https://github.com/torvalds/linux
Tip revision: e8d018dd0257f744ca50a729e3d042cf2ec9da65 authored by Linus Torvalds on 19 March 2023, 20:27:55 UTC
Linux 6.3-rc3
Linux 6.3-rc3
Tip revision: e8d018d
algboss.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Create default crypto algorithm instances.
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*/
#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;
struct {
struct rtattr attr;
struct crypto_attr_alg data;
} 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(¶m->larval->completion);
crypto_alg_put(¶m->larval->alg);
kfree(param);
module_put_and_kthread_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 (;;) {
name = ++p;
for (; isalnum(*p) || *p == '-' || *p == '_'; p++)
;
if (*p == '(') {
int recursion = 0;
for (;;) {
if (!*++p)
goto err_free_param;
if (*p == '(')
recursion++;
else if (*p == ')' && !recursion--)
break;
}
p++;
}
len = p - name;
if (!len)
goto err_free_param;
param->attrs[i].attr.rta_len = sizeof(param->attrs[i]);
param->attrs[i].attr.rta_type = CRYPTOA_ALG;
memcpy(param->attrs[i].data.name, name, len);
param->tb[i + 1] = ¶m->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] = ¶m->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;
err = alg_test(param->driver, param->alg, type, CRYPTO_ALG_TESTED);
crypto_alg_tested(param->driver, err);
kfree(param);
module_put_and_kthread_exit(0);
}
static int cryptomgr_schedule_test(struct crypto_alg *alg)
{
struct task_struct *thread;
struct crypto_test_param *param;
if (IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS))
return NOTIFY_DONE;
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));
param->type = alg->cra_flags;
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");