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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - kernel/nsproxy.c
1bc4b55241a8c720e16a5ed12efd108875229dcc
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
;
62 new_nsp
= clone_nsproxy(tsk
->nsproxy
);
64 return ERR_PTR(-ENOMEM
);
66 new_nsp
->mnt_ns
= copy_mnt_ns(flags
, tsk
->nsproxy
->mnt_ns
, new_fs
);
67 if (IS_ERR(new_nsp
->mnt_ns
))
70 new_nsp
->uts_ns
= copy_utsname(flags
, tsk
->nsproxy
->uts_ns
);
71 if (IS_ERR(new_nsp
->uts_ns
))
74 new_nsp
->ipc_ns
= copy_ipcs(flags
, tsk
->nsproxy
->ipc_ns
);
75 if (IS_ERR(new_nsp
->ipc_ns
))
78 new_nsp
->pid_ns
= copy_pid_ns(flags
, tsk
->nsproxy
->pid_ns
);
79 if (IS_ERR(new_nsp
->pid_ns
))
86 put_ipc_ns(new_nsp
->ipc_ns
);
89 put_uts_ns(new_nsp
->uts_ns
);
92 put_mnt_ns(new_nsp
->mnt_ns
);
95 return ERR_PTR(-ENOMEM
);
99 * called from clone. This now handles copy for nsproxy and all
100 * namespaces therein.
102 int copy_namespaces(int flags
, struct task_struct
*tsk
)
104 struct nsproxy
*old_ns
= tsk
->nsproxy
;
105 struct nsproxy
*new_ns
;
113 if (!(flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
)))
116 if (!capable(CAP_SYS_ADMIN
)) {
121 new_ns
= create_new_namespaces(flags
, tsk
, tsk
->fs
);
122 if (IS_ERR(new_ns
)) {
123 err
= PTR_ERR(new_ns
);
127 tsk
->nsproxy
= new_ns
;
133 void free_nsproxy(struct nsproxy
*ns
)
136 put_mnt_ns(ns
->mnt_ns
);
138 put_uts_ns(ns
->uts_ns
);
140 put_ipc_ns(ns
->ipc_ns
);
142 put_pid_ns(ns
->pid_ns
);
147 * Called from unshare. Unshare all the namespaces part of nsproxy.
148 * On sucess, returns the new nsproxy and a reference to old nsproxy
149 * to make sure it stays around.
151 int unshare_nsproxy_namespaces(unsigned long unshare_flags
,
152 struct nsproxy
**new_nsp
, struct fs_struct
*new_fs
)
154 struct nsproxy
*old_ns
= current
->nsproxy
;
157 if (!(unshare_flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
)))
160 #ifndef CONFIG_IPC_NS
161 if (unshare_flags
& CLONE_NEWIPC
)
165 #ifndef CONFIG_UTS_NS
166 if (unshare_flags
& CLONE_NEWUTS
)
170 if (!capable(CAP_SYS_ADMIN
))
175 *new_nsp
= create_new_namespaces(unshare_flags
, current
,
176 new_fs
? new_fs
: current
->fs
);
177 if (IS_ERR(*new_nsp
)) {
178 err
= PTR_ERR(*new_nsp
);