[llvm] r288549 - Resubmit "[LibFuzzer] Split FuzzerUtil for Posix and Windows."
Zachary Turner via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 2 15:02:01 PST 2016
Author: zturner
Date: Fri Dec 2 17:02:01 2016
New Revision: 288549
URL: http://llvm.org/viewvc/llvm-project?rev=288549&view=rev
Log:
Resubmit "[LibFuzzer] Split FuzzerUtil for Posix and Windows."
This resubmits r288529, which was resubmitted because it broke a
fuzzer bot. According to kcc@ the test that broke was flakey
and it is unlikely to be a result of this patch.
Added:
llvm/trunk/lib/Fuzzer/FuzzerUtilPosix.cpp
llvm/trunk/lib/Fuzzer/FuzzerUtilWindows.cpp
Modified:
llvm/trunk/lib/Fuzzer/CMakeLists.txt
llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp
llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp
llvm/trunk/lib/Fuzzer/FuzzerTraceState.cpp
llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp
llvm/trunk/lib/Fuzzer/FuzzerUtil.h
Modified: llvm/trunk/lib/Fuzzer/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/CMakeLists.txt?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/CMakeLists.txt (original)
+++ llvm/trunk/lib/Fuzzer/CMakeLists.txt Fri Dec 2 17:02:01 2016
@@ -25,6 +25,8 @@ if( LLVM_USE_SANITIZE_COVERAGE )
FuzzerUtil.cpp
FuzzerUtilDarwin.cpp
FuzzerUtilLinux.cpp
+ FuzzerUtilPosix.cpp
+ FuzzerUtilWindows.cpp
)
add_library(LLVMFuzzerNoMain STATIC
$<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
Modified: llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerDriver.cpp Fri Dec 2 17:02:01 2016
@@ -23,7 +23,6 @@
#include <mutex>
#include <string>
#include <thread>
-#include <unistd.h>
// This function should be present in the libFuzzer so that the client
// binary can test for its existence.
@@ -442,7 +441,7 @@ int FuzzerDriver(int *argc, char ***argv
// Initialize Seed.
if (Seed == 0)
Seed = (std::chrono::system_clock::now().time_since_epoch().count() << 10) +
- getpid();
+ GetPid();
if (Flags.verbosity)
Printf("INFO: Seed: %u\n", Seed);
Modified: llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerMutate.cpp Fri Dec 2 17:02:01 2016
@@ -221,7 +221,7 @@ DictionaryEntry MutationDispatcher::Make
size_t NumPositions = 0;
for (const uint8_t *Cur = Data;
Cur < End && NumPositions < kMaxNumPositions; Cur++) {
- Cur = (uint8_t *)memmem(Cur, End - Cur, &ExistingBytes, sizeof(T));
+ Cur = (uint8_t *)SearchMemory(Cur, End - Cur, &ExistingBytes, sizeof(T));
if (!Cur) break;
Positions[NumPositions++] = Cur - Data;
}
Modified: llvm/trunk/lib/Fuzzer/FuzzerTraceState.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerTraceState.cpp?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerTraceState.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerTraceState.cpp Fri Dec 2 17:02:01 2016
@@ -157,7 +157,7 @@ int TraceState::TryToAddDesiredData(uint
const uint8_t *Beg = UnitData;
const uint8_t *End = Beg + UnitSize;
for (const uint8_t *Cur = Beg; Cur < End; Cur++) {
- Cur = (uint8_t *)memmem(Cur, End - Cur, &PresentData, DataSize);
+ Cur = (uint8_t *)SearchMemory(Cur, End - Cur, &PresentData, DataSize);
if (!Cur)
break;
size_t Pos = Cur - Beg;
@@ -181,7 +181,7 @@ int TraceState::TryToAddDesiredData(cons
const uint8_t *Beg = UnitData;
const uint8_t *End = Beg + UnitSize;
for (const uint8_t *Cur = Beg; Cur < End; Cur++) {
- Cur = (uint8_t *)memmem(Cur, End - Cur, PresentData, DataSize);
+ Cur = (uint8_t *)SearchMemory(Cur, End - Cur, PresentData, DataSize);
if (!Cur)
break;
size_t Pos = Cur - Beg;
Modified: llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerUtil.cpp Fri Dec 2 17:02:01 2016
@@ -10,22 +10,16 @@
//===----------------------------------------------------------------------===//
#include "FuzzerUtil.h"
-#include "FuzzerInternal.h"
#include "FuzzerIO.h"
-#include <sstream>
-#include <iomanip>
-#include <sys/resource.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/syscall.h>
+#include "FuzzerInternal.h"
#include <cassert>
#include <chrono>
#include <cstring>
-#include <stdio.h>
+#include <errno.h>
#include <signal.h>
#include <sstream>
-#include <unistd.h>
-#include <errno.h>
+#include <stdio.h>
+#include <sys/types.h>
#include <thread>
namespace fuzzer {
@@ -62,80 +56,6 @@ void PrintASCII(const Unit &U, const cha
PrintASCII(U.data(), U.size(), PrintAfter);
}
-static void AlarmHandler(int, siginfo_t *, void *) {
- Fuzzer::StaticAlarmCallback();
-}
-
-static void CrashHandler(int, siginfo_t *, void *) {
- Fuzzer::StaticCrashSignalCallback();
-}
-
-static void InterruptHandler(int, siginfo_t *, void *) {
- Fuzzer::StaticInterruptCallback();
-}
-
-static void SetSigaction(int signum,
- void (*callback)(int, siginfo_t *, void *)) {
- struct sigaction sigact;
- memset(&sigact, 0, sizeof(sigact));
- sigact.sa_sigaction = callback;
- if (sigaction(signum, &sigact, 0)) {
- Printf("libFuzzer: sigaction failed with %d\n", errno);
- exit(1);
- }
-}
-
-void SetTimer(int Seconds) {
- struct itimerval T {{Seconds, 0}, {Seconds, 0}};
- if (setitimer(ITIMER_REAL, &T, nullptr)) {
- Printf("libFuzzer: setitimer failed with %d\n", errno);
- exit(1);
- }
- SetSigaction(SIGALRM, AlarmHandler);
-}
-
-void SetSigSegvHandler() { SetSigaction(SIGSEGV, CrashHandler); }
-void SetSigBusHandler() { SetSigaction(SIGBUS, CrashHandler); }
-void SetSigAbrtHandler() { SetSigaction(SIGABRT, CrashHandler); }
-void SetSigIllHandler() { SetSigaction(SIGILL, CrashHandler); }
-void SetSigFpeHandler() { SetSigaction(SIGFPE, CrashHandler); }
-void SetSigIntHandler() { SetSigaction(SIGINT, InterruptHandler); }
-void SetSigTermHandler() { SetSigaction(SIGTERM, InterruptHandler); }
-
-int NumberOfCpuCores() {
- const char *CmdLine = nullptr;
- if (LIBFUZZER_LINUX) {
- CmdLine = "nproc";
- } else if (LIBFUZZER_APPLE) {
- CmdLine = "sysctl -n hw.ncpu";
- } else {
- assert(0 && "NumberOfCpuCores() is not implemented for your platform");
- }
-
- FILE *F = popen(CmdLine, "r");
- int N = 1;
- if (!F || fscanf(F, "%d", &N) != 1) {
- Printf("WARNING: Failed to parse output of command \"%s\" in %s(). "
- "Assuming CPU count of 1.\n",
- CmdLine, __func__);
- N = 1;
- }
-
- if (pclose(F)) {
- Printf("WARNING: Executing command \"%s\" failed in %s(). "
- "Assuming CPU count of 1.\n",
- CmdLine, __func__);
- N = 1;
- }
- if (N < 1) {
- Printf("WARNING: Reported CPU count (%d) from command \"%s\" was invalid "
- "in %s(). Assuming CPU count of 1.\n",
- N, CmdLine, __func__);
- N = 1;
- }
- return N;
-}
-
bool ToASCII(uint8_t *Data, size_t Size) {
bool Changed = false;
for (size_t i = 0; i < Size; i++) {
@@ -231,12 +151,6 @@ bool ParseDictionaryFile(const std::stri
return true;
}
-void SleepSeconds(int Seconds) {
- sleep(Seconds); // Use C API to avoid coverage from instrumented libc++.
-}
-
-int GetPid() { return getpid(); }
-
std::string Base64(const Unit &U) {
static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
@@ -265,21 +179,6 @@ std::string Base64(const Unit &U) {
return Res;
}
-size_t GetPeakRSSMb() {
- struct rusage usage;
- if (getrusage(RUSAGE_SELF, &usage))
- return 0;
- if (LIBFUZZER_LINUX) {
- // ru_maxrss is in KiB
- return usage.ru_maxrss >> 10;
- } else if (LIBFUZZER_APPLE) {
- // ru_maxrss is in bytes
- return usage.ru_maxrss >> 20;
- }
- assert(0 && "GetPeakRSSMb() is not implemented for your platform");
- return 0;
-}
-
std::string DescribePC(const char *SymbolizedFMT, uintptr_t PC) {
if (!EF->__sanitizer_symbolize_pc) return "<can not symbolize>";
char PcDescr[1024];
@@ -296,8 +195,18 @@ void PrintPC(const char *SymbolizedFMT,
Printf(FallbackFMT, PC);
}
+int NumberOfCpuCores() {
+ unsigned N = std::thread::hardware_concurrency();
+ if (!N) {
+ Printf("WARNING: std::thread::hardware_concurrency not well defined for "
+ "your platform. Assuming CPU count of 1.\n");
+ N = 1;
+ }
+ return N;
+}
+
bool ExecuteCommandAndReadOutput(const std::string &Command, std::string *Out) {
- FILE *Pipe = popen(Command.c_str(), "r");
+ FILE *Pipe = OpenProcessPipe(Command.c_str(), "r");
if (!Pipe) return false;
char Buff[1024];
size_t N;
Modified: llvm/trunk/lib/Fuzzer/FuzzerUtil.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtil.h?rev=288549&r1=288548&r2=288549&view=diff
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerUtil.h (original)
+++ llvm/trunk/lib/Fuzzer/FuzzerUtil.h Fri Dec 2 17:02:01 2016
@@ -40,6 +40,8 @@ std::string DescribePC(const char *Symbo
int NumberOfCpuCores();
+bool ExecuteCommandAndReadOutput(const std::string &Command, std::string *Out);
+
// Platform specific functions.
void SetTimer(int Seconds);
@@ -57,9 +59,12 @@ int GetPid();
size_t GetPeakRSSMb();
-bool ExecuteCommandAndReadOutput(const std::string &Command, std::string *Out);
-
int ExecuteCommand(const std::string &Command);
+FILE *OpenProcessPipe(const char *Command, const char *Mode);
+
+const void *SearchMemory(const void *haystack, size_t haystacklen,
+ const void *needle, size_t needlelen);
+
} // namespace fuzzer
#endif // LLVM_FUZZER_UTIL_H
Added: llvm/trunk/lib/Fuzzer/FuzzerUtilPosix.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtilPosix.cpp?rev=288549&view=auto
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerUtilPosix.cpp (added)
+++ llvm/trunk/lib/Fuzzer/FuzzerUtilPosix.cpp Fri Dec 2 17:02:01 2016
@@ -0,0 +1,106 @@
+//===- FuzzerUtilPosix.cpp - Misc utils for Posix. ------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Misc utils implementation using Posix API.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#if LIBFUZZER_POSIX
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include <cassert>
+#include <chrono>
+#include <cstring>
+#include <errno.h>
+#include <iomanip>
+#include <signal.h>
+#include <sstream>
+#include <stdio.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <thread>
+#include <unistd.h>
+
+namespace fuzzer {
+
+static void AlarmHandler(int, siginfo_t *, void *) {
+ Fuzzer::StaticAlarmCallback();
+}
+
+static void CrashHandler(int, siginfo_t *, void *) {
+ Fuzzer::StaticCrashSignalCallback();
+}
+
+static void InterruptHandler(int, siginfo_t *, void *) {
+ Fuzzer::StaticInterruptCallback();
+}
+
+static void SetSigaction(int signum,
+ void (*callback)(int, siginfo_t *, void *)) {
+ struct sigaction sigact;
+ memset(&sigact, 0, sizeof(sigact));
+ sigact.sa_sigaction = callback;
+ if (sigaction(signum, &sigact, 0)) {
+ Printf("libFuzzer: sigaction failed with %d\n", errno);
+ exit(1);
+ }
+}
+
+void SetTimer(int Seconds) {
+ struct itimerval T {
+ {Seconds, 0}, { Seconds, 0 }
+ };
+ if (setitimer(ITIMER_REAL, &T, nullptr)) {
+ Printf("libFuzzer: setitimer failed with %d\n", errno);
+ exit(1);
+ }
+ SetSigaction(SIGALRM, AlarmHandler);
+}
+
+void SetSigSegvHandler() { SetSigaction(SIGSEGV, CrashHandler); }
+void SetSigBusHandler() { SetSigaction(SIGBUS, CrashHandler); }
+void SetSigAbrtHandler() { SetSigaction(SIGABRT, CrashHandler); }
+void SetSigIllHandler() { SetSigaction(SIGILL, CrashHandler); }
+void SetSigFpeHandler() { SetSigaction(SIGFPE, CrashHandler); }
+void SetSigIntHandler() { SetSigaction(SIGINT, InterruptHandler); }
+void SetSigTermHandler() { SetSigaction(SIGTERM, InterruptHandler); }
+
+void SleepSeconds(int Seconds) {
+ sleep(Seconds); // Use C API to avoid coverage from instrumented libc++.
+}
+
+int GetPid() { return getpid(); }
+
+size_t GetPeakRSSMb() {
+ struct rusage usage;
+ if (getrusage(RUSAGE_SELF, &usage))
+ return 0;
+ if (LIBFUZZER_LINUX) {
+ // ru_maxrss is in KiB
+ return usage.ru_maxrss >> 10;
+ } else if (LIBFUZZER_APPLE) {
+ // ru_maxrss is in bytes
+ return usage.ru_maxrss >> 20;
+ }
+ assert(0 && "GetPeakRSSMb() is not implemented for your platform");
+ return 0;
+}
+
+FILE *OpenProcessPipe(const char *Command, const char *Mode) {
+ return popen(Command, Mode);
+}
+
+const void *SearchMemory(const void *Data, size_t DataLen, const void *Patt,
+ size_t PattLen) {
+ return memmem(Data, DataLen, Patt, PattLen);
+}
+
+} // namespace fuzzer
+#endif // LIBFUZZER_POSIX
Added: llvm/trunk/lib/Fuzzer/FuzzerUtilWindows.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Fuzzer/FuzzerUtilWindows.cpp?rev=288549&view=auto
==============================================================================
--- llvm/trunk/lib/Fuzzer/FuzzerUtilWindows.cpp (added)
+++ llvm/trunk/lib/Fuzzer/FuzzerUtilWindows.cpp Fri Dec 2 17:02:01 2016
@@ -0,0 +1,194 @@
+//===- FuzzerUtilWindows.cpp - Misc utils for Windows. --------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Misc utils implementation for Windows.
+//===----------------------------------------------------------------------===//
+
+#include "FuzzerDefs.h"
+#if LIBFUZZER_WINDOWS
+#include "FuzzerIO.h"
+#include "FuzzerInternal.h"
+#include <Psapi.h>
+#include <cassert>
+#include <chrono>
+#include <cstring>
+#include <errno.h>
+#include <iomanip>
+#include <signal.h>
+#include <sstream>
+#include <stdio.h>
+#include <sys/types.h>
+#include <windows.h>
+
+namespace fuzzer {
+
+LONG WINAPI SEGVHandler(PEXCEPTION_POINTERS ExceptionInfo) {
+ switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
+ case EXCEPTION_ACCESS_VIOLATION:
+ case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
+ case EXCEPTION_STACK_OVERFLOW:
+ Fuzzer::StaticCrashSignalCallback();
+ break;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+LONG WINAPI BUSHandler(PEXCEPTION_POINTERS ExceptionInfo) {
+ switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
+ case EXCEPTION_DATATYPE_MISALIGNMENT:
+ case EXCEPTION_IN_PAGE_ERROR:
+ Fuzzer::StaticCrashSignalCallback();
+ break;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+LONG WINAPI ILLHandler(PEXCEPTION_POINTERS ExceptionInfo) {
+ switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
+ case EXCEPTION_ILLEGAL_INSTRUCTION:
+ case EXCEPTION_PRIV_INSTRUCTION:
+ Fuzzer::StaticCrashSignalCallback();
+ break;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+LONG WINAPI FPEHandler(PEXCEPTION_POINTERS ExceptionInfo) {
+ switch (ExceptionInfo->ExceptionRecord->ExceptionCode) {
+ 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:
+ Fuzzer::StaticCrashSignalCallback();
+ break;
+ }
+ return EXCEPTION_CONTINUE_SEARCH;
+}
+
+BOOL WINAPI INTHandler(DWORD dwCtrlType) {
+ switch (dwCtrlType) {
+ case CTRL_C_EVENT:
+ Fuzzer::StaticInterruptCallback();
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+BOOL WINAPI TERMHandler(DWORD dwCtrlType) {
+ switch (dwCtrlType) {
+ case CTRL_BREAK_EVENT:
+ Fuzzer::StaticInterruptCallback();
+ return TRUE;
+ default:
+ return FALSE;
+ }
+}
+
+void SetTimer(int Seconds) {
+ // TODO: Complete this implementation.
+ return;
+}
+
+void SetSigSegvHandler() {
+ if (!AddVectoredExceptionHandler(1, SEGVHandler)) {
+ Printf("libFuzzer: AddVectoredExceptionHandler failed.\n");
+ exit(1);
+ }
+}
+
+void SetSigBusHandler() {
+ if (!AddVectoredExceptionHandler(1, BUSHandler)) {
+ Printf("libFuzzer: AddVectoredExceptionHandler failed.\n");
+ exit(1);
+ }
+}
+
+static void CrashHandler(int) { Fuzzer::StaticCrashSignalCallback(); }
+
+void SetSigAbrtHandler() { signal(SIGABRT, CrashHandler); }
+
+void SetSigIllHandler() {
+ if (!AddVectoredExceptionHandler(1, ILLHandler)) {
+ Printf("libFuzzer: AddVectoredExceptionHandler failed.\n");
+ exit(1);
+ }
+}
+
+void SetSigFpeHandler() {
+ if (!AddVectoredExceptionHandler(1, FPEHandler)) {
+ Printf("libFuzzer: AddVectoredExceptionHandler failed.\n");
+ exit(1);
+ }
+}
+
+void SetSigIntHandler() {
+ if (!SetConsoleCtrlHandler(INTHandler, TRUE)) {
+ DWORD LastError = GetLastError();
+ Printf("libFuzzer: SetConsoleCtrlHandler failed (Error code: %lu).\n",
+ LastError);
+ exit(1);
+ }
+}
+
+void SetSigTermHandler() {
+ if (!SetConsoleCtrlHandler(TERMHandler, TRUE)) {
+ DWORD LastError = GetLastError();
+ Printf("libFuzzer: SetConsoleCtrlHandler failed (Error code: %lu).\n",
+ LastError);
+ exit(1);
+ }
+}
+
+void SleepSeconds(int Seconds) { Sleep(Seconds * 1000); }
+
+int 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 std::string &Command) {
+ return system(Command.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;
+
+ for (const char *It = Cdata; It < End; ++It)
+ if (It[0] == Cpatt[0] && memcmp(It, Cpatt, PattLen) == 0)
+ return It;
+
+ return NULL;
+}
+
+} // namespace fuzzer
+#endif // LIBFUZZER_WINDOWS
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