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(¶m->larval->completion); 75 crypto_alg_put(¶m->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] = ¶m->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] = ¶m->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"); 293