mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Herbert Xu](/assets/img/avatar_default.png)
By the time kthread_run returns the param may have already been freed so writing the returned thread_struct pointer to param is wrong. In fact, we don't need it in param anyway so this patch simply puts it on the stack. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
176 lines
3.6 KiB
C
176 lines
3.6 KiB
C
/*
|
|
* Create default crypto algorithm instances.
|
|
*
|
|
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/crypto.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.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
|
|
struct cryptomgr_param {
|
|
struct rtattr *tb[CRYPTOA_MAX];
|
|
|
|
struct {
|
|
struct rtattr attr;
|
|
struct crypto_attr_type data;
|
|
} type;
|
|
|
|
struct {
|
|
struct rtattr attr;
|
|
struct crypto_attr_alg data;
|
|
} alg;
|
|
|
|
struct {
|
|
char name[CRYPTO_MAX_ALG_NAME];
|
|
} larval;
|
|
|
|
char template[CRYPTO_MAX_ALG_NAME];
|
|
};
|
|
|
|
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 err;
|
|
|
|
do {
|
|
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);
|
|
|
|
if (err)
|
|
goto err;
|
|
|
|
out:
|
|
kfree(param);
|
|
module_put_and_exit(0);
|
|
|
|
err:
|
|
crypto_larval_error(param->larval.name, param->type.data.type,
|
|
param->type.data.mask);
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
name = p + 1;
|
|
len = 0;
|
|
for (p = name; *p; p++) {
|
|
for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++)
|
|
;
|
|
|
|
if (*p != ')')
|
|
goto err_free_param;
|
|
|
|
len = p - name;
|
|
}
|
|
|
|
if (!len || name[len + 1])
|
|
goto err_free_param;
|
|
|
|
param->type.attr.rta_len = sizeof(param->type);
|
|
param->type.attr.rta_type = CRYPTOA_TYPE;
|
|
param->type.data.type = larval->alg.cra_flags;
|
|
param->type.data.mask = larval->mask;
|
|
param->tb[CRYPTOA_TYPE - 1] = ¶m->type.attr;
|
|
|
|
param->alg.attr.rta_len = sizeof(param->alg);
|
|
param->alg.attr.rta_type = CRYPTOA_ALG;
|
|
memcpy(param->alg.data.name, name, len);
|
|
param->tb[CRYPTOA_ALG - 1] = ¶m->alg.attr;
|
|
|
|
memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
|
|
|
|
thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
module_init(cryptomgr_init);
|
|
module_exit(cryptomgr_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Crypto Algorithm Manager");
|