ExCreateCallback returns unnamed callback

NTDEV
1

I’m creating a callback with ExCreateCallback from the DriverEntry. The function succeeds and creates a callback for which ExRegisterCallback also succeeds, but the callback is an unnamed object, is not present in \Callback directory and subsequent open with ExCreateCallback(…,…,FALSE,…) with a same name returns STATUS_OBJECT_NAME_NOT_FOUND

Using approximatelly this code:

#define wszCallbackName L"\Callback\MyCallbackName"

{
UNICODE_STRING CallbackName;
OBJECT_ATTRIBUTES ObjAttr;

RtlInitUnicodeString(&CallbackName,wszCallbackName);
InitializeObjectAttributes(&ObjAttr,&CallbackName,OBJ_CASE_INSENSITIVE,NULL,NULL);
Status=ExCreateCallback(&CallbackObj,&ObjAttr,TRUE,TRUE);
}

How should then a named callback be created?

2

You also have to specify OBJ_PERMANENT:
InitializeObjectAttributes(&ObjAttr,
&CallbackName,
OBJ_PERMANENT | OBJ_CASE_INSENSITIVE,
NULL,
NULL);