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Merge branch 'akpm'
[linux-2.6/next.git] / security / selinux / selinuxfs.c
blob902187657bc2f740750993c4abf44b242ad81d81
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul@paul-moore.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 /* Policy capability filenames */
45 static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms"
48 };
49
50 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
51
52 static int __init checkreqprot_setup(char *str)
53 {
54 unsigned long checkreqprot;
55 if (!strict_strtoul(str, 0, &checkreqprot))
56 selinux_checkreqprot = checkreqprot ? 1 : 0;
57 return 1;
58 }
59 __setup("checkreqprot=", checkreqprot_setup);
60
61 static DEFINE_MUTEX(sel_mutex);
62
63 /* global data for booleans */
64 static struct dentry *bool_dir;
65 static int bool_num;
66 static char **bool_pending_names;
67 static int *bool_pending_values;
68
69 /* global data for classes */
70 static struct dentry *class_dir;
71 static unsigned long last_class_ino;
72
73 static char policy_opened;
74
75 /* global data for policy capabilities */
76 static struct dentry *policycap_dir;
77
78 extern void selnl_notify_setenforce(int val);
79
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct *tsk,
82 u32 perms)
83 {
84 const struct task_security_struct *tsec;
85 u32 sid = 0;
86
87 rcu_read_lock();
88 tsec = __task_cred(tsk)->security;
89 if (tsec)
90 sid = tsec->sid;
91 rcu_read_unlock();
92 if (!tsec)
93 return -EACCES;
94
95 return avc_has_perm(sid, SECINITSID_SECURITY,
96 SECCLASS_SECURITY, perms, NULL);
97 }
98
99 enum sel_inos {
100 SEL_ROOT_INO = 2,
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
117 SEL_STATUS, /* export current status using mmap() */
118 SEL_POLICY, /* allow userspace to read the in kernel policy */
119 SEL_INO_NEXT, /* The next inode number to use */
120 };
121
122 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
123
124 #define SEL_INITCON_INO_OFFSET 0x01000000
125 #define SEL_BOOL_INO_OFFSET 0x02000000
126 #define SEL_CLASS_INO_OFFSET 0x04000000
127 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
128 #define SEL_INO_MASK 0x00ffffff
129
130 #define TMPBUFLEN 12
131 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
132 size_t count, loff_t *ppos)
133 {
134 char tmpbuf[TMPBUFLEN];
135 ssize_t length;
136
137 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
138 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
139 }
140
141 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
142 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
143 size_t count, loff_t *ppos)
144
145 {
146 char *page = NULL;
147 ssize_t length;
148 int new_value;
149
150 length = -ENOMEM;
151 if (count >= PAGE_SIZE)
152 goto out;
153
154 /* No partial writes. */
155 length = EINVAL;
156 if (*ppos != 0)
157 goto out;
158
159 length = -ENOMEM;
160 page = (char *)get_zeroed_page(GFP_KERNEL);
161 if (!page)
162 goto out;
163
164 length = -EFAULT;
165 if (copy_from_user(page, buf, count))
166 goto out;
167
168 length = -EINVAL;
169 if (sscanf(page, "%d", &new_value) != 1)
170 goto out;
171
172 if (new_value != selinux_enforcing) {
173 length = task_has_security(current, SECURITY__SETENFORCE);
174 if (length)
175 goto out;
176 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
177 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
178 new_value, selinux_enforcing,
179 audit_get_loginuid(current),
180 audit_get_sessionid(current));
181 selinux_enforcing = new_value;
182 if (selinux_enforcing)
183 avc_ss_reset(0);
184 selnl_notify_setenforce(selinux_enforcing);
185 selinux_status_update_setenforce(selinux_enforcing);
186 }
187 length = count;
188 out:
189 free_page((unsigned long) page);
190 return length;
191 }
192 #else
193 #define sel_write_enforce NULL
194 #endif
195
196 static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 .llseek = generic_file_llseek,
200 };
201
202 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
204 {
205 char tmpbuf[TMPBUFLEN];
206 ssize_t length;
207 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213 }
214
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
218 };
219
220 static int sel_open_handle_status(struct inode *inode, struct file *filp)
221 {
222 struct page *status = selinux_kernel_status_page();
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230 }
231
232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234 {
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242 }
243
244 static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246 {
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264 }
265
266 static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271 };
272
273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277 {
278 char *page = NULL;
279 ssize_t length;
280 int new_value;
281 extern int selinux_disable(void);
282
283 length = -ENOMEM;
284 if (count >= PAGE_SIZE)
285 goto out;
286
287 /* No partial writes. */
288 length = -EINVAL;
289 if (*ppos != 0)
290 goto out;
291
292 length = -ENOMEM;
293 page = (char *)get_zeroed_page(GFP_KERNEL);
294 if (!page)
295 goto out;
296
297 length = -EFAULT;
298 if (copy_from_user(page, buf, count))
299 goto out;
300
301 length = -EINVAL;
302 if (sscanf(page, "%d", &new_value) != 1)
303 goto out;
304
305 if (new_value) {
306 length = selinux_disable();
307 if (length)
308 goto out;
309 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
310 "selinux=0 auid=%u ses=%u",
311 audit_get_loginuid(current),
312 audit_get_sessionid(current));
313 }
314
315 length = count;
316 out:
317 free_page((unsigned long) page);
318 return length;
319 }
320 #else
321 #define sel_write_disable NULL
322 #endif
323
324 static const struct file_operations sel_disable_ops = {
325 .write = sel_write_disable,
326 .llseek = generic_file_llseek,
327 };
328
329 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
330 size_t count, loff_t *ppos)
331 {
332 char tmpbuf[TMPBUFLEN];
333 ssize_t length;
334
335 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
336 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
337 }
338
339 static const struct file_operations sel_policyvers_ops = {
340 .read = sel_read_policyvers,
341 .llseek = generic_file_llseek,
342 };
343
344 /* declaration for sel_write_load */
345 static int sel_make_bools(void);
346 static int sel_make_classes(void);
347 static int sel_make_policycap(void);
348
349 /* declaration for sel_make_class_dirs */
350 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
351 unsigned long *ino);
352
353 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
354 size_t count, loff_t *ppos)
355 {
356 char tmpbuf[TMPBUFLEN];
357 ssize_t length;
358
359 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
360 security_mls_enabled());
361 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
362 }
363
364 static const struct file_operations sel_mls_ops = {
365 .read = sel_read_mls,
366 .llseek = generic_file_llseek,
367 };
368
369 struct policy_load_memory {
370 size_t len;
371 void *data;
372 };
373
374 static int sel_open_policy(struct inode *inode, struct file *filp)
375 {
376 struct policy_load_memory *plm = NULL;
377 int rc;
378
379 BUG_ON(filp->private_data);
380
381 mutex_lock(&sel_mutex);
382
383 rc = task_has_security(current, SECURITY__READ_POLICY);
384 if (rc)
385 goto err;
386
387 rc = -EBUSY;
388 if (policy_opened)
389 goto err;
390
391 rc = -ENOMEM;
392 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
393 if (!plm)
394 goto err;
395
396 if (i_size_read(inode) != security_policydb_len()) {
397 mutex_lock(&inode->i_mutex);
398 i_size_write(inode, security_policydb_len());
399 mutex_unlock(&inode->i_mutex);
400 }
401
402 rc = security_read_policy(&plm->data, &plm->len);
403 if (rc)
404 goto err;
405
406 policy_opened = 1;
407
408 filp->private_data = plm;
409
410 mutex_unlock(&sel_mutex);
411
412 return 0;
413 err:
414 mutex_unlock(&sel_mutex);
415
416 if (plm)
417 vfree(plm->data);
418 kfree(plm);
419 return rc;
420 }
421
422 static int sel_release_policy(struct inode *inode, struct file *filp)
423 {
424 struct policy_load_memory *plm = filp->private_data;
425
426 BUG_ON(!plm);
427
428 policy_opened = 0;
429
430 vfree(plm->data);
431 kfree(plm);
432
433 return 0;
434 }
435
436 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
437 size_t count, loff_t *ppos)
438 {
439 struct policy_load_memory *plm = filp->private_data;
440 int ret;
441
442 mutex_lock(&sel_mutex);
443
444 ret = task_has_security(current, SECURITY__READ_POLICY);
445 if (ret)
446 goto out;
447
448 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
449 out:
450 mutex_unlock(&sel_mutex);
451 return ret;
452 }
453
454 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
455 struct vm_fault *vmf)
456 {
457 struct policy_load_memory *plm = vma->vm_file->private_data;
458 unsigned long offset;
459 struct page *page;
460
461 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
462 return VM_FAULT_SIGBUS;
463
464 offset = vmf->pgoff << PAGE_SHIFT;
465 if (offset >= roundup(plm->len, PAGE_SIZE))
466 return VM_FAULT_SIGBUS;
467
468 page = vmalloc_to_page(plm->data + offset);
469 get_page(page);
470
471 vmf->page = page;
472
473 return 0;
474 }
475
476 static struct vm_operations_struct sel_mmap_policy_ops = {
477 .fault = sel_mmap_policy_fault,
478 .page_mkwrite = sel_mmap_policy_fault,
479 };
480
481 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
482 {
483 if (vma->vm_flags & VM_SHARED) {
484 /* do not allow mprotect to make mapping writable */
485 vma->vm_flags &= ~VM_MAYWRITE;
486
487 if (vma->vm_flags & VM_WRITE)
488 return -EACCES;
489 }
490
491 vma->vm_flags |= VM_RESERVED;
492 vma->vm_ops = &sel_mmap_policy_ops;
493
494 return 0;
495 }
496
497 static const struct file_operations sel_policy_ops = {
498 .open = sel_open_policy,
499 .read = sel_read_policy,
500 .mmap = sel_mmap_policy,
501 .release = sel_release_policy,
502 };
503
504 static ssize_t sel_write_load(struct file *file, const char __user *buf,
505 size_t count, loff_t *ppos)
506
507 {
508 ssize_t length;
509 void *data = NULL;
510
511 mutex_lock(&sel_mutex);
512
513 length = task_has_security(current, SECURITY__LOAD_POLICY);
514 if (length)
515 goto out;
516
517 /* No partial writes. */
518 length = -EINVAL;
519 if (*ppos != 0)
520 goto out;
521
522 length = -EFBIG;
523 if (count > 64 * 1024 * 1024)
524 goto out;
525
526 length = -ENOMEM;
527 data = vmalloc(count);
528 if (!data)
529 goto out;
530
531 length = -EFAULT;
532 if (copy_from_user(data, buf, count) != 0)
533 goto out;
534
535 length = security_load_policy(data, count);
536 if (length)
537 goto out;
538
539 length = sel_make_bools();
540 if (length)
541 goto out1;
542
543 length = sel_make_classes();
544 if (length)
545 goto out1;
546
547 length = sel_make_policycap();
548 if (length)
549 goto out1;
550
551 length = count;
552
553 out1:
554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
555 "policy loaded auid=%u ses=%u",
556 audit_get_loginuid(current),
557 audit_get_sessionid(current));
558 out:
559 mutex_unlock(&sel_mutex);
560 vfree(data);
561 return length;
562 }
563
564 static const struct file_operations sel_load_ops = {
565 .write = sel_write_load,
566 .llseek = generic_file_llseek,
567 };
568
569 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
570 {
571 char *canon = NULL;
572 u32 sid, len;
573 ssize_t length;
574
575 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
576 if (length)
577 goto out;
578
579 length = security_context_to_sid(buf, size, &sid);
580 if (length)
581 goto out;
582
583 length = security_sid_to_context(sid, &canon, &len);
584 if (length)
585 goto out;
586
587 length = -ERANGE;
588 if (len > SIMPLE_TRANSACTION_LIMIT) {
589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
591 goto out;
592 }
593
594 memcpy(buf, canon, len);
595 length = len;
596 out:
597 kfree(canon);
598 return length;
599 }
600
601 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
602 size_t count, loff_t *ppos)
603 {
604 char tmpbuf[TMPBUFLEN];
605 ssize_t length;
606
607 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
608 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
609 }
610
611 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
612 size_t count, loff_t *ppos)
613 {
614 char *page = NULL;
615 ssize_t length;
616 unsigned int new_value;
617
618 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
619 if (length)
620 goto out;
621
622 length = -ENOMEM;
623 if (count >= PAGE_SIZE)
624 goto out;
625
626 /* No partial writes. */
627 length = -EINVAL;
628 if (*ppos != 0)
629 goto out;
630
631 length = -ENOMEM;
632 page = (char *)get_zeroed_page(GFP_KERNEL);
633 if (!page)
634 goto out;
635
636 length = -EFAULT;
637 if (copy_from_user(page, buf, count))
638 goto out;
639
640 length = -EINVAL;
641 if (sscanf(page, "%u", &new_value) != 1)
642 goto out;
643
644 selinux_checkreqprot = new_value ? 1 : 0;
645 length = count;
646 out:
647 free_page((unsigned long) page);
648 return length;
649 }
650 static const struct file_operations sel_checkreqprot_ops = {
651 .read = sel_read_checkreqprot,
652 .write = sel_write_checkreqprot,
653 .llseek = generic_file_llseek,
654 };
655
656 /*
657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
658 */
659 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
664
665 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
666 [SEL_ACCESS] = sel_write_access,
667 [SEL_CREATE] = sel_write_create,
668 [SEL_RELABEL] = sel_write_relabel,
669 [SEL_USER] = sel_write_user,
670 [SEL_MEMBER] = sel_write_member,
671 [SEL_CONTEXT] = sel_write_context,
672 };
673
674 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
675 {
676 ino_t ino = file->f_path.dentry->d_inode->i_ino;
677 char *data;
678 ssize_t rv;
679
680 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
681 return -EINVAL;
682
683 data = simple_transaction_get(file, buf, size);
684 if (IS_ERR(data))
685 return PTR_ERR(data);
686
687 rv = write_op[ino](file, data, size);
688 if (rv > 0) {
689 simple_transaction_set(file, rv);
690 rv = size;
691 }
692 return rv;
693 }
694
695 static const struct file_operations transaction_ops = {
696 .write = selinux_transaction_write,
697 .read = simple_transaction_read,
698 .release = simple_transaction_release,
699 .llseek = generic_file_llseek,
700 };
701
702 /*
703 * payload - write methods
704 * If the method has a response, the response should be put in buf,
705 * and the length returned. Otherwise return 0 or and -error.
706 */
707
708 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
709 {
710 char *scon = NULL, *tcon = NULL;
711 u32 ssid, tsid;
712 u16 tclass;
713 struct av_decision avd;
714 ssize_t length;
715
716 length = task_has_security(current, SECURITY__COMPUTE_AV);
717 if (length)
718 goto out;
719
720 length = -ENOMEM;
721 scon = kzalloc(size + 1, GFP_KERNEL);
722 if (!scon)
723 goto out;
724
725 length = -ENOMEM;
726 tcon = kzalloc(size + 1, GFP_KERNEL);
727 if (!tcon)
728 goto out;
729
730 length = -EINVAL;
731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
732 goto out;
733
734 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
735 if (length)
736 goto out;
737
738 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
739 if (length)
740 goto out;
741
742 security_compute_av_user(ssid, tsid, tclass, &avd);
743
744 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
745 "%x %x %x %x %u %x",
746 avd.allowed, 0xffffffff,
747 avd.auditallow, avd.auditdeny,
748 avd.seqno, avd.flags);
749 out:
750 kfree(tcon);
751 kfree(scon);
752 return length;
753 }
754
755 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
756 {
757 char *scon = NULL, *tcon = NULL;
758 char *namebuf = NULL, *objname = NULL;
759 u32 ssid, tsid, newsid;
760 u16 tclass;
761 ssize_t length;
762 char *newcon = NULL;
763 u32 len;
764 int nargs;
765
766 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
767 if (length)
768 goto out;
769
770 length = -ENOMEM;
771 scon = kzalloc(size + 1, GFP_KERNEL);
772 if (!scon)
773 goto out;
774
775 length = -ENOMEM;
776 tcon = kzalloc(size + 1, GFP_KERNEL);
777 if (!tcon)
778 goto out;
779
780 length = -ENOMEM;
781 namebuf = kzalloc(size + 1, GFP_KERNEL);
782 if (!namebuf)
783 goto out;
784
785 length = -EINVAL;
786 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
787 if (nargs < 3 || nargs > 4)
788 goto out;
789 if (nargs == 4) {
790 /*
791 * If and when the name of new object to be queried contains
792 * either whitespace or multibyte characters, they shall be
793 * encoded based on the percentage-encoding rule.
794 * If not encoded, the sscanf logic picks up only left-half
795 * of the supplied name; splitted by a whitespace unexpectedly.
796 */
797 char *r, *w;
798 int c1, c2;
799
800 r = w = namebuf;
801 do {
802 c1 = *r++;
803 if (c1 == '+')
804 c1 = ' ';
805 else if (c1 == '%') {
806 c1 = hex_to_bin(*r++);
807 if (c1 < 0)
808 goto out;
809 c2 = hex_to_bin(*r++);
810 if (c2 < 0)
811 goto out;
812 c1 = (c1 << 4) | c2;
813 }
814 *w++ = c1;
815 } while (c1 != '\0');
816
817 objname = namebuf;
818 }
819
820 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
821 if (length)
822 goto out;
823
824 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
825 if (length)
826 goto out;
827
828 length = security_transition_sid_user(ssid, tsid, tclass,
829 objname, &newsid);
830 if (length)
831 goto out;
832
833 length = security_sid_to_context(newsid, &newcon, &len);
834 if (length)
835 goto out;
836
837 length = -ERANGE;
838 if (len > SIMPLE_TRANSACTION_LIMIT) {
839 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
840 "payload max\n", __func__, len);
841 goto out;
842 }
843
844 memcpy(buf, newcon, len);
845 length = len;
846 out:
847 kfree(newcon);
848 kfree(namebuf);
849 kfree(tcon);
850 kfree(scon);
851 return length;
852 }
853
854 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
855 {
856 char *scon = NULL, *tcon = NULL;
857 u32 ssid, tsid, newsid;
858 u16 tclass;
859 ssize_t length;
860 char *newcon = NULL;
861 u32 len;
862
863 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
864 if (length)
865 goto out;
866
867 length = -ENOMEM;
868 scon = kzalloc(size + 1, GFP_KERNEL);
869 if (!scon)
870 goto out;
871
872 length = -ENOMEM;
873 tcon = kzalloc(size + 1, GFP_KERNEL);
874 if (!tcon)
875 goto out;
876
877 length = -EINVAL;
878 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
879 goto out;
880
881 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
882 if (length)
883 goto out;
884
885 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
886 if (length)
887 goto out;
888
889 length = security_change_sid(ssid, tsid, tclass, &newsid);
890 if (length)
891 goto out;
892
893 length = security_sid_to_context(newsid, &newcon, &len);
894 if (length)
895 goto out;
896
897 length = -ERANGE;
898 if (len > SIMPLE_TRANSACTION_LIMIT)
899 goto out;
900
901 memcpy(buf, newcon, len);
902 length = len;
903 out:
904 kfree(newcon);
905 kfree(tcon);
906 kfree(scon);
907 return length;
908 }
909
910 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
911 {
912 char *con = NULL, *user = NULL, *ptr;
913 u32 sid, *sids = NULL;
914 ssize_t length;
915 char *newcon;
916 int i, rc;
917 u32 len, nsids;
918
919 length = task_has_security(current, SECURITY__COMPUTE_USER);
920 if (length)
921 goto out;
922
923 length = -ENOMEM;
924 con = kzalloc(size + 1, GFP_KERNEL);
925 if (!con)
926 goto out;
927
928 length = -ENOMEM;
929 user = kzalloc(size + 1, GFP_KERNEL);
930 if (!user)
931 goto out;
932
933 length = -EINVAL;
934 if (sscanf(buf, "%s %s", con, user) != 2)
935 goto out;
936
937 length = security_context_to_sid(con, strlen(con) + 1, &sid);
938 if (length)
939 goto out;
940
941 length = security_get_user_sids(sid, user, &sids, &nsids);
942 if (length)
943 goto out;
944
945 length = sprintf(buf, "%u", nsids) + 1;
946 ptr = buf + length;
947 for (i = 0; i < nsids; i++) {
948 rc = security_sid_to_context(sids[i], &newcon, &len);
949 if (rc) {
950 length = rc;
951 goto out;
952 }
953 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
954 kfree(newcon);
955 length = -ERANGE;
956 goto out;
957 }
958 memcpy(ptr, newcon, len);
959 kfree(newcon);
960 ptr += len;
961 length += len;
962 }
963 out:
964 kfree(sids);
965 kfree(user);
966 kfree(con);
967 return length;
968 }
969
970 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
971 {
972 char *scon = NULL, *tcon = NULL;
973 u32 ssid, tsid, newsid;
974 u16 tclass;
975 ssize_t length;
976 char *newcon = NULL;
977 u32 len;
978
979 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
980 if (length)
981 goto out;
982
983 length = -ENOMEM;
984 scon = kzalloc(size + 1, GFP_KERNEL);
985 if (!scon)
986 goto out;
987
988 length = -ENOMEM;
989 tcon = kzalloc(size + 1, GFP_KERNEL);
990 if (!tcon)
991 goto out;
992
993 length = -EINVAL;
994 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
995 goto out;
996
997 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
998 if (length)
999 goto out;
1000
1001 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
1002 if (length)
1003 goto out;
1004
1005 length = security_member_sid(ssid, tsid, tclass, &newsid);
1006 if (length)
1007 goto out;
1008
1009 length = security_sid_to_context(newsid, &newcon, &len);
1010 if (length)
1011 goto out;
1012
1013 length = -ERANGE;
1014 if (len > SIMPLE_TRANSACTION_LIMIT) {
1015 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1016 "payload max\n", __func__, len);
1017 goto out;
1018 }
1019
1020 memcpy(buf, newcon, len);
1021 length = len;
1022 out:
1023 kfree(newcon);
1024 kfree(tcon);
1025 kfree(scon);
1026 return length;
1027 }
1028
1029 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1030 {
1031 struct inode *ret = new_inode(sb);
1032
1033 if (ret) {
1034 ret->i_mode = mode;
1035 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1036 }
1037 return ret;
1038 }
1039
1040 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1041 size_t count, loff_t *ppos)
1042 {
1043 char *page = NULL;
1044 ssize_t length;
1045 ssize_t ret;
1046 int cur_enforcing;
1047 struct inode *inode = filep->f_path.dentry->d_inode;
1048 unsigned index = inode->i_ino & SEL_INO_MASK;
1049 const char *name = filep->f_path.dentry->d_name.name;
1050
1051 mutex_lock(&sel_mutex);
1052
1053 ret = -EINVAL;
1054 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1055 goto out;
1056
1057 ret = -ENOMEM;
1058 page = (char *)get_zeroed_page(GFP_KERNEL);
1059 if (!page)
1060 goto out;
1061
1062 cur_enforcing = security_get_bool_value(index);
1063 if (cur_enforcing < 0) {
1064 ret = cur_enforcing;
1065 goto out;
1066 }
1067 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1068 bool_pending_values[index]);
1069 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1070 out:
1071 mutex_unlock(&sel_mutex);
1072 free_page((unsigned long)page);
1073 return ret;
1074 }
1075
1076 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1077 size_t count, loff_t *ppos)
1078 {
1079 char *page = NULL;
1080 ssize_t length;
1081 int new_value;
1082 struct inode *inode = filep->f_path.dentry->d_inode;
1083 unsigned index = inode->i_ino & SEL_INO_MASK;
1084 const char *name = filep->f_path.dentry->d_name.name;
1085
1086 mutex_lock(&sel_mutex);
1087
1088 length = task_has_security(current, SECURITY__SETBOOL);
1089 if (length)
1090 goto out;
1091
1092 length = -EINVAL;
1093 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1094 goto out;
1095
1096 length = -ENOMEM;
1097 if (count >= PAGE_SIZE)
1098 goto out;
1099
1100 /* No partial writes. */
1101 length = -EINVAL;
1102 if (*ppos != 0)
1103 goto out;
1104
1105 length = -ENOMEM;
1106 page = (char *)get_zeroed_page(GFP_KERNEL);
1107 if (!page)
1108 goto out;
1109
1110 length = -EFAULT;
1111 if (copy_from_user(page, buf, count))
1112 goto out;
1113
1114 length = -EINVAL;
1115 if (sscanf(page, "%d", &new_value) != 1)
1116 goto out;
1117
1118 if (new_value)
1119 new_value = 1;
1120
1121 bool_pending_values[index] = new_value;
1122 length = count;
1123
1124 out:
1125 mutex_unlock(&sel_mutex);
1126 free_page((unsigned long) page);
1127 return length;
1128 }
1129
1130 static const struct file_operations sel_bool_ops = {
1131 .read = sel_read_bool,
1132 .write = sel_write_bool,
1133 .llseek = generic_file_llseek,
1134 };
1135
1136 static ssize_t sel_commit_bools_write(struct file *filep,
1137 const char __user *buf,
1138 size_t count, loff_t *ppos)
1139 {
1140 char *page = NULL;
1141 ssize_t length;
1142 int new_value;
1143
1144 mutex_lock(&sel_mutex);
1145
1146 length = task_has_security(current, SECURITY__SETBOOL);
1147 if (length)
1148 goto out;
1149
1150 length = -ENOMEM;
1151 if (count >= PAGE_SIZE)
1152 goto out;
1153
1154 /* No partial writes. */
1155 length = -EINVAL;
1156 if (*ppos != 0)
1157 goto out;
1158
1159 length = -ENOMEM;
1160 page = (char *)get_zeroed_page(GFP_KERNEL);
1161 if (!page)
1162 goto out;
1163
1164 length = -EFAULT;
1165 if (copy_from_user(page, buf, count))
1166 goto out;
1167
1168 length = -EINVAL;
1169 if (sscanf(page, "%d", &new_value) != 1)
1170 goto out;
1171
1172 length = 0;
1173 if (new_value && bool_pending_values)
1174 length = security_set_bools(bool_num, bool_pending_values);
1175
1176 if (!length)
1177 length = count;
1178
1179 out:
1180 mutex_unlock(&sel_mutex);
1181 free_page((unsigned long) page);
1182 return length;
1183 }
1184
1185 static const struct file_operations sel_commit_bools_ops = {
1186 .write = sel_commit_bools_write,
1187 .llseek = generic_file_llseek,
1188 };
1189
1190 static void sel_remove_entries(struct dentry *de)
1191 {
1192 struct list_head *node;
1193
1194 spin_lock(&de->d_lock);
1195 node = de->d_subdirs.next;
1196 while (node != &de->d_subdirs) {
1197 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1198
1199 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1200 list_del_init(node);
1201
1202 if (d->d_inode) {
1203 dget_dlock(d);
1204 spin_unlock(&de->d_lock);
1205 spin_unlock(&d->d_lock);
1206 d_delete(d);
1207 simple_unlink(de->d_inode, d);
1208 dput(d);
1209 spin_lock(&de->d_lock);
1210 } else
1211 spin_unlock(&d->d_lock);
1212 node = de->d_subdirs.next;
1213 }
1214
1215 spin_unlock(&de->d_lock);
1216 }
1217
1218 #define BOOL_DIR_NAME "booleans"
1219
1220 static int sel_make_bools(void)
1221 {
1222 int i, ret;
1223 ssize_t len;
1224 struct dentry *dentry = NULL;
1225 struct dentry *dir = bool_dir;
1226 struct inode *inode = NULL;
1227 struct inode_security_struct *isec;
1228 char **names = NULL, *page;
1229 int num;
1230 int *values = NULL;
1231 u32 sid;
1232
1233 /* remove any existing files */
1234 for (i = 0; i < bool_num; i++)
1235 kfree(bool_pending_names[i]);
1236 kfree(bool_pending_names);
1237 kfree(bool_pending_values);
1238 bool_pending_names = NULL;
1239 bool_pending_values = NULL;
1240
1241 sel_remove_entries(dir);
1242
1243 ret = -ENOMEM;
1244 page = (char *)get_zeroed_page(GFP_KERNEL);
1245 if (!page)
1246 goto out;
1247
1248 ret = security_get_bools(&num, &names, &values);
1249 if (ret)
1250 goto out;
1251
1252 for (i = 0; i < num; i++) {
1253 ret = -ENOMEM;
1254 dentry = d_alloc_name(dir, names[i]);
1255 if (!dentry)
1256 goto out;
1257
1258 ret = -ENOMEM;
1259 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1260 if (!inode)
1261 goto out;
1262
1263 ret = -EINVAL;
1264 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1265 if (len < 0)
1266 goto out;
1267
1268 ret = -ENAMETOOLONG;
1269 if (len >= PAGE_SIZE)
1270 goto out;
1271
1272 isec = (struct inode_security_struct *)inode->i_security;
1273 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1274 if (ret)
1275 goto out;
1276
1277 isec->sid = sid;
1278 isec->initialized = 1;
1279 inode->i_fop = &sel_bool_ops;
1280 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1281 d_add(dentry, inode);
1282 }
1283 bool_num = num;
1284 bool_pending_names = names;
1285 bool_pending_values = values;
1286
1287 free_page((unsigned long)page);
1288 return 0;
1289 out:
1290 free_page((unsigned long)page);
1291
1292 if (names) {
1293 for (i = 0; i < num; i++)
1294 kfree(names[i]);
1295 kfree(names);
1296 }
1297 kfree(values);
1298 sel_remove_entries(dir);
1299
1300 return ret;
1301 }
1302
1303 #define NULL_FILE_NAME "null"
1304
1305 struct dentry *selinux_null;
1306
1307 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1308 size_t count, loff_t *ppos)
1309 {
1310 char tmpbuf[TMPBUFLEN];
1311 ssize_t length;
1312
1313 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1314 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1315 }
1316
1317 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1318 const char __user *buf,
1319 size_t count, loff_t *ppos)
1320
1321 {
1322 char *page = NULL;
1323 ssize_t ret;
1324 int new_value;
1325
1326 ret = task_has_security(current, SECURITY__SETSECPARAM);
1327 if (ret)
1328 goto out;
1329
1330 ret = -ENOMEM;
1331 if (count >= PAGE_SIZE)
1332 goto out;
1333
1334 /* No partial writes. */
1335 ret = -EINVAL;
1336 if (*ppos != 0)
1337 goto out;
1338
1339 ret = -ENOMEM;
1340 page = (char *)get_zeroed_page(GFP_KERNEL);
1341 if (!page)
1342 goto out;
1343
1344 ret = -EFAULT;
1345 if (copy_from_user(page, buf, count))
1346 goto out;
1347
1348 ret = -EINVAL;
1349 if (sscanf(page, "%u", &new_value) != 1)
1350 goto out;
1351
1352 avc_cache_threshold = new_value;
1353
1354 ret = count;
1355 out:
1356 free_page((unsigned long)page);
1357 return ret;
1358 }
1359
1360 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1361 size_t count, loff_t *ppos)
1362 {
1363 char *page;
1364 ssize_t length;
1365
1366 page = (char *)__get_free_page(GFP_KERNEL);
1367 if (!page)
1368 return -ENOMEM;
1369
1370 length = avc_get_hash_stats(page);
1371 if (length >= 0)
1372 length = simple_read_from_buffer(buf, count, ppos, page, length);
1373 free_page((unsigned long)page);
1374
1375 return length;
1376 }
1377
1378 static const struct file_operations sel_avc_cache_threshold_ops = {
1379 .read = sel_read_avc_cache_threshold,
1380 .write = sel_write_avc_cache_threshold,
1381 .llseek = generic_file_llseek,
1382 };
1383
1384 static const struct file_operations sel_avc_hash_stats_ops = {
1385 .read = sel_read_avc_hash_stats,
1386 .llseek = generic_file_llseek,
1387 };
1388
1389 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1390 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1391 {
1392 int cpu;
1393
1394 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1395 if (!cpu_possible(cpu))
1396 continue;
1397 *idx = cpu + 1;
1398 return &per_cpu(avc_cache_stats, cpu);
1399 }
1400 return NULL;
1401 }
1402
1403 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1404 {
1405 loff_t n = *pos - 1;
1406
1407 if (*pos == 0)
1408 return SEQ_START_TOKEN;
1409
1410 return sel_avc_get_stat_idx(&n);
1411 }
1412
1413 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1414 {
1415 return sel_avc_get_stat_idx(pos);
1416 }
1417
1418 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1419 {
1420 struct avc_cache_stats *st = v;
1421
1422 if (v == SEQ_START_TOKEN)
1423 seq_printf(seq, "lookups hits misses allocations reclaims "
1424 "frees\n");
1425 else {
1426 unsigned int lookups = st->lookups;
1427 unsigned int misses = st->misses;
1428 unsigned int hits = lookups - misses;
1429 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1430 hits, misses, st->allocations,
1431 st->reclaims, st->frees);
1432 }
1433 return 0;
1434 }
1435
1436 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1437 { }
1438
1439 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1440 .start = sel_avc_stats_seq_start,
1441 .next = sel_avc_stats_seq_next,
1442 .show = sel_avc_stats_seq_show,
1443 .stop = sel_avc_stats_seq_stop,
1444 };
1445
1446 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1447 {
1448 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1449 }
1450
1451 static const struct file_operations sel_avc_cache_stats_ops = {
1452 .open = sel_open_avc_cache_stats,
1453 .read = seq_read,
1454 .llseek = seq_lseek,
1455 .release = seq_release,
1456 };
1457 #endif
1458
1459 static int sel_make_avc_files(struct dentry *dir)
1460 {
1461 int i;
1462 static struct tree_descr files[] = {
1463 { "cache_threshold",
1464 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1465 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1466 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1467 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1468 #endif
1469 };
1470
1471 for (i = 0; i < ARRAY_SIZE(files); i++) {
1472 struct inode *inode;
1473 struct dentry *dentry;
1474
1475 dentry = d_alloc_name(dir, files[i].name);
1476 if (!dentry)
1477 return -ENOMEM;
1478
1479 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1480 if (!inode)
1481 return -ENOMEM;
1482
1483 inode->i_fop = files[i].ops;
1484 inode->i_ino = ++sel_last_ino;
1485 d_add(dentry, inode);
1486 }
1487
1488 return 0;
1489 }
1490
1491 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1492 size_t count, loff_t *ppos)
1493 {
1494 struct inode *inode;
1495 char *con;
1496 u32 sid, len;
1497 ssize_t ret;
1498
1499 inode = file->f_path.dentry->d_inode;
1500 sid = inode->i_ino&SEL_INO_MASK;
1501 ret = security_sid_to_context(sid, &con, &len);
1502 if (ret)
1503 return ret;
1504
1505 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1506 kfree(con);
1507 return ret;
1508 }
1509
1510 static const struct file_operations sel_initcon_ops = {
1511 .read = sel_read_initcon,
1512 .llseek = generic_file_llseek,
1513 };
1514
1515 static int sel_make_initcon_files(struct dentry *dir)
1516 {
1517 int i;
1518
1519 for (i = 1; i <= SECINITSID_NUM; i++) {
1520 struct inode *inode;
1521 struct dentry *dentry;
1522 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1523 if (!dentry)
1524 return -ENOMEM;
1525
1526 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1527 if (!inode)
1528 return -ENOMEM;
1529
1530 inode->i_fop = &sel_initcon_ops;
1531 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1532 d_add(dentry, inode);
1533 }
1534
1535 return 0;
1536 }
1537
1538 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1539 {
1540 return a / b - (a % b < 0);
1541 }
1542
1543 static inline unsigned long sel_class_to_ino(u16 class)
1544 {
1545 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1546 }
1547
1548 static inline u16 sel_ino_to_class(unsigned long ino)
1549 {
1550 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1551 }
1552
1553 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1554 {
1555 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1556 }
1557
1558 static inline u32 sel_ino_to_perm(unsigned long ino)
1559 {
1560 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1561 }
1562
1563 static ssize_t sel_read_class(struct file *file, char __user *buf,
1564 size_t count, loff_t *ppos)
1565 {
1566 ssize_t rc, len;
1567 char *page;
1568 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1569
1570 page = (char *)__get_free_page(GFP_KERNEL);
1571 if (!page)
1572 return -ENOMEM;
1573
1574 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1575 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1576 free_page((unsigned long)page);
1577
1578 return rc;
1579 }
1580
1581 static const struct file_operations sel_class_ops = {
1582 .read = sel_read_class,
1583 .llseek = generic_file_llseek,
1584 };
1585
1586 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1587 size_t count, loff_t *ppos)
1588 {
1589 ssize_t rc, len;
1590 char *page;
1591 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1592
1593 page = (char *)__get_free_page(GFP_KERNEL);
1594 if (!page)
1595 return -ENOMEM;
1596
1597 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1598 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1599 free_page((unsigned long)page);
1600
1601 return rc;
1602 }
1603
1604 static const struct file_operations sel_perm_ops = {
1605 .read = sel_read_perm,
1606 .llseek = generic_file_llseek,
1607 };
1608
1609 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1610 size_t count, loff_t *ppos)
1611 {
1612 int value;
1613 char tmpbuf[TMPBUFLEN];
1614 ssize_t length;
1615 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1616
1617 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1618 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1619
1620 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1621 }
1622
1623 static const struct file_operations sel_policycap_ops = {
1624 .read = sel_read_policycap,
1625 .llseek = generic_file_llseek,
1626 };
1627
1628 static int sel_make_perm_files(char *objclass, int classvalue,
1629 struct dentry *dir)
1630 {
1631 int i, rc, nperms;
1632 char **perms;
1633
1634 rc = security_get_permissions(objclass, &perms, &nperms);
1635 if (rc)
1636 return rc;
1637
1638 for (i = 0; i < nperms; i++) {
1639 struct inode *inode;
1640 struct dentry *dentry;
1641
1642 rc = -ENOMEM;
1643 dentry = d_alloc_name(dir, perms[i]);
1644 if (!dentry)
1645 goto out;
1646
1647 rc = -ENOMEM;
1648 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1649 if (!inode)
1650 goto out;
1651
1652 inode->i_fop = &sel_perm_ops;
1653 /* i+1 since perm values are 1-indexed */
1654 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1655 d_add(dentry, inode);
1656 }
1657 rc = 0;
1658 out:
1659 for (i = 0; i < nperms; i++)
1660 kfree(perms[i]);
1661 kfree(perms);
1662 return rc;
1663 }
1664
1665 static int sel_make_class_dir_entries(char *classname, int index,
1666 struct dentry *dir)
1667 {
1668 struct dentry *dentry = NULL;
1669 struct inode *inode = NULL;
1670 int rc;
1671
1672 dentry = d_alloc_name(dir, "index");
1673 if (!dentry)
1674 return -ENOMEM;
1675
1676 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1677 if (!inode)
1678 return -ENOMEM;
1679
1680 inode->i_fop = &sel_class_ops;
1681 inode->i_ino = sel_class_to_ino(index);
1682 d_add(dentry, inode);
1683
1684 dentry = d_alloc_name(dir, "perms");
1685 if (!dentry)
1686 return -ENOMEM;
1687
1688 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1689 if (rc)
1690 return rc;
1691
1692 rc = sel_make_perm_files(classname, index, dentry);
1693
1694 return rc;
1695 }
1696
1697 static void sel_remove_classes(void)
1698 {
1699 struct list_head *class_node;
1700
1701 list_for_each(class_node, &class_dir->d_subdirs) {
1702 struct dentry *class_subdir = list_entry(class_node,
1703 struct dentry, d_u.d_child);
1704 struct list_head *class_subdir_node;
1705
1706 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1707 struct dentry *d = list_entry(class_subdir_node,
1708 struct dentry, d_u.d_child);
1709
1710 if (d->d_inode)
1711 if (d->d_inode->i_mode & S_IFDIR)
1712 sel_remove_entries(d);
1713 }
1714
1715 sel_remove_entries(class_subdir);
1716 }
1717
1718 sel_remove_entries(class_dir);
1719 }
1720
1721 static int sel_make_classes(void)
1722 {
1723 int rc, nclasses, i;
1724 char **classes;
1725
1726 /* delete any existing entries */
1727 sel_remove_classes();
1728
1729 rc = security_get_classes(&classes, &nclasses);
1730 if (rc)
1731 return rc;
1732
1733 /* +2 since classes are 1-indexed */
1734 last_class_ino = sel_class_to_ino(nclasses + 2);
1735
1736 for (i = 0; i < nclasses; i++) {
1737 struct dentry *class_name_dir;
1738
1739 rc = -ENOMEM;
1740 class_name_dir = d_alloc_name(class_dir, classes[i]);
1741 if (!class_name_dir)
1742 goto out;
1743
1744 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1745 &last_class_ino);
1746 if (rc)
1747 goto out;
1748
1749 /* i+1 since class values are 1-indexed */
1750 rc = sel_make_class_dir_entries(classes[i], i + 1,
1751 class_name_dir);
1752 if (rc)
1753 goto out;
1754 }
1755 rc = 0;
1756 out:
1757 for (i = 0; i < nclasses; i++)
1758 kfree(classes[i]);
1759 kfree(classes);
1760 return rc;
1761 }
1762
1763 static int sel_make_policycap(void)
1764 {
1765 unsigned int iter;
1766 struct dentry *dentry = NULL;
1767 struct inode *inode = NULL;
1768
1769 sel_remove_entries(policycap_dir);
1770
1771 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1772 if (iter < ARRAY_SIZE(policycap_names))
1773 dentry = d_alloc_name(policycap_dir,
1774 policycap_names[iter]);
1775 else
1776 dentry = d_alloc_name(policycap_dir, "unknown");
1777
1778 if (dentry == NULL)
1779 return -ENOMEM;
1780
1781 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1782 if (inode == NULL)
1783 return -ENOMEM;
1784
1785 inode->i_fop = &sel_policycap_ops;
1786 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1787 d_add(dentry, inode);
1788 }
1789
1790 return 0;
1791 }
1792
1793 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1794 unsigned long *ino)
1795 {
1796 struct inode *inode;
1797
1798 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1799 if (!inode)
1800 return -ENOMEM;
1801
1802 inode->i_op = &simple_dir_inode_operations;
1803 inode->i_fop = &simple_dir_operations;
1804 inode->i_ino = ++(*ino);
1805 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1806 inc_nlink(inode);
1807 d_add(dentry, inode);
1808 /* bump link count on parent directory, too */
1809 inc_nlink(dir);
1810
1811 return 0;
1812 }
1813
1814 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1815 {
1816 int ret;
1817 struct dentry *dentry;
1818 struct inode *inode, *root_inode;
1819 struct inode_security_struct *isec;
1820
1821 static struct tree_descr selinux_files[] = {
1822 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1823 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1824 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1825 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1826 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1827 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1828 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1829 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1830 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1831 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1832 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1833 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1834 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1835 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1836 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1837 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1838 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1839 /* last one */ {""}
1840 };
1841 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1842 if (ret)
1843 goto err;
1844
1845 root_inode = sb->s_root->d_inode;
1846
1847 ret = -ENOMEM;
1848 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1849 if (!dentry)
1850 goto err;
1851
1852 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1853 if (ret)
1854 goto err;
1855
1856 bool_dir = dentry;
1857
1858 ret = -ENOMEM;
1859 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1860 if (!dentry)
1861 goto err;
1862
1863 ret = -ENOMEM;
1864 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1865 if (!inode)
1866 goto err;
1867
1868 inode->i_ino = ++sel_last_ino;
1869 isec = (struct inode_security_struct *)inode->i_security;
1870 isec->sid = SECINITSID_DEVNULL;
1871 isec->sclass = SECCLASS_CHR_FILE;
1872 isec->initialized = 1;
1873
1874 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1875 d_add(dentry, inode);
1876 selinux_null = dentry;
1877
1878 ret = -ENOMEM;
1879 dentry = d_alloc_name(sb->s_root, "avc");
1880 if (!dentry)
1881 goto err;
1882
1883 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1884 if (ret)
1885 goto err;
1886
1887 ret = sel_make_avc_files(dentry);
1888 if (ret)
1889 goto err;
1890
1891 ret = -ENOMEM;
1892 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1893 if (!dentry)
1894 goto err;
1895
1896 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1897 if (ret)
1898 goto err;
1899
1900 ret = sel_make_initcon_files(dentry);
1901 if (ret)
1902 goto err;
1903
1904 ret = -ENOMEM;
1905 dentry = d_alloc_name(sb->s_root, "class");
1906 if (!dentry)
1907 goto err;
1908
1909 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1910 if (ret)
1911 goto err;
1912
1913 class_dir = dentry;
1914
1915 ret = -ENOMEM;
1916 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1917 if (!dentry)
1918 goto err;
1919
1920 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1921 if (ret)
1922 goto err;
1923
1924 policycap_dir = dentry;
1925
1926 return 0;
1927 err:
1928 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1929 __func__);
1930 return ret;
1931 }
1932
1933 static struct dentry *sel_mount(struct file_system_type *fs_type,
1934 int flags, const char *dev_name, void *data)
1935 {
1936 return mount_single(fs_type, flags, data, sel_fill_super);
1937 }
1938
1939 static struct file_system_type sel_fs_type = {
1940 .name = "selinuxfs",
1941 .mount = sel_mount,
1942 .kill_sb = kill_litter_super,
1943 };
1944
1945 struct vfsmount *selinuxfs_mount;
1946 static struct kobject *selinuxfs_kobj;
1947
1948 static int __init init_sel_fs(void)
1949 {
1950 int err;
1951
1952 if (!selinux_enabled)
1953 return 0;
1954
1955 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1956 if (!selinuxfs_kobj)
1957 return -ENOMEM;
1958
1959 err = register_filesystem(&sel_fs_type);
1960 if (err) {
1961 kobject_put(selinuxfs_kobj);
1962 return err;
1963 }
1964
1965 selinuxfs_mount = kern_mount(&sel_fs_type);
1966 if (IS_ERR(selinuxfs_mount)) {
1967 printk(KERN_ERR "selinuxfs: could not mount!\n");
1968 err = PTR_ERR(selinuxfs_mount);
1969 selinuxfs_mount = NULL;
1970 }
1971
1972 return err;
1973 }
1974
1975 __initcall(init_sel_fs);
1976
1977 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1978 void exit_sel_fs(void)
1979 {
1980 kobject_put(selinuxfs_kobj);
1981 kern_unmount(selinuxfs_mount);
1982 unregister_filesystem(&sel_fs_type);
1983 }
1984 #endif
linux-next