从另一个进程调用SetDllDirectory不起作用？

Question

我一直试图从一个“注入器”程序中切换我不拥有的程序的Dll目录，这个程序应该切换Dll加载目录来加载修改或点击的Dll。

以下是功能：

void AddDirectory(HANDLE Handle, const char* DllPath)
{
    void *Function, *String;
    Function = (void*)(SetDllDirectoryA);
    String = (void*)VirtualAllocEx(Handle, NULL, strlen(DllPath), MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
    CreateRemoteThread(Handle, NULL, NULL, (LPTHREAD_START_ROUTINE)Function, (void*)String, NULL, NULL);
}

我看不出为什么这不管用？

Answer 1

感谢本·沃尔格特提供的上述帮助！

编辑:注意，正如before所说，您必须确保您能够及时拦截进程，以便在加载DLL之前更改目录。因此，这并不总是起作用的，尽管在我的例子中是这样的。

如果有人想拦截进程加载位置，可以在以下位置找到代码：

    void AddDirectory(HANDLE Handle, const char* DllPath)
{
    if (!Handle)
    {
        //Error Message or Redirect
    }

    LPVOID AddDllDirAddr = (LPVOID)GetProcAddress(GetModuleHandleA("kernel32.dll"), "SetDllDirectoryA");
    if (!AddDllDirAddr)
    {
        //Error Message or Redirect
    }

    LPVOID Alloc = VirtualAllocEx(Handle, NULL, strlen(DllPath), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    if (!Alloc)
    {
        //Error Message or Redirect
    }

    WriteProcessMemory(Handle, Alloc, DllPath, strlen(DllPath), NULL);
    HANDLE Thread = CreateRemoteThread(Handle, NULL, NULL, (LPTHREAD_START_ROUTINE)AddDllDirAddr, Alloc, 0, NULL);
    if (!Thread)
    {
        //Error Message or Redirect
    }

    WaitForSingleObject(Thread, INFINITE);
    VirtualFreeEx(Handle, Alloc, strlen(DllPath), MEM_RELEASE);
    CloseHandle(Thread);
    CloseHandle(Handle);
}