43  * DOC: master and authentication
47  * least once successfully became the device master (either through the
49  * no one else is the current master that time) there exists one &drm_master.
53  * In addition only one &drm_master can be the current master for a &drm_device.
58  * Clients can authenticate against the current master (if it matches their own)
69 	return fpriv->is_master && drm_lease_owner(fpriv->master) == fpriv->minor->dev->master;  in drm_is_current_master_locked()
73  * drm_is_current_master - checks whether @priv is the current master
76  * Checks whether @fpriv is current master on its device. This decides whether a
80  * - the current master is assumed to own the non-shareable display hardware.
101 		ret = idr_alloc(&file_priv->master->magic_map, file_priv,  in drm_getmagic()
122 	file = idr_find(&file_priv->master->magic_map, auth->magic);  in drm_authmagic()
125 		idr_replace(&file_priv->master->magic_map, NULL, auth->magic);  in drm_authmagic()
133 	struct drm_master *master;  in drm_master_create()  local
135 	master = kzalloc_obj(*master);  in drm_master_create()
136 	if (!master)  in drm_master_create()
139 	kref_init(&master->refcount);  in drm_master_create()
140 	idr_init_base(&master->magic_map, 1);  in drm_master_create()
141 	master->dev = dev;  in drm_master_create()
144 	INIT_LIST_HEAD(&master->lessees);  in drm_master_create()
145 	INIT_LIST_HEAD(&master->lessee_list);  in drm_master_create()
146 	idr_init(&master->leases);  in drm_master_create()
147 	idr_init_base(&master->lessee_idr, 1);  in drm_master_create()
149 	return master;  in drm_master_create()
155 	dev->master = drm_master_get(fpriv->master);  in drm_set_master()
170 	old_master = fpriv->master;  in drm_new_set_master()
175 	fpriv->master = new_master;  in drm_new_set_master()
192  * from becoming master and/or failing to release it.
194  * At the same time, the first client (for a given VT) is _always_ master.
198  * If the CAP_SYS_ADMIN was missing, no other client could become master...
204  * master as applicable. It does so by opening the fd and passing it to users
205  * while in itself logind a) does the set/drop master per users' request and
206  * b)  * implicitly drops master on VT switch.
210  * root is required _solely_ for SET/DROP MASTER.
212  *  - any client which fails to drop master* can DoS the application using
220  *  - allow a client to drop/set master, iff it is/was master at a given point
225  *  - open the node, become master implicitly and cause issues
259 	if (dev->master)  in drm_setmaster_ioctl()
262 	if (!file_priv->master)  in drm_setmaster_ioctl()
268 	if (file_priv->master->lessor != NULL) {  in drm_setmaster_ioctl()
270 			      "Attempt to set lessee %d as master\n",  in drm_setmaster_ioctl()
271 			      file_priv->master->lessee_id);  in drm_setmaster_ioctl()
285 	drm_master_put(&dev->master);  in drm_drop_master()
302 	if (!dev->master)  in drm_dropmaster_ioctl()
305 	if (file_priv->master->lessor != NULL) {  in drm_dropmaster_ioctl()
307 			      "Attempt to drop lessee %d as master\n",  in drm_dropmaster_ioctl()
308 			      file_priv->master->lessee_id);  in drm_dropmaster_ioctl()
322 	/* if there is no current master make this fd it, but do not create  in drm_master_open()
323 	 * any master object for render clients  in drm_master_open()
326 	if (!dev->master) {  in drm_master_open()
330 		file_priv->master = drm_master_get(dev->master);  in drm_master_open()
340 	struct drm_master *master;  in drm_master_release()  local
343 	master = file_priv->master;  in drm_master_release()
345 		idr_remove(&file_priv->master->magic_map, file_priv->magic);  in drm_master_release()
350 	if (dev->master == file_priv->master)  in drm_master_release()
355 		 * this is the "real" master  in drm_master_release()
357 		drm_lease_revoke(master);  in drm_master_release()
360 	/* drop the master reference held by the file priv */  in drm_master_release()
361 	if (file_priv->master)  in drm_master_release()
362 		drm_master_put(&file_priv->master);  in drm_master_release()
366  * drm_master_get - reference a master pointer
367  * @master: &struct drm_master
369  * Increments the reference count of @master and returns a pointer to @master.
371 struct drm_master *drm_master_get(struct drm_master *master)  in drm_master_get()  argument
373 	kref_get(&master->refcount);  in drm_master_get()
374 	return master;  in drm_master_get()
379  * drm_file_get_master - reference &drm_file.master of @file_priv
382  * Increments the reference count of @file_priv's &drm_file.master and returns
383  * the &drm_file.master. If @file_priv has no &drm_file.master, returns NULL.
385  * Master pointers returned from this function should be unreferenced using
390 	struct drm_master *master = NULL;  in drm_file_get_master()  local
393 	if (!file_priv->master)  in drm_file_get_master()
395 	master = drm_master_get(file_priv->master);  in drm_file_get_master()
399 	return master;  in drm_file_get_master()
405 	struct drm_master *master = container_of(kref, struct drm_master, refcount);  in drm_master_destroy()  local
406 	struct drm_device *dev = master->dev;  in drm_master_destroy()
409 		drm_lease_destroy(master);  in drm_master_destroy()
411 	idr_destroy(&master->magic_map);  in drm_master_destroy()
412 	idr_destroy(&master->leases);  in drm_master_destroy()
413 	idr_destroy(&master->lessee_idr);  in drm_master_destroy()
415 	kfree(master->unique);  in drm_master_destroy()
416 	kfree(master);  in drm_master_destroy()
420  * drm_master_put - unreference and clear a master pointer
421  * @master: pointer to a pointer of &struct drm_master
423  * This decrements the &drm_master behind @master and sets it to NULL.
425 void drm_master_put(struct drm_master **master)  in drm_master_put()  argument
427 	kref_put(&(*master)->refcount, drm_master_destroy);  in drm_master_put()
428 	*master = NULL;  in drm_master_put()
436 	if (dev->master) {  in drm_master_internal_acquire()