一、由於ObReferenceObjectByName沒有文檔化,故在使用前先做聲明:
#ifdef __cplusplus
extern "C"
{
#endif
#include <NTDDK.h>
NTKERNELAPI
NTSTATUS
ObReferenceObjectByName(
IN PUNICODE_STRING ObjectName,
IN ULONG Attributes,
IN PACCESS_STATE PassedAccessState OPTIONAL,
IN ACCESS_MASK DesiredAccess OPTIONAL,
IN POBJECT_TYPE ObjectType,
IN KPROCESSOR_MODE AccessMode,
IN OUT PVOID ParseContext OPTIONAL,
OUT PVOID *Object
);
extern POBJECT_TYPE IoDeviceObjectType;
#ifdef __cplusplus
}
#endif
二、使用
調試ObReferenceObjectByName發現,
(1)可以根據驅動名稱可以得到PDRIVER_OBJECT,進而得到該驅動的PDEVICE_OBJECT。
(2)根據設備名稱取到PDEVICE_OJBECT爲0。
(3)根據符號鏈接名稱取到PDEVICE_OJBECT的地址並不是設備對象地址。
調試代碼如下:
UNICODE_STRING DeviceName;
// RtlInitUnicodeString( &DeviceName, L"\\??\\HelloDDKA" );
// RtlInitUnicodeString( &DeviceName, L"\\??\\DriverA" );
RtlInitUnicodeString( &DeviceName, L"\\Driver\\DriverA" );
PDEVICE_OBJECT DeviceObject = NULL;
PFILE_OBJECT FileObject = NULL;
PDRIVER_OBJECT pDriver = NULL;
// ntStatus = ObReferenceObjectByName(&DeviceName,OBJ_CASE_INSENSITIVE,NULL,FILE_ALL_ACCESS,IoDeviceObjectType,KernelMode,NULL,(PVOID*)&DeviceObject);
ntStatus = ObReferenceObjectByName(&DeviceName,OBJ_CASE_INSENSITIVE,NULL,FILE_ALL_ACCESS,IoDeviceObjectType,KernelMode,NULL,(PVOID*)&pDriver);
DeviceObject = pDriver->DeviceObject;
PDEVICE_EXTENSION pdx = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;
三、關閉引用
調用上面的ObReferenceObjectByName對象指針,當得到的對象不再使用後,記得調用ObDereferenceObject關閉引用。
(1)如果得到的是驅動對象,則關閉驅動對象引用,如ObDereferenceObject(pDriver)
(2)如果得到是設備對象,則關閉設備對象引用,如ObDereferenceObject(deviceObject)
(3)如果得到的是文件對象,則關閉文件對象引用,如ObDereferenceObject(fileObject)