add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/kernel/nsproxy.c
..
..
@@ -1,12 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  *  Copyright (C) 2006 IBM Corporation
3
4
  *
4
5
  *  Author: Serge Hallyn <serue@us.ibm.com>
5
- *
6
- *  This program is free software; you can redistribute it and/or
7
- *  modify it under the terms of the GNU General Public License as
8
- *  published by the Free Software Foundation, version 2 of the
9
- *  License.
10
6
  *
11
7
  *  Jun 2006 - namespaces support
12
8
  *             OpenVZ, SWsoft Inc.
..
..
@@ -22,6 +18,9 @@
22
18
 #include <linux/pid_namespace.h>
23
19
 #include <net/net_namespace.h>
24
20
 #include <linux/ipc_namespace.h>
21
+#include <linux/time_namespace.h>
22
+#include <linux/fs_struct.h>
23
+#include <linux/proc_fs.h>
25
24
 #include <linux/proc_ns.h>
26
25
 #include <linux/file.h>
27
26
 #include <linux/syscalls.h>
..
..
@@ -43,6 +42,10 @@
43
42
 #endif
44
43
 #ifdef CONFIG_CGROUPS
45
44
 	.cgroup_ns		= &init_cgroup_ns,
45
+#endif
46
+#ifdef CONFIG_TIME_NS
47
+	.time_ns		= &init_time_ns,
48
+	.time_ns_for_children	= &init_time_ns,
46
49
 #endif
47
50
 };
48
51
 
..
..
@@ -110,8 +113,18 @@
110
113
 		goto out_net;
111
114
 	}
112
115
 
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
+
113
124
 	return new_nsp;
114
125
 
126
+out_time:
127
+	put_net(new_nsp->net_ns);
115
128
 out_net:
116
129
 	put_cgroup_ns(new_nsp->cgroup_ns);
117
130
 out_cgroup:
..
..
@@ -140,15 +153,16 @@
140
153
 	struct nsproxy *old_ns = tsk->nsproxy;
141
154
 	struct user_namespace *user_ns = task_cred_xxx(tsk, user_ns);
142
155
 	struct nsproxy *new_ns;
156
+	int ret;
143
157
 
144
158
 	if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
145
159
 			      CLONE_NEWPID | CLONE_NEWNET |
146
-			      CLONE_NEWCGROUP)))) {
147
-		get_nsproxy(old_ns);
148
-		return 0;
149
-	}
150
-
151
-	if (!ns_capable(user_ns, CAP_SYS_ADMIN))
160
+			      CLONE_NEWCGROUP | CLONE_NEWTIME)))) {
161
+		if (likely(old_ns->time_ns_for_children == old_ns->time_ns)) {
162
+			get_nsproxy(old_ns);
163
+			return 0;
164
+		}
165
+	} else if (!ns_capable(user_ns, CAP_SYS_ADMIN))
152
166
 		return -EPERM;
153
167
 
154
168
 	/*
..
..
@@ -166,6 +180,12 @@
166
180
 	if (IS_ERR(new_ns))
167
181
 		return  PTR_ERR(new_ns);
168
182
 
183
+	ret = timens_on_fork(new_ns, tsk);
184
+	if (ret) {
185
+		free_nsproxy(new_ns);
186
+		return ret;
187
+	}
188
+
169
189
 	tsk->nsproxy = new_ns;
170
190
 	return 0;
171
191
 }
..
..
@@ -180,6 +200,10 @@
180
200
 		put_ipc_ns(ns->ipc_ns);
181
201
 	if (ns->pid_ns_for_children)
182
202
 		put_pid_ns(ns->pid_ns_for_children);
203
+	if (ns->time_ns)
204
+		put_time_ns(ns->time_ns);
205
+	if (ns->time_ns_for_children)
206
+		put_time_ns(ns->time_ns_for_children);
183
207
 	put_cgroup_ns(ns->cgroup_ns);
184
208
 	put_net(ns->net_ns);
185
209
 	kmem_cache_free(nsproxy_cachep, ns);
..
..
@@ -196,7 +220,8 @@
196
220
 	int err = 0;
197
221
 
198
222
 	if (!(unshare_flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
199
-			       CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP)))
223
+			       CLONE_NEWNET | CLONE_NEWPID | CLONE_NEWCGROUP |
224
+			       CLONE_NEWTIME)))
200
225
 		return 0;
201
226
 
202
227
 	user_ns = new_cred ? new_cred->user_ns : current_user_ns();
..
..
@@ -234,37 +259,313 @@
234
259
 	switch_task_namespaces(p, NULL);
235
260
 }
236
261
 
237
-SYSCALL_DEFINE2(setns, int, fd, int, nstype)
262
+static int check_setns_flags(unsigned long flags)
238
263
 {
239
-	struct task_struct *tsk = current;
240
-	struct nsproxy *new_nsproxy;
264
+	if (!flags || (flags & ~(CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC |
265
+				 CLONE_NEWNET | CLONE_NEWTIME | CLONE_NEWUSER |
266
+				 CLONE_NEWPID | CLONE_NEWCGROUP)))
267
+		return -EINVAL;
268
+
269
+#ifndef CONFIG_USER_NS
270
+	if (flags & CLONE_NEWUSER)
271
+		return -EINVAL;
272
+#endif
273
+#ifndef CONFIG_PID_NS
274
+	if (flags & CLONE_NEWPID)
275
+		return -EINVAL;
276
+#endif
277
+#ifndef CONFIG_UTS_NS
278
+	if (flags & CLONE_NEWUTS)
279
+		return -EINVAL;
280
+#endif
281
+#ifndef CONFIG_IPC_NS
282
+	if (flags & CLONE_NEWIPC)
283
+		return -EINVAL;
284
+#endif
285
+#ifndef CONFIG_CGROUPS
286
+	if (flags & CLONE_NEWCGROUP)
287
+		return -EINVAL;
288
+#endif
289
+#ifndef CONFIG_NET_NS
290
+	if (flags & CLONE_NEWNET)
291
+		return -EINVAL;
292
+#endif
293
+#ifndef CONFIG_TIME_NS
294
+	if (flags & CLONE_NEWTIME)
295
+		return -EINVAL;
296
+#endif
297
+
298
+	return 0;
299
+}
300
+
301
+static void put_nsset(struct nsset *nsset)
302
+{
303
+	unsigned flags = nsset->flags;
304
+
305
+	if (flags & CLONE_NEWUSER)
306
+		put_cred(nsset_cred(nsset));
307
+	/*
308
+	 * We only created a temporary copy if we attached to more than just
309
+	 * the mount namespace.
310
+	 */
311
+	if (nsset->fs && (flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS))
312
+		free_fs_struct(nsset->fs);
313
+	if (nsset->nsproxy)
314
+		free_nsproxy(nsset->nsproxy);
315
+}
316
+
317
+static int prepare_nsset(unsigned flags, struct nsset *nsset)
318
+{
319
+	struct task_struct *me = current;
320
+
321
+	nsset->nsproxy = create_new_namespaces(0, me, current_user_ns(), me->fs);
322
+	if (IS_ERR(nsset->nsproxy))
323
+		return PTR_ERR(nsset->nsproxy);
324
+
325
+	if (flags & CLONE_NEWUSER)
326
+		nsset->cred = prepare_creds();
327
+	else
328
+		nsset->cred = current_cred();
329
+	if (!nsset->cred)
330
+		goto out;
331
+
332
+	/* Only create a temporary copy of fs_struct if we really need to. */
333
+	if (flags == CLONE_NEWNS) {
334
+		nsset->fs = me->fs;
335
+	} else if (flags & CLONE_NEWNS) {
336
+		nsset->fs = copy_fs_struct(me->fs);
337
+		if (!nsset->fs)
338
+			goto out;
339
+	}
340
+
341
+	nsset->flags = flags;
342
+	return 0;
343
+
344
+out:
345
+	put_nsset(nsset);
346
+	return -ENOMEM;
347
+}
348
+
349
+static inline int validate_ns(struct nsset *nsset, struct ns_common *ns)
350
+{
351
+	return ns->ops->install(nsset, ns);
352
+}
353
+
354
+/*
355
+ * This is the inverse operation to unshare().
356
+ * Ordering is equivalent to the standard ordering used everywhere else
357
+ * during unshare and process creation. The switch to the new set of
358
+ * namespaces occurs at the point of no return after installation of
359
+ * all requested namespaces was successful in commit_nsset().
360
+ */
361
+static int validate_nsset(struct nsset *nsset, struct pid *pid)
362
+{
363
+	int ret = 0;
364
+	unsigned flags = nsset->flags;
365
+	struct user_namespace *user_ns = NULL;
366
+	struct pid_namespace *pid_ns = NULL;
367
+	struct nsproxy *nsp;
368
+	struct task_struct *tsk;
369
+
370
+	/* Take a "snapshot" of the target task's namespaces. */
371
+	rcu_read_lock();
372
+	tsk = pid_task(pid, PIDTYPE_PID);
373
+	if (!tsk) {
374
+		rcu_read_unlock();
375
+		return -ESRCH;
376
+	}
377
+
378
+	if (!ptrace_may_access(tsk, PTRACE_MODE_READ_REALCREDS)) {
379
+		rcu_read_unlock();
380
+		return -EPERM;
381
+	}
382
+
383
+	task_lock(tsk);
384
+	nsp = tsk->nsproxy;
385
+	if (nsp)
386
+		get_nsproxy(nsp);
387
+	task_unlock(tsk);
388
+	if (!nsp) {
389
+		rcu_read_unlock();
390
+		return -ESRCH;
391
+	}
392
+
393
+#ifdef CONFIG_PID_NS
394
+	if (flags & CLONE_NEWPID) {
395
+		pid_ns = task_active_pid_ns(tsk);
396
+		if (unlikely(!pid_ns)) {
397
+			rcu_read_unlock();
398
+			ret = -ESRCH;
399
+			goto out;
400
+		}
401
+		get_pid_ns(pid_ns);
402
+	}
403
+#endif
404
+
405
+#ifdef CONFIG_USER_NS
406
+	if (flags & CLONE_NEWUSER)
407
+		user_ns = get_user_ns(__task_cred(tsk)->user_ns);
408
+#endif
409
+	rcu_read_unlock();
410
+
411
+	/*
412
+	 * Install requested namespaces. The caller will have
413
+	 * verified earlier that the requested namespaces are
414
+	 * supported on this kernel. We don't report errors here
415
+	 * if a namespace is requested that isn't supported.
416
+	 */
417
+#ifdef CONFIG_USER_NS
418
+	if (flags & CLONE_NEWUSER) {
419
+		ret = validate_ns(nsset, &user_ns->ns);
420
+		if (ret)
421
+			goto out;
422
+	}
423
+#endif
424
+
425
+	if (flags & CLONE_NEWNS) {
426
+		ret = validate_ns(nsset, from_mnt_ns(nsp->mnt_ns));
427
+		if (ret)
428
+			goto out;
429
+	}
430
+
431
+#ifdef CONFIG_UTS_NS
432
+	if (flags & CLONE_NEWUTS) {
433
+		ret = validate_ns(nsset, &nsp->uts_ns->ns);
434
+		if (ret)
435
+			goto out;
436
+	}
437
+#endif
438
+
439
+#ifdef CONFIG_IPC_NS
440
+	if (flags & CLONE_NEWIPC) {
441
+		ret = validate_ns(nsset, &nsp->ipc_ns->ns);
442
+		if (ret)
443
+			goto out;
444
+	}
445
+#endif
446
+
447
+#ifdef CONFIG_PID_NS
448
+	if (flags & CLONE_NEWPID) {
449
+		ret = validate_ns(nsset, &pid_ns->ns);
450
+		if (ret)
451
+			goto out;
452
+	}
453
+#endif
454
+
455
+#ifdef CONFIG_CGROUPS
456
+	if (flags & CLONE_NEWCGROUP) {
457
+		ret = validate_ns(nsset, &nsp->cgroup_ns->ns);
458
+		if (ret)
459
+			goto out;
460
+	}
461
+#endif
462
+
463
+#ifdef CONFIG_NET_NS
464
+	if (flags & CLONE_NEWNET) {
465
+		ret = validate_ns(nsset, &nsp->net_ns->ns);
466
+		if (ret)
467
+			goto out;
468
+	}
469
+#endif
470
+
471
+#ifdef CONFIG_TIME_NS
472
+	if (flags & CLONE_NEWTIME) {
473
+		ret = validate_ns(nsset, &nsp->time_ns->ns);
474
+		if (ret)
475
+			goto out;
476
+	}
477
+#endif
478
+
479
+out:
480
+	if (pid_ns)
481
+		put_pid_ns(pid_ns);
482
+	if (nsp)
483
+		put_nsproxy(nsp);
484
+	put_user_ns(user_ns);
485
+
486
+	return ret;
487
+}
488
+
489
+/*
490
+ * This is the point of no return. There are just a few namespaces
491
+ * that do some actual work here and it's sufficiently minimal that
492
+ * a separate ns_common operation seems unnecessary for now.
493
+ * Unshare is doing the same thing. If we'll end up needing to do
494
+ * more in a given namespace or a helper here is ultimately not
495
+ * exported anymore a simple commit handler for each namespace
496
+ * should be added to ns_common.
497
+ */
498
+static void commit_nsset(struct nsset *nsset)
499
+{
500
+	unsigned flags = nsset->flags;
501
+	struct task_struct *me = current;
502
+
503
+#ifdef CONFIG_USER_NS
504
+	if (flags & CLONE_NEWUSER) {
505
+		/* transfer ownership */
506
+		commit_creds(nsset_cred(nsset));
507
+		nsset->cred = NULL;
508
+	}
509
+#endif
510
+
511
+	/* We only need to commit if we have used a temporary fs_struct. */
512
+	if ((flags & CLONE_NEWNS) && (flags & ~CLONE_NEWNS)) {
513
+		set_fs_root(me->fs, &nsset->fs->root);
514
+		set_fs_pwd(me->fs, &nsset->fs->pwd);
515
+	}
516
+
517
+#ifdef CONFIG_IPC_NS
518
+	if (flags & CLONE_NEWIPC)
519
+		exit_sem(me);
520
+#endif
521
+
522
+#ifdef CONFIG_TIME_NS
523
+	if (flags & CLONE_NEWTIME)
524
+		timens_commit(me, nsset->nsproxy->time_ns);
525
+#endif
526
+
527
+	/* transfer ownership */
528
+	switch_task_namespaces(me, nsset->nsproxy);
529
+	nsset->nsproxy = NULL;
530
+}
531
+
532
+SYSCALL_DEFINE2(setns, int, fd, int, flags)
533
+{
241
534
 	struct file *file;
242
-	struct ns_common *ns;
243
-	int err;
535
+	struct ns_common *ns = NULL;
536
+	struct nsset nsset = {};
537
+	int err = 0;
244
538
 
245
-	file = proc_ns_fget(fd);
246
-	if (IS_ERR(file))
247
-		return PTR_ERR(file);
539
+	file = fget(fd);
540
+	if (!file)
541
+		return -EBADF;
248
542
 
249
-	err = -EINVAL;
250
-	ns = get_proc_ns(file_inode(file));
251
-	if (nstype && (ns->ops->type != nstype))
252
-		goto out;
253
-
254
-	new_nsproxy = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs);
255
-	if (IS_ERR(new_nsproxy)) {
256
-		err = PTR_ERR(new_nsproxy);
257
-		goto out;
543
+	if (proc_ns_file(file)) {
544
+		ns = get_proc_ns(file_inode(file));
545
+		if (flags && (ns->ops->type != flags))
546
+			err = -EINVAL;
547
+		flags = ns->ops->type;
548
+	} else if (!IS_ERR(pidfd_pid(file))) {
549
+		err = check_setns_flags(flags);
550
+	} else {
551
+		err = -EINVAL;
258
552
 	}
259
-
260
-	err = ns->ops->install(new_nsproxy, ns);
261
-	if (err) {
262
-		free_nsproxy(new_nsproxy);
553
+	if (err)
263
554
 		goto out;
264
-	}
265
-	switch_task_namespaces(tsk, new_nsproxy);
266
555
 
267
-	perf_event_namespaces(tsk);
556
+	err = prepare_nsset(flags, &nsset);
557
+	if (err)
558
+		goto out;
559
+
560
+	if (proc_ns_file(file))
561
+		err = validate_ns(&nsset, ns);
562
+	else
563
+		err = validate_nsset(&nsset, file->private_data);
564
+	if (!err) {
565
+		commit_nsset(&nsset);
566
+		perf_event_namespaces(current);
567
+	}
568
+	put_nsset(&nsset);
268
569
 out:
269
570
 	fput(file);
270
571
 	return err;