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 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
44 struct crypto_test_param {
45 char driver[CRYPTO_MAX_ALG_NAME];
46 char alg[CRYPTO_MAX_ALG_NAME];
47 u32 type;
48 };
49
cryptomgr_probe(void * data)50 static int cryptomgr_probe(void *data)
51 {
52 struct cryptomgr_param *param = data;
53 struct crypto_template *tmpl;
54 int err;
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
66 out:
67 complete_all(¶m->larval->completion);
68 crypto_alg_put(¶m->larval->alg);
69 kfree(param);
70 module_put_and_exit(0);
71 }
72
cryptomgr_schedule_probe(struct crypto_larval * larval)73 static int cryptomgr_schedule_probe(struct crypto_larval *larval)
74 {
75 struct task_struct *thread;
76 struct cryptomgr_param *param;
77 const char *name = larval->alg.cra_name;
78 const char *p;
79 unsigned int len;
80 int i;
81
82 if (!try_module_get(THIS_MODULE))
83 goto err;
84
85 param = kzalloc(sizeof(*param), GFP_KERNEL);
86 if (!param)
87 goto err_put_module;
88
89 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
90 ;
91
92 len = p - name;
93 if (!len || *p != '(')
94 goto err_free_param;
95
96 memcpy(param->template, name, len);
97
98 i = 0;
99 for (;;) {
100 name = ++p;
101
102 for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
103 ;
104
105 if (*p == '(') {
106 int recursion = 0;
107
108 for (;;) {
109 if (!*++p)
110 goto err_free_param;
111 if (*p == '(')
112 recursion++;
113 else if (*p == ')' && !recursion--)
114 break;
115 }
116
117 p++;
118 }
119
120 len = p - name;
121 if (!len)
122 goto err_free_param;
123
124 param->attrs[i].attr.rta_len = sizeof(param->attrs[i]);
125 param->attrs[i].attr.rta_type = CRYPTOA_ALG;
126 memcpy(param->attrs[i].data.name, name, len);
127
128 param->tb[i + 1] = ¶m->attrs[i].attr;
129 i++;
130
131 if (i >= CRYPTO_MAX_ATTRS)
132 goto err_free_param;
133
134 if (*p == ')')
135 break;
136
137 if (*p != ',')
138 goto err_free_param;
139 }
140
141 if (!i)
142 goto err_free_param;
143
144 param->tb[i + 1] = NULL;
145
146 param->type.attr.rta_len = sizeof(param->type);
147 param->type.attr.rta_type = CRYPTOA_TYPE;
148 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
149 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
150 param->tb[0] = ¶m->type.attr;
151
152 param->otype = larval->alg.cra_flags;
153 param->omask = larval->mask;
154
155 crypto_alg_get(&larval->alg);
156 param->larval = larval;
157
158 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
159 if (IS_ERR(thread))
160 goto err_put_larval;
161
162 return NOTIFY_STOP;
163
164 err_put_larval:
165 crypto_alg_put(&larval->alg);
166 err_free_param:
167 kfree(param);
168 err_put_module:
169 module_put(THIS_MODULE);
170 err:
171 return NOTIFY_OK;
172 }
173
cryptomgr_test(void * data)174 static int cryptomgr_test(void *data)
175 {
176 struct crypto_test_param *param = data;
177 u32 type = param->type;
178 int err;
179
180 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
181
182 crypto_alg_tested(param->driver, err);
183
184 kfree(param);
185 module_put_and_exit(0);
186 }
187
cryptomgr_schedule_test(struct crypto_alg * alg)188 static int cryptomgr_schedule_test(struct crypto_alg *alg)
189 {
190 struct task_struct *thread;
191 struct crypto_test_param *param;
192
193 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
194 return NOTIFY_DONE;
195
196 if (!try_module_get(THIS_MODULE))
197 goto err;
198
199 param = kzalloc(sizeof(*param), GFP_KERNEL);
200 if (!param)
201 goto err_put_module;
202
203 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
204 memcpy(param->alg, alg->cra_name, sizeof(param->alg));
205 param->type = alg->cra_flags;
206
207 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
208 if (IS_ERR(thread))
209 goto err_free_param;
210
211 return NOTIFY_STOP;
212
213 err_free_param:
214 kfree(param);
215 err_put_module:
216 module_put(THIS_MODULE);
217 err:
218 return NOTIFY_OK;
219 }
220
cryptomgr_notify(struct notifier_block * this,unsigned long msg,void * data)221 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
222 void *data)
223 {
224 switch (msg) {
225 case CRYPTO_MSG_ALG_REQUEST:
226 return cryptomgr_schedule_probe(data);
227 case CRYPTO_MSG_ALG_REGISTER:
228 return cryptomgr_schedule_test(data);
229 case CRYPTO_MSG_ALG_LOADED:
230 break;
231 }
232
233 return NOTIFY_DONE;
234 }
235
236 static struct notifier_block cryptomgr_notifier = {
237 .notifier_call = cryptomgr_notify,
238 };
239
cryptomgr_init(void)240 static int __init cryptomgr_init(void)
241 {
242 return crypto_register_notifier(&cryptomgr_notifier);
243 }
244
cryptomgr_exit(void)245 static void __exit cryptomgr_exit(void)
246 {
247 int err = crypto_unregister_notifier(&cryptomgr_notifier);
248 BUG_ON(err);
249 }
250
251 /*
252 * This is arch_initcall() so that the crypto self-tests are run on algorithms
253 * registered early by subsys_initcall(). subsys_initcall() is needed for
254 * generic implementations so that they're available for comparison tests when
255 * other implementations are registered later by module_init().
256 */
257 arch_initcall(cryptomgr_init);
258 module_exit(cryptomgr_exit);
259
260 MODULE_LICENSE("GPL");
261 MODULE_DESCRIPTION("Crypto Algorithm Manager");
262