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TOMOYO Linux Cross Reference
Linux/crypto/algboss.c

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  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 
 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(&param->larval->completion);
 85         crypto_alg_put(&param->larval->alg);
 86         kfree(param);
 87         module_put_and_exit(0);
 88 }
 89 
 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] = &param->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] = &param->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 
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 
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 
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 
283 static int __init cryptomgr_init(void)
284 {
285         return crypto_register_notifier(&cryptomgr_notifier);
286 }
287 
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 

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