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65f502816c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282458 91177308-0d34-0410-b5e6-96231b3b80d8
310 lines
8.5 KiB
C++
310 lines
8.5 KiB
C++
//===- FuzzerUtil.cpp - Misc utils ----------------------------------------===//
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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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// Misc utils.
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//===----------------------------------------------------------------------===//
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#include "FuzzerInternal.h"
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#include <sstream>
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#include <iomanip>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <cassert>
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#include <chrono>
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#include <cstring>
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#include <signal.h>
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#include <sstream>
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#include <unistd.h>
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#include <errno.h>
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#include <thread>
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namespace fuzzer {
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void PrintHexArray(const uint8_t *Data, size_t Size,
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const char *PrintAfter) {
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for (size_t i = 0; i < Size; i++)
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Printf("0x%x,", (unsigned)Data[i]);
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Printf("%s", PrintAfter);
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}
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void Print(const Unit &v, const char *PrintAfter) {
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PrintHexArray(v.data(), v.size(), PrintAfter);
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}
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void PrintASCIIByte(uint8_t Byte) {
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if (Byte == '\\')
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Printf("\\\\");
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else if (Byte == '"')
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Printf("\\\"");
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else if (Byte >= 32 && Byte < 127)
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Printf("%c", Byte);
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else
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Printf("\\x%02x", Byte);
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}
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void PrintASCII(const uint8_t *Data, size_t Size, const char *PrintAfter) {
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for (size_t i = 0; i < Size; i++)
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PrintASCIIByte(Data[i]);
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Printf("%s", PrintAfter);
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}
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void PrintASCII(const Unit &U, const char *PrintAfter) {
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PrintASCII(U.data(), U.size(), PrintAfter);
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}
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std::string Sha1ToString(const uint8_t Sha1[kSHA1NumBytes]) {
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std::stringstream SS;
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for (int i = 0; i < kSHA1NumBytes; i++)
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SS << std::hex << std::setfill('0') << std::setw(2) << (unsigned)Sha1[i];
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return SS.str();
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}
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std::string Hash(const Unit &U) {
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uint8_t Hash[kSHA1NumBytes];
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ComputeSHA1(U.data(), U.size(), Hash);
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return Sha1ToString(Hash);
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}
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static void AlarmHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticAlarmCallback();
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}
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static void CrashHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticCrashSignalCallback();
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}
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static void InterruptHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticInterruptCallback();
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}
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static void SetSigaction(int signum,
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void (*callback)(int, siginfo_t *, void *)) {
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struct sigaction sigact;
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memset(&sigact, 0, sizeof(sigact));
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sigact.sa_sigaction = callback;
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if (sigaction(signum, &sigact, 0)) {
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Printf("libFuzzer: sigaction failed with %d\n", errno);
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exit(1);
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}
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}
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void SetTimer(int Seconds) {
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struct itimerval T {{Seconds, 0}, {Seconds, 0}};
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if (setitimer(ITIMER_REAL, &T, nullptr)) {
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Printf("libFuzzer: setitimer failed with %d\n", errno);
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exit(1);
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}
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SetSigaction(SIGALRM, AlarmHandler);
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}
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void SetSigSegvHandler() { SetSigaction(SIGSEGV, CrashHandler); }
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void SetSigBusHandler() { SetSigaction(SIGBUS, CrashHandler); }
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void SetSigAbrtHandler() { SetSigaction(SIGABRT, CrashHandler); }
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void SetSigIllHandler() { SetSigaction(SIGILL, CrashHandler); }
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void SetSigFpeHandler() { SetSigaction(SIGFPE, CrashHandler); }
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void SetSigIntHandler() { SetSigaction(SIGINT, InterruptHandler); }
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void SetSigTermHandler() { SetSigaction(SIGTERM, InterruptHandler); }
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int NumberOfCpuCores() {
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const char *CmdLine = nullptr;
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if (LIBFUZZER_LINUX) {
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CmdLine = "nproc";
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} else if (LIBFUZZER_APPLE) {
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CmdLine = "sysctl -n hw.ncpu";
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} else {
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assert(0 && "NumberOfCpuCores() is not implemented for your platform");
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}
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FILE *F = popen(CmdLine, "r");
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int N = 1;
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if (!F || fscanf(F, "%d", &N) != 1) {
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Printf("WARNING: Failed to parse output of command \"%s\" in %s(). "
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"Assuming CPU count of 1.\n",
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CmdLine, __func__);
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N = 1;
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}
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if (pclose(F)) {
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Printf("WARNING: Executing command \"%s\" failed in %s(). "
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"Assuming CPU count of 1.\n",
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CmdLine, __func__);
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N = 1;
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}
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if (N < 1) {
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Printf("WARNING: Reported CPU count (%d) from command \"%s\" was invalid "
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"in %s(). Assuming CPU count of 1.\n",
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N, CmdLine, __func__);
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N = 1;
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}
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return N;
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}
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bool ToASCII(uint8_t *Data, size_t Size) {
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bool Changed = false;
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for (size_t i = 0; i < Size; i++) {
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uint8_t &X = Data[i];
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auto NewX = X;
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NewX &= 127;
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if (!isspace(NewX) && !isprint(NewX))
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NewX = ' ';
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Changed |= NewX != X;
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X = NewX;
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}
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return Changed;
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}
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bool IsASCII(const Unit &U) { return IsASCII(U.data(), U.size()); }
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bool IsASCII(const uint8_t *Data, size_t Size) {
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for (size_t i = 0; i < Size; i++)
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if (!(isprint(Data[i]) || isspace(Data[i]))) return false;
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return true;
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}
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bool ParseOneDictionaryEntry(const std::string &Str, Unit *U) {
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U->clear();
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if (Str.empty()) return false;
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size_t L = 0, R = Str.size() - 1; // We are parsing the range [L,R].
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// Skip spaces from both sides.
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while (L < R && isspace(Str[L])) L++;
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while (R > L && isspace(Str[R])) R--;
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if (R - L < 2) return false;
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// Check the closing "
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if (Str[R] != '"') return false;
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R--;
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// Find the opening "
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while (L < R && Str[L] != '"') L++;
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if (L >= R) return false;
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assert(Str[L] == '\"');
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L++;
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assert(L <= R);
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for (size_t Pos = L; Pos <= R; Pos++) {
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uint8_t V = (uint8_t)Str[Pos];
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if (!isprint(V) && !isspace(V)) return false;
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if (V =='\\') {
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// Handle '\\'
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if (Pos + 1 <= R && (Str[Pos + 1] == '\\' || Str[Pos + 1] == '"')) {
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U->push_back(Str[Pos + 1]);
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Pos++;
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continue;
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}
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// Handle '\xAB'
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if (Pos + 3 <= R && Str[Pos + 1] == 'x'
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&& isxdigit(Str[Pos + 2]) && isxdigit(Str[Pos + 3])) {
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char Hex[] = "0xAA";
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Hex[2] = Str[Pos + 2];
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Hex[3] = Str[Pos + 3];
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U->push_back(strtol(Hex, nullptr, 16));
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Pos += 3;
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continue;
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}
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return false; // Invalid escape.
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} else {
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// Any other character.
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U->push_back(V);
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}
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}
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return true;
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}
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bool ParseDictionaryFile(const std::string &Text, std::vector<Unit> *Units) {
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if (Text.empty()) {
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Printf("ParseDictionaryFile: file does not exist or is empty\n");
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return false;
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}
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std::istringstream ISS(Text);
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Units->clear();
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Unit U;
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int LineNo = 0;
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std::string S;
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while (std::getline(ISS, S, '\n')) {
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LineNo++;
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size_t Pos = 0;
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while (Pos < S.size() && isspace(S[Pos])) Pos++; // Skip spaces.
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if (Pos == S.size()) continue; // Empty line.
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if (S[Pos] == '#') continue; // Comment line.
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if (ParseOneDictionaryEntry(S, &U)) {
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Units->push_back(U);
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} else {
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Printf("ParseDictionaryFile: error in line %d\n\t\t%s\n", LineNo,
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S.c_str());
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return false;
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}
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}
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return true;
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}
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void SleepSeconds(int Seconds) {
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sleep(Seconds); // Use C API to avoid coverage from instrumented libc++.
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}
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int GetPid() { return getpid(); }
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std::string Base64(const Unit &U) {
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static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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std::string Res;
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size_t i;
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for (i = 0; i + 2 < U.size(); i += 3) {
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uint32_t x = (U[i] << 16) + (U[i + 1] << 8) + U[i + 2];
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Res += Table[(x >> 18) & 63];
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Res += Table[(x >> 12) & 63];
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Res += Table[(x >> 6) & 63];
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Res += Table[x & 63];
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}
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if (i + 1 == U.size()) {
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uint32_t x = (U[i] << 16);
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Res += Table[(x >> 18) & 63];
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Res += Table[(x >> 12) & 63];
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Res += "==";
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} else if (i + 2 == U.size()) {
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uint32_t x = (U[i] << 16) + (U[i + 1] << 8);
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Res += Table[(x >> 18) & 63];
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Res += Table[(x >> 12) & 63];
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Res += Table[(x >> 6) & 63];
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Res += "=";
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}
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return Res;
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}
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size_t GetPeakRSSMb() {
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struct rusage usage;
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if (getrusage(RUSAGE_SELF, &usage))
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return 0;
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if (LIBFUZZER_LINUX) {
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// ru_maxrss is in KiB
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return usage.ru_maxrss >> 10;
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} else if (LIBFUZZER_APPLE) {
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// ru_maxrss is in bytes
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return usage.ru_maxrss >> 20;
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}
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assert(0 && "GetPeakRSSMb() is not implemented for your platform");
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return 0;
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}
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std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC) {
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if (!EF->__sanitizer_symbolize_pc) return "<can not symbolize>";
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char PcDescr[1024];
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EF->__sanitizer_symbolize_pc(reinterpret_cast<void*>(PC),
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SymbolizedFMT, PcDescr, sizeof(PcDescr));
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PcDescr[sizeof(PcDescr) - 1] = 0; // Just in case.
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return PcDescr;
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}
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void PrintPC(const char *SymbolizedFMT, const char *FallbackFMT, uintptr_t PC) {
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if (EF->__sanitizer_symbolize_pc)
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Printf("%s", DescribePC(SymbolizedFMT, PC).c_str());
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else
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Printf(FallbackFMT, PC);
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}
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} // namespace fuzzer
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