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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[zen-stable.git] / security / selinux / selinuxfs.c
blobf46658722c78d2b798a2d77634a08df968b2d0da
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul@paul-moore.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 /* Policy capability filenames */
45 static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms"
48 };
49
50 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
51
52 static int __init checkreqprot_setup(char *str)
53 {
54 unsigned long checkreqprot;
55 if (!strict_strtoul(str, 0, &checkreqprot))
56 selinux_checkreqprot = checkreqprot ? 1 : 0;
57 return 1;
58 }
59 __setup("checkreqprot=", checkreqprot_setup);
60
61 static DEFINE_MUTEX(sel_mutex);
62
63 /* global data for booleans */
64 static struct dentry *bool_dir;
65 static int bool_num;
66 static char **bool_pending_names;
67 static int *bool_pending_values;
68
69 /* global data for classes */
70 static struct dentry *class_dir;
71 static unsigned long last_class_ino;
72
73 static char policy_opened;
74
75 /* global data for policy capabilities */
76 static struct dentry *policycap_dir;
77
78 /* Check whether a task is allowed to use a security operation. */
79 static int task_has_security(struct task_struct *tsk,
80 u32 perms)
81 {
82 const struct task_security_struct *tsec;
83 u32 sid = 0;
84
85 rcu_read_lock();
86 tsec = __task_cred(tsk)->security;
87 if (tsec)
88 sid = tsec->sid;
89 rcu_read_unlock();
90 if (!tsec)
91 return -EACCES;
92
93 return avc_has_perm(sid, SECINITSID_SECURITY,
94 SECCLASS_SECURITY, perms, NULL);
95 }
96
97 enum sel_inos {
98 SEL_ROOT_INO = 2,
99 SEL_LOAD, /* load policy */
100 SEL_ENFORCE, /* get or set enforcing status */
101 SEL_CONTEXT, /* validate context */
102 SEL_ACCESS, /* compute access decision */
103 SEL_CREATE, /* compute create labeling decision */
104 SEL_RELABEL, /* compute relabeling decision */
105 SEL_USER, /* compute reachable user contexts */
106 SEL_POLICYVERS, /* return policy version for this kernel */
107 SEL_COMMIT_BOOLS, /* commit new boolean values */
108 SEL_MLS, /* return if MLS policy is enabled */
109 SEL_DISABLE, /* disable SELinux until next reboot */
110 SEL_MEMBER, /* compute polyinstantiation membership decision */
111 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
113 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
115 SEL_STATUS, /* export current status using mmap() */
116 SEL_POLICY, /* allow userspace to read the in kernel policy */
117 SEL_INO_NEXT, /* The next inode number to use */
118 };
119
120 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
121
122 #define SEL_INITCON_INO_OFFSET 0x01000000
123 #define SEL_BOOL_INO_OFFSET 0x02000000
124 #define SEL_CLASS_INO_OFFSET 0x04000000
125 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
126 #define SEL_INO_MASK 0x00ffffff
127
128 #define TMPBUFLEN 12
129 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130 size_t count, loff_t *ppos)
131 {
132 char tmpbuf[TMPBUFLEN];
133 ssize_t length;
134
135 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
137 }
138
139 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
141 size_t count, loff_t *ppos)
142
143 {
144 char *page = NULL;
145 ssize_t length;
146 int new_value;
147
148 length = -ENOMEM;
149 if (count >= PAGE_SIZE)
150 goto out;
151
152 /* No partial writes. */
153 length = EINVAL;
154 if (*ppos != 0)
155 goto out;
156
157 length = -ENOMEM;
158 page = (char *)get_zeroed_page(GFP_KERNEL);
159 if (!page)
160 goto out;
161
162 length = -EFAULT;
163 if (copy_from_user(page, buf, count))
164 goto out;
165
166 length = -EINVAL;
167 if (sscanf(page, "%d", &new_value) != 1)
168 goto out;
169
170 if (new_value != selinux_enforcing) {
171 length = task_has_security(current, SECURITY__SETENFORCE);
172 if (length)
173 goto out;
174 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176 new_value, selinux_enforcing,
177 audit_get_loginuid(current),
178 audit_get_sessionid(current));
179 selinux_enforcing = new_value;
180 if (selinux_enforcing)
181 avc_ss_reset(0);
182 selnl_notify_setenforce(selinux_enforcing);
183 selinux_status_update_setenforce(selinux_enforcing);
184 }
185 length = count;
186 out:
187 free_page((unsigned long) page);
188 return length;
189 }
190 #else
191 #define sel_write_enforce NULL
192 #endif
193
194 static const struct file_operations sel_enforce_ops = {
195 .read = sel_read_enforce,
196 .write = sel_write_enforce,
197 .llseek = generic_file_llseek,
198 };
199
200 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201 size_t count, loff_t *ppos)
202 {
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown() : !security_get_allow_unknown();
208
209 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211 }
212
213 static const struct file_operations sel_handle_unknown_ops = {
214 .read = sel_read_handle_unknown,
215 .llseek = generic_file_llseek,
216 };
217
218 static int sel_open_handle_status(struct inode *inode, struct file *filp)
219 {
220 struct page *status = selinux_kernel_status_page();
221
222 if (!status)
223 return -ENOMEM;
224
225 filp->private_data = status;
226
227 return 0;
228 }
229
230 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231 size_t count, loff_t *ppos)
232 {
233 struct page *status = filp->private_data;
234
235 BUG_ON(!status);
236
237 return simple_read_from_buffer(buf, count, ppos,
238 page_address(status),
239 sizeof(struct selinux_kernel_status));
240 }
241
242 static int sel_mmap_handle_status(struct file *filp,
243 struct vm_area_struct *vma)
244 {
245 struct page *status = filp->private_data;
246 unsigned long size = vma->vm_end - vma->vm_start;
247
248 BUG_ON(!status);
249
250 /* only allows one page from the head */
251 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
252 return -EIO;
253 /* disallow writable mapping */
254 if (vma->vm_flags & VM_WRITE)
255 return -EPERM;
256 /* disallow mprotect() turns it into writable */
257 vma->vm_flags &= ~VM_MAYWRITE;
258
259 return remap_pfn_range(vma, vma->vm_start,
260 page_to_pfn(status),
261 size, vma->vm_page_prot);
262 }
263
264 static const struct file_operations sel_handle_status_ops = {
265 .open = sel_open_handle_status,
266 .read = sel_read_handle_status,
267 .mmap = sel_mmap_handle_status,
268 .llseek = generic_file_llseek,
269 };
270
271 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
272 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
273 size_t count, loff_t *ppos)
274
275 {
276 char *page = NULL;
277 ssize_t length;
278 int new_value;
279
280 length = -ENOMEM;
281 if (count >= PAGE_SIZE)
282 goto out;
283
284 /* No partial writes. */
285 length = -EINVAL;
286 if (*ppos != 0)
287 goto out;
288
289 length = -ENOMEM;
290 page = (char *)get_zeroed_page(GFP_KERNEL);
291 if (!page)
292 goto out;
293
294 length = -EFAULT;
295 if (copy_from_user(page, buf, count))
296 goto out;
297
298 length = -EINVAL;
299 if (sscanf(page, "%d", &new_value) != 1)
300 goto out;
301
302 if (new_value) {
303 length = selinux_disable();
304 if (length)
305 goto out;
306 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
307 "selinux=0 auid=%u ses=%u",
308 audit_get_loginuid(current),
309 audit_get_sessionid(current));
310 }
311
312 length = count;
313 out:
314 free_page((unsigned long) page);
315 return length;
316 }
317 #else
318 #define sel_write_disable NULL
319 #endif
320
321 static const struct file_operations sel_disable_ops = {
322 .write = sel_write_disable,
323 .llseek = generic_file_llseek,
324 };
325
326 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
327 size_t count, loff_t *ppos)
328 {
329 char tmpbuf[TMPBUFLEN];
330 ssize_t length;
331
332 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
333 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
334 }
335
336 static const struct file_operations sel_policyvers_ops = {
337 .read = sel_read_policyvers,
338 .llseek = generic_file_llseek,
339 };
340
341 /* declaration for sel_write_load */
342 static int sel_make_bools(void);
343 static int sel_make_classes(void);
344 static int sel_make_policycap(void);
345
346 /* declaration for sel_make_class_dirs */
347 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
348 unsigned long *ino);
349
350 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
351 size_t count, loff_t *ppos)
352 {
353 char tmpbuf[TMPBUFLEN];
354 ssize_t length;
355
356 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
357 security_mls_enabled());
358 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
359 }
360
361 static const struct file_operations sel_mls_ops = {
362 .read = sel_read_mls,
363 .llseek = generic_file_llseek,
364 };
365
366 struct policy_load_memory {
367 size_t len;
368 void *data;
369 };
370
371 static int sel_open_policy(struct inode *inode, struct file *filp)
372 {
373 struct policy_load_memory *plm = NULL;
374 int rc;
375
376 BUG_ON(filp->private_data);
377
378 mutex_lock(&sel_mutex);
379
380 rc = task_has_security(current, SECURITY__READ_POLICY);
381 if (rc)
382 goto err;
383
384 rc = -EBUSY;
385 if (policy_opened)
386 goto err;
387
388 rc = -ENOMEM;
389 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
390 if (!plm)
391 goto err;
392
393 if (i_size_read(inode) != security_policydb_len()) {
394 mutex_lock(&inode->i_mutex);
395 i_size_write(inode, security_policydb_len());
396 mutex_unlock(&inode->i_mutex);
397 }
398
399 rc = security_read_policy(&plm->data, &plm->len);
400 if (rc)
401 goto err;
402
403 policy_opened = 1;
404
405 filp->private_data = plm;
406
407 mutex_unlock(&sel_mutex);
408
409 return 0;
410 err:
411 mutex_unlock(&sel_mutex);
412
413 if (plm)
414 vfree(plm->data);
415 kfree(plm);
416 return rc;
417 }
418
419 static int sel_release_policy(struct inode *inode, struct file *filp)
420 {
421 struct policy_load_memory *plm = filp->private_data;
422
423 BUG_ON(!plm);
424
425 policy_opened = 0;
426
427 vfree(plm->data);
428 kfree(plm);
429
430 return 0;
431 }
432
433 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
434 size_t count, loff_t *ppos)
435 {
436 struct policy_load_memory *plm = filp->private_data;
437 int ret;
438
439 mutex_lock(&sel_mutex);
440
441 ret = task_has_security(current, SECURITY__READ_POLICY);
442 if (ret)
443 goto out;
444
445 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
446 out:
447 mutex_unlock(&sel_mutex);
448 return ret;
449 }
450
451 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
452 struct vm_fault *vmf)
453 {
454 struct policy_load_memory *plm = vma->vm_file->private_data;
455 unsigned long offset;
456 struct page *page;
457
458 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
459 return VM_FAULT_SIGBUS;
460
461 offset = vmf->pgoff << PAGE_SHIFT;
462 if (offset >= roundup(plm->len, PAGE_SIZE))
463 return VM_FAULT_SIGBUS;
464
465 page = vmalloc_to_page(plm->data + offset);
466 get_page(page);
467
468 vmf->page = page;
469
470 return 0;
471 }
472
473 static struct vm_operations_struct sel_mmap_policy_ops = {
474 .fault = sel_mmap_policy_fault,
475 .page_mkwrite = sel_mmap_policy_fault,
476 };
477
478 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
479 {
480 if (vma->vm_flags & VM_SHARED) {
481 /* do not allow mprotect to make mapping writable */
482 vma->vm_flags &= ~VM_MAYWRITE;
483
484 if (vma->vm_flags & VM_WRITE)
485 return -EACCES;
486 }
487
488 vma->vm_flags |= VM_RESERVED;
489 vma->vm_ops = &sel_mmap_policy_ops;
490
491 return 0;
492 }
493
494 static const struct file_operations sel_policy_ops = {
495 .open = sel_open_policy,
496 .read = sel_read_policy,
497 .mmap = sel_mmap_policy,
498 .release = sel_release_policy,
499 };
500
501 static ssize_t sel_write_load(struct file *file, const char __user *buf,
502 size_t count, loff_t *ppos)
503
504 {
505 ssize_t length;
506 void *data = NULL;
507
508 mutex_lock(&sel_mutex);
509
510 length = task_has_security(current, SECURITY__LOAD_POLICY);
511 if (length)
512 goto out;
513
514 /* No partial writes. */
515 length = -EINVAL;
516 if (*ppos != 0)
517 goto out;
518
519 length = -EFBIG;
520 if (count > 64 * 1024 * 1024)
521 goto out;
522
523 length = -ENOMEM;
524 data = vmalloc(count);
525 if (!data)
526 goto out;
527
528 length = -EFAULT;
529 if (copy_from_user(data, buf, count) != 0)
530 goto out;
531
532 length = security_load_policy(data, count);
533 if (length)
534 goto out;
535
536 length = sel_make_bools();
537 if (length)
538 goto out1;
539
540 length = sel_make_classes();
541 if (length)
542 goto out1;
543
544 length = sel_make_policycap();
545 if (length)
546 goto out1;
547
548 length = count;
549
550 out1:
551 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
552 "policy loaded auid=%u ses=%u",
553 audit_get_loginuid(current),
554 audit_get_sessionid(current));
555 out:
556 mutex_unlock(&sel_mutex);
557 vfree(data);
558 return length;
559 }
560
561 static const struct file_operations sel_load_ops = {
562 .write = sel_write_load,
563 .llseek = generic_file_llseek,
564 };
565
566 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
567 {
568 char *canon = NULL;
569 u32 sid, len;
570 ssize_t length;
571
572 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
573 if (length)
574 goto out;
575
576 length = security_context_to_sid(buf, size, &sid);
577 if (length)
578 goto out;
579
580 length = security_sid_to_context(sid, &canon, &len);
581 if (length)
582 goto out;
583
584 length = -ERANGE;
585 if (len > SIMPLE_TRANSACTION_LIMIT) {
586 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
587 "payload max\n", __func__, len);
588 goto out;
589 }
590
591 memcpy(buf, canon, len);
592 length = len;
593 out:
594 kfree(canon);
595 return length;
596 }
597
598 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
599 size_t count, loff_t *ppos)
600 {
601 char tmpbuf[TMPBUFLEN];
602 ssize_t length;
603
604 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
605 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
606 }
607
608 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
609 size_t count, loff_t *ppos)
610 {
611 char *page = NULL;
612 ssize_t length;
613 unsigned int new_value;
614
615 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
616 if (length)
617 goto out;
618
619 length = -ENOMEM;
620 if (count >= PAGE_SIZE)
621 goto out;
622
623 /* No partial writes. */
624 length = -EINVAL;
625 if (*ppos != 0)
626 goto out;
627
628 length = -ENOMEM;
629 page = (char *)get_zeroed_page(GFP_KERNEL);
630 if (!page)
631 goto out;
632
633 length = -EFAULT;
634 if (copy_from_user(page, buf, count))
635 goto out;
636
637 length = -EINVAL;
638 if (sscanf(page, "%u", &new_value) != 1)
639 goto out;
640
641 selinux_checkreqprot = new_value ? 1 : 0;
642 length = count;
643 out:
644 free_page((unsigned long) page);
645 return length;
646 }
647 static const struct file_operations sel_checkreqprot_ops = {
648 .read = sel_read_checkreqprot,
649 .write = sel_write_checkreqprot,
650 .llseek = generic_file_llseek,
651 };
652
653 /*
654 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
655 */
656 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
657 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
658 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
659 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
661
662 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
663 [SEL_ACCESS] = sel_write_access,
664 [SEL_CREATE] = sel_write_create,
665 [SEL_RELABEL] = sel_write_relabel,
666 [SEL_USER] = sel_write_user,
667 [SEL_MEMBER] = sel_write_member,
668 [SEL_CONTEXT] = sel_write_context,
669 };
670
671 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
672 {
673 ino_t ino = file->f_path.dentry->d_inode->i_ino;
674 char *data;
675 ssize_t rv;
676
677 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
678 return -EINVAL;
679
680 data = simple_transaction_get(file, buf, size);
681 if (IS_ERR(data))
682 return PTR_ERR(data);
683
684 rv = write_op[ino](file, data, size);
685 if (rv > 0) {
686 simple_transaction_set(file, rv);
687 rv = size;
688 }
689 return rv;
690 }
691
692 static const struct file_operations transaction_ops = {
693 .write = selinux_transaction_write,
694 .read = simple_transaction_read,
695 .release = simple_transaction_release,
696 .llseek = generic_file_llseek,
697 };
698
699 /*
700 * payload - write methods
701 * If the method has a response, the response should be put in buf,
702 * and the length returned. Otherwise return 0 or and -error.
703 */
704
705 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
706 {
707 char *scon = NULL, *tcon = NULL;
708 u32 ssid, tsid;
709 u16 tclass;
710 struct av_decision avd;
711 ssize_t length;
712
713 length = task_has_security(current, SECURITY__COMPUTE_AV);
714 if (length)
715 goto out;
716
717 length = -ENOMEM;
718 scon = kzalloc(size + 1, GFP_KERNEL);
719 if (!scon)
720 goto out;
721
722 length = -ENOMEM;
723 tcon = kzalloc(size + 1, GFP_KERNEL);
724 if (!tcon)
725 goto out;
726
727 length = -EINVAL;
728 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
729 goto out;
730
731 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
732 if (length)
733 goto out;
734
735 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
736 if (length)
737 goto out;
738
739 security_compute_av_user(ssid, tsid, tclass, &avd);
740
741 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
742 "%x %x %x %x %u %x",
743 avd.allowed, 0xffffffff,
744 avd.auditallow, avd.auditdeny,
745 avd.seqno, avd.flags);
746 out:
747 kfree(tcon);
748 kfree(scon);
749 return length;
750 }
751
752 static inline int hexcode_to_int(int code) {
753 if (code == '\0' || !isxdigit(code))
754 return -1;
755 if (isdigit(code))
756 return code - '0';
757 return tolower(code) - 'a' + 10;
758 }
759
760 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
761 {
762 char *scon = NULL, *tcon = NULL;
763 char *namebuf = NULL, *objname = NULL;
764 u32 ssid, tsid, newsid;
765 u16 tclass;
766 ssize_t length;
767 char *newcon = NULL;
768 u32 len;
769 int nargs;
770
771 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
772 if (length)
773 goto out;
774
775 length = -ENOMEM;
776 scon = kzalloc(size + 1, GFP_KERNEL);
777 if (!scon)
778 goto out;
779
780 length = -ENOMEM;
781 tcon = kzalloc(size + 1, GFP_KERNEL);
782 if (!tcon)
783 goto out;
784
785 length = -ENOMEM;
786 namebuf = kzalloc(size + 1, GFP_KERNEL);
787 if (!namebuf)
788 goto out;
789
790 length = -EINVAL;
791 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
792 if (nargs < 3 || nargs > 4)
793 goto out;
794 if (nargs == 4) {
795 /*
796 * If and when the name of new object to be queried contains
797 * either whitespace or multibyte characters, they shall be
798 * encoded based on the percentage-encoding rule.
799 * If not encoded, the sscanf logic picks up only left-half
800 * of the supplied name; splitted by a whitespace unexpectedly.
801 */
802 char *r, *w;
803 int c1, c2;
804
805 r = w = namebuf;
806 do {
807 c1 = *r++;
808 if (c1 == '+')
809 c1 = ' ';
810 else if (c1 == '%') {
811 if ((c1 = hexcode_to_int(*r++)) < 0)
812 goto out;
813 if ((c2 = hexcode_to_int(*r++)) < 0)
814 goto out;
815 c1 = (c1 << 4) | c2;
816 }
817 *w++ = c1;
818 } while (c1 != '\0');
819
820 objname = namebuf;
821 }
822
823 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
824 if (length)
825 goto out;
826
827 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
828 if (length)
829 goto out;
830
831 length = security_transition_sid_user(ssid, tsid, tclass,
832 objname, &newsid);
833 if (length)
834 goto out;
835
836 length = security_sid_to_context(newsid, &newcon, &len);
837 if (length)
838 goto out;
839
840 length = -ERANGE;
841 if (len > SIMPLE_TRANSACTION_LIMIT) {
842 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
843 "payload max\n", __func__, len);
844 goto out;
845 }
846
847 memcpy(buf, newcon, len);
848 length = len;
849 out:
850 kfree(newcon);
851 kfree(namebuf);
852 kfree(tcon);
853 kfree(scon);
854 return length;
855 }
856
857 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
858 {
859 char *scon = NULL, *tcon = NULL;
860 u32 ssid, tsid, newsid;
861 u16 tclass;
862 ssize_t length;
863 char *newcon = NULL;
864 u32 len;
865
866 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
867 if (length)
868 goto out;
869
870 length = -ENOMEM;
871 scon = kzalloc(size + 1, GFP_KERNEL);
872 if (!scon)
873 goto out;
874
875 length = -ENOMEM;
876 tcon = kzalloc(size + 1, GFP_KERNEL);
877 if (!tcon)
878 goto out;
879
880 length = -EINVAL;
881 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
882 goto out;
883
884 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
885 if (length)
886 goto out;
887
888 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
889 if (length)
890 goto out;
891
892 length = security_change_sid(ssid, tsid, tclass, &newsid);
893 if (length)
894 goto out;
895
896 length = security_sid_to_context(newsid, &newcon, &len);
897 if (length)
898 goto out;
899
900 length = -ERANGE;
901 if (len > SIMPLE_TRANSACTION_LIMIT)
902 goto out;
903
904 memcpy(buf, newcon, len);
905 length = len;
906 out:
907 kfree(newcon);
908 kfree(tcon);
909 kfree(scon);
910 return length;
911 }
912
913 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
914 {
915 char *con = NULL, *user = NULL, *ptr;
916 u32 sid, *sids = NULL;
917 ssize_t length;
918 char *newcon;
919 int i, rc;
920 u32 len, nsids;
921
922 length = task_has_security(current, SECURITY__COMPUTE_USER);
923 if (length)
924 goto out;
925
926 length = -ENOMEM;
927 con = kzalloc(size + 1, GFP_KERNEL);
928 if (!con)
929 goto out;
930
931 length = -ENOMEM;
932 user = kzalloc(size + 1, GFP_KERNEL);
933 if (!user)
934 goto out;
935
936 length = -EINVAL;
937 if (sscanf(buf, "%s %s", con, user) != 2)
938 goto out;
939
940 length = security_context_to_sid(con, strlen(con) + 1, &sid);
941 if (length)
942 goto out;
943
944 length = security_get_user_sids(sid, user, &sids, &nsids);
945 if (length)
946 goto out;
947
948 length = sprintf(buf, "%u", nsids) + 1;
949 ptr = buf + length;
950 for (i = 0; i < nsids; i++) {
951 rc = security_sid_to_context(sids[i], &newcon, &len);
952 if (rc) {
953 length = rc;
954 goto out;
955 }
956 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
957 kfree(newcon);
958 length = -ERANGE;
959 goto out;
960 }
961 memcpy(ptr, newcon, len);
962 kfree(newcon);
963 ptr += len;
964 length += len;
965 }
966 out:
967 kfree(sids);
968 kfree(user);
969 kfree(con);
970 return length;
971 }
972
973 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
974 {
975 char *scon = NULL, *tcon = NULL;
976 u32 ssid, tsid, newsid;
977 u16 tclass;
978 ssize_t length;
979 char *newcon = NULL;
980 u32 len;
981
982 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
983 if (length)
984 goto out;
985
986 length = -ENOMEM;
987 scon = kzalloc(size + 1, GFP_KERNEL);
988 if (!scon)
989 goto out;
990
991 length = -ENOMEM;
992 tcon = kzalloc(size + 1, GFP_KERNEL);
993 if (!tcon)
994 goto out;
995
996 length = -EINVAL;
997 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
998 goto out;
999
1000 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
1001 if (length)
1002 goto out;
1003
1004 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
1005 if (length)
1006 goto out;
1007
1008 length = security_member_sid(ssid, tsid, tclass, &newsid);
1009 if (length)
1010 goto out;
1011
1012 length = security_sid_to_context(newsid, &newcon, &len);
1013 if (length)
1014 goto out;
1015
1016 length = -ERANGE;
1017 if (len > SIMPLE_TRANSACTION_LIMIT) {
1018 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1019 "payload max\n", __func__, len);
1020 goto out;
1021 }
1022
1023 memcpy(buf, newcon, len);
1024 length = len;
1025 out:
1026 kfree(newcon);
1027 kfree(tcon);
1028 kfree(scon);
1029 return length;
1030 }
1031
1032 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1033 {
1034 struct inode *ret = new_inode(sb);
1035
1036 if (ret) {
1037 ret->i_mode = mode;
1038 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1039 }
1040 return ret;
1041 }
1042
1043 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1044 size_t count, loff_t *ppos)
1045 {
1046 char *page = NULL;
1047 ssize_t length;
1048 ssize_t ret;
1049 int cur_enforcing;
1050 struct inode *inode = filep->f_path.dentry->d_inode;
1051 unsigned index = inode->i_ino & SEL_INO_MASK;
1052 const char *name = filep->f_path.dentry->d_name.name;
1053
1054 mutex_lock(&sel_mutex);
1055
1056 ret = -EINVAL;
1057 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1058 goto out;
1059
1060 ret = -ENOMEM;
1061 page = (char *)get_zeroed_page(GFP_KERNEL);
1062 if (!page)
1063 goto out;
1064
1065 cur_enforcing = security_get_bool_value(index);
1066 if (cur_enforcing < 0) {
1067 ret = cur_enforcing;
1068 goto out;
1069 }
1070 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1071 bool_pending_values[index]);
1072 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1073 out:
1074 mutex_unlock(&sel_mutex);
1075 free_page((unsigned long)page);
1076 return ret;
1077 }
1078
1079 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1080 size_t count, loff_t *ppos)
1081 {
1082 char *page = NULL;
1083 ssize_t length;
1084 int new_value;
1085 struct inode *inode = filep->f_path.dentry->d_inode;
1086 unsigned index = inode->i_ino & SEL_INO_MASK;
1087 const char *name = filep->f_path.dentry->d_name.name;
1088
1089 mutex_lock(&sel_mutex);
1090
1091 length = task_has_security(current, SECURITY__SETBOOL);
1092 if (length)
1093 goto out;
1094
1095 length = -EINVAL;
1096 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1097 goto out;
1098
1099 length = -ENOMEM;
1100 if (count >= PAGE_SIZE)
1101 goto out;
1102
1103 /* No partial writes. */
1104 length = -EINVAL;
1105 if (*ppos != 0)
1106 goto out;
1107
1108 length = -ENOMEM;
1109 page = (char *)get_zeroed_page(GFP_KERNEL);
1110 if (!page)
1111 goto out;
1112
1113 length = -EFAULT;
1114 if (copy_from_user(page, buf, count))
1115 goto out;
1116
1117 length = -EINVAL;
1118 if (sscanf(page, "%d", &new_value) != 1)
1119 goto out;
1120
1121 if (new_value)
1122 new_value = 1;
1123
1124 bool_pending_values[index] = new_value;
1125 length = count;
1126
1127 out:
1128 mutex_unlock(&sel_mutex);
1129 free_page((unsigned long) page);
1130 return length;
1131 }
1132
1133 static const struct file_operations sel_bool_ops = {
1134 .read = sel_read_bool,
1135 .write = sel_write_bool,
1136 .llseek = generic_file_llseek,
1137 };
1138
1139 static ssize_t sel_commit_bools_write(struct file *filep,
1140 const char __user *buf,
1141 size_t count, loff_t *ppos)
1142 {
1143 char *page = NULL;
1144 ssize_t length;
1145 int new_value;
1146
1147 mutex_lock(&sel_mutex);
1148
1149 length = task_has_security(current, SECURITY__SETBOOL);
1150 if (length)
1151 goto out;
1152
1153 length = -ENOMEM;
1154 if (count >= PAGE_SIZE)
1155 goto out;
1156
1157 /* No partial writes. */
1158 length = -EINVAL;
1159 if (*ppos != 0)
1160 goto out;
1161
1162 length = -ENOMEM;
1163 page = (char *)get_zeroed_page(GFP_KERNEL);
1164 if (!page)
1165 goto out;
1166
1167 length = -EFAULT;
1168 if (copy_from_user(page, buf, count))
1169 goto out;
1170
1171 length = -EINVAL;
1172 if (sscanf(page, "%d", &new_value) != 1)
1173 goto out;
1174
1175 length = 0;
1176 if (new_value && bool_pending_values)
1177 length = security_set_bools(bool_num, bool_pending_values);
1178
1179 if (!length)
1180 length = count;
1181
1182 out:
1183 mutex_unlock(&sel_mutex);
1184 free_page((unsigned long) page);
1185 return length;
1186 }
1187
1188 static const struct file_operations sel_commit_bools_ops = {
1189 .write = sel_commit_bools_write,
1190 .llseek = generic_file_llseek,
1191 };
1192
1193 static void sel_remove_entries(struct dentry *de)
1194 {
1195 struct list_head *node;
1196
1197 spin_lock(&de->d_lock);
1198 node = de->d_subdirs.next;
1199 while (node != &de->d_subdirs) {
1200 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1201
1202 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1203 list_del_init(node);
1204
1205 if (d->d_inode) {
1206 dget_dlock(d);
1207 spin_unlock(&de->d_lock);
1208 spin_unlock(&d->d_lock);
1209 d_delete(d);
1210 simple_unlink(de->d_inode, d);
1211 dput(d);
1212 spin_lock(&de->d_lock);
1213 } else
1214 spin_unlock(&d->d_lock);
1215 node = de->d_subdirs.next;
1216 }
1217
1218 spin_unlock(&de->d_lock);
1219 }
1220
1221 #define BOOL_DIR_NAME "booleans"
1222
1223 static int sel_make_bools(void)
1224 {
1225 int i, ret;
1226 ssize_t len;
1227 struct dentry *dentry = NULL;
1228 struct dentry *dir = bool_dir;
1229 struct inode *inode = NULL;
1230 struct inode_security_struct *isec;
1231 char **names = NULL, *page;
1232 int num;
1233 int *values = NULL;
1234 u32 sid;
1235
1236 /* remove any existing files */
1237 for (i = 0; i < bool_num; i++)
1238 kfree(bool_pending_names[i]);
1239 kfree(bool_pending_names);
1240 kfree(bool_pending_values);
1241 bool_pending_names = NULL;
1242 bool_pending_values = NULL;
1243
1244 sel_remove_entries(dir);
1245
1246 ret = -ENOMEM;
1247 page = (char *)get_zeroed_page(GFP_KERNEL);
1248 if (!page)
1249 goto out;
1250
1251 ret = security_get_bools(&num, &names, &values);
1252 if (ret)
1253 goto out;
1254
1255 for (i = 0; i < num; i++) {
1256 ret = -ENOMEM;
1257 dentry = d_alloc_name(dir, names[i]);
1258 if (!dentry)
1259 goto out;
1260
1261 ret = -ENOMEM;
1262 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1263 if (!inode)
1264 goto out;
1265
1266 ret = -EINVAL;
1267 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1268 if (len < 0)
1269 goto out;
1270
1271 ret = -ENAMETOOLONG;
1272 if (len >= PAGE_SIZE)
1273 goto out;
1274
1275 isec = (struct inode_security_struct *)inode->i_security;
1276 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1277 if (ret)
1278 goto out;
1279
1280 isec->sid = sid;
1281 isec->initialized = 1;
1282 inode->i_fop = &sel_bool_ops;
1283 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1284 d_add(dentry, inode);
1285 }
1286 bool_num = num;
1287 bool_pending_names = names;
1288 bool_pending_values = values;
1289
1290 free_page((unsigned long)page);
1291 return 0;
1292 out:
1293 free_page((unsigned long)page);
1294
1295 if (names) {
1296 for (i = 0; i < num; i++)
1297 kfree(names[i]);
1298 kfree(names);
1299 }
1300 kfree(values);
1301 sel_remove_entries(dir);
1302
1303 return ret;
1304 }
1305
1306 #define NULL_FILE_NAME "null"
1307
1308 struct dentry *selinux_null;
1309
1310 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1311 size_t count, loff_t *ppos)
1312 {
1313 char tmpbuf[TMPBUFLEN];
1314 ssize_t length;
1315
1316 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1317 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1318 }
1319
1320 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1321 const char __user *buf,
1322 size_t count, loff_t *ppos)
1323
1324 {
1325 char *page = NULL;
1326 ssize_t ret;
1327 int new_value;
1328
1329 ret = task_has_security(current, SECURITY__SETSECPARAM);
1330 if (ret)
1331 goto out;
1332
1333 ret = -ENOMEM;
1334 if (count >= PAGE_SIZE)
1335 goto out;
1336
1337 /* No partial writes. */
1338 ret = -EINVAL;
1339 if (*ppos != 0)
1340 goto out;
1341
1342 ret = -ENOMEM;
1343 page = (char *)get_zeroed_page(GFP_KERNEL);
1344 if (!page)
1345 goto out;
1346
1347 ret = -EFAULT;
1348 if (copy_from_user(page, buf, count))
1349 goto out;
1350
1351 ret = -EINVAL;
1352 if (sscanf(page, "%u", &new_value) != 1)
1353 goto out;
1354
1355 avc_cache_threshold = new_value;
1356
1357 ret = count;
1358 out:
1359 free_page((unsigned long)page);
1360 return ret;
1361 }
1362
1363 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1364 size_t count, loff_t *ppos)
1365 {
1366 char *page;
1367 ssize_t length;
1368
1369 page = (char *)__get_free_page(GFP_KERNEL);
1370 if (!page)
1371 return -ENOMEM;
1372
1373 length = avc_get_hash_stats(page);
1374 if (length >= 0)
1375 length = simple_read_from_buffer(buf, count, ppos, page, length);
1376 free_page((unsigned long)page);
1377
1378 return length;
1379 }
1380
1381 static const struct file_operations sel_avc_cache_threshold_ops = {
1382 .read = sel_read_avc_cache_threshold,
1383 .write = sel_write_avc_cache_threshold,
1384 .llseek = generic_file_llseek,
1385 };
1386
1387 static const struct file_operations sel_avc_hash_stats_ops = {
1388 .read = sel_read_avc_hash_stats,
1389 .llseek = generic_file_llseek,
1390 };
1391
1392 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1393 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1394 {
1395 int cpu;
1396
1397 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1398 if (!cpu_possible(cpu))
1399 continue;
1400 *idx = cpu + 1;
1401 return &per_cpu(avc_cache_stats, cpu);
1402 }
1403 return NULL;
1404 }
1405
1406 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1407 {
1408 loff_t n = *pos - 1;
1409
1410 if (*pos == 0)
1411 return SEQ_START_TOKEN;
1412
1413 return sel_avc_get_stat_idx(&n);
1414 }
1415
1416 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1417 {
1418 return sel_avc_get_stat_idx(pos);
1419 }
1420
1421 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1422 {
1423 struct avc_cache_stats *st = v;
1424
1425 if (v == SEQ_START_TOKEN)
1426 seq_printf(seq, "lookups hits misses allocations reclaims "
1427 "frees\n");
1428 else {
1429 unsigned int lookups = st->lookups;
1430 unsigned int misses = st->misses;
1431 unsigned int hits = lookups - misses;
1432 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1433 hits, misses, st->allocations,
1434 st->reclaims, st->frees);
1435 }
1436 return 0;
1437 }
1438
1439 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1440 { }
1441
1442 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1443 .start = sel_avc_stats_seq_start,
1444 .next = sel_avc_stats_seq_next,
1445 .show = sel_avc_stats_seq_show,
1446 .stop = sel_avc_stats_seq_stop,
1447 };
1448
1449 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1450 {
1451 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1452 }
1453
1454 static const struct file_operations sel_avc_cache_stats_ops = {
1455 .open = sel_open_avc_cache_stats,
1456 .read = seq_read,
1457 .llseek = seq_lseek,
1458 .release = seq_release,
1459 };
1460 #endif
1461
1462 static int sel_make_avc_files(struct dentry *dir)
1463 {
1464 int i;
1465 static struct tree_descr files[] = {
1466 { "cache_threshold",
1467 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1468 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1469 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1470 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1471 #endif
1472 };
1473
1474 for (i = 0; i < ARRAY_SIZE(files); i++) {
1475 struct inode *inode;
1476 struct dentry *dentry;
1477
1478 dentry = d_alloc_name(dir, files[i].name);
1479 if (!dentry)
1480 return -ENOMEM;
1481
1482 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1483 if (!inode)
1484 return -ENOMEM;
1485
1486 inode->i_fop = files[i].ops;
1487 inode->i_ino = ++sel_last_ino;
1488 d_add(dentry, inode);
1489 }
1490
1491 return 0;
1492 }
1493
1494 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1495 size_t count, loff_t *ppos)
1496 {
1497 struct inode *inode;
1498 char *con;
1499 u32 sid, len;
1500 ssize_t ret;
1501
1502 inode = file->f_path.dentry->d_inode;
1503 sid = inode->i_ino&SEL_INO_MASK;
1504 ret = security_sid_to_context(sid, &con, &len);
1505 if (ret)
1506 return ret;
1507
1508 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1509 kfree(con);
1510 return ret;
1511 }
1512
1513 static const struct file_operations sel_initcon_ops = {
1514 .read = sel_read_initcon,
1515 .llseek = generic_file_llseek,
1516 };
1517
1518 static int sel_make_initcon_files(struct dentry *dir)
1519 {
1520 int i;
1521
1522 for (i = 1; i <= SECINITSID_NUM; i++) {
1523 struct inode *inode;
1524 struct dentry *dentry;
1525 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1526 if (!dentry)
1527 return -ENOMEM;
1528
1529 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1530 if (!inode)
1531 return -ENOMEM;
1532
1533 inode->i_fop = &sel_initcon_ops;
1534 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1535 d_add(dentry, inode);
1536 }
1537
1538 return 0;
1539 }
1540
1541 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1542 {
1543 return a / b - (a % b < 0);
1544 }
1545
1546 static inline unsigned long sel_class_to_ino(u16 class)
1547 {
1548 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1549 }
1550
1551 static inline u16 sel_ino_to_class(unsigned long ino)
1552 {
1553 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1554 }
1555
1556 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1557 {
1558 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1559 }
1560
1561 static inline u32 sel_ino_to_perm(unsigned long ino)
1562 {
1563 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1564 }
1565
1566 static ssize_t sel_read_class(struct file *file, char __user *buf,
1567 size_t count, loff_t *ppos)
1568 {
1569 ssize_t rc, len;
1570 char *page;
1571 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1572
1573 page = (char *)__get_free_page(GFP_KERNEL);
1574 if (!page)
1575 return -ENOMEM;
1576
1577 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1578 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1579 free_page((unsigned long)page);
1580
1581 return rc;
1582 }
1583
1584 static const struct file_operations sel_class_ops = {
1585 .read = sel_read_class,
1586 .llseek = generic_file_llseek,
1587 };
1588
1589 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1590 size_t count, loff_t *ppos)
1591 {
1592 ssize_t rc, len;
1593 char *page;
1594 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1595
1596 page = (char *)__get_free_page(GFP_KERNEL);
1597 if (!page)
1598 return -ENOMEM;
1599
1600 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1601 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1602 free_page((unsigned long)page);
1603
1604 return rc;
1605 }
1606
1607 static const struct file_operations sel_perm_ops = {
1608 .read = sel_read_perm,
1609 .llseek = generic_file_llseek,
1610 };
1611
1612 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1613 size_t count, loff_t *ppos)
1614 {
1615 int value;
1616 char tmpbuf[TMPBUFLEN];
1617 ssize_t length;
1618 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1619
1620 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1621 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1622
1623 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1624 }
1625
1626 static const struct file_operations sel_policycap_ops = {
1627 .read = sel_read_policycap,
1628 .llseek = generic_file_llseek,
1629 };
1630
1631 static int sel_make_perm_files(char *objclass, int classvalue,
1632 struct dentry *dir)
1633 {
1634 int i, rc, nperms;
1635 char **perms;
1636
1637 rc = security_get_permissions(objclass, &perms, &nperms);
1638 if (rc)
1639 return rc;
1640
1641 for (i = 0; i < nperms; i++) {
1642 struct inode *inode;
1643 struct dentry *dentry;
1644
1645 rc = -ENOMEM;
1646 dentry = d_alloc_name(dir, perms[i]);
1647 if (!dentry)
1648 goto out;
1649
1650 rc = -ENOMEM;
1651 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1652 if (!inode)
1653 goto out;
1654
1655 inode->i_fop = &sel_perm_ops;
1656 /* i+1 since perm values are 1-indexed */
1657 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1658 d_add(dentry, inode);
1659 }
1660 rc = 0;
1661 out:
1662 for (i = 0; i < nperms; i++)
1663 kfree(perms[i]);
1664 kfree(perms);
1665 return rc;
1666 }
1667
1668 static int sel_make_class_dir_entries(char *classname, int index,
1669 struct dentry *dir)
1670 {
1671 struct dentry *dentry = NULL;
1672 struct inode *inode = NULL;
1673 int rc;
1674
1675 dentry = d_alloc_name(dir, "index");
1676 if (!dentry)
1677 return -ENOMEM;
1678
1679 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1680 if (!inode)
1681 return -ENOMEM;
1682
1683 inode->i_fop = &sel_class_ops;
1684 inode->i_ino = sel_class_to_ino(index);
1685 d_add(dentry, inode);
1686
1687 dentry = d_alloc_name(dir, "perms");
1688 if (!dentry)
1689 return -ENOMEM;
1690
1691 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1692 if (rc)
1693 return rc;
1694
1695 rc = sel_make_perm_files(classname, index, dentry);
1696
1697 return rc;
1698 }
1699
1700 static void sel_remove_classes(void)
1701 {
1702 struct list_head *class_node;
1703
1704 list_for_each(class_node, &class_dir->d_subdirs) {
1705 struct dentry *class_subdir = list_entry(class_node,
1706 struct dentry, d_u.d_child);
1707 struct list_head *class_subdir_node;
1708
1709 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1710 struct dentry *d = list_entry(class_subdir_node,
1711 struct dentry, d_u.d_child);
1712
1713 if (d->d_inode)
1714 if (d->d_inode->i_mode & S_IFDIR)
1715 sel_remove_entries(d);
1716 }
1717
1718 sel_remove_entries(class_subdir);
1719 }
1720
1721 sel_remove_entries(class_dir);
1722 }
1723
1724 static int sel_make_classes(void)
1725 {
1726 int rc, nclasses, i;
1727 char **classes;
1728
1729 /* delete any existing entries */
1730 sel_remove_classes();
1731
1732 rc = security_get_classes(&classes, &nclasses);
1733 if (rc)
1734 return rc;
1735
1736 /* +2 since classes are 1-indexed */
1737 last_class_ino = sel_class_to_ino(nclasses + 2);
1738
1739 for (i = 0; i < nclasses; i++) {
1740 struct dentry *class_name_dir;
1741
1742 rc = -ENOMEM;
1743 class_name_dir = d_alloc_name(class_dir, classes[i]);
1744 if (!class_name_dir)
1745 goto out;
1746
1747 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1748 &last_class_ino);
1749 if (rc)
1750 goto out;
1751
1752 /* i+1 since class values are 1-indexed */
1753 rc = sel_make_class_dir_entries(classes[i], i + 1,
1754 class_name_dir);
1755 if (rc)
1756 goto out;
1757 }
1758 rc = 0;
1759 out:
1760 for (i = 0; i < nclasses; i++)
1761 kfree(classes[i]);
1762 kfree(classes);
1763 return rc;
1764 }
1765
1766 static int sel_make_policycap(void)
1767 {
1768 unsigned int iter;
1769 struct dentry *dentry = NULL;
1770 struct inode *inode = NULL;
1771
1772 sel_remove_entries(policycap_dir);
1773
1774 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1775 if (iter < ARRAY_SIZE(policycap_names))
1776 dentry = d_alloc_name(policycap_dir,
1777 policycap_names[iter]);
1778 else
1779 dentry = d_alloc_name(policycap_dir, "unknown");
1780
1781 if (dentry == NULL)
1782 return -ENOMEM;
1783
1784 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1785 if (inode == NULL)
1786 return -ENOMEM;
1787
1788 inode->i_fop = &sel_policycap_ops;
1789 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1790 d_add(dentry, inode);
1791 }
1792
1793 return 0;
1794 }
1795
1796 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1797 unsigned long *ino)
1798 {
1799 struct inode *inode;
1800
1801 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1802 if (!inode)
1803 return -ENOMEM;
1804
1805 inode->i_op = &simple_dir_inode_operations;
1806 inode->i_fop = &simple_dir_operations;
1807 inode->i_ino = ++(*ino);
1808 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1809 inc_nlink(inode);
1810 d_add(dentry, inode);
1811 /* bump link count on parent directory, too */
1812 inc_nlink(dir);
1813
1814 return 0;
1815 }
1816
1817 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1818 {
1819 int ret;
1820 struct dentry *dentry;
1821 struct inode *inode, *root_inode;
1822 struct inode_security_struct *isec;
1823
1824 static struct tree_descr selinux_files[] = {
1825 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1826 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1827 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1828 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1829 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1830 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1831 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1832 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1833 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1834 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1835 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1836 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1837 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1838 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1839 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1840 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1841 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1842 /* last one */ {""}
1843 };
1844 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1845 if (ret)
1846 goto err;
1847
1848 root_inode = sb->s_root->d_inode;
1849
1850 ret = -ENOMEM;
1851 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1852 if (!dentry)
1853 goto err;
1854
1855 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1856 if (ret)
1857 goto err;
1858
1859 bool_dir = dentry;
1860
1861 ret = -ENOMEM;
1862 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1863 if (!dentry)
1864 goto err;
1865
1866 ret = -ENOMEM;
1867 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1868 if (!inode)
1869 goto err;
1870
1871 inode->i_ino = ++sel_last_ino;
1872 isec = (struct inode_security_struct *)inode->i_security;
1873 isec->sid = SECINITSID_DEVNULL;
1874 isec->sclass = SECCLASS_CHR_FILE;
1875 isec->initialized = 1;
1876
1877 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1878 d_add(dentry, inode);
1879 selinux_null = dentry;
1880
1881 ret = -ENOMEM;
1882 dentry = d_alloc_name(sb->s_root, "avc");
1883 if (!dentry)
1884 goto err;
1885
1886 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1887 if (ret)
1888 goto err;
1889
1890 ret = sel_make_avc_files(dentry);
1891 if (ret)
1892 goto err;
1893
1894 ret = -ENOMEM;
1895 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1896 if (!dentry)
1897 goto err;
1898
1899 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1900 if (ret)
1901 goto err;
1902
1903 ret = sel_make_initcon_files(dentry);
1904 if (ret)
1905 goto err;
1906
1907 ret = -ENOMEM;
1908 dentry = d_alloc_name(sb->s_root, "class");
1909 if (!dentry)
1910 goto err;
1911
1912 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1913 if (ret)
1914 goto err;
1915
1916 class_dir = dentry;
1917
1918 ret = -ENOMEM;
1919 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1920 if (!dentry)
1921 goto err;
1922
1923 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1924 if (ret)
1925 goto err;
1926
1927 policycap_dir = dentry;
1928
1929 return 0;
1930 err:
1931 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1932 __func__);
1933 return ret;
1934 }
1935
1936 static struct dentry *sel_mount(struct file_system_type *fs_type,
1937 int flags, const char *dev_name, void *data)
1938 {
1939 return mount_single(fs_type, flags, data, sel_fill_super);
1940 }
1941
1942 static struct file_system_type sel_fs_type = {
1943 .name = "selinuxfs",
1944 .mount = sel_mount,
1945 .kill_sb = kill_litter_super,
1946 };
1947
1948 struct vfsmount *selinuxfs_mount;
1949 static struct kobject *selinuxfs_kobj;
1950
1951 static int __init init_sel_fs(void)
1952 {
1953 int err;
1954
1955 if (!selinux_enabled)
1956 return 0;
1957
1958 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1959 if (!selinuxfs_kobj)
1960 return -ENOMEM;
1961
1962 err = register_filesystem(&sel_fs_type);
1963 if (err) {
1964 kobject_put(selinuxfs_kobj);
1965 return err;
1966 }
1967
1968 selinuxfs_mount = kern_mount(&sel_fs_type);
1969 if (IS_ERR(selinuxfs_mount)) {
1970 printk(KERN_ERR "selinuxfs: could not mount!\n");
1971 err = PTR_ERR(selinuxfs_mount);
1972 selinuxfs_mount = NULL;
1973 }
1974
1975 return err;
1976 }
1977
1978 __initcall(init_sel_fs);
1979
1980 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1981 void exit_sel_fs(void)
1982 {
1983 kobject_put(selinuxfs_kobj);
1984 kern_unmount(selinuxfs_mount);
1985 unregister_filesystem(&sel_fs_type);
1986 }
1987 #endif