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//===- FuzzerUtilWindows.cpp - Misc utils for Windows. --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Misc utils implementation for Windows.
//===----------------------------------------------------------------------===//
#include "FuzzerPlatform.h"
#if LIBFUZZER_WINDOWS
#include "FuzzerCommand.h"
#include "FuzzerIO.h"
#include "FuzzerInternal.h"
#include <cassert>
#include <chrono>
#include <cstring>
#include <errno.h>
#include <io.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(); }
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 CloseProcessPipe(FILE *F) {
return _pclose(F);
}
int ExecuteCommand(const Command &Cmd) {
std::string CmdLine = Cmd.toString();
return system(CmdLine.c_str());
}
bool ExecuteCommand(const Command &Cmd, std::string *CmdOutput) {
FILE *Pipe = _popen(Cmd.toString().c_str(), "r");
if (!Pipe)
return false;
if (CmdOutput) {
char TmpBuffer[128];
while (fgets(TmpBuffer, sizeof(TmpBuffer), Pipe))
CmdOutput->append(TmpBuffer);
}
return _pclose(Pipe) == 0;
}
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 + "\"";
}
void DiscardOutput(int Fd) {
FILE* Temp = fopen("nul", "w");
if (!Temp)
return;
_dup2(_fileno(Temp), Fd);
fclose(Temp);
}
} // namespace fuzzer
#endif // LIBFUZZER_WINDOWS