2006-10-02 09:18:06 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2006 IBM Corporation
|
|
|
|
*
|
|
|
|
* Author: Serge Hallyn <serue@us.ibm.com>
|
|
|
|
*
|
|
|
|
* 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, version 2 of the
|
|
|
|
* License.
|
2006-10-02 09:18:19 +00:00
|
|
|
*
|
|
|
|
* Jun 2006 - namespaces support
|
|
|
|
* OpenVZ, SWsoft Inc.
|
|
|
|
* Pavel Emelianov <xemul@openvz.org>
|
2006-10-02 09:18:06 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/nsproxy.h>
|
2006-10-02 09:18:07 +00:00
|
|
|
#include <linux/init_task.h>
|
2006-12-08 10:37:56 +00:00
|
|
|
#include <linux/mnt_namespace.h>
|
2006-10-02 09:18:14 +00:00
|
|
|
#include <linux/utsname.h>
|
2006-12-08 10:37:59 +00:00
|
|
|
#include <linux/pid_namespace.h>
|
2007-09-27 05:04:26 +00:00
|
|
|
#include <net/net_namespace.h>
|
2008-02-08 12:18:22 +00:00
|
|
|
#include <linux/ipc_namespace.h>
|
2006-10-02 09:18:07 +00:00
|
|
|
|
2007-07-16 06:41:07 +00:00
|
|
|
static struct kmem_cache *nsproxy_cachep;
|
|
|
|
|
2010-03-10 23:23:10 +00:00
|
|
|
struct nsproxy init_nsproxy = {
|
|
|
|
.count = ATOMIC_INIT(1),
|
|
|
|
.uts_ns = &init_uts_ns,
|
|
|
|
#if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
|
|
|
|
.ipc_ns = &init_ipc_ns,
|
|
|
|
#endif
|
|
|
|
.mnt_ns = NULL,
|
|
|
|
.pid_ns = &init_pid_ns,
|
|
|
|
#ifdef CONFIG_NET
|
|
|
|
.net_ns = &init_net,
|
|
|
|
#endif
|
|
|
|
};
|
2006-10-02 09:18:06 +00:00
|
|
|
|
2009-06-17 23:27:56 +00:00
|
|
|
static inline struct nsproxy *create_nsproxy(void)
|
2006-10-02 09:18:06 +00:00
|
|
|
{
|
2009-06-17 23:27:56 +00:00
|
|
|
struct nsproxy *nsproxy;
|
2006-10-02 09:18:06 +00:00
|
|
|
|
2009-06-17 23:27:56 +00:00
|
|
|
nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
|
|
|
|
if (nsproxy)
|
|
|
|
atomic_set(&nsproxy->count, 1);
|
|
|
|
return nsproxy;
|
2006-10-02 09:18:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-05-08 07:25:21 +00:00
|
|
|
* Create new nsproxy and all of its the associated namespaces.
|
|
|
|
* Return the newly created nsproxy. Do not attach this to the task,
|
|
|
|
* leave it to the caller to do proper locking and attach it to task.
|
2006-10-02 09:18:06 +00:00
|
|
|
*/
|
2007-07-16 06:41:15 +00:00
|
|
|
static struct nsproxy *create_new_namespaces(unsigned long flags,
|
|
|
|
struct task_struct *tsk, struct fs_struct *new_fs)
|
2006-10-02 09:18:06 +00:00
|
|
|
{
|
2007-05-08 07:25:21 +00:00
|
|
|
struct nsproxy *new_nsp;
|
2007-07-16 06:41:06 +00:00
|
|
|
int err;
|
2006-10-02 09:18:06 +00:00
|
|
|
|
2009-06-17 23:27:56 +00:00
|
|
|
new_nsp = create_nsproxy();
|
2007-05-08 07:25:21 +00:00
|
|
|
if (!new_nsp)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
2006-10-02 09:18:08 +00:00
|
|
|
|
2007-05-08 07:25:21 +00:00
|
|
|
new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs);
|
2007-07-16 06:41:06 +00:00
|
|
|
if (IS_ERR(new_nsp->mnt_ns)) {
|
|
|
|
err = PTR_ERR(new_nsp->mnt_ns);
|
2007-05-08 07:25:21 +00:00
|
|
|
goto out_ns;
|
2007-07-16 06:41:06 +00:00
|
|
|
}
|
2007-05-08 07:25:21 +00:00
|
|
|
|
|
|
|
new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns);
|
2007-07-16 06:41:06 +00:00
|
|
|
if (IS_ERR(new_nsp->uts_ns)) {
|
|
|
|
err = PTR_ERR(new_nsp->uts_ns);
|
2007-05-08 07:25:21 +00:00
|
|
|
goto out_uts;
|
2007-07-16 06:41:06 +00:00
|
|
|
}
|
2007-05-08 07:25:21 +00:00
|
|
|
|
|
|
|
new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
|
2007-07-16 06:41:06 +00:00
|
|
|
if (IS_ERR(new_nsp->ipc_ns)) {
|
|
|
|
err = PTR_ERR(new_nsp->ipc_ns);
|
2007-05-08 07:25:21 +00:00
|
|
|
goto out_ipc;
|
2007-07-16 06:41:06 +00:00
|
|
|
}
|
2007-05-08 07:25:21 +00:00
|
|
|
|
2007-10-19 06:39:49 +00:00
|
|
|
new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk));
|
2007-07-16 06:41:06 +00:00
|
|
|
if (IS_ERR(new_nsp->pid_ns)) {
|
|
|
|
err = PTR_ERR(new_nsp->pid_ns);
|
2007-05-08 07:25:21 +00:00
|
|
|
goto out_pid;
|
2007-07-16 06:41:06 +00:00
|
|
|
}
|
2007-05-08 07:25:21 +00:00
|
|
|
|
2007-09-27 05:04:26 +00:00
|
|
|
new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
|
|
|
|
if (IS_ERR(new_nsp->net_ns)) {
|
|
|
|
err = PTR_ERR(new_nsp->net_ns);
|
|
|
|
goto out_net;
|
|
|
|
}
|
|
|
|
|
2007-05-08 07:25:21 +00:00
|
|
|
return new_nsp;
|
|
|
|
|
2007-09-27 05:04:26 +00:00
|
|
|
out_net:
|
2007-07-16 06:40:59 +00:00
|
|
|
if (new_nsp->pid_ns)
|
|
|
|
put_pid_ns(new_nsp->pid_ns);
|
2007-05-08 07:25:21 +00:00
|
|
|
out_pid:
|
|
|
|
if (new_nsp->ipc_ns)
|
|
|
|
put_ipc_ns(new_nsp->ipc_ns);
|
|
|
|
out_ipc:
|
|
|
|
if (new_nsp->uts_ns)
|
|
|
|
put_uts_ns(new_nsp->uts_ns);
|
|
|
|
out_uts:
|
|
|
|
if (new_nsp->mnt_ns)
|
|
|
|
put_mnt_ns(new_nsp->mnt_ns);
|
|
|
|
out_ns:
|
2007-07-16 06:41:07 +00:00
|
|
|
kmem_cache_free(nsproxy_cachep, new_nsp);
|
2007-07-16 06:41:06 +00:00
|
|
|
return ERR_PTR(err);
|
2006-10-02 09:18:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* called from clone. This now handles copy for nsproxy and all
|
|
|
|
* namespaces therein.
|
|
|
|
*/
|
2007-07-16 06:41:15 +00:00
|
|
|
int copy_namespaces(unsigned long flags, struct task_struct *tsk)
|
2006-10-02 09:18:06 +00:00
|
|
|
{
|
|
|
|
struct nsproxy *old_ns = tsk->nsproxy;
|
2006-10-02 09:18:08 +00:00
|
|
|
struct nsproxy *new_ns;
|
|
|
|
int err = 0;
|
2006-10-02 09:18:06 +00:00
|
|
|
|
|
|
|
if (!old_ns)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
get_nsproxy(old_ns);
|
|
|
|
|
2007-10-19 06:40:10 +00:00
|
|
|
if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
|
2008-10-15 21:38:45 +00:00
|
|
|
CLONE_NEWPID | CLONE_NEWNET)))
|
2006-10-02 09:18:08 +00:00
|
|
|
return 0;
|
|
|
|
|
2007-05-08 07:25:21 +00:00
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
|
|
err = -EPERM;
|
2006-10-02 09:18:08 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2008-04-29 08:01:00 +00:00
|
|
|
/*
|
|
|
|
* CLONE_NEWIPC must detach from the undolist: after switching
|
|
|
|
* to a new ipc namespace, the semaphore arrays from the old
|
|
|
|
* namespace are unreachable. In clone parlance, CLONE_SYSVSEM
|
|
|
|
* means share undolist with parent, so we must forbid using
|
|
|
|
* it along with CLONE_NEWIPC.
|
|
|
|
*/
|
|
|
|
if ((flags & CLONE_NEWIPC) && (flags & CLONE_SYSVSEM)) {
|
|
|
|
err = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2007-05-08 07:25:21 +00:00
|
|
|
new_ns = create_new_namespaces(flags, tsk, tsk->fs);
|
|
|
|
if (IS_ERR(new_ns)) {
|
|
|
|
err = PTR_ERR(new_ns);
|
|
|
|
goto out;
|
|
|
|
}
|
2006-12-08 10:37:59 +00:00
|
|
|
|
2007-05-08 07:25:21 +00:00
|
|
|
tsk->nsproxy = new_ns;
|
2007-10-19 06:39:45 +00:00
|
|
|
|
2006-10-02 09:18:08 +00:00
|
|
|
out:
|
2007-01-30 21:35:18 +00:00
|
|
|
put_nsproxy(old_ns);
|
2006-10-02 09:18:08 +00:00
|
|
|
return err;
|
2006-10-02 09:18:06 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void free_nsproxy(struct nsproxy *ns)
|
|
|
|
{
|
2006-12-08 10:37:59 +00:00
|
|
|
if (ns->mnt_ns)
|
|
|
|
put_mnt_ns(ns->mnt_ns);
|
|
|
|
if (ns->uts_ns)
|
|
|
|
put_uts_ns(ns->uts_ns);
|
|
|
|
if (ns->ipc_ns)
|
|
|
|
put_ipc_ns(ns->ipc_ns);
|
|
|
|
if (ns->pid_ns)
|
|
|
|
put_pid_ns(ns->pid_ns);
|
2007-09-27 05:04:26 +00:00
|
|
|
put_net(ns->net_ns);
|
2007-07-16 06:41:07 +00:00
|
|
|
kmem_cache_free(nsproxy_cachep, ns);
|
2006-10-02 09:18:06 +00:00
|
|
|
}
|
2007-05-08 07:25:21 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Called from unshare. Unshare all the namespaces part of nsproxy.
|
2007-06-24 00:16:25 +00:00
|
|
|
* On success, returns the new nsproxy.
|
2007-05-08 07:25:21 +00:00
|
|
|
*/
|
|
|
|
int unshare_nsproxy_namespaces(unsigned long unshare_flags,
|
|
|
|
struct nsproxy **new_nsp, struct fs_struct *new_fs)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
|
2007-07-16 06:41:01 +00:00
|
|
|
if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
|
2008-10-15 21:38:45 +00:00
|
|
|
CLONE_NEWNET)))
|
2007-05-08 07:25:21 +00:00
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
*new_nsp = create_new_namespaces(unshare_flags, current,
|
|
|
|
new_fs ? new_fs : current->fs);
|
2007-10-19 06:39:45 +00:00
|
|
|
if (IS_ERR(*new_nsp)) {
|
2007-05-08 07:25:21 +00:00
|
|
|
err = PTR_ERR(*new_nsp);
|
2007-10-19 06:39:45 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
2008-07-25 08:47:06 +00:00
|
|
|
err = ns_cgroup_clone(current, task_pid(current));
|
2007-10-19 06:39:45 +00:00
|
|
|
if (err)
|
|
|
|
put_nsproxy(*new_nsp);
|
|
|
|
|
|
|
|
out:
|
2007-05-08 07:25:21 +00:00
|
|
|
return err;
|
|
|
|
}
|
2007-07-16 06:41:07 +00:00
|
|
|
|
2007-10-19 06:39:54 +00:00
|
|
|
void switch_task_namespaces(struct task_struct *p, struct nsproxy *new)
|
|
|
|
{
|
|
|
|
struct nsproxy *ns;
|
|
|
|
|
|
|
|
might_sleep();
|
|
|
|
|
|
|
|
ns = p->nsproxy;
|
|
|
|
|
|
|
|
rcu_assign_pointer(p->nsproxy, new);
|
|
|
|
|
|
|
|
if (ns && atomic_dec_and_test(&ns->count)) {
|
|
|
|
/*
|
|
|
|
* wait for others to get what they want from this nsproxy.
|
|
|
|
*
|
|
|
|
* cannot release this nsproxy via the call_rcu() since
|
|
|
|
* put_mnt_ns() will want to sleep
|
|
|
|
*/
|
|
|
|
synchronize_rcu();
|
|
|
|
free_nsproxy(ns);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void exit_task_namespaces(struct task_struct *p)
|
|
|
|
{
|
|
|
|
switch_task_namespaces(p, NULL);
|
|
|
|
}
|
|
|
|
|
2007-07-16 06:41:07 +00:00
|
|
|
static int __init nsproxy_cache_init(void)
|
|
|
|
{
|
2007-10-17 06:30:11 +00:00
|
|
|
nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC);
|
2007-07-16 06:41:07 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nsproxy_cache_init);
|