Blame view
kernel/nsproxy.c
5.26 KB
ab516013a [PATCH] namespace... |
1 2 3 4 5 6 7 8 9 |
/* * Copyright (C) 2006 IBM Corporation * * Author: Serge Hallyn <serue@us.ibm.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. |
25b21cb2f [PATCH] IPC names... |
10 11 12 13 |
* * Jun 2006 - namespaces support * OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
ab516013a [PATCH] namespace... |
14 |
*/ |
5a0e3ad6a include cleanup: ... |
15 |
#include <linux/slab.h> |
ab516013a [PATCH] namespace... |
16 |
#include <linux/module.h> |
ab516013a [PATCH] namespace... |
17 |
#include <linux/nsproxy.h> |
0437eb594 [PATCH] nsproxy: ... |
18 |
#include <linux/init_task.h> |
6b3286ed1 [PATCH] rename st... |
19 |
#include <linux/mnt_namespace.h> |
4865ecf13 [PATCH] namespace... |
20 |
#include <linux/utsname.h> |
9a575a92d [PATCH] to nsproxy |
21 |
#include <linux/pid_namespace.h> |
9dd776b6d [NET]: Add networ... |
22 |
#include <net/net_namespace.h> |
ae5e1b22f namespaces: move ... |
23 |
#include <linux/ipc_namespace.h> |
0437eb594 [PATCH] nsproxy: ... |
24 |
|
98c0d07cb add a kmem_cache ... |
25 |
static struct kmem_cache *nsproxy_cachep; |
8467005da nsproxy: remove I... |
26 27 28 29 30 31 32 33 34 35 36 37 |
struct nsproxy init_nsproxy = { .count = ATOMIC_INIT(1), .uts_ns = &init_uts_ns, #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC) .ipc_ns = &init_ipc_ns, #endif .mnt_ns = NULL, .pid_ns = &init_pid_ns, #ifdef CONFIG_NET .net_ns = &init_net, #endif }; |
ab516013a [PATCH] namespace... |
38 |
|
90af90d7d nsproxy: extract ... |
39 |
static inline struct nsproxy *create_nsproxy(void) |
ab516013a [PATCH] namespace... |
40 |
{ |
90af90d7d nsproxy: extract ... |
41 |
struct nsproxy *nsproxy; |
ab516013a [PATCH] namespace... |
42 |
|
90af90d7d nsproxy: extract ... |
43 44 45 46 |
nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL); if (nsproxy) atomic_set(&nsproxy->count, 1); return nsproxy; |
ab516013a [PATCH] namespace... |
47 48 49 |
} /* |
e3222c4ec Merge sys_clone()... |
50 51 52 |
* Create new nsproxy and all of its the associated namespaces. * Return the newly created nsproxy. Do not attach this to the task, * leave it to the caller to do proper locking and attach it to task. |
ab516013a [PATCH] namespace... |
53 |
*/ |
213dd266d namespace: ensure... |
54 55 |
static struct nsproxy *create_new_namespaces(unsigned long flags, struct task_struct *tsk, struct fs_struct *new_fs) |
ab516013a [PATCH] namespace... |
56 |
{ |
e3222c4ec Merge sys_clone()... |
57 |
struct nsproxy *new_nsp; |
467e9f4b5 fix create_new_na... |
58 |
int err; |
ab516013a [PATCH] namespace... |
59 |
|
90af90d7d nsproxy: extract ... |
60 |
new_nsp = create_nsproxy(); |
e3222c4ec Merge sys_clone()... |
61 62 |
if (!new_nsp) return ERR_PTR(-ENOMEM); |
1651e14e2 [PATCH] namespace... |
63 |
|
e3222c4ec Merge sys_clone()... |
64 |
new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, new_fs); |
467e9f4b5 fix create_new_na... |
65 66 |
if (IS_ERR(new_nsp->mnt_ns)) { err = PTR_ERR(new_nsp->mnt_ns); |
e3222c4ec Merge sys_clone()... |
67 |
goto out_ns; |
467e9f4b5 fix create_new_na... |
68 |
} |
e3222c4ec Merge sys_clone()... |
69 70 |
new_nsp->uts_ns = copy_utsname(flags, tsk->nsproxy->uts_ns); |
467e9f4b5 fix create_new_na... |
71 72 |
if (IS_ERR(new_nsp->uts_ns)) { err = PTR_ERR(new_nsp->uts_ns); |
e3222c4ec Merge sys_clone()... |
73 |
goto out_uts; |
467e9f4b5 fix create_new_na... |
74 |
} |
e3222c4ec Merge sys_clone()... |
75 76 |
new_nsp->ipc_ns = copy_ipcs(flags, tsk->nsproxy->ipc_ns); |
467e9f4b5 fix create_new_na... |
77 78 |
if (IS_ERR(new_nsp->ipc_ns)) { err = PTR_ERR(new_nsp->ipc_ns); |
e3222c4ec Merge sys_clone()... |
79 |
goto out_ipc; |
467e9f4b5 fix create_new_na... |
80 |
} |
e3222c4ec Merge sys_clone()... |
81 |
|
2894d650c pid namespaces: d... |
82 |
new_nsp->pid_ns = copy_pid_ns(flags, task_active_pid_ns(tsk)); |
467e9f4b5 fix create_new_na... |
83 84 |
if (IS_ERR(new_nsp->pid_ns)) { err = PTR_ERR(new_nsp->pid_ns); |
e3222c4ec Merge sys_clone()... |
85 |
goto out_pid; |
467e9f4b5 fix create_new_na... |
86 |
} |
e3222c4ec Merge sys_clone()... |
87 |
|
9dd776b6d [NET]: Add networ... |
88 89 90 91 92 |
new_nsp->net_ns = copy_net_ns(flags, tsk->nsproxy->net_ns); if (IS_ERR(new_nsp->net_ns)) { err = PTR_ERR(new_nsp->net_ns); goto out_net; } |
e3222c4ec Merge sys_clone()... |
93 |
return new_nsp; |
9dd776b6d [NET]: Add networ... |
94 |
out_net: |
acce292c8 user namespace: a... |
95 96 |
if (new_nsp->pid_ns) put_pid_ns(new_nsp->pid_ns); |
e3222c4ec Merge sys_clone()... |
97 98 99 100 101 102 103 104 105 106 |
out_pid: if (new_nsp->ipc_ns) put_ipc_ns(new_nsp->ipc_ns); out_ipc: if (new_nsp->uts_ns) put_uts_ns(new_nsp->uts_ns); out_uts: if (new_nsp->mnt_ns) put_mnt_ns(new_nsp->mnt_ns); out_ns: |
98c0d07cb add a kmem_cache ... |
107 |
kmem_cache_free(nsproxy_cachep, new_nsp); |
467e9f4b5 fix create_new_na... |
108 |
return ERR_PTR(err); |
ab516013a [PATCH] namespace... |
109 110 111 112 113 114 |
} /* * called from clone. This now handles copy for nsproxy and all * namespaces therein. */ |
213dd266d namespace: ensure... |
115 |
int copy_namespaces(unsigned long flags, struct task_struct *tsk) |
ab516013a [PATCH] namespace... |
116 117 |
{ struct nsproxy *old_ns = tsk->nsproxy; |
1651e14e2 [PATCH] namespace... |
118 119 |
struct nsproxy *new_ns; int err = 0; |
ab516013a [PATCH] namespace... |
120 121 122 123 124 |
if (!old_ns) return 0; get_nsproxy(old_ns); |
30e49c263 pid namespaces: a... |
125 |
if (!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
18b6e0414 User namespaces: ... |
126 |
CLONE_NEWPID | CLONE_NEWNET))) |
1651e14e2 [PATCH] namespace... |
127 |
return 0; |
e3222c4ec Merge sys_clone()... |
128 129 |
if (!capable(CAP_SYS_ADMIN)) { err = -EPERM; |
1651e14e2 [PATCH] namespace... |
130 131 |
goto out; } |
02fdb36ae ipc: sysvsem: ref... |
132 133 134 135 136 137 138 139 140 141 142 |
/* * CLONE_NEWIPC must detach from the undolist: after switching * to a new ipc namespace, the semaphore arrays from the old * namespace are unreachable. In clone parlance, CLONE_SYSVSEM * means share undolist with parent, so we must forbid using * it along with CLONE_NEWIPC. */ if ((flags & CLONE_NEWIPC) && (flags & CLONE_SYSVSEM)) { err = -EINVAL; goto out; } |
e3222c4ec Merge sys_clone()... |
143 144 145 146 147 |
new_ns = create_new_namespaces(flags, tsk, tsk->fs); if (IS_ERR(new_ns)) { err = PTR_ERR(new_ns); goto out; } |
9a575a92d [PATCH] to nsproxy |
148 |
|
e3222c4ec Merge sys_clone()... |
149 |
tsk->nsproxy = new_ns; |
858d72ead cgroups: implemen... |
150 |
|
1651e14e2 [PATCH] namespace... |
151 |
out: |
444f378b2 Revert "[PATCH] n... |
152 |
put_nsproxy(old_ns); |
1651e14e2 [PATCH] namespace... |
153 |
return err; |
ab516013a [PATCH] namespace... |
154 155 156 157 |
} void free_nsproxy(struct nsproxy *ns) { |
9a575a92d [PATCH] to nsproxy |
158 159 160 161 162 163 164 165 |
if (ns->mnt_ns) put_mnt_ns(ns->mnt_ns); if (ns->uts_ns) put_uts_ns(ns->uts_ns); if (ns->ipc_ns) put_ipc_ns(ns->ipc_ns); if (ns->pid_ns) put_pid_ns(ns->pid_ns); |
9dd776b6d [NET]: Add networ... |
166 |
put_net(ns->net_ns); |
98c0d07cb add a kmem_cache ... |
167 |
kmem_cache_free(nsproxy_cachep, ns); |
ab516013a [PATCH] namespace... |
168 |
} |
e3222c4ec Merge sys_clone()... |
169 170 171 |
/* * Called from unshare. Unshare all the namespaces part of nsproxy. |
4e71e474c fix refcounting o... |
172 |
* On success, returns the new nsproxy. |
e3222c4ec Merge sys_clone()... |
173 174 175 176 |
*/ int unshare_nsproxy_namespaces(unsigned long unshare_flags, struct nsproxy **new_nsp, struct fs_struct *new_fs) { |
e3222c4ec Merge sys_clone()... |
177 |
int err = 0; |
77ec739d8 user namespace: a... |
178 |
if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
18b6e0414 User namespaces: ... |
179 |
CLONE_NEWNET))) |
e3222c4ec Merge sys_clone()... |
180 |
return 0; |
e3222c4ec Merge sys_clone()... |
181 182 |
if (!capable(CAP_SYS_ADMIN)) return -EPERM; |
e3222c4ec Merge sys_clone()... |
183 184 |
*new_nsp = create_new_namespaces(unshare_flags, current, new_fs ? new_fs : current->fs); |
858d72ead cgroups: implemen... |
185 |
if (IS_ERR(*new_nsp)) { |
e3222c4ec Merge sys_clone()... |
186 |
err = PTR_ERR(*new_nsp); |
858d72ead cgroups: implemen... |
187 188 |
goto out; } |
e885dcde7 cgroup_clone: use... |
189 |
err = ns_cgroup_clone(current, task_pid(current)); |
858d72ead cgroups: implemen... |
190 191 192 193 |
if (err) put_nsproxy(*new_nsp); out: |
e3222c4ec Merge sys_clone()... |
194 195 |
return err; } |
98c0d07cb add a kmem_cache ... |
196 |
|
cf7b708c8 Make access to ta... |
197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 |
void switch_task_namespaces(struct task_struct *p, struct nsproxy *new) { struct nsproxy *ns; might_sleep(); ns = p->nsproxy; rcu_assign_pointer(p->nsproxy, new); if (ns && atomic_dec_and_test(&ns->count)) { /* * wait for others to get what they want from this nsproxy. * * cannot release this nsproxy via the call_rcu() since * put_mnt_ns() will want to sleep */ synchronize_rcu(); free_nsproxy(ns); } } void exit_task_namespaces(struct task_struct *p) { switch_task_namespaces(p, NULL); } |
98c0d07cb add a kmem_cache ... |
223 224 |
static int __init nsproxy_cache_init(void) { |
db8906da5 Use KMEM_CACHE ma... |
225 |
nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC); |
98c0d07cb add a kmem_cache ... |
226 227 228 229 |
return 0; } module_init(nsproxy_cache_init); |