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Merge with master of Avi's kvm.git
[linux-2.6/kvm-ia64.git] / security / selinux / selinuxfs.c
blob77d44138864fd5862a180c5907a81c2a52f1b6ab
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul.moore@hp.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
33 /* selinuxfs pseudo filesystem for exporting the security policy API.
34 Based on the proc code and the fs/nfsd/nfsctl.c code. */
35
36 #include "flask.h"
37 #include "avc.h"
38 #include "avc_ss.h"
39 #include "security.h"
40 #include "objsec.h"
41 #include "conditional.h"
42
43 /* Policy capability filenames */
44 static char *policycap_names[] = {
45 "network_peer_controls",
46 "open_perms"
47 };
48
49 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
50
51 static int __init checkreqprot_setup(char *str)
52 {
53 unsigned long checkreqprot;
54 if (!strict_strtoul(str, 0, &checkreqprot))
55 selinux_checkreqprot = checkreqprot ? 1 : 0;
56 return 1;
57 }
58 __setup("checkreqprot=", checkreqprot_setup);
59
60 static DEFINE_MUTEX(sel_mutex);
61
62 /* global data for booleans */
63 static struct dentry *bool_dir;
64 static int bool_num;
65 static char **bool_pending_names;
66 static int *bool_pending_values;
67
68 /* global data for classes */
69 static struct dentry *class_dir;
70 static unsigned long last_class_ino;
71
72 static char policy_opened;
73
74 /* global data for policy capabilities */
75 static struct dentry *policycap_dir;
76
77 extern void selnl_notify_setenforce(int val);
78
79 /* Check whether a task is allowed to use a security operation. */
80 static int task_has_security(struct task_struct *tsk,
81 u32 perms)
82 {
83 const struct task_security_struct *tsec;
84 u32 sid = 0;
85
86 rcu_read_lock();
87 tsec = __task_cred(tsk)->security;
88 if (tsec)
89 sid = tsec->sid;
90 rcu_read_unlock();
91 if (!tsec)
92 return -EACCES;
93
94 return avc_has_perm(sid, SECINITSID_SECURITY,
95 SECCLASS_SECURITY, perms, NULL);
96 }
97
98 enum sel_inos {
99 SEL_ROOT_INO = 2,
100 SEL_LOAD, /* load policy */
101 SEL_ENFORCE, /* get or set enforcing status */
102 SEL_CONTEXT, /* validate context */
103 SEL_ACCESS, /* compute access decision */
104 SEL_CREATE, /* compute create labeling decision */
105 SEL_RELABEL, /* compute relabeling decision */
106 SEL_USER, /* compute reachable user contexts */
107 SEL_POLICYVERS, /* return policy version for this kernel */
108 SEL_COMMIT_BOOLS, /* commit new boolean values */
109 SEL_MLS, /* return if MLS policy is enabled */
110 SEL_DISABLE, /* disable SELinux until next reboot */
111 SEL_MEMBER, /* compute polyinstantiation membership decision */
112 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
113 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
114 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
115 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
116 SEL_STATUS, /* export current status using mmap() */
117 SEL_POLICY, /* allow userspace to read the in kernel policy */
118 SEL_INO_NEXT, /* The next inode number to use */
119 };
120
121 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
122
123 #define SEL_INITCON_INO_OFFSET 0x01000000
124 #define SEL_BOOL_INO_OFFSET 0x02000000
125 #define SEL_CLASS_INO_OFFSET 0x04000000
126 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
127 #define SEL_INO_MASK 0x00ffffff
128
129 #define TMPBUFLEN 12
130 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
131 size_t count, loff_t *ppos)
132 {
133 char tmpbuf[TMPBUFLEN];
134 ssize_t length;
135
136 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
137 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
138 }
139
140 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
141 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
142 size_t count, loff_t *ppos)
143
144 {
145 char *page = NULL;
146 ssize_t length;
147 int new_value;
148
149 length = -ENOMEM;
150 if (count >= PAGE_SIZE)
151 goto out;
152
153 /* No partial writes. */
154 length = EINVAL;
155 if (*ppos != 0)
156 goto out;
157
158 length = -ENOMEM;
159 page = (char *)get_zeroed_page(GFP_KERNEL);
160 if (!page)
161 goto out;
162
163 length = -EFAULT;
164 if (copy_from_user(page, buf, count))
165 goto out;
166
167 length = -EINVAL;
168 if (sscanf(page, "%d", &new_value) != 1)
169 goto out;
170
171 if (new_value != selinux_enforcing) {
172 length = task_has_security(current, SECURITY__SETENFORCE);
173 if (length)
174 goto out;
175 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
176 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
177 new_value, selinux_enforcing,
178 audit_get_loginuid(current),
179 audit_get_sessionid(current));
180 selinux_enforcing = new_value;
181 if (selinux_enforcing)
182 avc_ss_reset(0);
183 selnl_notify_setenforce(selinux_enforcing);
184 selinux_status_update_setenforce(selinux_enforcing);
185 }
186 length = count;
187 out:
188 free_page((unsigned long) page);
189 return length;
190 }
191 #else
192 #define sel_write_enforce NULL
193 #endif
194
195 static const struct file_operations sel_enforce_ops = {
196 .read = sel_read_enforce,
197 .write = sel_write_enforce,
198 .llseek = generic_file_llseek,
199 };
200
201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
202 size_t count, loff_t *ppos)
203 {
204 char tmpbuf[TMPBUFLEN];
205 ssize_t length;
206 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
207 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
208 security_get_reject_unknown() : !security_get_allow_unknown();
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212 }
213
214 static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
217 };
218
219 static int sel_open_handle_status(struct inode *inode, struct file *filp)
220 {
221 struct page *status = selinux_kernel_status_page();
222
223 if (!status)
224 return -ENOMEM;
225
226 filp->private_data = status;
227
228 return 0;
229 }
230
231 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
232 size_t count, loff_t *ppos)
233 {
234 struct page *status = filp->private_data;
235
236 BUG_ON(!status);
237
238 return simple_read_from_buffer(buf, count, ppos,
239 page_address(status),
240 sizeof(struct selinux_kernel_status));
241 }
242
243 static int sel_mmap_handle_status(struct file *filp,
244 struct vm_area_struct *vma)
245 {
246 struct page *status = filp->private_data;
247 unsigned long size = vma->vm_end - vma->vm_start;
248
249 BUG_ON(!status);
250
251 /* only allows one page from the head */
252 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
253 return -EIO;
254 /* disallow writable mapping */
255 if (vma->vm_flags & VM_WRITE)
256 return -EPERM;
257 /* disallow mprotect() turns it into writable */
258 vma->vm_flags &= ~VM_MAYWRITE;
259
260 return remap_pfn_range(vma, vma->vm_start,
261 page_to_pfn(status),
262 size, vma->vm_page_prot);
263 }
264
265 static const struct file_operations sel_handle_status_ops = {
266 .open = sel_open_handle_status,
267 .read = sel_read_handle_status,
268 .mmap = sel_mmap_handle_status,
269 .llseek = generic_file_llseek,
270 };
271
272 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
273 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
274 size_t count, loff_t *ppos)
275
276 {
277 char *page = NULL;
278 ssize_t length;
279 int new_value;
280 extern int selinux_disable(void);
281
282 length = -ENOMEM;
283 if (count >= PAGE_SIZE)
284 goto out;
285
286 /* No partial writes. */
287 length = -EINVAL;
288 if (*ppos != 0)
289 goto out;
290
291 length = -ENOMEM;
292 page = (char *)get_zeroed_page(GFP_KERNEL);
293 if (!page)
294 goto out;
295
296 length = -EFAULT;
297 if (copy_from_user(page, buf, count))
298 goto out;
299
300 length = -EINVAL;
301 if (sscanf(page, "%d", &new_value) != 1)
302 goto out;
303
304 if (new_value) {
305 length = selinux_disable();
306 if (length)
307 goto out;
308 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
309 "selinux=0 auid=%u ses=%u",
310 audit_get_loginuid(current),
311 audit_get_sessionid(current));
312 }
313
314 length = count;
315 out:
316 free_page((unsigned long) page);
317 return length;
318 }
319 #else
320 #define sel_write_disable NULL
321 #endif
322
323 static const struct file_operations sel_disable_ops = {
324 .write = sel_write_disable,
325 .llseek = generic_file_llseek,
326 };
327
328 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
329 size_t count, loff_t *ppos)
330 {
331 char tmpbuf[TMPBUFLEN];
332 ssize_t length;
333
334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
335 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
336 }
337
338 static const struct file_operations sel_policyvers_ops = {
339 .read = sel_read_policyvers,
340 .llseek = generic_file_llseek,
341 };
342
343 /* declaration for sel_write_load */
344 static int sel_make_bools(void);
345 static int sel_make_classes(void);
346 static int sel_make_policycap(void);
347
348 /* declaration for sel_make_class_dirs */
349 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
350 unsigned long *ino);
351
352 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
353 size_t count, loff_t *ppos)
354 {
355 char tmpbuf[TMPBUFLEN];
356 ssize_t length;
357
358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled());
360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
361 }
362
363 static const struct file_operations sel_mls_ops = {
364 .read = sel_read_mls,
365 .llseek = generic_file_llseek,
366 };
367
368 struct policy_load_memory {
369 size_t len;
370 void *data;
371 };
372
373 static int sel_open_policy(struct inode *inode, struct file *filp)
374 {
375 struct policy_load_memory *plm = NULL;
376 int rc;
377
378 BUG_ON(filp->private_data);
379
380 mutex_lock(&sel_mutex);
381
382 rc = task_has_security(current, SECURITY__READ_POLICY);
383 if (rc)
384 goto err;
385
386 rc = -EBUSY;
387 if (policy_opened)
388 goto err;
389
390 rc = -ENOMEM;
391 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
392 if (!plm)
393 goto err;
394
395 if (i_size_read(inode) != security_policydb_len()) {
396 mutex_lock(&inode->i_mutex);
397 i_size_write(inode, security_policydb_len());
398 mutex_unlock(&inode->i_mutex);
399 }
400
401 rc = security_read_policy(&plm->data, &plm->len);
402 if (rc)
403 goto err;
404
405 policy_opened = 1;
406
407 filp->private_data = plm;
408
409 mutex_unlock(&sel_mutex);
410
411 return 0;
412 err:
413 mutex_unlock(&sel_mutex);
414
415 if (plm)
416 vfree(plm->data);
417 kfree(plm);
418 return rc;
419 }
420
421 static int sel_release_policy(struct inode *inode, struct file *filp)
422 {
423 struct policy_load_memory *plm = filp->private_data;
424
425 BUG_ON(!plm);
426
427 policy_opened = 0;
428
429 vfree(plm->data);
430 kfree(plm);
431
432 return 0;
433 }
434
435 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
437 {
438 struct policy_load_memory *plm = filp->private_data;
439 int ret;
440
441 mutex_lock(&sel_mutex);
442
443 ret = task_has_security(current, SECURITY__READ_POLICY);
444 if (ret)
445 goto out;
446
447 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
448 out:
449 mutex_unlock(&sel_mutex);
450 return ret;
451 }
452
453 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
454 struct vm_fault *vmf)
455 {
456 struct policy_load_memory *plm = vma->vm_file->private_data;
457 unsigned long offset;
458 struct page *page;
459
460 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
461 return VM_FAULT_SIGBUS;
462
463 offset = vmf->pgoff << PAGE_SHIFT;
464 if (offset >= roundup(plm->len, PAGE_SIZE))
465 return VM_FAULT_SIGBUS;
466
467 page = vmalloc_to_page(plm->data + offset);
468 get_page(page);
469
470 vmf->page = page;
471
472 return 0;
473 }
474
475 static struct vm_operations_struct sel_mmap_policy_ops = {
476 .fault = sel_mmap_policy_fault,
477 .page_mkwrite = sel_mmap_policy_fault,
478 };
479
480 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
481 {
482 if (vma->vm_flags & VM_SHARED) {
483 /* do not allow mprotect to make mapping writable */
484 vma->vm_flags &= ~VM_MAYWRITE;
485
486 if (vma->vm_flags & VM_WRITE)
487 return -EACCES;
488 }
489
490 vma->vm_flags |= VM_RESERVED;
491 vma->vm_ops = &sel_mmap_policy_ops;
492
493 return 0;
494 }
495
496 static const struct file_operations sel_policy_ops = {
497 .open = sel_open_policy,
498 .read = sel_read_policy,
499 .mmap = sel_mmap_policy,
500 .release = sel_release_policy,
501 };
502
503 static ssize_t sel_write_load(struct file *file, const char __user *buf,
504 size_t count, loff_t *ppos)
505
506 {
507 ssize_t length;
508 void *data = NULL;
509
510 mutex_lock(&sel_mutex);
511
512 length = task_has_security(current, SECURITY__LOAD_POLICY);
513 if (length)
514 goto out;
515
516 /* No partial writes. */
517 length = -EINVAL;
518 if (*ppos != 0)
519 goto out;
520
521 length = -EFBIG;
522 if (count > 64 * 1024 * 1024)
523 goto out;
524
525 length = -ENOMEM;
526 data = vmalloc(count);
527 if (!data)
528 goto out;
529
530 length = -EFAULT;
531 if (copy_from_user(data, buf, count) != 0)
532 goto out;
533
534 length = security_load_policy(data, count);
535 if (length)
536 goto out;
537
538 length = sel_make_bools();
539 if (length)
540 goto out1;
541
542 length = sel_make_classes();
543 if (length)
544 goto out1;
545
546 length = sel_make_policycap();
547 if (length)
548 goto out1;
549
550 length = count;
551
552 out1:
553 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
554 "policy loaded auid=%u ses=%u",
555 audit_get_loginuid(current),
556 audit_get_sessionid(current));
557 out:
558 mutex_unlock(&sel_mutex);
559 vfree(data);
560 return length;
561 }
562
563 static const struct file_operations sel_load_ops = {
564 .write = sel_write_load,
565 .llseek = generic_file_llseek,
566 };
567
568 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
569 {
570 char *canon = NULL;
571 u32 sid, len;
572 ssize_t length;
573
574 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
575 if (length)
576 goto out;
577
578 length = security_context_to_sid(buf, size, &sid);
579 if (length)
580 goto out;
581
582 length = security_sid_to_context(sid, &canon, &len);
583 if (length)
584 goto out;
585
586 length = -ERANGE;
587 if (len > SIMPLE_TRANSACTION_LIMIT) {
588 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
589 "payload max\n", __func__, len);
590 goto out;
591 }
592
593 memcpy(buf, canon, len);
594 length = len;
595 out:
596 kfree(canon);
597 return length;
598 }
599
600 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
601 size_t count, loff_t *ppos)
602 {
603 char tmpbuf[TMPBUFLEN];
604 ssize_t length;
605
606 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
607 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
608 }
609
610 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
611 size_t count, loff_t *ppos)
612 {
613 char *page = NULL;
614 ssize_t length;
615 unsigned int new_value;
616
617 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
618 if (length)
619 goto out;
620
621 length = -ENOMEM;
622 if (count >= PAGE_SIZE)
623 goto out;
624
625 /* No partial writes. */
626 length = -EINVAL;
627 if (*ppos != 0)
628 goto out;
629
630 length = -ENOMEM;
631 page = (char *)get_zeroed_page(GFP_KERNEL);
632 if (!page)
633 goto out;
634
635 length = -EFAULT;
636 if (copy_from_user(page, buf, count))
637 goto out;
638
639 length = -EINVAL;
640 if (sscanf(page, "%u", &new_value) != 1)
641 goto out;
642
643 selinux_checkreqprot = new_value ? 1 : 0;
644 length = count;
645 out:
646 free_page((unsigned long) page);
647 return length;
648 }
649 static const struct file_operations sel_checkreqprot_ops = {
650 .read = sel_read_checkreqprot,
651 .write = sel_write_checkreqprot,
652 .llseek = generic_file_llseek,
653 };
654
655 /*
656 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
657 */
658 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
659 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
662 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
663
664 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
665 [SEL_ACCESS] = sel_write_access,
666 [SEL_CREATE] = sel_write_create,
667 [SEL_RELABEL] = sel_write_relabel,
668 [SEL_USER] = sel_write_user,
669 [SEL_MEMBER] = sel_write_member,
670 [SEL_CONTEXT] = sel_write_context,
671 };
672
673 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
674 {
675 ino_t ino = file->f_path.dentry->d_inode->i_ino;
676 char *data;
677 ssize_t rv;
678
679 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
680 return -EINVAL;
681
682 data = simple_transaction_get(file, buf, size);
683 if (IS_ERR(data))
684 return PTR_ERR(data);
685
686 rv = write_op[ino](file, data, size);
687 if (rv > 0) {
688 simple_transaction_set(file, rv);
689 rv = size;
690 }
691 return rv;
692 }
693
694 static const struct file_operations transaction_ops = {
695 .write = selinux_transaction_write,
696 .read = simple_transaction_read,
697 .release = simple_transaction_release,
698 .llseek = generic_file_llseek,
699 };
700
701 /*
702 * payload - write methods
703 * If the method has a response, the response should be put in buf,
704 * and the length returned. Otherwise return 0 or and -error.
705 */
706
707 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
708 {
709 char *scon = NULL, *tcon = NULL;
710 u32 ssid, tsid;
711 u16 tclass;
712 struct av_decision avd;
713 ssize_t length;
714
715 length = task_has_security(current, SECURITY__COMPUTE_AV);
716 if (length)
717 goto out;
718
719 length = -ENOMEM;
720 scon = kzalloc(size + 1, GFP_KERNEL);
721 if (!scon)
722 goto out;
723
724 length = -ENOMEM;
725 tcon = kzalloc(size + 1, GFP_KERNEL);
726 if (!tcon)
727 goto out;
728
729 length = -EINVAL;
730 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
731 goto out;
732
733 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
734 if (length)
735 goto out;
736
737 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
738 if (length)
739 goto out;
740
741 security_compute_av_user(ssid, tsid, tclass, &avd);
742
743 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
744 "%x %x %x %x %u %x",
745 avd.allowed, 0xffffffff,
746 avd.auditallow, avd.auditdeny,
747 avd.seqno, avd.flags);
748 out:
749 kfree(tcon);
750 kfree(scon);
751 return length;
752 }
753
754 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
755 {
756 char *scon = NULL, *tcon = NULL;
757 char *namebuf = NULL, *objname = NULL;
758 u32 ssid, tsid, newsid;
759 u16 tclass;
760 ssize_t length;
761 char *newcon = NULL;
762 u32 len;
763 int nargs;
764
765 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
766 if (length)
767 goto out;
768
769 length = -ENOMEM;
770 scon = kzalloc(size + 1, GFP_KERNEL);
771 if (!scon)
772 goto out;
773
774 length = -ENOMEM;
775 tcon = kzalloc(size + 1, GFP_KERNEL);
776 if (!tcon)
777 goto out;
778
779 length = -ENOMEM;
780 namebuf = kzalloc(size + 1, GFP_KERNEL);
781 if (!namebuf)
782 goto out;
783
784 length = -EINVAL;
785 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
786 if (nargs < 3 || nargs > 4)
787 goto out;
788 if (nargs == 4)
789 objname = namebuf;
790
791 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
792 if (length)
793 goto out;
794
795 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
796 if (length)
797 goto out;
798
799 length = security_transition_sid_user(ssid, tsid, tclass,
800 objname, &newsid);
801 if (length)
802 goto out;
803
804 length = security_sid_to_context(newsid, &newcon, &len);
805 if (length)
806 goto out;
807
808 length = -ERANGE;
809 if (len > SIMPLE_TRANSACTION_LIMIT) {
810 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
811 "payload max\n", __func__, len);
812 goto out;
813 }
814
815 memcpy(buf, newcon, len);
816 length = len;
817 out:
818 kfree(newcon);
819 kfree(namebuf);
820 kfree(tcon);
821 kfree(scon);
822 return length;
823 }
824
825 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
826 {
827 char *scon = NULL, *tcon = NULL;
828 u32 ssid, tsid, newsid;
829 u16 tclass;
830 ssize_t length;
831 char *newcon = NULL;
832 u32 len;
833
834 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
835 if (length)
836 goto out;
837
838 length = -ENOMEM;
839 scon = kzalloc(size + 1, GFP_KERNEL);
840 if (!scon)
841 goto out;
842
843 length = -ENOMEM;
844 tcon = kzalloc(size + 1, GFP_KERNEL);
845 if (!tcon)
846 goto out;
847
848 length = -EINVAL;
849 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
850 goto out;
851
852 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
853 if (length)
854 goto out;
855
856 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
857 if (length)
858 goto out;
859
860 length = security_change_sid(ssid, tsid, tclass, &newsid);
861 if (length)
862 goto out;
863
864 length = security_sid_to_context(newsid, &newcon, &len);
865 if (length)
866 goto out;
867
868 length = -ERANGE;
869 if (len > SIMPLE_TRANSACTION_LIMIT)
870 goto out;
871
872 memcpy(buf, newcon, len);
873 length = len;
874 out:
875 kfree(newcon);
876 kfree(tcon);
877 kfree(scon);
878 return length;
879 }
880
881 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
882 {
883 char *con = NULL, *user = NULL, *ptr;
884 u32 sid, *sids = NULL;
885 ssize_t length;
886 char *newcon;
887 int i, rc;
888 u32 len, nsids;
889
890 length = task_has_security(current, SECURITY__COMPUTE_USER);
891 if (length)
892 goto out;
893
894 length = -ENOMEM;
895 con = kzalloc(size + 1, GFP_KERNEL);
896 if (!con)
897 goto out;
898
899 length = -ENOMEM;
900 user = kzalloc(size + 1, GFP_KERNEL);
901 if (!user)
902 goto out;
903
904 length = -EINVAL;
905 if (sscanf(buf, "%s %s", con, user) != 2)
906 goto out;
907
908 length = security_context_to_sid(con, strlen(con) + 1, &sid);
909 if (length)
910 goto out;
911
912 length = security_get_user_sids(sid, user, &sids, &nsids);
913 if (length)
914 goto out;
915
916 length = sprintf(buf, "%u", nsids) + 1;
917 ptr = buf + length;
918 for (i = 0; i < nsids; i++) {
919 rc = security_sid_to_context(sids[i], &newcon, &len);
920 if (rc) {
921 length = rc;
922 goto out;
923 }
924 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
925 kfree(newcon);
926 length = -ERANGE;
927 goto out;
928 }
929 memcpy(ptr, newcon, len);
930 kfree(newcon);
931 ptr += len;
932 length += len;
933 }
934 out:
935 kfree(sids);
936 kfree(user);
937 kfree(con);
938 return length;
939 }
940
941 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
942 {
943 char *scon = NULL, *tcon = NULL;
944 u32 ssid, tsid, newsid;
945 u16 tclass;
946 ssize_t length;
947 char *newcon = NULL;
948 u32 len;
949
950 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
951 if (length)
952 goto out;
953
954 length = -ENOMEM;
955 scon = kzalloc(size + 1, GFP_KERNEL);
956 if (!scon)
957 goto out;
958
959 length = -ENOMEM;
960 tcon = kzalloc(size + 1, GFP_KERNEL);
961 if (!tcon)
962 goto out;
963
964 length = -EINVAL;
965 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
966 goto out;
967
968 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
969 if (length)
970 goto out;
971
972 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
973 if (length)
974 goto out;
975
976 length = security_member_sid(ssid, tsid, tclass, &newsid);
977 if (length)
978 goto out;
979
980 length = security_sid_to_context(newsid, &newcon, &len);
981 if (length)
982 goto out;
983
984 length = -ERANGE;
985 if (len > SIMPLE_TRANSACTION_LIMIT) {
986 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
987 "payload max\n", __func__, len);
988 goto out;
989 }
990
991 memcpy(buf, newcon, len);
992 length = len;
993 out:
994 kfree(newcon);
995 kfree(tcon);
996 kfree(scon);
997 return length;
998 }
999
1000 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1001 {
1002 struct inode *ret = new_inode(sb);
1003
1004 if (ret) {
1005 ret->i_mode = mode;
1006 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1007 }
1008 return ret;
1009 }
1010
1011 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1012 size_t count, loff_t *ppos)
1013 {
1014 char *page = NULL;
1015 ssize_t length;
1016 ssize_t ret;
1017 int cur_enforcing;
1018 struct inode *inode = filep->f_path.dentry->d_inode;
1019 unsigned index = inode->i_ino & SEL_INO_MASK;
1020 const char *name = filep->f_path.dentry->d_name.name;
1021
1022 mutex_lock(&sel_mutex);
1023
1024 ret = -EINVAL;
1025 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1026 goto out;
1027
1028 ret = -ENOMEM;
1029 page = (char *)get_zeroed_page(GFP_KERNEL);
1030 if (!page)
1031 goto out;
1032
1033 cur_enforcing = security_get_bool_value(index);
1034 if (cur_enforcing < 0) {
1035 ret = cur_enforcing;
1036 goto out;
1037 }
1038 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1039 bool_pending_values[index]);
1040 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1041 out:
1042 mutex_unlock(&sel_mutex);
1043 free_page((unsigned long)page);
1044 return ret;
1045 }
1046
1047 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1048 size_t count, loff_t *ppos)
1049 {
1050 char *page = NULL;
1051 ssize_t length;
1052 int new_value;
1053 struct inode *inode = filep->f_path.dentry->d_inode;
1054 unsigned index = inode->i_ino & SEL_INO_MASK;
1055 const char *name = filep->f_path.dentry->d_name.name;
1056
1057 mutex_lock(&sel_mutex);
1058
1059 length = task_has_security(current, SECURITY__SETBOOL);
1060 if (length)
1061 goto out;
1062
1063 length = -EINVAL;
1064 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1065 goto out;
1066
1067 length = -ENOMEM;
1068 if (count >= PAGE_SIZE)
1069 goto out;
1070
1071 /* No partial writes. */
1072 length = -EINVAL;
1073 if (*ppos != 0)
1074 goto out;
1075
1076 length = -ENOMEM;
1077 page = (char *)get_zeroed_page(GFP_KERNEL);
1078 if (!page)
1079 goto out;
1080
1081 length = -EFAULT;
1082 if (copy_from_user(page, buf, count))
1083 goto out;
1084
1085 length = -EINVAL;
1086 if (sscanf(page, "%d", &new_value) != 1)
1087 goto out;
1088
1089 if (new_value)
1090 new_value = 1;
1091
1092 bool_pending_values[index] = new_value;
1093 length = count;
1094
1095 out:
1096 mutex_unlock(&sel_mutex);
1097 free_page((unsigned long) page);
1098 return length;
1099 }
1100
1101 static const struct file_operations sel_bool_ops = {
1102 .read = sel_read_bool,
1103 .write = sel_write_bool,
1104 .llseek = generic_file_llseek,
1105 };
1106
1107 static ssize_t sel_commit_bools_write(struct file *filep,
1108 const char __user *buf,
1109 size_t count, loff_t *ppos)
1110 {
1111 char *page = NULL;
1112 ssize_t length;
1113 int new_value;
1114
1115 mutex_lock(&sel_mutex);
1116
1117 length = task_has_security(current, SECURITY__SETBOOL);
1118 if (length)
1119 goto out;
1120
1121 length = -ENOMEM;
1122 if (count >= PAGE_SIZE)
1123 goto out;
1124
1125 /* No partial writes. */
1126 length = -EINVAL;
1127 if (*ppos != 0)
1128 goto out;
1129
1130 length = -ENOMEM;
1131 page = (char *)get_zeroed_page(GFP_KERNEL);
1132 if (!page)
1133 goto out;
1134
1135 length = -EFAULT;
1136 if (copy_from_user(page, buf, count))
1137 goto out;
1138
1139 length = -EINVAL;
1140 if (sscanf(page, "%d", &new_value) != 1)
1141 goto out;
1142
1143 length = 0;
1144 if (new_value && bool_pending_values)
1145 length = security_set_bools(bool_num, bool_pending_values);
1146
1147 if (!length)
1148 length = count;
1149
1150 out:
1151 mutex_unlock(&sel_mutex);
1152 free_page((unsigned long) page);
1153 return length;
1154 }
1155
1156 static const struct file_operations sel_commit_bools_ops = {
1157 .write = sel_commit_bools_write,
1158 .llseek = generic_file_llseek,
1159 };
1160
1161 static void sel_remove_entries(struct dentry *de)
1162 {
1163 struct list_head *node;
1164
1165 spin_lock(&de->d_lock);
1166 node = de->d_subdirs.next;
1167 while (node != &de->d_subdirs) {
1168 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1169
1170 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1171 list_del_init(node);
1172
1173 if (d->d_inode) {
1174 dget_dlock(d);
1175 spin_unlock(&de->d_lock);
1176 spin_unlock(&d->d_lock);
1177 d_delete(d);
1178 simple_unlink(de->d_inode, d);
1179 dput(d);
1180 spin_lock(&de->d_lock);
1181 } else
1182 spin_unlock(&d->d_lock);
1183 node = de->d_subdirs.next;
1184 }
1185
1186 spin_unlock(&de->d_lock);
1187 }
1188
1189 #define BOOL_DIR_NAME "booleans"
1190
1191 static int sel_make_bools(void)
1192 {
1193 int i, ret;
1194 ssize_t len;
1195 struct dentry *dentry = NULL;
1196 struct dentry *dir = bool_dir;
1197 struct inode *inode = NULL;
1198 struct inode_security_struct *isec;
1199 char **names = NULL, *page;
1200 int num;
1201 int *values = NULL;
1202 u32 sid;
1203
1204 /* remove any existing files */
1205 for (i = 0; i < bool_num; i++)
1206 kfree(bool_pending_names[i]);
1207 kfree(bool_pending_names);
1208 kfree(bool_pending_values);
1209 bool_pending_names = NULL;
1210 bool_pending_values = NULL;
1211
1212 sel_remove_entries(dir);
1213
1214 ret = -ENOMEM;
1215 page = (char *)get_zeroed_page(GFP_KERNEL);
1216 if (!page)
1217 goto out;
1218
1219 ret = security_get_bools(&num, &names, &values);
1220 if (ret)
1221 goto out;
1222
1223 for (i = 0; i < num; i++) {
1224 ret = -ENOMEM;
1225 dentry = d_alloc_name(dir, names[i]);
1226 if (!dentry)
1227 goto out;
1228
1229 ret = -ENOMEM;
1230 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1231 if (!inode)
1232 goto out;
1233
1234 ret = -EINVAL;
1235 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1236 if (len < 0)
1237 goto out;
1238
1239 ret = -ENAMETOOLONG;
1240 if (len >= PAGE_SIZE)
1241 goto out;
1242
1243 isec = (struct inode_security_struct *)inode->i_security;
1244 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1245 if (ret)
1246 goto out;
1247
1248 isec->sid = sid;
1249 isec->initialized = 1;
1250 inode->i_fop = &sel_bool_ops;
1251 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1252 d_add(dentry, inode);
1253 }
1254 bool_num = num;
1255 bool_pending_names = names;
1256 bool_pending_values = values;
1257
1258 free_page((unsigned long)page);
1259 return 0;
1260 out:
1261 free_page((unsigned long)page);
1262
1263 if (names) {
1264 for (i = 0; i < num; i++)
1265 kfree(names[i]);
1266 kfree(names);
1267 }
1268 kfree(values);
1269 sel_remove_entries(dir);
1270
1271 return ret;
1272 }
1273
1274 #define NULL_FILE_NAME "null"
1275
1276 struct dentry *selinux_null;
1277
1278 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1279 size_t count, loff_t *ppos)
1280 {
1281 char tmpbuf[TMPBUFLEN];
1282 ssize_t length;
1283
1284 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1285 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1286 }
1287
1288 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1289 const char __user *buf,
1290 size_t count, loff_t *ppos)
1291
1292 {
1293 char *page = NULL;
1294 ssize_t ret;
1295 int new_value;
1296
1297 ret = task_has_security(current, SECURITY__SETSECPARAM);
1298 if (ret)
1299 goto out;
1300
1301 ret = -ENOMEM;
1302 if (count >= PAGE_SIZE)
1303 goto out;
1304
1305 /* No partial writes. */
1306 ret = -EINVAL;
1307 if (*ppos != 0)
1308 goto out;
1309
1310 ret = -ENOMEM;
1311 page = (char *)get_zeroed_page(GFP_KERNEL);
1312 if (!page)
1313 goto out;
1314
1315 ret = -EFAULT;
1316 if (copy_from_user(page, buf, count))
1317 goto out;
1318
1319 ret = -EINVAL;
1320 if (sscanf(page, "%u", &new_value) != 1)
1321 goto out;
1322
1323 avc_cache_threshold = new_value;
1324
1325 ret = count;
1326 out:
1327 free_page((unsigned long)page);
1328 return ret;
1329 }
1330
1331 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1332 size_t count, loff_t *ppos)
1333 {
1334 char *page;
1335 ssize_t length;
1336
1337 page = (char *)__get_free_page(GFP_KERNEL);
1338 if (!page)
1339 return -ENOMEM;
1340
1341 length = avc_get_hash_stats(page);
1342 if (length >= 0)
1343 length = simple_read_from_buffer(buf, count, ppos, page, length);
1344 free_page((unsigned long)page);
1345
1346 return length;
1347 }
1348
1349 static const struct file_operations sel_avc_cache_threshold_ops = {
1350 .read = sel_read_avc_cache_threshold,
1351 .write = sel_write_avc_cache_threshold,
1352 .llseek = generic_file_llseek,
1353 };
1354
1355 static const struct file_operations sel_avc_hash_stats_ops = {
1356 .read = sel_read_avc_hash_stats,
1357 .llseek = generic_file_llseek,
1358 };
1359
1360 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1361 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1362 {
1363 int cpu;
1364
1365 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1366 if (!cpu_possible(cpu))
1367 continue;
1368 *idx = cpu + 1;
1369 return &per_cpu(avc_cache_stats, cpu);
1370 }
1371 return NULL;
1372 }
1373
1374 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1375 {
1376 loff_t n = *pos - 1;
1377
1378 if (*pos == 0)
1379 return SEQ_START_TOKEN;
1380
1381 return sel_avc_get_stat_idx(&n);
1382 }
1383
1384 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1385 {
1386 return sel_avc_get_stat_idx(pos);
1387 }
1388
1389 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1390 {
1391 struct avc_cache_stats *st = v;
1392
1393 if (v == SEQ_START_TOKEN)
1394 seq_printf(seq, "lookups hits misses allocations reclaims "
1395 "frees\n");
1396 else {
1397 unsigned int lookups = st->lookups;
1398 unsigned int misses = st->misses;
1399 unsigned int hits = lookups - misses;
1400 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1401 hits, misses, st->allocations,
1402 st->reclaims, st->frees);
1403 }
1404 return 0;
1405 }
1406
1407 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1408 { }
1409
1410 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1411 .start = sel_avc_stats_seq_start,
1412 .next = sel_avc_stats_seq_next,
1413 .show = sel_avc_stats_seq_show,
1414 .stop = sel_avc_stats_seq_stop,
1415 };
1416
1417 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1418 {
1419 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1420 }
1421
1422 static const struct file_operations sel_avc_cache_stats_ops = {
1423 .open = sel_open_avc_cache_stats,
1424 .read = seq_read,
1425 .llseek = seq_lseek,
1426 .release = seq_release,
1427 };
1428 #endif
1429
1430 static int sel_make_avc_files(struct dentry *dir)
1431 {
1432 int i;
1433 static struct tree_descr files[] = {
1434 { "cache_threshold",
1435 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1436 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1437 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1438 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1439 #endif
1440 };
1441
1442 for (i = 0; i < ARRAY_SIZE(files); i++) {
1443 struct inode *inode;
1444 struct dentry *dentry;
1445
1446 dentry = d_alloc_name(dir, files[i].name);
1447 if (!dentry)
1448 return -ENOMEM;
1449
1450 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1451 if (!inode)
1452 return -ENOMEM;
1453
1454 inode->i_fop = files[i].ops;
1455 inode->i_ino = ++sel_last_ino;
1456 d_add(dentry, inode);
1457 }
1458
1459 return 0;
1460 }
1461
1462 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1463 size_t count, loff_t *ppos)
1464 {
1465 struct inode *inode;
1466 char *con;
1467 u32 sid, len;
1468 ssize_t ret;
1469
1470 inode = file->f_path.dentry->d_inode;
1471 sid = inode->i_ino&SEL_INO_MASK;
1472 ret = security_sid_to_context(sid, &con, &len);
1473 if (ret)
1474 return ret;
1475
1476 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1477 kfree(con);
1478 return ret;
1479 }
1480
1481 static const struct file_operations sel_initcon_ops = {
1482 .read = sel_read_initcon,
1483 .llseek = generic_file_llseek,
1484 };
1485
1486 static int sel_make_initcon_files(struct dentry *dir)
1487 {
1488 int i;
1489
1490 for (i = 1; i <= SECINITSID_NUM; i++) {
1491 struct inode *inode;
1492 struct dentry *dentry;
1493 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1494 if (!dentry)
1495 return -ENOMEM;
1496
1497 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1498 if (!inode)
1499 return -ENOMEM;
1500
1501 inode->i_fop = &sel_initcon_ops;
1502 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1503 d_add(dentry, inode);
1504 }
1505
1506 return 0;
1507 }
1508
1509 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1510 {
1511 return a / b - (a % b < 0);
1512 }
1513
1514 static inline unsigned long sel_class_to_ino(u16 class)
1515 {
1516 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1517 }
1518
1519 static inline u16 sel_ino_to_class(unsigned long ino)
1520 {
1521 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1522 }
1523
1524 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1525 {
1526 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1527 }
1528
1529 static inline u32 sel_ino_to_perm(unsigned long ino)
1530 {
1531 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1532 }
1533
1534 static ssize_t sel_read_class(struct file *file, char __user *buf,
1535 size_t count, loff_t *ppos)
1536 {
1537 ssize_t rc, len;
1538 char *page;
1539 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1540
1541 page = (char *)__get_free_page(GFP_KERNEL);
1542 if (!page)
1543 return -ENOMEM;
1544
1545 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1546 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1547 free_page((unsigned long)page);
1548
1549 return rc;
1550 }
1551
1552 static const struct file_operations sel_class_ops = {
1553 .read = sel_read_class,
1554 .llseek = generic_file_llseek,
1555 };
1556
1557 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1558 size_t count, loff_t *ppos)
1559 {
1560 ssize_t rc, len;
1561 char *page;
1562 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1563
1564 page = (char *)__get_free_page(GFP_KERNEL);
1565 if (!page)
1566 return -ENOMEM;
1567
1568 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1569 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1570 free_page((unsigned long)page);
1571
1572 return rc;
1573 }
1574
1575 static const struct file_operations sel_perm_ops = {
1576 .read = sel_read_perm,
1577 .llseek = generic_file_llseek,
1578 };
1579
1580 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1581 size_t count, loff_t *ppos)
1582 {
1583 int value;
1584 char tmpbuf[TMPBUFLEN];
1585 ssize_t length;
1586 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1587
1588 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1589 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1590
1591 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1592 }
1593
1594 static const struct file_operations sel_policycap_ops = {
1595 .read = sel_read_policycap,
1596 .llseek = generic_file_llseek,
1597 };
1598
1599 static int sel_make_perm_files(char *objclass, int classvalue,
1600 struct dentry *dir)
1601 {
1602 int i, rc, nperms;
1603 char **perms;
1604
1605 rc = security_get_permissions(objclass, &perms, &nperms);
1606 if (rc)
1607 return rc;
1608
1609 for (i = 0; i < nperms; i++) {
1610 struct inode *inode;
1611 struct dentry *dentry;
1612
1613 rc = -ENOMEM;
1614 dentry = d_alloc_name(dir, perms[i]);
1615 if (!dentry)
1616 goto out;
1617
1618 rc = -ENOMEM;
1619 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1620 if (!inode)
1621 goto out;
1622
1623 inode->i_fop = &sel_perm_ops;
1624 /* i+1 since perm values are 1-indexed */
1625 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1626 d_add(dentry, inode);
1627 }
1628 rc = 0;
1629 out:
1630 for (i = 0; i < nperms; i++)
1631 kfree(perms[i]);
1632 kfree(perms);
1633 return rc;
1634 }
1635
1636 static int sel_make_class_dir_entries(char *classname, int index,
1637 struct dentry *dir)
1638 {
1639 struct dentry *dentry = NULL;
1640 struct inode *inode = NULL;
1641 int rc;
1642
1643 dentry = d_alloc_name(dir, "index");
1644 if (!dentry)
1645 return -ENOMEM;
1646
1647 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1648 if (!inode)
1649 return -ENOMEM;
1650
1651 inode->i_fop = &sel_class_ops;
1652 inode->i_ino = sel_class_to_ino(index);
1653 d_add(dentry, inode);
1654
1655 dentry = d_alloc_name(dir, "perms");
1656 if (!dentry)
1657 return -ENOMEM;
1658
1659 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1660 if (rc)
1661 return rc;
1662
1663 rc = sel_make_perm_files(classname, index, dentry);
1664
1665 return rc;
1666 }
1667
1668 static void sel_remove_classes(void)
1669 {
1670 struct list_head *class_node;
1671
1672 list_for_each(class_node, &class_dir->d_subdirs) {
1673 struct dentry *class_subdir = list_entry(class_node,
1674 struct dentry, d_u.d_child);
1675 struct list_head *class_subdir_node;
1676
1677 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1678 struct dentry *d = list_entry(class_subdir_node,
1679 struct dentry, d_u.d_child);
1680
1681 if (d->d_inode)
1682 if (d->d_inode->i_mode & S_IFDIR)
1683 sel_remove_entries(d);
1684 }
1685
1686 sel_remove_entries(class_subdir);
1687 }
1688
1689 sel_remove_entries(class_dir);
1690 }
1691
1692 static int sel_make_classes(void)
1693 {
1694 int rc, nclasses, i;
1695 char **classes;
1696
1697 /* delete any existing entries */
1698 sel_remove_classes();
1699
1700 rc = security_get_classes(&classes, &nclasses);
1701 if (rc)
1702 return rc;
1703
1704 /* +2 since classes are 1-indexed */
1705 last_class_ino = sel_class_to_ino(nclasses + 2);
1706
1707 for (i = 0; i < nclasses; i++) {
1708 struct dentry *class_name_dir;
1709
1710 rc = -ENOMEM;
1711 class_name_dir = d_alloc_name(class_dir, classes[i]);
1712 if (!class_name_dir)
1713 goto out;
1714
1715 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1716 &last_class_ino);
1717 if (rc)
1718 goto out;
1719
1720 /* i+1 since class values are 1-indexed */
1721 rc = sel_make_class_dir_entries(classes[i], i + 1,
1722 class_name_dir);
1723 if (rc)
1724 goto out;
1725 }
1726 rc = 0;
1727 out:
1728 for (i = 0; i < nclasses; i++)
1729 kfree(classes[i]);
1730 kfree(classes);
1731 return rc;
1732 }
1733
1734 static int sel_make_policycap(void)
1735 {
1736 unsigned int iter;
1737 struct dentry *dentry = NULL;
1738 struct inode *inode = NULL;
1739
1740 sel_remove_entries(policycap_dir);
1741
1742 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1743 if (iter < ARRAY_SIZE(policycap_names))
1744 dentry = d_alloc_name(policycap_dir,
1745 policycap_names[iter]);
1746 else
1747 dentry = d_alloc_name(policycap_dir, "unknown");
1748
1749 if (dentry == NULL)
1750 return -ENOMEM;
1751
1752 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1753 if (inode == NULL)
1754 return -ENOMEM;
1755
1756 inode->i_fop = &sel_policycap_ops;
1757 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1758 d_add(dentry, inode);
1759 }
1760
1761 return 0;
1762 }
1763
1764 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1765 unsigned long *ino)
1766 {
1767 struct inode *inode;
1768
1769 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1770 if (!inode)
1771 return -ENOMEM;
1772
1773 inode->i_op = &simple_dir_inode_operations;
1774 inode->i_fop = &simple_dir_operations;
1775 inode->i_ino = ++(*ino);
1776 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1777 inc_nlink(inode);
1778 d_add(dentry, inode);
1779 /* bump link count on parent directory, too */
1780 inc_nlink(dir);
1781
1782 return 0;
1783 }
1784
1785 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1786 {
1787 int ret;
1788 struct dentry *dentry;
1789 struct inode *inode, *root_inode;
1790 struct inode_security_struct *isec;
1791
1792 static struct tree_descr selinux_files[] = {
1793 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1794 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1795 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1799 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1800 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1801 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1802 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1803 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1804 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1806 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1807 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1808 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1809 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1810 /* last one */ {""}
1811 };
1812 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1813 if (ret)
1814 goto err;
1815
1816 root_inode = sb->s_root->d_inode;
1817
1818 ret = -ENOMEM;
1819 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1820 if (!dentry)
1821 goto err;
1822
1823 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1824 if (ret)
1825 goto err;
1826
1827 bool_dir = dentry;
1828
1829 ret = -ENOMEM;
1830 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1831 if (!dentry)
1832 goto err;
1833
1834 ret = -ENOMEM;
1835 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1836 if (!inode)
1837 goto err;
1838
1839 inode->i_ino = ++sel_last_ino;
1840 isec = (struct inode_security_struct *)inode->i_security;
1841 isec->sid = SECINITSID_DEVNULL;
1842 isec->sclass = SECCLASS_CHR_FILE;
1843 isec->initialized = 1;
1844
1845 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1846 d_add(dentry, inode);
1847 selinux_null = dentry;
1848
1849 ret = -ENOMEM;
1850 dentry = d_alloc_name(sb->s_root, "avc");
1851 if (!dentry)
1852 goto err;
1853
1854 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1855 if (ret)
1856 goto err;
1857
1858 ret = sel_make_avc_files(dentry);
1859 if (ret)
1860 goto err;
1861
1862 ret = -ENOMEM;
1863 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1864 if (!dentry)
1865 goto err;
1866
1867 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1868 if (ret)
1869 goto err;
1870
1871 ret = sel_make_initcon_files(dentry);
1872 if (ret)
1873 goto err;
1874
1875 ret = -ENOMEM;
1876 dentry = d_alloc_name(sb->s_root, "class");
1877 if (!dentry)
1878 goto err;
1879
1880 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1881 if (ret)
1882 goto err;
1883
1884 class_dir = dentry;
1885
1886 ret = -ENOMEM;
1887 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1888 if (!dentry)
1889 goto err;
1890
1891 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1892 if (ret)
1893 goto err;
1894
1895 policycap_dir = dentry;
1896
1897 return 0;
1898 err:
1899 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1900 __func__);
1901 return ret;
1902 }
1903
1904 static struct dentry *sel_mount(struct file_system_type *fs_type,
1905 int flags, const char *dev_name, void *data)
1906 {
1907 return mount_single(fs_type, flags, data, sel_fill_super);
1908 }
1909
1910 static struct file_system_type sel_fs_type = {
1911 .name = "selinuxfs",
1912 .mount = sel_mount,
1913 .kill_sb = kill_litter_super,
1914 };
1915
1916 struct vfsmount *selinuxfs_mount;
1917 static struct kobject *selinuxfs_kobj;
1918
1919 static int __init init_sel_fs(void)
1920 {
1921 int err;
1922
1923 if (!selinux_enabled)
1924 return 0;
1925
1926 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1927 if (!selinuxfs_kobj)
1928 return -ENOMEM;
1929
1930 err = register_filesystem(&sel_fs_type);
1931 if (err) {
1932 kobject_put(selinuxfs_kobj);
1933 return err;
1934 }
1935
1936 selinuxfs_mount = kern_mount(&sel_fs_type);
1937 if (IS_ERR(selinuxfs_mount)) {
1938 printk(KERN_ERR "selinuxfs: could not mount!\n");
1939 err = PTR_ERR(selinuxfs_mount);
1940 selinuxfs_mount = NULL;
1941 }
1942
1943 return err;
1944 }
1945
1946 __initcall(init_sel_fs);
1947
1948 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1949 void exit_sel_fs(void)
1950 {
1951 kobject_put(selinuxfs_kobj);
1952 unregister_filesystem(&sel_fs_type);
1953 }
1954 #endif
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