【发布时间】：2017-05-14 18:07:12
【问题描述】：
我正在尝试将硬件断点附加到游戏进程，但我成功了。然后我试图遍历异常并等待我放在那里的那个，它也可以正常工作。问题是它发生后进入无限循环，我无法刹车。你能建议吗？ 我这样做的原因是我想在此时停止线程，使用 Context 读取 EAX 值，然后继续该过程。
Header.h 包含此处调用的函数，它们都可以正常工作，因此我现在不包括它。
#include "Header.h" #包括
int main() {
SetDebugPrivilege(TRUE);
DWORD dwProcessID = 0;
DWORD dwGame = 0;
printf("Looking for game process...\n");
while (dwProcessID == 0) {
dwProcessID = GetProcessID(L"PathOfExile.exe");
if (dwProcessID != 0)
dwGame = 1;
Sleep(100);
}
printf("dwProcessID = %p\n", dwProcessID);
HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, dwProcessID);
MODULEENTRY32 module;
module.dwSize = sizeof(MODULEENTRY32);
Module32First(snapshot, &module);
printf("PoE base address = %p\n", module.modBaseAddr);
hpChangeBreakpoint = (DWORD*)((char *)module.modBaseAddr + 0x1AAD20);
std::cout << hpChangeBreakpoint << std::endl;
//hpChangeBreakpoint = 0x013FB279;
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, false, dwProcessID);
BOOL bDebugging = DebugActiveProcess(dwProcessID);
printf("bDebugging = %d\n", bDebugging);
DWORD dwThreadID = GetProcessThreadID(dwProcessID);
HANDLE hThread = OpenThread(THREAD_ALL_ACCESS, FALSE, dwThreadID);
CONTEXT parentCtx;
parentCtx.ContextFlags = CONTEXT_DEBUG_REGISTERS;
if (GetThreadContext(hThread, &parentCtx))
{
parentCtx.Dr0 = (DWORD)hpChangeBreakpoint;
parentCtx.Dr7 = 0x00000001;
std::cout << "GetThreadContext successful" << std::endl;
SetThreadContext(hThread, &parentCtx);
}
DEBUG_EVENT DebugEvent;
DWORD dbgFlag = DBG_CONTINUE;
DWORD *currentHpPointerAddress = nullptr;
DWORD *maxHpPointerAddress = nullptr;
BOOLEAN bQuit = FALSE;
while (!bQuit && WaitForDebugEvent(&DebugEvent, INFINITE))
{
dbgFlag = DBG_CONTINUE;
switch (DebugEvent.dwDebugEventCode)
{
case EXCEPTION_DEBUG_EVENT:
switch (DebugEvent.u.Exception.ExceptionRecord.ExceptionCode)
{
case EXCEPTION_SINGLE_STEP:
if (DebugEvent.u.Exception.ExceptionRecord.ExceptionAddress == (void*)hpChangeBreakpoint)
{
#define RESUME_FLAG 0x10000
CONTEXT childContext;
childContext.ContextFlags = CONTEXT_FULL;
if (GetThreadContext(hThread, &childContext))
{
childContext.EFlags |= RESUME_FLAG;
SetThreadContext(hThread, &childContext);
std::cout << "current HP: " << childContext.Ecx << std::endl;
currentHpPointerAddress = (DWORD*)((char *)childContext.Edi + 0x8E0);
maxHpPointerAddress = (DWORD*)((char *)childContext.Edi + 0x8E4);
}
if (GetThreadContext(hThread, &parentCtx))
{
parentCtx.Dr0 = 0;
parentCtx.Dr7 = 0x400;
SetThreadContext(hThread, &parentCtx);
bQuit = TRUE;
}
}
else
dbgFlag = DBG_EXCEPTION_NOT_HANDLED;
break;
default:
dbgFlag = DBG_EXCEPTION_NOT_HANDLED;
}
break;
case LOAD_DLL_DEBUG_EVENT:
{
CloseHandle(DebugEvent.u.LoadDll.hFile);
break;
}
case CREATE_PROCESS_DEBUG_EVENT:
{
CloseHandle(DebugEvent.u.CreateProcessInfo.hFile);
break;
}
case EXIT_PROCESS_DEBUG_EVENT:
break;
default:
__nop();
}
if (!ContinueDebugEvent(DebugEvent.dwProcessId, DebugEvent.dwThreadId, dbgFlag))
{
break;
}
if (bQuit)
DebugActiveProcessStop(dwProcessID);
}
while (1)
{
WORD currentHP = 0;
WORD maxHP = 0;
if (
ReadProcessMemory(hProcess, currentHpPointerAddress, ¤tHP, sizeof(currentHP), NULL) == 0
|| ReadProcessMemory(hProcess, maxHpPointerAddress, &maxHP, sizeof(maxHP), NULL) == 0
)
{
printf("Failed to read memory: %u\n", GetLastError());
}
else {
std::cout << "HP: " << currentHP << " / " << maxHP << std::endl;
}
Sleep(1000);
}
system("pause>nul");
return 0;
}
当我运行它时，游戏运行良好，直到断点发生，当它发生时，我得到无限的“断点”cout 的垃圾邮件，当我调试它时，这一行： if (DebugEvent.u.Exception.ExceptionRecord.ExceptionAddress == (void*)hpChangeBreakpoint)
总是正确的，但是 dwFirstChance 标志是 1，所以它总是一个新的异常？在这个无限循环中唯一改变的是 hThread，总是不同的。由于我缺乏知识，我觉得我错过了一些东西，因此将不胜感激任何帮助或正确方向的提示。谢谢！
【问题讨论】：
标签： c++ windows debugging reverse-engineering