[linux.git] / crypto / algboss.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Create default crypto algorithm instances.
 *
 * Copyright (c) 2006 Herbert Xu <[email protected]>
 */

#include <crypto/internal/aead.h>
#include <linux/completion.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/rtnetlink.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/string.h>

#include "internal.h"

struct cryptomgr_param {
	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];

	struct {
		struct rtattr attr;
		struct crypto_attr_type data;
	} type;

	union {
		struct rtattr attr;
		struct {
			struct rtattr attr;
			struct crypto_attr_alg data;
		} alg;
		struct {
			struct rtattr attr;
			struct crypto_attr_u32 data;
		} nu32;
	} attrs[CRYPTO_MAX_ATTRS];

	char template[CRYPTO_MAX_ALG_NAME];

	struct crypto_larval *larval;

	u32 otype;
	u32 omask;
};

struct crypto_test_param {
	char driver[CRYPTO_MAX_ALG_NAME];
	char alg[CRYPTO_MAX_ALG_NAME];
	u32 type;
};

static int cryptomgr_probe(void *data)
{
	struct cryptomgr_param *param = data;
	struct crypto_template *tmpl;
	int err;

	tmpl = crypto_lookup_template(param->template);
	if (!tmpl)
		goto out;

	do {
		err = tmpl->create(tmpl, param->tb);
	} while (err == -EAGAIN && !signal_pending(current));

	crypto_tmpl_put(tmpl);

out:
	complete_all(&param->larval->completion);
	crypto_alg_put(&param->larval->alg);
	kfree(param);
	module_put_and_exit(0);
}

static int cryptomgr_schedule_probe(struct crypto_larval *larval)
{
	struct task_struct *thread;
	struct cryptomgr_param *param;
	const char *name = larval->alg.cra_name;
	const char *p;
	unsigned int len;
	int i;

	if (!try_module_get(THIS_MODULE))
		goto err;

	param = kzalloc(sizeof(*param), GFP_KERNEL);
	if (!param)
		goto err_put_module;

	for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
		;

	len = p - name;
	if (!len || *p != '(')
		goto err_free_param;

	memcpy(param->template, name, len);

	i = 0;
	for (;;) {
		int notnum = 0;

		name = ++p;

		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;
			p++;
		}

		len = p - name;
		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] = &param->attrs[i].attr;
		i++;

		if (i >= CRYPTO_MAX_ATTRS)
			goto err_free_param;

		if (*p == ')')
			break;

		if (*p != ',')
			goto err_free_param;
	}

	if (!i)
		goto err_free_param;

	param->tb[i + 1] = NULL;

	param->type.attr.rta_len = sizeof(param->type);
	param->type.attr.rta_type = CRYPTOA_TYPE;
	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
	param->tb[0] = &param->type.attr;

	param->otype = larval->alg.cra_flags;
	param->omask = larval->mask;

	crypto_alg_get(&larval->alg);
	param->larval = larval;

	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
	if (IS_ERR(thread))
		goto err_put_larval;

	return NOTIFY_STOP;

err_put_larval:
	crypto_alg_put(&larval->alg);
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;

#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
	goto skiptest;
#endif

	if (type & CRYPTO_ALG_TESTED)
		goto skiptest;

	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);

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;
	u32 type;

	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));
	type = alg->cra_flags;

	/* Do not test internal algorithms. */
	if (type & CRYPTO_ALG_INTERNAL)
		type |= CRYPTO_ALG_TESTED;

	param->type = type;

	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
	if (IS_ERR(thread))
		goto err_free_param;

	return NOTIFY_STOP;

err_free_param:
	kfree(param);
err_put_module:
	module_put(THIS_MODULE);
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);
	case CRYPTO_MSG_ALG_REGISTER:
		return cryptomgr_schedule_test(data);
	case CRYPTO_MSG_ALG_LOADED:
		break;
	}

	return NOTIFY_DONE;
}

static struct notifier_block cryptomgr_notifier = {
	.notifier_call = cryptomgr_notify,
};

static int __init cryptomgr_init(void)
{
	return crypto_register_notifier(&cryptomgr_notifier);
}

static void __exit cryptomgr_exit(void)
{
	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	BUG_ON(err);
}

/*
 * 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);
module_exit(cryptomgr_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Crypto Algorithm Manager");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
2b8c19db HX	2	/*
	3	* Create default crypto algorithm instances.
	4	*
	5	* Copyright (c) 2006 Herbert Xu <[email protected]>
2b8c19db HX	6	*/
2b8c19db HX	7
6fe4a28d	8	#include <crypto/internal/aead.h>
39871037	9	#include <linux/completion.h>
2b8c19db HX	10	#include <linux/ctype.h>
	11	#include <linux/err.h>
	12	#include <linux/init.h>
cf02f5da	13	#include <linux/kthread.h>
2b8c19db HX	14	#include <linux/module.h>
	15	#include <linux/notifier.h>
	16	#include <linux/rtnetlink.h>
174cd4b1	17	#include <linux/sched/signal.h>
5a0e3ad6	18	#include <linux/slab.h>
2b8c19db	19	#include <linux/string.h>
2b8c19db HX	20
	21	#include "internal.h"
	22
	23	struct cryptomgr_param {
39e1ee01	24	struct rtattr *tb[CRYPTO_MAX_ATTRS + 2];
ebc610e5 HX	25
	26	struct {
	27	struct rtattr attr;
	28	struct crypto_attr_type data;
	29	} type;
	30
39e1ee01	31	union {
2b8c19db	32	struct rtattr attr;
39e1ee01 HX	33	struct {
	34	struct rtattr attr;
	35	struct crypto_attr_alg data;
	36	} alg;
	37	struct {
	38	struct rtattr attr;
	39	struct crypto_attr_u32 data;
	40	} nu32;
	41	} attrs[CRYPTO_MAX_ATTRS];
	42
2b8c19db	43	char template[CRYPTO_MAX_ALG_NAME];
73d3864a	44
939e1779	45	struct crypto_larval *larval;
39871037	46
73d3864a HX	47	u32 otype;
	48	u32 omask;
	49	};
	50
	51	struct crypto_test_param {
	52	char driver[CRYPTO_MAX_ALG_NAME];
	53	char alg[CRYPTO_MAX_ALG_NAME];
	54	u32 type;
2b8c19db HX	55	};
2b8c19db HX	56
cf02f5da	57	static int cryptomgr_probe(void *data)
2b8c19db	58	{
cf02f5da	59	struct cryptomgr_param *param = data;
2b8c19db	60	struct crypto_template *tmpl;
6bfd4809	61	int err;
2b8c19db HX	62
	63	tmpl = crypto_lookup_template(param->template);
	64	if (!tmpl)
39871037	65	goto out;
2b8c19db	66
6bfd4809	67	do {
a24a1fd7	68	err = tmpl->create(tmpl, param->tb);
6bfd4809	69	} while (err == -EAGAIN && !signal_pending(current));
2b8c19db HX	70
	71	crypto_tmpl_put(tmpl);
	72
	73	out:
939e1779 HX	74	complete_all(&param->larval->completion);
939e1779 HX	75	crypto_alg_put(&param->larval->alg);
2b8c19db	76	kfree(param);
cf02f5da	77	module_put_and_exit(0);
2b8c19db HX	78	}
	79
	80	static int cryptomgr_schedule_probe(struct crypto_larval *larval)
	81	{
1605b847	82	struct task_struct *thread;
2b8c19db HX	83	struct cryptomgr_param *param;
	84	const char *name = larval->alg.cra_name;
	85	const char *p;
	86	unsigned int len;
39e1ee01	87	int i;
2b8c19db	88
cf02f5da HX	89	if (!try_module_get(THIS_MODULE))
	90	goto err;
	91
ebc610e5	92	param = kzalloc(sizeof(*param), GFP_KERNEL);
2b8c19db	93	if (!param)
cf02f5da	94	goto err_put_module;
2b8c19db HX	95
	96	for (p = name; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	97	;
	98
	99	len = p - name;
	100	if (!len \|\| *p != '(')
	101	goto err_free_param;
	102
	103	memcpy(param->template, name, len);
2b8c19db	104
39e1ee01 HX	105	i = 0;
	106	for (;;) {
	107	int notnum = 0;
2b8c19db	108
39e1ee01	109	name = ++p;
39e1ee01 HX	110
	111	for (; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	112	notnum \|= !isdigit(*p);
	113
	114	if (*p == '(') {
	115	int recursion = 0;
	116
	117	for (;;) {
	118	if (!*++p)
	119	goto err_free_param;
	120	if (*p == '(')
	121	recursion++;
	122	else if (*p == ')' && !recursion--)
	123	break;
	124	}
	125
	126	notnum = 1;
720a650f	127	p++;
39e1ee01	128	}
cf02f5da HX	129
cf02f5da HX	130	len = p - name;
39e1ee01 HX	131	if (!len)
	132	goto err_free_param;
	133
	134	if (notnum) {
	135	param->attrs[i].alg.attr.rta_len =
	136	sizeof(param->attrs[i].alg);
	137	param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
	138	memcpy(param->attrs[i].alg.data.name, name, len);
	139	} else {
	140	param->attrs[i].nu32.attr.rta_len =
	141	sizeof(param->attrs[i].nu32);
	142	param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
	143	param->attrs[i].nu32.data.num =
	144	simple_strtol(name, NULL, 0);
	145	}
	146
	147	param->tb[i + 1] = &param->attrs[i].attr;
	148	i++;
	149
720a650f	150	if (i >= CRYPTO_MAX_ATTRS)
39e1ee01 HX	151	goto err_free_param;
	152
	153	if (*p == ')')
	154	break;
	155
	156	if (*p != ',')
	157	goto err_free_param;
cf02f5da HX	158	}
cf02f5da HX	159
39e1ee01	160	if (!i)
2b8c19db HX	161	goto err_free_param;
2b8c19db HX	162
39e1ee01 HX	163	param->tb[i + 1] = NULL;
39e1ee01 HX	164
ebc610e5 HX	165	param->type.attr.rta_len = sizeof(param->type);
ebc610e5 HX	166	param->type.attr.rta_type = CRYPTOA_TYPE;
73d3864a HX	167	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
73d3864a HX	168	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
39e1ee01	169	param->tb[0] = &param->type.attr;
2b8c19db	170
73d3864a HX	171	param->otype = larval->alg.cra_flags;
	172	param->omask = larval->mask;
	173
939e1779 HX	174	crypto_alg_get(&larval->alg);
939e1779 HX	175	param->larval = larval;
39871037	176
73d3864a HX	177	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
73d3864a HX	178	if (IS_ERR(thread))
939e1779	179	goto err_put_larval;
73d3864a HX	180
	181	return NOTIFY_STOP;
	182
939e1779 HX	183	err_put_larval:
939e1779 HX	184	crypto_alg_put(&larval->alg);
73d3864a HX	185	err_free_param:
	186	kfree(param);
	187	err_put_module:
	188	module_put(THIS_MODULE);
	189	err:
	190	return NOTIFY_OK;
	191	}
	192
	193	static int cryptomgr_test(void *data)
	194	{
	195	struct crypto_test_param *param = data;
	196	u32 type = param->type;
	197	int err = 0;
	198
326a6346 HX	199	#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
	200	goto skiptest;
	201	#endif
	202
6fe4a28d	203	if (type & CRYPTO_ALG_TESTED)
73d3864a HX	204	goto skiptest;
73d3864a HX	205
1aa4ecd9	206	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
73d3864a HX	207
	208	skiptest:
	209	crypto_alg_tested(param->driver, err);
	210
	211	kfree(param);
	212	module_put_and_exit(0);
	213	}
	214
	215	static int cryptomgr_schedule_test(struct crypto_alg *alg)
	216	{
	217	struct task_struct *thread;
	218	struct crypto_test_param *param;
6fe4a28d	219	u32 type;
73d3864a HX	220
	221	if (!try_module_get(THIS_MODULE))
	222	goto err;
	223
	224	param = kzalloc(sizeof(*param), GFP_KERNEL);
	225	if (!param)
	226	goto err_put_module;
	227
	228	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
	229	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
6fe4a28d HX	230	type = alg->cra_flags;
6fe4a28d HX	231
eed93e0c HX	232	/* Do not test internal algorithms. */
eed93e0c HX	233	if (type & CRYPTO_ALG_INTERNAL)
6fe4a28d HX	234	type \|= CRYPTO_ALG_TESTED;
	235
	236	param->type = type;
73d3864a HX	237
73d3864a HX	238	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
1605b847	239	if (IS_ERR(thread))
cf02f5da	240	goto err_free_param;
2b8c19db HX	241
	242	return NOTIFY_STOP;
	243
	244	err_free_param:
	245	kfree(param);
cf02f5da HX	246	err_put_module:
cf02f5da HX	247	module_put(THIS_MODULE);
2b8c19db HX	248	err:
	249	return NOTIFY_OK;
	250	}
	251
	252	static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
	253	void *data)
	254	{
	255	switch (msg) {
	256	case CRYPTO_MSG_ALG_REQUEST:
	257	return cryptomgr_schedule_probe(data);
73d3864a HX	258	case CRYPTO_MSG_ALG_REGISTER:
73d3864a HX	259	return cryptomgr_schedule_test(data);
dd8b083f MP	260	case CRYPTO_MSG_ALG_LOADED:
dd8b083f MP	261	break;
2b8c19db HX	262	}
	263
	264	return NOTIFY_DONE;
	265	}
	266
	267	static struct notifier_block cryptomgr_notifier = {
	268	.notifier_call = cryptomgr_notify,
	269	};
	270
	271	static int __init cryptomgr_init(void)
	272	{
f8b0d4d0	273	return crypto_register_notifier(&cryptomgr_notifier);
2b8c19db HX	274	}
	275
	276	static void __exit cryptomgr_exit(void)
	277	{
	278	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	279	BUG_ON(err);
	280	}
	281
c4741b23 EB	282	/*
	283	* This is arch_initcall() so that the crypto self-tests are run on algorithms
	284	* registered early by subsys_initcall(). subsys_initcall() is needed for
	285	* generic implementations so that they're available for comparison tests when
	286	* other implementations are registered later by module_init().
	287	*/
	288	arch_initcall(cryptomgr_init);
2b8c19db HX	289	module_exit(cryptomgr_exit);
	290
	291	MODULE_LICENSE("GPL");
	292	MODULE_DESCRIPTION("Crypto Algorithm Manager");