261 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 23struct 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 44struct crypto_test_param {45 char driver[CRYPTO_MAX_ALG_NAME];46 char alg[CRYPTO_MAX_ALG_NAME];47 u32 type;48};49 50static 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 66out: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 75static 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 163err_put_larval:164 crypto_alg_put(&larval->alg);165err_free_param:166 kfree(param);167err_put_module:168 module_put(THIS_MODULE);169err:170 return NOTIFY_OK;171}172 173static 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 187static 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 212err_free_param:213 kfree(param);214err_put_module:215 module_put(THIS_MODULE);216err:217 return NOTIFY_OK;218}219 220static 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 235static struct notifier_block cryptomgr_notifier = {236 .notifier_call = cryptomgr_notify,237};238 239static int __init cryptomgr_init(void)240{241 return crypto_register_notifier(&cryptomgr_notifier);242}243 244static 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 algorithms252 * registered early by subsys_initcall(). subsys_initcall() is needed for253 * generic implementations so that they're available for comparison tests when254 * other implementations are registered later by module_init().255 */256arch_initcall(cryptomgr_init);257module_exit(cryptomgr_exit);258 259MODULE_LICENSE("GPL");260MODULE_DESCRIPTION("Crypto Algorithm Manager");261