aboutsummaryrefslogtreecommitdiffstats
path: root/lib/fuzzer/FuzzerUtilWindows.cpp
blob: 074e1eb423094ca5492b64a6527f64d116bdb918 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
//===- FuzzerUtilWindows.cpp - Misc utils for Windows. --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Misc utils implementation for Windows.
//===----------------------------------------------------------------------===//
#include "FuzzerDefs.h"
#if LIBFUZZER_WINDOWS
#include "FuzzerCommand.h"
#include "FuzzerIO.h"
#include "FuzzerInternal.h"
#include <cassert>
#include <chrono>
#include <cstring>
#include <errno.h>
#include <iomanip>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <windows.h>

// This must be included after windows.h.
#include <psapi.h>

namespace fuzzer {

static const FuzzingOptions* HandlerOpt = nullptr;

static LONG CALLBACK ExceptionHandler(PEXCEPTION_POINTERS ExceptionInfo) {
  switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
    case EXCEPTION_ACCESS_VIOLATION:
    case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
    case EXCEPTION_STACK_OVERFLOW:
      if (HandlerOpt->HandleSegv)
        Fuzzer::StaticCrashSignalCallback();
      break;
    case EXCEPTION_DATATYPE_MISALIGNMENT:
    case EXCEPTION_IN_PAGE_ERROR:
      if (HandlerOpt->HandleBus)
        Fuzzer::StaticCrashSignalCallback();
      break;
    case EXCEPTION_ILLEGAL_INSTRUCTION:
    case EXCEPTION_PRIV_INSTRUCTION:
      if (HandlerOpt->HandleIll)
        Fuzzer::StaticCrashSignalCallback();
      break;
    case EXCEPTION_FLT_DENORMAL_OPERAND:
    case EXCEPTION_FLT_DIVIDE_BY_ZERO:
    case EXCEPTION_FLT_INEXACT_RESULT:
    case EXCEPTION_FLT_INVALID_OPERATION:
    case EXCEPTION_FLT_OVERFLOW:
    case EXCEPTION_FLT_STACK_CHECK:
    case EXCEPTION_FLT_UNDERFLOW:
    case EXCEPTION_INT_DIVIDE_BY_ZERO:
    case EXCEPTION_INT_OVERFLOW:
      if (HandlerOpt->HandleFpe)
        Fuzzer::StaticCrashSignalCallback();
      break;
    // TODO: handle (Options.HandleXfsz)
  }
  return EXCEPTION_CONTINUE_SEARCH;
}

BOOL WINAPI CtrlHandler(DWORD dwCtrlType) {
  switch (dwCtrlType) {
    case CTRL_C_EVENT:
      if (HandlerOpt->HandleInt)
        Fuzzer::StaticInterruptCallback();
      return TRUE;
    case CTRL_BREAK_EVENT:
      if (HandlerOpt->HandleTerm)
        Fuzzer::StaticInterruptCallback();
      return TRUE;
  }
  return FALSE;
}

void CALLBACK AlarmHandler(PVOID, BOOLEAN) {
  Fuzzer::StaticAlarmCallback();
}

class TimerQ {
  HANDLE TimerQueue;
 public:
  TimerQ() : TimerQueue(NULL) {}
  ~TimerQ() {
    if (TimerQueue)
      DeleteTimerQueueEx(TimerQueue, NULL);
  }
  void SetTimer(int Seconds) {
    if (!TimerQueue) {
      TimerQueue = CreateTimerQueue();
      if (!TimerQueue) {
        Printf("libFuzzer: CreateTimerQueue failed.\n");
        exit(1);
      }
    }
    HANDLE Timer;
    if (!CreateTimerQueueTimer(&Timer, TimerQueue, AlarmHandler, NULL,
        Seconds*1000, Seconds*1000, 0)) {
      Printf("libFuzzer: CreateTimerQueueTimer failed.\n");
      exit(1);
    }
  }
};

static TimerQ Timer;

static void CrashHandler(int) { Fuzzer::StaticCrashSignalCallback(); }

bool Mprotect(void *Ptr, size_t Size, bool AllowReadWrite) {
  return false;  // UNIMPLEMENTED
}

void SetSignalHandler(const FuzzingOptions& Options) {
  HandlerOpt = &Options;

  if (Options.UnitTimeoutSec > 0)
    Timer.SetTimer(Options.UnitTimeoutSec / 2 + 1);

  if (Options.HandleInt || Options.HandleTerm)
    if (!SetConsoleCtrlHandler(CtrlHandler, TRUE)) {
      DWORD LastError = GetLastError();
      Printf("libFuzzer: SetConsoleCtrlHandler failed (Error code: %lu).\n",
        LastError);
      exit(1);
    }

  if (Options.HandleSegv || Options.HandleBus || Options.HandleIll ||
      Options.HandleFpe)
    SetUnhandledExceptionFilter(ExceptionHandler);

  if (Options.HandleAbrt)
    if (SIG_ERR == signal(SIGABRT, CrashHandler)) {
      Printf("libFuzzer: signal failed with %d\n", errno);
      exit(1);
    }
}

void SleepSeconds(int Seconds) { Sleep(Seconds * 1000); }

unsigned long GetPid() { return GetCurrentProcessId(); }

size_t GetPeakRSSMb() {
  PROCESS_MEMORY_COUNTERS info;
  if (!GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info)))
    return 0;
  return info.PeakWorkingSetSize >> 20;
}

FILE *OpenProcessPipe(const char *Command, const char *Mode) {
  return _popen(Command, Mode);
}

int ExecuteCommand(const Command &Cmd) {
  std::string CmdLine = Cmd.toString();
  return system(CmdLine.c_str());
}

const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
                         size_t PattLen) {
  // TODO: make this implementation more efficient.
  const char *Cdata = (const char *)Data;
  const char *Cpatt = (const char *)Patt;

  if (!Data || !Patt || DataLen == 0 || PattLen == 0 || DataLen < PattLen)
    return NULL;

  if (PattLen == 1)
    return memchr(Data, *Cpatt, DataLen);

  const char *End = Cdata + DataLen - PattLen + 1;

  for (const char *It = Cdata; It < End; ++It)
    if (It[0] == Cpatt[0] && memcmp(It, Cpatt, PattLen) == 0)
      return It;

  return NULL;
}

std::string DisassembleCmd(const std::string &FileName) {
  Vector<std::string> command_vector;
  command_vector.push_back("dumpbin /summary > nul");
  if (ExecuteCommand(Command(command_vector)) == 0)
    return "dumpbin /disasm " + FileName;
  Printf("libFuzzer: couldn't find tool to disassemble (dumpbin)\n");
  exit(1);
}

std::string SearchRegexCmd(const std::string &Regex) {
  return "findstr /r \"" + Regex + "\"";
}

} // namespace fuzzer

#endif // LIBFUZZER_WINDOWS