linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * linux/ipc/namespace.c

 * Copyright (C) 2006 Pavel Emelyanov <xemul@openvz.org> OpenVZ, SWsoft Inc.

 */

​

#include <linux/ipc.h>

#include <linux/msg.h>

#include <linux/ipc_namespace.h>

#include <linux/rcupdate.h>

#include <linux/nsproxy.h>

#include <linux/slab.h>

#include <linux/cred.h>

#include <linux/fs.h>

#include <linux/mount.h>

#include <linux/user_namespace.h>

#include <linux/proc_ns.h>

#include <linux/sched/task.h>

​

#include "util.h"

​

static struct ucounts *inc_ipc_namespaces(struct user_namespace *ns)

{

    return inc_ucount(ns, current_euid(), UCOUNT_IPC_NAMESPACES);

}

​

static void dec_ipc_namespaces(struct ucounts *ucounts)

{

    dec_ucount(ucounts, UCOUNT_IPC_NAMESPACES);

}

​

static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,

                       struct ipc_namespace *old_ns)

{

    struct ipc_namespace *ns;

    struct ucounts *ucounts;

    int err;

​

    err = -ENOSPC;

    ucounts = inc_ipc_namespaces(user_ns);

    if (!ucounts)

        goto fail;

​

    err = -ENOMEM;

    ns = kzalloc(sizeof(struct ipc_namespace), GFP_KERNEL);

    if (ns == NULL)

        goto fail_dec;

​

    err = ns_alloc_inum(&ns->ns);

    if (err)

        goto fail_free;

    ns->ns.ops = &ipcns_operations;

​

    refcount_set(&ns->count, 1);

    ns->user_ns = get_user_ns(user_ns);

    ns->ucounts = ucounts;

​

    err = mq_init_ns(ns);

    if (err)

        goto fail_put;

​

    sem_init_ns(ns);

    msg_init_ns(ns);