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Diffstat (limited to 'tools/fuzzing/libfuzzer/FuzzerDriver.cpp')
| -rw-r--r-- | tools/fuzzing/libfuzzer/FuzzerDriver.cpp | 888 |
1 files changed, 888 insertions, 0 deletions
diff --git a/tools/fuzzing/libfuzzer/FuzzerDriver.cpp b/tools/fuzzing/libfuzzer/FuzzerDriver.cpp new file mode 100644 index 0000000000..bedad16efa --- /dev/null +++ b/tools/fuzzing/libfuzzer/FuzzerDriver.cpp @@ -0,0 +1,888 @@ +//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +// FuzzerDriver and flag parsing. +//===----------------------------------------------------------------------===// + +#include "FuzzerCommand.h" +#include "FuzzerCorpus.h" +#include "FuzzerFork.h" +#include "FuzzerIO.h" +#include "FuzzerInterface.h" +#include "FuzzerInternal.h" +#include "FuzzerMerge.h" +#include "FuzzerMutate.h" +#include "FuzzerPlatform.h" +#include "FuzzerRandom.h" +#include "FuzzerTracePC.h" +#include <algorithm> +#include <atomic> +#include <chrono> +#include <cstdlib> +#include <cstring> +#include <mutex> +#include <string> +#include <thread> +#include <fstream> + +// This function should be present in the libFuzzer so that the client +// binary can test for its existence. +#if LIBFUZZER_MSVC +extern "C" void __libfuzzer_is_present() {} +#if defined(_M_IX86) || defined(__i386__) +#pragma comment(linker, "/include:___libfuzzer_is_present") +#else +#pragma comment(linker, "/include:__libfuzzer_is_present") +#endif +#else +extern "C" __attribute__((used)) void __libfuzzer_is_present() {} +#endif // LIBFUZZER_MSVC + +namespace fuzzer { + +// Program arguments. +struct FlagDescription { + const char *Name; + const char *Description; + int Default; + int *IntFlag; + const char **StrFlag; + unsigned int *UIntFlag; +}; + +struct { +#define FUZZER_DEPRECATED_FLAG(Name) +#define FUZZER_FLAG_INT(Name, Default, Description) int Name; +#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) unsigned int Name; +#define FUZZER_FLAG_STRING(Name, Description) const char *Name; +#include "FuzzerFlags.def" +#undef FUZZER_DEPRECATED_FLAG +#undef FUZZER_FLAG_INT +#undef FUZZER_FLAG_UNSIGNED +#undef FUZZER_FLAG_STRING +} Flags; + +static const FlagDescription FlagDescriptions [] { +#define FUZZER_DEPRECATED_FLAG(Name) \ + {#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr}, +#define FUZZER_FLAG_INT(Name, Default, Description) \ + {#Name, Description, Default, &Flags.Name, nullptr, nullptr}, +#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) \ + {#Name, Description, static_cast<int>(Default), \ + nullptr, nullptr, &Flags.Name}, +#define FUZZER_FLAG_STRING(Name, Description) \ + {#Name, Description, 0, nullptr, &Flags.Name, nullptr}, +#include "FuzzerFlags.def" +#undef FUZZER_DEPRECATED_FLAG +#undef FUZZER_FLAG_INT +#undef FUZZER_FLAG_UNSIGNED +#undef FUZZER_FLAG_STRING +}; + +static const size_t kNumFlags = + sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]); + +static Vector<std::string> *Inputs; +static std::string *ProgName; + +static void PrintHelp() { + Printf("Usage:\n"); + auto Prog = ProgName->c_str(); + Printf("\nTo run fuzzing pass 0 or more directories.\n"); + Printf("%s [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n", Prog); + + Printf("\nTo run individual tests without fuzzing pass 1 or more files:\n"); + Printf("%s [-flag1=val1 [-flag2=val2 ...] ] file1 [file2 ...]\n", Prog); + + Printf("\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]; + if (strstr(D.Description, "internal flag") == D.Description) continue; + Printf(" %s", D.Name); + for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++) + Printf(" "); + Printf("\t"); + Printf("%d\t%s\n", D.Default, D.Description); + } + Printf("\nFlags starting with '--' will be ignored and " + "will be passed verbatim to subprocesses.\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; +} + +// Avoid calling stol as it triggers a bug in clang/glibc build. +static long MyStol(const char *Str) { + long Res = 0; + long Sign = 1; + if (*Str == '-') { + Str++; + Sign = -1; + } + for (size_t i = 0; Str[i]; i++) { + char Ch = Str[i]; + if (Ch < '0' || Ch > '9') + return Res; + Res = Res * 10 + (Ch - '0'); + } + return Res * Sign; +} + +static bool ParseOneFlag(const char *Param) { + if (Param[0] != '-') return false; + if (Param[1] == '-') { + static bool PrintedWarning = false; + if (!PrintedWarning) { + PrintedWarning = true; + Printf("INFO: libFuzzer ignores flags that start with '--'\n"); + } + for (size_t F = 0; F < kNumFlags; F++) + if (FlagValue(Param + 1, FlagDescriptions[F].Name)) + Printf("WARNING: did you mean '%s' (single dash)?\n", Param + 1); + return true; + } + for (size_t F = 0; F < kNumFlags; F++) { + const char *Name = FlagDescriptions[F].Name; + const char *Str = FlagValue(Param, Name); + if (Str) { + if (FlagDescriptions[F].IntFlag) { + int Val = MyStol(Str); + *FlagDescriptions[F].IntFlag = Val; + if (Flags.verbosity >= 2) + Printf("Flag: %s %d\n", Name, Val); + return true; + } else if (FlagDescriptions[F].UIntFlag) { + unsigned int Val = std::stoul(Str); + *FlagDescriptions[F].UIntFlag = Val; + if (Flags.verbosity >= 2) + Printf("Flag: %s %u\n", Name, Val); + return true; + } else if (FlagDescriptions[F].StrFlag) { + *FlagDescriptions[F].StrFlag = Str; + if (Flags.verbosity >= 2) + Printf("Flag: %s %s\n", Name, Str); + return true; + } else { // Deprecated flag. + Printf("Flag: %s: deprecated, don't use\n", Name); + return true; + } + } + } + Printf("\n\nWARNING: unrecognized flag '%s'; " + "use -help=1 to list all flags\n\n", Param); + return true; +} + +// We don't use any library to minimize dependencies. +static void ParseFlags(const Vector<std::string> &Args, + const ExternalFunctions *EF) { + for (size_t F = 0; F < kNumFlags; F++) { + if (FlagDescriptions[F].IntFlag) + *FlagDescriptions[F].IntFlag = FlagDescriptions[F].Default; + if (FlagDescriptions[F].UIntFlag) + *FlagDescriptions[F].UIntFlag = + static_cast<unsigned int>(FlagDescriptions[F].Default); + if (FlagDescriptions[F].StrFlag) + *FlagDescriptions[F].StrFlag = nullptr; + } + + // Disable len_control by default, if LLVMFuzzerCustomMutator is used. + if (EF->LLVMFuzzerCustomMutator) { + Flags.len_control = 0; + Printf("INFO: found LLVMFuzzerCustomMutator (%p). " + "Disabling -len_control by default.\n", EF->LLVMFuzzerCustomMutator); + } + + Inputs = new Vector<std::string>; + for (size_t A = 1; A < Args.size(); A++) { + if (ParseOneFlag(Args[A].c_str())) { + if (Flags.ignore_remaining_args) + break; + continue; + } + Inputs->push_back(Args[A]); + } +} + +static std::mutex Mu; + +static void PulseThread() { + while (true) { + SleepSeconds(600); + std::lock_guard<std::mutex> Lock(Mu); + Printf("pulse...\n"); + } +} + +static void WorkerThread(const Command &BaseCmd, std::atomic<unsigned> *Counter, + unsigned NumJobs, std::atomic<bool> *HasErrors) { + while (true) { + unsigned C = (*Counter)++; + if (C >= NumJobs) break; + std::string Log = "fuzz-" + std::to_string(C) + ".log"; + Command Cmd(BaseCmd); + Cmd.setOutputFile(Log); + Cmd.combineOutAndErr(); + if (Flags.verbosity) { + std::string CommandLine = Cmd.toString(); + Printf("%s\n", CommandLine.c_str()); + } + int ExitCode = ExecuteCommand(Cmd); + if (ExitCode != 0) + *HasErrors = true; + std::lock_guard<std::mutex> Lock(Mu); + Printf("================== Job %u exited with exit code %d ============\n", + C, ExitCode); + fuzzer::CopyFileToErr(Log); + } +} + +std::string CloneArgsWithoutX(const Vector<std::string> &Args, + const char *X1, const char *X2) { + std::string Cmd; + for (auto &S : Args) { + if (FlagValue(S.c_str(), X1) || FlagValue(S.c_str(), X2)) + continue; + Cmd += S + " "; + } + return Cmd; +} + +static int RunInMultipleProcesses(const Vector<std::string> &Args, + unsigned NumWorkers, unsigned NumJobs) { + std::atomic<unsigned> Counter(0); + std::atomic<bool> HasErrors(false); + Command Cmd(Args); + Cmd.removeFlag("jobs"); + Cmd.removeFlag("workers"); + Vector<std::thread> V; + std::thread Pulse(PulseThread); + Pulse.detach(); + for (unsigned i = 0; i < NumWorkers; i++) + V.push_back(std::thread(WorkerThread, std::ref(Cmd), &Counter, NumJobs, &HasErrors)); + for (auto &T : V) + T.join(); + return HasErrors ? 1 : 0; +} + +static void RssThread(Fuzzer *F, size_t RssLimitMb) { + while (true) { + SleepSeconds(1); + size_t Peak = GetPeakRSSMb(); + if (Peak > RssLimitMb) + F->RssLimitCallback(); + } +} + +static void StartRssThread(Fuzzer *F, size_t RssLimitMb) { + if (!RssLimitMb) + return; + std::thread T(RssThread, F, RssLimitMb); + T.detach(); +} + +int RunOneTest(Fuzzer *F, const char *InputFilePath, size_t MaxLen) { + Unit U = FileToVector(InputFilePath); + if (MaxLen && MaxLen < U.size()) + U.resize(MaxLen); + F->ExecuteCallback(U.data(), U.size()); + F->TryDetectingAMemoryLeak(U.data(), U.size(), true); + return 0; +} + +static bool AllInputsAreFiles() { + if (Inputs->empty()) return false; + for (auto &Path : *Inputs) + if (!IsFile(Path)) + return false; + return true; +} + +static std::string GetDedupTokenFromCmdOutput(const std::string &S) { + auto Beg = S.find("DEDUP_TOKEN:"); + if (Beg == std::string::npos) + return ""; + auto End = S.find('\n', Beg); + if (End == std::string::npos) + return ""; + return S.substr(Beg, End - Beg); +} + +int CleanseCrashInput(const Vector<std::string> &Args, + const FuzzingOptions &Options) { + if (Inputs->size() != 1 || !Flags.exact_artifact_path) { + Printf("ERROR: -cleanse_crash should be given one input file and" + " -exact_artifact_path\n"); + return 1; + } + std::string InputFilePath = Inputs->at(0); + std::string OutputFilePath = Flags.exact_artifact_path; + Command Cmd(Args); + Cmd.removeFlag("cleanse_crash"); + + assert(Cmd.hasArgument(InputFilePath)); + Cmd.removeArgument(InputFilePath); + + auto TmpFilePath = TempPath("CleanseCrashInput", ".repro"); + Cmd.addArgument(TmpFilePath); + Cmd.setOutputFile(getDevNull()); + Cmd.combineOutAndErr(); + + std::string CurrentFilePath = InputFilePath; + auto U = FileToVector(CurrentFilePath); + size_t Size = U.size(); + + const Vector<uint8_t> ReplacementBytes = {' ', 0xff}; + for (int NumAttempts = 0; NumAttempts < 5; NumAttempts++) { + bool Changed = false; + for (size_t Idx = 0; Idx < Size; Idx++) { + Printf("CLEANSE[%d]: Trying to replace byte %zd of %zd\n", NumAttempts, + Idx, Size); + uint8_t OriginalByte = U[Idx]; + if (ReplacementBytes.end() != std::find(ReplacementBytes.begin(), + ReplacementBytes.end(), + OriginalByte)) + continue; + for (auto NewByte : ReplacementBytes) { + U[Idx] = NewByte; + WriteToFile(U, TmpFilePath); + auto ExitCode = ExecuteCommand(Cmd); + RemoveFile(TmpFilePath); + if (!ExitCode) { + U[Idx] = OriginalByte; + } else { + Changed = true; + Printf("CLEANSE: Replaced byte %zd with 0x%x\n", Idx, NewByte); + WriteToFile(U, OutputFilePath); + break; + } + } + } + if (!Changed) break; + } + return 0; +} + +int MinimizeCrashInput(const Vector<std::string> &Args, + const FuzzingOptions &Options) { + if (Inputs->size() != 1) { + Printf("ERROR: -minimize_crash should be given one input file\n"); + return 1; + } + std::string InputFilePath = Inputs->at(0); + Command BaseCmd(Args); + BaseCmd.removeFlag("minimize_crash"); + BaseCmd.removeFlag("exact_artifact_path"); + assert(BaseCmd.hasArgument(InputFilePath)); + BaseCmd.removeArgument(InputFilePath); + if (Flags.runs <= 0 && Flags.max_total_time == 0) { + Printf("INFO: you need to specify -runs=N or " + "-max_total_time=N with -minimize_crash=1\n" + "INFO: defaulting to -max_total_time=600\n"); + BaseCmd.addFlag("max_total_time", "600"); + } + + BaseCmd.combineOutAndErr(); + + std::string CurrentFilePath = InputFilePath; + while (true) { + Unit U = FileToVector(CurrentFilePath); + Printf("CRASH_MIN: minimizing crash input: '%s' (%zd bytes)\n", + CurrentFilePath.c_str(), U.size()); + + Command Cmd(BaseCmd); + Cmd.addArgument(CurrentFilePath); + + Printf("CRASH_MIN: executing: %s\n", Cmd.toString().c_str()); + std::string CmdOutput; + bool Success = ExecuteCommand(Cmd, &CmdOutput); + if (Success) { + Printf("ERROR: the input %s did not crash\n", CurrentFilePath.c_str()); + return 1; + } + Printf("CRASH_MIN: '%s' (%zd bytes) caused a crash. Will try to minimize " + "it further\n", + CurrentFilePath.c_str(), U.size()); + auto DedupToken1 = GetDedupTokenFromCmdOutput(CmdOutput); + if (!DedupToken1.empty()) + Printf("CRASH_MIN: DedupToken1: %s\n", DedupToken1.c_str()); + + std::string ArtifactPath = + Flags.exact_artifact_path + ? Flags.exact_artifact_path + : Options.ArtifactPrefix + "minimized-from-" + Hash(U); + Cmd.addFlag("minimize_crash_internal_step", "1"); + Cmd.addFlag("exact_artifact_path", ArtifactPath); + Printf("CRASH_MIN: executing: %s\n", Cmd.toString().c_str()); + CmdOutput.clear(); + Success = ExecuteCommand(Cmd, &CmdOutput); + Printf("%s", CmdOutput.c_str()); + if (Success) { + if (Flags.exact_artifact_path) { + CurrentFilePath = Flags.exact_artifact_path; + WriteToFile(U, CurrentFilePath); + } + Printf("CRASH_MIN: failed to minimize beyond %s (%d bytes), exiting\n", + CurrentFilePath.c_str(), U.size()); + break; + } + auto DedupToken2 = GetDedupTokenFromCmdOutput(CmdOutput); + if (!DedupToken2.empty()) + Printf("CRASH_MIN: DedupToken2: %s\n", DedupToken2.c_str()); + + if (DedupToken1 != DedupToken2) { + if (Flags.exact_artifact_path) { + CurrentFilePath = Flags.exact_artifact_path; + WriteToFile(U, CurrentFilePath); + } + Printf("CRASH_MIN: mismatch in dedup tokens" + " (looks like a different bug). Won't minimize further\n"); + break; + } + + CurrentFilePath = ArtifactPath; + Printf("*********************************\n"); + } + return 0; +} + +int MinimizeCrashInputInternalStep(Fuzzer *F, InputCorpus *Corpus) { + assert(Inputs->size() == 1); + std::string InputFilePath = Inputs->at(0); + Unit U = FileToVector(InputFilePath); + Printf("INFO: Starting MinimizeCrashInputInternalStep: %zd\n", U.size()); + if (U.size() < 2) { + Printf("INFO: The input is small enough, exiting\n"); + return 0; + } + F->SetMaxInputLen(U.size()); + F->SetMaxMutationLen(U.size() - 1); + F->MinimizeCrashLoop(U); + Printf("INFO: Done MinimizeCrashInputInternalStep, no crashes found\n"); + return 0; +} + +int Merge(Fuzzer *F, FuzzingOptions &Options, const Vector<std::string> &Args, + const Vector<std::string> &Corpora, const char *CFPathOrNull) { + if (Corpora.size() < 2) { + Printf("INFO: Merge requires two or more corpus dirs\n"); + return 0; + } + + Vector<SizedFile> OldCorpus, NewCorpus; + int Res = GetSizedFilesFromDir(Corpora[0], &OldCorpus); + if (Res != 0) + return Res; + for (size_t i = 1; i < Corpora.size(); i++) { + Res = GetSizedFilesFromDir(Corpora[i], &NewCorpus); + if (Res != 0) + return Res; + } + std::sort(OldCorpus.begin(), OldCorpus.end()); + std::sort(NewCorpus.begin(), NewCorpus.end()); + + std::string CFPath = CFPathOrNull ? CFPathOrNull : TempPath("Merge", ".txt"); + Vector<std::string> NewFiles; + Set<uint32_t> NewFeatures, NewCov; + Res = CrashResistantMerge(Args, OldCorpus, NewCorpus, &NewFiles, {}, &NewFeatures, + {}, &NewCov, CFPath, true); + if (Res != 0) + return Res; + + if (F->isGracefulExitRequested()) + return 0; + for (auto &Path : NewFiles) + F->WriteToOutputCorpus(FileToVector(Path, Options.MaxLen)); + // We are done, delete the control file if it was a temporary one. + if (!Flags.merge_control_file) + RemoveFile(CFPath); + + return 0; +} + +int AnalyzeDictionary(Fuzzer *F, const Vector<Unit>& Dict, + UnitVector& Corpus) { + Printf("Started dictionary minimization (up to %d tests)\n", + Dict.size() * Corpus.size() * 2); + + // Scores and usage count for each dictionary unit. + Vector<int> Scores(Dict.size()); + Vector<int> Usages(Dict.size()); + + Vector<size_t> InitialFeatures; + Vector<size_t> ModifiedFeatures; + for (auto &C : Corpus) { + // Get coverage for the testcase without modifications. + F->ExecuteCallback(C.data(), C.size()); + InitialFeatures.clear(); + TPC.CollectFeatures([&](size_t Feature) { + InitialFeatures.push_back(Feature); + }); + + for (size_t i = 0; i < Dict.size(); ++i) { + Vector<uint8_t> Data = C; + auto StartPos = std::search(Data.begin(), Data.end(), + Dict[i].begin(), Dict[i].end()); + // Skip dictionary unit, if the testcase does not contain it. + if (StartPos == Data.end()) + continue; + + ++Usages[i]; + while (StartPos != Data.end()) { + // Replace all occurrences of dictionary unit in the testcase. + auto EndPos = StartPos + Dict[i].size(); + for (auto It = StartPos; It != EndPos; ++It) + *It ^= 0xFF; + + StartPos = std::search(EndPos, Data.end(), + Dict[i].begin(), Dict[i].end()); + } + + // Get coverage for testcase with masked occurrences of dictionary unit. + F->ExecuteCallback(Data.data(), Data.size()); + ModifiedFeatures.clear(); + TPC.CollectFeatures([&](size_t Feature) { + ModifiedFeatures.push_back(Feature); + }); + + if (InitialFeatures == ModifiedFeatures) + --Scores[i]; + else + Scores[i] += 2; + } + } + + Printf("###### Useless dictionary elements. ######\n"); + for (size_t i = 0; i < Dict.size(); ++i) { + // Dictionary units with positive score are treated as useful ones. + if (Scores[i] > 0) + continue; + + Printf("\""); + PrintASCII(Dict[i].data(), Dict[i].size(), "\""); + Printf(" # Score: %d, Used: %d\n", Scores[i], Usages[i]); + } + Printf("###### End of useless dictionary elements. ######\n"); + return 0; +} + +int ParseSeedInuts(const char *seed_inputs, Vector<std::string> &Files) { + // Parse -seed_inputs=file1,file2,... or -seed_inputs=@seed_inputs_file + if (!seed_inputs) return 0; + std::string SeedInputs; + if (Flags.seed_inputs[0] == '@') + SeedInputs = FileToString(Flags.seed_inputs + 1); // File contains list. + else + SeedInputs = Flags.seed_inputs; // seed_inputs contains the list. + if (SeedInputs.empty()) { + Printf("seed_inputs is empty or @file does not exist.\n"); + return 1; + } + // Parse SeedInputs. + size_t comma_pos = 0; + while ((comma_pos = SeedInputs.find_last_of(',')) != std::string::npos) { + Files.push_back(SeedInputs.substr(comma_pos + 1)); + SeedInputs = SeedInputs.substr(0, comma_pos); + } + Files.push_back(SeedInputs); + return 0; +} + +static Vector<SizedFile> ReadCorpora(const Vector<std::string> &CorpusDirs, + const Vector<std::string> &ExtraSeedFiles) { + Vector<SizedFile> SizedFiles; + size_t LastNumFiles = 0; + for (auto &Dir : CorpusDirs) { + GetSizedFilesFromDir(Dir, &SizedFiles); + Printf("INFO: % 8zd files found in %s\n", SizedFiles.size() - LastNumFiles, + Dir.c_str()); + LastNumFiles = SizedFiles.size(); + } + for (auto &File : ExtraSeedFiles) + if (auto Size = FileSize(File)) + SizedFiles.push_back({File, Size}); + return SizedFiles; +} + +int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) { + using namespace fuzzer; + assert(argc && argv && "Argument pointers cannot be nullptr"); + std::string Argv0((*argv)[0]); + if (!EF) + EF = new ExternalFunctions(); + if (EF->LLVMFuzzerInitialize) + EF->LLVMFuzzerInitialize(argc, argv); + if (EF->__msan_scoped_disable_interceptor_checks) + EF->__msan_scoped_disable_interceptor_checks(); + const Vector<std::string> Args(*argv, *argv + *argc); + assert(!Args.empty()); + ProgName = new std::string(Args[0]); + if (Argv0 != *ProgName) { + Printf("ERROR: argv[0] has been modified in LLVMFuzzerInitialize\n"); + return 1; + } + ParseFlags(Args, EF); + if (Flags.help) { + PrintHelp(); + return 0; + } + + if (Flags.close_fd_mask & 2) + DupAndCloseStderr(); + if (Flags.close_fd_mask & 1) + CloseStdout(); + + if (Flags.jobs > 0 && Flags.workers == 0) { + Flags.workers = std::min(NumberOfCpuCores() / 2, Flags.jobs); + if (Flags.workers > 1) + Printf("Running %u workers\n", Flags.workers); + } + + if (Flags.workers > 0 && Flags.jobs > 0) + return RunInMultipleProcesses(Args, Flags.workers, Flags.jobs); + + FuzzingOptions Options; + Options.Verbosity = Flags.verbosity; + Options.MaxLen = Flags.max_len; + Options.LenControl = Flags.len_control; + Options.UnitTimeoutSec = Flags.timeout; + Options.ErrorExitCode = Flags.error_exitcode; + Options.TimeoutExitCode = Flags.timeout_exitcode; + Options.IgnoreTimeouts = Flags.ignore_timeouts; + Options.IgnoreOOMs = Flags.ignore_ooms; + Options.IgnoreCrashes = Flags.ignore_crashes; + Options.MaxTotalTimeSec = Flags.max_total_time; + Options.DoCrossOver = Flags.cross_over; + Options.MutateDepth = Flags.mutate_depth; + Options.ReduceDepth = Flags.reduce_depth; + Options.UseCounters = Flags.use_counters; + Options.UseMemmem = Flags.use_memmem; + Options.UseCmp = Flags.use_cmp; + Options.UseValueProfile = Flags.use_value_profile; + Options.Shrink = Flags.shrink; + Options.ReduceInputs = Flags.reduce_inputs; + Options.ShuffleAtStartUp = Flags.shuffle; + Options.PreferSmall = Flags.prefer_small; + Options.ReloadIntervalSec = Flags.reload; + Options.OnlyASCII = Flags.only_ascii; + Options.DetectLeaks = Flags.detect_leaks; + Options.PurgeAllocatorIntervalSec = Flags.purge_allocator_interval; + Options.TraceMalloc = Flags.trace_malloc; + Options.RssLimitMb = Flags.rss_limit_mb; + Options.MallocLimitMb = Flags.malloc_limit_mb; + if (!Options.MallocLimitMb) + Options.MallocLimitMb = Options.RssLimitMb; + if (Flags.runs >= 0) + Options.MaxNumberOfRuns = Flags.runs; + if (!Inputs->empty() && !Flags.minimize_crash_internal_step) + Options.OutputCorpus = (*Inputs)[0]; + Options.ReportSlowUnits = Flags.report_slow_units; + if (Flags.artifact_prefix) + Options.ArtifactPrefix = Flags.artifact_prefix; + if (Flags.exact_artifact_path) + Options.ExactArtifactPath = Flags.exact_artifact_path; + Vector<Unit> Dictionary; + if (Flags.dict) + if (!ParseDictionaryFile(FileToString(Flags.dict), &Dictionary)) + return 1; + if (Flags.verbosity > 0 && !Dictionary.empty()) + Printf("Dictionary: %zd entries\n", Dictionary.size()); + bool RunIndividualFiles = AllInputsAreFiles(); + Options.SaveArtifacts = + !RunIndividualFiles || Flags.minimize_crash_internal_step; + Options.PrintNewCovPcs = Flags.print_pcs; + Options.PrintNewCovFuncs = Flags.print_funcs; + Options.PrintFinalStats = Flags.print_final_stats; + Options.PrintCorpusStats = Flags.print_corpus_stats; + Options.PrintCoverage = Flags.print_coverage; + if (Flags.exit_on_src_pos) + Options.ExitOnSrcPos = Flags.exit_on_src_pos; + if (Flags.exit_on_item) + Options.ExitOnItem = Flags.exit_on_item; + if (Flags.focus_function) + Options.FocusFunction = Flags.focus_function; + if (Flags.data_flow_trace) + Options.DataFlowTrace = Flags.data_flow_trace; + if (Flags.features_dir) + Options.FeaturesDir = Flags.features_dir; + if (Flags.collect_data_flow) + Options.CollectDataFlow = Flags.collect_data_flow; + if (Flags.stop_file) + Options.StopFile = Flags.stop_file; + Options.Entropic = Flags.entropic; + Options.EntropicFeatureFrequencyThreshold = + (size_t)Flags.entropic_feature_frequency_threshold; + Options.EntropicNumberOfRarestFeatures = + (size_t)Flags.entropic_number_of_rarest_features; + if (Options.Entropic) { + if (!Options.FocusFunction.empty()) { + Printf("ERROR: The parameters `--entropic` and `--focus_function` cannot " + "be used together.\n"); + return 1; + } + Printf("INFO: Running with entropic power schedule (0x%X, %d).\n", + Options.EntropicFeatureFrequencyThreshold, + Options.EntropicNumberOfRarestFeatures); + } + struct EntropicOptions Entropic; + Entropic.Enabled = Options.Entropic; + Entropic.FeatureFrequencyThreshold = + Options.EntropicFeatureFrequencyThreshold; + Entropic.NumberOfRarestFeatures = Options.EntropicNumberOfRarestFeatures; + + unsigned Seed = Flags.seed; + // Initialize Seed. + if (Seed == 0) + Seed = + std::chrono::system_clock::now().time_since_epoch().count() + GetPid(); + if (Flags.verbosity) + Printf("INFO: Seed: %u\n", Seed); + + if (Flags.collect_data_flow && !Flags.fork && !Flags.merge) { + if (RunIndividualFiles) + return CollectDataFlow(Flags.collect_data_flow, Flags.data_flow_trace, + ReadCorpora({}, *Inputs)); + else + return CollectDataFlow(Flags.collect_data_flow, Flags.data_flow_trace, + ReadCorpora(*Inputs, {})); + } + + Random Rand(Seed); + auto *MD = new MutationDispatcher(Rand, Options); + auto *Corpus = new InputCorpus(Options.OutputCorpus, Entropic); + auto *F = new Fuzzer(Callback, *Corpus, *MD, Options); + + for (auto &U: Dictionary) + if (U.size() <= Word::GetMaxSize()) + MD->AddWordToManualDictionary(Word(U.data(), U.size())); + + // Threads are only supported by Chrome. Don't use them with emscripten + // for now. +#if !LIBFUZZER_EMSCRIPTEN + StartRssThread(F, Flags.rss_limit_mb); +#endif // LIBFUZZER_EMSCRIPTEN + + Options.HandleAbrt = Flags.handle_abrt; + Options.HandleBus = Flags.handle_bus; + Options.HandleFpe = Flags.handle_fpe; + Options.HandleIll = Flags.handle_ill; + Options.HandleInt = Flags.handle_int; + Options.HandleSegv = Flags.handle_segv; + Options.HandleTerm = Flags.handle_term; + Options.HandleXfsz = Flags.handle_xfsz; + Options.HandleUsr1 = Flags.handle_usr1; + Options.HandleUsr2 = Flags.handle_usr2; + SetSignalHandler(Options); + + std::atexit(Fuzzer::StaticExitCallback); + + if (Flags.minimize_crash) + return MinimizeCrashInput(Args, Options); + + if (Flags.minimize_crash_internal_step) + return MinimizeCrashInputInternalStep(F, Corpus); + + if (Flags.cleanse_crash) + return CleanseCrashInput(Args, Options); + + if (RunIndividualFiles) { + Options.SaveArtifacts = false; + int Runs = std::max(1, Flags.runs); + Printf("%s: Running %zd inputs %d time(s) each.\n", ProgName->c_str(), + Inputs->size(), Runs); + for (auto &Path : *Inputs) { + auto StartTime = system_clock::now(); + Printf("Running: %s\n", Path.c_str()); + for (int Iter = 0; Iter < Runs; Iter++) + RunOneTest(F, Path.c_str(), Options.MaxLen); + auto StopTime = system_clock::now(); + auto MS = duration_cast<milliseconds>(StopTime - StartTime).count(); + Printf("Executed %s in %zd ms\n", Path.c_str(), (long)MS); + } + Printf("***\n" + "*** NOTE: fuzzing was not performed, you have only\n" + "*** executed the target code on a fixed set of inputs.\n" + "***\n"); + F->PrintFinalStats(); + return 0; + } + + if (Flags.fork) + return FuzzWithFork(F->GetMD().GetRand(), Options, Args, *Inputs, Flags.fork); + + if (Flags.merge) + return Merge(F, Options, Args, *Inputs, Flags.merge_control_file); + + if (Flags.merge_inner) { + const size_t kDefaultMaxMergeLen = 1 << 20; + if (Options.MaxLen == 0) + F->SetMaxInputLen(kDefaultMaxMergeLen); + assert(Flags.merge_control_file); + return F->CrashResistantMergeInternalStep(Flags.merge_control_file); + } + + if (Flags.analyze_dict) { + size_t MaxLen = INT_MAX; // Large max length. + UnitVector InitialCorpus; + for (auto &Inp : *Inputs) { + Printf("Loading corpus dir: %s\n", Inp.c_str()); + ReadDirToVectorOfUnits(Inp.c_str(), &InitialCorpus, nullptr, + MaxLen, /*ExitOnError=*/false); + } + + if (Dictionary.empty() || Inputs->empty()) { + Printf("ERROR: can't analyze dict without dict and corpus provided\n"); + return 1; + } + if (AnalyzeDictionary(F, Dictionary, InitialCorpus)) { + Printf("Dictionary analysis failed\n"); + return 1; + } + Printf("Dictionary analysis succeeded\n"); + return 0; + } + + { + Vector<std::string> Files; + int Res = ParseSeedInuts(Flags.seed_inputs, Files); + if (Res != 0) + return Res; + auto CorporaFiles = ReadCorpora(*Inputs, Files); + Res = F->Loop(CorporaFiles); + if (Res != 0) + return Res; + if (F->isGracefulExitRequested()) + return 0; + } + + if (Flags.verbosity) + Printf("Done %zd runs in %zd second(s)\n", F->getTotalNumberOfRuns(), + F->secondsSinceProcessStartUp()); + F->PrintFinalStats(); + + return 0; // Don't let F destroy itself. +} + +extern "C" ATTRIBUTE_INTERFACE int +LLVMFuzzerRunDriver(int *argc, char ***argv, + int (*UserCb)(const uint8_t *Data, size_t Size)) { + return FuzzerDriver(argc, argv, UserCb); +} + +// Storage for global ExternalFunctions object. +ExternalFunctions *EF = nullptr; + +} // namespace fuzzer |