nsproxy.c (75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) nsproxy.c (769071ac9f20b6a447410c7eaa55d1a5233ef40c)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2006 IBM Corporation
4 *
5 * Author: Serge Hallyn <serue@us.ibm.com>
6 *
7 * Jun 2006 - namespaces support
8 * OpenVZ, SWsoft Inc.

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13#include <linux/export.h>
14#include <linux/nsproxy.h>
15#include <linux/init_task.h>
16#include <linux/mnt_namespace.h>
17#include <linux/utsname.h>
18#include <linux/pid_namespace.h>
19#include <net/net_namespace.h>
20#include <linux/ipc_namespace.h>
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2006 IBM Corporation
4 *
5 * Author: Serge Hallyn <serue@us.ibm.com>
6 *
7 * Jun 2006 - namespaces support
8 * OpenVZ, SWsoft Inc.

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13#include <linux/export.h>
14#include <linux/nsproxy.h>
15#include <linux/init_task.h>
16#include <linux/mnt_namespace.h>
17#include <linux/utsname.h>
18#include <linux/pid_namespace.h>
19#include <net/net_namespace.h>
20#include <linux/ipc_namespace.h>
21#include <linux/time_namespace.h>
21#include <linux/proc_ns.h>
22#include <linux/file.h>
23#include <linux/syscalls.h>
24#include <linux/cgroup.h>
25#include <linux/perf_event.h>
26
27static struct kmem_cache *nsproxy_cachep;
28

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35 .mnt_ns = NULL,
36 .pid_ns_for_children = &init_pid_ns,
37#ifdef CONFIG_NET
38 .net_ns = &init_net,
39#endif
40#ifdef CONFIG_CGROUPS
41 .cgroup_ns = &init_cgroup_ns,
42#endif
22#include <linux/proc_ns.h>
23#include <linux/file.h>
24#include <linux/syscalls.h>
25#include <linux/cgroup.h>
26#include <linux/perf_event.h>
27
28static struct kmem_cache *nsproxy_cachep;
29

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36 .mnt_ns = NULL,
37 .pid_ns_for_children = &init_pid_ns,
38#ifdef CONFIG_NET
39 .net_ns = &init_net,
40#endif
41#ifdef CONFIG_CGROUPS
42 .cgroup_ns = &init_cgroup_ns,
43#endif
44#ifdef CONFIG_TIME_NS
45 .time_ns = &init_time_ns,
46 .time_ns_for_children = &init_time_ns,
47#endif
43};
44
45static inline struct nsproxy *create_nsproxy(void)
46{
47 struct nsproxy *nsproxy;
48
49 nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
50 if (nsproxy)

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101 }
102
103 new_nsp->net_ns = copy_net_ns(flags, user_ns, tsk->nsproxy->net_ns);
104 if (IS_ERR(new_nsp->net_ns)) {
105 err = PTR_ERR(new_nsp->net_ns);
106 goto out_net;
107 }
108
48};
49
50static inline struct nsproxy *create_nsproxy(void)
51{
52 struct nsproxy *nsproxy;
53
54 nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
55 if (nsproxy)

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106 }
107
108 new_nsp->net_ns = copy_net_ns(flags, user_ns, tsk->nsproxy->net_ns);
109 if (IS_ERR(new_nsp->net_ns)) {
110 err = PTR_ERR(new_nsp->net_ns);
111 goto out_net;
112 }
113
114 new_nsp->time_ns_for_children = copy_time_ns(flags, user_ns,
115 tsk->nsproxy->time_ns_for_children);
116 if (IS_ERR(new_nsp->time_ns_for_children)) {
117 err = PTR_ERR(new_nsp->time_ns_for_children);
118 goto out_time;
119 }
120 new_nsp->time_ns = get_time_ns(tsk->nsproxy->time_ns);
121
109 return new_nsp;
110
122 return new_nsp;
123
124out_time:
125 put_net(new_nsp->net_ns);
111out_net:
112 put_cgroup_ns(new_nsp->cgroup_ns);
113out_cgroup:
114 if (new_nsp->pid_ns_for_children)
115 put_pid_ns(new_nsp->pid_ns_for_children);
116out_pid:
117 if (new_nsp->ipc_ns)
118 put_ipc_ns(new_nsp->ipc_ns);

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131 * called from clone. This now handles copy for nsproxy and all
132 * namespaces therein.
133 */
134int copy_namespaces(unsigned long flags, struct task_struct *tsk)
135{
136 struct nsproxy *old_ns = tsk->nsproxy;
137 struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
138 struct nsproxy *new_ns;
126out_net:
127 put_cgroup_ns(new_nsp->cgroup_ns);
128out_cgroup:
129 if (new_nsp->pid_ns_for_children)
130 put_pid_ns(new_nsp->pid_ns_for_children);
131out_pid:
132 if (new_nsp->ipc_ns)
133 put_ipc_ns(new_nsp->ipc_ns);

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146 * called from clone. This now handles copy for nsproxy and all
147 * namespaces therein.
148 */
149int copy_namespaces(unsigned long flags, struct task_struct *tsk)
150{
151 struct nsproxy *old_ns = tsk->nsproxy;
152 struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
153 struct nsproxy *new_ns;
154 int ret;
139
140 if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
141 CLONE_NEWPID | CLONE_NEWNET |
155
156 if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
157 CLONE_NEWPID | CLONE_NEWNET |
142 CLONE_NEWCGROUP)))) {
143 get_nsproxy(old_ns);
144 return 0;
145 }
146
147 if (!ns_capable(user_ns, CAP_SYS_ADMIN))
158 CLONE_NEWCGROUP | CLONE_NEWTIME)))) {
159 if (likely(old_ns->time_ns_for_children == old_ns->time_ns)) {
160 get_nsproxy(old_ns);
161 return 0;
162 }
163 } else if (!ns_capable(user_ns, CAP_SYS_ADMIN))
148 return -EPERM;
149
150 /*
151 * CLONE_NEWIPC must detach from the undolist: after switching
152 * to a new ipc namespace, the semaphore arrays from the old
153 * namespace are unreachable. In clone parlance, CLONE_SYSVSEM
154 * means share undolist with parent, so we must forbid using
155 * it along with CLONE_NEWIPC.
156 */
157 if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) ==
158 (CLONE_NEWIPC | CLONE_SYSVSEM))
159 return -EINVAL;
160
161 new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs);
162 if (IS_ERR(new_ns))
163 return PTR_ERR(new_ns);
164
164 return -EPERM;
165
166 /*
167 * CLONE_NEWIPC must detach from the undolist: after switching
168 * to a new ipc namespace, the semaphore arrays from the old
169 * namespace are unreachable. In clone parlance, CLONE_SYSVSEM
170 * means share undolist with parent, so we must forbid using
171 * it along with CLONE_NEWIPC.
172 */
173 if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) ==
174 (CLONE_NEWIPC | CLONE_SYSVSEM))
175 return -EINVAL;
176
177 new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs);
178 if (IS_ERR(new_ns))
179 return PTR_ERR(new_ns);
180
181 ret = timens_on_fork(new_ns, tsk);
182 if (ret) {
183 free_nsproxy(new_ns);
184 return ret;
185 }
186
165 tsk->nsproxy = new_ns;
166 return 0;
167}
168
169void free_nsproxy(struct nsproxy *ns)
170{
171 if (ns->mnt_ns)
172 put_mnt_ns(ns->mnt_ns);
173 if (ns->uts_ns)
174 put_uts_ns(ns->uts_ns);
175 if (ns->ipc_ns)
176 put_ipc_ns(ns->ipc_ns);
177 if (ns->pid_ns_for_children)
178 put_pid_ns(ns->pid_ns_for_children);
187 tsk->nsproxy = new_ns;
188 return 0;
189}
190
191void free_nsproxy(struct nsproxy *ns)
192{
193 if (ns->mnt_ns)
194 put_mnt_ns(ns->mnt_ns);
195 if (ns->uts_ns)
196 put_uts_ns(ns->uts_ns);
197 if (ns->ipc_ns)
198 put_ipc_ns(ns->ipc_ns);
199 if (ns->pid_ns_for_children)
200 put_pid_ns(ns->pid_ns_for_children);
201 if (ns->time_ns)
202 put_time_ns(ns->time_ns);
203 if (ns->time_ns_for_children)
204 put_time_ns(ns->time_ns_for_children);
179 put_cgroup_ns(ns->cgroup_ns);
180 put_net(ns->net_ns);
181 kmem_cache_free(nsproxy_cachep, ns);
182}
183
184/*
185 * Called from unshare. Unshare all the namespaces part of nsproxy.
186 * On success, returns the new nsproxy.
187 */
188int unshare_nsproxy_namespaces(unsigned long unshare_flags,
189 struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct *new_fs)
190{
191 struct user_namespace *user_ns;
192 int err = 0;
193
194 if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
205 put_cgroup_ns(ns->cgroup_ns);
206 put_net(ns->net_ns);
207 kmem_cache_free(nsproxy_cachep, ns);
208}
209
210/*
211 * Called from unshare. Unshare all the namespaces part of nsproxy.
212 * On success, returns the new nsproxy.
213 */
214int unshare_nsproxy_namespaces(unsigned long unshare_flags,
215 struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct *new_fs)
216{
217 struct user_namespace *user_ns;
218 int err = 0;
219
220 if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
195 CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP)))
221 CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP |
222 CLONE_NEWTIME)))
196 return 0;
197
198 user_ns = new_cred ? new_cred->user_ns : current_user_ns();
199 if (!ns_capable(user_ns, CAP_SYS_ADMIN))
200 return -EPERM;
201
202 *new_nsp = create_new_namespaces(unshare_flags, current, user_ns,
203 new_fs ? new_fs : current->fs);

--- 70 unchanged lines hidden --- 		223 return 0;
224
225 user_ns = new_cred ? new_cred->user_ns : current_user_ns();
226 if (!ns_capable(user_ns, CAP_SYS_ADMIN))
227 return -EPERM;
228
229 *new_nsp = create_new_namespaces(unshare_flags, current, user_ns,
230 new_fs ? new_fs : current->fs);

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