关于PsCreateSystemThread函数

研究了1天这个。。。MSDN说的不是很清楚
NTSTATUS PsCreateSystemThread(
  _Out_      PHANDLE ThreadHandle,
  _In_       ULONG DesiredAccess,
  _In_opt_   POBJECT_ATTRIBUTES ObjectAttributes,
  _In_opt_   HANDLE ProcessHandle,
  _Out_opt_  PCLIENT_ID ClientId,
  _In_       PKSTART_ROUTINE StartRoutine,
  _In_opt_   PVOID StartContext
);

该函数用于创建系统线程，ProcessHandle参数接收NULL,     NtCurrentProcess() (-1)   ,或指定进程句柄 三种情况  都可以用PsTerminateSystemThread结束掉
示例：

[C++] 纯文本查看 复制代码

01	VOID MyThread(PVOID StartContext)

02

{

03	PEPROCESS pp=IoGetCurrentProcess();

04	NTSTATUS status=PsTerminateSystemThread(0);

05	//以下实际上已经不执行了

06	if(status == STATUS_INVALID_PARAMETER)

07

{

08	KdPrint(("not systemthread"));

09

}

10

}

11

12	HANDLE OpenProcess(HANDLE  Processid)

13

{

14	NTSTATUS status;

15	PEPROCESS Process = NULL;

16	HANDLE hProcess = NULL;

17	UNICODE_STRING Unicode;

18	status = PsLookupProcessByProcessId(Processid, &Process);

19	if (NT_SUCCESS(status))//判断进程号是否存在

20

{

21	RtlInitUnicodeString(&Unicode, L"PsProcessType");

22	//得到系统导出函数的地址和用户态的GetProcessAddress雷同

23	PsProcessType = (POBJECT_TYPE*)MmGetSystemRoutineAddress(&Unicode);

24	if (PsProcessType)

25

{

26	status = ObOpenObjectByPointer(Process,0,NULL,PROCESS_ALL_ACCESS,(POBJECT_TYPE) * PsProcessType,

27	KernelMode,&hProcess);

28	if (NT_SUCCESS(status))

29

{

30

//减少指针计数

31	ObfDereferenceObject(Process);

32	return hProcess;

33

}

34

}

35	ObfDereferenceObject(Process);

36

}

37

return 0;

38

}

39

40	HANDLE outthread1,,outthread2,outthread3,outthread4,hproc;

41

42	PsCreateSystemThread(&outthread1,THREAD_ALL_ACCESS,NULL,NULL,NULL,MyThread,NULL);

43	PsCreateSystemThread(&outthread2,THREAD_ALL_ACCESS,NULL,NtCurrentProcess(),NULL,MyThread,NULL);

44

45	OBJECT_ATTRIBUTES oa;

46	CLIENT_ID ci={(HANDLE)1472,0};//注意是进程ID！

47	RtlZeroMemory(&oa,sizeof(oa));

48	oa.Length=sizeof(oa);

49	ZwOpenProcess(&hproc,PROCESS_ALL_ACCESS,&oa,&ci);

50	PsCreateSystemThread(&outthread3,THREAD_ALL_ACCESS,NULL,hproc,NULL,MyThread,NULL);

51

52	hproc=OpenProcess((HANDLE)1472);//注意是进程ID！

53	PsCreateSystemThread(&outthread4,THREAD_ALL_ACCESS,NULL,hproc,NULL,MyThread,NULL);

该函数创建的线程，其PETHRAD属性的CrossThreadFlags有PS_CROSS_THREAD_FLAGS_SYSTEM属性，不允许以挂起模式创建线程，，其他和普通的NtCreateThread差别不大！
然而在微软官方源码中，PS_CROSS_THREAD_FLAGS_SYSTEM属性即为SystemThread，尽管其所属进程可能是explorer.exe  

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