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
23 struct 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 union {
32 struct rtattr attr;
33 struct {
34 struct rtattr attr;
35 struct crypto_attr_alg data;
36 } alg;
37 struct {
38 struct rtattr attr;
39 struct crypto_attr_u32 data;
40 } nu32;
41 } attrs[CRYPTO_MAX_ATTRS];
42
43 char template[CRYPTO_MAX_ALG_NAME];
44
45 struct crypto_larval *larval;
46
47 u32 otype;
48 u32 omask;
49 };
50
51 struct crypto_test_param {
52 char driver[CRYPTO_MAX_ALG_NAME];
53 char alg[CRYPTO_MAX_ALG_NAME];
54 u32 type;
55 };
56
cryptomgr_probe(void * data)57 static int cryptomgr_probe(void *data)
58 {
59 struct cryptomgr_param *param = data;
60 struct crypto_template *tmpl;
61 struct crypto_instance *inst;
62 int err;
63
64 tmpl = crypto_lookup_template(param->template);
65 if (!tmpl)
66 goto out;
67
68 do {
69 if (tmpl->create) {
70 err = tmpl->create(tmpl, param->tb);
71 continue;
72 }
73
74 inst = tmpl->alloc(param->tb);
75 if (IS_ERR(inst))
76 err = PTR_ERR(inst);
77 else if ((err = crypto_register_instance(tmpl, inst)))
78 tmpl->free(inst);
79 } while (err == -EAGAIN && !signal_pending(current));
80
81 crypto_tmpl_put(tmpl);
82
83 out:
84 complete_all(¶m->larval->completion);
85 crypto_alg_put(¶m->larval->alg);
86 kfree(param);
87 module_put_and_exit(0);
88 }
89
cryptomgr_schedule_probe(struct crypto_larval * larval)90 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
91 {
92 struct task_struct *thread;
93 struct cryptomgr_param *param;
94 const char *name = larval->alg.cra_name;
95 const char *p;
96 unsigned int len;
97 int i;
98
99 if (!try_module_get(THIS_MODULE))
100 goto err;
101
102 param = kzalloc(sizeof(*param), GFP_KERNEL);
103 if (!param)
104 goto err_put_module;
105
106 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
107 ;
108
109 len = p - name;
110 if (!len || *p != '(')
111 goto err_free_param;
112
113 memcpy(param->template, name, len);
114
115 i = 0;
116 for (;;) {
117 int notnum = 0;
118
119 name = ++p;
120
121 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
122 notnum |= !isdigit(*p);
123
124 if (*p == '(') {
125 int recursion = 0;
126
127 for (;;) {
128 if (!*++p)
129 goto err_free_param;
130 if (*p == '(')
131 recursion++;
132 else if (*p == ')' && !recursion--)
133 break;
134 }
135
136 notnum = 1;
137 p++;
138 }
139
140 len = p - name;
141 if (!len)
142 goto err_free_param;
143
144 if (notnum) {
145 param->attrs[i].alg.attr.rta_len =
146 sizeof(param->attrs[i].alg);
147 param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
148 memcpy(param->attrs[i].alg.data.name, name, len);
149 } else {
150 param->attrs[i].nu32.attr.rta_len =
151 sizeof(param->attrs[i].nu32);
152 param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
153 param->attrs[i].nu32.data.num =
154 simple_strtol(name, NULL, 0);
155 }
156
157 param->tb[i + 1] = ¶m->attrs[i].attr;
158 i++;
159
160 if (i >= CRYPTO_MAX_ATTRS)
161 goto err_free_param;
162
163 if (*p == ')')
164 break;
165
166 if (*p != ',')
167 goto err_free_param;
168 }
169
170 if (!i)
171 goto err_free_param;
172
173 param->tb[i + 1] = NULL;
174
175 param->type.attr.rta_len = sizeof(param->type);
176 param->type.attr.rta_type = CRYPTOA_TYPE;
177 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
178 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
179 param->tb[0] = ¶m->type.attr;
180
181 param->otype = larval->alg.cra_flags;
182 param->omask = larval->mask;
183
184 crypto_alg_get(&larval->alg);
185 param->larval = larval;
186
187 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
188 if (IS_ERR(thread))
189 goto err_put_larval;
190
191 wait_for_completion_interruptible(&larval->completion);
192
193 return NOTIFY_STOP;
194
195 err_put_larval:
196 crypto_alg_put(&larval->alg);
197 err_free_param:
198 kfree(param);
199 err_put_module:
200 module_put(THIS_MODULE);
201 err:
202 return NOTIFY_OK;
203 }
204
cryptomgr_test(void * data)205 static int cryptomgr_test(void *data)
206 {
207 struct crypto_test_param *param = data;
208 u32 type = param->type;
209 int err = 0;
210
211 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
212 goto skiptest;
213 #endif
214
215 if (type & CRYPTO_ALG_TESTED)
216 goto skiptest;
217
218 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
219
220 skiptest:
221 crypto_alg_tested(param->driver, err);
222
223 kfree(param);
224 module_put_and_exit(0);
225 }
226
cryptomgr_schedule_test(struct crypto_alg * alg)227 static int cryptomgr_schedule_test(struct crypto_alg *alg)
228 {
229 struct task_struct *thread;
230 struct crypto_test_param *param;
231 u32 type;
232
233 if (!try_module_get(THIS_MODULE))
234 goto err;
235
236 param = kzalloc(sizeof(*param), GFP_KERNEL);
237 if (!param)
238 goto err_put_module;
239
240 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
241 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
242 type = alg->cra_flags;
243
244 /* Do not test internal algorithms. */
245 if (type & CRYPTO_ALG_INTERNAL)
246 type |= CRYPTO_ALG_TESTED;
247
248 param->type = type;
249
250 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
251 if (IS_ERR(thread))
252 goto err_free_param;
253
254 return NOTIFY_STOP;
255
256 err_free_param:
257 kfree(param);
258 err_put_module:
259 module_put(THIS_MODULE);
260 err:
261 return NOTIFY_OK;
262 }
263
cryptomgr_notify(struct notifier_block * this,unsigned long msg,void * data)264 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
265 void *data)
266 {
267 switch (msg) {
268 case CRYPTO_MSG_ALG_REQUEST:
269 return cryptomgr_schedule_probe(data);
270 case CRYPTO_MSG_ALG_REGISTER:
271 return cryptomgr_schedule_test(data);
272 case CRYPTO_MSG_ALG_LOADED:
273 break;
274 }
275
276 return NOTIFY_DONE;
277 }
278
279 static struct notifier_block cryptomgr_notifier = {
280 .notifier_call = cryptomgr_notify,
281 };
282
cryptomgr_init(void)283 static int __init cryptomgr_init(void)
284 {
285 return crypto_register_notifier(&cryptomgr_notifier);
286 }
287
cryptomgr_exit(void)288 static void __exit cryptomgr_exit(void)
289 {
290 int err = crypto_unregister_notifier(&cryptomgr_notifier);
291 BUG_ON(err);
292 }
293
294 /*
295 * This is arch_initcall() so that the crypto self-tests are run on algorithms
296 * registered early by subsys_initcall(). subsys_initcall() is needed for
297 * generic implementations so that they're available for comparison tests when
298 * other implementations are registered later by module_init().
299 */
300 arch_initcall(cryptomgr_init);
301 module_exit(cryptomgr_exit);
302
303 MODULE_LICENSE("GPL");
304 MODULE_DESCRIPTION("Crypto Algorithm Manager");
305
