2 * Copyright (C) 2006 IBM Corporation
4 * Author: Serge Hallyn <serue@us.ibm.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
11 * Jun 2006 - namespaces support
13 * Pavel Emelianov <xemul@openvz.org>
16 #include <linux/module.h>
17 #include <linux/version.h>
18 #include <linux/nsproxy.h>
19 #include <linux/init_task.h>
20 #include <linux/mnt_namespace.h>
21 #include <linux/utsname.h>
22 #include <linux/pid_namespace.h>
24 struct nsproxy init_nsproxy
= INIT_NSPROXY(init_nsproxy
);
26 static inline void get_nsproxy(struct nsproxy
*ns
)
28 atomic_inc(&ns
->count
);
31 void get_task_namespaces(struct task_struct
*tsk
)
33 struct nsproxy
*ns
= tsk
->nsproxy
;
40 * creates a copy of "orig" with refcount 1.
42 static inline struct nsproxy
*clone_nsproxy(struct nsproxy
*orig
)
46 ns
= kmemdup(orig
, sizeof(struct nsproxy
), GFP_KERNEL
);
48 atomic_set(&ns
->count
, 1);
53 * Create new nsproxy and all of its the associated namespaces.
54 * Return the newly created nsproxy. Do not attach this to the task,
55 * leave it to the caller to do proper locking and attach it to task.
57 static struct nsproxy
*create_new_namespaces(int flags
, struct task_struct
*tsk
,
58 struct fs_struct
*new_fs
)
60 struct nsproxy
*new_nsp
;
63 new_nsp
= clone_nsproxy(tsk
->nsproxy
);
65 return ERR_PTR(-ENOMEM
);
67 new_nsp
->mnt_ns
= copy_mnt_ns(flags
, tsk
->nsproxy
->mnt_ns
, new_fs
);
68 if (IS_ERR(new_nsp
->mnt_ns
)) {
69 err
= PTR_ERR(new_nsp
->mnt_ns
);
73 new_nsp
->uts_ns
= copy_utsname(flags
, tsk
->nsproxy
->uts_ns
);
74 if (IS_ERR(new_nsp
->uts_ns
)) {
75 err
= PTR_ERR(new_nsp
->uts_ns
);
79 new_nsp
->ipc_ns
= copy_ipcs(flags
, tsk
->nsproxy
->ipc_ns
);
80 if (IS_ERR(new_nsp
->ipc_ns
)) {
81 err
= PTR_ERR(new_nsp
->ipc_ns
);
85 new_nsp
->pid_ns
= copy_pid_ns(flags
, tsk
->nsproxy
->pid_ns
);
86 if (IS_ERR(new_nsp
->pid_ns
)) {
87 err
= PTR_ERR(new_nsp
->pid_ns
);
91 new_nsp
->user_ns
= copy_user_ns(flags
, tsk
->nsproxy
->user_ns
);
92 if (IS_ERR(new_nsp
->user_ns
)) {
93 err
= PTR_ERR(new_nsp
->user_ns
);
101 put_pid_ns(new_nsp
->pid_ns
);
104 put_ipc_ns(new_nsp
->ipc_ns
);
107 put_uts_ns(new_nsp
->uts_ns
);
110 put_mnt_ns(new_nsp
->mnt_ns
);
117 * called from clone. This now handles copy for nsproxy and all
118 * namespaces therein.
120 int copy_namespaces(int flags
, struct task_struct
*tsk
)
122 struct nsproxy
*old_ns
= tsk
->nsproxy
;
123 struct nsproxy
*new_ns
;
131 if (!(flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
| CLONE_NEWUSER
)))
134 if (!capable(CAP_SYS_ADMIN
)) {
139 new_ns
= create_new_namespaces(flags
, tsk
, tsk
->fs
);
140 if (IS_ERR(new_ns
)) {
141 err
= PTR_ERR(new_ns
);
145 tsk
->nsproxy
= new_ns
;
151 void free_nsproxy(struct nsproxy
*ns
)
154 put_mnt_ns(ns
->mnt_ns
);
156 put_uts_ns(ns
->uts_ns
);
158 put_ipc_ns(ns
->ipc_ns
);
160 put_pid_ns(ns
->pid_ns
);
162 put_user_ns(ns
->user_ns
);
167 * Called from unshare. Unshare all the namespaces part of nsproxy.
168 * On success, returns the new nsproxy.
170 int unshare_nsproxy_namespaces(unsigned long unshare_flags
,
171 struct nsproxy
**new_nsp
, struct fs_struct
*new_fs
)
175 if (!(unshare_flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
|
179 if (!capable(CAP_SYS_ADMIN
))
182 *new_nsp
= create_new_namespaces(unshare_flags
, current
,
183 new_fs
? new_fs
: current
->fs
);
184 if (IS_ERR(*new_nsp
))
185 err
= PTR_ERR(*new_nsp
);
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