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273 lines
5.5 KiB
273 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Create default crypto algorithm instances. |
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* |
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* Copyright (c) 2006 Herbert Xu <[email protected]> |
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*/ |
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#include <crypto/internal/aead.h> |
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#include <linux/completion.h> |
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#include <linux/ctype.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kthread.h> |
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#include <linux/module.h> |
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#include <linux/notifier.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/sched/signal.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include "internal.h" |
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struct cryptomgr_param { |
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struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; |
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struct { |
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struct rtattr attr; |
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struct crypto_attr_type data; |
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} type; |
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struct { |
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struct rtattr attr; |
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struct crypto_attr_alg data; |
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} attrs[CRYPTO_MAX_ATTRS]; |
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char template[CRYPTO_MAX_ALG_NAME]; |
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struct crypto_larval *larval; |
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u32 otype; |
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u32 omask; |
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}; |
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struct crypto_test_param { |
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char driver[CRYPTO_MAX_ALG_NAME]; |
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char alg[CRYPTO_MAX_ALG_NAME]; |
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u32 type; |
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}; |
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static int cryptomgr_probe(void *data) |
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{ |
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struct cryptomgr_param *param = data; |
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struct crypto_template *tmpl; |
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int err; |
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tmpl = crypto_lookup_template(param->template); |
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if (!tmpl) |
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goto out; |
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do { |
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err = tmpl->create(tmpl, param->tb); |
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} while (err == -EAGAIN && !signal_pending(current)); |
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crypto_tmpl_put(tmpl); |
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out: |
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complete_all(¶m->larval->completion); |
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crypto_alg_put(¶m->larval->alg); |
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kfree(param); |
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module_put_and_kthread_exit(0); |
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} |
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static int cryptomgr_schedule_probe(struct crypto_larval *larval) |
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{ |
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struct task_struct *thread; |
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struct cryptomgr_param *param; |
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const char *name = larval->alg.cra_name; |
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const char *p; |
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unsigned int len; |
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int i; |
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if (!try_module_get(THIS_MODULE)) |
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goto err; |
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param = kzalloc(sizeof(*param), GFP_KERNEL); |
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if (!param) |
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goto err_put_module; |
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for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++) |
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; |
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len = p - name; |
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if (!len || *p != '(') |
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goto err_free_param; |
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memcpy(param->template, name, len); |
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i = 0; |
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for (;;) { |
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name = ++p; |
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for (; isalnum(*p) || *p == '-' || *p == '_'; p++) |
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; |
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if (*p == '(') { |
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int recursion = 0; |
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for (;;) { |
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if (!*++p) |
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goto err_free_param; |
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if (*p == '(') |
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recursion++; |
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else if (*p == ')' && !recursion--) |
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break; |
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} |
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p++; |
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} |
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len = p - name; |
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if (!len) |
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goto err_free_param; |
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param->attrs[i].attr.rta_len = sizeof(param->attrs[i]); |
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param->attrs[i].attr.rta_type = CRYPTOA_ALG; |
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memcpy(param->attrs[i].data.name, name, len); |
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param->tb[i + 1] = ¶m->attrs[i].attr; |
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i++; |
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if (i >= CRYPTO_MAX_ATTRS) |
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goto err_free_param; |
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if (*p == ')') |
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break; |
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if (*p != ',') |
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goto err_free_param; |
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} |
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if (!i) |
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goto err_free_param; |
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param->tb[i + 1] = NULL; |
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param->type.attr.rta_len = sizeof(param->type); |
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param->type.attr.rta_type = CRYPTOA_TYPE; |
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param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; |
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param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED; |
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param->tb[0] = ¶m->type.attr; |
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param->otype = larval->alg.cra_flags; |
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param->omask = larval->mask; |
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crypto_alg_get(&larval->alg); |
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param->larval = larval; |
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thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); |
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if (IS_ERR(thread)) |
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goto err_put_larval; |
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return NOTIFY_STOP; |
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err_put_larval: |
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crypto_alg_put(&larval->alg); |
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err_free_param: |
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kfree(param); |
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err_put_module: |
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module_put(THIS_MODULE); |
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err: |
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return NOTIFY_OK; |
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} |
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static int cryptomgr_test(void *data) |
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{ |
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struct crypto_test_param *param = data; |
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u32 type = param->type; |
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int err = 0; |
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#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS |
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goto skiptest; |
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#endif |
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if (type & CRYPTO_ALG_TESTED) |
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goto skiptest; |
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err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED); |
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skiptest: |
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crypto_alg_tested(param->driver, err); |
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kfree(param); |
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module_put_and_kthread_exit(0); |
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} |
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static int cryptomgr_schedule_test(struct crypto_alg *alg) |
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{ |
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struct task_struct *thread; |
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struct crypto_test_param *param; |
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u32 type; |
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if (!try_module_get(THIS_MODULE)) |
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goto err; |
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param = kzalloc(sizeof(*param), GFP_KERNEL); |
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if (!param) |
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goto err_put_module; |
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memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); |
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memcpy(param->alg, alg->cra_name, sizeof(param->alg)); |
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type = alg->cra_flags; |
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/* Do not test internal algorithms. */ |
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if (type & CRYPTO_ALG_INTERNAL) |
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type |= CRYPTO_ALG_TESTED; |
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param->type = type; |
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thread = kthread_run(cryptomgr_test, param, "cryptomgr_test"); |
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if (IS_ERR(thread)) |
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goto err_free_param; |
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return NOTIFY_STOP; |
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err_free_param: |
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kfree(param); |
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err_put_module: |
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module_put(THIS_MODULE); |
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err: |
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return NOTIFY_OK; |
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} |
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static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, |
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void *data) |
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{ |
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switch (msg) { |
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case CRYPTO_MSG_ALG_REQUEST: |
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return cryptomgr_schedule_probe(data); |
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case CRYPTO_MSG_ALG_REGISTER: |
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return cryptomgr_schedule_test(data); |
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case CRYPTO_MSG_ALG_LOADED: |
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break; |
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} |
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return NOTIFY_DONE; |
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} |
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static struct notifier_block cryptomgr_notifier = { |
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.notifier_call = cryptomgr_notify, |
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}; |
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static int __init cryptomgr_init(void) |
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{ |
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return crypto_register_notifier(&cryptomgr_notifier); |
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} |
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static void __exit cryptomgr_exit(void) |
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{ |
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int err = crypto_unregister_notifier(&cryptomgr_notifier); |
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BUG_ON(err); |
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} |
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/* |
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* This is arch_initcall() so that the crypto self-tests are run on algorithms |
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* registered early by subsys_initcall(). subsys_initcall() is needed for |
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* generic implementations so that they're available for comparison tests when |
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* other implementations are registered later by module_init(). |
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*/ |
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arch_initcall(cryptomgr_init); |
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module_exit(cryptomgr_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Crypto Algorithm Manager");
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