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 = -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
66 out:
67 param->larval->adult = ERR_PTR(err);
68 param->larval->alg.cra_flags |= CRYPTO_ALG_DEAD;
69 complete_all(¶m->larval->completion);
70 crypto_alg_put(¶m->larval->alg);
71 kfree(param);
72 module_put_and_kthread_exit(0);
73 }
74
cryptomgr_schedule_probe(struct crypto_larval * larval)75 static 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] = ¶m->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] = ¶m->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
163 err_put_larval:
164 crypto_alg_put(&larval->alg);
165 err_free_param:
166 kfree(param);
167 err_put_module:
168 module_put(THIS_MODULE);
169 err:
170 return NOTIFY_OK;
171 }
172
cryptomgr_test(void * data)173 static 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
cryptomgr_schedule_test(struct crypto_alg * alg)187 static 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_MANAGER_DISABLE_TESTS))
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
212 err_free_param:
213 kfree(param);
214 err_put_module:
215 module_put(THIS_MODULE);
216 err:
217 return NOTIFY_OK;
218 }
219
cryptomgr_notify(struct notifier_block * this,unsigned long msg,void * data)220 static 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
235 static struct notifier_block cryptomgr_notifier = {
236 .notifier_call = cryptomgr_notify,
237 };
238
cryptomgr_init(void)239 static int __init cryptomgr_init(void)
240 {
241 return crypto_register_notifier(&cryptomgr_notifier);
242 }
243
cryptomgr_exit(void)244 static void __exit cryptomgr_exit(void)
245 {
246 int err = crypto_unregister_notifier(&cryptomgr_notifier);
247 BUG_ON(err);
248 }
249
250 /*
251 * This is arch_initcall() so that the crypto self-tests are run on algorithms
252 * registered early by subsys_initcall(). subsys_initcall() is needed for
253 * generic implementations so that they're available for comparison tests when
254 * other implementations are registered later by module_init().
255 */
256 arch_initcall(cryptomgr_init);
257 module_exit(cryptomgr_exit);
258
259 MODULE_LICENSE("GPL");
260 MODULE_DESCRIPTION("Crypto Algorithm Manager");
261