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         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
  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(&param->larval->completion);
  68         crypto_alg_put(&param->larval->alg);
  69         kfree(param);
  70         module_put_and_exit(0);
  71 }
  72
  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] = &param->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] = &param->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
 174 static int cryptomgr_test(void *data)
 175 {
 176         struct crypto_test_param *param = data;
 177         u32 type = param->type;
 178         int err = 0;
 179
 180 #ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
 181         goto skiptest;
 182 #endif
 183
 184         if (type & CRYPTO_ALG_TESTED)
 185                 goto skiptest;
 186
 187         err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
 188
 189 skiptest:
 190         crypto_alg_tested(param->driver, err);
 191
 192         kfree(param);
 193         module_put_and_exit(0);
 194 }
 195
 196 static int cryptomgr_schedule_test(struct crypto_alg *alg)
 197 {
 198         struct task_struct *thread;
 199         struct crypto_test_param *param;
 200         u32 type;
 201
 202         if (!try_module_get(THIS_MODULE))
 203                 goto err;
 204
 205         param = kzalloc(sizeof(*param), GFP_KERNEL);
 206         if (!param)
 207                 goto err_put_module;
 208
 209         memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
 210         memcpy(param->alg, alg->cra_name, sizeof(param->alg));
 211         type = alg->cra_flags;
 212
 213         /* Do not test internal algorithms. */
 214         if (type & CRYPTO_ALG_INTERNAL)
 215                 type |= CRYPTO_ALG_TESTED;
 216
 217         param->type = type;
 218
 219         thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
 220         if (IS_ERR(thread))
 221                 goto err_free_param;
 222
 223         return NOTIFY_STOP;
 224
 225 err_free_param:
 226         kfree(param);
 227 err_put_module:
 228         module_put(THIS_MODULE);
 229 err:
 230         return NOTIFY_OK;
 231 }
 232
 233 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
 234                             void *data)
 235 {
 236         switch (msg) {
 237         case CRYPTO_MSG_ALG_REQUEST:
 238                 return cryptomgr_schedule_probe(data);
 239         case CRYPTO_MSG_ALG_REGISTER:
 240                 return cryptomgr_schedule_test(data);
 241         case CRYPTO_MSG_ALG_LOADED:
 242                 break;
 243         }
 244
 245         return NOTIFY_DONE;
 246 }
 247
 248 static struct notifier_block cryptomgr_notifier = {
 249         .notifier_call = cryptomgr_notify,
 250 };
 251
 252 static int __init cryptomgr_init(void)
 253 {
 254         return crypto_register_notifier(&cryptomgr_notifier);
 255 }
 256
 257 static void __exit cryptomgr_exit(void)
 258 {
 259         int err = crypto_unregister_notifier(&cryptomgr_notifier);
 260         BUG_ON(err);
 261 }
 262
 263 /*
 264  * This is arch_initcall() so that the crypto self-tests are run on algorithms
 265  * registered early by subsys_initcall().  subsys_initcall() is needed for
 266  * generic implementations so that they're available for comparison tests when
 267  * other implementations are registered later by module_init().
 268  */
 269 arch_initcall(cryptomgr_init);
 270 module_exit(cryptomgr_exit);
 271
 272 MODULE_LICENSE("GPL");
 273 MODULE_DESCRIPTION("Crypto Algorithm Manager");