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net: vrf: Do not allow looback to be moved to a VRF
[linux-2.6/btrfs-unstable.git] / security / selinux / selinuxfs.c
blobcb3fd98fb05ae7df77b2ad20bf640d38b5133123
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 "extended_socket_class",
49 "always_check_network",
50 "cgroup_seclabel"
51 };
52
53 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
54
55 static int __init checkreqprot_setup(char *str)
56 {
57 unsigned long checkreqprot;
58 if (!kstrtoul(str, 0, &checkreqprot))
59 selinux_checkreqprot = checkreqprot ? 1 : 0;
60 return 1;
61 }
62 __setup("checkreqprot=", checkreqprot_setup);
63
64 static DEFINE_MUTEX(sel_mutex);
65
66 /* global data for booleans */
67 static struct dentry *bool_dir;
68 static int bool_num;
69 static char **bool_pending_names;
70 static int *bool_pending_values;
71
72 /* global data for classes */
73 static struct dentry *class_dir;
74 static unsigned long last_class_ino;
75
76 static char policy_opened;
77
78 /* global data for policy capabilities */
79 static struct dentry *policycap_dir;
80
81 enum sel_inos {
82 SEL_ROOT_INO = 2,
83 SEL_LOAD, /* load policy */
84 SEL_ENFORCE, /* get or set enforcing status */
85 SEL_CONTEXT, /* validate context */
86 SEL_ACCESS, /* compute access decision */
87 SEL_CREATE, /* compute create labeling decision */
88 SEL_RELABEL, /* compute relabeling decision */
89 SEL_USER, /* compute reachable user contexts */
90 SEL_POLICYVERS, /* return policy version for this kernel */
91 SEL_COMMIT_BOOLS, /* commit new boolean values */
92 SEL_MLS, /* return if MLS policy is enabled */
93 SEL_DISABLE, /* disable SELinux until next reboot */
94 SEL_MEMBER, /* compute polyinstantiation membership decision */
95 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
96 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
97 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
98 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
99 SEL_STATUS, /* export current status using mmap() */
100 SEL_POLICY, /* allow userspace to read the in kernel policy */
101 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
102 SEL_INO_NEXT, /* The next inode number to use */
103 };
104
105 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
106
107 #define SEL_INITCON_INO_OFFSET 0x01000000
108 #define SEL_BOOL_INO_OFFSET 0x02000000
109 #define SEL_CLASS_INO_OFFSET 0x04000000
110 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
111 #define SEL_INO_MASK 0x00ffffff
112
113 #define TMPBUFLEN 12
114 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
115 size_t count, loff_t *ppos)
116 {
117 char tmpbuf[TMPBUFLEN];
118 ssize_t length;
119
120 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
121 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
122 }
123
124 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
125 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
126 size_t count, loff_t *ppos)
127
128 {
129 char *page = NULL;
130 ssize_t length;
131 int new_value;
132
133 if (count >= PAGE_SIZE)
134 return -ENOMEM;
135
136 /* No partial writes. */
137 if (*ppos != 0)
138 return -EINVAL;
139
140 page = memdup_user_nul(buf, count);
141 if (IS_ERR(page))
142 return PTR_ERR(page);
143
144 length = -EINVAL;
145 if (sscanf(page, "%d", &new_value) != 1)
146 goto out;
147
148 new_value = !!new_value;
149
150 if (new_value != selinux_enforcing) {
151 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
152 SECCLASS_SECURITY, SECURITY__SETENFORCE,
153 NULL);
154 if (length)
155 goto out;
156 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
157 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
158 new_value, selinux_enforcing,
159 from_kuid(&init_user_ns, audit_get_loginuid(current)),
160 audit_get_sessionid(current));
161 selinux_enforcing = new_value;
162 if (selinux_enforcing)
163 avc_ss_reset(0);
164 selnl_notify_setenforce(selinux_enforcing);
165 selinux_status_update_setenforce(selinux_enforcing);
166 }
167 length = count;
168 out:
169 kfree(page);
170 return length;
171 }
172 #else
173 #define sel_write_enforce NULL
174 #endif
175
176 static const struct file_operations sel_enforce_ops = {
177 .read = sel_read_enforce,
178 .write = sel_write_enforce,
179 .llseek = generic_file_llseek,
180 };
181
182 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
183 size_t count, loff_t *ppos)
184 {
185 char tmpbuf[TMPBUFLEN];
186 ssize_t length;
187 ino_t ino = file_inode(filp)->i_ino;
188 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
189 security_get_reject_unknown() : !security_get_allow_unknown();
190
191 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
192 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
193 }
194
195 static const struct file_operations sel_handle_unknown_ops = {
196 .read = sel_read_handle_unknown,
197 .llseek = generic_file_llseek,
198 };
199
200 static int sel_open_handle_status(struct inode *inode, struct file *filp)
201 {
202 struct page *status = selinux_kernel_status_page();
203
204 if (!status)
205 return -ENOMEM;
206
207 filp->private_data = status;
208
209 return 0;
210 }
211
212 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
213 size_t count, loff_t *ppos)
214 {
215 struct page *status = filp->private_data;
216
217 BUG_ON(!status);
218
219 return simple_read_from_buffer(buf, count, ppos,
220 page_address(status),
221 sizeof(struct selinux_kernel_status));
222 }
223
224 static int sel_mmap_handle_status(struct file *filp,
225 struct vm_area_struct *vma)
226 {
227 struct page *status = filp->private_data;
228 unsigned long size = vma->vm_end - vma->vm_start;
229
230 BUG_ON(!status);
231
232 /* only allows one page from the head */
233 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
234 return -EIO;
235 /* disallow writable mapping */
236 if (vma->vm_flags & VM_WRITE)
237 return -EPERM;
238 /* disallow mprotect() turns it into writable */
239 vma->vm_flags &= ~VM_MAYWRITE;
240
241 return remap_pfn_range(vma, vma->vm_start,
242 page_to_pfn(status),
243 size, vma->vm_page_prot);
244 }
245
246 static const struct file_operations sel_handle_status_ops = {
247 .open = sel_open_handle_status,
248 .read = sel_read_handle_status,
249 .mmap = sel_mmap_handle_status,
250 .llseek = generic_file_llseek,
251 };
252
253 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
254 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
255 size_t count, loff_t *ppos)
256
257 {
258 char *page;
259 ssize_t length;
260 int new_value;
261
262 if (count >= PAGE_SIZE)
263 return -ENOMEM;
264
265 /* No partial writes. */
266 if (*ppos != 0)
267 return -EINVAL;
268
269 page = memdup_user_nul(buf, count);
270 if (IS_ERR(page))
271 return PTR_ERR(page);
272
273 length = -EINVAL;
274 if (sscanf(page, "%d", &new_value) != 1)
275 goto out;
276
277 if (new_value) {
278 length = selinux_disable();
279 if (length)
280 goto out;
281 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
282 "selinux=0 auid=%u ses=%u",
283 from_kuid(&init_user_ns, audit_get_loginuid(current)),
284 audit_get_sessionid(current));
285 }
286
287 length = count;
288 out:
289 kfree(page);
290 return length;
291 }
292 #else
293 #define sel_write_disable NULL
294 #endif
295
296 static const struct file_operations sel_disable_ops = {
297 .write = sel_write_disable,
298 .llseek = generic_file_llseek,
299 };
300
301 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
302 size_t count, loff_t *ppos)
303 {
304 char tmpbuf[TMPBUFLEN];
305 ssize_t length;
306
307 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
308 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
309 }
310
311 static const struct file_operations sel_policyvers_ops = {
312 .read = sel_read_policyvers,
313 .llseek = generic_file_llseek,
314 };
315
316 /* declaration for sel_write_load */
317 static int sel_make_bools(void);
318 static int sel_make_classes(void);
319 static int sel_make_policycap(void);
320
321 /* declaration for sel_make_class_dirs */
322 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
323 unsigned long *ino);
324
325 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
326 size_t count, loff_t *ppos)
327 {
328 char tmpbuf[TMPBUFLEN];
329 ssize_t length;
330
331 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
332 security_mls_enabled());
333 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
334 }
335
336 static const struct file_operations sel_mls_ops = {
337 .read = sel_read_mls,
338 .llseek = generic_file_llseek,
339 };
340
341 struct policy_load_memory {
342 size_t len;
343 void *data;
344 };
345
346 static int sel_open_policy(struct inode *inode, struct file *filp)
347 {
348 struct policy_load_memory *plm = NULL;
349 int rc;
350
351 BUG_ON(filp->private_data);
352
353 mutex_lock(&sel_mutex);
354
355 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
356 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
357 if (rc)
358 goto err;
359
360 rc = -EBUSY;
361 if (policy_opened)
362 goto err;
363
364 rc = -ENOMEM;
365 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
366 if (!plm)
367 goto err;
368
369 if (i_size_read(inode) != security_policydb_len()) {
370 inode_lock(inode);
371 i_size_write(inode, security_policydb_len());
372 inode_unlock(inode);
373 }
374
375 rc = security_read_policy(&plm->data, &plm->len);
376 if (rc)
377 goto err;
378
379 policy_opened = 1;
380
381 filp->private_data = plm;
382
383 mutex_unlock(&sel_mutex);
384
385 return 0;
386 err:
387 mutex_unlock(&sel_mutex);
388
389 if (plm)
390 vfree(plm->data);
391 kfree(plm);
392 return rc;
393 }
394
395 static int sel_release_policy(struct inode *inode, struct file *filp)
396 {
397 struct policy_load_memory *plm = filp->private_data;
398
399 BUG_ON(!plm);
400
401 policy_opened = 0;
402
403 vfree(plm->data);
404 kfree(plm);
405
406 return 0;
407 }
408
409 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
410 size_t count, loff_t *ppos)
411 {
412 struct policy_load_memory *plm = filp->private_data;
413 int ret;
414
415 mutex_lock(&sel_mutex);
416
417 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
418 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
419 if (ret)
420 goto out;
421
422 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
423 out:
424 mutex_unlock(&sel_mutex);
425 return ret;
426 }
427
428 static int sel_mmap_policy_fault(struct vm_fault *vmf)
429 {
430 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
431 unsigned long offset;
432 struct page *page;
433
434 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
435 return VM_FAULT_SIGBUS;
436
437 offset = vmf->pgoff << PAGE_SHIFT;
438 if (offset >= roundup(plm->len, PAGE_SIZE))
439 return VM_FAULT_SIGBUS;
440
441 page = vmalloc_to_page(plm->data + offset);
442 get_page(page);
443
444 vmf->page = page;
445
446 return 0;
447 }
448
449 static const struct vm_operations_struct sel_mmap_policy_ops = {
450 .fault = sel_mmap_policy_fault,
451 .page_mkwrite = sel_mmap_policy_fault,
452 };
453
454 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
455 {
456 if (vma->vm_flags & VM_SHARED) {
457 /* do not allow mprotect to make mapping writable */
458 vma->vm_flags &= ~VM_MAYWRITE;
459
460 if (vma->vm_flags & VM_WRITE)
461 return -EACCES;
462 }
463
464 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
465 vma->vm_ops = &sel_mmap_policy_ops;
466
467 return 0;
468 }
469
470 static const struct file_operations sel_policy_ops = {
471 .open = sel_open_policy,
472 .read = sel_read_policy,
473 .mmap = sel_mmap_policy,
474 .release = sel_release_policy,
475 .llseek = generic_file_llseek,
476 };
477
478 static ssize_t sel_write_load(struct file *file, const char __user *buf,
479 size_t count, loff_t *ppos)
480
481 {
482 ssize_t length;
483 void *data = NULL;
484
485 mutex_lock(&sel_mutex);
486
487 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
488 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
489 if (length)
490 goto out;
491
492 /* No partial writes. */
493 length = -EINVAL;
494 if (*ppos != 0)
495 goto out;
496
497 length = -EFBIG;
498 if (count > 64 * 1024 * 1024)
499 goto out;
500
501 length = -ENOMEM;
502 data = vmalloc(count);
503 if (!data)
504 goto out;
505
506 length = -EFAULT;
507 if (copy_from_user(data, buf, count) != 0)
508 goto out;
509
510 length = security_load_policy(data, count);
511 if (length) {
512 pr_warn_ratelimited("SELinux: failed to load policy\n");
513 goto out;
514 }
515
516 length = sel_make_bools();
517 if (length) {
518 pr_err("SELinux: failed to load policy booleans\n");
519 goto out1;
520 }
521
522 length = sel_make_classes();
523 if (length) {
524 pr_err("SELinux: failed to load policy classes\n");
525 goto out1;
526 }
527
528 length = sel_make_policycap();
529 if (length) {
530 pr_err("SELinux: failed to load policy capabilities\n");
531 goto out1;
532 }
533
534 length = count;
535
536 out1:
537 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
538 "policy loaded auid=%u ses=%u",
539 from_kuid(&init_user_ns, audit_get_loginuid(current)),
540 audit_get_sessionid(current));
541 out:
542 mutex_unlock(&sel_mutex);
543 vfree(data);
544 return length;
545 }
546
547 static const struct file_operations sel_load_ops = {
548 .write = sel_write_load,
549 .llseek = generic_file_llseek,
550 };
551
552 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
553 {
554 char *canon = NULL;
555 u32 sid, len;
556 ssize_t length;
557
558 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
559 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
560 if (length)
561 goto out;
562
563 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
564 if (length)
565 goto out;
566
567 length = security_sid_to_context(sid, &canon, &len);
568 if (length)
569 goto out;
570
571 length = -ERANGE;
572 if (len > SIMPLE_TRANSACTION_LIMIT) {
573 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
574 "payload max\n", __func__, len);
575 goto out;
576 }
577
578 memcpy(buf, canon, len);
579 length = len;
580 out:
581 kfree(canon);
582 return length;
583 }
584
585 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
586 size_t count, loff_t *ppos)
587 {
588 char tmpbuf[TMPBUFLEN];
589 ssize_t length;
590
591 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
592 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
593 }
594
595 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
597 {
598 char *page;
599 ssize_t length;
600 unsigned int new_value;
601
602 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
603 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
604 NULL);
605 if (length)
606 return length;
607
608 if (count >= PAGE_SIZE)
609 return -ENOMEM;
610
611 /* No partial writes. */
612 if (*ppos != 0)
613 return -EINVAL;
614
615 page = memdup_user_nul(buf, count);
616 if (IS_ERR(page))
617 return PTR_ERR(page);
618
619 length = -EINVAL;
620 if (sscanf(page, "%u", &new_value) != 1)
621 goto out;
622
623 selinux_checkreqprot = new_value ? 1 : 0;
624 length = count;
625 out:
626 kfree(page);
627 return length;
628 }
629 static const struct file_operations sel_checkreqprot_ops = {
630 .read = sel_read_checkreqprot,
631 .write = sel_write_checkreqprot,
632 .llseek = generic_file_llseek,
633 };
634
635 static ssize_t sel_write_validatetrans(struct file *file,
636 const char __user *buf,
637 size_t count, loff_t *ppos)
638 {
639 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
640 char *req = NULL;
641 u32 osid, nsid, tsid;
642 u16 tclass;
643 int rc;
644
645 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
646 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
647 if (rc)
648 goto out;
649
650 rc = -ENOMEM;
651 if (count >= PAGE_SIZE)
652 goto out;
653
654 /* No partial writes. */
655 rc = -EINVAL;
656 if (*ppos != 0)
657 goto out;
658
659 rc = -ENOMEM;
660 req = kzalloc(count + 1, GFP_KERNEL);
661 if (!req)
662 goto out;
663
664 rc = -EFAULT;
665 if (copy_from_user(req, buf, count))
666 goto out;
667
668 rc = -ENOMEM;
669 oldcon = kzalloc(count + 1, GFP_KERNEL);
670 if (!oldcon)
671 goto out;
672
673 newcon = kzalloc(count + 1, GFP_KERNEL);
674 if (!newcon)
675 goto out;
676
677 taskcon = kzalloc(count + 1, GFP_KERNEL);
678 if (!taskcon)
679 goto out;
680
681 rc = -EINVAL;
682 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
683 goto out;
684
685 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
686 if (rc)
687 goto out;
688
689 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
690 if (rc)
691 goto out;
692
693 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
694 if (rc)
695 goto out;
696
697 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
698 if (!rc)
699 rc = count;
700 out:
701 kfree(req);
702 kfree(oldcon);
703 kfree(newcon);
704 kfree(taskcon);
705 return rc;
706 }
707
708 static const struct file_operations sel_transition_ops = {
709 .write = sel_write_validatetrans,
710 .llseek = generic_file_llseek,
711 };
712
713 /*
714 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
715 */
716 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
717 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
718 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
719 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
720 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
721
722 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
723 [SEL_ACCESS] = sel_write_access,
724 [SEL_CREATE] = sel_write_create,
725 [SEL_RELABEL] = sel_write_relabel,
726 [SEL_USER] = sel_write_user,
727 [SEL_MEMBER] = sel_write_member,
728 [SEL_CONTEXT] = sel_write_context,
729 };
730
731 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
732 {
733 ino_t ino = file_inode(file)->i_ino;
734 char *data;
735 ssize_t rv;
736
737 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
738 return -EINVAL;
739
740 data = simple_transaction_get(file, buf, size);
741 if (IS_ERR(data))
742 return PTR_ERR(data);
743
744 rv = write_op[ino](file, data, size);
745 if (rv > 0) {
746 simple_transaction_set(file, rv);
747 rv = size;
748 }
749 return rv;
750 }
751
752 static const struct file_operations transaction_ops = {
753 .write = selinux_transaction_write,
754 .read = simple_transaction_read,
755 .release = simple_transaction_release,
756 .llseek = generic_file_llseek,
757 };
758
759 /*
760 * payload - write methods
761 * If the method has a response, the response should be put in buf,
762 * and the length returned. Otherwise return 0 or and -error.
763 */
764
765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
766 {
767 char *scon = NULL, *tcon = NULL;
768 u32 ssid, tsid;
769 u16 tclass;
770 struct av_decision avd;
771 ssize_t length;
772
773 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
774 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
775 if (length)
776 goto out;
777
778 length = -ENOMEM;
779 scon = kzalloc(size + 1, GFP_KERNEL);
780 if (!scon)
781 goto out;
782
783 length = -ENOMEM;
784 tcon = kzalloc(size + 1, GFP_KERNEL);
785 if (!tcon)
786 goto out;
787
788 length = -EINVAL;
789 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
790 goto out;
791
792 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
793 if (length)
794 goto out;
795
796 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
797 if (length)
798 goto out;
799
800 security_compute_av_user(ssid, tsid, tclass, &avd);
801
802 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
803 "%x %x %x %x %u %x",
804 avd.allowed, 0xffffffff,
805 avd.auditallow, avd.auditdeny,
806 avd.seqno, avd.flags);
807 out:
808 kfree(tcon);
809 kfree(scon);
810 return length;
811 }
812
813 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
814 {
815 char *scon = NULL, *tcon = NULL;
816 char *namebuf = NULL, *objname = NULL;
817 u32 ssid, tsid, newsid;
818 u16 tclass;
819 ssize_t length;
820 char *newcon = NULL;
821 u32 len;
822 int nargs;
823
824 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
825 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
826 NULL);
827 if (length)
828 goto out;
829
830 length = -ENOMEM;
831 scon = kzalloc(size + 1, GFP_KERNEL);
832 if (!scon)
833 goto out;
834
835 length = -ENOMEM;
836 tcon = kzalloc(size + 1, GFP_KERNEL);
837 if (!tcon)
838 goto out;
839
840 length = -ENOMEM;
841 namebuf = kzalloc(size + 1, GFP_KERNEL);
842 if (!namebuf)
843 goto out;
844
845 length = -EINVAL;
846 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
847 if (nargs < 3 || nargs > 4)
848 goto out;
849 if (nargs == 4) {
850 /*
851 * If and when the name of new object to be queried contains
852 * either whitespace or multibyte characters, they shall be
853 * encoded based on the percentage-encoding rule.
854 * If not encoded, the sscanf logic picks up only left-half
855 * of the supplied name; splitted by a whitespace unexpectedly.
856 */
857 char *r, *w;
858 int c1, c2;
859
860 r = w = namebuf;
861 do {
862 c1 = *r++;
863 if (c1 == '+')
864 c1 = ' ';
865 else if (c1 == '%') {
866 c1 = hex_to_bin(*r++);
867 if (c1 < 0)
868 goto out;
869 c2 = hex_to_bin(*r++);
870 if (c2 < 0)
871 goto out;
872 c1 = (c1 << 4) | c2;
873 }
874 *w++ = c1;
875 } while (c1 != '\0');
876
877 objname = namebuf;
878 }
879
880 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
881 if (length)
882 goto out;
883
884 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
885 if (length)
886 goto out;
887
888 length = security_transition_sid_user(ssid, tsid, tclass,
889 objname, &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 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
900 "payload max\n", __func__, len);
901 goto out;
902 }
903
904 memcpy(buf, newcon, len);
905 length = len;
906 out:
907 kfree(newcon);
908 kfree(namebuf);
909 kfree(tcon);
910 kfree(scon);
911 return length;
912 }
913
914 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
915 {
916 char *scon = NULL, *tcon = NULL;
917 u32 ssid, tsid, newsid;
918 u16 tclass;
919 ssize_t length;
920 char *newcon = NULL;
921 u32 len;
922
923 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
924 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
925 NULL);
926 if (length)
927 goto out;
928
929 length = -ENOMEM;
930 scon = kzalloc(size + 1, GFP_KERNEL);
931 if (!scon)
932 goto out;
933
934 length = -ENOMEM;
935 tcon = kzalloc(size + 1, GFP_KERNEL);
936 if (!tcon)
937 goto out;
938
939 length = -EINVAL;
940 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
941 goto out;
942
943 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
944 if (length)
945 goto out;
946
947 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
948 if (length)
949 goto out;
950
951 length = security_change_sid(ssid, tsid, tclass, &newsid);
952 if (length)
953 goto out;
954
955 length = security_sid_to_context(newsid, &newcon, &len);
956 if (length)
957 goto out;
958
959 length = -ERANGE;
960 if (len > SIMPLE_TRANSACTION_LIMIT)
961 goto out;
962
963 memcpy(buf, newcon, len);
964 length = len;
965 out:
966 kfree(newcon);
967 kfree(tcon);
968 kfree(scon);
969 return length;
970 }
971
972 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
973 {
974 char *con = NULL, *user = NULL, *ptr;
975 u32 sid, *sids = NULL;
976 ssize_t length;
977 char *newcon;
978 int i, rc;
979 u32 len, nsids;
980
981 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
982 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
983 NULL);
984 if (length)
985 goto out;
986
987 length = -ENOMEM;
988 con = kzalloc(size + 1, GFP_KERNEL);
989 if (!con)
990 goto out;
991
992 length = -ENOMEM;
993 user = kzalloc(size + 1, GFP_KERNEL);
994 if (!user)
995 goto out;
996
997 length = -EINVAL;
998 if (sscanf(buf, "%s %s", con, user) != 2)
999 goto out;
1000
1001 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
1002 if (length)
1003 goto out;
1004
1005 length = security_get_user_sids(sid, user, &sids, &nsids);
1006 if (length)
1007 goto out;
1008
1009 length = sprintf(buf, "%u", nsids) + 1;
1010 ptr = buf + length;
1011 for (i = 0; i < nsids; i++) {
1012 rc = security_sid_to_context(sids[i], &newcon, &len);
1013 if (rc) {
1014 length = rc;
1015 goto out;
1016 }
1017 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1018 kfree(newcon);
1019 length = -ERANGE;
1020 goto out;
1021 }
1022 memcpy(ptr, newcon, len);
1023 kfree(newcon);
1024 ptr += len;
1025 length += len;
1026 }
1027 out:
1028 kfree(sids);
1029 kfree(user);
1030 kfree(con);
1031 return length;
1032 }
1033
1034 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1035 {
1036 char *scon = NULL, *tcon = NULL;
1037 u32 ssid, tsid, newsid;
1038 u16 tclass;
1039 ssize_t length;
1040 char *newcon = NULL;
1041 u32 len;
1042
1043 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1044 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1045 NULL);
1046 if (length)
1047 goto out;
1048
1049 length = -ENOMEM;
1050 scon = kzalloc(size + 1, GFP_KERNEL);
1051 if (!scon)
1052 goto out;
1053
1054 length = -ENOMEM;
1055 tcon = kzalloc(size + 1, GFP_KERNEL);
1056 if (!tcon)
1057 goto out;
1058
1059 length = -EINVAL;
1060 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1061 goto out;
1062
1063 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1064 if (length)
1065 goto out;
1066
1067 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1068 if (length)
1069 goto out;
1070
1071 length = security_member_sid(ssid, tsid, tclass, &newsid);
1072 if (length)
1073 goto out;
1074
1075 length = security_sid_to_context(newsid, &newcon, &len);
1076 if (length)
1077 goto out;
1078
1079 length = -ERANGE;
1080 if (len > SIMPLE_TRANSACTION_LIMIT) {
1081 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1082 "payload max\n", __func__, len);
1083 goto out;
1084 }
1085
1086 memcpy(buf, newcon, len);
1087 length = len;
1088 out:
1089 kfree(newcon);
1090 kfree(tcon);
1091 kfree(scon);
1092 return length;
1093 }
1094
1095 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1096 {
1097 struct inode *ret = new_inode(sb);
1098
1099 if (ret) {
1100 ret->i_mode = mode;
1101 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1102 }
1103 return ret;
1104 }
1105
1106 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1107 size_t count, loff_t *ppos)
1108 {
1109 char *page = NULL;
1110 ssize_t length;
1111 ssize_t ret;
1112 int cur_enforcing;
1113 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1114 const char *name = filep->f_path.dentry->d_name.name;
1115
1116 mutex_lock(&sel_mutex);
1117
1118 ret = -EINVAL;
1119 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1120 goto out;
1121
1122 ret = -ENOMEM;
1123 page = (char *)get_zeroed_page(GFP_KERNEL);
1124 if (!page)
1125 goto out;
1126
1127 cur_enforcing = security_get_bool_value(index);
1128 if (cur_enforcing < 0) {
1129 ret = cur_enforcing;
1130 goto out;
1131 }
1132 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1133 bool_pending_values[index]);
1134 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1135 out:
1136 mutex_unlock(&sel_mutex);
1137 free_page((unsigned long)page);
1138 return ret;
1139 }
1140
1141 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1142 size_t count, loff_t *ppos)
1143 {
1144 char *page = NULL;
1145 ssize_t length;
1146 int new_value;
1147 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1148 const char *name = filep->f_path.dentry->d_name.name;
1149
1150 mutex_lock(&sel_mutex);
1151
1152 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1153 SECCLASS_SECURITY, SECURITY__SETBOOL,
1154 NULL);
1155 if (length)
1156 goto out;
1157
1158 length = -EINVAL;
1159 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1160 goto out;
1161
1162 length = -ENOMEM;
1163 if (count >= PAGE_SIZE)
1164 goto out;
1165
1166 /* No partial writes. */
1167 length = -EINVAL;
1168 if (*ppos != 0)
1169 goto out;
1170
1171 page = memdup_user_nul(buf, count);
1172 if (IS_ERR(page)) {
1173 length = PTR_ERR(page);
1174 page = NULL;
1175 goto out;
1176 }
1177
1178 length = -EINVAL;
1179 if (sscanf(page, "%d", &new_value) != 1)
1180 goto out;
1181
1182 if (new_value)
1183 new_value = 1;
1184
1185 bool_pending_values[index] = new_value;
1186 length = count;
1187
1188 out:
1189 mutex_unlock(&sel_mutex);
1190 kfree(page);
1191 return length;
1192 }
1193
1194 static const struct file_operations sel_bool_ops = {
1195 .read = sel_read_bool,
1196 .write = sel_write_bool,
1197 .llseek = generic_file_llseek,
1198 };
1199
1200 static ssize_t sel_commit_bools_write(struct file *filep,
1201 const char __user *buf,
1202 size_t count, loff_t *ppos)
1203 {
1204 char *page = NULL;
1205 ssize_t length;
1206 int new_value;
1207
1208 mutex_lock(&sel_mutex);
1209
1210 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1211 SECCLASS_SECURITY, SECURITY__SETBOOL,
1212 NULL);
1213 if (length)
1214 goto out;
1215
1216 length = -ENOMEM;
1217 if (count >= PAGE_SIZE)
1218 goto out;
1219
1220 /* No partial writes. */
1221 length = -EINVAL;
1222 if (*ppos != 0)
1223 goto out;
1224
1225 page = memdup_user_nul(buf, count);
1226 if (IS_ERR(page)) {
1227 length = PTR_ERR(page);
1228 page = NULL;
1229 goto out;
1230 }
1231
1232 length = -EINVAL;
1233 if (sscanf(page, "%d", &new_value) != 1)
1234 goto out;
1235
1236 length = 0;
1237 if (new_value && bool_pending_values)
1238 length = security_set_bools(bool_num, bool_pending_values);
1239
1240 if (!length)
1241 length = count;
1242
1243 out:
1244 mutex_unlock(&sel_mutex);
1245 kfree(page);
1246 return length;
1247 }
1248
1249 static const struct file_operations sel_commit_bools_ops = {
1250 .write = sel_commit_bools_write,
1251 .llseek = generic_file_llseek,
1252 };
1253
1254 static void sel_remove_entries(struct dentry *de)
1255 {
1256 d_genocide(de);
1257 shrink_dcache_parent(de);
1258 }
1259
1260 #define BOOL_DIR_NAME "booleans"
1261
1262 static int sel_make_bools(void)
1263 {
1264 int i, ret;
1265 ssize_t len;
1266 struct dentry *dentry = NULL;
1267 struct dentry *dir = bool_dir;
1268 struct inode *inode = NULL;
1269 struct inode_security_struct *isec;
1270 char **names = NULL, *page;
1271 int num;
1272 int *values = NULL;
1273 u32 sid;
1274
1275 /* remove any existing files */
1276 for (i = 0; i < bool_num; i++)
1277 kfree(bool_pending_names[i]);
1278 kfree(bool_pending_names);
1279 kfree(bool_pending_values);
1280 bool_num = 0;
1281 bool_pending_names = NULL;
1282 bool_pending_values = NULL;
1283
1284 sel_remove_entries(dir);
1285
1286 ret = -ENOMEM;
1287 page = (char *)get_zeroed_page(GFP_KERNEL);
1288 if (!page)
1289 goto out;
1290
1291 ret = security_get_bools(&num, &names, &values);
1292 if (ret)
1293 goto out;
1294
1295 for (i = 0; i < num; i++) {
1296 ret = -ENOMEM;
1297 dentry = d_alloc_name(dir, names[i]);
1298 if (!dentry)
1299 goto out;
1300
1301 ret = -ENOMEM;
1302 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1303 if (!inode)
1304 goto out;
1305
1306 ret = -ENAMETOOLONG;
1307 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1308 if (len >= PAGE_SIZE)
1309 goto out;
1310
1311 isec = (struct inode_security_struct *)inode->i_security;
1312 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1313 if (ret) {
1314 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1315 page);
1316 sid = SECINITSID_SECURITY;
1317 }
1318
1319 isec->sid = sid;
1320 isec->initialized = LABEL_INITIALIZED;
1321 inode->i_fop = &sel_bool_ops;
1322 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1323 d_add(dentry, inode);
1324 }
1325 bool_num = num;
1326 bool_pending_names = names;
1327 bool_pending_values = values;
1328
1329 free_page((unsigned long)page);
1330 return 0;
1331 out:
1332 free_page((unsigned long)page);
1333
1334 if (names) {
1335 for (i = 0; i < num; i++)
1336 kfree(names[i]);
1337 kfree(names);
1338 }
1339 kfree(values);
1340 sel_remove_entries(dir);
1341
1342 return ret;
1343 }
1344
1345 #define NULL_FILE_NAME "null"
1346
1347 struct path selinux_null;
1348
1349 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1350 size_t count, loff_t *ppos)
1351 {
1352 char tmpbuf[TMPBUFLEN];
1353 ssize_t length;
1354
1355 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1356 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1357 }
1358
1359 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1360 const char __user *buf,
1361 size_t count, loff_t *ppos)
1362
1363 {
1364 char *page;
1365 ssize_t ret;
1366 unsigned int new_value;
1367
1368 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1369 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1370 NULL);
1371 if (ret)
1372 return ret;
1373
1374 if (count >= PAGE_SIZE)
1375 return -ENOMEM;
1376
1377 /* No partial writes. */
1378 if (*ppos != 0)
1379 return -EINVAL;
1380
1381 page = memdup_user_nul(buf, count);
1382 if (IS_ERR(page))
1383 return PTR_ERR(page);
1384
1385 ret = -EINVAL;
1386 if (sscanf(page, "%u", &new_value) != 1)
1387 goto out;
1388
1389 avc_cache_threshold = new_value;
1390
1391 ret = count;
1392 out:
1393 kfree(page);
1394 return ret;
1395 }
1396
1397 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1398 size_t count, loff_t *ppos)
1399 {
1400 char *page;
1401 ssize_t length;
1402
1403 page = (char *)__get_free_page(GFP_KERNEL);
1404 if (!page)
1405 return -ENOMEM;
1406
1407 length = avc_get_hash_stats(page);
1408 if (length >= 0)
1409 length = simple_read_from_buffer(buf, count, ppos, page, length);
1410 free_page((unsigned long)page);
1411
1412 return length;
1413 }
1414
1415 static const struct file_operations sel_avc_cache_threshold_ops = {
1416 .read = sel_read_avc_cache_threshold,
1417 .write = sel_write_avc_cache_threshold,
1418 .llseek = generic_file_llseek,
1419 };
1420
1421 static const struct file_operations sel_avc_hash_stats_ops = {
1422 .read = sel_read_avc_hash_stats,
1423 .llseek = generic_file_llseek,
1424 };
1425
1426 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1427 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1428 {
1429 int cpu;
1430
1431 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1432 if (!cpu_possible(cpu))
1433 continue;
1434 *idx = cpu + 1;
1435 return &per_cpu(avc_cache_stats, cpu);
1436 }
1437 return NULL;
1438 }
1439
1440 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1441 {
1442 loff_t n = *pos - 1;
1443
1444 if (*pos == 0)
1445 return SEQ_START_TOKEN;
1446
1447 return sel_avc_get_stat_idx(&n);
1448 }
1449
1450 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1451 {
1452 return sel_avc_get_stat_idx(pos);
1453 }
1454
1455 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1456 {
1457 struct avc_cache_stats *st = v;
1458
1459 if (v == SEQ_START_TOKEN)
1460 seq_printf(seq, "lookups hits misses allocations reclaims "
1461 "frees\n");
1462 else {
1463 unsigned int lookups = st->lookups;
1464 unsigned int misses = st->misses;
1465 unsigned int hits = lookups - misses;
1466 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1467 hits, misses, st->allocations,
1468 st->reclaims, st->frees);
1469 }
1470 return 0;
1471 }
1472
1473 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1474 { }
1475
1476 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1477 .start = sel_avc_stats_seq_start,
1478 .next = sel_avc_stats_seq_next,
1479 .show = sel_avc_stats_seq_show,
1480 .stop = sel_avc_stats_seq_stop,
1481 };
1482
1483 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1484 {
1485 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1486 }
1487
1488 static const struct file_operations sel_avc_cache_stats_ops = {
1489 .open = sel_open_avc_cache_stats,
1490 .read = seq_read,
1491 .llseek = seq_lseek,
1492 .release = seq_release,
1493 };
1494 #endif
1495
1496 static int sel_make_avc_files(struct dentry *dir)
1497 {
1498 int i;
1499 static struct tree_descr files[] = {
1500 { "cache_threshold",
1501 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1502 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1503 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1504 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1505 #endif
1506 };
1507
1508 for (i = 0; i < ARRAY_SIZE(files); i++) {
1509 struct inode *inode;
1510 struct dentry *dentry;
1511
1512 dentry = d_alloc_name(dir, files[i].name);
1513 if (!dentry)
1514 return -ENOMEM;
1515
1516 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1517 if (!inode)
1518 return -ENOMEM;
1519
1520 inode->i_fop = files[i].ops;
1521 inode->i_ino = ++sel_last_ino;
1522 d_add(dentry, inode);
1523 }
1524
1525 return 0;
1526 }
1527
1528 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1529 size_t count, loff_t *ppos)
1530 {
1531 char *con;
1532 u32 sid, len;
1533 ssize_t ret;
1534
1535 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1536 ret = security_sid_to_context(sid, &con, &len);
1537 if (ret)
1538 return ret;
1539
1540 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1541 kfree(con);
1542 return ret;
1543 }
1544
1545 static const struct file_operations sel_initcon_ops = {
1546 .read = sel_read_initcon,
1547 .llseek = generic_file_llseek,
1548 };
1549
1550 static int sel_make_initcon_files(struct dentry *dir)
1551 {
1552 int i;
1553
1554 for (i = 1; i <= SECINITSID_NUM; i++) {
1555 struct inode *inode;
1556 struct dentry *dentry;
1557 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1558 if (!dentry)
1559 return -ENOMEM;
1560
1561 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1562 if (!inode)
1563 return -ENOMEM;
1564
1565 inode->i_fop = &sel_initcon_ops;
1566 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1567 d_add(dentry, inode);
1568 }
1569
1570 return 0;
1571 }
1572
1573 static inline unsigned long sel_class_to_ino(u16 class)
1574 {
1575 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1576 }
1577
1578 static inline u16 sel_ino_to_class(unsigned long ino)
1579 {
1580 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1581 }
1582
1583 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1584 {
1585 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1586 }
1587
1588 static inline u32 sel_ino_to_perm(unsigned long ino)
1589 {
1590 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1591 }
1592
1593 static ssize_t sel_read_class(struct file *file, char __user *buf,
1594 size_t count, loff_t *ppos)
1595 {
1596 unsigned long ino = file_inode(file)->i_ino;
1597 char res[TMPBUFLEN];
1598 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1599 return simple_read_from_buffer(buf, count, ppos, res, len);
1600 }
1601
1602 static const struct file_operations sel_class_ops = {
1603 .read = sel_read_class,
1604 .llseek = generic_file_llseek,
1605 };
1606
1607 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1608 size_t count, loff_t *ppos)
1609 {
1610 unsigned long ino = file_inode(file)->i_ino;
1611 char res[TMPBUFLEN];
1612 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1613 return simple_read_from_buffer(buf, count, ppos, res, len);
1614 }
1615
1616 static const struct file_operations sel_perm_ops = {
1617 .read = sel_read_perm,
1618 .llseek = generic_file_llseek,
1619 };
1620
1621 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1622 size_t count, loff_t *ppos)
1623 {
1624 int value;
1625 char tmpbuf[TMPBUFLEN];
1626 ssize_t length;
1627 unsigned long i_ino = file_inode(file)->i_ino;
1628
1629 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1630 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1631
1632 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1633 }
1634
1635 static const struct file_operations sel_policycap_ops = {
1636 .read = sel_read_policycap,
1637 .llseek = generic_file_llseek,
1638 };
1639
1640 static int sel_make_perm_files(char *objclass, int classvalue,
1641 struct dentry *dir)
1642 {
1643 int i, rc, nperms;
1644 char **perms;
1645
1646 rc = security_get_permissions(objclass, &perms, &nperms);
1647 if (rc)
1648 return rc;
1649
1650 for (i = 0; i < nperms; i++) {
1651 struct inode *inode;
1652 struct dentry *dentry;
1653
1654 rc = -ENOMEM;
1655 dentry = d_alloc_name(dir, perms[i]);
1656 if (!dentry)
1657 goto out;
1658
1659 rc = -ENOMEM;
1660 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1661 if (!inode)
1662 goto out;
1663
1664 inode->i_fop = &sel_perm_ops;
1665 /* i+1 since perm values are 1-indexed */
1666 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1667 d_add(dentry, inode);
1668 }
1669 rc = 0;
1670 out:
1671 for (i = 0; i < nperms; i++)
1672 kfree(perms[i]);
1673 kfree(perms);
1674 return rc;
1675 }
1676
1677 static int sel_make_class_dir_entries(char *classname, int index,
1678 struct dentry *dir)
1679 {
1680 struct dentry *dentry = NULL;
1681 struct inode *inode = NULL;
1682 int rc;
1683
1684 dentry = d_alloc_name(dir, "index");
1685 if (!dentry)
1686 return -ENOMEM;
1687
1688 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1689 if (!inode)
1690 return -ENOMEM;
1691
1692 inode->i_fop = &sel_class_ops;
1693 inode->i_ino = sel_class_to_ino(index);
1694 d_add(dentry, inode);
1695
1696 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1697 if (IS_ERR(dentry))
1698 return PTR_ERR(dentry);
1699
1700 rc = sel_make_perm_files(classname, index, dentry);
1701
1702 return rc;
1703 }
1704
1705 static int sel_make_classes(void)
1706 {
1707 int rc, nclasses, i;
1708 char **classes;
1709
1710 /* delete any existing entries */
1711 sel_remove_entries(class_dir);
1712
1713 rc = security_get_classes(&classes, &nclasses);
1714 if (rc)
1715 return rc;
1716
1717 /* +2 since classes are 1-indexed */
1718 last_class_ino = sel_class_to_ino(nclasses + 2);
1719
1720 for (i = 0; i < nclasses; i++) {
1721 struct dentry *class_name_dir;
1722
1723 class_name_dir = sel_make_dir(class_dir, classes[i],
1724 &last_class_ino);
1725 if (IS_ERR(class_name_dir)) {
1726 rc = PTR_ERR(class_name_dir);
1727 goto out;
1728 }
1729
1730 /* i+1 since class values are 1-indexed */
1731 rc = sel_make_class_dir_entries(classes[i], i + 1,
1732 class_name_dir);
1733 if (rc)
1734 goto out;
1735 }
1736 rc = 0;
1737 out:
1738 for (i = 0; i < nclasses; i++)
1739 kfree(classes[i]);
1740 kfree(classes);
1741 return rc;
1742 }
1743
1744 static int sel_make_policycap(void)
1745 {
1746 unsigned int iter;
1747 struct dentry *dentry = NULL;
1748 struct inode *inode = NULL;
1749
1750 sel_remove_entries(policycap_dir);
1751
1752 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1753 if (iter < ARRAY_SIZE(policycap_names))
1754 dentry = d_alloc_name(policycap_dir,
1755 policycap_names[iter]);
1756 else
1757 dentry = d_alloc_name(policycap_dir, "unknown");
1758
1759 if (dentry == NULL)
1760 return -ENOMEM;
1761
1762 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1763 if (inode == NULL)
1764 return -ENOMEM;
1765
1766 inode->i_fop = &sel_policycap_ops;
1767 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1768 d_add(dentry, inode);
1769 }
1770
1771 return 0;
1772 }
1773
1774 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1775 unsigned long *ino)
1776 {
1777 struct dentry *dentry = d_alloc_name(dir, name);
1778 struct inode *inode;
1779
1780 if (!dentry)
1781 return ERR_PTR(-ENOMEM);
1782
1783 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1784 if (!inode) {
1785 dput(dentry);
1786 return ERR_PTR(-ENOMEM);
1787 }
1788
1789 inode->i_op = &simple_dir_inode_operations;
1790 inode->i_fop = &simple_dir_operations;
1791 inode->i_ino = ++(*ino);
1792 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1793 inc_nlink(inode);
1794 d_add(dentry, inode);
1795 /* bump link count on parent directory, too */
1796 inc_nlink(d_inode(dir));
1797
1798 return dentry;
1799 }
1800
1801 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1802 {
1803 int ret;
1804 struct dentry *dentry;
1805 struct inode *inode;
1806 struct inode_security_struct *isec;
1807
1808 static struct tree_descr selinux_files[] = {
1809 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1810 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1811 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1812 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1813 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1814 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1815 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1816 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1817 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1818 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1819 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1820 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1821 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1822 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1823 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1824 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1825 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1826 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1827 S_IWUGO},
1828 /* last one */ {""}
1829 };
1830 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1831 if (ret)
1832 goto err;
1833
1834 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1835 if (IS_ERR(bool_dir)) {
1836 ret = PTR_ERR(bool_dir);
1837 bool_dir = NULL;
1838 goto err;
1839 }
1840
1841 ret = -ENOMEM;
1842 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1843 if (!dentry)
1844 goto err;
1845
1846 ret = -ENOMEM;
1847 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1848 if (!inode)
1849 goto err;
1850
1851 inode->i_ino = ++sel_last_ino;
1852 isec = (struct inode_security_struct *)inode->i_security;
1853 isec->sid = SECINITSID_DEVNULL;
1854 isec->sclass = SECCLASS_CHR_FILE;
1855 isec->initialized = LABEL_INITIALIZED;
1856
1857 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1858 d_add(dentry, inode);
1859 selinux_null.dentry = dentry;
1860
1861 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1862 if (IS_ERR(dentry)) {
1863 ret = PTR_ERR(dentry);
1864 goto err;
1865 }
1866
1867 ret = sel_make_avc_files(dentry);
1868 if (ret)
1869 goto err;
1870
1871 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1872 if (IS_ERR(dentry)) {
1873 ret = PTR_ERR(dentry);
1874 goto err;
1875 }
1876
1877 ret = sel_make_initcon_files(dentry);
1878 if (ret)
1879 goto err;
1880
1881 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1882 if (IS_ERR(class_dir)) {
1883 ret = PTR_ERR(class_dir);
1884 class_dir = NULL;
1885 goto err;
1886 }
1887
1888 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1889 if (IS_ERR(policycap_dir)) {
1890 ret = PTR_ERR(policycap_dir);
1891 policycap_dir = NULL;
1892 goto err;
1893 }
1894 return 0;
1895 err:
1896 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1897 __func__);
1898 return ret;
1899 }
1900
1901 static struct dentry *sel_mount(struct file_system_type *fs_type,
1902 int flags, const char *dev_name, void *data)
1903 {
1904 return mount_single(fs_type, flags, data, sel_fill_super);
1905 }
1906
1907 static struct file_system_type sel_fs_type = {
1908 .name = "selinuxfs",
1909 .mount = sel_mount,
1910 .kill_sb = kill_litter_super,
1911 };
1912
1913 struct vfsmount *selinuxfs_mount;
1914
1915 static int __init init_sel_fs(void)
1916 {
1917 int err;
1918
1919 if (!selinux_enabled)
1920 return 0;
1921
1922 err = sysfs_create_mount_point(fs_kobj, "selinux");
1923 if (err)
1924 return err;
1925
1926 err = register_filesystem(&sel_fs_type);
1927 if (err) {
1928 sysfs_remove_mount_point(fs_kobj, "selinux");
1929 return err;
1930 }
1931
1932 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1933 if (IS_ERR(selinuxfs_mount)) {
1934 printk(KERN_ERR "selinuxfs: could not mount!\n");
1935 err = PTR_ERR(selinuxfs_mount);
1936 selinuxfs_mount = NULL;
1937 }
1938
1939 return err;
1940 }
1941
1942 __initcall(init_sel_fs);
1943
1944 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1945 void exit_sel_fs(void)
1946 {
1947 sysfs_remove_mount_point(fs_kobj, "selinux");
1948 kern_unmount(selinuxfs_mount);
1949 unregister_filesystem(&sel_fs_type);
1950 }
1951 #endif
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