Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 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. |
Kirill Korotaev | 25b21cb | 2006-10-02 02:18:19 -0700 | [diff] [blame] | 10 | * |
| 11 | * Jun 2006 - namespaces support |
| 12 | * OpenVZ, SWsoft Inc. |
| 13 | * Pavel Emelianov <xemul@openvz.org> |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/version.h> |
| 18 | #include <linux/nsproxy.h> |
Serge E. Hallyn | 0437eb5 | 2006-10-02 02:18:07 -0700 | [diff] [blame] | 19 | #include <linux/init_task.h> |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 20 | #include <linux/mnt_namespace.h> |
Serge E. Hallyn | 4865ecf | 2006-10-02 02:18:14 -0700 | [diff] [blame] | 21 | #include <linux/utsname.h> |
Cedric Le Goater | 9a575a9 | 2006-12-08 02:37:59 -0800 | [diff] [blame] | 22 | #include <linux/pid_namespace.h> |
Serge E. Hallyn | 0437eb5 | 2006-10-02 02:18:07 -0700 | [diff] [blame] | 23 | |
| 24 | struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 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. |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 41 | */ |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 42 | static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 43 | { |
| 44 | struct nsproxy *ns; |
| 45 | |
Alexey Dobriyan | e05d722 | 2006-10-19 23:29:12 -0700 | [diff] [blame] | 46 | ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL); |
Eric W. Biederman | 5f8442e | 2006-12-13 00:34:04 -0800 | [diff] [blame] | 47 | if (ns) |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 48 | atomic_set(&ns->count, 1); |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 49 | return ns; |
| 50 | } |
| 51 | |
| 52 | /* |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 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. |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 56 | */ |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 57 | static struct nsproxy *create_new_namespaces(int flags, struct task_struct *tsk, |
| 58 | struct fs_struct *new_fs) |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 59 | { |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 60 | struct nsproxy *new_nsp; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 61 | int err; |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 62 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 63 | new_nsp = clone_nsproxy(tsk->nsproxy); |
| 64 | if (!new_nsp) |
| 65 | return ERR_PTR(-ENOMEM); |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 66 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 67 | new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 68 | if (IS_ERR(new_nsp->mnt_ns)) { |
| 69 | err = PTR_ERR(new_nsp->mnt_ns); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 70 | goto out_ns; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 71 | } |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 72 | |
| 73 | new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 74 | if (IS_ERR(new_nsp->uts_ns)) { |
| 75 | err = PTR_ERR(new_nsp->uts_ns); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 76 | goto out_uts; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 77 | } |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 78 | |
| 79 | new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 80 | if (IS_ERR(new_nsp->ipc_ns)) { |
| 81 | err = PTR_ERR(new_nsp->ipc_ns); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 82 | goto out_ipc; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 83 | } |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 84 | |
| 85 | new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 86 | if (IS_ERR(new_nsp->pid_ns)) { |
| 87 | err = PTR_ERR(new_nsp->pid_ns); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 88 | goto out_pid; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 89 | } |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 90 | |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 91 | new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 92 | if (IS_ERR(new_nsp->user_ns)) { |
| 93 | err = PTR_ERR(new_nsp->user_ns); |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 94 | goto out_user; |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 95 | } |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 96 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 97 | return new_nsp; |
| 98 | |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 99 | out_user: |
| 100 | if (new_nsp->pid_ns) |
| 101 | put_pid_ns(new_nsp->pid_ns); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 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); |
Cedric Le Goater | 467e9f4 | 2007-07-15 23:41:06 -0700 | [diff] [blame^] | 113 | return ERR_PTR(err); |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 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; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 123 | struct nsproxy *new_ns; |
| 124 | int err = 0; |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 125 | |
| 126 | if (!old_ns) |
| 127 | return 0; |
| 128 | |
| 129 | get_nsproxy(old_ns); |
| 130 | |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 131 | if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER))) |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 132 | return 0; |
| 133 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 134 | if (!capable(CAP_SYS_ADMIN)) { |
| 135 | err = -EPERM; |
| 136 | goto out; |
| 137 | } |
| 138 | |
| 139 | new_ns = create_new_namespaces(flags, tsk, tsk->fs); |
| 140 | if (IS_ERR(new_ns)) { |
| 141 | err = PTR_ERR(new_ns); |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 142 | goto out; |
| 143 | } |
| 144 | |
| 145 | tsk->nsproxy = new_ns; |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 146 | out: |
Linus Torvalds | 444f378 | 2007-01-30 13:35:18 -0800 | [diff] [blame] | 147 | put_nsproxy(old_ns); |
Serge E. Hallyn | 1651e14 | 2006-10-02 02:18:08 -0700 | [diff] [blame] | 148 | return err; |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | void free_nsproxy(struct nsproxy *ns) |
| 152 | { |
Cedric Le Goater | 9a575a9 | 2006-12-08 02:37:59 -0800 | [diff] [blame] | 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); |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 161 | if (ns->user_ns) |
| 162 | put_user_ns(ns->user_ns); |
Cedric Le Goater | 9a575a9 | 2006-12-08 02:37:59 -0800 | [diff] [blame] | 163 | kfree(ns); |
Serge E. Hallyn | ab51601 | 2006-10-02 02:18:06 -0700 | [diff] [blame] | 164 | } |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 165 | |
| 166 | /* |
| 167 | * Called from unshare. Unshare all the namespaces part of nsproxy. |
Cedric Le Goater | 4e71e474 | 2007-06-23 17:16:25 -0700 | [diff] [blame] | 168 | * On success, returns the new nsproxy. |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 169 | */ |
| 170 | int unshare_nsproxy_namespaces(unsigned long unshare_flags, |
| 171 | struct nsproxy **new_nsp, struct fs_struct *new_fs) |
| 172 | { |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 173 | int err = 0; |
| 174 | |
Serge E. Hallyn | 77ec739 | 2007-07-15 23:41:01 -0700 | [diff] [blame] | 175 | if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
| 176 | CLONE_NEWUSER))) |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 177 | return 0; |
| 178 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 179 | if (!capable(CAP_SYS_ADMIN)) |
| 180 | return -EPERM; |
| 181 | |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 182 | *new_nsp = create_new_namespaces(unshare_flags, current, |
| 183 | new_fs ? new_fs : current->fs); |
Cedric Le Goater | 4e71e474 | 2007-06-23 17:16:25 -0700 | [diff] [blame] | 184 | if (IS_ERR(*new_nsp)) |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 185 | err = PTR_ERR(*new_nsp); |
Badari Pulavarty | e3222c4 | 2007-05-08 00:25:21 -0700 | [diff] [blame] | 186 | return err; |
| 187 | } |