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 240437eb59SSerge E. Hallyn struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); 25ab516013SSerge E. Hallyn 26ab516013SSerge E. Hallyn static inline void get_nsproxy(struct nsproxy *ns) 27ab516013SSerge E. Hallyn { 28ab516013SSerge E. Hallyn atomic_inc(&ns->count); 29ab516013SSerge E. Hallyn } 30ab516013SSerge E. Hallyn 31ab516013SSerge E. Hallyn void get_task_namespaces(struct task_struct *tsk) 32ab516013SSerge E. Hallyn { 33ab516013SSerge E. Hallyn struct nsproxy *ns = tsk->nsproxy; 34ab516013SSerge E. Hallyn if (ns) { 35ab516013SSerge E. Hallyn get_nsproxy(ns); 36ab516013SSerge E. Hallyn } 37ab516013SSerge E. Hallyn } 38ab516013SSerge E. Hallyn 39ab516013SSerge E. Hallyn /* 40ab516013SSerge E. Hallyn * creates a copy of "orig" with refcount 1. 41ab516013SSerge E. Hallyn */ 42e3222c4eSBadari Pulavarty static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig) 43ab516013SSerge E. Hallyn { 44ab516013SSerge E. Hallyn struct nsproxy *ns; 45ab516013SSerge E. Hallyn 46e05d722eSAlexey Dobriyan ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL); 475f8442edSEric W. Biederman if (ns) 48ab516013SSerge E. Hallyn atomic_set(&ns->count, 1); 49ab516013SSerge E. Hallyn return ns; 50ab516013SSerge E. Hallyn } 51ab516013SSerge E. Hallyn 52ab516013SSerge E. Hallyn /* 53e3222c4eSBadari Pulavarty * Create new nsproxy and all of its the associated namespaces. 54e3222c4eSBadari Pulavarty * Return the newly created nsproxy. Do not attach this to the task, 55e3222c4eSBadari Pulavarty * leave it to the caller to do proper locking and attach it to task. 56ab516013SSerge E. Hallyn */ 57e3222c4eSBadari Pulavarty static struct nsproxy *create_new_namespaces(int flags, struct task_struct *tsk, 58e3222c4eSBadari Pulavarty struct fs_struct *new_fs) 59ab516013SSerge E. Hallyn { 60e3222c4eSBadari Pulavarty struct nsproxy *new_nsp; 61ab516013SSerge E. Hallyn 62e3222c4eSBadari Pulavarty new_nsp = clone_nsproxy(tsk->nsproxy); 63e3222c4eSBadari Pulavarty if (!new_nsp) 64e3222c4eSBadari Pulavarty return ERR_PTR(-ENOMEM); 651651e14eSSerge E. Hallyn 66e3222c4eSBadari Pulavarty new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); 67e3222c4eSBadari Pulavarty if (IS_ERR(new_nsp->mnt_ns)) 68e3222c4eSBadari Pulavarty goto out_ns; 69e3222c4eSBadari Pulavarty 70e3222c4eSBadari Pulavarty new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); 71e3222c4eSBadari Pulavarty if (IS_ERR(new_nsp->uts_ns)) 72e3222c4eSBadari Pulavarty goto out_uts; 73e3222c4eSBadari Pulavarty 74e3222c4eSBadari Pulavarty new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); 75e3222c4eSBadari Pulavarty if (IS_ERR(new_nsp->ipc_ns)) 76e3222c4eSBadari Pulavarty goto out_ipc; 77e3222c4eSBadari Pulavarty 78e3222c4eSBadari Pulavarty new_nsp->pid_ns = copy_pid_ns(flags, tsk->nsproxy->pid_ns); 79e3222c4eSBadari Pulavarty if (IS_ERR(new_nsp->pid_ns)) 80e3222c4eSBadari Pulavarty goto out_pid; 81e3222c4eSBadari Pulavarty 82e3222c4eSBadari Pulavarty return new_nsp; 83e3222c4eSBadari Pulavarty 84e3222c4eSBadari Pulavarty out_pid: 85e3222c4eSBadari Pulavarty if (new_nsp->ipc_ns) 86e3222c4eSBadari Pulavarty put_ipc_ns(new_nsp->ipc_ns); 87e3222c4eSBadari Pulavarty out_ipc: 88e3222c4eSBadari Pulavarty if (new_nsp->uts_ns) 89e3222c4eSBadari Pulavarty put_uts_ns(new_nsp->uts_ns); 90e3222c4eSBadari Pulavarty out_uts: 91e3222c4eSBadari Pulavarty if (new_nsp->mnt_ns) 92e3222c4eSBadari Pulavarty put_mnt_ns(new_nsp->mnt_ns); 93e3222c4eSBadari Pulavarty out_ns: 94e3222c4eSBadari Pulavarty kfree(new_nsp); 95e3222c4eSBadari Pulavarty return ERR_PTR(-ENOMEM); 96ab516013SSerge E. Hallyn } 97ab516013SSerge E. Hallyn 98ab516013SSerge E. Hallyn /* 99ab516013SSerge E. Hallyn * called from clone. This now handles copy for nsproxy and all 100ab516013SSerge E. Hallyn * namespaces therein. 101ab516013SSerge E. Hallyn */ 102ab516013SSerge E. Hallyn int copy_namespaces(int flags, struct task_struct *tsk) 103ab516013SSerge E. Hallyn { 104ab516013SSerge E. Hallyn struct nsproxy *old_ns = tsk->nsproxy; 1051651e14eSSerge E. Hallyn struct nsproxy *new_ns; 1061651e14eSSerge E. Hallyn int err = 0; 107ab516013SSerge E. Hallyn 108ab516013SSerge E. Hallyn if (!old_ns) 109ab516013SSerge E. Hallyn return 0; 110ab516013SSerge E. Hallyn 111ab516013SSerge E. Hallyn get_nsproxy(old_ns); 112ab516013SSerge E. Hallyn 11325b21cb2SKirill Korotaev if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC))) 114ab516013SSerge E. Hallyn return 0; 1151651e14eSSerge E. Hallyn 116e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) { 117e3222c4eSBadari Pulavarty err = -EPERM; 118e3222c4eSBadari Pulavarty goto out; 119e3222c4eSBadari Pulavarty } 120e3222c4eSBadari Pulavarty 121e3222c4eSBadari Pulavarty new_ns = create_new_namespaces(flags, tsk, tsk->fs); 122e3222c4eSBadari Pulavarty if (IS_ERR(new_ns)) { 123e3222c4eSBadari Pulavarty err = PTR_ERR(new_ns); 1241651e14eSSerge E. Hallyn goto out; 1251651e14eSSerge E. Hallyn } 1261651e14eSSerge E. Hallyn 1271651e14eSSerge E. Hallyn tsk->nsproxy = new_ns; 1281651e14eSSerge E. Hallyn out: 129444f378bSLinus Torvalds put_nsproxy(old_ns); 1301651e14eSSerge E. Hallyn return err; 131ab516013SSerge E. Hallyn } 132ab516013SSerge E. Hallyn 133ab516013SSerge E. Hallyn void free_nsproxy(struct nsproxy *ns) 134ab516013SSerge E. Hallyn { 1356b3286edSKirill Korotaev if (ns->mnt_ns) 1366b3286edSKirill Korotaev put_mnt_ns(ns->mnt_ns); 1374865ecf1SSerge E. Hallyn if (ns->uts_ns) 1384865ecf1SSerge E. Hallyn put_uts_ns(ns->uts_ns); 13925b21cb2SKirill Korotaev if (ns->ipc_ns) 14025b21cb2SKirill Korotaev put_ipc_ns(ns->ipc_ns); 1419a575a92SCedric Le Goater if (ns->pid_ns) 1429a575a92SCedric Le Goater put_pid_ns(ns->pid_ns); 143ab516013SSerge E. Hallyn kfree(ns); 144ab516013SSerge E. Hallyn } 145e3222c4eSBadari Pulavarty 146e3222c4eSBadari Pulavarty /* 147e3222c4eSBadari Pulavarty * Called from unshare. Unshare all the namespaces part of nsproxy. 1484e71e474SCedric Le Goater * On success, returns the new nsproxy. 149e3222c4eSBadari Pulavarty */ 150e3222c4eSBadari Pulavarty int unshare_nsproxy_namespaces(unsigned long unshare_flags, 151e3222c4eSBadari Pulavarty struct nsproxy **new_nsp, struct fs_struct *new_fs) 152e3222c4eSBadari Pulavarty { 153e3222c4eSBadari Pulavarty int err = 0; 154e3222c4eSBadari Pulavarty 155e3222c4eSBadari Pulavarty if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC))) 156e3222c4eSBadari Pulavarty return 0; 157e3222c4eSBadari Pulavarty 158e3222c4eSBadari Pulavarty #ifndef CONFIG_IPC_NS 159e3222c4eSBadari Pulavarty if (unshare_flags & CLONE_NEWIPC) 160e3222c4eSBadari Pulavarty return -EINVAL; 161e3222c4eSBadari Pulavarty #endif 162e3222c4eSBadari Pulavarty 163e3222c4eSBadari Pulavarty #ifndef CONFIG_UTS_NS 164e3222c4eSBadari Pulavarty if (unshare_flags & CLONE_NEWUTS) 165e3222c4eSBadari Pulavarty return -EINVAL; 166e3222c4eSBadari Pulavarty #endif 167e3222c4eSBadari Pulavarty 168e3222c4eSBadari Pulavarty if (!capable(CAP_SYS_ADMIN)) 169e3222c4eSBadari Pulavarty return -EPERM; 170e3222c4eSBadari Pulavarty 171e3222c4eSBadari Pulavarty *new_nsp = create_new_namespaces(unshare_flags, current, 172e3222c4eSBadari Pulavarty new_fs ? new_fs : current->fs); 1734e71e474SCedric Le Goater if (IS_ERR(*new_nsp)) 174e3222c4eSBadari Pulavarty err = PTR_ERR(*new_nsp); 175e3222c4eSBadari Pulavarty return err; 176e3222c4eSBadari Pulavarty } 177