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(¶m->larval->completion); 68 crypto_alg_put(¶m->larval->alg); 69 kfree(param); 70 module_put_and_kthread_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] = ¶m->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] = ¶m->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_kthread_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"); 274