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ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
1 /*
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.
25b21cb [PATCH] IPC namespace core
Kirill Korotaev authored
10 *
11 * Jun 2006 - namespaces support
12 * OpenVZ, SWsoft Inc.
13 * Pavel Emelianov <xemul@openvz.org>
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
14 */
15
5a0e3ad include cleanup: Update gfp.h and slab.h includes to prepare for brea…
Tejun Heo authored
16 #include <linux/slab.h>
9984de1 @paulgortmaker kernel: Map most files to use export.h instead of module.h
paulgortmaker authored
17 #include <linux/export.h>
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
18 #include <linux/nsproxy.h>
0437eb5 [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c
Serge E. Hallyn authored
19 #include <linux/init_task.h>
6b3286e [PATCH] rename struct namespace to struct mnt_namespace
Kirill Korotaev authored
20 #include <linux/mnt_namespace.h>
4865ecf [PATCH] namespaces: utsname: implement utsname namespaces
Serge E. Hallyn authored
21 #include <linux/utsname.h>
9a575a9 @legoater [PATCH] to nsproxy
legoater authored
22 #include <linux/pid_namespace.h>
9dd776b @ebiederm [NET]: Add network namespace clone & unshare support.
ebiederm authored
23 #include <net/net_namespace.h>
ae5e1b2 @xemul namespaces: move the IPC namespace under IPC_NS option
xemul authored
24 #include <linux/ipc_namespace.h>
0663c6f @ebiederm ns: Introduce the setns syscall
ebiederm authored
25 #include <linux/proc_fs.h>
26 #include <linux/file.h>
27 #include <linux/syscalls.h>
0437eb5 [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c
Serge E. Hallyn authored
28
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
29 static struct kmem_cache *nsproxy_cachep;
30
8467005 nsproxy: remove INIT_NSPROXY()
Alexey Dobriyan authored
31 struct nsproxy init_nsproxy = {
32 .count = ATOMIC_INIT(1),
33 .uts_ns = &init_uts_ns,
34 #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC)
35 .ipc_ns = &init_ipc_ns,
36 #endif
37 .mnt_ns = NULL,
38 .pid_ns = &init_pid_ns,
39 #ifdef CONFIG_NET
40 .net_ns = &init_net,
41 #endif
42 };
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
43
90af90d nsproxy: extract create_nsproxy()
Alexey Dobriyan authored
44 static inline struct nsproxy *create_nsproxy(void)
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
45 {
90af90d nsproxy: extract create_nsproxy()
Alexey Dobriyan authored
46 struct nsproxy *nsproxy;
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
47
90af90d nsproxy: extract create_nsproxy()
Alexey Dobriyan authored
48 nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
49 if (nsproxy)
50 atomic_set(&nsproxy->count, 1);
51 return nsproxy;
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
52 }
53
54 /*
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
55 * Create new nsproxy and all of its the associated namespaces.
56 * Return the newly created nsproxy. Do not attach this to the task,
57 * leave it to the caller to do proper locking and attach it to task.
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
58 */
213dd26 @ebiederm namespace: ensure clone_flags are always stored in an unsigned long
ebiederm authored
59 static struct nsproxy *create_new_namespaces(unsigned long flags,
60 struct task_struct *tsk, struct fs_struct *new_fs)
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
61 {
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
62 struct nsproxy *new_nsp;
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
63 int err;
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
64
90af90d nsproxy: extract create_nsproxy()
Alexey Dobriyan authored
65 new_nsp = create_nsproxy();
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
66 if (!new_nsp)
67 return ERR_PTR(-ENOMEM);
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
68
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
69 new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs);
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
70 if (IS_ERR(new_nsp->mnt_ns)) {
71 err = PTR_ERR(new_nsp->mnt_ns);
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
72 goto out_ns;
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
73 }
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
74
bb96a6f @hallyn userns: allow sethostname in a container
hallyn authored
75 new_nsp->uts_ns = copy_utsname(flags, tsk);
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
76 if (IS_ERR(new_nsp->uts_ns)) {
77 err = PTR_ERR(new_nsp->uts_ns);
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
78 goto out_uts;
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
79 }
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
80
b0e7759 @hallyn userns: user namespaces: convert several capable() calls
hallyn authored
81 new_nsp->ipc_ns = copy_ipcs(flags, tsk);
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
82 if (IS_ERR(new_nsp->ipc_ns)) {
83 err = PTR_ERR(new_nsp->ipc_ns);
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
84 goto out_ipc;
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
85 }
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
86
2894d65 pid namespaces: define and use task_active_pid_ns() wrapper
Sukadev Bhattiprolu authored
87 new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk));
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
88 if (IS_ERR(new_nsp->pid_ns)) {
89 err = PTR_ERR(new_nsp->pid_ns);
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
90 goto out_pid;
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
91 }
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
92
9dd776b @ebiederm [NET]: Add network namespace clone & unshare support.
ebiederm authored
93 new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns);
94 if (IS_ERR(new_nsp->net_ns)) {
95 err = PTR_ERR(new_nsp->net_ns);
96 goto out_net;
97 }
98
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
99 return new_nsp;
100
9dd776b @ebiederm [NET]: Add network namespace clone & unshare support.
ebiederm authored
101 out_net:
acce292 @legoater user namespace: add the framework
legoater authored
102 if (new_nsp->pid_ns)
103 put_pid_ns(new_nsp->pid_ns);
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
104 out_pid:
105 if (new_nsp->ipc_ns)
106 put_ipc_ns(new_nsp->ipc_ns);
107 out_ipc:
108 if (new_nsp->uts_ns)
109 put_uts_ns(new_nsp->uts_ns);
110 out_uts:
111 if (new_nsp->mnt_ns)
112 put_mnt_ns(new_nsp->mnt_ns);
113 out_ns:
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
114 kmem_cache_free(nsproxy_cachep, new_nsp);
467e9f4 @legoater fix create_new_namespaces() return value
legoater authored
115 return ERR_PTR(err);
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
116 }
117
118 /*
119 * called from clone. This now handles copy for nsproxy and all
120 * namespaces therein.
121 */
213dd26 @ebiederm namespace: ensure clone_flags are always stored in an unsigned long
ebiederm authored
122 int copy_namespaces(unsigned long flags, struct task_struct *tsk)
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
123 {
124 struct nsproxy *old_ns = tsk->nsproxy;
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
125 struct nsproxy *new_ns;
126 int err = 0;
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
127
128 if (!old_ns)
129 return 0;
130
131 get_nsproxy(old_ns);
132
30e49c2 @xemul pid namespaces: allow cloning of new namespace
xemul authored
133 if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
18b6e04 User namespaces: set of cleanups (v2)
Serge Hallyn authored
134 CLONE_NEWPID | CLONE_NEWNET)))
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
135 return 0;
136
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
137 if (!capable(CAP_SYS_ADMIN)) {
138 err = -EPERM;
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
139 goto out;
140 }
141
02fdb36 ipc: sysvsem: refuse clone(CLONE_SYSVSEM|CLONE_NEWIPC)
Serge E. Hallyn authored
142 /*
143 * CLONE_NEWIPC must detach from the undolist: after switching
144 * to a new ipc namespace, the semaphore arrays from the old
145 * namespace are unreachable. In clone parlance, CLONE_SYSVSEM
146 * means share undolist with parent, so we must forbid using
147 * it along with CLONE_NEWIPC.
148 */
149 if ((flags & CLONE_NEWIPC) && (flags & CLONE_SYSVSEM)) {
150 err = -EINVAL;
151 goto out;
152 }
153
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
154 new_ns = create_new_namespaces(flags, tsk, tsk->fs);
155 if (IS_ERR(new_ns)) {
156 err = PTR_ERR(new_ns);
157 goto out;
158 }
9a575a9 @legoater [PATCH] to nsproxy
legoater authored
159
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
160 tsk->nsproxy = new_ns;
858d72e cgroups: implement namespace tracking subsystem
Serge E. Hallyn authored
161
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
162 out:
444f378 Revert "[PATCH] namespaces: fix exit race by splitting exit"
Linus Torvalds authored
163 put_nsproxy(old_ns);
1651e14 [PATCH] namespaces: incorporate fs namespace into nsproxy
Serge E. Hallyn authored
164 return err;
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
165 }
166
167 void free_nsproxy(struct nsproxy *ns)
168 {
9a575a9 @legoater [PATCH] to nsproxy
legoater authored
169 if (ns->mnt_ns)
170 put_mnt_ns(ns->mnt_ns);
171 if (ns->uts_ns)
172 put_uts_ns(ns->uts_ns);
173 if (ns->ipc_ns)
174 put_ipc_ns(ns->ipc_ns);
175 if (ns->pid_ns)
176 put_pid_ns(ns->pid_ns);
9dd776b @ebiederm [NET]: Add network namespace clone & unshare support.
ebiederm authored
177 put_net(ns->net_ns);
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
178 kmem_cache_free(nsproxy_cachep, ns);
ab51601 [PATCH] namespaces: add nsproxy
Serge E. Hallyn authored
179 }
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
180
181 /*
182 * Called from unshare. Unshare all the namespaces part of nsproxy.
4e71e47 @legoater fix refcounting of nsproxy object when unshared
legoater authored
183 * On success, returns the new nsproxy.
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
184 */
185 int unshare_nsproxy_namespaces(unsigned long unshare_flags,
186 struct nsproxy **new_nsp, struct fs_struct *new_fs)
187 {
188 int err = 0;
189
77ec739 user namespace: add unshare
Serge E. Hallyn authored
190 if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
18b6e04 User namespaces: set of cleanups (v2)
Serge Hallyn authored
191 CLONE_NEWNET)))
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
192 return 0;
193
194 if (!capable(CAP_SYS_ADMIN))
195 return -EPERM;
196
197 *new_nsp = create_new_namespaces(unshare_flags, current,
198 new_fs ? new_fs : current->fs);
858d72e cgroups: implement namespace tracking subsystem
Serge E. Hallyn authored
199 if (IS_ERR(*new_nsp)) {
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
200 err = PTR_ERR(*new_nsp);
858d72e cgroups: implement namespace tracking subsystem
Serge E. Hallyn authored
201 goto out;
202 }
203
204 out:
e3222c4 Merge sys_clone()/sys_unshare() nsproxy and namespace handling
Badari Pulavarty authored
205 return err;
206 }
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
207
cf7b708 @xemul Make access to task's nsproxy lighter
xemul authored
208 void switch_task_namespaces(struct task_struct *p, struct nsproxy *new)
209 {
210 struct nsproxy *ns;
211
212 might_sleep();
213
214 ns = p->nsproxy;
215
216 rcu_assign_pointer(p->nsproxy, new);
217
218 if (ns && atomic_dec_and_test(&ns->count)) {
219 /*
220 * wait for others to get what they want from this nsproxy.
221 *
222 * cannot release this nsproxy via the call_rcu() since
223 * put_mnt_ns() will want to sleep
224 */
225 synchronize_rcu();
226 free_nsproxy(ns);
227 }
228 }
229
230 void exit_task_namespaces(struct task_struct *p)
231 {
232 switch_task_namespaces(p, NULL);
233 }
234
0663c6f @ebiederm ns: Introduce the setns syscall
ebiederm authored
235 SYSCALL_DEFINE2(setns, int, fd, int, nstype)
236 {
237 const struct proc_ns_operations *ops;
238 struct task_struct *tsk = current;
239 struct nsproxy *new_nsproxy;
240 struct proc_inode *ei;
241 struct file *file;
242 int err;
243
244 if (!capable(CAP_SYS_ADMIN))
245 return -EPERM;
246
247 file = proc_ns_fget(fd);
248 if (IS_ERR(file))
249 return PTR_ERR(file);
250
251 err = -EINVAL;
252 ei = PROC_I(file->f_dentry->d_inode);
253 ops = ei->ns_ops;
254 if (nstype && (ops->type != nstype))
255 goto out;
256
257 new_nsproxy = create_new_namespaces(0, tsk, tsk->fs);
258 if (IS_ERR(new_nsproxy)) {
259 err = PTR_ERR(new_nsproxy);
260 goto out;
261 }
262
263 err = ops->install(new_nsproxy, ei->ns);
264 if (err) {
265 free_nsproxy(new_nsproxy);
266 goto out;
267 }
268 switch_task_namespaces(tsk, new_nsproxy);
269 out:
270 fput(file);
271 return err;
272 }
273
6657719 make sure that nsproxy_cache is initialized early enough
Al Viro authored
274 int __init nsproxy_cache_init(void)
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
275 {
db8906d @xemul Use KMEM_CACHE macro to create the nsproxy cache
xemul authored
276 nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC);
98c0d07 @legoater add a kmem_cache for nsproxy objects
legoater authored
277 return 0;
278 }
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