546 lines
18 KiB
C++
546 lines
18 KiB
C++
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//===- FuzzerDriver.cpp - FuzzerDriver function and flags -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// FuzzerDriver and flag parsing.
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//===----------------------------------------------------------------------===//
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#include "FuzzerCorpus.h"
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#include "FuzzerInterface.h"
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#include "FuzzerInternal.h"
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#include "FuzzerIO.h"
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#include "FuzzerMutate.h"
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#include "FuzzerRandom.h"
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#include "FuzzerTracePC.h"
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#include <algorithm>
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#include <atomic>
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#include <chrono>
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#include <cstring>
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#include <mutex>
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#include <string>
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#include <thread>
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// This function should be present in the libFuzzer so that the client
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// binary can test for its existence.
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extern "C" __attribute__((used)) void __libfuzzer_is_present() {}
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namespace fuzzer {
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// Program arguments.
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struct FlagDescription {
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const char *Name;
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const char *Description;
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int Default;
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int *IntFlag;
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const char **StrFlag;
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unsigned int *UIntFlag;
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};
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struct {
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#define FUZZER_DEPRECATED_FLAG(Name)
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#define FUZZER_FLAG_INT(Name, Default, Description) int Name;
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#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) unsigned int Name;
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#define FUZZER_FLAG_STRING(Name, Description) const char *Name;
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#include "FuzzerFlags.def"
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#undef FUZZER_DEPRECATED_FLAG
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#undef FUZZER_FLAG_INT
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#undef FUZZER_FLAG_UNSIGNED
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#undef FUZZER_FLAG_STRING
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} Flags;
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static const FlagDescription FlagDescriptions [] {
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#define FUZZER_DEPRECATED_FLAG(Name) \
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{#Name, "Deprecated; don't use", 0, nullptr, nullptr, nullptr},
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#define FUZZER_FLAG_INT(Name, Default, Description) \
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{#Name, Description, Default, &Flags.Name, nullptr, nullptr},
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#define FUZZER_FLAG_UNSIGNED(Name, Default, Description) \
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{#Name, Description, static_cast<int>(Default), \
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nullptr, nullptr, &Flags.Name},
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#define FUZZER_FLAG_STRING(Name, Description) \
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{#Name, Description, 0, nullptr, &Flags.Name, nullptr},
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#include "FuzzerFlags.def"
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#undef FUZZER_DEPRECATED_FLAG
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#undef FUZZER_FLAG_INT
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#undef FUZZER_FLAG_UNSIGNED
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#undef FUZZER_FLAG_STRING
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};
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static const size_t kNumFlags =
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sizeof(FlagDescriptions) / sizeof(FlagDescriptions[0]);
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static std::vector<std::string> *Inputs;
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static std::string *ProgName;
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static void PrintHelp() {
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Printf("Usage:\n");
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auto Prog = ProgName->c_str();
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Printf("\nTo run fuzzing pass 0 or more directories.\n");
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Printf("%s [-flag1=val1 [-flag2=val2 ...] ] [dir1 [dir2 ...] ]\n", Prog);
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Printf("\nTo run individual tests without fuzzing pass 1 or more files:\n");
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Printf("%s [-flag1=val1 [-flag2=val2 ...] ] file1 [file2 ...]\n", Prog);
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Printf("\nFlags: (strictly in form -flag=value)\n");
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size_t MaxFlagLen = 0;
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for (size_t F = 0; F < kNumFlags; F++)
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MaxFlagLen = std::max(strlen(FlagDescriptions[F].Name), MaxFlagLen);
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for (size_t F = 0; F < kNumFlags; F++) {
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const auto &D = FlagDescriptions[F];
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if (strstr(D.Description, "internal flag") == D.Description) continue;
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Printf(" %s", D.Name);
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for (size_t i = 0, n = MaxFlagLen - strlen(D.Name); i < n; i++)
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Printf(" ");
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Printf("\t");
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Printf("%d\t%s\n", D.Default, D.Description);
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}
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Printf("\nFlags starting with '--' will be ignored and "
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"will be passed verbatim to subprocesses.\n");
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}
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static const char *FlagValue(const char *Param, const char *Name) {
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size_t Len = strlen(Name);
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if (Param[0] == '-' && strstr(Param + 1, Name) == Param + 1 &&
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Param[Len + 1] == '=')
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return &Param[Len + 2];
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return nullptr;
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}
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// Avoid calling stol as it triggers a bug in clang/glibc build.
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static long MyStol(const char *Str) {
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long Res = 0;
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long Sign = 1;
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if (*Str == '-') {
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Str++;
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Sign = -1;
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}
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for (size_t i = 0; Str[i]; i++) {
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char Ch = Str[i];
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if (Ch < '0' || Ch > '9')
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return Res;
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Res = Res * 10 + (Ch - '0');
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}
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return Res * Sign;
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}
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static bool ParseOneFlag(const char *Param) {
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if (Param[0] != '-') return false;
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if (Param[1] == '-') {
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static bool PrintedWarning = false;
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if (!PrintedWarning) {
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PrintedWarning = true;
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Printf("INFO: libFuzzer ignores flags that start with '--'\n");
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}
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for (size_t F = 0; F < kNumFlags; F++)
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if (FlagValue(Param + 1, FlagDescriptions[F].Name))
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Printf("WARNING: did you mean '%s' (single dash)?\n", Param + 1);
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return true;
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}
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for (size_t F = 0; F < kNumFlags; F++) {
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const char *Name = FlagDescriptions[F].Name;
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const char *Str = FlagValue(Param, Name);
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if (Str) {
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if (FlagDescriptions[F].IntFlag) {
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int Val = MyStol(Str);
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*FlagDescriptions[F].IntFlag = Val;
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if (Flags.verbosity >= 2)
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Printf("Flag: %s %d\n", Name, Val);
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return true;
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} else if (FlagDescriptions[F].UIntFlag) {
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unsigned int Val = std::stoul(Str);
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*FlagDescriptions[F].UIntFlag = Val;
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if (Flags.verbosity >= 2)
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Printf("Flag: %s %u\n", Name, Val);
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return true;
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} else if (FlagDescriptions[F].StrFlag) {
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*FlagDescriptions[F].StrFlag = Str;
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if (Flags.verbosity >= 2)
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Printf("Flag: %s %s\n", Name, Str);
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return true;
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} else { // Deprecated flag.
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Printf("Flag: %s: deprecated, don't use\n", Name);
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return true;
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}
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}
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}
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Printf("\n\nWARNING: unrecognized flag '%s'; "
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"use -help=1 to list all flags\n\n", Param);
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return true;
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}
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// We don't use any library to minimize dependencies.
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static void ParseFlags(const std::vector<std::string> &Args) {
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for (size_t F = 0; F < kNumFlags; F++) {
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if (FlagDescriptions[F].IntFlag)
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*FlagDescriptions[F].IntFlag = FlagDescriptions[F].Default;
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if (FlagDescriptions[F].UIntFlag)
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*FlagDescriptions[F].UIntFlag =
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static_cast<unsigned int>(FlagDescriptions[F].Default);
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if (FlagDescriptions[F].StrFlag)
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*FlagDescriptions[F].StrFlag = nullptr;
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}
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Inputs = new std::vector<std::string>;
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for (size_t A = 1; A < Args.size(); A++) {
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if (ParseOneFlag(Args[A].c_str())) continue;
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Inputs->push_back(Args[A]);
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}
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}
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static std::mutex Mu;
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static void PulseThread() {
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while (true) {
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SleepSeconds(600);
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std::lock_guard<std::mutex> Lock(Mu);
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Printf("pulse...\n");
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}
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}
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static void WorkerThread(const std::string &Cmd, std::atomic<unsigned> *Counter,
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unsigned NumJobs, std::atomic<bool> *HasErrors) {
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while (true) {
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unsigned C = (*Counter)++;
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if (C >= NumJobs) break;
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std::string Log = "fuzz-" + std::to_string(C) + ".log";
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std::string ToRun = Cmd + " > " + Log + " 2>&1\n";
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if (Flags.verbosity)
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Printf("%s", ToRun.c_str());
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int ExitCode = ExecuteCommand(ToRun);
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if (ExitCode != 0)
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*HasErrors = true;
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std::lock_guard<std::mutex> Lock(Mu);
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Printf("================== Job %u exited with exit code %d ============\n",
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C, ExitCode);
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fuzzer::CopyFileToErr(Log);
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}
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}
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std::string CloneArgsWithoutX(const std::vector<std::string> &Args,
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const char *X1, const char *X2) {
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std::string Cmd;
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for (auto &S : Args) {
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if (FlagValue(S.c_str(), X1) || FlagValue(S.c_str(), X2))
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continue;
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Cmd += S + " ";
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}
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return Cmd;
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}
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static int RunInMultipleProcesses(const std::vector<std::string> &Args,
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unsigned NumWorkers, unsigned NumJobs) {
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std::atomic<unsigned> Counter(0);
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std::atomic<bool> HasErrors(false);
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std::string Cmd = CloneArgsWithoutX(Args, "jobs", "workers");
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std::vector<std::thread> V;
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std::thread Pulse(PulseThread);
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Pulse.detach();
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for (unsigned i = 0; i < NumWorkers; i++)
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V.push_back(std::thread(WorkerThread, Cmd, &Counter, NumJobs, &HasErrors));
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for (auto &T : V)
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T.join();
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return HasErrors ? 1 : 0;
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}
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static void RssThread(Fuzzer *F, size_t RssLimitMb) {
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while (true) {
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SleepSeconds(1);
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size_t Peak = GetPeakRSSMb();
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if (Peak > RssLimitMb)
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F->RssLimitCallback();
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}
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}
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static void StartRssThread(Fuzzer *F, size_t RssLimitMb) {
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if (!RssLimitMb) return;
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std::thread T(RssThread, F, RssLimitMb);
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T.detach();
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}
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int RunOneTest(Fuzzer *F, const char *InputFilePath, size_t MaxLen) {
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Unit U = FileToVector(InputFilePath);
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if (MaxLen && MaxLen < U.size())
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U.resize(MaxLen);
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F->RunOne(U.data(), U.size());
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F->TryDetectingAMemoryLeak(U.data(), U.size(), true);
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return 0;
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}
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static bool AllInputsAreFiles() {
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if (Inputs->empty()) return false;
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for (auto &Path : *Inputs)
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if (!IsFile(Path))
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return false;
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return true;
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}
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int MinimizeCrashInput(const std::vector<std::string> &Args) {
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if (Inputs->size() != 1) {
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Printf("ERROR: -minimize_crash should be given one input file\n");
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exit(1);
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}
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std::string InputFilePath = Inputs->at(0);
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std::string BaseCmd =
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CloneArgsWithoutX(Args, "minimize_crash", "exact_artifact_path");
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auto InputPos = BaseCmd.find(" " + InputFilePath + " ");
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assert(InputPos != std::string::npos);
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BaseCmd.erase(InputPos, InputFilePath.size() + 1);
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if (Flags.runs <= 0 && Flags.max_total_time == 0) {
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Printf("INFO: you need to specify -runs=N or "
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"-max_total_time=N with -minimize_crash=1\n"
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"INFO: defaulting to -max_total_time=600\n");
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BaseCmd += " -max_total_time=600";
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}
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// BaseCmd += " > /dev/null 2>&1 ";
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std::string CurrentFilePath = InputFilePath;
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while (true) {
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Unit U = FileToVector(CurrentFilePath);
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if (U.size() < 2) {
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Printf("CRASH_MIN: '%s' is small enough\n", CurrentFilePath.c_str());
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return 0;
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}
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Printf("CRASH_MIN: minimizing crash input: '%s' (%zd bytes)\n",
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CurrentFilePath.c_str(), U.size());
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auto Cmd = BaseCmd + " " + CurrentFilePath;
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Printf("CRASH_MIN: executing: %s\n", Cmd.c_str());
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int ExitCode = ExecuteCommand(Cmd);
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if (ExitCode == 0) {
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Printf("ERROR: the input %s did not crash\n", CurrentFilePath.c_str());
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exit(1);
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}
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Printf("CRASH_MIN: '%s' (%zd bytes) caused a crash. Will try to minimize "
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"it further\n",
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CurrentFilePath.c_str(), U.size());
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std::string ArtifactPath = "minimized-from-" + Hash(U);
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Cmd += " -minimize_crash_internal_step=1 -exact_artifact_path=" +
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ArtifactPath;
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Printf("CRASH_MIN: executing: %s\n", Cmd.c_str());
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ExitCode = ExecuteCommand(Cmd);
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if (ExitCode == 0) {
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if (Flags.exact_artifact_path) {
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CurrentFilePath = Flags.exact_artifact_path;
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WriteToFile(U, CurrentFilePath);
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}
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Printf("CRASH_MIN: failed to minimize beyond %s (%d bytes), exiting\n",
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CurrentFilePath.c_str(), U.size());
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return 0;
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}
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CurrentFilePath = ArtifactPath;
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Printf("\n\n\n\n\n\n*********************************\n");
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}
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return 0;
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}
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int MinimizeCrashInputInternalStep(Fuzzer *F, InputCorpus *Corpus) {
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assert(Inputs->size() == 1);
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std::string InputFilePath = Inputs->at(0);
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Unit U = FileToVector(InputFilePath);
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assert(U.size() > 2);
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Printf("INFO: Starting MinimizeCrashInputInternalStep: %zd\n", U.size());
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Corpus->AddToCorpus(U, 0);
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F->SetMaxInputLen(U.size());
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F->SetMaxMutationLen(U.size() - 1);
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|
|
F->MinimizeCrashLoop(U);
|
||
|
|
Printf("INFO: Done MinimizeCrashInputInternalStep, no crashes found\n");
|
||
|
|
exit(0);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
|
||
|
|
using namespace fuzzer;
|
||
|
|
assert(argc && argv && "Argument pointers cannot be nullptr");
|
||
|
|
EF = new ExternalFunctions();
|
||
|
|
if (EF->LLVMFuzzerInitialize)
|
||
|
|
EF->LLVMFuzzerInitialize(argc, argv);
|
||
|
|
const std::vector<std::string> Args(*argv, *argv + *argc);
|
||
|
|
assert(!Args.empty());
|
||
|
|
ProgName = new std::string(Args[0]);
|
||
|
|
ParseFlags(Args);
|
||
|
|
if (Flags.help) {
|
||
|
|
PrintHelp();
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Flags.minimize_crash)
|
||
|
|
return MinimizeCrashInput(Args);
|
||
|
|
|
||
|
|
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);
|
||
|
|
|
||
|
|
const size_t kMaxSaneLen = 1 << 20;
|
||
|
|
const size_t kMinDefaultLen = 64;
|
||
|
|
FuzzingOptions Options;
|
||
|
|
Options.Verbosity = Flags.verbosity;
|
||
|
|
Options.MaxLen = Flags.max_len;
|
||
|
|
Options.UnitTimeoutSec = Flags.timeout;
|
||
|
|
Options.ErrorExitCode = Flags.error_exitcode;
|
||
|
|
Options.TimeoutExitCode = Flags.timeout_exitcode;
|
||
|
|
Options.MaxTotalTimeSec = Flags.max_total_time;
|
||
|
|
Options.DoCrossOver = Flags.cross_over;
|
||
|
|
Options.MutateDepth = Flags.mutate_depth;
|
||
|
|
Options.UseCounters = Flags.use_counters;
|
||
|
|
Options.UseIndirCalls = Flags.use_indir_calls;
|
||
|
|
Options.UseMemcmp = Flags.use_memcmp;
|
||
|
|
Options.UseMemmem = Flags.use_memmem;
|
||
|
|
Options.UseCmp = Flags.use_cmp;
|
||
|
|
Options.UseValueProfile = Flags.use_value_profile;
|
||
|
|
Options.Shrink = Flags.shrink;
|
||
|
|
Options.ShuffleAtStartUp = Flags.shuffle;
|
||
|
|
Options.PreferSmall = Flags.prefer_small;
|
||
|
|
Options.ReloadIntervalSec = Flags.reload;
|
||
|
|
Options.OnlyASCII = Flags.only_ascii;
|
||
|
|
Options.OutputCSV = Flags.output_csv;
|
||
|
|
Options.DetectLeaks = Flags.detect_leaks;
|
||
|
|
Options.TraceMalloc = Flags.trace_malloc;
|
||
|
|
Options.RssLimitMb = Flags.rss_limit_mb;
|
||
|
|
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;
|
||
|
|
std::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 DoPlainRun = AllInputsAreFiles();
|
||
|
|
Options.SaveArtifacts =
|
||
|
|
!DoPlainRun || Flags.minimize_crash_internal_step;
|
||
|
|
Options.PrintNewCovPcs = Flags.print_pcs;
|
||
|
|
Options.PrintFinalStats = Flags.print_final_stats;
|
||
|
|
Options.PrintCorpusStats = Flags.print_corpus_stats;
|
||
|
|
Options.PrintCoverage = Flags.print_coverage;
|
||
|
|
Options.DumpCoverage = Flags.dump_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;
|
||
|
|
|
||
|
|
unsigned Seed = Flags.seed;
|
||
|
|
// Initialize Seed.
|
||
|
|
if (Seed == 0)
|
||
|
|
Seed = (std::chrono::system_clock::now().time_since_epoch().count() << 10) +
|
||
|
|
GetPid();
|
||
|
|
if (Flags.verbosity)
|
||
|
|
Printf("INFO: Seed: %u\n", Seed);
|
||
|
|
|
||
|
|
Random Rand(Seed);
|
||
|
|
auto *MD = new MutationDispatcher(Rand, Options);
|
||
|
|
auto *Corpus = new InputCorpus(Options.OutputCorpus);
|
||
|
|
auto *F = new Fuzzer(Callback, *Corpus, *MD, Options);
|
||
|
|
|
||
|
|
for (auto &U: Dictionary)
|
||
|
|
if (U.size() <= Word::GetMaxSize())
|
||
|
|
MD->AddWordToManualDictionary(Word(U.data(), U.size()));
|
||
|
|
|
||
|
|
StartRssThread(F, Flags.rss_limit_mb);
|
||
|
|
|
||
|
|
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;
|
||
|
|
SetSignalHandler(Options);
|
||
|
|
|
||
|
|
if (Flags.minimize_crash_internal_step)
|
||
|
|
return MinimizeCrashInputInternalStep(F, Corpus);
|
||
|
|
|
||
|
|
if (DoPlainRun) {
|
||
|
|
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();
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Flags.merge) {
|
||
|
|
if (Options.MaxLen == 0)
|
||
|
|
F->SetMaxInputLen(kMaxSaneLen);
|
||
|
|
if (TPC.UsingTracePcGuard()) {
|
||
|
|
if (Flags.merge_control_file)
|
||
|
|
F->CrashResistantMergeInternalStep(Flags.merge_control_file);
|
||
|
|
else
|
||
|
|
F->CrashResistantMerge(Args, *Inputs);
|
||
|
|
} else {
|
||
|
|
F->Merge(*Inputs);
|
||
|
|
}
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t TemporaryMaxLen = Options.MaxLen ? Options.MaxLen : kMaxSaneLen;
|
||
|
|
|
||
|
|
UnitVector InitialCorpus;
|
||
|
|
for (auto &Inp : *Inputs) {
|
||
|
|
Printf("Loading corpus dir: %s\n", Inp.c_str());
|
||
|
|
ReadDirToVectorOfUnits(Inp.c_str(), &InitialCorpus, nullptr,
|
||
|
|
TemporaryMaxLen, /*ExitOnError=*/false);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Options.MaxLen == 0) {
|
||
|
|
size_t MaxLen = 0;
|
||
|
|
for (auto &U : InitialCorpus)
|
||
|
|
MaxLen = std::max(U.size(), MaxLen);
|
||
|
|
F->SetMaxInputLen(std::min(std::max(kMinDefaultLen, MaxLen), kMaxSaneLen));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (InitialCorpus.empty()) {
|
||
|
|
InitialCorpus.push_back(Unit({'\n'})); // Valid ASCII input.
|
||
|
|
if (Options.Verbosity)
|
||
|
|
Printf("INFO: A corpus is not provided, starting from an empty corpus\n");
|
||
|
|
}
|
||
|
|
F->ShuffleAndMinimize(&InitialCorpus);
|
||
|
|
InitialCorpus.clear(); // Don't need this memory any more.
|
||
|
|
F->Loop();
|
||
|
|
|
||
|
|
if (Flags.verbosity)
|
||
|
|
Printf("Done %d runs in %zd second(s)\n", F->getTotalNumberOfRuns(),
|
||
|
|
F->secondsSinceProcessStartUp());
|
||
|
|
F->PrintFinalStats();
|
||
|
|
|
||
|
|
exit(0); // Don't let F destroy itself.
|
||
|
|
}
|
||
|
|
|
||
|
|
// Storage for global ExternalFunctions object.
|
||
|
|
ExternalFunctions *EF = nullptr;
|
||
|
|
|
||
|
|
} // namespace fuzzer
|