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Merge commit 'dabc40cb19' as 'ext/detours'

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Andrzej Janik 2021-01-03 17:52:14 +01:00
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ext/detours/samples/excep/excep.cpp Normal file
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//////////////////////////////////////////////////////////////////////////////
//
// First Chance Exception Handling Test Program (excep.cpp of excep.exe)
//
// Microsoft Research Detours Package
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// For more information on exception handling, see "A Crash Course on the
// Depths of Win32 Structured Exception Handling," by Matt Pietrek in the
// January 1997 issue of Microsoft Systems Journal.
//
#include <stdio.h>
#include <windows.h>
#include <detours.h>
#include "firstexc.h"
//////////////////////////////////////////////////////////////////////////////
//
static LPVOID s_pvData = NULL;
static DWORD s_dwDataPerm = 0;
static LONG ExceptCatch(LONG nTry, DWORD dwException, LPEXCEPTION_POINTERS pinfo)
{
printf(" ExceptCatch(%ld, %08lx, %08lx)\n", nTry, dwException, (ULONG)pinfo);
#ifdef INCLUDE_THIS
if (nTry == 0) {
return EXCEPTION_CONTINUE_EXECUTION;
}
#endif
return EXCEPTION_EXECUTE_HANDLER;
}
static int BadCode(int nTry)
{
printf(" BadCode(Try:%d)\n", nTry);
printf(" BadCode -> %ld\n", *(PULONG)s_pvData);
((PULONG)s_pvData)[0] = 0;
printf(" BadCode -> %ld\n", *(PULONG)s_pvData);
((PULONG)s_pvData)[-1] = 0;
printf(" BadCode -> %ld\n", *(PULONG)s_pvData);
return 0;
}
void safe(int nTry)
{
__try {
printf(" try(%d)\n", nTry);
BadCode(nTry);
printf(" good(%d)\n", nTry);
} __except(ExceptCatch(nTry,
GetExceptionCode(),
GetExceptionInformation())) {
DWORD dwExcept = GetExceptionCode();
printf(" handler(%d) : %08lx\n", nTry, dwExcept);
}
}
void raw(int nTry)
{
BadCode(nTry);
}
LONG WINAPI MyVirtualFaultFilter(PEXCEPTION_POINTERS pException)
{
PEXCEPTION_RECORD pExceptRec = pException->ExceptionRecord;
if (pExceptRec->ExceptionCode == 0xc0000005) {
printf("-- Memory access exception.\n");
if (pExceptRec->NumberParameters >= 2 &&
pExceptRec->ExceptionInformation[1] >= (ULONG)s_pvData &&
pExceptRec->ExceptionInformation[1] <= (ULONG)s_pvData + sizeof(ULONG)) {
VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READWRITE, &s_dwDataPerm);
printf("-- Changed permissions.\n");
return EXCEPTION_CONTINUE_EXECUTION;
}
}
return EXCEPTION_CONTINUE_SEARCH;
}
int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hprev, LPSTR lpszCmdLine, int nCmdShow)
{
(void)hinst;
(void)hprev;
(void)lpszCmdLine;
(void)nCmdShow;
s_pvData = VirtualAlloc(NULL, sizeof(ULONG), MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
if (s_pvData == NULL) {
printf("VirtualAlloc failed: %ld\n", GetLastError());
return 0;
}
*(PULONG)s_pvData = 1;
VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READONLY, &s_dwDataPerm);
DetourFirstChanceExceptionFilter(MyVirtualFaultFilter);
printf("main\n");
printf("--------------------------------------------------\n");
int nTry = 0;
for (; nTry < 1; nTry++) {
// safe(nTry);
}
printf("-- safe ------------------------------------------\n");
safe(nTry);
VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READWRITE, &s_dwDataPerm);
*(PULONG)s_pvData = 1;
VirtualProtect(s_pvData, sizeof(ULONG), PAGE_READONLY, &s_dwDataPerm);
printf("-- raw -------------------------------------------\n");
printf("*\n");
printf("* NB: The second attempt to write will fail because it isn't handled.\n");
printf("*\n");
raw(nTry);
printf("--------------------------------------------------\n");
printf("exit\n");
return 0;
}
//
///////////////////////////////////////////////////////////////// End of File.