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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - kernel/nsproxy.c
10f0bbba382bed8c37d498cd55cf5871eb9b8bd4
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 static struct kmem_cache
*nsproxy_cachep
;
26 struct nsproxy init_nsproxy
= INIT_NSPROXY(init_nsproxy
);
28 static inline void get_nsproxy(struct nsproxy
*ns
)
30 atomic_inc(&ns
->count
);
33 void get_task_namespaces(struct task_struct
*tsk
)
35 struct nsproxy
*ns
= tsk
->nsproxy
;
42 * creates a copy of "orig" with refcount 1.
44 static inline struct nsproxy
*clone_nsproxy(struct nsproxy
*orig
)
48 ns
= kmem_cache_alloc(nsproxy_cachep
, GFP_KERNEL
);
50 memcpy(ns
, orig
, sizeof(struct nsproxy
));
51 atomic_set(&ns
->count
, 1);
57 * Create new nsproxy and all of its the associated namespaces.
58 * Return the newly created nsproxy. Do not attach this to the task,
59 * leave it to the caller to do proper locking and attach it to task.
61 static struct nsproxy
*create_new_namespaces(unsigned long flags
,
62 struct task_struct
*tsk
, struct fs_struct
*new_fs
)
64 struct nsproxy
*new_nsp
;
67 new_nsp
= clone_nsproxy(tsk
->nsproxy
);
69 return ERR_PTR(-ENOMEM
);
71 new_nsp
->mnt_ns
= copy_mnt_ns(flags
, tsk
->nsproxy
->mnt_ns
, new_fs
);
72 if (IS_ERR(new_nsp
->mnt_ns
)) {
73 err
= PTR_ERR(new_nsp
->mnt_ns
);
77 new_nsp
->uts_ns
= copy_utsname(flags
, tsk
->nsproxy
->uts_ns
);
78 if (IS_ERR(new_nsp
->uts_ns
)) {
79 err
= PTR_ERR(new_nsp
->uts_ns
);
83 new_nsp
->ipc_ns
= copy_ipcs(flags
, tsk
->nsproxy
->ipc_ns
);
84 if (IS_ERR(new_nsp
->ipc_ns
)) {
85 err
= PTR_ERR(new_nsp
->ipc_ns
);
89 new_nsp
->pid_ns
= copy_pid_ns(flags
, tsk
->nsproxy
->pid_ns
);
90 if (IS_ERR(new_nsp
->pid_ns
)) {
91 err
= PTR_ERR(new_nsp
->pid_ns
);
95 new_nsp
->user_ns
= copy_user_ns(flags
, tsk
->nsproxy
->user_ns
);
96 if (IS_ERR(new_nsp
->user_ns
)) {
97 err
= PTR_ERR(new_nsp
->user_ns
);
105 put_pid_ns(new_nsp
->pid_ns
);
108 put_ipc_ns(new_nsp
->ipc_ns
);
111 put_uts_ns(new_nsp
->uts_ns
);
114 put_mnt_ns(new_nsp
->mnt_ns
);
116 kmem_cache_free(nsproxy_cachep
, new_nsp
);
121 * called from clone. This now handles copy for nsproxy and all
122 * namespaces therein.
124 int copy_namespaces(unsigned long flags
, struct task_struct
*tsk
)
126 struct nsproxy
*old_ns
= tsk
->nsproxy
;
127 struct nsproxy
*new_ns
;
135 if (!(flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
| CLONE_NEWUSER
)))
138 if (!capable(CAP_SYS_ADMIN
)) {
143 new_ns
= create_new_namespaces(flags
, tsk
, tsk
->fs
);
144 if (IS_ERR(new_ns
)) {
145 err
= PTR_ERR(new_ns
);
149 tsk
->nsproxy
= new_ns
;
155 void free_nsproxy(struct nsproxy
*ns
)
158 put_mnt_ns(ns
->mnt_ns
);
160 put_uts_ns(ns
->uts_ns
);
162 put_ipc_ns(ns
->ipc_ns
);
164 put_pid_ns(ns
->pid_ns
);
166 put_user_ns(ns
->user_ns
);
167 kmem_cache_free(nsproxy_cachep
, ns
);
171 * Called from unshare. Unshare all the namespaces part of nsproxy.
172 * On success, returns the new nsproxy.
174 int unshare_nsproxy_namespaces(unsigned long unshare_flags
,
175 struct nsproxy
**new_nsp
, struct fs_struct
*new_fs
)
179 if (!(unshare_flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
|
183 if (!capable(CAP_SYS_ADMIN
))
186 *new_nsp
= create_new_namespaces(unshare_flags
, current
,
187 new_fs
? new_fs
: current
->fs
);
188 if (IS_ERR(*new_nsp
))
189 err
= PTR_ERR(*new_nsp
);
193 static int __init
nsproxy_cache_init(void)
195 nsproxy_cachep
= kmem_cache_create("nsproxy", sizeof(struct nsproxy
),
196 0, SLAB_PANIC
, NULL
, NULL
);
200 module_init(nsproxy_cache_init
);