python - Ctypes-无法使用 NtQueryInformationProcess 获取 PEB 地址

Question

我正在使用 ctypes 并尝试使用 NtQueryInformationProcess 函数获取 PEB 地址。

返回值为0，表示函数成功完成。 但 PROCESS_BASIC_INFORMATION 结构(作为第三个参数给出)不包含 PEB 地址。

class PROCESS_BASIC_INFORMATION(Structure):
    _fields_ = [
        ("Reserved1", c_void_p),
        ("PebBaseAddress", DWORD),
        ("Reserved2", c_void_p * 2),
        ("UniqueProcessId", DWORD),
        ("Reserved3", c_void_p)]

ntdll = WinDLL('ntdll')
NTSTATUS = LONG
ntdll.argtypes = [HANDLE, DWORD, c_void_p, DWORD, PDWORD]
ntdll.restype = NTSTATUS
processInformation = PROCESS_BASIC_INFORMATION()
processInformationLength = sizeof(PROCESS_BASIC_INFORMATION)
result = ntdll.NtQueryInformationProcess(hProcess, 0, processInformation, processInformationLength, byref(DWORD(0)))

考虑一下返回值为 0 的事实，可能是什么问题？

Answer 1

列表[Python 3.Docs]: ctypes - A foreign function library for Python .

1. 您为错误对象 (ntdll) 定义了argtypes 和restype。您应该为 ntdll.NtQueryInformationProcess 定义它们。当我们在这里时，很明显您喜欢DWORD。即使在这种情况下没有什么区别，请保持函数签名与来自 C 的函数签名一致:

   ntdll.NtQueryInformationProcess.argtypes = [HANDLE, c_int, c_void_p, ULONG, PULONG]
   ntdll.NtQueryInformationProcess.restype = NTSTATUS
   

   未能在函数上定义argtypes和restype(或做得不正确)，可能(并且很可能会)导致:

   • [SO]: Python ctypes cdll.LoadLibrary, instantiate an object, execute its method, private variable address truncated (@CristiFati's answer)
   • [SO]: python ctypes issue on different OSes (@CristiFati's answer)

2. 根据[MS.Docs]: NtQueryInformationProcess function (强调是我的):

   ProcessInformation

   A pointer to a buffer supplied by the calling application into which the function writes the requested information.

   因此，您的调用应该类似于(通过引用传递processInformation):

   result = ntdll.NtQueryInformationProcess(hProcess, 0, byref(processInformation), processInformationLength, byref(DWORD(0)))
   

3. 根据同一页面，您的结构定义不正确。应该是:

   class PROCESS_BASIC_INFORMATION(Structure):
       _fields_ = [
           ("Reserved1", c_void_p),
           ("PebBaseAddress", c_void_p),
           ("Reserved2", c_void_p * 2),
           ("UniqueProcessId", c_void_p),
           ("Reserved3", c_void_p),
       ]
   

   您的版本(在64位上)短了8个字节(因为DWORD和指针之间的(2)大小差异)，导致传递的缓冲区太短函数，这是U未定义的B行为(它可能导致崩溃)。