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crypto/algboss.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * Create default crypto algorithm instances. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
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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> #include <linux/err.h> #include <linux/init.h> |
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#include <linux/kthread.h> |
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#include <linux/module.h> #include <linux/notifier.h> #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" struct cryptomgr_param { |
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struct rtattr *tb[CRYPTO_MAX_ATTRS + 2]; |
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struct { struct rtattr attr; struct crypto_attr_type data; } type; |
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union { |
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struct rtattr attr; |
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struct { struct rtattr attr; struct crypto_attr_alg data; } alg; struct { struct rtattr attr; struct crypto_attr_u32 data; } nu32; } 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; u32 omask; }; struct crypto_test_param { char driver[CRYPTO_MAX_ALG_NAME]; char alg[CRYPTO_MAX_ALG_NAME]; 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); if (!tmpl) |
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goto out; |
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|
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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); out: |
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complete_all(¶m->larval->completion); crypto_alg_put(¶m->larval->alg); |
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kfree(param); |
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module_put_and_exit(0); |
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} static int cryptomgr_schedule_probe(struct crypto_larval *larval) { |
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struct task_struct *thread; |
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struct cryptomgr_param *param; const char *name = larval->alg.cra_name; const char *p; unsigned int len; |
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int i; |
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if (!try_module_get(THIS_MODULE)) 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++) ; len = p - name; if (!len || *p != '(') goto err_free_param; memcpy(param->template, name, len); |
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i = 0; for (;;) { int notnum = 0; |
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|
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name = ++p; |
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for (; isalnum(*p) || *p == '-' || *p == '_'; p++) notnum |= !isdigit(*p); if (*p == '(') { int recursion = 0; for (;;) { if (!*++p) goto err_free_param; if (*p == '(') recursion++; else if (*p == ')' && !recursion--) break; } notnum = 1; |
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p++; |
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} |
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len = p - name; |
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if (!len) goto err_free_param; if (notnum) { param->attrs[i].alg.attr.rta_len = sizeof(param->attrs[i].alg); param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG; memcpy(param->attrs[i].alg.data.name, name, len); } else { param->attrs[i].nu32.attr.rta_len = sizeof(param->attrs[i].nu32); param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32; param->attrs[i].nu32.data.num = simple_strtol(name, NULL, 0); } param->tb[i + 1] = ¶m->attrs[i].attr; i++; |
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if (i >= CRYPTO_MAX_ATTRS) |
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goto err_free_param; if (*p == ')') break; if (*p != ',') 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); param->type.attr.rta_type = CRYPTOA_TYPE; |
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param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED; 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; param->omask = larval->mask; |
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crypto_alg_get(&larval->alg); param->larval = larval; |
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thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe"); 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: crypto_alg_put(&larval->alg); |
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err_free_param: kfree(param); err_put_module: module_put(THIS_MODULE); err: return NOTIFY_OK; } static int cryptomgr_test(void *data) { struct crypto_test_param *param = data; u32 type = param->type; int err = 0; |
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#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS goto skiptest; #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: crypto_alg_tested(param->driver, err); kfree(param); module_put_and_exit(0); } static int cryptomgr_schedule_test(struct crypto_alg *alg) { struct task_struct *thread; struct crypto_test_param *param; |
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u32 type; |
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if (!try_module_get(THIS_MODULE)) goto err; param = kzalloc(sizeof(*param), GFP_KERNEL); if (!param) goto err_put_module; memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver)); 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. */ if (type & CRYPTO_ALG_INTERNAL) |
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type |= CRYPTO_ALG_TESTED; 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; err_free_param: kfree(param); |
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err_put_module: module_put(THIS_MODULE); |
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err: return NOTIFY_OK; } static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, void *data) { switch (msg) { case CRYPTO_MSG_ALG_REQUEST: return cryptomgr_schedule_probe(data); |
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case CRYPTO_MSG_ALG_REGISTER: return cryptomgr_schedule_test(data); |
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case CRYPTO_MSG_ALG_LOADED: break; |
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} return NOTIFY_DONE; } static struct notifier_block cryptomgr_notifier = { .notifier_call = cryptomgr_notify, }; static int __init cryptomgr_init(void) { |
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return crypto_register_notifier(&cryptomgr_notifier); |
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} static void __exit cryptomgr_exit(void) { int err = crypto_unregister_notifier(&cryptomgr_notifier); BUG_ON(err); } |
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/* * This is arch_initcall() so that the crypto self-tests are run on algorithms * registered early by subsys_initcall(). subsys_initcall() is needed for * generic implementations so that they're available for comparison tests when * other implementations are registered later by module_init(). */ arch_initcall(cryptomgr_init); |
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module_exit(cryptomgr_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Crypto Algorithm Manager"); |