145 lines
3.8 KiB
C++
145 lines
3.8 KiB
C++
//===- FuzzerUtilPosix.cpp - Misc utils for Posix. ------------------------===//
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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 implementation using Posix API.
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//===----------------------------------------------------------------------===//
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#include "FuzzerDefs.h"
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#if LIBFUZZER_POSIX
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#include "FuzzerIO.h"
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#include "FuzzerInternal.h"
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#include <cassert>
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#include <chrono>
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#include <cstring>
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#include <errno.h>
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#include <iomanip>
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#include <signal.h>
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#include <sstream>
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#include <stdio.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <thread>
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#include <unistd.h>
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namespace fuzzer {
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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 FileSizeExceedHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticFileSizeExceedCallback();
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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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if (sigaction(signum, nullptr, &sigact)) {
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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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if (sigact.sa_flags & SA_SIGINFO) {
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if (sigact.sa_sigaction)
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return;
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} else {
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if (sigact.sa_handler != SIG_DFL && sigact.sa_handler != SIG_IGN &&
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sigact.sa_handler != SIG_ERR)
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return;
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}
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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 {
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{Seconds, 0}, { Seconds, 0 }
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};
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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 SetSignalHandler(const FuzzingOptions& Options) {
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if (Options.UnitTimeoutSec > 0)
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SetTimer(Options.UnitTimeoutSec / 2 + 1);
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if (Options.HandleInt)
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SetSigaction(SIGINT, InterruptHandler);
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if (Options.HandleTerm)
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SetSigaction(SIGTERM, InterruptHandler);
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if (Options.HandleSegv)
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SetSigaction(SIGSEGV, CrashHandler);
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if (Options.HandleBus)
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SetSigaction(SIGBUS, CrashHandler);
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if (Options.HandleAbrt)
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SetSigaction(SIGABRT, CrashHandler);
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if (Options.HandleIll)
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SetSigaction(SIGILL, CrashHandler);
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if (Options.HandleFpe)
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SetSigaction(SIGFPE, CrashHandler);
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if (Options.HandleXfsz)
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SetSigaction(SIGXFSZ, FileSizeExceedHandler);
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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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unsigned long GetPid() { return (unsigned long)getpid(); }
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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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FILE *OpenProcessPipe(const char *Command, const char *Mode) {
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return popen(Command, Mode);
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}
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const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
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size_t PattLen) {
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return memmem(Data, DataLen, Patt, PattLen);
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}
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std::string DisassembleCmd(const std::string &FileName) {
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return "objdump -d " + FileName;
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}
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std::string SearchRegexCmd(const std::string &Regex) {
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return "grep '" + Regex + "'";
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}
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} // namespace fuzzer
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#endif // LIBFUZZER_POSIX
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