1 // SPDX-License-Identifier: GPL-2.0-or-later
4  * Copyright (C) 2009-2011 Red Hat, Inc. All Rights Reserved.
10 #include <keys/keyring-type.h>
40  * Any key whose type gets unregistered will be re-typed to this if it can't be
49  * - time precision isn't particularly important
56 	kenter("%lld", gc_at - now);  in key_schedule_gc()
64 		expires = jiffies + (gc_at - now) * HZ;  in key_schedule_gc()
74 	key->expiry = expiry;  in key_set_expiry()
76 		if (!(key->type->flags & KEY_TYPE_INSTANT_REAP))  in key_set_expiry()
114 	kenter("%s", ktype->name);  in key_gc_keytype()
139 			list_entry(keys->next, struct key, graveyard_link);  in key_gc_unused_keys()
140 		short state = key->state;  in key_gc_unused_keys()
142 		list_del(&key->graveyard_link);  in key_gc_unused_keys()
144 		kdebug("- %u", key->serial);  in key_gc_unused_keys()
148 		remove_watch_list(key->watchers, key->serial);  in key_gc_unused_keys()
149 		key->watchers = NULL;  in key_gc_unused_keys()
153 		if (state == KEY_IS_POSITIVE && key->type->destroy)  in key_gc_unused_keys()
154 			key->type->destroy(key);  in key_gc_unused_keys()
158 		atomic_dec(&key->user->nkeys);  in key_gc_unused_keys()
160 			atomic_dec(&key->user->nikeys);  in key_gc_unused_keys()
162 		key_user_put(key->user);  in key_gc_unused_keys()
163 		key_put_tag(key->domain_tag);  in key_gc_unused_keys()
164 		kfree(key->description);  in key_gc_unused_keys()
182 #define KEY_GC_REAP_AGAIN	0x01	/* - Need another cycle */  in key_garbage_collector()
183 #define KEY_GC_REAPING_LINKS	0x02	/* - We need to reap links */  in key_garbage_collector()
184 #define KEY_GC_REAPING_DEAD_1	0x10	/* - We need to mark dead keys */  in key_garbage_collector()
185 #define KEY_GC_REAPING_DEAD_2	0x20	/* - We need to reap dead key links */  in key_garbage_collector()
186 #define KEY_GC_REAPING_DEAD_3	0x40	/* - We need to reap dead keys */  in key_garbage_collector()
187 #define KEY_GC_FOUND_DEAD_KEY	0x80	/* - We found at least one dead key */  in key_garbage_collector()
210 	 * serial tree, if cursor is non-NULL then it will always point to a  in key_garbage_collector()
211 	 * valid node in the tree - even if lock got dropped.  in key_garbage_collector()
221 		if (!test_bit_acquire(KEY_FLAG_USER_ALIVE, &key->flags)) {  in key_garbage_collector()
222 			/* Clobber key->user after final put seen. */  in key_garbage_collector()
227 			if (key->type == key_gc_dead_keytype) {  in key_garbage_collector()
229 				set_bit(KEY_FLAG_DEAD, &key->flags);  in key_garbage_collector()
230 				key->perm = 0;  in key_garbage_collector()
232 			} else if (key->type == &key_type_keyring &&  in key_garbage_collector()
233 				   key->restrict_link) {  in key_garbage_collector()
238 		expiry = key->expiry;  in key_garbage_collector()
240 			if (!(key->type->flags & KEY_TYPE_INSTANT_REAP))  in key_garbage_collector()
244 				       key_serial(key), key->expiry - limit);  in key_garbage_collector()
245 				new_timer = key->expiry;  in key_garbage_collector()
250 			if (key->type == key_gc_dead_keytype)  in key_garbage_collector()
255 			if (key->type == &key_type_keyring)  in key_garbage_collector()
260 			if (key->type == key_gc_dead_keytype)  in key_garbage_collector()
308 			/* No remaining dead keys: short circuit the remaining  in key_garbage_collector()
311 			kdebug("dead short");  in key_garbage_collector()
331 	/* We found an unreferenced key - once we've removed it from the tree,  in key_garbage_collector()
335 	kdebug("unrefd key %d", key->serial);  in key_garbage_collector()
336 	rb_erase(&key->serial_node, &key_serial_tree);  in key_garbage_collector()
339 	list_add_tail(&key->graveyard_link, &graveyard);  in key_garbage_collector()
366 	kdebug("destroy key %d", key->serial);  in key_garbage_collector()
367 	down_write(&key->sem);  in key_garbage_collector()
368 	key->type = &key_type_dead;  in key_garbage_collector()
369 	if (key_gc_dead_keytype->destroy)  in key_garbage_collector()
370 		key_gc_dead_keytype->destroy(key);  in key_garbage_collector()
371 	memset(&key->payload, KEY_DESTROY, sizeof(key->payload));  in key_garbage_collector()
372 	up_write(&key->sem);  in key_garbage_collector()