error LNK2001: unresolved external symbol KeServiceDescriptorTable

unit driver;

interface

uses DDDK;

function _DriverEntry(DriverObject: PDriverObject; RegistryPath:
  PUnicodeString): NTSTATUS; stdcall;

var
  POldDebugActiveProcess: PLong;  //保存NTDebugActiveProcess函数在SSDT表中的指针。
  OldDebugActiveProcessAdd : PLong; //保存原来的NTDebugActiveProcess函数的地址。
implementation

function MyDebugActiveProcess(PID:ULong):Boolean;stdcall; //Hook函数
begin
        Result := False; 
end;

procedure DriverUnload(DriverObject: PDriverObject); stdcall;
begin
  asm   //关中断
                cli
                mov eax,cr0
                and eax,not $10000
                mov cr0,eax
  end;

  POldDebugActiveProcess^ := ULong(OldDebugActiveProcessAdd); //恢复SSDT

  asm   //开中断
    mov  eax,cr0
    or   eax,$10000
    mov  cr0,eax
    sti
  end;
  //DbgPrint('DriverUnload(DriverObject:0x%.8X)',[DriverObject]);
  //DbgPrint('DriverUnload(-)',[]);
end;

function _DriverEntry(DriverObject: PDriverObject; RegistryPath:
  PUnicodeString): NTSTATUS; stdcall;
begin

  DriverObject^.DriverUnload := @DriverUnload;
  POldDebugActiveProcess := Pointer(ULONG(KeServiceDescriptorTable.ServiceTableBase) + $39
    * 4); //$39为NTDebugActiveProcess在XP SP2中的服务号，可由IceSword查出。
  OldDebugActiveProcessAdd := Pointer(POldDebugActiveProcess^);//保存原来的NTDebugActiveProcess函数地址，以备驱动卸载时候恢复。

  asm  //关中断
                cli
                mov eax,cr0
                and eax,not $10000
                mov cr0,eax
  end;
  POldDebugActiveProcess^ := ULong(@MyDebugActiveProcess);//修改SSDT表，将服务号为$39的函数改为自己的钩子函数地址，以实现HOOK。

  asm   //开中断
    mov  eax,cr0
    or   eax,$10000
    mov  cr0,eax
    sti
  end;
  Result := STATUS_SUCCESS;


end;

end.

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