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lsm: fix smack_inode_removexattr and xattr_getsecurity memleak
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blob00eed842c491c3585b68e7b23e2ee63885f02196
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 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
45
46 static int __init checkreqprot_setup(char *str)
47 {
48 unsigned long checkreqprot;
49 if (!kstrtoul(str, 0, &checkreqprot))
50 selinux_checkreqprot = checkreqprot ? 1 : 0;
51 return 1;
52 }
53 __setup("checkreqprot=", checkreqprot_setup);
54
55 static DEFINE_MUTEX(sel_mutex);
56
57 /* global data for booleans */
58 static struct dentry *bool_dir;
59 static int bool_num;
60 static char **bool_pending_names;
61 static int *bool_pending_values;
62
63 /* global data for classes */
64 static struct dentry *class_dir;
65 static unsigned long last_class_ino;
66
67 static char policy_opened;
68
69 /* global data for policy capabilities */
70 static struct dentry *policycap_dir;
71
72 enum sel_inos {
73 SEL_ROOT_INO = 2,
74 SEL_LOAD, /* load policy */
75 SEL_ENFORCE, /* get or set enforcing status */
76 SEL_CONTEXT, /* validate context */
77 SEL_ACCESS, /* compute access decision */
78 SEL_CREATE, /* compute create labeling decision */
79 SEL_RELABEL, /* compute relabeling decision */
80 SEL_USER, /* compute reachable user contexts */
81 SEL_POLICYVERS, /* return policy version for this kernel */
82 SEL_COMMIT_BOOLS, /* commit new boolean values */
83 SEL_MLS, /* return if MLS policy is enabled */
84 SEL_DISABLE, /* disable SELinux until next reboot */
85 SEL_MEMBER, /* compute polyinstantiation membership decision */
86 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
87 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
88 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
89 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
90 SEL_STATUS, /* export current status using mmap() */
91 SEL_POLICY, /* allow userspace to read the in kernel policy */
92 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
93 SEL_INO_NEXT, /* The next inode number to use */
94 };
95
96 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
97
98 #define SEL_INITCON_INO_OFFSET 0x01000000
99 #define SEL_BOOL_INO_OFFSET 0x02000000
100 #define SEL_CLASS_INO_OFFSET 0x04000000
101 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
102 #define SEL_INO_MASK 0x00ffffff
103
104 #define TMPBUFLEN 12
105 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
106 size_t count, loff_t *ppos)
107 {
108 char tmpbuf[TMPBUFLEN];
109 ssize_t length;
110
111 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
112 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
113 }
114
115 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
116 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
117 size_t count, loff_t *ppos)
118
119 {
120 char *page = NULL;
121 ssize_t length;
122 int new_value;
123
124 if (count >= PAGE_SIZE)
125 return -ENOMEM;
126
127 /* No partial writes. */
128 if (*ppos != 0)
129 return -EINVAL;
130
131 page = memdup_user_nul(buf, count);
132 if (IS_ERR(page))
133 return PTR_ERR(page);
134
135 length = -EINVAL;
136 if (sscanf(page, "%d", &new_value) != 1)
137 goto out;
138
139 new_value = !!new_value;
140
141 if (new_value != selinux_enforcing) {
142 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
143 SECCLASS_SECURITY, SECURITY__SETENFORCE,
144 NULL);
145 if (length)
146 goto out;
147 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
148 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
149 new_value, selinux_enforcing,
150 from_kuid(&init_user_ns, audit_get_loginuid(current)),
151 audit_get_sessionid(current));
152 selinux_enforcing = new_value;
153 if (selinux_enforcing)
154 avc_ss_reset(0);
155 selnl_notify_setenforce(selinux_enforcing);
156 selinux_status_update_setenforce(selinux_enforcing);
157 if (!selinux_enforcing)
158 call_lsm_notifier(LSM_POLICY_CHANGE, NULL);
159 }
160 length = count;
161 out:
162 kfree(page);
163 return length;
164 }
165 #else
166 #define sel_write_enforce NULL
167 #endif
168
169 static const struct file_operations sel_enforce_ops = {
170 .read = sel_read_enforce,
171 .write = sel_write_enforce,
172 .llseek = generic_file_llseek,
173 };
174
175 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
176 size_t count, loff_t *ppos)
177 {
178 char tmpbuf[TMPBUFLEN];
179 ssize_t length;
180 ino_t ino = file_inode(filp)->i_ino;
181 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
182 security_get_reject_unknown() : !security_get_allow_unknown();
183
184 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
185 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
186 }
187
188 static const struct file_operations sel_handle_unknown_ops = {
189 .read = sel_read_handle_unknown,
190 .llseek = generic_file_llseek,
191 };
192
193 static int sel_open_handle_status(struct inode *inode, struct file *filp)
194 {
195 struct page *status = selinux_kernel_status_page();
196
197 if (!status)
198 return -ENOMEM;
199
200 filp->private_data = status;
201
202 return 0;
203 }
204
205 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
206 size_t count, loff_t *ppos)
207 {
208 struct page *status = filp->private_data;
209
210 BUG_ON(!status);
211
212 return simple_read_from_buffer(buf, count, ppos,
213 page_address(status),
214 sizeof(struct selinux_kernel_status));
215 }
216
217 static int sel_mmap_handle_status(struct file *filp,
218 struct vm_area_struct *vma)
219 {
220 struct page *status = filp->private_data;
221 unsigned long size = vma->vm_end - vma->vm_start;
222
223 BUG_ON(!status);
224
225 /* only allows one page from the head */
226 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
227 return -EIO;
228 /* disallow writable mapping */
229 if (vma->vm_flags & VM_WRITE)
230 return -EPERM;
231 /* disallow mprotect() turns it into writable */
232 vma->vm_flags &= ~VM_MAYWRITE;
233
234 return remap_pfn_range(vma, vma->vm_start,
235 page_to_pfn(status),
236 size, vma->vm_page_prot);
237 }
238
239 static const struct file_operations sel_handle_status_ops = {
240 .open = sel_open_handle_status,
241 .read = sel_read_handle_status,
242 .mmap = sel_mmap_handle_status,
243 .llseek = generic_file_llseek,
244 };
245
246 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
247 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
248 size_t count, loff_t *ppos)
249
250 {
251 char *page;
252 ssize_t length;
253 int new_value;
254
255 if (count >= PAGE_SIZE)
256 return -ENOMEM;
257
258 /* No partial writes. */
259 if (*ppos != 0)
260 return -EINVAL;
261
262 page = memdup_user_nul(buf, count);
263 if (IS_ERR(page))
264 return PTR_ERR(page);
265
266 length = -EINVAL;
267 if (sscanf(page, "%d", &new_value) != 1)
268 goto out;
269
270 if (new_value) {
271 length = selinux_disable();
272 if (length)
273 goto out;
274 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
275 "selinux=0 auid=%u ses=%u",
276 from_kuid(&init_user_ns, audit_get_loginuid(current)),
277 audit_get_sessionid(current));
278 }
279
280 length = count;
281 out:
282 kfree(page);
283 return length;
284 }
285 #else
286 #define sel_write_disable NULL
287 #endif
288
289 static const struct file_operations sel_disable_ops = {
290 .write = sel_write_disable,
291 .llseek = generic_file_llseek,
292 };
293
294 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
295 size_t count, loff_t *ppos)
296 {
297 char tmpbuf[TMPBUFLEN];
298 ssize_t length;
299
300 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
301 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
302 }
303
304 static const struct file_operations sel_policyvers_ops = {
305 .read = sel_read_policyvers,
306 .llseek = generic_file_llseek,
307 };
308
309 /* declaration for sel_write_load */
310 static int sel_make_bools(void);
311 static int sel_make_classes(void);
312 static int sel_make_policycap(void);
313
314 /* declaration for sel_make_class_dirs */
315 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
316 unsigned long *ino);
317
318 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
319 size_t count, loff_t *ppos)
320 {
321 char tmpbuf[TMPBUFLEN];
322 ssize_t length;
323
324 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
325 security_mls_enabled());
326 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
327 }
328
329 static const struct file_operations sel_mls_ops = {
330 .read = sel_read_mls,
331 .llseek = generic_file_llseek,
332 };
333
334 struct policy_load_memory {
335 size_t len;
336 void *data;
337 };
338
339 static int sel_open_policy(struct inode *inode, struct file *filp)
340 {
341 struct policy_load_memory *plm = NULL;
342 int rc;
343
344 BUG_ON(filp->private_data);
345
346 mutex_lock(&sel_mutex);
347
348 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
349 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
350 if (rc)
351 goto err;
352
353 rc = -EBUSY;
354 if (policy_opened)
355 goto err;
356
357 rc = -ENOMEM;
358 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
359 if (!plm)
360 goto err;
361
362 if (i_size_read(inode) != security_policydb_len()) {
363 inode_lock(inode);
364 i_size_write(inode, security_policydb_len());
365 inode_unlock(inode);
366 }
367
368 rc = security_read_policy(&plm->data, &plm->len);
369 if (rc)
370 goto err;
371
372 policy_opened = 1;
373
374 filp->private_data = plm;
375
376 mutex_unlock(&sel_mutex);
377
378 return 0;
379 err:
380 mutex_unlock(&sel_mutex);
381
382 if (plm)
383 vfree(plm->data);
384 kfree(plm);
385 return rc;
386 }
387
388 static int sel_release_policy(struct inode *inode, struct file *filp)
389 {
390 struct policy_load_memory *plm = filp->private_data;
391
392 BUG_ON(!plm);
393
394 policy_opened = 0;
395
396 vfree(plm->data);
397 kfree(plm);
398
399 return 0;
400 }
401
402 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
403 size_t count, loff_t *ppos)
404 {
405 struct policy_load_memory *plm = filp->private_data;
406 int ret;
407
408 mutex_lock(&sel_mutex);
409
410 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
411 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
412 if (ret)
413 goto out;
414
415 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
416 out:
417 mutex_unlock(&sel_mutex);
418 return ret;
419 }
420
421 static int sel_mmap_policy_fault(struct vm_fault *vmf)
422 {
423 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
424 unsigned long offset;
425 struct page *page;
426
427 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
428 return VM_FAULT_SIGBUS;
429
430 offset = vmf->pgoff << PAGE_SHIFT;
431 if (offset >= roundup(plm->len, PAGE_SIZE))
432 return VM_FAULT_SIGBUS;
433
434 page = vmalloc_to_page(plm->data + offset);
435 get_page(page);
436
437 vmf->page = page;
438
439 return 0;
440 }
441
442 static const struct vm_operations_struct sel_mmap_policy_ops = {
443 .fault = sel_mmap_policy_fault,
444 .page_mkwrite = sel_mmap_policy_fault,
445 };
446
447 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
448 {
449 if (vma->vm_flags & VM_SHARED) {
450 /* do not allow mprotect to make mapping writable */
451 vma->vm_flags &= ~VM_MAYWRITE;
452
453 if (vma->vm_flags & VM_WRITE)
454 return -EACCES;
455 }
456
457 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
458 vma->vm_ops = &sel_mmap_policy_ops;
459
460 return 0;
461 }
462
463 static const struct file_operations sel_policy_ops = {
464 .open = sel_open_policy,
465 .read = sel_read_policy,
466 .mmap = sel_mmap_policy,
467 .release = sel_release_policy,
468 .llseek = generic_file_llseek,
469 };
470
471 static ssize_t sel_write_load(struct file *file, const char __user *buf,
472 size_t count, loff_t *ppos)
473
474 {
475 ssize_t length;
476 void *data = NULL;
477
478 mutex_lock(&sel_mutex);
479
480 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
481 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
482 if (length)
483 goto out;
484
485 /* No partial writes. */
486 length = -EINVAL;
487 if (*ppos != 0)
488 goto out;
489
490 length = -EFBIG;
491 if (count > 64 * 1024 * 1024)
492 goto out;
493
494 length = -ENOMEM;
495 data = vmalloc(count);
496 if (!data)
497 goto out;
498
499 length = -EFAULT;
500 if (copy_from_user(data, buf, count) != 0)
501 goto out;
502
503 length = security_load_policy(data, count);
504 if (length) {
505 pr_warn_ratelimited("SELinux: failed to load policy\n");
506 goto out;
507 }
508
509 length = sel_make_bools();
510 if (length) {
511 pr_err("SELinux: failed to load policy booleans\n");
512 goto out1;
513 }
514
515 length = sel_make_classes();
516 if (length) {
517 pr_err("SELinux: failed to load policy classes\n");
518 goto out1;
519 }
520
521 length = sel_make_policycap();
522 if (length) {
523 pr_err("SELinux: failed to load policy capabilities\n");
524 goto out1;
525 }
526
527 length = count;
528
529 out1:
530 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
531 "policy loaded auid=%u ses=%u",
532 from_kuid(&init_user_ns, audit_get_loginuid(current)),
533 audit_get_sessionid(current));
534 out:
535 mutex_unlock(&sel_mutex);
536 vfree(data);
537 return length;
538 }
539
540 static const struct file_operations sel_load_ops = {
541 .write = sel_write_load,
542 .llseek = generic_file_llseek,
543 };
544
545 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
546 {
547 char *canon = NULL;
548 u32 sid, len;
549 ssize_t length;
550
551 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
552 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
553 if (length)
554 goto out;
555
556 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
557 if (length)
558 goto out;
559
560 length = security_sid_to_context(sid, &canon, &len);
561 if (length)
562 goto out;
563
564 length = -ERANGE;
565 if (len > SIMPLE_TRANSACTION_LIMIT) {
566 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
567 "payload max\n", __func__, len);
568 goto out;
569 }
570
571 memcpy(buf, canon, len);
572 length = len;
573 out:
574 kfree(canon);
575 return length;
576 }
577
578 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
579 size_t count, loff_t *ppos)
580 {
581 char tmpbuf[TMPBUFLEN];
582 ssize_t length;
583
584 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
585 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
586 }
587
588 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
589 size_t count, loff_t *ppos)
590 {
591 char *page;
592 ssize_t length;
593 unsigned int new_value;
594
595 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
596 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
597 NULL);
598 if (length)
599 return length;
600
601 if (count >= PAGE_SIZE)
602 return -ENOMEM;
603
604 /* No partial writes. */
605 if (*ppos != 0)
606 return -EINVAL;
607
608 page = memdup_user_nul(buf, count);
609 if (IS_ERR(page))
610 return PTR_ERR(page);
611
612 length = -EINVAL;
613 if (sscanf(page, "%u", &new_value) != 1)
614 goto out;
615
616 selinux_checkreqprot = new_value ? 1 : 0;
617 length = count;
618 out:
619 kfree(page);
620 return length;
621 }
622 static const struct file_operations sel_checkreqprot_ops = {
623 .read = sel_read_checkreqprot,
624 .write = sel_write_checkreqprot,
625 .llseek = generic_file_llseek,
626 };
627
628 static ssize_t sel_write_validatetrans(struct file *file,
629 const char __user *buf,
630 size_t count, loff_t *ppos)
631 {
632 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
633 char *req = NULL;
634 u32 osid, nsid, tsid;
635 u16 tclass;
636 int rc;
637
638 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
639 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
640 if (rc)
641 goto out;
642
643 rc = -ENOMEM;
644 if (count >= PAGE_SIZE)
645 goto out;
646
647 /* No partial writes. */
648 rc = -EINVAL;
649 if (*ppos != 0)
650 goto out;
651
652 req = memdup_user_nul(buf, count);
653 if (IS_ERR(req)) {
654 rc = PTR_ERR(req);
655 req = NULL;
656 goto out;
657 }
658
659 rc = -ENOMEM;
660 oldcon = kzalloc(count + 1, GFP_KERNEL);
661 if (!oldcon)
662 goto out;
663
664 newcon = kzalloc(count + 1, GFP_KERNEL);
665 if (!newcon)
666 goto out;
667
668 taskcon = kzalloc(count + 1, GFP_KERNEL);
669 if (!taskcon)
670 goto out;
671
672 rc = -EINVAL;
673 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
674 goto out;
675
676 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
677 if (rc)
678 goto out;
679
680 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
681 if (rc)
682 goto out;
683
684 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
685 if (rc)
686 goto out;
687
688 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
689 if (!rc)
690 rc = count;
691 out:
692 kfree(req);
693 kfree(oldcon);
694 kfree(newcon);
695 kfree(taskcon);
696 return rc;
697 }
698
699 static const struct file_operations sel_transition_ops = {
700 .write = sel_write_validatetrans,
701 .llseek = generic_file_llseek,
702 };
703
704 /*
705 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
706 */
707 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
708 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
709 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
710 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
711 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
712
713 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
714 [SEL_ACCESS] = sel_write_access,
715 [SEL_CREATE] = sel_write_create,
716 [SEL_RELABEL] = sel_write_relabel,
717 [SEL_USER] = sel_write_user,
718 [SEL_MEMBER] = sel_write_member,
719 [SEL_CONTEXT] = sel_write_context,
720 };
721
722 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
723 {
724 ino_t ino = file_inode(file)->i_ino;
725 char *data;
726 ssize_t rv;
727
728 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
729 return -EINVAL;
730
731 data = simple_transaction_get(file, buf, size);
732 if (IS_ERR(data))
733 return PTR_ERR(data);
734
735 rv = write_op[ino](file, data, size);
736 if (rv > 0) {
737 simple_transaction_set(file, rv);
738 rv = size;
739 }
740 return rv;
741 }
742
743 static const struct file_operations transaction_ops = {
744 .write = selinux_transaction_write,
745 .read = simple_transaction_read,
746 .release = simple_transaction_release,
747 .llseek = generic_file_llseek,
748 };
749
750 /*
751 * payload - write methods
752 * If the method has a response, the response should be put in buf,
753 * and the length returned. Otherwise return 0 or and -error.
754 */
755
756 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
757 {
758 char *scon = NULL, *tcon = NULL;
759 u32 ssid, tsid;
760 u16 tclass;
761 struct av_decision avd;
762 ssize_t length;
763
764 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
765 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
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 = -EINVAL;
780 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
781 goto out;
782
783 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
784 if (length)
785 goto out;
786
787 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
788 if (length)
789 goto out;
790
791 security_compute_av_user(ssid, tsid, tclass, &avd);
792
793 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
794 "%x %x %x %x %u %x",
795 avd.allowed, 0xffffffff,
796 avd.auditallow, avd.auditdeny,
797 avd.seqno, avd.flags);
798 out:
799 kfree(tcon);
800 kfree(scon);
801 return length;
802 }
803
804 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
805 {
806 char *scon = NULL, *tcon = NULL;
807 char *namebuf = NULL, *objname = NULL;
808 u32 ssid, tsid, newsid;
809 u16 tclass;
810 ssize_t length;
811 char *newcon = NULL;
812 u32 len;
813 int nargs;
814
815 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
816 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
817 NULL);
818 if (length)
819 goto out;
820
821 length = -ENOMEM;
822 scon = kzalloc(size + 1, GFP_KERNEL);
823 if (!scon)
824 goto out;
825
826 length = -ENOMEM;
827 tcon = kzalloc(size + 1, GFP_KERNEL);
828 if (!tcon)
829 goto out;
830
831 length = -ENOMEM;
832 namebuf = kzalloc(size + 1, GFP_KERNEL);
833 if (!namebuf)
834 goto out;
835
836 length = -EINVAL;
837 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
838 if (nargs < 3 || nargs > 4)
839 goto out;
840 if (nargs == 4) {
841 /*
842 * If and when the name of new object to be queried contains
843 * either whitespace or multibyte characters, they shall be
844 * encoded based on the percentage-encoding rule.
845 * If not encoded, the sscanf logic picks up only left-half
846 * of the supplied name; splitted by a whitespace unexpectedly.
847 */
848 char *r, *w;
849 int c1, c2;
850
851 r = w = namebuf;
852 do {
853 c1 = *r++;
854 if (c1 == '+')
855 c1 = ' ';
856 else if (c1 == '%') {
857 c1 = hex_to_bin(*r++);
858 if (c1 < 0)
859 goto out;
860 c2 = hex_to_bin(*r++);
861 if (c2 < 0)
862 goto out;
863 c1 = (c1 << 4) | c2;
864 }
865 *w++ = c1;
866 } while (c1 != '\0');
867
868 objname = namebuf;
869 }
870
871 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
872 if (length)
873 goto out;
874
875 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
876 if (length)
877 goto out;
878
879 length = security_transition_sid_user(ssid, tsid, tclass,
880 objname, &newsid);
881 if (length)
882 goto out;
883
884 length = security_sid_to_context(newsid, &newcon, &len);
885 if (length)
886 goto out;
887
888 length = -ERANGE;
889 if (len > SIMPLE_TRANSACTION_LIMIT) {
890 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
891 "payload max\n", __func__, len);
892 goto out;
893 }
894
895 memcpy(buf, newcon, len);
896 length = len;
897 out:
898 kfree(newcon);
899 kfree(namebuf);
900 kfree(tcon);
901 kfree(scon);
902 return length;
903 }
904
905 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
906 {
907 char *scon = NULL, *tcon = NULL;
908 u32 ssid, tsid, newsid;
909 u16 tclass;
910 ssize_t length;
911 char *newcon = NULL;
912 u32 len;
913
914 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
915 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
916 NULL);
917 if (length)
918 goto out;
919
920 length = -ENOMEM;
921 scon = kzalloc(size + 1, GFP_KERNEL);
922 if (!scon)
923 goto out;
924
925 length = -ENOMEM;
926 tcon = kzalloc(size + 1, GFP_KERNEL);
927 if (!tcon)
928 goto out;
929
930 length = -EINVAL;
931 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
932 goto out;
933
934 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
935 if (length)
936 goto out;
937
938 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
939 if (length)
940 goto out;
941
942 length = security_change_sid(ssid, tsid, tclass, &newsid);
943 if (length)
944 goto out;
945
946 length = security_sid_to_context(newsid, &newcon, &len);
947 if (length)
948 goto out;
949
950 length = -ERANGE;
951 if (len > SIMPLE_TRANSACTION_LIMIT)
952 goto out;
953
954 memcpy(buf, newcon, len);
955 length = len;
956 out:
957 kfree(newcon);
958 kfree(tcon);
959 kfree(scon);
960 return length;
961 }
962
963 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
964 {
965 char *con = NULL, *user = NULL, *ptr;
966 u32 sid, *sids = NULL;
967 ssize_t length;
968 char *newcon;
969 int i, rc;
970 u32 len, nsids;
971
972 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
973 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
974 NULL);
975 if (length)
976 goto out;
977
978 length = -ENOMEM;
979 con = kzalloc(size + 1, GFP_KERNEL);
980 if (!con)
981 goto out;
982
983 length = -ENOMEM;
984 user = kzalloc(size + 1, GFP_KERNEL);
985 if (!user)
986 goto out;
987
988 length = -EINVAL;
989 if (sscanf(buf, "%s %s", con, user) != 2)
990 goto out;
991
992 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
993 if (length)
994 goto out;
995
996 length = security_get_user_sids(sid, user, &sids, &nsids);
997 if (length)
998 goto out;
999
1000 length = sprintf(buf, "%u", nsids) + 1;
1001 ptr = buf + length;
1002 for (i = 0; i < nsids; i++) {
1003 rc = security_sid_to_context(sids[i], &newcon, &len);
1004 if (rc) {
1005 length = rc;
1006 goto out;
1007 }
1008 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1009 kfree(newcon);
1010 length = -ERANGE;
1011 goto out;
1012 }
1013 memcpy(ptr, newcon, len);
1014 kfree(newcon);
1015 ptr += len;
1016 length += len;
1017 }
1018 out:
1019 kfree(sids);
1020 kfree(user);
1021 kfree(con);
1022 return length;
1023 }
1024
1025 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1026 {
1027 char *scon = NULL, *tcon = NULL;
1028 u32 ssid, tsid, newsid;
1029 u16 tclass;
1030 ssize_t length;
1031 char *newcon = NULL;
1032 u32 len;
1033
1034 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1035 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1036 NULL);
1037 if (length)
1038 goto out;
1039
1040 length = -ENOMEM;
1041 scon = kzalloc(size + 1, GFP_KERNEL);
1042 if (!scon)
1043 goto out;
1044
1045 length = -ENOMEM;
1046 tcon = kzalloc(size + 1, GFP_KERNEL);
1047 if (!tcon)
1048 goto out;
1049
1050 length = -EINVAL;
1051 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1052 goto out;
1053
1054 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1055 if (length)
1056 goto out;
1057
1058 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1059 if (length)
1060 goto out;
1061
1062 length = security_member_sid(ssid, tsid, tclass, &newsid);
1063 if (length)
1064 goto out;
1065
1066 length = security_sid_to_context(newsid, &newcon, &len);
1067 if (length)
1068 goto out;
1069
1070 length = -ERANGE;
1071 if (len > SIMPLE_TRANSACTION_LIMIT) {
1072 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1073 "payload max\n", __func__, len);
1074 goto out;
1075 }
1076
1077 memcpy(buf, newcon, len);
1078 length = len;
1079 out:
1080 kfree(newcon);
1081 kfree(tcon);
1082 kfree(scon);
1083 return length;
1084 }
1085
1086 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1087 {
1088 struct inode *ret = new_inode(sb);
1089
1090 if (ret) {
1091 ret->i_mode = mode;
1092 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1093 }
1094 return ret;
1095 }
1096
1097 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1098 size_t count, loff_t *ppos)
1099 {
1100 char *page = NULL;
1101 ssize_t length;
1102 ssize_t ret;
1103 int cur_enforcing;
1104 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1105 const char *name = filep->f_path.dentry->d_name.name;
1106
1107 mutex_lock(&sel_mutex);
1108
1109 ret = -EINVAL;
1110 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1111 goto out;
1112
1113 ret = -ENOMEM;
1114 page = (char *)get_zeroed_page(GFP_KERNEL);
1115 if (!page)
1116 goto out;
1117
1118 cur_enforcing = security_get_bool_value(index);
1119 if (cur_enforcing < 0) {
1120 ret = cur_enforcing;
1121 goto out;
1122 }
1123 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1124 bool_pending_values[index]);
1125 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1126 out:
1127 mutex_unlock(&sel_mutex);
1128 free_page((unsigned long)page);
1129 return ret;
1130 }
1131
1132 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1133 size_t count, loff_t *ppos)
1134 {
1135 char *page = NULL;
1136 ssize_t length;
1137 int new_value;
1138 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1139 const char *name = filep->f_path.dentry->d_name.name;
1140
1141 mutex_lock(&sel_mutex);
1142
1143 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1144 SECCLASS_SECURITY, SECURITY__SETBOOL,
1145 NULL);
1146 if (length)
1147 goto out;
1148
1149 length = -EINVAL;
1150 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
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 page = memdup_user_nul(buf, count);
1163 if (IS_ERR(page)) {
1164 length = PTR_ERR(page);
1165 page = NULL;
1166 goto out;
1167 }
1168
1169 length = -EINVAL;
1170 if (sscanf(page, "%d", &new_value) != 1)
1171 goto out;
1172
1173 if (new_value)
1174 new_value = 1;
1175
1176 bool_pending_values[index] = new_value;
1177 length = count;
1178
1179 out:
1180 mutex_unlock(&sel_mutex);
1181 kfree(page);
1182 return length;
1183 }
1184
1185 static const struct file_operations sel_bool_ops = {
1186 .read = sel_read_bool,
1187 .write = sel_write_bool,
1188 .llseek = generic_file_llseek,
1189 };
1190
1191 static ssize_t sel_commit_bools_write(struct file *filep,
1192 const char __user *buf,
1193 size_t count, loff_t *ppos)
1194 {
1195 char *page = NULL;
1196 ssize_t length;
1197 int new_value;
1198
1199 mutex_lock(&sel_mutex);
1200
1201 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1202 SECCLASS_SECURITY, SECURITY__SETBOOL,
1203 NULL);
1204 if (length)
1205 goto out;
1206
1207 length = -ENOMEM;
1208 if (count >= PAGE_SIZE)
1209 goto out;
1210
1211 /* No partial writes. */
1212 length = -EINVAL;
1213 if (*ppos != 0)
1214 goto out;
1215
1216 page = memdup_user_nul(buf, count);
1217 if (IS_ERR(page)) {
1218 length = PTR_ERR(page);
1219 page = NULL;
1220 goto out;
1221 }
1222
1223 length = -EINVAL;
1224 if (sscanf(page, "%d", &new_value) != 1)
1225 goto out;
1226
1227 length = 0;
1228 if (new_value && bool_pending_values)
1229 length = security_set_bools(bool_num, bool_pending_values);
1230
1231 if (!length)
1232 length = count;
1233
1234 out:
1235 mutex_unlock(&sel_mutex);
1236 kfree(page);
1237 return length;
1238 }
1239
1240 static const struct file_operations sel_commit_bools_ops = {
1241 .write = sel_commit_bools_write,
1242 .llseek = generic_file_llseek,
1243 };
1244
1245 static void sel_remove_entries(struct dentry *de)
1246 {
1247 d_genocide(de);
1248 shrink_dcache_parent(de);
1249 }
1250
1251 #define BOOL_DIR_NAME "booleans"
1252
1253 static int sel_make_bools(void)
1254 {
1255 int i, ret;
1256 ssize_t len;
1257 struct dentry *dentry = NULL;
1258 struct dentry *dir = bool_dir;
1259 struct inode *inode = NULL;
1260 struct inode_security_struct *isec;
1261 char **names = NULL, *page;
1262 int num;
1263 int *values = NULL;
1264 u32 sid;
1265
1266 /* remove any existing files */
1267 for (i = 0; i < bool_num; i++)
1268 kfree(bool_pending_names[i]);
1269 kfree(bool_pending_names);
1270 kfree(bool_pending_values);
1271 bool_num = 0;
1272 bool_pending_names = NULL;
1273 bool_pending_values = NULL;
1274
1275 sel_remove_entries(dir);
1276
1277 ret = -ENOMEM;
1278 page = (char *)get_zeroed_page(GFP_KERNEL);
1279 if (!page)
1280 goto out;
1281
1282 ret = security_get_bools(&num, &names, &values);
1283 if (ret)
1284 goto out;
1285
1286 for (i = 0; i < num; i++) {
1287 ret = -ENOMEM;
1288 dentry = d_alloc_name(dir, names[i]);
1289 if (!dentry)
1290 goto out;
1291
1292 ret = -ENOMEM;
1293 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1294 if (!inode)
1295 goto out;
1296
1297 ret = -ENAMETOOLONG;
1298 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1299 if (len >= PAGE_SIZE)
1300 goto out;
1301
1302 isec = (struct inode_security_struct *)inode->i_security;
1303 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1304 if (ret) {
1305 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1306 page);
1307 sid = SECINITSID_SECURITY;
1308 }
1309
1310 isec->sid = sid;
1311 isec->initialized = LABEL_INITIALIZED;
1312 inode->i_fop = &sel_bool_ops;
1313 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1314 d_add(dentry, inode);
1315 }
1316 bool_num = num;
1317 bool_pending_names = names;
1318 bool_pending_values = values;
1319
1320 free_page((unsigned long)page);
1321 return 0;
1322 out:
1323 free_page((unsigned long)page);
1324
1325 if (names) {
1326 for (i = 0; i < num; i++)
1327 kfree(names[i]);
1328 kfree(names);
1329 }
1330 kfree(values);
1331 sel_remove_entries(dir);
1332
1333 return ret;
1334 }
1335
1336 #define NULL_FILE_NAME "null"
1337
1338 struct path selinux_null;
1339
1340 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1341 size_t count, loff_t *ppos)
1342 {
1343 char tmpbuf[TMPBUFLEN];
1344 ssize_t length;
1345
1346 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1347 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1348 }
1349
1350 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1351 const char __user *buf,
1352 size_t count, loff_t *ppos)
1353
1354 {
1355 char *page;
1356 ssize_t ret;
1357 unsigned int new_value;
1358
1359 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1360 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1361 NULL);
1362 if (ret)
1363 return ret;
1364
1365 if (count >= PAGE_SIZE)
1366 return -ENOMEM;
1367
1368 /* No partial writes. */
1369 if (*ppos != 0)
1370 return -EINVAL;
1371
1372 page = memdup_user_nul(buf, count);
1373 if (IS_ERR(page))
1374 return PTR_ERR(page);
1375
1376 ret = -EINVAL;
1377 if (sscanf(page, "%u", &new_value) != 1)
1378 goto out;
1379
1380 avc_cache_threshold = new_value;
1381
1382 ret = count;
1383 out:
1384 kfree(page);
1385 return ret;
1386 }
1387
1388 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1389 size_t count, loff_t *ppos)
1390 {
1391 char *page;
1392 ssize_t length;
1393
1394 page = (char *)__get_free_page(GFP_KERNEL);
1395 if (!page)
1396 return -ENOMEM;
1397
1398 length = avc_get_hash_stats(page);
1399 if (length >= 0)
1400 length = simple_read_from_buffer(buf, count, ppos, page, length);
1401 free_page((unsigned long)page);
1402
1403 return length;
1404 }
1405
1406 static const struct file_operations sel_avc_cache_threshold_ops = {
1407 .read = sel_read_avc_cache_threshold,
1408 .write = sel_write_avc_cache_threshold,
1409 .llseek = generic_file_llseek,
1410 };
1411
1412 static const struct file_operations sel_avc_hash_stats_ops = {
1413 .read = sel_read_avc_hash_stats,
1414 .llseek = generic_file_llseek,
1415 };
1416
1417 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1418 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1419 {
1420 int cpu;
1421
1422 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1423 if (!cpu_possible(cpu))
1424 continue;
1425 *idx = cpu + 1;
1426 return &per_cpu(avc_cache_stats, cpu);
1427 }
1428 return NULL;
1429 }
1430
1431 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1432 {
1433 loff_t n = *pos - 1;
1434
1435 if (*pos == 0)
1436 return SEQ_START_TOKEN;
1437
1438 return sel_avc_get_stat_idx(&n);
1439 }
1440
1441 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1442 {
1443 return sel_avc_get_stat_idx(pos);
1444 }
1445
1446 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1447 {
1448 struct avc_cache_stats *st = v;
1449
1450 if (v == SEQ_START_TOKEN) {
1451 seq_puts(seq,
1452 "lookups hits misses allocations reclaims frees\n");
1453 } else {
1454 unsigned int lookups = st->lookups;
1455 unsigned int misses = st->misses;
1456 unsigned int hits = lookups - misses;
1457 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1458 hits, misses, st->allocations,
1459 st->reclaims, st->frees);
1460 }
1461 return 0;
1462 }
1463
1464 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1465 { }
1466
1467 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1468 .start = sel_avc_stats_seq_start,
1469 .next = sel_avc_stats_seq_next,
1470 .show = sel_avc_stats_seq_show,
1471 .stop = sel_avc_stats_seq_stop,
1472 };
1473
1474 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1475 {
1476 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1477 }
1478
1479 static const struct file_operations sel_avc_cache_stats_ops = {
1480 .open = sel_open_avc_cache_stats,
1481 .read = seq_read,
1482 .llseek = seq_lseek,
1483 .release = seq_release,
1484 };
1485 #endif
1486
1487 static int sel_make_avc_files(struct dentry *dir)
1488 {
1489 int i;
1490 static const struct tree_descr files[] = {
1491 { "cache_threshold",
1492 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1493 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1494 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1495 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1496 #endif
1497 };
1498
1499 for (i = 0; i < ARRAY_SIZE(files); i++) {
1500 struct inode *inode;
1501 struct dentry *dentry;
1502
1503 dentry = d_alloc_name(dir, files[i].name);
1504 if (!dentry)
1505 return -ENOMEM;
1506
1507 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1508 if (!inode)
1509 return -ENOMEM;
1510
1511 inode->i_fop = files[i].ops;
1512 inode->i_ino = ++sel_last_ino;
1513 d_add(dentry, inode);
1514 }
1515
1516 return 0;
1517 }
1518
1519 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1520 size_t count, loff_t *ppos)
1521 {
1522 char *con;
1523 u32 sid, len;
1524 ssize_t ret;
1525
1526 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1527 ret = security_sid_to_context(sid, &con, &len);
1528 if (ret)
1529 return ret;
1530
1531 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1532 kfree(con);
1533 return ret;
1534 }
1535
1536 static const struct file_operations sel_initcon_ops = {
1537 .read = sel_read_initcon,
1538 .llseek = generic_file_llseek,
1539 };
1540
1541 static int sel_make_initcon_files(struct dentry *dir)
1542 {
1543 int i;
1544
1545 for (i = 1; i <= SECINITSID_NUM; i++) {
1546 struct inode *inode;
1547 struct dentry *dentry;
1548 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1549 if (!dentry)
1550 return -ENOMEM;
1551
1552 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1553 if (!inode)
1554 return -ENOMEM;
1555
1556 inode->i_fop = &sel_initcon_ops;
1557 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1558 d_add(dentry, inode);
1559 }
1560
1561 return 0;
1562 }
1563
1564 static inline unsigned long sel_class_to_ino(u16 class)
1565 {
1566 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1567 }
1568
1569 static inline u16 sel_ino_to_class(unsigned long ino)
1570 {
1571 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1572 }
1573
1574 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1575 {
1576 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1577 }
1578
1579 static inline u32 sel_ino_to_perm(unsigned long ino)
1580 {
1581 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1582 }
1583
1584 static ssize_t sel_read_class(struct file *file, char __user *buf,
1585 size_t count, loff_t *ppos)
1586 {
1587 unsigned long ino = file_inode(file)->i_ino;
1588 char res[TMPBUFLEN];
1589 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1590 return simple_read_from_buffer(buf, count, ppos, res, len);
1591 }
1592
1593 static const struct file_operations sel_class_ops = {
1594 .read = sel_read_class,
1595 .llseek = generic_file_llseek,
1596 };
1597
1598 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1599 size_t count, loff_t *ppos)
1600 {
1601 unsigned long ino = file_inode(file)->i_ino;
1602 char res[TMPBUFLEN];
1603 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1604 return simple_read_from_buffer(buf, count, ppos, res, len);
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_inode(file)->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 = sel_make_dir(dir, "perms", &last_class_ino);
1688 if (IS_ERR(dentry))
1689 return PTR_ERR(dentry);
1690
1691 rc = sel_make_perm_files(classname, index, dentry);
1692
1693 return rc;
1694 }
1695
1696 static int sel_make_classes(void)
1697 {
1698 int rc, nclasses, i;
1699 char **classes;
1700
1701 /* delete any existing entries */
1702 sel_remove_entries(class_dir);
1703
1704 rc = security_get_classes(&classes, &nclasses);
1705 if (rc)
1706 return rc;
1707
1708 /* +2 since classes are 1-indexed */
1709 last_class_ino = sel_class_to_ino(nclasses + 2);
1710
1711 for (i = 0; i < nclasses; i++) {
1712 struct dentry *class_name_dir;
1713
1714 class_name_dir = sel_make_dir(class_dir, classes[i],
1715 &last_class_ino);
1716 if (IS_ERR(class_name_dir)) {
1717 rc = PTR_ERR(class_name_dir);
1718 goto out;
1719 }
1720
1721 /* i+1 since class values are 1-indexed */
1722 rc = sel_make_class_dir_entries(classes[i], i + 1,
1723 class_name_dir);
1724 if (rc)
1725 goto out;
1726 }
1727 rc = 0;
1728 out:
1729 for (i = 0; i < nclasses; i++)
1730 kfree(classes[i]);
1731 kfree(classes);
1732 return rc;
1733 }
1734
1735 static int sel_make_policycap(void)
1736 {
1737 unsigned int iter;
1738 struct dentry *dentry = NULL;
1739 struct inode *inode = NULL;
1740
1741 sel_remove_entries(policycap_dir);
1742
1743 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1744 if (iter < ARRAY_SIZE(selinux_policycap_names))
1745 dentry = d_alloc_name(policycap_dir,
1746 selinux_policycap_names[iter]);
1747 else
1748 dentry = d_alloc_name(policycap_dir, "unknown");
1749
1750 if (dentry == NULL)
1751 return -ENOMEM;
1752
1753 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1754 if (inode == NULL)
1755 return -ENOMEM;
1756
1757 inode->i_fop = &sel_policycap_ops;
1758 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1759 d_add(dentry, inode);
1760 }
1761
1762 return 0;
1763 }
1764
1765 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1766 unsigned long *ino)
1767 {
1768 struct dentry *dentry = d_alloc_name(dir, name);
1769 struct inode *inode;
1770
1771 if (!dentry)
1772 return ERR_PTR(-ENOMEM);
1773
1774 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1775 if (!inode) {
1776 dput(dentry);
1777 return ERR_PTR(-ENOMEM);
1778 }
1779
1780 inode->i_op = &simple_dir_inode_operations;
1781 inode->i_fop = &simple_dir_operations;
1782 inode->i_ino = ++(*ino);
1783 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1784 inc_nlink(inode);
1785 d_add(dentry, inode);
1786 /* bump link count on parent directory, too */
1787 inc_nlink(d_inode(dir));
1788
1789 return dentry;
1790 }
1791
1792 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1793 {
1794 int ret;
1795 struct dentry *dentry;
1796 struct inode *inode;
1797 struct inode_security_struct *isec;
1798
1799 static const struct tree_descr selinux_files[] = {
1800 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1801 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1802 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1804 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1806 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1807 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1808 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1809 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1810 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1811 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1812 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1813 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1814 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1815 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1816 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1817 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1818 S_IWUGO},
1819 /* last one */ {""}
1820 };
1821 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1822 if (ret)
1823 goto err;
1824
1825 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1826 if (IS_ERR(bool_dir)) {
1827 ret = PTR_ERR(bool_dir);
1828 bool_dir = NULL;
1829 goto err;
1830 }
1831
1832 ret = -ENOMEM;
1833 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1834 if (!dentry)
1835 goto err;
1836
1837 ret = -ENOMEM;
1838 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1839 if (!inode)
1840 goto err;
1841
1842 inode->i_ino = ++sel_last_ino;
1843 isec = (struct inode_security_struct *)inode->i_security;
1844 isec->sid = SECINITSID_DEVNULL;
1845 isec->sclass = SECCLASS_CHR_FILE;
1846 isec->initialized = LABEL_INITIALIZED;
1847
1848 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1849 d_add(dentry, inode);
1850 selinux_null.dentry = dentry;
1851
1852 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1853 if (IS_ERR(dentry)) {
1854 ret = PTR_ERR(dentry);
1855 goto err;
1856 }
1857
1858 ret = sel_make_avc_files(dentry);
1859 if (ret)
1860 goto err;
1861
1862 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1863 if (IS_ERR(dentry)) {
1864 ret = PTR_ERR(dentry);
1865 goto err;
1866 }
1867
1868 ret = sel_make_initcon_files(dentry);
1869 if (ret)
1870 goto err;
1871
1872 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1873 if (IS_ERR(class_dir)) {
1874 ret = PTR_ERR(class_dir);
1875 class_dir = NULL;
1876 goto err;
1877 }
1878
1879 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1880 if (IS_ERR(policycap_dir)) {
1881 ret = PTR_ERR(policycap_dir);
1882 policycap_dir = NULL;
1883 goto err;
1884 }
1885 return 0;
1886 err:
1887 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1888 __func__);
1889 return ret;
1890 }
1891
1892 static struct dentry *sel_mount(struct file_system_type *fs_type,
1893 int flags, const char *dev_name, void *data)
1894 {
1895 return mount_single(fs_type, flags, data, sel_fill_super);
1896 }
1897
1898 static struct file_system_type sel_fs_type = {
1899 .name = "selinuxfs",
1900 .mount = sel_mount,
1901 .kill_sb = kill_litter_super,
1902 };
1903
1904 struct vfsmount *selinuxfs_mount;
1905
1906 static int __init init_sel_fs(void)
1907 {
1908 int err;
1909
1910 if (!selinux_enabled)
1911 return 0;
1912
1913 err = sysfs_create_mount_point(fs_kobj, "selinux");
1914 if (err)
1915 return err;
1916
1917 err = register_filesystem(&sel_fs_type);
1918 if (err) {
1919 sysfs_remove_mount_point(fs_kobj, "selinux");
1920 return err;
1921 }
1922
1923 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1924 if (IS_ERR(selinuxfs_mount)) {
1925 printk(KERN_ERR "selinuxfs: could not mount!\n");
1926 err = PTR_ERR(selinuxfs_mount);
1927 selinuxfs_mount = NULL;
1928 }
1929
1930 return err;
1931 }
1932
1933 __initcall(init_sel_fs);
1934
1935 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1936 void exit_sel_fs(void)
1937 {
1938 sysfs_remove_mount_point(fs_kobj, "selinux");
1939 kern_unmount(selinuxfs_mount);
1940 unregister_filesystem(&sel_fs_type);
1941 }
1942 #endif
Linux with added FPC-III support