[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;
	struct crypto_instance *inst;
	int err;

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

	do {
		if (tmpl->create) {
			err = tmpl->create(tmpl, param->tb);
			continue;
		}

		inst = tmpl->alloc(param->tb);
		if (IS_ERR(inst))
			err = PTR_ERR(inst);
		else if ((err = crypto_register_instance(tmpl, inst)))
			tmpl->free(inst);
	} 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;

	wait_for_completion_interruptible(&larval->completion);

	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 HX	60	struct crypto_template *tmpl;
2b8c19db HX	61	struct crypto_instance *inst;
6bfd4809	62	int err;
2b8c19db HX	63
	64	tmpl = crypto_lookup_template(param->template);
	65	if (!tmpl)
39871037	66	goto out;
2b8c19db	67
6bfd4809	68	do {
f2ac72e8 HX	69	if (tmpl->create) {
	70	err = tmpl->create(tmpl, param->tb);
	71	continue;
	72	}
	73
ebc610e5	74	inst = tmpl->alloc(param->tb);
6bfd4809 HX	75	if (IS_ERR(inst))
	76	err = PTR_ERR(inst);
	77	else if ((err = crypto_register_instance(tmpl, inst)))
	78	tmpl->free(inst);
	79	} while (err == -EAGAIN && !signal_pending(current));
2b8c19db HX	80
	81	crypto_tmpl_put(tmpl);
	82
	83	out:
939e1779 HX	84	complete_all(&param->larval->completion);
939e1779 HX	85	crypto_alg_put(&param->larval->alg);
2b8c19db	86	kfree(param);
cf02f5da	87	module_put_and_exit(0);
2b8c19db HX	88	}
	89
	90	static int cryptomgr_schedule_probe(struct crypto_larval *larval)
	91	{
1605b847	92	struct task_struct *thread;
2b8c19db HX	93	struct cryptomgr_param *param;
	94	const char *name = larval->alg.cra_name;
	95	const char *p;
	96	unsigned int len;
39e1ee01	97	int i;
2b8c19db	98
cf02f5da HX	99	if (!try_module_get(THIS_MODULE))
	100	goto err;
	101
ebc610e5	102	param = kzalloc(sizeof(*param), GFP_KERNEL);
2b8c19db	103	if (!param)
cf02f5da	104	goto err_put_module;
2b8c19db HX	105
	106	for (p = name; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	107	;
	108
	109	len = p - name;
	110	if (!len \|\| *p != '(')
	111	goto err_free_param;
	112
	113	memcpy(param->template, name, len);
2b8c19db	114
39e1ee01 HX	115	i = 0;
	116	for (;;) {
	117	int notnum = 0;
2b8c19db	118
39e1ee01	119	name = ++p;
39e1ee01 HX	120
	121	for (; isalnum(p) \|\| p == '-' \|\| *p == '_'; p++)
	122	notnum \|= !isdigit(*p);
	123
	124	if (*p == '(') {
	125	int recursion = 0;
	126
	127	for (;;) {
	128	if (!*++p)
	129	goto err_free_param;
	130	if (*p == '(')
	131	recursion++;
	132	else if (*p == ')' && !recursion--)
	133	break;
	134	}
	135
	136	notnum = 1;
720a650f	137	p++;
39e1ee01	138	}
cf02f5da HX	139
cf02f5da HX	140	len = p - name;
39e1ee01 HX	141	if (!len)
	142	goto err_free_param;
	143
	144	if (notnum) {
	145	param->attrs[i].alg.attr.rta_len =
	146	sizeof(param->attrs[i].alg);
	147	param->attrs[i].alg.attr.rta_type = CRYPTOA_ALG;
	148	memcpy(param->attrs[i].alg.data.name, name, len);
	149	} else {
	150	param->attrs[i].nu32.attr.rta_len =
	151	sizeof(param->attrs[i].nu32);
	152	param->attrs[i].nu32.attr.rta_type = CRYPTOA_U32;
	153	param->attrs[i].nu32.data.num =
	154	simple_strtol(name, NULL, 0);
	155	}
	156
	157	param->tb[i + 1] = &param->attrs[i].attr;
	158	i++;
	159
720a650f	160	if (i >= CRYPTO_MAX_ATTRS)
39e1ee01 HX	161	goto err_free_param;
	162
	163	if (*p == ')')
	164	break;
	165
	166	if (*p != ',')
	167	goto err_free_param;
cf02f5da HX	168	}
cf02f5da HX	169
39e1ee01	170	if (!i)
2b8c19db HX	171	goto err_free_param;
2b8c19db HX	172
39e1ee01 HX	173	param->tb[i + 1] = NULL;
39e1ee01 HX	174
ebc610e5 HX	175	param->type.attr.rta_len = sizeof(param->type);
ebc610e5 HX	176	param->type.attr.rta_type = CRYPTOA_TYPE;
73d3864a HX	177	param->type.data.type = larval->alg.cra_flags & ~CRYPTO_ALG_TESTED;
73d3864a HX	178	param->type.data.mask = larval->mask & ~CRYPTO_ALG_TESTED;
39e1ee01	179	param->tb[0] = &param->type.attr;
2b8c19db	180
73d3864a HX	181	param->otype = larval->alg.cra_flags;
	182	param->omask = larval->mask;
	183
939e1779 HX	184	crypto_alg_get(&larval->alg);
939e1779 HX	185	param->larval = larval;
39871037	186
73d3864a HX	187	thread = kthread_run(cryptomgr_probe, param, "cryptomgr_probe");
73d3864a HX	188	if (IS_ERR(thread))
939e1779	189	goto err_put_larval;
73d3864a	190
39871037 HX	191	wait_for_completion_interruptible(&larval->completion);
39871037 HX	192
73d3864a HX	193	return NOTIFY_STOP;
73d3864a HX	194
939e1779 HX	195	err_put_larval:
939e1779 HX	196	crypto_alg_put(&larval->alg);
73d3864a HX	197	err_free_param:
	198	kfree(param);
	199	err_put_module:
	200	module_put(THIS_MODULE);
	201	err:
	202	return NOTIFY_OK;
	203	}
	204
	205	static int cryptomgr_test(void *data)
	206	{
	207	struct crypto_test_param *param = data;
	208	u32 type = param->type;
	209	int err = 0;
	210
326a6346 HX	211	#ifdef CONFIG_CRYPTO_MANAGER_DISABLE_TESTS
	212	goto skiptest;
	213	#endif
	214
6fe4a28d	215	if (type & CRYPTO_ALG_TESTED)
73d3864a HX	216	goto skiptest;
73d3864a HX	217
1aa4ecd9	218	err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
73d3864a HX	219
	220	skiptest:
	221	crypto_alg_tested(param->driver, err);
	222
	223	kfree(param);
	224	module_put_and_exit(0);
	225	}
	226
	227	static int cryptomgr_schedule_test(struct crypto_alg *alg)
	228	{
	229	struct task_struct *thread;
	230	struct crypto_test_param *param;
6fe4a28d	231	u32 type;
73d3864a HX	232
	233	if (!try_module_get(THIS_MODULE))
	234	goto err;
	235
	236	param = kzalloc(sizeof(*param), GFP_KERNEL);
	237	if (!param)
	238	goto err_put_module;
	239
	240	memcpy(param->driver, alg->cra_driver_name, sizeof(param->driver));
	241	memcpy(param->alg, alg->cra_name, sizeof(param->alg));
6fe4a28d HX	242	type = alg->cra_flags;
6fe4a28d HX	243
eed93e0c HX	244	/* Do not test internal algorithms. */
eed93e0c HX	245	if (type & CRYPTO_ALG_INTERNAL)
6fe4a28d HX	246	type \|= CRYPTO_ALG_TESTED;
	247
	248	param->type = type;
73d3864a HX	249
73d3864a HX	250	thread = kthread_run(cryptomgr_test, param, "cryptomgr_test");
1605b847	251	if (IS_ERR(thread))
cf02f5da	252	goto err_free_param;
2b8c19db HX	253
	254	return NOTIFY_STOP;
	255
	256	err_free_param:
	257	kfree(param);
cf02f5da HX	258	err_put_module:
cf02f5da HX	259	module_put(THIS_MODULE);
2b8c19db HX	260	err:
	261	return NOTIFY_OK;
	262	}
	263
	264	static int cryptomgr_notify(struct notifier_block *this, unsigned long msg,
	265	void *data)
	266	{
	267	switch (msg) {
	268	case CRYPTO_MSG_ALG_REQUEST:
	269	return cryptomgr_schedule_probe(data);
73d3864a HX	270	case CRYPTO_MSG_ALG_REGISTER:
73d3864a HX	271	return cryptomgr_schedule_test(data);
dd8b083f MP	272	case CRYPTO_MSG_ALG_LOADED:
dd8b083f MP	273	break;
2b8c19db HX	274	}
	275
	276	return NOTIFY_DONE;
	277	}
	278
	279	static struct notifier_block cryptomgr_notifier = {
	280	.notifier_call = cryptomgr_notify,
	281	};
	282
	283	static int __init cryptomgr_init(void)
	284	{
f8b0d4d0	285	return crypto_register_notifier(&cryptomgr_notifier);
2b8c19db HX	286	}
	287
	288	static void __exit cryptomgr_exit(void)
	289	{
	290	int err = crypto_unregister_notifier(&cryptomgr_notifier);
	291	BUG_ON(err);
	292	}
	293
c4741b23 EB	294	/*
	295	* This is arch_initcall() so that the crypto self-tests are run on algorithms
	296	* registered early by subsys_initcall(). subsys_initcall() is needed for
	297	* generic implementations so that they're available for comparison tests when
	298	* other implementations are registered later by module_init().
	299	*/
	300	arch_initcall(cryptomgr_init);
2b8c19db HX	301	module_exit(cryptomgr_exit);
	302
	303	MODULE_LICENSE("GPL");
	304	MODULE_DESCRIPTION("Crypto Algorithm Manager");