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 = -ENOENT; 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 param->larval->adult = ERR_PTR(err); 68 param->larval->alg.cra_flags |= CRYPTO_ALG_DEAD; 69 complete_all(¶m->larval->completion); 70 crypto_alg_put(¶m->larval->alg); 71 kfree(param); 72 module_put_and_kthread_exit(0); 73 } 74 75 static int cryptomgr_schedule_probe(struct crypto_larval *larval) 76 { 77 struct task_struct *thread; 78 struct cryptomgr_param *param; 79 const char *name = larval->alg.cra_name; 80 const char *p; 81 unsigned int len; 82 int i; 83 84 if (!try_module_get(THIS_MODULE)) 85 goto err; 86 87 param = kzalloc(sizeof(*param), GFP_KERNEL); 88 if (!param) 89 goto err_put_module; 90 91 for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) 92 ; 93 94 len = p - name; 95 if (!len || *p != '(') 96 goto err_free_param; 97 98 memcpy(param->template, name, len); 99 100 i = 0; 101 for (;;) { 102 name = ++p; 103 104 for (; isalnum(*p) || *p == '-' || *p == '_'; p++) 105 ; 106 107 if (*p == '(') { 108 int recursion = 0; 109 110 for (;;) { 111 if (!*++p) 112 goto err_free_param; 113 if (*p == '(') 114 recursion++; 115 else if (*p == ')' && !recursion--) 116 break; 117 } 118 119 p++; 120 } 121 122 len = p - name; 123 if (!len) 124 goto err_free_param; 125 126 param->attrs[i].attr.rta_len = sizeof(param->attrs[i]); 127 param->attrs[i].attr.rta_type = CRYPTOA_ALG; 128 memcpy(param->attrs[i].data.name, name, len); 129 130 param->tb[i + 1] = ¶m->attrs[i].attr; 131 i++; 132 133 if (i >= CRYPTO_MAX_ATTRS) 134 goto err_free_param; 135 136 if (*p == ')') 137 break; 138 139 if (*p != ',') 140 goto err_free_param; 141 } 142 143 param->tb[i + 1] = NULL; 144 145 param->type.attr.rta_len = sizeof(param->type); 146 param->type.attr.rta_type = CRYPTOA_TYPE; 147 param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; 148 param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; 149 param->tb[0] = ¶m->type.attr; 150 151 param->otype = larval->alg.cra_flags; 152 param->omask = larval->mask; 153 154 crypto_alg_get(&larval->alg); 155 param->larval = larval; 156 157 thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); 158 if (IS_ERR(thread)) 159 goto err_put_larval; 160 161 return NOTIFY_STOP; 162 163 err_put_larval: 164 crypto_alg_put(&larval->alg); 165 err_free_param: 166 kfree(param); 167 err_put_module: 168 module_put(THIS_MODULE); 169 err: 170 return NOTIFY_OK; 171 } 172 173 static int cryptomgr_test(void *data) 174 { 175 struct crypto_test_param *param = data; 176 u32 type = param->type; 177 int err; 178 179 err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); 180 181 crypto_alg_tested(param->driver, err); 182 183 kfree(param); 184 module_put_and_kthread_exit(0); 185 } 186 187 static int cryptomgr_schedule_test(struct crypto_alg *alg) 188 { 189 struct task_struct *thread; 190 struct crypto_test_param *param; 191 192 if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS)) 193 return NOTIFY_DONE; 194 195 if (!try_module_get(THIS_MODULE)) 196 goto err; 197 198 param = kzalloc(sizeof(*param), GFP_KERNEL); 199 if (!param) 200 goto err_put_module; 201 202 memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); 203 memcpy(param->alg, alg->cra_name, sizeof(param->alg)); 204 param->type = alg->cra_flags; 205 206 thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); 207 if (IS_ERR(thread)) 208 goto err_free_param; 209 210 return NOTIFY_STOP; 211 212 err_free_param: 213 kfree(param); 214 err_put_module: 215 module_put(THIS_MODULE); 216 err: 217 return NOTIFY_OK; 218 } 219 220 static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, 221 void *data) 222 { 223 switch (msg) { 224 case CRYPTO_MSG_ALG_REQUEST: 225 return cryptomgr_schedule_probe(data); 226 case CRYPTO_MSG_ALG_REGISTER: 227 return cryptomgr_schedule_test(data); 228 case CRYPTO_MSG_ALG_LOADED: 229 break; 230 } 231 232 return NOTIFY_DONE; 233 } 234 235 static struct notifier_block cryptomgr_notifier = { 236 .notifier_call = cryptomgr_notify, 237 }; 238 239 static int __init cryptomgr_init(void) 240 { 241 return crypto_register_notifier(&cryptomgr_notifier); 242 } 243 244 static void __exit cryptomgr_exit(void) 245 { 246 int err = crypto_unregister_notifier(&cryptomgr_notifier); 247 BUG_ON(err); 248 } 249 250 /* 251 * This is arch_initcall() so that the crypto self-tests are run on algorithms 252 * registered early by subsys_initcall(). subsys_initcall() is needed for 253 * generic implementations so that they're available for comparison tests when 254 * other implementations are registered later by module_init(). 255 */ 256 arch_initcall(cryptomgr_init); 257 module_exit(cryptomgr_exit); 258 259 MODULE_LICENSE("GPL"); 260 MODULE_DESCRIPTION("Crypto Algorithm Manager"); 261