blob: ac99837e7a04c53304a46f72ac57f13d4e3a855d [file] [log] [blame]
Serge E. Hallynab516012006-10-02 02:18:06 -07001/*
2 * Copyright (C) 2006 IBM Corporation
3 *
4 * Author: Serge Hallyn <serue@us.ibm.com>
5 *
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
9 * License.
Kirill Korotaev25b21cb2006-10-02 02:18:19 -070010 *
11 * Jun 2006 - namespaces support
12 * OpenVZ, SWsoft Inc.
13 * Pavel Emelianov <xemul@openvz.org>
Serge E. Hallynab516012006-10-02 02:18:06 -070014 */
15
16#include <linux/module.h>
17#include <linux/version.h>
18#include <linux/nsproxy.h>
Serge E. Hallyn0437eb52006-10-02 02:18:07 -070019#include <linux/init_task.h>
Kirill Korotaev6b3286e2006-12-08 02:37:56 -080020#include <linux/mnt_namespace.h>
Serge E. Hallyn4865ecf2006-10-02 02:18:14 -070021#include <linux/utsname.h>
Cedric Le Goater9a575a92006-12-08 02:37:59 -080022#include <linux/pid_namespace.h>
Eric W. Biederman9dd776b2007-09-26 22:04:26 -070023#include <net/net_namespace.h>
Serge E. Hallyn0437eb52006-10-02 02:18:07 -070024
Cedric Le Goater98c0d072007-07-15 23:41:07 -070025static struct kmem_cache *nsproxy_cachep;
26
Serge E. Hallyn0437eb52006-10-02 02:18:07 -070027struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
Serge E. Hallynab516012006-10-02 02:18:06 -070028
29static inline void get_nsproxy(struct nsproxy *ns)
30{
31 atomic_inc(&ns->count);
32}
33
34void get_task_namespaces(struct task_struct *tsk)
35{
36 struct nsproxy *ns = tsk->nsproxy;
37 if (ns) {
38 get_nsproxy(ns);
39 }
40}
41
42/*
43 * creates a copy of "orig" with refcount 1.
Serge E. Hallynab516012006-10-02 02:18:06 -070044 */
Badari Pulavartye3222c42007-05-08 00:25:21 -070045static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
Serge E. Hallynab516012006-10-02 02:18:06 -070046{
47 struct nsproxy *ns;
48
Cedric Le Goater98c0d072007-07-15 23:41:07 -070049 ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
50 if (ns) {
51 memcpy(ns, orig, sizeof(struct nsproxy));
Serge E. Hallynab516012006-10-02 02:18:06 -070052 atomic_set(&ns->count, 1);
Cedric Le Goater98c0d072007-07-15 23:41:07 -070053 }
Serge E. Hallynab516012006-10-02 02:18:06 -070054 return ns;
55}
56
57/*
Badari Pulavartye3222c42007-05-08 00:25:21 -070058 * Create new nsproxy and all of its the associated namespaces.
59 * Return the newly created nsproxy. Do not attach this to the task,
60 * leave it to the caller to do proper locking and attach it to task.
Serge E. Hallynab516012006-10-02 02:18:06 -070061 */
Eric W. Biederman213dd262007-07-15 23:41:15 -070062static struct nsproxy *create_new_namespaces(unsigned long flags,
63 struct task_struct *tsk, struct fs_struct *new_fs)
Serge E. Hallynab516012006-10-02 02:18:06 -070064{
Badari Pulavartye3222c42007-05-08 00:25:21 -070065 struct nsproxy *new_nsp;
Cedric Le Goater467e9f42007-07-15 23:41:06 -070066 int err;
Serge E. Hallynab516012006-10-02 02:18:06 -070067
Badari Pulavartye3222c42007-05-08 00:25:21 -070068 new_nsp = clone_nsproxy(tsk->nsproxy);
69 if (!new_nsp)
70 return ERR_PTR(-ENOMEM);
Serge E. Hallyn1651e142006-10-02 02:18:08 -070071
Badari Pulavartye3222c42007-05-08 00:25:21 -070072 new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs);
Cedric Le Goater467e9f42007-07-15 23:41:06 -070073 if (IS_ERR(new_nsp->mnt_ns)) {
74 err = PTR_ERR(new_nsp->mnt_ns);
Badari Pulavartye3222c42007-05-08 00:25:21 -070075 goto out_ns;
Cedric Le Goater467e9f42007-07-15 23:41:06 -070076 }
Badari Pulavartye3222c42007-05-08 00:25:21 -070077
78 new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns);
Cedric Le Goater467e9f42007-07-15 23:41:06 -070079 if (IS_ERR(new_nsp->uts_ns)) {
80 err = PTR_ERR(new_nsp->uts_ns);
Badari Pulavartye3222c42007-05-08 00:25:21 -070081 goto out_uts;
Cedric Le Goater467e9f42007-07-15 23:41:06 -070082 }
Badari Pulavartye3222c42007-05-08 00:25:21 -070083
84 new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns);
Cedric Le Goater467e9f42007-07-15 23:41:06 -070085 if (IS_ERR(new_nsp->ipc_ns)) {
86 err = PTR_ERR(new_nsp->ipc_ns);
Badari Pulavartye3222c42007-05-08 00:25:21 -070087 goto out_ipc;
Cedric Le Goater467e9f42007-07-15 23:41:06 -070088 }
Badari Pulavartye3222c42007-05-08 00:25:21 -070089
90 new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns);
Cedric Le Goater467e9f42007-07-15 23:41:06 -070091 if (IS_ERR(new_nsp->pid_ns)) {
92 err = PTR_ERR(new_nsp->pid_ns);
Badari Pulavartye3222c42007-05-08 00:25:21 -070093 goto out_pid;
Cedric Le Goater467e9f42007-07-15 23:41:06 -070094 }
Badari Pulavartye3222c42007-05-08 00:25:21 -070095
Cedric Le Goateracce2922007-07-15 23:40:59 -070096 new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns);
Cedric Le Goater467e9f42007-07-15 23:41:06 -070097 if (IS_ERR(new_nsp->user_ns)) {
98 err = PTR_ERR(new_nsp->user_ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -070099 goto out_user;
Cedric Le Goater467e9f42007-07-15 23:41:06 -0700100 }
Cedric Le Goateracce2922007-07-15 23:40:59 -0700101
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700102 new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
103 if (IS_ERR(new_nsp->net_ns)) {
104 err = PTR_ERR(new_nsp->net_ns);
105 goto out_net;
106 }
107
Badari Pulavartye3222c42007-05-08 00:25:21 -0700108 return new_nsp;
109
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700110out_net:
111 if (new_nsp->user_ns)
112 put_user_ns(new_nsp->user_ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700113out_user:
114 if (new_nsp->pid_ns)
115 put_pid_ns(new_nsp->pid_ns);
Badari Pulavartye3222c42007-05-08 00:25:21 -0700116out_pid:
117 if (new_nsp->ipc_ns)
118 put_ipc_ns(new_nsp->ipc_ns);
119out_ipc:
120 if (new_nsp->uts_ns)
121 put_uts_ns(new_nsp->uts_ns);
122out_uts:
123 if (new_nsp->mnt_ns)
124 put_mnt_ns(new_nsp->mnt_ns);
125out_ns:
Cedric Le Goater98c0d072007-07-15 23:41:07 -0700126 kmem_cache_free(nsproxy_cachep, new_nsp);
Cedric Le Goater467e9f42007-07-15 23:41:06 -0700127 return ERR_PTR(err);
Serge E. Hallynab516012006-10-02 02:18:06 -0700128}
129
130/*
131 * called from clone. This now handles copy for nsproxy and all
132 * namespaces therein.
133 */
Eric W. Biederman213dd262007-07-15 23:41:15 -0700134int copy_namespaces(unsigned long flags, struct task_struct *tsk)
Serge E. Hallynab516012006-10-02 02:18:06 -0700135{
136 struct nsproxy *old_ns = tsk->nsproxy;
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700137 struct nsproxy *new_ns;
138 int err = 0;
Serge E. Hallynab516012006-10-02 02:18:06 -0700139
140 if (!old_ns)
141 return 0;
142
143 get_nsproxy(old_ns);
144
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700145 if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER | CLONE_NEWNET)))
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700146 return 0;
147
Badari Pulavartye3222c42007-05-08 00:25:21 -0700148 if (!capable(CAP_SYS_ADMIN)) {
149 err = -EPERM;
150 goto out;
151 }
152
153 new_ns = create_new_namespaces(flags, tsk, tsk->fs);
154 if (IS_ERR(new_ns)) {
155 err = PTR_ERR(new_ns);
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700156 goto out;
157 }
158
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700159 err = ns_cgroup_clone(tsk);
160 if (err) {
161 put_nsproxy(new_ns);
162 goto out;
163 }
164
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700165 tsk->nsproxy = new_ns;
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700166
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700167out:
Linus Torvalds444f3782007-01-30 13:35:18 -0800168 put_nsproxy(old_ns);
Serge E. Hallyn1651e142006-10-02 02:18:08 -0700169 return err;
Serge E. Hallynab516012006-10-02 02:18:06 -0700170}
171
172void free_nsproxy(struct nsproxy *ns)
173{
Cedric Le Goater9a575a92006-12-08 02:37:59 -0800174 if (ns->mnt_ns)
175 put_mnt_ns(ns->mnt_ns);
176 if (ns->uts_ns)
177 put_uts_ns(ns->uts_ns);
178 if (ns->ipc_ns)
179 put_ipc_ns(ns->ipc_ns);
180 if (ns->pid_ns)
181 put_pid_ns(ns->pid_ns);
Cedric Le Goateracce2922007-07-15 23:40:59 -0700182 if (ns->user_ns)
183 put_user_ns(ns->user_ns);
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700184 put_net(ns->net_ns);
Cedric Le Goater98c0d072007-07-15 23:41:07 -0700185 kmem_cache_free(nsproxy_cachep, ns);
Serge E. Hallynab516012006-10-02 02:18:06 -0700186}
Badari Pulavartye3222c42007-05-08 00:25:21 -0700187
188/*
189 * Called from unshare. Unshare all the namespaces part of nsproxy.
Cedric Le Goater4e71e4742007-06-23 17:16:25 -0700190 * On success, returns the new nsproxy.
Badari Pulavartye3222c42007-05-08 00:25:21 -0700191 */
192int unshare_nsproxy_namespaces(unsigned long unshare_flags,
193 struct nsproxy **new_nsp, struct fs_struct *new_fs)
194{
Badari Pulavartye3222c42007-05-08 00:25:21 -0700195 int err = 0;
196
Serge E. Hallyn77ec7392007-07-15 23:41:01 -0700197 if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700198 CLONE_NEWUSER | CLONE_NEWNET)))
Badari Pulavartye3222c42007-05-08 00:25:21 -0700199 return 0;
200
Badari Pulavartye3222c42007-05-08 00:25:21 -0700201 if (!capable(CAP_SYS_ADMIN))
202 return -EPERM;
203
Badari Pulavartye3222c42007-05-08 00:25:21 -0700204 *new_nsp = create_new_namespaces(unshare_flags, current,
205 new_fs ? new_fs : current->fs);
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700206 if (IS_ERR(*new_nsp)) {
Badari Pulavartye3222c42007-05-08 00:25:21 -0700207 err = PTR_ERR(*new_nsp);
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700208 goto out;
209 }
210
211 err = ns_cgroup_clone(current);
212 if (err)
213 put_nsproxy(*new_nsp);
214
215out:
Badari Pulavartye3222c42007-05-08 00:25:21 -0700216 return err;
217}
Cedric Le Goater98c0d072007-07-15 23:41:07 -0700218
219static int __init nsproxy_cache_init(void)
220{
Pavel Emelyanovdb8906d2007-10-16 23:30:11 -0700221 nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC);
Cedric Le Goater98c0d072007-07-15 23:41:07 -0700222 return 0;
223}
224
225module_init(nsproxy_cache_init);