Commit | Line | Data |
---|---|---|
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> |
0437eb59 SH |
23 | |
24 | struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); | |
ab516013 SH |
25 | |
26 | static inline void get_nsproxy(struct nsproxy *ns) | |
27 | { | |
28 | atomic_inc(&ns->count); | |
29 | } | |
30 | ||
31 | void get_task_namespaces(struct task_struct *tsk) | |
32 | { | |
33 | struct nsproxy *ns = tsk->nsproxy; | |
34 | if (ns) { | |
35 | get_nsproxy(ns); | |
36 | } | |
37 | } | |
38 | ||
39 | /* | |
40 | * creates a copy of "orig" with refcount 1. | |
ab516013 | 41 | */ |
e3222c4e | 42 | static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) |
ab516013 SH |
43 | { |
44 | struct nsproxy *ns; | |
45 | ||
e05d722e | 46 | ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL); |
5f8442ed | 47 | if (ns) |
ab516013 | 48 | atomic_set(&ns->count, 1); |
ab516013 SH |
49 | return ns; |
50 | } | |
51 | ||
52 | /* | |
e3222c4e BP |
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. | |
ab516013 | 56 | */ |
e3222c4e BP |
57 | static struct nsproxy *create_new_namespaces(int flags, struct task_struct *tsk, |
58 | struct fs_struct *new_fs) | |
ab516013 | 59 | { |
e3222c4e | 60 | struct nsproxy *new_nsp; |
467e9f4b | 61 | int err; |
ab516013 | 62 | |
e3222c4e BP |
63 | new_nsp = clone_nsproxy(tsk->nsproxy); |
64 | if (!new_nsp) | |
65 | return ERR_PTR(-ENOMEM); | |
1651e14e | 66 | |
e3222c4e | 67 | new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); |
467e9f4b CLG |
68 | if (IS_ERR(new_nsp->mnt_ns)) { |
69 | err = PTR_ERR(new_nsp->mnt_ns); | |
e3222c4e | 70 | goto out_ns; |
467e9f4b | 71 | } |
e3222c4e BP |
72 | |
73 | new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); | |
467e9f4b CLG |
74 | if (IS_ERR(new_nsp->uts_ns)) { |
75 | err = PTR_ERR(new_nsp->uts_ns); | |
e3222c4e | 76 | goto out_uts; |
467e9f4b | 77 | } |
e3222c4e BP |
78 | |
79 | new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); | |
467e9f4b CLG |
80 | if (IS_ERR(new_nsp->ipc_ns)) { |
81 | err = PTR_ERR(new_nsp->ipc_ns); | |
e3222c4e | 82 | goto out_ipc; |
467e9f4b | 83 | } |
e3222c4e BP |
84 | |
85 | new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); | |
467e9f4b CLG |
86 | if (IS_ERR(new_nsp->pid_ns)) { |
87 | err = PTR_ERR(new_nsp->pid_ns); | |
e3222c4e | 88 | goto out_pid; |
467e9f4b | 89 | } |
e3222c4e | 90 | |
acce292c | 91 | new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns); |
467e9f4b CLG |
92 | if (IS_ERR(new_nsp->user_ns)) { |
93 | err = PTR_ERR(new_nsp->user_ns); | |
acce292c | 94 | goto out_user; |
467e9f4b | 95 | } |
acce292c | 96 | |
e3222c4e BP |
97 | return new_nsp; |
98 | ||
acce292c CLG |
99 | out_user: |
100 | if (new_nsp->pid_ns) | |
101 | put_pid_ns(new_nsp->pid_ns); | |
e3222c4e BP |
102 | out_pid: |
103 | if (new_nsp->ipc_ns) | |
104 | put_ipc_ns(new_nsp->ipc_ns); | |
105 | out_ipc: | |
106 | if (new_nsp->uts_ns) | |
107 | put_uts_ns(new_nsp->uts_ns); | |
108 | out_uts: | |
109 | if (new_nsp->mnt_ns) | |
110 | put_mnt_ns(new_nsp->mnt_ns); | |
111 | out_ns: | |
112 | kfree(new_nsp); | |
467e9f4b | 113 | return ERR_PTR(err); |
ab516013 SH |
114 | } |
115 | ||
116 | /* | |
117 | * called from clone. This now handles copy for nsproxy and all | |
118 | * namespaces therein. | |
119 | */ | |
120 | int copy_namespaces(int flags, struct task_struct *tsk) | |
121 | { | |
122 | struct nsproxy *old_ns = tsk->nsproxy; | |
1651e14e SH |
123 | struct nsproxy *new_ns; |
124 | int err = 0; | |
ab516013 SH |
125 | |
126 | if (!old_ns) | |
127 | return 0; | |
128 | ||
129 | get_nsproxy(old_ns); | |
130 | ||
77ec739d | 131 | if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER))) |
1651e14e SH |
132 | return 0; |
133 | ||
e3222c4e BP |
134 | if (!capable(CAP_SYS_ADMIN)) { |
135 | err = -EPERM; | |
1651e14e SH |
136 | goto out; |
137 | } | |
138 | ||
e3222c4e BP |
139 | new_ns = create_new_namespaces(flags, tsk, tsk->fs); |
140 | if (IS_ERR(new_ns)) { | |
141 | err = PTR_ERR(new_ns); | |
142 | goto out; | |
143 | } | |
9a575a92 | 144 | |
e3222c4e | 145 | tsk->nsproxy = new_ns; |
1651e14e | 146 | out: |
444f378b | 147 | put_nsproxy(old_ns); |
1651e14e | 148 | return err; |
ab516013 SH |
149 | } |
150 | ||
151 | void free_nsproxy(struct nsproxy *ns) | |
152 | { | |
9a575a92 CLG |
153 | if (ns->mnt_ns) |
154 | put_mnt_ns(ns->mnt_ns); | |
155 | if (ns->uts_ns) | |
156 | put_uts_ns(ns->uts_ns); | |
157 | if (ns->ipc_ns) | |
158 | put_ipc_ns(ns->ipc_ns); | |
159 | if (ns->pid_ns) | |
160 | put_pid_ns(ns->pid_ns); | |
acce292c CLG |
161 | if (ns->user_ns) |
162 | put_user_ns(ns->user_ns); | |
9a575a92 | 163 | kfree(ns); |
ab516013 | 164 | } |
e3222c4e BP |
165 | |
166 | /* | |
167 | * Called from unshare. Unshare all the namespaces part of nsproxy. | |
4e71e474 | 168 | * On success, returns the new nsproxy. |
e3222c4e BP |
169 | */ |
170 | int unshare_nsproxy_namespaces(unsigned long unshare_flags, | |
171 | struct nsproxy **new_nsp, struct fs_struct *new_fs) | |
172 | { | |
e3222c4e BP |
173 | int err = 0; |
174 | ||
77ec739d SH |
175 | if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
176 | CLONE_NEWUSER))) | |
e3222c4e BP |
177 | return 0; |
178 | ||
e3222c4e BP |
179 | if (!capable(CAP_SYS_ADMIN)) |
180 | return -EPERM; | |
181 | ||
e3222c4e BP |
182 | *new_nsp = create_new_namespaces(unshare_flags, current, |
183 | new_fs ? new_fs : current->fs); | |
4e71e474 | 184 | if (IS_ERR(*new_nsp)) |
e3222c4e | 185 | err = PTR_ERR(*new_nsp); |
e3222c4e BP |
186 | return err; |
187 | } |