>
>> + }<br>
>> + WriteToOutputCorpus(*U);<br>
>> + if (Options.ExitOnFirst)<br>
>> + exit(0);<br>
>> + }<br>
>> + }<br>
>> + return NewUnits;<br>
>> +}<br>
>> +<br>
>> +size_t Fuzzer::Loop(size_t NumIterations) {<br>
>> + size_t NewUnits = 0;<br>
>> + for (size_t i = 1; i <= NumIterations; i++) {<br>
>> + if (Options.DoCrossOver) {<br>
>> + for (size_t J1 = 0; J1 < Corpus.size(); J1++) {<br>
>> + for (size_t J2 = 0; J2 < Corpus.size(); J2++) {<br>
>> + CurrentUnit.clear();<br>
>> + CrossOver(Corpus[J1], Corpus[J2], &CurrentUnit, Options.MaxLen);<br>
>> + NewUnits += MutateAndTestOne(&CurrentUnit);<br>
>> + }<br>
>> + }<br>
>> + } else { // No CrossOver<br>
>> + for (size_t J = 0; J < Corpus.size(); J++) {<br>
>> + CurrentUnit = Corpus[J];<br>
>> + NewUnits += MutateAndTestOne(&CurrentUnit);<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> + return NewUnits;<br>
>> +}<br>
>> +<br>
>> +} // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerMain.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMain.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMain.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerMain.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerMain.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,143 @@<br>
>> +//===- FuzzerMain.cpp - main() function and flags -------------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// main() and flags.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +<br>
>> +#include "FuzzerInternal.h"<br>
>> +<br>
>> +#include <climits><br>
>> +#include <cstring><br>
>> +#include <unistd.h><br>
<br>
</div></div>unistd.h does not exist on Windows with MSVC.<br>
<div><div class="h5"><br></div></div></blockquote><div><br></div><div>This is not expected to work on windows at this stage. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5">
>> +#include <iostream><br>
>> +<br>
>> +// ASAN options:<br>
>> +// * don't dump the coverage to disk.<br>
>> +extern "C" const char* __asan_default_options() { return "coverage_pcs=0"; }<br>
>> +<br>
>> +// Program arguments.<br>
>> +struct FlagDescription {<br>
>> + const char *Name;<br>
>> + const char *Description;<br>
>> + int Default;<br>
>> + int *Flag;<br>
>> +};<br>
>> +<br>
>> +struct {<br>
>> +#define FUZZER_FLAG(Type, Name, Default, Description) Type Name;<br>
>> +#include "FuzzerFlags.def"<br>
>> +#undef FUZZER_FLAG<br>
>> +} Flags;<br>
>> +<br>
>> +static FlagDescription FlagDescriptions [] {<br>
>> +#define FUZZER_FLAG(Type, Name, Default, Description) {#Name, Description, Default, &Flags.Name},<br>
>> +#include "FuzzerFlags.def"<br>
>> +#undef FUZZER_FLAG<br>
>> +};<br>
>> +<br>
>> +static const size_t kNumFlags =<br>
>> + sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);<br>
>> +<br>
>> +static std::vector<std::string> inputs;<br>
>> +static const char *ProgName;<br>
>> +<br>
>> +static void PrintHelp() {<br>
>> + std::cerr << "Usage: " << ProgName<br>
>> + << " [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n";<br>
>> + std::cerr << "\nFlags: (strictly in form -flag=value)\n";<br>
>> + size_t MaxFlagLen = 0;<br>
>> + for (size_t F = 0; F < kNumFlags; F++)<br>
>> + MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);<br>
>> +<br>
>> + for (size_t F = 0; F < kNumFlags; F++) {<br>
>> + const auto &D = FlagDescriptions[F];<br>
>> + std::cerr << " " << D.Name;<br>
>> + for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)<br>
>> + std::cerr << " ";<br>
>> + std::cerr << "\t";<br>
>> + std::cerr << D.Default << "\t" << D.Description << "\n";<br>
>> + }<br>
>> +}<br>
>> +<br>
>> +static const char *FlagValue(const char *Param, const char *Name) {<br>
>> + size_t Len = strlen(Name);<br>
>> + if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&<br>
>> + Param[Len + 1] == '=')<br>
>> + return &Param[Len + 2];<br>
>> + return nullptr;<br>
>> +}<br>
>> +<br>
>> +static bool ParseOneFlag(const char *Param) {<br>
>> + if (Param[0] != '-') return false;<br>
>> + for (size_t F = 0; F < kNumFlags; F++) {<br>
>> + const char *Name = FlagDescriptions[F].Name;<br>
>> + const char *Str = FlagValue(Param, Name);<br>
>> + if (Str) {<br>
>> + int Val = std::stol(Str);<br>
>> + *FlagDescriptions[F].Flag = Val;<br>
>> + if (Flags.verbosity >= 2)<br>
>> + std::cerr << "Flag: " << Name << " " << Val << "\n";<br>
>> + return true;<br>
>> + }<br>
>> + }<br>
>> + PrintHelp();<br>
>> + exit(1);<br>
>> +}<br>
>> +<br>
>> +// We don't use any library to minimize dependencies.<br>
>> +static void ParseFlags(int argc, char **argv) {<br>
>> + for (size_t F = 0; F < kNumFlags; F++)<br>
>> + *FlagDescriptions[F].Flag = FlagDescriptions[F].Default;<br>
>> + for (int A = 1; A < argc; A++) {<br>
>> + if (ParseOneFlag(argv[A])) continue;<br>
>> + inputs.push_back(argv[A]);<br>
>> + }<br>
>> +}<br>
>> +<br>
>> +int main(int argc, char **argv) {<br>
>> + using namespace fuzzer;<br>
>> +<br>
>> + ProgName = argv[0];<br>
>> + ParseFlags(argc, argv);<br>
>> + if (Flags.help) {<br>
>> + PrintHelp();<br>
>> + return 0;<br>
>> + }<br>
>> + Fuzzer::FuzzingOptions Options;<br>
>> + Options.Verbosity = Flags.verbosity;<br>
>> + Options.MaxLen = Flags.max_len;<br>
>> + Options.DoCrossOver = Flags.cross_over;<br>
>> + Options.MutateDepth = Flags.mutate_depth;<br>
>> + Options.ExitOnFirst = Flags.exit_on_first;<br>
>> + if (!inputs.empty())<br>
>> + Options.OutputCorpus = inputs[0];<br>
>> + Fuzzer F(Options);<br>
>> +<br>
>> + unsigned seed = Flags.seed;<br>
>> + // Initialize seed.<br>
>> + if (seed == 0)<br>
>> + seed = time(0) * 10000 + getpid();<br>
>> + if (Flags.verbosity)<br>
>> + std::cerr << "Seed: " << seed << "\n";<br>
>> + srand(seed);<br>
>> +<br>
>> + // Timer<br>
>> + if (Flags.timeout > 0)<br>
>> + SetTimer(Flags.timeout);<br>
>> +<br>
>> + for (auto &inp : inputs)<br>
>> + F.ReadDir(inp);<br>
>> +<br>
>> + if (F.CorpusSize() == 0)<br>
>> + F.AddToCorpus(Unit()); // Can't fuzz empty corpus, so add an empty input.<br>
>> + F.ShuffleAndMinimize();<br>
>> + F.Loop(Flags.iterations < 0 ? INT_MAX : Flags.iterations);<br>
>> + if (Flags.verbosity)<br>
>> + std::cerr << "Done\n";<br>
>> + return 1;<br>
>> +}<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,62 @@<br>
>> +//===- FuzzerMutate.cpp - Mutate a test input -----------------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Mutate a test input.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +<br>
>> +#include "FuzzerInternal.h"<br>
>> +<br>
>> +namespace fuzzer {<br>
>> +<br>
>> +static char FlipRandomBit(char X) {<br>
>> + int Bit = rand() % 8;<br>
>> + char Mask = 1 << Bit;<br>
>> + char R;<br>
>> + if (X & (1 << Bit))<br>
>> + R = X & ~Mask;<br>
>> + else<br>
>> + R = X | Mask;<br>
>> + assert(R != X);<br>
>> + return R;<br>
>> +}<br>
>> +<br>
>> +static char RandCh() {<br>
>> + if (rand() % 2) return rand();<br>
>> + const char *Special = "!*'();:@&=+$,/?%#[]123ABCxyz-`~.";<br>
>> + return Special[rand() % (sizeof(Special) - 1)];<br>
>> +}<br>
>> +<br>
>> +void Mutate(Unit *U, size_t MaxLen) {<br>
>> + assert(MaxLen > 0);<br>
>> + assert(U->size() <= MaxLen);<br>
>> + switch (rand() % 3) {<br>
>> + case 0:<br>
>> + if (U->size())<br>
>> + U->erase(U->begin() + rand() % U->size());<br>
>> + break;<br>
>> + case 1:<br>
>> + if (U->empty()) {<br>
>> + U->push_back(RandCh());<br>
>> + } else if (U->size() < MaxLen) {<br>
>> + U->insert(U->begin() + rand() % U->size(), RandCh());<br>
>> + } else { // At MaxLen.<br>
>> + uint8_t Ch = RandCh();<br>
>> + size_t Idx = rand() % U->size();<br>
>> + (*U)[Idx] = Ch;<br>
>> + }<br>
>> + break;<br>
>> + default:<br>
>> + if (!U->empty()) {<br>
>> + size_t idx = rand() % U->size();<br>
>> + (*U)[idx] = FlipRandomBit((*U)[idx]);<br>
>> + }<br>
>> + break;<br>
>> + }<br>
>> +}<br>
>> +<br>
>> +} // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,61 @@<br>
>> +//===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//<br>
>> +//<br>
>> +// The LLVM Compiler Infrastructure<br>
>> +//<br>
>> +// This file is distributed under the University of Illinois Open Source<br>
>> +// License. See LICENSE.TXT for details.<br>
>> +//<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +// Misc utils.<br>
>> +//===----------------------------------------------------------------------===//<br>
>> +<br>
>> +#include "FuzzerInternal.h"<br>
>> +#include <iostream><br>
>> +#include <sys/time.h><br>
<br>
</div></div>sys/time.h does not exist on Windows with MSVC.<br>
<div><div class="h5"><br></div></div></blockquote><div>ditto </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5">
>> +#include <cassert><br>
>> +#include <cstring><br>
>> +#include <signal.h><br>
>> +<br>
>> +namespace fuzzer {<br>
>> +<br>
>> +void Print(const Unit &v, const char *PrintAfter) {<br>
>> + std::cerr << v.size() << ": ";<br>
>> + for (auto x : v)<br>
>> + std::cerr << (unsigned) x << " ";<br>
>> + std::cerr << PrintAfter;<br>
>> +}<br>
>> +<br>
>> +void PrintASCII(const Unit &U, const char *PrintAfter) {<br>
>> + for (auto X : U)<br>
>> + std::cerr << (char)((isascii(X) && X >= ' ') ? X : '?');<br>
>> + std::cerr << PrintAfter;<br>
>> +}<br>
>> +<br>
>> +std::string Hash(const Unit &in) {<br>
>> + size_t h1 = 0, h2 = 0;<br>
>> + for (auto x : in) {<br>
>> + h1 += x;<br>
>> + h1 *= 5;<br>
>> + h2 += x;<br>
>> + h2 *= 7;<br>
>> + }<br>
>> + return std::to_string(h1) + std::to_string(h2);<br>
>> +}<br>
>> +<br>
>> +static void AlarmHandler(int, siginfo_t *, void *) {<br>
>> + Fuzzer::AlarmCallback();<br>
>> +}<br>
>> +<br>
>> +void SetTimer(int Seconds) {<br>
>> + struct itimerval T {{Seconds, 0}, {Seconds, 0}};<br>
>> + std::cerr << "SetTimer " << Seconds << "\n";<br>
>> + int Res = setitimer(ITIMER_REAL, &T, nullptr);<br>
>> + assert(Res == 0);<br>
>> + struct sigaction sigact;<br>
>> + memset(&sigact, 0, sizeof(sigact));<br>
>> + sigact.sa_sigaction = AlarmHandler;<br>
>> + Res = sigaction(SIGALRM, &sigact, 0);<br>
>> + assert(Res == 0);<br>
>> +}<br>
>> +<br>
>> +} // namespace fuzzer<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/README.txt<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/README.txt?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/README.txt?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/README.txt (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/README.txt Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,56 @@<br>
>> +===============================<br>
>> +Fuzzer -- a library for coverage-guided fuzz testing.<br>
>> +===============================<br>
>> +<br>
>> +This library is intended primarily for in-process coverage-guided fuzz testing<br>
>> +(fuzzing) of other libraries. The typical workflow looks like this:<br>
>> +<br>
>> + * Build the Fuzzer library as a static archive (or just a set of .o files).<br>
>> + Note that the Fuzzer contains the main() function.<br>
>> + Preferably do *not* use sanitizers while building the Fuzzer.<br>
>> + * Build the library you are going to test with -fsanitize-coverage=[234]<br>
>> + and one of the sanitizers. We recommend to build the library in several<br>
>> + different modes (e.g. asan, msan, lsan, ubsan, etc) and even using different<br>
>> + optimizations options (e.g. -O0, -O1, -O2) to diversify testing.<br>
>> + * Build a test driver using the same options as the library.<br>
>> + The test driver is a C/C++ file containing interesting calls to the library<br>
>> + inside a single function:<br>
>> + extern "C" void TestOneInput(const uint8_t *Data, size_t Size);<br>
>> + * Link the Fuzzer, the library and the driver together into an executable<br>
>> + using the same sanitizer options as for the library.<br>
>> + * Collect the initial corpus of inputs for the<br>
>> + fuzzer (a directory with test inputs, one file per input).<br>
>> + The better your inputs are the faster you will find something interesting.<br>
>> + Also try to keep your inputs small, otherwise the Fuzzer will run too slow.<br>
>> + * Run the fuzzer with the test corpus. As new interesting test cases are<br>
>> + discovered they will be added to the corpus. If a bug is discovered by<br>
>> + the sanitizer (asan, etc) it will be reported as usual and the reproducer<br>
>> + will be written to disk.<br>
>> + Each Fuzzer process is single-threaded (unless the library starts its own<br>
>> + threads). You can run the Fuzzer on the same corpus in multiple processes.<br>
>> + in parallel. For run-time options run the Fuzzer binary with '-help=1'.<br>
>> +<br>
>> +<br>
>> +The Fuzzer is similar in concept to AFL (<a href="http://lcamtuf.coredump.cx/afl/" target="_blank">http://lcamtuf.coredump.cx/afl/</a>),<br>
>> +but uses in-process Fuzzing, which is more fragile, more restrictive, but<br>
>> +potentially much faster as it has no overhead for process start-up.<br>
>> +It uses LLVM's "Sanitizer Coverage" instrumentation to get in-process<br>
>> +coverage-feedback <a href="https://code.google.com/p/address-sanitizer/wiki/AsanCoverage" target="_blank">https://code.google.com/p/address-sanitizer/wiki/AsanCoverage</a><br>
>> +<br>
>> +The code resides in the LLVM repository and is (or will be) used by various<br>
>> +parts of LLVM, but the Fuzzer itself does not (and should not) depend on any<br>
>> +part of LLVM and can be used for other projects. Ideally, the Fuzzer's code<br>
>> +should not have any external dependencies. Right now it uses STL, which may need<br>
>> +to be fixed later.<br>
>> +<br>
>> +Examples of usage in LLVM:<br>
>> + * clang-format-fuzzer. The inputs are random pieces of C++-like text.<br>
>> + * TODO: add more<br>
>> +<br>
>> +Toy example (see SimpleTest.cpp):<br>
>> +a simple function that does something interesting if it receives bytes "Hi!".<br>
>> + # Build the Fuzzer with asan:<br>
>> + % clang++ -std=c++11 -fsanitize=address -fsanitize-coverage=3 -O1 -g \<br>
>> + Fuzzer*.cpp test/SimpleTest.cpp<br>
>> + # Run the fuzzer with no corpus (assuming on empty input)<br>
>> + % ./a.out<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/ExactTest.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/ExactTest.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/ExactTest.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/ExactTest.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/ExactTest.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,21 @@<br>
>> +// Simple test for a fuzzer. The fuzzer must find the string "FUZZER".<br>
>> +#include <cstdlib><br>
>> +#include <cstddef><br>
>> +#include <iostream><br>
>> +<br>
>> +static volatile int Sink;<br>
>> +<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {<br>
>> + int bits = 0;<br>
>> + if (Size > 0 && Data[0] == 'F') bits |= 1;<br>
>> + if (Size > 1 && Data[1] == 'U') bits |= 2;<br>
>> + if (Size > 2 && Data[2] == 'Z') bits |= 4;<br>
>> + if (Size > 3 && Data[3] == 'Z') bits |= 8;<br>
>> + if (Size > 4 && Data[4] == 'E') bits |= 16;<br>
>> + if (Size > 5 && Data[5] == 'R') bits |= 32;<br>
>> + if (bits == 63) {<br>
>> + std::cerr << "BINGO!\n";<br>
>> + abort();<br>
>> + }<br>
>> +}<br>
>> +<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/InfiniteTest.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,19 @@<br>
>> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".<br>
>> +#include <cstdlib><br>
>> +#include <cstddef><br>
>> +#include <iostream><br>
>> +<br>
>> +static volatile int Sink;<br>
>> +<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {<br>
>> + if (Size > 0 && Data[0] == 'H') {<br>
>> + Sink = 1;<br>
>> + if (Size > 1 && Data[1] == 'i') {<br>
>> + Sink = 2;<br>
>> + if (Size > 2 && Data[2] == '!') {<br>
>> + Size = 2;<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> +}<br>
>> +<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/NullDerefTest.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,21 @@<br>
>> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".<br>
>> +#include <cstdlib><br>
>> +#include <cstddef><br>
>> +#include <iostream><br>
>> +<br>
>> +static volatile int Sink;<br>
>> +static volatile int *Null = 0;<br>
>> +<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {<br>
>> + if (Size > 0 && Data[0] == 'H') {<br>
>> + Sink = 1;<br>
>> + if (Size > 1 && Data[1] == 'i') {<br>
>> + Sink = 2;<br>
>> + if (Size > 2 && Data[2] == '!') {<br>
>> + std::cout << "Found the target, dereferencing NULL\n";<br>
>> + *Null = 1;<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> +}<br>
>> +<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/SimpleTest.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,20 @@<br>
>> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".<br>
>> +#include <cstdlib><br>
>> +#include <cstddef><br>
>> +#include <iostream><br>
>> +<br>
>> +static volatile int Sink;<br>
>> +<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {<br>
>> + if (Size > 0 && Data[0] == 'H') {<br>
>> + Sink = 1;<br>
>> + if (Size > 1 && Data[1] == 'i') {<br>
>> + Sink = 2;<br>
>> + if (Size > 2 && Data[2] == '!') {<br>
>> + std::cout << "Found the target, exiting\n";<br>
>> + exit(0);<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> +}<br>
>> +<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/TestFuzzerCrossOver.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,13 @@<br>
>> +#include "FuzzerInternal.h"<br>
>> +<br>
>> +int main() {<br>
>> + using namespace fuzzer;<br>
>> + Unit A({0, 1, 2, 3, 4}), B({5, 6, 7, 8, 9});<br>
>> + Unit C;<br>
>> + for (size_t Len = 1; Len < 15; Len++) {<br>
>> + for (int Iter = 0; Iter < 1000; Iter++) {<br>
>> + CrossOver(A, B, &C, Len);<br>
>> + Print(C);<br>
>> + }<br>
>> + }<br>
>> +}<br>
>><br>
>> Added: llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp<br>
>> URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp?rev=227252&view=auto" target="_blank">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp?rev=227252&view=auto</a><br>
>> ==============================================================================<br>
>> --- llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp (added)<br>
>> +++ llvm/trunk/lib/Fuzzer/test/TimeoutTest.cpp Tue Jan 27 16:08:41 2015<br>
>> @@ -0,0 +1,21 @@<br>
>> +// Simple test for a fuzzer. The fuzzer must find the string "Hi!".<br>
>> +#include <cstdlib><br>
>> +#include <cstddef><br>
>> +#include <iostream><br>
>> +<br>
>> +static volatile int Sink;<br>
>> +<br>
>> +extern "C" void TestOneInput(const uint8_t *Data, size_t Size) {<br>
>> + if (Size > 0 && Data[0] == 'H') {<br>
>> + Sink = 1;<br>
>> + if (Size > 1 && Data[1] == 'i') {<br>
>> + Sink = 2;<br>
>> + if (Size > 2 && Data[2] == '!') {<br>
>> + Size = 2;<br>
>> + while (Sink)<br>
>> + ;<br>
>> + }<br>
>> + }<br>
>> + }<br>
>> +}<br>
>> +<br>
<br>
</div></div>Aside from the obvious errors for MSVC, it does not compile cleanly:<br>
<br>
Warning 1 warning C4530: C++ exception handler used, but unwind<br>
semantics are not enabled. Specify /EHsc<br>
(E:\llvm\llvm\lib\Fuzzer\FuzzerLoop.cpp) D:\Program Files Warning 5<br>
warning C4305: 'initializing' : truncation from 'int' to 'bool'<br>
(E:\llvm\llvm\lib\Fuzzer\FuzzerIO.cpp)<br>
e:\llvm\llvm\lib\fuzzer\FuzzerInternal.h 44<br>
Warning 13 warning C4530: C++ exception handler used, but unwind<br>
semantics are not enabled. Specify /EHsc D:\Program Files<br>
(x86)\Microsoft Visual Studio<br>
<br>
(And some variation of these repeat dozens of times.)<br>
<span class=""><font color="#888888"><br>
~Aaron<br>
</font></span><div class=""><div class="h5"><br>
>><br>
>><br>
>> _______________________________________________<br>
>> llvm-commits mailing list<br>
>> <a href="mailto:llvm-commits@cs.uiuc.edu">llvm-commits@cs.uiuc.edu</a><br>
>> <a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits" target="_blank">http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</a><br>
</div></div></blockquote></div><br></div></div>