1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* user_defined.c: user defined key type
13 #include <keys/user-type.h>
20  * user defined keys take an arbitrary string as the description and an
24 	.name			= "user",
57  * Preparse a user defined key payload
62 	size_t datalen = prep->datalen;  in user_preparse()
64 	if (datalen <= 0 || datalen > 32767 || !prep->data)  in user_preparse()
65 		return -EINVAL;  in user_preparse()
69 		return -ENOMEM;  in user_preparse()
72 	prep->quotalen = datalen;  in user_preparse()
73 	prep->payload.data[0] = upayload;  in user_preparse()
74 	upayload->datalen = datalen;  in user_preparse()
75 	memcpy(upayload->data, prep->data, datalen);  in user_preparse()
81  * Free a preparse of a user defined key payload
85 	kfree_sensitive(prep->payload.data[0]);  in user_free_preparse()
98  * update a user defined key
99  * - the key's semaphore is write-locked
107 	ret = key_payload_reserve(key, prep->datalen);  in user_update()
112 	key->expiry = prep->expiry;  in user_update()
115 	rcu_assign_keypointer(key, prep->payload.data[0]);  in user_update()
116 	prep->payload.data[0] = NULL;  in user_update()
119 		call_rcu(&zap->rcu, user_free_payload_rcu);  in user_update()
126  * - called with the key sem write-locked
137 		call_rcu(&upayload->rcu, user_free_payload_rcu);  in user_revoke()
144  * dispose of the data dangling from the corpse of a user key
148 	struct user_key_payload *upayload = key->payload.data[0];  in user_destroy()
156  * describe the user key
160 	seq_puts(m, key->description);  in user_describe()
162 		seq_printf(m, ": %u", key->datalen);  in user_describe()
169  * - the key's semaphore is read-locked
177 	ret = upayload->datalen;  in user_read()
181 		if (buflen > upayload->datalen)  in user_read()
182 			buflen = upayload->datalen;  in user_read()
184 		memcpy(buffer, upayload->data, buflen);  in user_read()
200 		return -EINVAL;  in logon_vet_description()
204 		return -EINVAL;  in logon_vet_description()