crypto/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
  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");