how to get PDEVICE_OBJECT name

[Anonymous]

I need to enumerate names of devices objects belongs to not my DriverObject.
I get DriverObject that i need by ObReferenceObjectByName, next i successfully enumerating Device Objects, but all the names are “(null)”. I see by DeviceTree.exe that all the Device Objects are not unnamed.

Help me please, i need to do it as fast as i can , but i haven’t any idea what to do

All the names getting from this code are =”(null)”;

RtlInitUnicodeString( &nameUsbStor, L"\Driver\USBSTOR" );

status = ObReferenceObjectByName(&nameUsbStor,OBJ_CASE_INSENSITIVE,NULL,(ACCESS_MASK)0L,*IoDriverObjectType,KernelMode,NULL,&DriverObject);

if (NT_SUCCESS( status ))

{

// request to know number of devices in USBSTOR

status = (gFuncTbl.EnumerateDeviceObjectList)(DriverObject,NULL,0,&numDevices);



DbgPrint("USBSTOR has devices num = %d rn",numDevices);



if(status != STATUS_BUFFER_TOO_SMALL) goto func_exit_deref;



numDevices += 8;//for some bad case



devList = SDalloc(numDevices * sizeof(PDEVICE_OBJECT));



if (NULL == devList)                  goto func_exit_deref;



status = (gFuncTbl.EnumerateDeviceObjectList)(DriverObject,devList,(numDevices * sizeof(PDEVICE_OBJECT)),&numDevices);

if (!NT_SUCCESS( status ))

{

SDfree(devList);

goto func_exit_deref;

}

//  Walk the given list of devices into USBSTOR

for (i=0; i < numDevices; i++)

{

try

{

SDGetObjectName( devList, &name );

DbgPrint("device object of USBSTOR name = %wZ rn", &name);



baseDeviceObject = (gFuncTbl.GetDeviceAttachmentBaseRef)( devList );

SDGetObjectName( baseDeviceObject, &name )

ObDereferenceObject( baseDeviceObject );



DbgPrint("baseDeviceObject name = %wZ rn",&name);



currentDevObj = (gFuncTbl.GetAttachedDeviceReference)( devList );

do

{

SDGetObjectName( currentDevObj, &name );

DbgPrint("device object of USBSTOR name = %wZ rn", &name);

nextDevObj = (gFuncTbl.GetLowerDeviceObject)( currentDevObj );

ObDereferenceObject( currentDevObj );

currentDevObj = nextDevObj;



} while (NULL != currentDevObj);



}

finally

{

ObDereferenceObject( devList );

}

}

ObDereferenceObject( DriverObject );

}

[/code]

[Anonymous]

I found error, thanks to all who wans to help me.
My code above is absolutely workable, i’m in a hurry now and i did foolish error (commenting some line of code bofere this code snippet).
Thanks once more

[Author]

Posts