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