[英]How to fix “LPVOID: unknown size” error while using the CreateRemoteThread API?
我正在嘗試創建一個用於執行DLL-Injection
的工具,方法是使用VirtualAclloc()
API將DLL寫入正在運行的進程的內存中,然后找到入口點的偏移量,並通過添加入口點將其傳遞給CreateRemoteThread()
API。偏移到VirtualAlloc
函數的基址。
由於在調用CreateRemoteThread()
時不需要傳遞給lpStartAddress
任何參數,因此將lpParameter
初始化為NULL。
LPVOID lpParameter = NULL;
...
...
thread_handle = CreateRemoteThread(process_handle, NULL, 0, (LPTHREAD_START_ROUTINE)(base_address + offset), lpParameter, 0, NULL);
編譯代碼時出現錯誤:
LPVOID:未知大小”和消息“表達式必須是指向完整對象類型的指針”。
有沒有一種方法可以將lpParameter
的值傳遞為NULL?
base_address + offset
將offset*sizeof *base_address
字節添加到指針base_address
。 但是,如果base_address
的類型為LPVOID
則*base_address
沒有大小,因此這是錯誤的。 看看C ++書中有關指針算法的部分。
從上下文中,我想您應該將base_address
更改為char*
而不是LPVOID
。 或者您可以添加這樣的轉換(LPTHREAD_START_ROUTINE)((char*)base_address + offset)
。
在這種情況下,您需要遵循以下過程:
下面是示例代碼:
char* dllPath = "C:\\testdll.dll";
int procID = 16092;
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, procID);
if (!hProcess) {
printf("Error: Process not found.\n");
}
LPVOID lpvLoadLib = (LPVOID)GetProcAddress(GetModuleHandle(L"kernel32.dll"), "LoadLibraryA"); /*address of LoadLibraryA*/
if (!lpvLoadLib) {
printf("Error: LoadLibraryA not found.\n");
}
LPVOID lpBaseAddress = (LPVOID)VirtualAllocEx(hProcess, NULL, strlen(dllPath)+1, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE); /*Initialize and Allocate memory to zero in target process address space*/
if (!lpBaseAddress) {
printf("Error: Memory was not allocated.\n");
}
SIZE_T byteswritten;
int result = WriteProcessMemory(hProcess, lpBaseAddress, (LPCVOID)dllPath, strlen(dllPath)+1, &byteswritten); /*Write the path of dll to an area of memory in a specified process*/
if (result == 0) {
printf("Error: Could not write to process address space.\n");
}
HANDLE threadID = CreateRemoteThread(hProcess, NULL, 0, (LPTHREAD_START_ROUTINE)lpvLoadLib, lpBaseAddress, NULL, NULL); /*lpStartAddress = lpvLoadLib address of LoadLibraryA function*/
if (!threadID) {
printf("Error: Not able to create remote thread.\n");
}
else {
printf("Remote process created...!");
}
希望這可以幫助
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