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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - kernel/nsproxy.c
f5b9ee6f6bbb02733cef1e64fabe4dc521efc767
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.
41 * This does not grab references to the contained namespaces,
42 * so that needs to be done by dup_namespaces.
44 static inline struct nsproxy
*clone_namespaces(struct nsproxy
*orig
)
48 ns
= kmemdup(orig
, sizeof(struct nsproxy
), GFP_KERNEL
);
50 atomic_set(&ns
->count
, 1);
55 * copies the nsproxy, setting refcount to 1, and grabbing a
56 * reference to all contained namespaces. Called from
59 struct nsproxy
*dup_namespaces(struct nsproxy
*orig
)
61 struct nsproxy
*ns
= clone_namespaces(orig
);
65 get_mnt_ns(ns
->mnt_ns
);
67 get_uts_ns(ns
->uts_ns
);
69 get_ipc_ns(ns
->ipc_ns
);
71 get_pid_ns(ns
->pid_ns
);
78 * called from clone. This now handles copy for nsproxy and all
81 int copy_namespaces(int flags
, struct task_struct
*tsk
)
83 struct nsproxy
*old_ns
= tsk
->nsproxy
;
84 struct nsproxy
*new_ns
;
92 if (!(flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
)))
95 new_ns
= clone_namespaces(old_ns
);
101 tsk
->nsproxy
= new_ns
;
103 err
= copy_mnt_ns(flags
, tsk
);
107 err
= copy_utsname(flags
, tsk
);
111 err
= copy_ipcs(flags
, tsk
);
115 err
= copy_pid_ns(flags
, tsk
);
125 put_ipc_ns(new_ns
->ipc_ns
);
128 put_uts_ns(new_ns
->uts_ns
);
131 put_mnt_ns(new_ns
->mnt_ns
);
133 tsk
->nsproxy
= old_ns
;
138 void free_nsproxy(struct nsproxy
*ns
)
141 put_mnt_ns(ns
->mnt_ns
);
143 put_uts_ns(ns
->uts_ns
);
145 put_ipc_ns(ns
->ipc_ns
);
147 put_pid_ns(ns
->pid_ns
);