Commit | Line | Data |
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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ab516013 SH |
2 | /* |
3 | * Copyright (C) 2006 IBM Corporation | |
4 | * | |
5 | * Author: Serge Hallyn <serue@us.ibm.com> | |
6 | * | |
25b21cb2 KK |
7 | * Jun 2006 - namespaces support |
8 | * OpenVZ, SWsoft Inc. | |
9 | * Pavel Emelianov <xemul@openvz.org> | |
ab516013 SH |
10 | */ |
11 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
9984de1a | 13 | #include <linux/export.h> |
ab516013 | 14 | #include <linux/nsproxy.h> |
0437eb59 | 15 | #include <linux/init_task.h> |
6b3286ed | 16 | #include <linux/mnt_namespace.h> |
4865ecf1 | 17 | #include <linux/utsname.h> |
9a575a92 | 18 | #include <linux/pid_namespace.h> |
9dd776b6 | 19 | #include <net/net_namespace.h> |
ae5e1b22 | 20 | #include <linux/ipc_namespace.h> |
769071ac | 21 | #include <linux/time_namespace.h> |
f2a8d52e | 22 | #include <linux/fs_struct.h> |
303cc571 | 23 | #include <linux/proc_fs.h> |
0bb80f24 | 24 | #include <linux/proc_ns.h> |
0663c6f8 EB |
25 | #include <linux/file.h> |
26 | #include <linux/syscalls.h> | |
a79a908f | 27 | #include <linux/cgroup.h> |
e4222673 | 28 | #include <linux/perf_event.h> |
0437eb59 | 29 | |
98c0d07c CLG |
30 | static struct kmem_cache *nsproxy_cachep; |
31 | ||
8467005d | 32 | struct nsproxy init_nsproxy = { |
2ddd3cac | 33 | .count = REFCOUNT_INIT(1), |
c2b1df2e | 34 | .uts_ns = &init_uts_ns, |
8467005d | 35 | #if defined(CONFIG_POSIX_MQUEUE) || defined(CONFIG_SYSVIPC) |
c2b1df2e | 36 | .ipc_ns = &init_ipc_ns, |
8467005d | 37 | #endif |
c2b1df2e AL |
38 | .mnt_ns = NULL, |
39 | .pid_ns_for_children = &init_pid_ns, | |
8467005d | 40 | #ifdef CONFIG_NET |
c2b1df2e | 41 | .net_ns = &init_net, |
8467005d | 42 | #endif |
a79a908f AK |
43 | #ifdef CONFIG_CGROUPS |
44 | .cgroup_ns = &init_cgroup_ns, | |
45 | #endif | |
769071ac AV |
46 | #ifdef CONFIG_TIME_NS |
47 | .time_ns = &init_time_ns, | |
48 | .time_ns_for_children = &init_time_ns, | |
49 | #endif | |
8467005d | 50 | }; |
ab516013 | 51 | |
90af90d7 | 52 | static inline struct nsproxy *create_nsproxy(void) |
ab516013 | 53 | { |
90af90d7 | 54 | struct nsproxy *nsproxy; |
ab516013 | 55 | |
90af90d7 AD |
56 | nsproxy = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL); |
57 | if (nsproxy) | |
2ddd3cac | 58 | refcount_set(&nsproxy->count, 1); |
90af90d7 | 59 | return nsproxy; |
ab516013 SH |
60 | } |
61 | ||
62 | /* | |
e3222c4e BP |
63 | * Create new nsproxy and all of its the associated namespaces. |
64 | * Return the newly created nsproxy. Do not attach this to the task, | |
65 | * leave it to the caller to do proper locking and attach it to task. | |
ab516013 | 66 | */ |
213dd266 | 67 | static struct nsproxy *create_new_namespaces(unsigned long flags, |
bcf58e72 EB |
68 | struct task_struct *tsk, struct user_namespace *user_ns, |
69 | struct fs_struct *new_fs) | |
ab516013 | 70 | { |
e3222c4e | 71 | struct nsproxy *new_nsp; |
467e9f4b | 72 | int err; |
ab516013 | 73 | |
90af90d7 | 74 | new_nsp = create_nsproxy(); |
e3222c4e BP |
75 | if (!new_nsp) |
76 | return ERR_PTR(-ENOMEM); | |
1651e14e | 77 | |
bcf58e72 | 78 | new_nsp->mnt_ns = copy_mnt_ns(flags, tsk->nsproxy->mnt_ns, user_ns, new_fs); |
467e9f4b CLG |
79 | if (IS_ERR(new_nsp->mnt_ns)) { |
80 | err = PTR_ERR(new_nsp->mnt_ns); | |
e3222c4e | 81 | goto out_ns; |
467e9f4b | 82 | } |
e3222c4e | 83 | |
bcf58e72 | 84 | new_nsp->uts_ns = copy_utsname(flags, user_ns, tsk->nsproxy->uts_ns); |
467e9f4b CLG |
85 | if (IS_ERR(new_nsp->uts_ns)) { |
86 | err = PTR_ERR(new_nsp->uts_ns); | |
e3222c4e | 87 | goto out_uts; |
467e9f4b | 88 | } |
e3222c4e | 89 | |
bcf58e72 | 90 | new_nsp->ipc_ns = copy_ipcs(flags, user_ns, tsk->nsproxy->ipc_ns); |
467e9f4b CLG |
91 | if (IS_ERR(new_nsp->ipc_ns)) { |
92 | err = PTR_ERR(new_nsp->ipc_ns); | |
e3222c4e | 93 | goto out_ipc; |
467e9f4b | 94 | } |
e3222c4e | 95 | |
c2b1df2e AL |
96 | new_nsp->pid_ns_for_children = |
97 | copy_pid_ns(flags, user_ns, tsk->nsproxy->pid_ns_for_children); | |
98 | if (IS_ERR(new_nsp->pid_ns_for_children)) { | |
99 | err = PTR_ERR(new_nsp->pid_ns_for_children); | |
e3222c4e | 100 | goto out_pid; |
467e9f4b | 101 | } |
e3222c4e | 102 | |
a79a908f AK |
103 | new_nsp->cgroup_ns = copy_cgroup_ns(flags, user_ns, |
104 | tsk->nsproxy->cgroup_ns); | |
105 | if (IS_ERR(new_nsp->cgroup_ns)) { | |
106 | err = PTR_ERR(new_nsp->cgroup_ns); | |
107 | goto out_cgroup; | |
108 | } | |
109 | ||
bcf58e72 | 110 | new_nsp->net_ns = copy_net_ns(flags, user_ns, tsk->nsproxy->net_ns); |
9dd776b6 EB |
111 | if (IS_ERR(new_nsp->net_ns)) { |
112 | err = PTR_ERR(new_nsp->net_ns); | |
113 | goto out_net; | |
114 | } | |
115 | ||
769071ac AV |
116 | new_nsp->time_ns_for_children = copy_time_ns(flags, user_ns, |
117 | tsk->nsproxy->time_ns_for_children); | |
118 | if (IS_ERR(new_nsp->time_ns_for_children)) { | |
119 | err = PTR_ERR(new_nsp->time_ns_for_children); | |
120 | goto out_time; | |
121 | } | |
122 | new_nsp->time_ns = get_time_ns(tsk->nsproxy->time_ns); | |
123 | ||
e3222c4e BP |
124 | return new_nsp; |
125 | ||
769071ac AV |
126 | out_time: |
127 | put_net(new_nsp->net_ns); | |
9dd776b6 | 128 | out_net: |
a79a908f AK |
129 | put_cgroup_ns(new_nsp->cgroup_ns); |
130 | out_cgroup: | |
c2b1df2e AL |
131 | if (new_nsp->pid_ns_for_children) |
132 | put_pid_ns(new_nsp->pid_ns_for_children); | |
e3222c4e BP |
133 | out_pid: |
134 | if (new_nsp->ipc_ns) | |
135 | put_ipc_ns(new_nsp->ipc_ns); | |
136 | out_ipc: | |
137 | if (new_nsp->uts_ns) | |
138 | put_uts_ns(new_nsp->uts_ns); | |
139 | out_uts: | |
140 | if (new_nsp->mnt_ns) | |
141 | put_mnt_ns(new_nsp->mnt_ns); | |
142 | out_ns: | |
98c0d07c | 143 | kmem_cache_free(nsproxy_cachep, new_nsp); |
467e9f4b | 144 | return ERR_PTR(err); |
ab516013 SH |
145 | } |
146 | ||
147 | /* | |
148 | * called from clone. This now handles copy for nsproxy and all | |
149 | * namespaces therein. | |
150 | */ | |
213dd266 | 151 | int copy_namespaces(unsigned long flags, struct task_struct *tsk) |
ab516013 SH |
152 | { |
153 | struct nsproxy *old_ns = tsk->nsproxy; | |
b33c77ef | 154 | struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns); |
1651e14e | 155 | struct nsproxy *new_ns; |
ab516013 | 156 | |
dbef0c1c | 157 | if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
a79a908f | 158 | CLONE_NEWPID | CLONE_NEWNET | |
769071ac | 159 | CLONE_NEWCGROUP | CLONE_NEWTIME)))) { |
2b5f9dad AV |
160 | if ((flags & CLONE_VM) || |
161 | likely(old_ns->time_ns_for_children == old_ns->time_ns)) { | |
769071ac AV |
162 | get_nsproxy(old_ns); |
163 | return 0; | |
164 | } | |
165 | } else if (!ns_capable(user_ns, CAP_SYS_ADMIN)) | |
dbef0c1c EB |
166 | return -EPERM; |
167 | ||
02fdb36a SH |
168 | /* |
169 | * CLONE_NEWIPC must detach from the undolist: after switching | |
170 | * to a new ipc namespace, the semaphore arrays from the old | |
171 | * namespace are unreachable. In clone parlance, CLONE_SYSVSEM | |
172 | * means share undolist with parent, so we must forbid using | |
173 | * it along with CLONE_NEWIPC. | |
174 | */ | |
21e85194 | 175 | if ((flags & (CLONE_NEWIPC | CLONE_SYSVSEM)) == |
aabe19b8 | 176 | (CLONE_NEWIPC | CLONE_SYSVSEM)) |
dbef0c1c | 177 | return -EINVAL; |
02fdb36a | 178 | |
d7d48f62 | 179 | new_ns = create_new_namespaces(flags, tsk, user_ns, tsk->fs); |
dbef0c1c EB |
180 | if (IS_ERR(new_ns)) |
181 | return PTR_ERR(new_ns); | |
9a575a92 | 182 | |
2b5f9dad AV |
183 | if ((flags & CLONE_VM) == 0) |
184 | timens_on_fork(new_ns, tsk); | |
769071ac | 185 | |
e3222c4e | 186 | tsk->nsproxy = new_ns; |
dbef0c1c | 187 | return 0; |
ab516013 SH |
188 | } |
189 | ||
190 | void free_nsproxy(struct nsproxy *ns) | |
191 | { | |
9a575a92 CLG |
192 | if (ns->mnt_ns) |
193 | put_mnt_ns(ns->mnt_ns); | |
194 | if (ns->uts_ns) | |
195 | put_uts_ns(ns->uts_ns); | |
196 | if (ns->ipc_ns) | |
197 | put_ipc_ns(ns->ipc_ns); | |
c2b1df2e AL |
198 | if (ns->pid_ns_for_children) |
199 | put_pid_ns(ns->pid_ns_for_children); | |
769071ac AV |
200 | if (ns->time_ns) |
201 | put_time_ns(ns->time_ns); | |
202 | if (ns->time_ns_for_children) | |
203 | put_time_ns(ns->time_ns_for_children); | |
a79a908f | 204 | put_cgroup_ns(ns->cgroup_ns); |
9dd776b6 | 205 | put_net(ns->net_ns); |
98c0d07c | 206 | kmem_cache_free(nsproxy_cachep, ns); |
ab516013 | 207 | } |
e3222c4e BP |
208 | |
209 | /* | |
210 | * Called from unshare. Unshare all the namespaces part of nsproxy. | |
4e71e474 | 211 | * On success, returns the new nsproxy. |
e3222c4e BP |
212 | */ |
213 | int unshare_nsproxy_namespaces(unsigned long unshare_flags, | |
b2e0d987 | 214 | struct nsproxy **new_nsp, struct cred *new_cred, struct fs_struct *new_fs) |
e3222c4e | 215 | { |
bcf58e72 | 216 | struct user_namespace *user_ns; |
e3222c4e BP |
217 | int err = 0; |
218 | ||
77ec739d | 219 | if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |
769071ac AV |
220 | CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP | |
221 | CLONE_NEWTIME))) | |
e3222c4e BP |
222 | return 0; |
223 | ||
b2e0d987 EB |
224 | user_ns = new_cred ? new_cred->user_ns : current_user_ns(); |
225 | if (!ns_capable(user_ns, CAP_SYS_ADMIN)) | |
e3222c4e BP |
226 | return -EPERM; |
227 | ||
bcf58e72 | 228 | *new_nsp = create_new_namespaces(unshare_flags, current, user_ns, |
b2e0d987 | 229 | new_fs ? new_fs : current->fs); |
858d72ea | 230 | if (IS_ERR(*new_nsp)) { |
e3222c4e | 231 | err = PTR_ERR(*new_nsp); |
858d72ea SH |
232 | goto out; |
233 | } | |
234 | ||
858d72ea | 235 | out: |
e3222c4e BP |
236 | return err; |
237 | } | |
98c0d07c | 238 | |
cf7b708c PE |
239 | void switch_task_namespaces(struct task_struct *p, struct nsproxy *new) |
240 | { | |
241 | struct nsproxy *ns; | |
242 | ||
243 | might_sleep(); | |
244 | ||
728dba3a | 245 | task_lock(p); |
cf7b708c | 246 | ns = p->nsproxy; |
728dba3a EB |
247 | p->nsproxy = new; |
248 | task_unlock(p); | |
cf7b708c | 249 | |
aabe19b8 HS |
250 | if (ns) |
251 | put_nsproxy(ns); | |
cf7b708c PE |
252 | } |
253 | ||
254 | void exit_task_namespaces(struct task_struct *p) | |
255 | { | |
256 | switch_task_namespaces(p, NULL); | |
257 | } | |
258 | ||
2b5f9dad AV |
259 | int exec_task_namespaces(void) |
260 | { | |
261 | struct task_struct *tsk = current; | |
262 | struct nsproxy *new; | |
263 | ||
264 | if (tsk->nsproxy->time_ns_for_children == tsk->nsproxy->time_ns) | |
265 | return 0; | |
266 | ||
267 | new = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs); | |
268 | if (IS_ERR(new)) | |
269 | return PTR_ERR(new); | |
270 | ||
271 | timens_on_fork(new, tsk); | |
272 | switch_task_namespaces(tsk, new); | |
273 | return 0; | |
274 | } | |
275 | ||
303cc571 CB |
276 | static int check_setns_flags(unsigned long flags) |
277 | { | |
278 | if (!flags || (flags & ~(CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | | |
76c12881 CB |
279 | CLONE_NEWNET | CLONE_NEWTIME | CLONE_NEWUSER | |
280 | CLONE_NEWPID | CLONE_NEWCGROUP))) | |
303cc571 CB |
281 | return -EINVAL; |
282 | ||
283 | #ifndef CONFIG_USER_NS | |
284 | if (flags & CLONE_NEWUSER) | |
285 | return -EINVAL; | |
286 | #endif | |
287 | #ifndef CONFIG_PID_NS | |
288 | if (flags & CLONE_NEWPID) | |
289 | return -EINVAL; | |
290 | #endif | |
291 | #ifndef CONFIG_UTS_NS | |
292 | if (flags & CLONE_NEWUTS) | |
293 | return -EINVAL; | |
294 | #endif | |
295 | #ifndef CONFIG_IPC_NS | |
296 | if (flags & CLONE_NEWIPC) | |
297 | return -EINVAL; | |
298 | #endif | |
299 | #ifndef CONFIG_CGROUPS | |
300 | if (flags & CLONE_NEWCGROUP) | |
301 | return -EINVAL; | |
302 | #endif | |
303 | #ifndef CONFIG_NET_NS | |
304 | if (flags & CLONE_NEWNET) | |
305 | return -EINVAL; | |
306 | #endif | |
76c12881 CB |
307 | #ifndef CONFIG_TIME_NS |
308 | if (flags & CLONE_NEWTIME) | |
309 | return -EINVAL; | |
310 | #endif | |
303cc571 CB |
311 | |
312 | return 0; | |
313 | } | |
314 | ||
f2a8d52e CB |
315 | static void put_nsset(struct nsset *nsset) |
316 | { | |
317 | unsigned flags = nsset->flags; | |
318 | ||
319 | if (flags & CLONE_NEWUSER) | |
320 | put_cred(nsset_cred(nsset)); | |
303cc571 CB |
321 | /* |
322 | * We only created a temporary copy if we attached to more than just | |
323 | * the mount namespace. | |
324 | */ | |
325 | if (nsset->fs && (flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS)) | |
326 | free_fs_struct(nsset->fs); | |
f2a8d52e CB |
327 | if (nsset->nsproxy) |
328 | free_nsproxy(nsset->nsproxy); | |
329 | } | |
330 | ||
303cc571 | 331 | static int prepare_nsset(unsigned flags, struct nsset *nsset) |
f2a8d52e CB |
332 | { |
333 | struct task_struct *me = current; | |
334 | ||
335 | nsset->nsproxy = create_new_namespaces(0, me, current_user_ns(), me->fs); | |
336 | if (IS_ERR(nsset->nsproxy)) | |
337 | return PTR_ERR(nsset->nsproxy); | |
338 | ||
303cc571 | 339 | if (flags & CLONE_NEWUSER) |
f2a8d52e CB |
340 | nsset->cred = prepare_creds(); |
341 | else | |
342 | nsset->cred = current_cred(); | |
343 | if (!nsset->cred) | |
344 | goto out; | |
345 | ||
303cc571 CB |
346 | /* Only create a temporary copy of fs_struct if we really need to. */ |
347 | if (flags == CLONE_NEWNS) { | |
f2a8d52e | 348 | nsset->fs = me->fs; |
303cc571 CB |
349 | } else if (flags & CLONE_NEWNS) { |
350 | nsset->fs = copy_fs_struct(me->fs); | |
351 | if (!nsset->fs) | |
352 | goto out; | |
353 | } | |
f2a8d52e | 354 | |
303cc571 | 355 | nsset->flags = flags; |
f2a8d52e CB |
356 | return 0; |
357 | ||
358 | out: | |
359 | put_nsset(nsset); | |
360 | return -ENOMEM; | |
361 | } | |
362 | ||
303cc571 CB |
363 | static inline int validate_ns(struct nsset *nsset, struct ns_common *ns) |
364 | { | |
365 | return ns->ops->install(nsset, ns); | |
366 | } | |
367 | ||
368 | /* | |
369 | * This is the inverse operation to unshare(). | |
370 | * Ordering is equivalent to the standard ordering used everywhere else | |
371 | * during unshare and process creation. The switch to the new set of | |
372 | * namespaces occurs at the point of no return after installation of | |
373 | * all requested namespaces was successful in commit_nsset(). | |
374 | */ | |
375 | static int validate_nsset(struct nsset *nsset, struct pid *pid) | |
376 | { | |
377 | int ret = 0; | |
378 | unsigned flags = nsset->flags; | |
379 | struct user_namespace *user_ns = NULL; | |
380 | struct pid_namespace *pid_ns = NULL; | |
381 | struct nsproxy *nsp; | |
382 | struct task_struct *tsk; | |
383 | ||
384 | /* Take a "snapshot" of the target task's namespaces. */ | |
385 | rcu_read_lock(); | |
386 | tsk = pid_task(pid, PIDTYPE_PID); | |
387 | if (!tsk) { | |
388 | rcu_read_unlock(); | |
389 | return -ESRCH; | |
390 | } | |
391 | ||
392 | if (!ptrace_may_access(tsk, PTRACE_MODE_READ_REALCREDS)) { | |
393 | rcu_read_unlock(); | |
394 | return -EPERM; | |
395 | } | |
396 | ||
397 | task_lock(tsk); | |
398 | nsp = tsk->nsproxy; | |
399 | if (nsp) | |
400 | get_nsproxy(nsp); | |
401 | task_unlock(tsk); | |
402 | if (!nsp) { | |
403 | rcu_read_unlock(); | |
404 | return -ESRCH; | |
405 | } | |
406 | ||
407 | #ifdef CONFIG_PID_NS | |
408 | if (flags & CLONE_NEWPID) { | |
409 | pid_ns = task_active_pid_ns(tsk); | |
410 | if (unlikely(!pid_ns)) { | |
411 | rcu_read_unlock(); | |
412 | ret = -ESRCH; | |
413 | goto out; | |
414 | } | |
415 | get_pid_ns(pid_ns); | |
416 | } | |
417 | #endif | |
418 | ||
419 | #ifdef CONFIG_USER_NS | |
420 | if (flags & CLONE_NEWUSER) | |
421 | user_ns = get_user_ns(__task_cred(tsk)->user_ns); | |
422 | #endif | |
423 | rcu_read_unlock(); | |
424 | ||
425 | /* | |
426 | * Install requested namespaces. The caller will have | |
427 | * verified earlier that the requested namespaces are | |
428 | * supported on this kernel. We don't report errors here | |
429 | * if a namespace is requested that isn't supported. | |
430 | */ | |
431 | #ifdef CONFIG_USER_NS | |
432 | if (flags & CLONE_NEWUSER) { | |
433 | ret = validate_ns(nsset, &user_ns->ns); | |
434 | if (ret) | |
435 | goto out; | |
436 | } | |
437 | #endif | |
438 | ||
439 | if (flags & CLONE_NEWNS) { | |
440 | ret = validate_ns(nsset, from_mnt_ns(nsp->mnt_ns)); | |
441 | if (ret) | |
442 | goto out; | |
443 | } | |
444 | ||
445 | #ifdef CONFIG_UTS_NS | |
446 | if (flags & CLONE_NEWUTS) { | |
447 | ret = validate_ns(nsset, &nsp->uts_ns->ns); | |
448 | if (ret) | |
449 | goto out; | |
450 | } | |
451 | #endif | |
452 | ||
453 | #ifdef CONFIG_IPC_NS | |
454 | if (flags & CLONE_NEWIPC) { | |
455 | ret = validate_ns(nsset, &nsp->ipc_ns->ns); | |
456 | if (ret) | |
457 | goto out; | |
458 | } | |
459 | #endif | |
460 | ||
461 | #ifdef CONFIG_PID_NS | |
462 | if (flags & CLONE_NEWPID) { | |
463 | ret = validate_ns(nsset, &pid_ns->ns); | |
464 | if (ret) | |
465 | goto out; | |
466 | } | |
467 | #endif | |
468 | ||
469 | #ifdef CONFIG_CGROUPS | |
470 | if (flags & CLONE_NEWCGROUP) { | |
471 | ret = validate_ns(nsset, &nsp->cgroup_ns->ns); | |
472 | if (ret) | |
473 | goto out; | |
474 | } | |
475 | #endif | |
476 | ||
477 | #ifdef CONFIG_NET_NS | |
478 | if (flags & CLONE_NEWNET) { | |
479 | ret = validate_ns(nsset, &nsp->net_ns->ns); | |
480 | if (ret) | |
481 | goto out; | |
482 | } | |
483 | #endif | |
484 | ||
76c12881 CB |
485 | #ifdef CONFIG_TIME_NS |
486 | if (flags & CLONE_NEWTIME) { | |
487 | ret = validate_ns(nsset, &nsp->time_ns->ns); | |
488 | if (ret) | |
489 | goto out; | |
490 | } | |
491 | #endif | |
492 | ||
303cc571 CB |
493 | out: |
494 | if (pid_ns) | |
495 | put_pid_ns(pid_ns); | |
496 | if (nsp) | |
497 | put_nsproxy(nsp); | |
498 | put_user_ns(user_ns); | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
f2a8d52e CB |
503 | /* |
504 | * This is the point of no return. There are just a few namespaces | |
505 | * that do some actual work here and it's sufficiently minimal that | |
506 | * a separate ns_common operation seems unnecessary for now. | |
507 | * Unshare is doing the same thing. If we'll end up needing to do | |
508 | * more in a given namespace or a helper here is ultimately not | |
509 | * exported anymore a simple commit handler for each namespace | |
510 | * should be added to ns_common. | |
511 | */ | |
512 | static void commit_nsset(struct nsset *nsset) | |
513 | { | |
514 | unsigned flags = nsset->flags; | |
515 | struct task_struct *me = current; | |
516 | ||
517 | #ifdef CONFIG_USER_NS | |
518 | if (flags & CLONE_NEWUSER) { | |
519 | /* transfer ownership */ | |
520 | commit_creds(nsset_cred(nsset)); | |
521 | nsset->cred = NULL; | |
522 | } | |
523 | #endif | |
524 | ||
303cc571 CB |
525 | /* We only need to commit if we have used a temporary fs_struct. */ |
526 | if ((flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS)) { | |
527 | set_fs_root(me->fs, &nsset->fs->root); | |
528 | set_fs_pwd(me->fs, &nsset->fs->pwd); | |
529 | } | |
530 | ||
f2a8d52e CB |
531 | #ifdef CONFIG_IPC_NS |
532 | if (flags & CLONE_NEWIPC) | |
533 | exit_sem(me); | |
534 | #endif | |
535 | ||
76c12881 CB |
536 | #ifdef CONFIG_TIME_NS |
537 | if (flags & CLONE_NEWTIME) | |
538 | timens_commit(me, nsset->nsproxy->time_ns); | |
539 | #endif | |
540 | ||
f2a8d52e CB |
541 | /* transfer ownership */ |
542 | switch_task_namespaces(me, nsset->nsproxy); | |
543 | nsset->nsproxy = NULL; | |
544 | } | |
545 | ||
303cc571 | 546 | SYSCALL_DEFINE2(setns, int, fd, int, flags) |
0663c6f8 | 547 | { |
281117cc | 548 | struct fd f = fdget(fd); |
303cc571 | 549 | struct ns_common *ns = NULL; |
f2a8d52e | 550 | struct nsset nsset = {}; |
303cc571 | 551 | int err = 0; |
0663c6f8 | 552 | |
281117cc | 553 | if (!f.file) |
303cc571 CB |
554 | return -EBADF; |
555 | ||
281117cc AV |
556 | if (proc_ns_file(f.file)) { |
557 | ns = get_proc_ns(file_inode(f.file)); | |
303cc571 CB |
558 | if (flags && (ns->ops->type != flags)) |
559 | err = -EINVAL; | |
560 | flags = ns->ops->type; | |
281117cc | 561 | } else if (!IS_ERR(pidfd_pid(f.file))) { |
303cc571 CB |
562 | err = check_setns_flags(flags); |
563 | } else { | |
e571d4ee | 564 | err = -EINVAL; |
303cc571 CB |
565 | } |
566 | if (err) | |
0663c6f8 EB |
567 | goto out; |
568 | ||
303cc571 | 569 | err = prepare_nsset(flags, &nsset); |
f2a8d52e | 570 | if (err) |
0663c6f8 | 571 | goto out; |
0663c6f8 | 572 | |
281117cc | 573 | if (proc_ns_file(f.file)) |
303cc571 CB |
574 | err = validate_ns(&nsset, ns); |
575 | else | |
281117cc | 576 | err = validate_nsset(&nsset, f.file->private_data); |
f2a8d52e CB |
577 | if (!err) { |
578 | commit_nsset(&nsset); | |
579 | perf_event_namespaces(current); | |
0663c6f8 | 580 | } |
f2a8d52e | 581 | put_nsset(&nsset); |
0663c6f8 | 582 | out: |
281117cc | 583 | fdput(f); |
0663c6f8 EB |
584 | return err; |
585 | } | |
586 | ||
66577193 | 587 | int __init nsproxy_cache_init(void) |
98c0d07c | 588 | { |
30acd0bd | 589 | nsproxy_cachep = KMEM_CACHE(nsproxy, SLAB_PANIC|SLAB_ACCOUNT); |
98c0d07c CLG |
590 | return 0; |
591 | } |