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/*
* New driver for /dev/crypto device (aka CryptoDev)
* Copyright (c) 2010 Nikos Mavrogiannopoulos <nmav@gnutls.org>
*
* This file is part of linux cryptodev.
*
* cryptodev 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 3 of the License, or
* (at your option) any later version.
*
* cryptodev is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/cryptodev.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/ncr.h>
#include <linux/highmem.h>
#include <linux/random.h>
#include <asm/atomic.h>
#include <linux/version.h>
#include <linux/file.h>
#include <linux/cred.h>
#include "ncr_int.h"
/* arbitrary now */
static unsigned int max_per_user[] = {
[LIMIT_TYPE_KEY] = 128,
[LIMIT_TYPE_DATA] = 128,
};
static unsigned int max_per_process[] = {
[LIMIT_TYPE_KEY] = 64,
[LIMIT_TYPE_DATA] = 64,
};
struct limit_user_item_st {
struct list_head list;
uid_t uid;
limits_type_t type;
atomic_t cnt;
};
struct limit_process_item_st {
struct list_head list;
pid_t pid;
limits_type_t type;
atomic_t cnt;
};
struct limit_st {
struct list_sem_st users;
struct list_sem_st processes;
};
static struct limit_st limits;
void ncr_limits_init(void)
{
init_MUTEX(&limits.users.sem);
INIT_LIST_HEAD(&limits.users.list);
init_MUTEX(&limits.processes.sem);
INIT_LIST_HEAD(&limits.processes.list);
}
void ncr_limits_deinit(void)
{
struct limit_process_item_st* pitem, *ptmp;
struct limit_user_item_st* uitem, *utmp;
down(&limits.users.sem);
list_for_each_entry_safe(uitem, utmp, &limits.users.list, list) {
list_del(&uitem->list);
kfree(uitem);
}
up(&limits.users.sem);
down(&limits.processes.sem);
list_for_each_entry_safe(pitem, ptmp, &limits.processes.list, list) {
list_del(&pitem->list);
kfree(pitem);
}
up(&limits.processes.sem);
}
int ncr_limits_add_and_check(uid_t uid, pid_t pid, limits_type_t type)
{
struct limit_process_item_st* pitem;
struct limit_user_item_st* uitem;
int add = 1;
int ret;
down(&limits.users.sem);
list_for_each_entry(uitem, &limits.users.list, list) {
if (uitem->uid == uid && uitem->type == type) {
add = 0;
if (atomic_add_unless(&uitem->cnt, 1, max_per_user[type])==0) {
err();
up(&limits.users.sem);
return -EPERM;
}
}
}
if (add) {
uitem = kmalloc( sizeof(*uitem), GFP_KERNEL);
if (uitem == NULL) {
err();
up(&limits.users.sem);
return -ENOMEM;
}
uitem->uid = uid;
uitem->type = type;
atomic_set(&uitem->cnt, 1);
list_add(&uitem->list, &limits.users.list);
}
up(&limits.users.sem);
add = 1;
/* check process limits */
down(&limits.processes.sem);
list_for_each_entry(pitem, &limits.processes.list, list) {
if (pitem->pid == pid && pitem->type == type) {
add = 0;
if (atomic_add_unless(&pitem->cnt, 1, max_per_process[type])==0) {
err();
up(&limits.processes.sem);
ret = -EPERM;
goto restore_user;
}
}
}
if (add) {
pitem = kmalloc(sizeof(*pitem), GFP_KERNEL);
if (uitem == NULL) {
err();
up(&limits.processes.sem);
ret = -ENOMEM;
goto restore_user;
}
pitem->pid = pid;
pitem->type = type;
atomic_set(&pitem->cnt, 1);
list_add(&pitem->list, &limits.processes.list);
}
up(&limits.processes.sem);
return 0;
restore_user:
down(&limits.users.sem);
list_for_each_entry(uitem, &limits.users.list, list) {
if (uitem->uid == uid && uitem->type == type)
atomic_dec(&uitem->cnt);
}
up(&limits.users.sem);
return ret;
}
void ncr_limits_remove(uid_t uid, pid_t pid, limits_type_t type)
{
struct limit_process_item_st* pitem;
struct limit_user_item_st* uitem;
down(&limits.users.sem);
list_for_each_entry(uitem, &limits.users.list, list) {
if (uitem->uid == uid && uitem->type == type) {
atomic_dec(&uitem->cnt);
}
}
up(&limits.users.sem);
/* check process limits */
down(&limits.processes.sem);
list_for_each_entry(pitem, &limits.processes.list, list) {
if (pitem->pid == pid && pitem->type == type) {
atomic_dec(&pitem->cnt);
}
}
up(&limits.processes.sem);
return;
}
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