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Merge branch 'x86/cpu' into x86/asm, to avoid conflict
[deliverable/linux.git] / security / selinux / selinuxfs.c
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 "redhat1",
49 "always_check_network"
50 };
51
52 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
53
54 static int __init checkreqprot_setup(char *str)
55 {
56 unsigned long checkreqprot;
57 if (!kstrtoul(str, 0, &checkreqprot))
58 selinux_checkreqprot = checkreqprot ? 1 : 0;
59 return 1;
60 }
61 __setup("checkreqprot=", checkreqprot_setup);
62
63 static DEFINE_MUTEX(sel_mutex);
64
65 /* global data for booleans */
66 static struct dentry *bool_dir;
67 static int bool_num;
68 static char **bool_pending_names;
69 static int *bool_pending_values;
70
71 /* global data for classes */
72 static struct dentry *class_dir;
73 static unsigned long last_class_ino;
74
75 static char policy_opened;
76
77 /* global data for policy capabilities */
78 static struct dentry *policycap_dir;
79
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct *tsk,
82 u32 perms)
83 {
84 const struct task_security_struct *tsec;
85 u32 sid = 0;
86
87 rcu_read_lock();
88 tsec = __task_cred(tsk)->security;
89 if (tsec)
90 sid = tsec->sid;
91 rcu_read_unlock();
92 if (!tsec)
93 return -EACCES;
94
95 return avc_has_perm(sid, SECINITSID_SECURITY,
96 SECCLASS_SECURITY, perms, NULL);
97 }
98
99 enum sel_inos {
100 SEL_ROOT_INO = 2,
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
117 SEL_STATUS, /* export current status using mmap() */
118 SEL_POLICY, /* allow userspace to read the in kernel policy */
119 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
120 SEL_INO_NEXT, /* The next inode number to use */
121 };
122
123 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
124
125 #define SEL_INITCON_INO_OFFSET 0x01000000
126 #define SEL_BOOL_INO_OFFSET 0x02000000
127 #define SEL_CLASS_INO_OFFSET 0x04000000
128 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
129 #define SEL_INO_MASK 0x00ffffff
130
131 #define TMPBUFLEN 12
132 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
133 size_t count, loff_t *ppos)
134 {
135 char tmpbuf[TMPBUFLEN];
136 ssize_t length;
137
138 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
139 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
140 }
141
142 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
143 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
144 size_t count, loff_t *ppos)
145
146 {
147 char *page = NULL;
148 ssize_t length;
149 int new_value;
150
151 if (count >= PAGE_SIZE)
152 return -ENOMEM;
153
154 /* No partial writes. */
155 if (*ppos != 0)
156 return -EINVAL;
157
158 page = memdup_user_nul(buf, count);
159 if (IS_ERR(page))
160 return PTR_ERR(page);
161
162 length = -EINVAL;
163 if (sscanf(page, "%d", &new_value) != 1)
164 goto out;
165
166 if (new_value != selinux_enforcing) {
167 length = task_has_security(current, SECURITY__SETENFORCE);
168 if (length)
169 goto out;
170 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
171 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
172 new_value, selinux_enforcing,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 selinux_enforcing = new_value;
176 if (selinux_enforcing)
177 avc_ss_reset(0);
178 selnl_notify_setenforce(selinux_enforcing);
179 selinux_status_update_setenforce(selinux_enforcing);
180 }
181 length = count;
182 out:
183 kfree(page);
184 return length;
185 }
186 #else
187 #define sel_write_enforce NULL
188 #endif
189
190 static const struct file_operations sel_enforce_ops = {
191 .read = sel_read_enforce,
192 .write = sel_write_enforce,
193 .llseek = generic_file_llseek,
194 };
195
196 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
197 size_t count, loff_t *ppos)
198 {
199 char tmpbuf[TMPBUFLEN];
200 ssize_t length;
201 ino_t ino = file_inode(filp)->i_ino;
202 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
203 security_get_reject_unknown() : !security_get_allow_unknown();
204
205 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
206 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
207 }
208
209 static const struct file_operations sel_handle_unknown_ops = {
210 .read = sel_read_handle_unknown,
211 .llseek = generic_file_llseek,
212 };
213
214 static int sel_open_handle_status(struct inode *inode, struct file *filp)
215 {
216 struct page *status = selinux_kernel_status_page();
217
218 if (!status)
219 return -ENOMEM;
220
221 filp->private_data = status;
222
223 return 0;
224 }
225
226 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
227 size_t count, loff_t *ppos)
228 {
229 struct page *status = filp->private_data;
230
231 BUG_ON(!status);
232
233 return simple_read_from_buffer(buf, count, ppos,
234 page_address(status),
235 sizeof(struct selinux_kernel_status));
236 }
237
238 static int sel_mmap_handle_status(struct file *filp,
239 struct vm_area_struct *vma)
240 {
241 struct page *status = filp->private_data;
242 unsigned long size = vma->vm_end - vma->vm_start;
243
244 BUG_ON(!status);
245
246 /* only allows one page from the head */
247 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
248 return -EIO;
249 /* disallow writable mapping */
250 if (vma->vm_flags & VM_WRITE)
251 return -EPERM;
252 /* disallow mprotect() turns it into writable */
253 vma->vm_flags &= ~VM_MAYWRITE;
254
255 return remap_pfn_range(vma, vma->vm_start,
256 page_to_pfn(status),
257 size, vma->vm_page_prot);
258 }
259
260 static const struct file_operations sel_handle_status_ops = {
261 .open = sel_open_handle_status,
262 .read = sel_read_handle_status,
263 .mmap = sel_mmap_handle_status,
264 .llseek = generic_file_llseek,
265 };
266
267 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
268 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
269 size_t count, loff_t *ppos)
270
271 {
272 char *page;
273 ssize_t length;
274 int new_value;
275
276 if (count >= PAGE_SIZE)
277 return -ENOMEM;
278
279 /* No partial writes. */
280 if (*ppos != 0)
281 return -EINVAL;
282
283 page = memdup_user_nul(buf, count);
284 if (IS_ERR(page))
285 return PTR_ERR(page);
286
287 length = -EINVAL;
288 if (sscanf(page, "%d", &new_value) != 1)
289 goto out;
290
291 if (new_value) {
292 length = selinux_disable();
293 if (length)
294 goto out;
295 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
296 "selinux=0 auid=%u ses=%u",
297 from_kuid(&init_user_ns, audit_get_loginuid(current)),
298 audit_get_sessionid(current));
299 }
300
301 length = count;
302 out:
303 kfree(page);
304 return length;
305 }
306 #else
307 #define sel_write_disable NULL
308 #endif
309
310 static const struct file_operations sel_disable_ops = {
311 .write = sel_write_disable,
312 .llseek = generic_file_llseek,
313 };
314
315 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
316 size_t count, loff_t *ppos)
317 {
318 char tmpbuf[TMPBUFLEN];
319 ssize_t length;
320
321 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
322 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
323 }
324
325 static const struct file_operations sel_policyvers_ops = {
326 .read = sel_read_policyvers,
327 .llseek = generic_file_llseek,
328 };
329
330 /* declaration for sel_write_load */
331 static int sel_make_bools(void);
332 static int sel_make_classes(void);
333 static int sel_make_policycap(void);
334
335 /* declaration for sel_make_class_dirs */
336 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
337 unsigned long *ino);
338
339 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
340 size_t count, loff_t *ppos)
341 {
342 char tmpbuf[TMPBUFLEN];
343 ssize_t length;
344
345 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
346 security_mls_enabled());
347 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
348 }
349
350 static const struct file_operations sel_mls_ops = {
351 .read = sel_read_mls,
352 .llseek = generic_file_llseek,
353 };
354
355 struct policy_load_memory {
356 size_t len;
357 void *data;
358 };
359
360 static int sel_open_policy(struct inode *inode, struct file *filp)
361 {
362 struct policy_load_memory *plm = NULL;
363 int rc;
364
365 BUG_ON(filp->private_data);
366
367 mutex_lock(&sel_mutex);
368
369 rc = task_has_security(current, SECURITY__READ_POLICY);
370 if (rc)
371 goto err;
372
373 rc = -EBUSY;
374 if (policy_opened)
375 goto err;
376
377 rc = -ENOMEM;
378 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
379 if (!plm)
380 goto err;
381
382 if (i_size_read(inode) != security_policydb_len()) {
383 inode_lock(inode);
384 i_size_write(inode, security_policydb_len());
385 inode_unlock(inode);
386 }
387
388 rc = security_read_policy(&plm->data, &plm->len);
389 if (rc)
390 goto err;
391
392 policy_opened = 1;
393
394 filp->private_data = plm;
395
396 mutex_unlock(&sel_mutex);
397
398 return 0;
399 err:
400 mutex_unlock(&sel_mutex);
401
402 if (plm)
403 vfree(plm->data);
404 kfree(plm);
405 return rc;
406 }
407
408 static int sel_release_policy(struct inode *inode, struct file *filp)
409 {
410 struct policy_load_memory *plm = filp->private_data;
411
412 BUG_ON(!plm);
413
414 policy_opened = 0;
415
416 vfree(plm->data);
417 kfree(plm);
418
419 return 0;
420 }
421
422 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
423 size_t count, loff_t *ppos)
424 {
425 struct policy_load_memory *plm = filp->private_data;
426 int ret;
427
428 mutex_lock(&sel_mutex);
429
430 ret = task_has_security(current, SECURITY__READ_POLICY);
431 if (ret)
432 goto out;
433
434 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
435 out:
436 mutex_unlock(&sel_mutex);
437 return ret;
438 }
439
440 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
441 struct vm_fault *vmf)
442 {
443 struct policy_load_memory *plm = vma->vm_file->private_data;
444 unsigned long offset;
445 struct page *page;
446
447 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
448 return VM_FAULT_SIGBUS;
449
450 offset = vmf->pgoff << PAGE_SHIFT;
451 if (offset >= roundup(plm->len, PAGE_SIZE))
452 return VM_FAULT_SIGBUS;
453
454 page = vmalloc_to_page(plm->data + offset);
455 get_page(page);
456
457 vmf->page = page;
458
459 return 0;
460 }
461
462 static const struct vm_operations_struct sel_mmap_policy_ops = {
463 .fault = sel_mmap_policy_fault,
464 .page_mkwrite = sel_mmap_policy_fault,
465 };
466
467 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
468 {
469 if (vma->vm_flags & VM_SHARED) {
470 /* do not allow mprotect to make mapping writable */
471 vma->vm_flags &= ~VM_MAYWRITE;
472
473 if (vma->vm_flags & VM_WRITE)
474 return -EACCES;
475 }
476
477 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
478 vma->vm_ops = &sel_mmap_policy_ops;
479
480 return 0;
481 }
482
483 static const struct file_operations sel_policy_ops = {
484 .open = sel_open_policy,
485 .read = sel_read_policy,
486 .mmap = sel_mmap_policy,
487 .release = sel_release_policy,
488 .llseek = generic_file_llseek,
489 };
490
491 static ssize_t sel_write_load(struct file *file, const char __user *buf,
492 size_t count, loff_t *ppos)
493
494 {
495 ssize_t length;
496 void *data = NULL;
497
498 mutex_lock(&sel_mutex);
499
500 length = task_has_security(current, SECURITY__LOAD_POLICY);
501 if (length)
502 goto out;
503
504 /* No partial writes. */
505 length = -EINVAL;
506 if (*ppos != 0)
507 goto out;
508
509 length = -EFBIG;
510 if (count > 64 * 1024 * 1024)
511 goto out;
512
513 length = -ENOMEM;
514 data = vmalloc(count);
515 if (!data)
516 goto out;
517
518 length = -EFAULT;
519 if (copy_from_user(data, buf, count) != 0)
520 goto out;
521
522 length = security_load_policy(data, count);
523 if (length)
524 goto out;
525
526 length = sel_make_bools();
527 if (length)
528 goto out1;
529
530 length = sel_make_classes();
531 if (length)
532 goto out1;
533
534 length = sel_make_policycap();
535 if (length)
536 goto out1;
537
538 length = count;
539
540 out1:
541 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
542 "policy loaded auid=%u ses=%u",
543 from_kuid(&init_user_ns, audit_get_loginuid(current)),
544 audit_get_sessionid(current));
545 out:
546 mutex_unlock(&sel_mutex);
547 vfree(data);
548 return length;
549 }
550
551 static const struct file_operations sel_load_ops = {
552 .write = sel_write_load,
553 .llseek = generic_file_llseek,
554 };
555
556 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
557 {
558 char *canon = NULL;
559 u32 sid, len;
560 ssize_t length;
561
562 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
563 if (length)
564 goto out;
565
566 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
567 if (length)
568 goto out;
569
570 length = security_sid_to_context(sid, &canon, &len);
571 if (length)
572 goto out;
573
574 length = -ERANGE;
575 if (len > SIMPLE_TRANSACTION_LIMIT) {
576 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
577 "payload max\n", __func__, len);
578 goto out;
579 }
580
581 memcpy(buf, canon, len);
582 length = len;
583 out:
584 kfree(canon);
585 return length;
586 }
587
588 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
589 size_t count, loff_t *ppos)
590 {
591 char tmpbuf[TMPBUFLEN];
592 ssize_t length;
593
594 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
595 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
596 }
597
598 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
599 size_t count, loff_t *ppos)
600 {
601 char *page;
602 ssize_t length;
603 unsigned int new_value;
604
605 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
606 if (length)
607 return length;
608
609 if (count >= PAGE_SIZE)
610 return -ENOMEM;
611
612 /* No partial writes. */
613 if (*ppos != 0)
614 return -EINVAL;
615
616 page = memdup_user_nul(buf, count);
617 if (IS_ERR(page))
618 return PTR_ERR(page);
619
620 length = -EINVAL;
621 if (sscanf(page, "%u", &new_value) != 1)
622 goto out;
623
624 selinux_checkreqprot = new_value ? 1 : 0;
625 length = count;
626 out:
627 kfree(page);
628 return length;
629 }
630 static const struct file_operations sel_checkreqprot_ops = {
631 .read = sel_read_checkreqprot,
632 .write = sel_write_checkreqprot,
633 .llseek = generic_file_llseek,
634 };
635
636 static ssize_t sel_write_validatetrans(struct file *file,
637 const char __user *buf,
638 size_t count, loff_t *ppos)
639 {
640 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
641 char *req = NULL;
642 u32 osid, nsid, tsid;
643 u16 tclass;
644 int rc;
645
646 rc = task_has_security(current, SECURITY__VALIDATE_TRANS);
647 if (rc)
648 goto out;
649
650 rc = -ENOMEM;
651 if (count >= PAGE_SIZE)
652 goto out;
653
654 /* No partial writes. */
655 rc = -EINVAL;
656 if (*ppos != 0)
657 goto out;
658
659 rc = -ENOMEM;
660 req = kzalloc(count + 1, GFP_KERNEL);
661 if (!req)
662 goto out;
663
664 rc = -EFAULT;
665 if (copy_from_user(req, buf, count))
666 goto out;
667
668 rc = -ENOMEM;
669 oldcon = kzalloc(count + 1, GFP_KERNEL);
670 if (!oldcon)
671 goto out;
672
673 newcon = kzalloc(count + 1, GFP_KERNEL);
674 if (!newcon)
675 goto out;
676
677 taskcon = kzalloc(count + 1, GFP_KERNEL);
678 if (!taskcon)
679 goto out;
680
681 rc = -EINVAL;
682 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
683 goto out;
684
685 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
686 if (rc)
687 goto out;
688
689 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
690 if (rc)
691 goto out;
692
693 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
694 if (rc)
695 goto out;
696
697 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
698 if (!rc)
699 rc = count;
700 out:
701 kfree(req);
702 kfree(oldcon);
703 kfree(newcon);
704 kfree(taskcon);
705 return rc;
706 }
707
708 static const struct file_operations sel_transition_ops = {
709 .write = sel_write_validatetrans,
710 .llseek = generic_file_llseek,
711 };
712
713 /*
714 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
715 */
716 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
717 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
718 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
719 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
720 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
721
722 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
723 [SEL_ACCESS] = sel_write_access,
724 [SEL_CREATE] = sel_write_create,
725 [SEL_RELABEL] = sel_write_relabel,
726 [SEL_USER] = sel_write_user,
727 [SEL_MEMBER] = sel_write_member,
728 [SEL_CONTEXT] = sel_write_context,
729 };
730
731 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
732 {
733 ino_t ino = file_inode(file)->i_ino;
734 char *data;
735 ssize_t rv;
736
737 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
738 return -EINVAL;
739
740 data = simple_transaction_get(file, buf, size);
741 if (IS_ERR(data))
742 return PTR_ERR(data);
743
744 rv = write_op[ino](file, data, size);
745 if (rv > 0) {
746 simple_transaction_set(file, rv);
747 rv = size;
748 }
749 return rv;
750 }
751
752 static const struct file_operations transaction_ops = {
753 .write = selinux_transaction_write,
754 .read = simple_transaction_read,
755 .release = simple_transaction_release,
756 .llseek = generic_file_llseek,
757 };
758
759 /*
760 * payload - write methods
761 * If the method has a response, the response should be put in buf,
762 * and the length returned. Otherwise return 0 or and -error.
763 */
764
765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
766 {
767 char *scon = NULL, *tcon = NULL;
768 u32 ssid, tsid;
769 u16 tclass;
770 struct av_decision avd;
771 ssize_t length;
772
773 length = task_has_security(current, SECURITY__COMPUTE_AV);
774 if (length)
775 goto out;
776
777 length = -ENOMEM;
778 scon = kzalloc(size + 1, GFP_KERNEL);
779 if (!scon)
780 goto out;
781
782 length = -ENOMEM;
783 tcon = kzalloc(size + 1, GFP_KERNEL);
784 if (!tcon)
785 goto out;
786
787 length = -EINVAL;
788 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
789 goto out;
790
791 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
792 if (length)
793 goto out;
794
795 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
796 if (length)
797 goto out;
798
799 security_compute_av_user(ssid, tsid, tclass, &avd);
800
801 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
802 "%x %x %x %x %u %x",
803 avd.allowed, 0xffffffff,
804 avd.auditallow, avd.auditdeny,
805 avd.seqno, avd.flags);
806 out:
807 kfree(tcon);
808 kfree(scon);
809 return length;
810 }
811
812 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
813 {
814 char *scon = NULL, *tcon = NULL;
815 char *namebuf = NULL, *objname = NULL;
816 u32 ssid, tsid, newsid;
817 u16 tclass;
818 ssize_t length;
819 char *newcon = NULL;
820 u32 len;
821 int nargs;
822
823 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
824 if (length)
825 goto out;
826
827 length = -ENOMEM;
828 scon = kzalloc(size + 1, GFP_KERNEL);
829 if (!scon)
830 goto out;
831
832 length = -ENOMEM;
833 tcon = kzalloc(size + 1, GFP_KERNEL);
834 if (!tcon)
835 goto out;
836
837 length = -ENOMEM;
838 namebuf = kzalloc(size + 1, GFP_KERNEL);
839 if (!namebuf)
840 goto out;
841
842 length = -EINVAL;
843 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
844 if (nargs < 3 || nargs > 4)
845 goto out;
846 if (nargs == 4) {
847 /*
848 * If and when the name of new object to be queried contains
849 * either whitespace or multibyte characters, they shall be
850 * encoded based on the percentage-encoding rule.
851 * If not encoded, the sscanf logic picks up only left-half
852 * of the supplied name; splitted by a whitespace unexpectedly.
853 */
854 char *r, *w;
855 int c1, c2;
856
857 r = w = namebuf;
858 do {
859 c1 = *r++;
860 if (c1 == '+')
861 c1 = ' ';
862 else if (c1 == '%') {
863 c1 = hex_to_bin(*r++);
864 if (c1 < 0)
865 goto out;
866 c2 = hex_to_bin(*r++);
867 if (c2 < 0)
868 goto out;
869 c1 = (c1 << 4) | c2;
870 }
871 *w++ = c1;
872 } while (c1 != '\0');
873
874 objname = namebuf;
875 }
876
877 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
878 if (length)
879 goto out;
880
881 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
882 if (length)
883 goto out;
884
885 length = security_transition_sid_user(ssid, tsid, tclass,
886 objname, &newsid);
887 if (length)
888 goto out;
889
890 length = security_sid_to_context(newsid, &newcon, &len);
891 if (length)
892 goto out;
893
894 length = -ERANGE;
895 if (len > SIMPLE_TRANSACTION_LIMIT) {
896 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
897 "payload max\n", __func__, len);
898 goto out;
899 }
900
901 memcpy(buf, newcon, len);
902 length = len;
903 out:
904 kfree(newcon);
905 kfree(namebuf);
906 kfree(tcon);
907 kfree(scon);
908 return length;
909 }
910
911 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
912 {
913 char *scon = NULL, *tcon = NULL;
914 u32 ssid, tsid, newsid;
915 u16 tclass;
916 ssize_t length;
917 char *newcon = NULL;
918 u32 len;
919
920 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
921 if (length)
922 goto out;
923
924 length = -ENOMEM;
925 scon = kzalloc(size + 1, GFP_KERNEL);
926 if (!scon)
927 goto out;
928
929 length = -ENOMEM;
930 tcon = kzalloc(size + 1, GFP_KERNEL);
931 if (!tcon)
932 goto out;
933
934 length = -EINVAL;
935 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
936 goto out;
937
938 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
939 if (length)
940 goto out;
941
942 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
943 if (length)
944 goto out;
945
946 length = security_change_sid(ssid, tsid, tclass, &newsid);
947 if (length)
948 goto out;
949
950 length = security_sid_to_context(newsid, &newcon, &len);
951 if (length)
952 goto out;
953
954 length = -ERANGE;
955 if (len > SIMPLE_TRANSACTION_LIMIT)
956 goto out;
957
958 memcpy(buf, newcon, len);
959 length = len;
960 out:
961 kfree(newcon);
962 kfree(tcon);
963 kfree(scon);
964 return length;
965 }
966
967 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
968 {
969 char *con = NULL, *user = NULL, *ptr;
970 u32 sid, *sids = NULL;
971 ssize_t length;
972 char *newcon;
973 int i, rc;
974 u32 len, nsids;
975
976 length = task_has_security(current, SECURITY__COMPUTE_USER);
977 if (length)
978 goto out;
979
980 length = -ENOMEM;
981 con = kzalloc(size + 1, GFP_KERNEL);
982 if (!con)
983 goto out;
984
985 length = -ENOMEM;
986 user = kzalloc(size + 1, GFP_KERNEL);
987 if (!user)
988 goto out;
989
990 length = -EINVAL;
991 if (sscanf(buf, "%s %s", con, user) != 2)
992 goto out;
993
994 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
995 if (length)
996 goto out;
997
998 length = security_get_user_sids(sid, user, &sids, &nsids);
999 if (length)
1000 goto out;
1001
1002 length = sprintf(buf, "%u", nsids) + 1;
1003 ptr = buf + length;
1004 for (i = 0; i < nsids; i++) {
1005 rc = security_sid_to_context(sids[i], &newcon, &len);
1006 if (rc) {
1007 length = rc;
1008 goto out;
1009 }
1010 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1011 kfree(newcon);
1012 length = -ERANGE;
1013 goto out;
1014 }
1015 memcpy(ptr, newcon, len);
1016 kfree(newcon);
1017 ptr += len;
1018 length += len;
1019 }
1020 out:
1021 kfree(sids);
1022 kfree(user);
1023 kfree(con);
1024 return length;
1025 }
1026
1027 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1028 {
1029 char *scon = NULL, *tcon = NULL;
1030 u32 ssid, tsid, newsid;
1031 u16 tclass;
1032 ssize_t length;
1033 char *newcon = NULL;
1034 u32 len;
1035
1036 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
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;
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 = task_has_security(current, SECURITY__SETBOOL);
1144 if (length)
1145 goto out;
1146
1147 length = -EINVAL;
1148 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1149 goto out;
1150
1151 length = -ENOMEM;
1152 if (count >= PAGE_SIZE)
1153 goto out;
1154
1155 /* No partial writes. */
1156 length = -EINVAL;
1157 if (*ppos != 0)
1158 goto out;
1159
1160 page = memdup_user_nul(buf, count);
1161 if (IS_ERR(page)) {
1162 length = PTR_ERR(page);
1163 page = NULL;
1164 goto out;
1165 }
1166
1167 length = -EINVAL;
1168 if (sscanf(page, "%d", &new_value) != 1)
1169 goto out;
1170
1171 if (new_value)
1172 new_value = 1;
1173
1174 bool_pending_values[index] = new_value;
1175 length = count;
1176
1177 out:
1178 mutex_unlock(&sel_mutex);
1179 kfree(page);
1180 return length;
1181 }
1182
1183 static const struct file_operations sel_bool_ops = {
1184 .read = sel_read_bool,
1185 .write = sel_write_bool,
1186 .llseek = generic_file_llseek,
1187 };
1188
1189 static ssize_t sel_commit_bools_write(struct file *filep,
1190 const char __user *buf,
1191 size_t count, loff_t *ppos)
1192 {
1193 char *page = NULL;
1194 ssize_t length;
1195 int new_value;
1196
1197 mutex_lock(&sel_mutex);
1198
1199 length = task_has_security(current, SECURITY__SETBOOL);
1200 if (length)
1201 goto out;
1202
1203 length = -ENOMEM;
1204 if (count >= PAGE_SIZE)
1205 goto out;
1206
1207 /* No partial writes. */
1208 length = -EINVAL;
1209 if (*ppos != 0)
1210 goto out;
1211
1212 page = memdup_user_nul(buf, count);
1213 if (IS_ERR(page)) {
1214 length = PTR_ERR(page);
1215 page = NULL;
1216 goto out;
1217 }
1218
1219 length = -EINVAL;
1220 if (sscanf(page, "%d", &new_value) != 1)
1221 goto out;
1222
1223 length = 0;
1224 if (new_value && bool_pending_values)
1225 length = security_set_bools(bool_num, bool_pending_values);
1226
1227 if (!length)
1228 length = count;
1229
1230 out:
1231 mutex_unlock(&sel_mutex);
1232 kfree(page);
1233 return length;
1234 }
1235
1236 static const struct file_operations sel_commit_bools_ops = {
1237 .write = sel_commit_bools_write,
1238 .llseek = generic_file_llseek,
1239 };
1240
1241 static void sel_remove_entries(struct dentry *de)
1242 {
1243 d_genocide(de);
1244 shrink_dcache_parent(de);
1245 }
1246
1247 #define BOOL_DIR_NAME "booleans"
1248
1249 static int sel_make_bools(void)
1250 {
1251 int i, ret;
1252 ssize_t len;
1253 struct dentry *dentry = NULL;
1254 struct dentry *dir = bool_dir;
1255 struct inode *inode = NULL;
1256 struct inode_security_struct *isec;
1257 char **names = NULL, *page;
1258 int num;
1259 int *values = NULL;
1260 u32 sid;
1261
1262 /* remove any existing files */
1263 for (i = 0; i < bool_num; i++)
1264 kfree(bool_pending_names[i]);
1265 kfree(bool_pending_names);
1266 kfree(bool_pending_values);
1267 bool_num = 0;
1268 bool_pending_names = NULL;
1269 bool_pending_values = NULL;
1270
1271 sel_remove_entries(dir);
1272
1273 ret = -ENOMEM;
1274 page = (char *)get_zeroed_page(GFP_KERNEL);
1275 if (!page)
1276 goto out;
1277
1278 ret = security_get_bools(&num, &names, &values);
1279 if (ret)
1280 goto out;
1281
1282 for (i = 0; i < num; i++) {
1283 ret = -ENOMEM;
1284 dentry = d_alloc_name(dir, names[i]);
1285 if (!dentry)
1286 goto out;
1287
1288 ret = -ENOMEM;
1289 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1290 if (!inode)
1291 goto out;
1292
1293 ret = -ENAMETOOLONG;
1294 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1295 if (len >= PAGE_SIZE)
1296 goto out;
1297
1298 isec = (struct inode_security_struct *)inode->i_security;
1299 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1300 if (ret)
1301 goto out;
1302
1303 isec->sid = sid;
1304 isec->initialized = 1;
1305 inode->i_fop = &sel_bool_ops;
1306 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1307 d_add(dentry, inode);
1308 }
1309 bool_num = num;
1310 bool_pending_names = names;
1311 bool_pending_values = values;
1312
1313 free_page((unsigned long)page);
1314 return 0;
1315 out:
1316 free_page((unsigned long)page);
1317
1318 if (names) {
1319 for (i = 0; i < num; i++)
1320 kfree(names[i]);
1321 kfree(names);
1322 }
1323 kfree(values);
1324 sel_remove_entries(dir);
1325
1326 return ret;
1327 }
1328
1329 #define NULL_FILE_NAME "null"
1330
1331 struct path selinux_null;
1332
1333 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1334 size_t count, loff_t *ppos)
1335 {
1336 char tmpbuf[TMPBUFLEN];
1337 ssize_t length;
1338
1339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1341 }
1342
1343 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1344 const char __user *buf,
1345 size_t count, loff_t *ppos)
1346
1347 {
1348 char *page;
1349 ssize_t ret;
1350 int new_value;
1351
1352 ret = task_has_security(current, SECURITY__SETSECPARAM);
1353 if (ret)
1354 return ret;
1355
1356 if (count >= PAGE_SIZE)
1357 return -ENOMEM;
1358
1359 /* No partial writes. */
1360 if (*ppos != 0)
1361 return -EINVAL;
1362
1363 page = memdup_user_nul(buf, count);
1364 if (IS_ERR(page))
1365 return PTR_ERR(page);
1366
1367 ret = -EINVAL;
1368 if (sscanf(page, "%u", &new_value) != 1)
1369 goto out;
1370
1371 avc_cache_threshold = new_value;
1372
1373 ret = count;
1374 out:
1375 kfree(page);
1376 return ret;
1377 }
1378
1379 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1380 size_t count, loff_t *ppos)
1381 {
1382 char *page;
1383 ssize_t length;
1384
1385 page = (char *)__get_free_page(GFP_KERNEL);
1386 if (!page)
1387 return -ENOMEM;
1388
1389 length = avc_get_hash_stats(page);
1390 if (length >= 0)
1391 length = simple_read_from_buffer(buf, count, ppos, page, length);
1392 free_page((unsigned long)page);
1393
1394 return length;
1395 }
1396
1397 static const struct file_operations sel_avc_cache_threshold_ops = {
1398 .read = sel_read_avc_cache_threshold,
1399 .write = sel_write_avc_cache_threshold,
1400 .llseek = generic_file_llseek,
1401 };
1402
1403 static const struct file_operations sel_avc_hash_stats_ops = {
1404 .read = sel_read_avc_hash_stats,
1405 .llseek = generic_file_llseek,
1406 };
1407
1408 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1409 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1410 {
1411 int cpu;
1412
1413 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1414 if (!cpu_possible(cpu))
1415 continue;
1416 *idx = cpu + 1;
1417 return &per_cpu(avc_cache_stats, cpu);
1418 }
1419 return NULL;
1420 }
1421
1422 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1423 {
1424 loff_t n = *pos - 1;
1425
1426 if (*pos == 0)
1427 return SEQ_START_TOKEN;
1428
1429 return sel_avc_get_stat_idx(&n);
1430 }
1431
1432 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1433 {
1434 return sel_avc_get_stat_idx(pos);
1435 }
1436
1437 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1438 {
1439 struct avc_cache_stats *st = v;
1440
1441 if (v == SEQ_START_TOKEN)
1442 seq_printf(seq, "lookups hits misses allocations reclaims "
1443 "frees\n");
1444 else {
1445 unsigned int lookups = st->lookups;
1446 unsigned int misses = st->misses;
1447 unsigned int hits = lookups - misses;
1448 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1449 hits, misses, st->allocations,
1450 st->reclaims, st->frees);
1451 }
1452 return 0;
1453 }
1454
1455 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1456 { }
1457
1458 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1459 .start = sel_avc_stats_seq_start,
1460 .next = sel_avc_stats_seq_next,
1461 .show = sel_avc_stats_seq_show,
1462 .stop = sel_avc_stats_seq_stop,
1463 };
1464
1465 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1466 {
1467 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1468 }
1469
1470 static const struct file_operations sel_avc_cache_stats_ops = {
1471 .open = sel_open_avc_cache_stats,
1472 .read = seq_read,
1473 .llseek = seq_lseek,
1474 .release = seq_release,
1475 };
1476 #endif
1477
1478 static int sel_make_avc_files(struct dentry *dir)
1479 {
1480 int i;
1481 static struct tree_descr files[] = {
1482 { "cache_threshold",
1483 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1484 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1485 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1486 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1487 #endif
1488 };
1489
1490 for (i = 0; i < ARRAY_SIZE(files); i++) {
1491 struct inode *inode;
1492 struct dentry *dentry;
1493
1494 dentry = d_alloc_name(dir, files[i].name);
1495 if (!dentry)
1496 return -ENOMEM;
1497
1498 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1499 if (!inode)
1500 return -ENOMEM;
1501
1502 inode->i_fop = files[i].ops;
1503 inode->i_ino = ++sel_last_ino;
1504 d_add(dentry, inode);
1505 }
1506
1507 return 0;
1508 }
1509
1510 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1511 size_t count, loff_t *ppos)
1512 {
1513 char *con;
1514 u32 sid, len;
1515 ssize_t ret;
1516
1517 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1518 ret = security_sid_to_context(sid, &con, &len);
1519 if (ret)
1520 return ret;
1521
1522 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1523 kfree(con);
1524 return ret;
1525 }
1526
1527 static const struct file_operations sel_initcon_ops = {
1528 .read = sel_read_initcon,
1529 .llseek = generic_file_llseek,
1530 };
1531
1532 static int sel_make_initcon_files(struct dentry *dir)
1533 {
1534 int i;
1535
1536 for (i = 1; i <= SECINITSID_NUM; i++) {
1537 struct inode *inode;
1538 struct dentry *dentry;
1539 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1540 if (!dentry)
1541 return -ENOMEM;
1542
1543 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1544 if (!inode)
1545 return -ENOMEM;
1546
1547 inode->i_fop = &sel_initcon_ops;
1548 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1549 d_add(dentry, inode);
1550 }
1551
1552 return 0;
1553 }
1554
1555 static inline unsigned long sel_class_to_ino(u16 class)
1556 {
1557 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1558 }
1559
1560 static inline u16 sel_ino_to_class(unsigned long ino)
1561 {
1562 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1563 }
1564
1565 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1566 {
1567 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1568 }
1569
1570 static inline u32 sel_ino_to_perm(unsigned long ino)
1571 {
1572 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1573 }
1574
1575 static ssize_t sel_read_class(struct file *file, char __user *buf,
1576 size_t count, loff_t *ppos)
1577 {
1578 unsigned long ino = file_inode(file)->i_ino;
1579 char res[TMPBUFLEN];
1580 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1581 return simple_read_from_buffer(buf, count, ppos, res, len);
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 unsigned long ino = file_inode(file)->i_ino;
1593 char res[TMPBUFLEN];
1594 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1595 return simple_read_from_buffer(buf, count, ppos, res, len);
1596 }
1597
1598 static const struct file_operations sel_perm_ops = {
1599 .read = sel_read_perm,
1600 .llseek = generic_file_llseek,
1601 };
1602
1603 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1604 size_t count, loff_t *ppos)
1605 {
1606 int value;
1607 char tmpbuf[TMPBUFLEN];
1608 ssize_t length;
1609 unsigned long i_ino = file_inode(file)->i_ino;
1610
1611 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1612 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1613
1614 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1615 }
1616
1617 static const struct file_operations sel_policycap_ops = {
1618 .read = sel_read_policycap,
1619 .llseek = generic_file_llseek,
1620 };
1621
1622 static int sel_make_perm_files(char *objclass, int classvalue,
1623 struct dentry *dir)
1624 {
1625 int i, rc, nperms;
1626 char **perms;
1627
1628 rc = security_get_permissions(objclass, &perms, &nperms);
1629 if (rc)
1630 return rc;
1631
1632 for (i = 0; i < nperms; i++) {
1633 struct inode *inode;
1634 struct dentry *dentry;
1635
1636 rc = -ENOMEM;
1637 dentry = d_alloc_name(dir, perms[i]);
1638 if (!dentry)
1639 goto out;
1640
1641 rc = -ENOMEM;
1642 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1643 if (!inode)
1644 goto out;
1645
1646 inode->i_fop = &sel_perm_ops;
1647 /* i+1 since perm values are 1-indexed */
1648 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1649 d_add(dentry, inode);
1650 }
1651 rc = 0;
1652 out:
1653 for (i = 0; i < nperms; i++)
1654 kfree(perms[i]);
1655 kfree(perms);
1656 return rc;
1657 }
1658
1659 static int sel_make_class_dir_entries(char *classname, int index,
1660 struct dentry *dir)
1661 {
1662 struct dentry *dentry = NULL;
1663 struct inode *inode = NULL;
1664 int rc;
1665
1666 dentry = d_alloc_name(dir, "index");
1667 if (!dentry)
1668 return -ENOMEM;
1669
1670 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1671 if (!inode)
1672 return -ENOMEM;
1673
1674 inode->i_fop = &sel_class_ops;
1675 inode->i_ino = sel_class_to_ino(index);
1676 d_add(dentry, inode);
1677
1678 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1679 if (IS_ERR(dentry))
1680 return PTR_ERR(dentry);
1681
1682 rc = sel_make_perm_files(classname, index, dentry);
1683
1684 return rc;
1685 }
1686
1687 static int sel_make_classes(void)
1688 {
1689 int rc, nclasses, i;
1690 char **classes;
1691
1692 /* delete any existing entries */
1693 sel_remove_entries(class_dir);
1694
1695 rc = security_get_classes(&classes, &nclasses);
1696 if (rc)
1697 return rc;
1698
1699 /* +2 since classes are 1-indexed */
1700 last_class_ino = sel_class_to_ino(nclasses + 2);
1701
1702 for (i = 0; i < nclasses; i++) {
1703 struct dentry *class_name_dir;
1704
1705 class_name_dir = sel_make_dir(class_dir, classes[i],
1706 &last_class_ino);
1707 if (IS_ERR(class_name_dir)) {
1708 rc = PTR_ERR(class_name_dir);
1709 goto out;
1710 }
1711
1712 /* i+1 since class values are 1-indexed */
1713 rc = sel_make_class_dir_entries(classes[i], i + 1,
1714 class_name_dir);
1715 if (rc)
1716 goto out;
1717 }
1718 rc = 0;
1719 out:
1720 for (i = 0; i < nclasses; i++)
1721 kfree(classes[i]);
1722 kfree(classes);
1723 return rc;
1724 }
1725
1726 static int sel_make_policycap(void)
1727 {
1728 unsigned int iter;
1729 struct dentry *dentry = NULL;
1730 struct inode *inode = NULL;
1731
1732 sel_remove_entries(policycap_dir);
1733
1734 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1735 if (iter < ARRAY_SIZE(policycap_names))
1736 dentry = d_alloc_name(policycap_dir,
1737 policycap_names[iter]);
1738 else
1739 dentry = d_alloc_name(policycap_dir, "unknown");
1740
1741 if (dentry == NULL)
1742 return -ENOMEM;
1743
1744 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1745 if (inode == NULL)
1746 return -ENOMEM;
1747
1748 inode->i_fop = &sel_policycap_ops;
1749 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1750 d_add(dentry, inode);
1751 }
1752
1753 return 0;
1754 }
1755
1756 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1757 unsigned long *ino)
1758 {
1759 struct dentry *dentry = d_alloc_name(dir, name);
1760 struct inode *inode;
1761
1762 if (!dentry)
1763 return ERR_PTR(-ENOMEM);
1764
1765 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1766 if (!inode) {
1767 dput(dentry);
1768 return ERR_PTR(-ENOMEM);
1769 }
1770
1771 inode->i_op = &simple_dir_inode_operations;
1772 inode->i_fop = &simple_dir_operations;
1773 inode->i_ino = ++(*ino);
1774 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1775 inc_nlink(inode);
1776 d_add(dentry, inode);
1777 /* bump link count on parent directory, too */
1778 inc_nlink(d_inode(dir));
1779
1780 return dentry;
1781 }
1782
1783 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1784 {
1785 int ret;
1786 struct dentry *dentry;
1787 struct inode *inode;
1788 struct inode_security_struct *isec;
1789
1790 static struct tree_descr selinux_files[] = {
1791 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1792 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1793 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1794 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1795 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1799 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1800 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1801 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1802 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1804 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1805 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1806 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1807 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1808 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1809 S_IWUGO},
1810 /* last one */ {""}
1811 };
1812 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1813 if (ret)
1814 goto err;
1815
1816 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1817 if (IS_ERR(bool_dir)) {
1818 ret = PTR_ERR(bool_dir);
1819 bool_dir = NULL;
1820 goto err;
1821 }
1822
1823 ret = -ENOMEM;
1824 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1825 if (!dentry)
1826 goto err;
1827
1828 ret = -ENOMEM;
1829 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1830 if (!inode)
1831 goto err;
1832
1833 inode->i_ino = ++sel_last_ino;
1834 isec = (struct inode_security_struct *)inode->i_security;
1835 isec->sid = SECINITSID_DEVNULL;
1836 isec->sclass = SECCLASS_CHR_FILE;
1837 isec->initialized = 1;
1838
1839 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1840 d_add(dentry, inode);
1841 selinux_null.dentry = dentry;
1842
1843 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1844 if (IS_ERR(dentry)) {
1845 ret = PTR_ERR(dentry);
1846 goto err;
1847 }
1848
1849 ret = sel_make_avc_files(dentry);
1850 if (ret)
1851 goto err;
1852
1853 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1854 if (IS_ERR(dentry)) {
1855 ret = PTR_ERR(dentry);
1856 goto err;
1857 }
1858
1859 ret = sel_make_initcon_files(dentry);
1860 if (ret)
1861 goto err;
1862
1863 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1864 if (IS_ERR(class_dir)) {
1865 ret = PTR_ERR(class_dir);
1866 class_dir = NULL;
1867 goto err;
1868 }
1869
1870 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1871 if (IS_ERR(policycap_dir)) {
1872 ret = PTR_ERR(policycap_dir);
1873 policycap_dir = NULL;
1874 goto err;
1875 }
1876 return 0;
1877 err:
1878 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1879 __func__);
1880 return ret;
1881 }
1882
1883 static struct dentry *sel_mount(struct file_system_type *fs_type,
1884 int flags, const char *dev_name, void *data)
1885 {
1886 return mount_single(fs_type, flags, data, sel_fill_super);
1887 }
1888
1889 static struct file_system_type sel_fs_type = {
1890 .name = "selinuxfs",
1891 .mount = sel_mount,
1892 .kill_sb = kill_litter_super,
1893 };
1894
1895 struct vfsmount *selinuxfs_mount;
1896
1897 static int __init init_sel_fs(void)
1898 {
1899 int err;
1900
1901 if (!selinux_enabled)
1902 return 0;
1903
1904 err = sysfs_create_mount_point(fs_kobj, "selinux");
1905 if (err)
1906 return err;
1907
1908 err = register_filesystem(&sel_fs_type);
1909 if (err) {
1910 sysfs_remove_mount_point(fs_kobj, "selinux");
1911 return err;
1912 }
1913
1914 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1915 if (IS_ERR(selinuxfs_mount)) {
1916 printk(KERN_ERR "selinuxfs: could not mount!\n");
1917 err = PTR_ERR(selinuxfs_mount);
1918 selinuxfs_mount = NULL;
1919 }
1920
1921 return err;
1922 }
1923
1924 __initcall(init_sel_fs);
1925
1926 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1927 void exit_sel_fs(void)
1928 {
1929 sysfs_remove_mount_point(fs_kobj, "selinux");
1930 kern_unmount(selinuxfs_mount);
1931 unregister_filesystem(&sel_fs_type);
1932 }
1933 #endif
Linux kernel - Deliverables
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