ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/test/thirdparty/Fuzzer/FuzzerUtilPosix.cpp

   1 //===- FuzzerUtilPosix.cpp - Misc utils for Posix. ------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 // Misc utils implementation using Posix API.
  10 //===----------------------------------------------------------------------===//
  11 #include "FuzzerDefs.h"
  12 #if LIBFUZZER_POSIX
  13 #include "FuzzerIO.h"
  14 #include "FuzzerInternal.h"
  15 #include <cassert>
  16 #include <chrono>
  17 #include <cstring>
  18 #include <errno.h>
  19 #include <iomanip>
  20 #include <signal.h>
  21 #include <sstream>
  22 #include <stdio.h>
  23 #include <sys/resource.h>
  24 #include <sys/syscall.h>
  25 #include <sys/time.h>
  26 #include <sys/types.h>
  27 #include <thread>
  28 #include <unistd.h>
  29
  30 namespace fuzzer {
  31
  32 static void AlarmHandler(int, siginfo_t *, void *) {
  33   Fuzzer::StaticAlarmCallback();
  34 }
  35
  36 static void CrashHandler(int, siginfo_t *, void *) {
  37   Fuzzer::StaticCrashSignalCallback();
  38 }
  39
  40 static void InterruptHandler(int, siginfo_t *, void *) {
  41   Fuzzer::StaticInterruptCallback();
  42 }
  43
  44 static void SetSigaction(int signum,
  45                          void (*callback)(int, siginfo_t *, void *)) {
  46   struct sigaction sigact;
  47   memset(&sigact, 0, sizeof(sigact));
  48   sigact.sa_sigaction = callback;
  49   if (sigaction(signum, &sigact, 0)) {
  50     Printf("libFuzzer: sigaction failed with %d\n", errno);
  51     exit(1);
  52   }
  53 }
  54
  55 void SetTimer(int Seconds) {
  56   struct itimerval T {
  57     {Seconds, 0}, { Seconds, 0 }
  58   };
  59   if (setitimer(ITIMER_REAL, &T, nullptr)) {
  60     Printf("libFuzzer: setitimer failed with %d\n", errno);
  61     exit(1);
  62   }
  63   SetSigaction(SIGALRM, AlarmHandler);
  64 }
  65
  66 void SetSignalHandler(const FuzzingOptions& Options) {
  67   if (Options.UnitTimeoutSec > 0)
  68     SetTimer(Options.UnitTimeoutSec / 2 + 1);
  69   if (Options.HandleInt)
  70     SetSigaction(SIGINT, InterruptHandler);
  71   if (Options.HandleTerm)
  72     SetSigaction(SIGTERM, InterruptHandler);
  73   if (Options.HandleSegv)
  74     SetSigaction(SIGSEGV, CrashHandler);
  75   if (Options.HandleBus)
  76     SetSigaction(SIGBUS, CrashHandler);
  77   if (Options.HandleAbrt)
  78     SetSigaction(SIGABRT, CrashHandler);
  79   if (Options.HandleIll)
  80     SetSigaction(SIGILL, CrashHandler);
  81   if (Options.HandleFpe)
  82     SetSigaction(SIGFPE, CrashHandler);
  83 }
  84
  85 void SleepSeconds(int Seconds) {
  86   sleep(Seconds); // Use C API to avoid coverage from instrumented libc++.
  87 }
  88
  89 unsigned long GetPid() { return (unsigned long)getpid(); }
  90
  91 size_t GetPeakRSSMb() {
  92   struct rusage usage;
  93   if (getrusage(RUSAGE_SELF, &usage))
  94     return 0;
  95   if (LIBFUZZER_LINUX) {
  96     // ru_maxrss is in KiB
  97     return usage.ru_maxrss >> 10;
  98   } else if (LIBFUZZER_APPLE) {
  99     // ru_maxrss is in bytes
 100     return usage.ru_maxrss >> 20;
 101   }
 102   assert(0 && "GetPeakRSSMb() is not implemented for your platform");
 103   return 0;
 104 }
 105
 106 FILE *OpenProcessPipe(const char *Command, const char *Mode) {
 107   return popen(Command, Mode);
 108 }
 109
 110 const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
 111                          size_t PattLen) {
 112   return memmem(Data, DataLen, Patt, PattLen);
 113 }
 114
 115 }  // namespace fuzzer
 116
 117 #endif // LIBFUZZER_POSIX