2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
//===- FuzzerUtilPosix.cpp - Misc utils for Posix. ------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 <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 GracefulExitHandler(int, siginfo_t *, void *) {
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Fuzzer::StaticGracefulExitCallback();
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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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if (Options.HandleUsr1)
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SetSigaction(SIGUSR1, GracefulExitHandler);
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if (Options.HandleUsr2)
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SetSigaction(SIGUSR2, GracefulExitHandler);
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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 || LIBFUZZER_FREEBSD || LIBFUZZER_NETBSD ||
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LIBFUZZER_OPENBSD) {
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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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