1ab516013SSerge E. Hallyn /* 2ab516013SSerge E. Hallyn * Copyright (C) 2006 IBM Corporation 3ab516013SSerge E. Hallyn * 4ab516013SSerge E. Hallyn * Author: Serge Hallyn <serue@us.ibm.com> 5ab516013SSerge E. Hallyn * 6ab516013SSerge E. Hallyn * This program is free software; you can redistribute it and/or 7ab516013SSerge E. Hallyn * modify it under the terms of the GNU General Public License as 8ab516013SSerge E. Hallyn * published by the Free Software Foundation, version 2 of the 9ab516013SSerge E. Hallyn * License. 1025b21cb2SKirill Korotaev * 1125b21cb2SKirill Korotaev * Jun 2006 - namespaces support 1225b21cb2SKirill Korotaev * OpenVZ, SWsoft Inc. 1325b21cb2SKirill Korotaev * Pavel Emelianov <xemul@openvz.org> 14ab516013SSerge E. Hallyn */ 15ab516013SSerge E. Hallyn 16ab516013SSerge E. Hallyn #include <linux/module.h> 17ab516013SSerge E. Hallyn #include <linux/version.h> 18ab516013SSerge E. Hallyn #include <linux/nsproxy.h> 190437eb59SSerge E. Hallyn #include <linux/init_task.h> 206b3286edSKirill Korotaev #include <linux/mnt_namespace.h> 214865ecf1SSerge E. Hallyn #include <linux/utsname.h> 229a575a92SCedric Le Goater #include <linux/pid_namespace.h> 230437eb59SSerge E. Hallyn 2498c0d07cSCedric Le Goater static struct kmem_cache *nsproxy_cachep; 2598c0d07cSCedric Le Goater 260437eb59SSerge E. Hallyn struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); 27ab516013SSerge E. Hallyn 28ab516013SSerge E. Hallyn static inline void get_nsproxy(struct nsproxy *ns) 29ab516013SSerge E. Hallyn { 30ab516013SSerge E. Hallyn atomic_inc(&ns->count); 31ab516013SSerge E. Hallyn } 32ab516013SSerge E. Hallyn 33ab516013SSerge E. Hallyn void get_task_namespaces(struct task_struct *tsk) 34ab516013SSerge E. Hallyn { 35ab516013SSerge E. Hallyn struct nsproxy *ns = tsk->nsproxy; 36ab516013SSerge E. Hallyn if (ns) { 37ab516013SSerge E. Hallyn get_nsproxy(ns); 38ab516013SSerge E. Hallyn } 39ab516013SSerge E. Hallyn } 40ab516013SSerge E. Hallyn 41ab516013SSerge E. Hallyn /* 42ab516013SSerge E. Hallyn * creates a copy of "orig" with refcount 1. 43ab516013SSerge E. Hallyn */ 44e3222c4eSBadari Pulavarty static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) 45ab516013SSerge E. Hallyn { 46ab516013SSerge E. Hallyn struct nsproxy *ns; 47ab516013SSerge E. Hallyn 4898c0d07cSCedric Le Goater ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL); 4998c0d07cSCedric Le Goater if (ns) { 5098c0d07cSCedric Le Goater memcpy(ns, orig, sizeof(struct nsproxy)); 51ab516013SSerge E. Hallyn atomic_set(&ns->count, 1); 5298c0d07cSCedric Le Goater } 53ab516013SSerge E. Hallyn return ns; 54ab516013SSerge E. Hallyn } 55ab516013SSerge E. Hallyn 56ab516013SSerge E. Hallyn /* 57e3222c4eSBadari Pulavarty * Create new nsproxy and all of its the associated namespaces. 58e3222c4eSBadari Pulavarty * Return the newly created nsproxy. Do not attach this to the task, 59e3222c4eSBadari Pulavarty * leave it to the caller to do proper locking and attach it to task. 60ab516013SSerge E. Hallyn */ 61213dd266SEric W. Biederman static struct nsproxy *create_new_namespaces(unsigned long flags, 62213dd266SEric W. Biederman struct task_struct *tsk, struct fs_struct *new_fs) 63ab516013SSerge E. Hallyn { 64e3222c4eSBadari Pulavarty struct nsproxy *new_nsp; 65467e9f4bSCedric Le Goater int err; 66ab516013SSerge E. Hallyn 67e3222c4eSBadari Pulavarty new_nsp = clone_nsproxy(tsk->nsproxy); 68e3222c4eSBadari Pulavarty if (!new_nsp) 69e3222c4eSBadari Pulavarty return ERR_PTR(-ENOMEM); 701651e14eSSerge E. Hallyn 71e3222c4eSBadari Pulavarty new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); 72467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->mnt_ns)) { 73467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->mnt_ns); 74e3222c4eSBadari Pulavarty goto out_ns; 75467e9f4bSCedric Le Goater } 76e3222c4eSBadari Pulavarty 77e3222c4eSBadari Pulavarty new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); 78467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->uts_ns)) { 79467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->uts_ns); 80e3222c4eSBadari Pulavarty goto out_uts; 81467e9f4bSCedric Le Goater } 82e3222c4eSBadari Pulavarty 83e3222c4eSBadari Pulavarty new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); 84467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->ipc_ns)) { 85467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->ipc_ns); 86e3222c4eSBadari Pulavarty goto out_ipc; 87467e9f4bSCedric Le Goater } 88e3222c4eSBadari Pulavarty 89e3222c4eSBadari Pulavarty new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); 90467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->pid_ns)) { 91467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->pid_ns); 92e3222c4eSBadari Pulavarty goto out_pid; 93467e9f4bSCedric Le Goater } 94e3222c4eSBadari Pulavarty 95acce292cSCedric Le Goater new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns); 96467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->user_ns)) { 97467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->user_ns); 98acce292cSCedric Le Goater goto out_user; 99467e9f4bSCedric Le Goater } 100acce292cSCedric Le Goater 101e3222c4eSBadari Pulavarty return new_nsp; 102e3222c4eSBadari Pulavarty 103acce292cSCedric Le Goater out_user: 104acce292cSCedric Le Goater if (new_nsp->pid_ns) 105acce292cSCedric Le Goater put_pid_ns(new_nsp->pid_ns); 106e3222c4eSBadari Pulavarty out_pid: 107e3222c4eSBadari Pulavarty if (new_nsp->ipc_ns) 108e3222c4eSBadari Pulavarty put_ipc_ns(new_nsp->ipc_ns); 109e3222c4eSBadari Pulavarty out_ipc: 110e3222c4eSBadari Pulavarty if (new_nsp->uts_ns) 111e3222c4eSBadari Pulavarty put_uts_ns(new_nsp->uts_ns); 112e3222c4eSBadari Pulavarty out_uts: 113e3222c4eSBadari Pulavarty if (new_nsp->mnt_ns) 114e3222c4eSBadari Pulavarty put_mnt_ns(new_nsp->mnt_ns); 115e3222c4eSBadari Pulavarty out_ns: 11698c0d07cSCedric Le Goater kmem_cache_free(nsproxy_cachep, new_nsp); 117467e9f4bSCedric Le Goater return ERR_PTR(err); 118ab516013SSerge E. Hallyn } 119ab516013SSerge E. Hallyn 120ab516013SSerge E. Hallyn /* 121ab516013SSerge E. Hallyn * called from clone. This now handles copy for nsproxy and all 122ab516013SSerge E. Hallyn * namespaces therein. 123ab516013SSerge E. Hallyn */ 124213dd266SEric W. Biederman int copy_namespaces(unsigned long flags, struct task_struct *tsk) 125ab516013SSerge E. Hallyn { 126ab516013SSerge E. Hallyn struct nsproxy *old_ns = tsk->nsproxy; 1271651e14eSSerge E. Hallyn struct nsproxy *new_ns; 1281651e14eSSerge E. Hallyn int err = 0; 129ab516013SSerge E. Hallyn 130ab516013SSerge E. Hallyn if (!old_ns) 131ab516013SSerge E. Hallyn return 0; 132ab516013SSerge E. Hallyn 133ab516013SSerge E. Hallyn get_nsproxy(old_ns); 134ab516013SSerge E. Hallyn 13577ec739dSSerge E. Hallyn if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER))) 136ab516013SSerge E. Hallyn return 0; 1371651e14eSSerge E. Hallyn 138e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) { 139e3222c4eSBadari Pulavarty err = -EPERM; 140e3222c4eSBadari Pulavarty goto out; 141e3222c4eSBadari Pulavarty } 142e3222c4eSBadari Pulavarty 143e3222c4eSBadari Pulavarty new_ns = create_new_namespaces(flags, tsk, tsk->fs); 144e3222c4eSBadari Pulavarty if (IS_ERR(new_ns)) { 145e3222c4eSBadari Pulavarty err = PTR_ERR(new_ns); 1461651e14eSSerge E. Hallyn goto out; 1471651e14eSSerge E. Hallyn } 1481651e14eSSerge E. Hallyn 1491651e14eSSerge E. Hallyn tsk->nsproxy = new_ns; 1501651e14eSSerge E. Hallyn out: 151444f378bSLinus Torvalds put_nsproxy(old_ns); 1521651e14eSSerge E. Hallyn return err; 153ab516013SSerge E. Hallyn } 154ab516013SSerge E. Hallyn 155ab516013SSerge E. Hallyn void free_nsproxy(struct nsproxy *ns) 156ab516013SSerge E. Hallyn { 1576b3286edSKirill Korotaev if (ns->mnt_ns) 1586b3286edSKirill Korotaev put_mnt_ns(ns->mnt_ns); 1594865ecf1SSerge E. Hallyn if (ns->uts_ns) 1604865ecf1SSerge E. Hallyn put_uts_ns(ns->uts_ns); 16125b21cb2SKirill Korotaev if (ns->ipc_ns) 16225b21cb2SKirill Korotaev put_ipc_ns(ns->ipc_ns); 1639a575a92SCedric Le Goater if (ns->pid_ns) 1649a575a92SCedric Le Goater put_pid_ns(ns->pid_ns); 165acce292cSCedric Le Goater if (ns->user_ns) 166acce292cSCedric Le Goater put_user_ns(ns->user_ns); 16798c0d07cSCedric Le Goater kmem_cache_free(nsproxy_cachep, ns); 168ab516013SSerge E. Hallyn } 169e3222c4eSBadari Pulavarty 170e3222c4eSBadari Pulavarty /* 171e3222c4eSBadari Pulavarty * Called from unshare. Unshare all the namespaces part of nsproxy. 1724e71e474SCedric Le Goater * On success, returns the new nsproxy. 173e3222c4eSBadari Pulavarty */ 174e3222c4eSBadari Pulavarty int unshare_nsproxy_namespaces(unsigned long unshare_flags, 175e3222c4eSBadari Pulavarty struct nsproxy **new_nsp, struct fs_struct *new_fs) 176e3222c4eSBadari Pulavarty { 177e3222c4eSBadari Pulavarty int err = 0; 178e3222c4eSBadari Pulavarty 17977ec739dSSerge E. Hallyn if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | 18077ec739dSSerge E. Hallyn CLONE_NEWUSER))) 181e3222c4eSBadari Pulavarty return 0; 182e3222c4eSBadari Pulavarty 183e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) 184e3222c4eSBadari Pulavarty return -EPERM; 185e3222c4eSBadari Pulavarty 186e3222c4eSBadari Pulavarty *new_nsp = create_new_namespaces(unshare_flags, current, 187e3222c4eSBadari Pulavarty new_fs ? new_fs : current->fs); 1884e71e474SCedric Le Goater if (IS_ERR(*new_nsp)) 189e3222c4eSBadari Pulavarty err = PTR_ERR(*new_nsp); 190e3222c4eSBadari Pulavarty return err; 191e3222c4eSBadari Pulavarty } 19298c0d07cSCedric Le Goater 19398c0d07cSCedric Le Goater static int __init nsproxy_cache_init(void) 19498c0d07cSCedric Le Goater { 19598c0d07cSCedric Le Goater nsproxy_cachep = kmem_cache_create("nsproxy", sizeof(struct nsproxy), 19698c0d07cSCedric Le Goater 0, SLAB_PANIC, NULL, NULL); 19798c0d07cSCedric Le Goater return 0; 19898c0d07cSCedric Le Goater } 19998c0d07cSCedric Le Goater 20098c0d07cSCedric Le Goater module_init(nsproxy_cache_init); 201