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> 239dd776b6SEric W. Biederman #include <net/net_namespace.h> 240437eb59SSerge E. Hallyn 2598c0d07cSCedric Le Goater static struct kmem_cache *nsproxy_cachep; 2698c0d07cSCedric Le Goater 270437eb59SSerge E. Hallyn struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); 28ab516013SSerge E. Hallyn 29ab516013SSerge E. Hallyn static inline void get_nsproxy(struct nsproxy *ns) 30ab516013SSerge E. Hallyn { 31ab516013SSerge E. Hallyn atomic_inc(&ns->count); 32ab516013SSerge E. Hallyn } 33ab516013SSerge E. Hallyn 34ab516013SSerge E. Hallyn void get_task_namespaces(struct task_struct *tsk) 35ab516013SSerge E. Hallyn { 36ab516013SSerge E. Hallyn struct nsproxy *ns = tsk->nsproxy; 37ab516013SSerge E. Hallyn if (ns) { 38ab516013SSerge E. Hallyn get_nsproxy(ns); 39ab516013SSerge E. Hallyn } 40ab516013SSerge E. Hallyn } 41ab516013SSerge E. Hallyn 42ab516013SSerge E. Hallyn /* 43ab516013SSerge E. Hallyn * creates a copy of "orig" with refcount 1. 44ab516013SSerge E. Hallyn */ 45e3222c4eSBadari Pulavarty static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) 46ab516013SSerge E. Hallyn { 47ab516013SSerge E. Hallyn struct nsproxy *ns; 48ab516013SSerge E. Hallyn 4998c0d07cSCedric Le Goater ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL); 5098c0d07cSCedric Le Goater if (ns) { 5198c0d07cSCedric Le Goater memcpy(ns, orig, sizeof(struct nsproxy)); 52ab516013SSerge E. Hallyn atomic_set(&ns->count, 1); 5398c0d07cSCedric Le Goater } 54ab516013SSerge E. Hallyn return ns; 55ab516013SSerge E. Hallyn } 56ab516013SSerge E. Hallyn 57ab516013SSerge E. Hallyn /* 58e3222c4eSBadari Pulavarty * Create new nsproxy and all of its the associated namespaces. 59e3222c4eSBadari Pulavarty * Return the newly created nsproxy. Do not attach this to the task, 60e3222c4eSBadari Pulavarty * leave it to the caller to do proper locking and attach it to task. 61ab516013SSerge E. Hallyn */ 62213dd266SEric W. Biederman static struct nsproxy *create_new_namespaces(unsigned long flags, 63213dd266SEric W. Biederman struct task_struct *tsk, struct fs_struct *new_fs) 64ab516013SSerge E. Hallyn { 65e3222c4eSBadari Pulavarty struct nsproxy *new_nsp; 66467e9f4bSCedric Le Goater int err; 67ab516013SSerge E. Hallyn 68e3222c4eSBadari Pulavarty new_nsp = clone_nsproxy(tsk->nsproxy); 69e3222c4eSBadari Pulavarty if (!new_nsp) 70e3222c4eSBadari Pulavarty return ERR_PTR(-ENOMEM); 711651e14eSSerge E. Hallyn 72e3222c4eSBadari Pulavarty new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); 73467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->mnt_ns)) { 74467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->mnt_ns); 75e3222c4eSBadari Pulavarty goto out_ns; 76467e9f4bSCedric Le Goater } 77e3222c4eSBadari Pulavarty 78e3222c4eSBadari Pulavarty new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); 79467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->uts_ns)) { 80467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->uts_ns); 81e3222c4eSBadari Pulavarty goto out_uts; 82467e9f4bSCedric Le Goater } 83e3222c4eSBadari Pulavarty 84e3222c4eSBadari Pulavarty new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); 85467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->ipc_ns)) { 86467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->ipc_ns); 87e3222c4eSBadari Pulavarty goto out_ipc; 88467e9f4bSCedric Le Goater } 89e3222c4eSBadari Pulavarty 90e3222c4eSBadari Pulavarty new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); 91467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->pid_ns)) { 92467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->pid_ns); 93e3222c4eSBadari Pulavarty goto out_pid; 94467e9f4bSCedric Le Goater } 95e3222c4eSBadari Pulavarty 96acce292cSCedric Le Goater new_nsp->user_ns = copy_user_ns(flags, tsk->nsproxy->user_ns); 97467e9f4bSCedric Le Goater if (IS_ERR(new_nsp->user_ns)) { 98467e9f4bSCedric Le Goater err = PTR_ERR(new_nsp->user_ns); 99acce292cSCedric Le Goater goto out_user; 100467e9f4bSCedric Le Goater } 101acce292cSCedric Le Goater 1029dd776b6SEric W. Biederman new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns); 1039dd776b6SEric W. Biederman if (IS_ERR(new_nsp->net_ns)) { 1049dd776b6SEric W. Biederman err = PTR_ERR(new_nsp->net_ns); 1059dd776b6SEric W. Biederman goto out_net; 1069dd776b6SEric W. Biederman } 1079dd776b6SEric W. Biederman 108e3222c4eSBadari Pulavarty return new_nsp; 109e3222c4eSBadari Pulavarty 1109dd776b6SEric W. Biederman out_net: 1119dd776b6SEric W. Biederman if (new_nsp->user_ns) 1129dd776b6SEric W. Biederman put_user_ns(new_nsp->user_ns); 113acce292cSCedric Le Goater out_user: 114acce292cSCedric Le Goater if (new_nsp->pid_ns) 115acce292cSCedric Le Goater put_pid_ns(new_nsp->pid_ns); 116e3222c4eSBadari Pulavarty out_pid: 117e3222c4eSBadari Pulavarty if (new_nsp->ipc_ns) 118e3222c4eSBadari Pulavarty put_ipc_ns(new_nsp->ipc_ns); 119e3222c4eSBadari Pulavarty out_ipc: 120e3222c4eSBadari Pulavarty if (new_nsp->uts_ns) 121e3222c4eSBadari Pulavarty put_uts_ns(new_nsp->uts_ns); 122e3222c4eSBadari Pulavarty out_uts: 123e3222c4eSBadari Pulavarty if (new_nsp->mnt_ns) 124e3222c4eSBadari Pulavarty put_mnt_ns(new_nsp->mnt_ns); 125e3222c4eSBadari Pulavarty out_ns: 12698c0d07cSCedric Le Goater kmem_cache_free(nsproxy_cachep, new_nsp); 127467e9f4bSCedric Le Goater return ERR_PTR(err); 128ab516013SSerge E. Hallyn } 129ab516013SSerge E. Hallyn 130ab516013SSerge E. Hallyn /* 131ab516013SSerge E. Hallyn * called from clone. This now handles copy for nsproxy and all 132ab516013SSerge E. Hallyn * namespaces therein. 133ab516013SSerge E. Hallyn */ 134213dd266SEric W. Biederman int copy_namespaces(unsigned long flags, struct task_struct *tsk) 135ab516013SSerge E. Hallyn { 136ab516013SSerge E. Hallyn struct nsproxy *old_ns = tsk->nsproxy; 1371651e14eSSerge E. Hallyn struct nsproxy *new_ns; 1381651e14eSSerge E. Hallyn int err = 0; 139ab516013SSerge E. Hallyn 140ab516013SSerge E. Hallyn if (!old_ns) 141ab516013SSerge E. Hallyn return 0; 142ab516013SSerge E. Hallyn 143ab516013SSerge E. Hallyn get_nsproxy(old_ns); 144ab516013SSerge E. Hallyn 1459dd776b6SEric W. Biederman if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER | CLONE_NEWNET))) 146ab516013SSerge E. Hallyn return 0; 1471651e14eSSerge E. Hallyn 148e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) { 149e3222c4eSBadari Pulavarty err = -EPERM; 150e3222c4eSBadari Pulavarty goto out; 151e3222c4eSBadari Pulavarty } 152e3222c4eSBadari Pulavarty 153e3222c4eSBadari Pulavarty new_ns = create_new_namespaces(flags, tsk, tsk->fs); 154e3222c4eSBadari Pulavarty if (IS_ERR(new_ns)) { 155e3222c4eSBadari Pulavarty err = PTR_ERR(new_ns); 1561651e14eSSerge E. Hallyn goto out; 1571651e14eSSerge E. Hallyn } 1581651e14eSSerge E. Hallyn 1591651e14eSSerge E. Hallyn tsk->nsproxy = new_ns; 1601651e14eSSerge E. Hallyn out: 161444f378bSLinus Torvalds put_nsproxy(old_ns); 1621651e14eSSerge E. Hallyn return err; 163ab516013SSerge E. Hallyn } 164ab516013SSerge E. Hallyn 165ab516013SSerge E. Hallyn void free_nsproxy(struct nsproxy *ns) 166ab516013SSerge E. Hallyn { 1676b3286edSKirill Korotaev if (ns->mnt_ns) 1686b3286edSKirill Korotaev put_mnt_ns(ns->mnt_ns); 1694865ecf1SSerge E. Hallyn if (ns->uts_ns) 1704865ecf1SSerge E. Hallyn put_uts_ns(ns->uts_ns); 17125b21cb2SKirill Korotaev if (ns->ipc_ns) 17225b21cb2SKirill Korotaev put_ipc_ns(ns->ipc_ns); 1739a575a92SCedric Le Goater if (ns->pid_ns) 1749a575a92SCedric Le Goater put_pid_ns(ns->pid_ns); 175acce292cSCedric Le Goater if (ns->user_ns) 176acce292cSCedric Le Goater put_user_ns(ns->user_ns); 1779dd776b6SEric W. Biederman put_net(ns->net_ns); 17898c0d07cSCedric Le Goater kmem_cache_free(nsproxy_cachep, ns); 179ab516013SSerge E. Hallyn } 180e3222c4eSBadari Pulavarty 181e3222c4eSBadari Pulavarty /* 182e3222c4eSBadari Pulavarty * Called from unshare. Unshare all the namespaces part of nsproxy. 1834e71e474SCedric Le Goater * On success, returns the new nsproxy. 184e3222c4eSBadari Pulavarty */ 185e3222c4eSBadari Pulavarty int unshare_nsproxy_namespaces(unsigned long unshare_flags, 186e3222c4eSBadari Pulavarty struct nsproxy **new_nsp, struct fs_struct *new_fs) 187e3222c4eSBadari Pulavarty { 188e3222c4eSBadari Pulavarty int err = 0; 189e3222c4eSBadari Pulavarty 19077ec739dSSerge E. Hallyn if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | 1919dd776b6SEric W. Biederman CLONE_NEWUSER | CLONE_NEWNET))) 192e3222c4eSBadari Pulavarty return 0; 193e3222c4eSBadari Pulavarty 194e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) 195e3222c4eSBadari Pulavarty return -EPERM; 196e3222c4eSBadari Pulavarty 197e3222c4eSBadari Pulavarty *new_nsp = create_new_namespaces(unshare_flags, current, 198e3222c4eSBadari Pulavarty new_fs ? new_fs : current->fs); 1994e71e474SCedric Le Goater if (IS_ERR(*new_nsp)) 200e3222c4eSBadari Pulavarty err = PTR_ERR(*new_nsp); 201e3222c4eSBadari Pulavarty return err; 202e3222c4eSBadari Pulavarty } 20398c0d07cSCedric Le Goater 20498c0d07cSCedric Le Goater static int __init nsproxy_cache_init(void) 20598c0d07cSCedric Le Goater { 206db8906daSPavel Emelyanov nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC); 20798c0d07cSCedric Le Goater return 0; 20898c0d07cSCedric Le Goater } 20998c0d07cSCedric Le Goater 21098c0d07cSCedric Le Goater module_init(nsproxy_cache_init); 211