algboss.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Create default crypto algorithm instances.
  4 *
  5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  6 */
  7
  8#include <crypto/internal/aead.h>
  9#include <linux/completion.h>
 10#include <linux/ctype.h>
 11#include <linux/err.h>
 12#include <linux/init.h>
 13#include <linux/kthread.h>
 14#include <linux/module.h>
 15#include <linux/notifier.h>
 16#include <linux/rtnetlink.h>
 17#include <linux/sched/signal.h>
 18#include <linux/slab.h>
 19#include <linux/string.h>
 20
 21#include "internal.h"
 22
 23struct cryptomgr_param {
 24	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
 25
 26	struct {
 27		struct rtattr attr;
 28		struct crypto_attr_type data;
 29	} type;
 30
 31	struct {
 32		struct rtattr attr;
 33		struct crypto_attr_alg data;
 34	} attrs[CRYPTO_MAX_ATTRS];
 35
 36	char template[CRYPTO_MAX_ALG_NAME];
 37
 38	struct crypto_larval *larval;
 39
 40	u32 otype;
 41	u32 omask;
 42};
 43
 44struct crypto_test_param {
 45	char driver[CRYPTO_MAX_ALG_NAME];
 46	char alg[CRYPTO_MAX_ALG_NAME];
 47	u32 type;
 48};
 49
 50static int cryptomgr_probe(void *data)
 51{
 52	struct cryptomgr_param *param = data;
 53	struct crypto_template *tmpl;
 54	int err = -ENOENT;
 55
 56	tmpl = crypto_lookup_template(param->template);
 57	if (!tmpl)
 58		goto out;
 59
 60	do {
 61		err = tmpl->create(tmpl, param->tb);
 62	} while (err == -EAGAIN && !signal_pending(current));
 63
 64	crypto_tmpl_put(tmpl);
 65
 66out:
 67	param->larval->adult = ERR_PTR(err);
 68	param->larval->alg.cra_flags |= CRYPTO_ALG_DEAD;
 69	complete_all(&param->larval->completion);
 70	crypto_alg_put(&param->larval->alg);
 71	kfree(param);
 72	module_put_and_kthread_exit(0);
 73}
 74
 75static int cryptomgr_schedule_probe(struct crypto_larval *larval)
 76{
 77	struct task_struct *thread;
 78	struct cryptomgr_param *param;
 79	const char *name = larval->alg.cra_name;
 80	const char *p;
 81	unsigned int len;
 82	int i;
 83
 84	if (!try_module_get(THIS_MODULE))
 85		goto err;
 86
 87	param = kzalloc(sizeof(*param), GFP_KERNEL);
 88	if (!param)
 89		goto err_put_module;
 90
 91	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
 92		;
 93
 94	len = p - name;
 95	if (!len || *p != '(')
 96		goto err_free_param;
 97
 98	memcpy(param->template, name, len);
 99
100	i = 0;
101	for (;;) {
102		name = ++p;
103
104		for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
105			;
106
107		if (*p == '(') {
108			int recursion = 0;
109
110			for (;;) {
111				if (!*++p)
112					goto err_free_param;
113				if (*p == '(')
114					recursion++;
115				else if (*p == ')' && !recursion--)
116					break;
117			}
118
119			p++;
120		}
121
122		len = p - name;
123		if (!len)
124			goto err_free_param;
125
126		param->attrs[i].attr.rta_len = sizeof(param->attrs[i]);
127		param->attrs[i].attr.rta_type = CRYPTOA_ALG;
128		memcpy(param->attrs[i].data.name, name, len);
129
130		param->tb[i + 1] = &param->attrs[i].attr;
131		i++;
132
133		if (i >= CRYPTO_MAX_ATTRS)
134			goto err_free_param;
135
136		if (*p == ')')
137			break;
138
139		if (*p != ',')
140			goto err_free_param;
141	}
142
143	param->tb[i + 1] = NULL;
144
145	param->type.attr.rta_len = sizeof(param->type);
146	param->type.attr.rta_type = CRYPTOA_TYPE;
147	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
148	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
149	param->tb[0] = &param->type.attr;
150
151	param->otype = larval->alg.cra_flags;
152	param->omask = larval->mask;
153
154	crypto_alg_get(&larval->alg);
155	param->larval = larval;
156
157	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
158	if (IS_ERR(thread))
159		goto err_put_larval;
160
161	return NOTIFY_STOP;
162
163err_put_larval:
164	crypto_alg_put(&larval->alg);
165err_free_param:
166	kfree(param);
167err_put_module:
168	module_put(THIS_MODULE);
169err:
170	return NOTIFY_OK;
171}
172
173static int cryptomgr_test(void *data)
174{
175	struct crypto_test_param *param = data;
176	u32 type = param->type;
177	int err;
178
179	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
180
181	crypto_alg_tested(param->driver, err);
182
183	kfree(param);
184	module_put_and_kthread_exit(0);
185}
186
187static int cryptomgr_schedule_test(struct crypto_alg *alg)
188{
189	struct task_struct *thread;
190	struct crypto_test_param *param;
191
192	if (!IS_ENABLED(CONFIG_CRYPTO_SELFTESTS))
193		return NOTIFY_DONE;
194
195	if (!try_module_get(THIS_MODULE))
196		goto err;
197
198	param = kzalloc(sizeof(*param), GFP_KERNEL);
199	if (!param)
200		goto err_put_module;
201
202	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
203	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
204	param->type = alg->cra_flags;
205
206	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
207	if (IS_ERR(thread))
208		goto err_free_param;
209
210	return NOTIFY_STOP;
211
212err_free_param:
213	kfree(param);
214err_put_module:
215	module_put(THIS_MODULE);
216err:
217	return NOTIFY_OK;
218}
219
220static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
221			    void *data)
222{
223	switch (msg) {
224	case CRYPTO_MSG_ALG_REQUEST:
225		return cryptomgr_schedule_probe(data);
226	case CRYPTO_MSG_ALG_REGISTER:
227		return cryptomgr_schedule_test(data);
228	case CRYPTO_MSG_ALG_LOADED:
229		break;
230	}
231
232	return NOTIFY_DONE;
233}
234
235static struct notifier_block cryptomgr_notifier = {
236	.notifier_call = cryptomgr_notify,
237};
238
239static int __init cryptomgr_init(void)
240{
241	return crypto_register_notifier(&cryptomgr_notifier);
242}
243
244static void __exit cryptomgr_exit(void)
245{
246	int err = crypto_unregister_notifier(&cryptomgr_notifier);
247	BUG_ON(err);
248}
249
250module_init(cryptomgr_init);
251module_exit(cryptomgr_exit);
252
253MODULE_LICENSE("GPL");
254MODULE_DESCRIPTION("Crypto Algorithm Manager");