Commit | Line | Data |
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ab516013 SH |
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. | |
25b21cb2 KK |
10 | * |
11 | * Jun 2006 - namespaces support | |
12 | * OpenVZ, SWsoft Inc. | |
13 | * Pavel Emelianov <xemul@openvz.org> | |
ab516013 SH |
14 | */ |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/version.h> | |
18 | #include <linux/nsproxy.h> | |
0437eb59 | 19 | #include <linux/init_task.h> |
6b3286ed | 20 | #include <linux/mnt_namespace.h> |
4865ecf1 | 21 | #include <linux/utsname.h> |
9a575a92 | 22 | #include <linux/pid_namespace.h> |
9dd776b6 | 23 | #include <net/net_namespace.h> |
0437eb59 | 24 | |
98c0d07c CLG |
25 | static struct kmem_cache *nsproxy_cachep; |
26 | ||
0437eb59 | 27 | struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); |
ab516013 SH |
28 | |
29 | static inline void get_nsproxy(struct nsproxy *ns) | |
30 | { | |
31 | atomic_inc(&ns->count); | |
32 | } | |
33 | ||
34 | void 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. | |
ab516013 | 44 | */ |
e3222c4e | 45 | static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) |
ab516013 SH |
46 | { |
47 | struct nsproxy *ns; | |
48 | ||
98c0d07c CLG |
49 | ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL); |
50 | if (ns) { | |
51 | memcpy(ns, orig, sizeof(struct nsproxy)); | |
ab516013 | 52 | atomic_set(&ns->count, 1); |
98c0d07c | 53 | } |
ab516013 SH |
54 | return ns; |
55 | } | |
56 | ||
57 | /* | |
e3222c4e BP |
58 | * 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. | |
ab516013 | 61 | */ |
213dd266 EB |
62 | static struct nsproxy *create_new_namespaces(unsigned long flags, |
63 | struct task_struct *tsk, struct fs_struct *new_fs) | |
ab516013 | 64 | { |
e3222c4e | 65 | struct nsproxy *new_nsp; |
467e9f4b | 66 | int err; |
ab516013 | 67 | |
e3222c4e BP |
68 | new_nsp = clone_nsproxy(tsk->nsproxy); |
69 | if (!new_nsp) | |
70 | return ERR_PTR(-ENOMEM); | |
1651e14e | 71 | |
e3222c4e | 72 | new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); |
467e9f4b CLG |
73 | if (IS_ERR(new_nsp->mnt_ns)) { |
74 | err = PTR_ERR(new_nsp->mnt_ns); | |
e3222c4e | 75 | goto out_ns; |
467e9f4b | 76 | } |
e3222c4e BP |
77 | |
78 | new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); | |
467e9f4b CLG |
79 | if (IS_ERR(new_nsp->uts_ns)) { |
80 | err = PTR_ERR(new_nsp->uts_ns); | |
e3222c4e | 81 | goto out_uts; |
467e9f4b | 82 | } |
e3222c4e BP |
83 | |
84 | new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); | |
467e9f4b CLG |
85 | if (IS_ERR(new_nsp->ipc_ns)) { |
86 | err = PTR_ERR(new_nsp->ipc_ns); | |
e3222c4e | 87 | goto out_ipc; |
467e9f4b | 88 | } |
e3222c4e BP |
89 | |
90 | new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); | |
467e9f4b CLG |
91 | if (IS_ERR(new_nsp->pid_ns)) { |
92 | err = PTR_ERR(new_nsp->pid_ns); | |
e3222c4e | 93 | goto out_pid; |
467e9f4b | 94 | } |
e3222c4e | 95 | |
acce292c | 96 | new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns); |
467e9f4b CLG |
97 | if (IS_ERR(new_nsp->user_ns)) { |
98 | err = PTR_ERR(new_nsp->user_ns); | |
acce292c | 99 | goto out_user; |
467e9f4b | 100 | } |
acce292c | 101 | |
9dd776b6 EB |
102 | 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 | ||
e3222c4e BP |
108 | return new_nsp; |
109 | ||
9dd776b6 EB |
110 | out_net: |
111 | if (new_nsp->user_ns) | |
112 | put_user_ns(new_nsp->user_ns); | |
acce292c CLG |
113 | out_user: |
114 | if (new_nsp->pid_ns) | |
115 | put_pid_ns(new_nsp->pid_ns); | |
e3222c4e BP |
116 | out_pid: |
117 | if (new_nsp->ipc_ns) | |
118 | put_ipc_ns(new_nsp->ipc_ns); | |
119 | out_ipc: | |
120 | if (new_nsp->uts_ns) | |
121 | put_uts_ns(new_nsp->uts_ns); | |
122 | out_uts: | |
123 | if (new_nsp->mnt_ns) | |
124 | put_mnt_ns(new_nsp->mnt_ns); | |
125 | out_ns: | |
98c0d07c | 126 | kmem_cache_free(nsproxy_cachep, new_nsp); |
467e9f4b | 127 | return ERR_PTR(err); |
ab516013 SH |
128 | } |
129 | ||
130 | /* | |
131 | * called from clone. This now handles copy for nsproxy and all | |
132 | * namespaces therein. | |
133 | */ | |
213dd266 | 134 | int copy_namespaces(unsigned long flags, struct task_struct *tsk) |
ab516013 SH |
135 | { |
136 | struct nsproxy *old_ns = tsk->nsproxy; | |
1651e14e SH |
137 | struct nsproxy *new_ns; |
138 | int err = 0; | |
ab516013 SH |
139 | |
140 | if (!old_ns) | |
141 | return 0; | |
142 | ||
143 | get_nsproxy(old_ns); | |
144 | ||
9dd776b6 | 145 | if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER | CLONE_NEWNET))) |
1651e14e SH |
146 | return 0; |
147 | ||
e3222c4e BP |
148 | if (!capable(CAP_SYS_ADMIN)) { |
149 | err = -EPERM; | |
1651e14e SH |
150 | goto out; |
151 | } | |
152 | ||
e3222c4e BP |
153 | new_ns = create_new_namespaces(flags, tsk, tsk->fs); |
154 | if (IS_ERR(new_ns)) { | |
155 | err = PTR_ERR(new_ns); | |
156 | goto out; | |
157 | } | |
9a575a92 | 158 | |
e3222c4e | 159 | tsk->nsproxy = new_ns; |
1651e14e | 160 | out: |
444f378b | 161 | put_nsproxy(old_ns); |
1651e14e | 162 | return err; |
ab516013 SH |
163 | } |
164 | ||
165 | void free_nsproxy(struct nsproxy *ns) | |
166 | { | |
9a575a92 CLG |
167 | if (ns->mnt_ns) |
168 | put_mnt_ns(ns->mnt_ns); | |
169 | if (ns->uts_ns) | |
170 | put_uts_ns(ns->uts_ns); | |
171 | if (ns->ipc_ns) | |
172 | put_ipc_ns(ns->ipc_ns); | |
173 | if (ns->pid_ns) | |
174 | put_pid_ns(ns->pid_ns); | |
acce292c CLG |
175 | if (ns->user_ns) |
176 | put_user_ns(ns->user_ns); | |
9dd776b6 | 177 | put_net(ns->net_ns); |
98c0d07c | 178 | kmem_cache_free(nsproxy_cachep, ns); |
ab516013 | 179 | } |
e3222c4e BP |
180 | |
181 | /* | |
182 | * Called from unshare. Unshare all the namespaces part of nsproxy. | |
4e71e474 | 183 | * On success, returns the new nsproxy. |
e3222c4e BP |
184 | */ |
185 | int unshare_nsproxy_namespaces(unsigned long unshare_flags, | |
186 | struct nsproxy **new_nsp, struct fs_struct *new_fs) | |
187 | { | |
e3222c4e BP |
188 | int err = 0; |
189 | ||
77ec739d | 190 | if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
9dd776b6 | 191 | CLONE_NEWUSER | CLONE_NEWNET))) |
e3222c4e BP |
192 | return 0; |
193 | ||
e3222c4e BP |
194 | if (!capable(CAP_SYS_ADMIN)) |
195 | return -EPERM; | |
196 | ||
e3222c4e BP |
197 | *new_nsp = create_new_namespaces(unshare_flags, current, |
198 | new_fs ? new_fs : current->fs); | |
4e71e474 | 199 | if (IS_ERR(*new_nsp)) |
e3222c4e | 200 | err = PTR_ERR(*new_nsp); |
e3222c4e BP |
201 | return err; |
202 | } | |
98c0d07c CLG |
203 | |
204 | static int __init nsproxy_cache_init(void) | |
205 | { | |
206 | nsproxy_cachep = kmem_cache_create("nsproxy", sizeof(struct nsproxy), | |
20c2df83 | 207 | 0, SLAB_PANIC, NULL); |
98c0d07c CLG |
208 | return 0; |
209 | } | |
210 | ||
211 | module_init(nsproxy_cache_init); |