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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 */
45static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms",
48 "redhat1",
49 "always_check_network"
50};
51
52unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
53
54static 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
63static DEFINE_MUTEX(sel_mutex);
64
65/* global data for booleans */
66static struct dentry *bool_dir;
67static int bool_num;
68static char **bool_pending_names;
69static int *bool_pending_values;
70
71/* global data for classes */
72static struct dentry *class_dir;
73static unsigned long last_class_ino;
74
75static char policy_opened;
76
77/* global data for policy capabilities */
78static struct dentry *policycap_dir;
79
80/* Check whether a task is allowed to use a security operation. */
81static 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
99enum 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
123static 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
132static 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
143static 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;
182out:
183 kfree(page);
184 return length;
185}
186#else
187#define sel_write_enforce NULL
188#endif
189
190static const struct file_operations sel_enforce_ops = {
191 .read = sel_read_enforce,
192 .write = sel_write_enforce,
193 .llseek = generic_file_llseek,
194};
195
196static 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
209static const struct file_operations sel_handle_unknown_ops = {
210 .read = sel_read_handle_unknown,
211 .llseek = generic_file_llseek,
212};
213
214static 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
226static 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
238static 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
260static 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
268static 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;
302out:
303 kfree(page);
304 return length;
305}
306#else
307#define sel_write_disable NULL
308#endif
309
310static const struct file_operations sel_disable_ops = {
311 .write = sel_write_disable,
312 .llseek = generic_file_llseek,
313};
314
315static 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
325static 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 */
331static int sel_make_bools(void);
332static int sel_make_classes(void);
333static int sel_make_policycap(void);
334
335/* declaration for sel_make_class_dirs */
336static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
337 unsigned long *ino);
338
339static 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
350static const struct file_operations sel_mls_ops = {
351 .read = sel_read_mls,
352 .llseek = generic_file_llseek,
353};
354
355struct policy_load_memory {
356 size_t len;
357 void *data;
358};
359
360static 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;
399err:
400 mutex_unlock(&sel_mutex);
401
402 if (plm)
403 vfree(plm->data);
404 kfree(plm);
405 return rc;
406}
407
408static 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
422static 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);
435out:
436 mutex_unlock(&sel_mutex);
437 return ret;
438}
439
440static 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
462static const struct vm_operations_struct sel_mmap_policy_ops = {
463 .fault = sel_mmap_policy_fault,
464 .page_mkwrite = sel_mmap_policy_fault,
465};
466
467static 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
483static 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
491static 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
540out1:
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));
545out:
546 mutex_unlock(&sel_mutex);
547 vfree(data);
548 return length;
549}
550
551static const struct file_operations sel_load_ops = {
552 .write = sel_write_load,
553 .llseek = generic_file_llseek,
554};
555
556static 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;
583out:
584 kfree(canon);
585 return length;
586}
587
588static 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
598static 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;
626out:
627 kfree(page);
628 return length;
629}
630static const struct file_operations sel_checkreqprot_ops = {
631 .read = sel_read_checkreqprot,
632 .write = sel_write_checkreqprot,
633 .llseek = generic_file_llseek,
634};
635
636static 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;
700out:
701 kfree(req);
702 kfree(oldcon);
703 kfree(newcon);
704 kfree(taskcon);
705 return rc;
706}
707
708static 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 */
716static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
717static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
718static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
719static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
720static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
721
722static 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
731static 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
752static 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
765static 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);
806out:
807 kfree(tcon);
808 kfree(scon);
809 return length;
810}
811
812static 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;
903out:
904 kfree(newcon);
905 kfree(namebuf);
906 kfree(tcon);
907 kfree(scon);
908 return length;
909}
910
911static 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;
960out:
961 kfree(newcon);
962 kfree(tcon);
963 kfree(scon);
964 return length;
965}
966
967static 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 }
1020out:
1021 kfree(sids);
1022 kfree(user);
1023 kfree(con);
1024 return length;
1025}
1026
1027static 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;
1079out:
1080 kfree(newcon);
1081 kfree(tcon);
1082 kfree(scon);
1083 return length;
1084}
1085
1086static 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
1097static 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);
1126out:
1127 mutex_unlock(&sel_mutex);
1128 free_page((unsigned long)page);
1129 return ret;
1130}
1131
1132static 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
1177out:
1178 mutex_unlock(&sel_mutex);
1179 kfree(page);
1180 return length;
1181}
1182
1183static const struct file_operations sel_bool_ops = {
1184 .read = sel_read_bool,
1185 .write = sel_write_bool,
1186 .llseek = generic_file_llseek,
1187};
1188
1189static 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
1230out:
1231 mutex_unlock(&sel_mutex);
1232 kfree(page);
1233 return length;
1234}
1235
1236static const struct file_operations sel_commit_bools_ops = {
1237 .write = sel_commit_bools_write,
1238 .llseek = generic_file_llseek,
1239};
1240
1241static 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
1249static 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;
1315out:
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
1331struct path selinux_null;
1332
1333static 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
1343static 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;
1374out:
1375 kfree(page);
1376 return ret;
1377}
1378
1379static 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
1397static 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
1403static 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
1409static 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
1422static 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
1432static 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
1437static 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
1455static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1456{ }
1457
1458static 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
1465static 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
1470static 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
1478static 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
1510static 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
1527static const struct file_operations sel_initcon_ops = {
1528 .read = sel_read_initcon,
1529 .llseek = generic_file_llseek,
1530};
1531
1532static 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
1555static inline unsigned long sel_class_to_ino(u16 class)
1556{
1557 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1558}
1559
1560static inline u16 sel_ino_to_class(unsigned long ino)
1561{
1562 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1563}
1564
1565static 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
1570static inline u32 sel_ino_to_perm(unsigned long ino)
1571{
1572 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1573}
1574
1575static 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
1584static const struct file_operations sel_class_ops = {
1585 .read = sel_read_class,
1586 .llseek = generic_file_llseek,
1587};
1588
1589static 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
1598static const struct file_operations sel_perm_ops = {
1599 .read = sel_read_perm,
1600 .llseek = generic_file_llseek,
1601};
1602
1603static 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
1617static const struct file_operations sel_policycap_ops = {
1618 .read = sel_read_policycap,
1619 .llseek = generic_file_llseek,
1620};
1621
1622static 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;
1652out:
1653 for (i = 0; i < nperms; i++)
1654 kfree(perms[i]);
1655 kfree(perms);
1656 return rc;
1657}
1658
1659static 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
1687static 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;
1719out:
1720 for (i = 0; i < nclasses; i++)
1721 kfree(classes[i]);
1722 kfree(classes);
1723 return rc;
1724}
1725
1726static 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
1756static 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
1783static 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;
1877err:
1878 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1879 __func__);
1880 return ret;
1881}
1882
1883static 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
1889static struct file_system_type sel_fs_type = {
1890 .name = "selinuxfs",
1891 .mount = sel_mount,
1892 .kill_sb = kill_litter_super,
1893};
1894
1895struct vfsmount *selinuxfs_mount;
1896
1897static 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
1927void 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
1// SPDX-License-Identifier: GPL-2.0-only
2/* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 *
4 * Added conditional policy language extensions
5 *
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 *
8 * Added support for the policy capability bitmap
9 *
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/pagemap.h>
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19#include <linux/fs.h>
20#include <linux/fs_context.h>
21#include <linux/mount.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
44enum sel_inos {
45 SEL_ROOT_INO = 2,
46 SEL_LOAD, /* load policy */
47 SEL_ENFORCE, /* get or set enforcing status */
48 SEL_CONTEXT, /* validate context */
49 SEL_ACCESS, /* compute access decision */
50 SEL_CREATE, /* compute create labeling decision */
51 SEL_RELABEL, /* compute relabeling decision */
52 SEL_USER, /* compute reachable user contexts */
53 SEL_POLICYVERS, /* return policy version for this kernel */
54 SEL_COMMIT_BOOLS, /* commit new boolean values */
55 SEL_MLS, /* return if MLS policy is enabled */
56 SEL_DISABLE, /* disable SELinux until next reboot */
57 SEL_MEMBER, /* compute polyinstantiation membership decision */
58 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
59 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
60 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
61 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
62 SEL_STATUS, /* export current status using mmap() */
63 SEL_POLICY, /* allow userspace to read the in kernel policy */
64 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
65 SEL_INO_NEXT, /* The next inode number to use */
66};
67
68struct selinux_fs_info {
69 struct dentry *bool_dir;
70 unsigned int bool_num;
71 char **bool_pending_names;
72 unsigned int *bool_pending_values;
73 struct dentry *class_dir;
74 unsigned long last_class_ino;
75 bool policy_opened;
76 struct dentry *policycap_dir;
77 struct mutex mutex;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
81};
82
83static int selinux_fs_info_create(struct super_block *sb)
84{
85 struct selinux_fs_info *fsi;
86
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
88 if (!fsi)
89 return -ENOMEM;
90
91 mutex_init(&fsi->mutex);
92 fsi->last_ino = SEL_INO_NEXT - 1;
93 fsi->state = &selinux_state;
94 fsi->sb = sb;
95 sb->s_fs_info = fsi;
96 return 0;
97}
98
99static void selinux_fs_info_free(struct super_block *sb)
100{
101 struct selinux_fs_info *fsi = sb->s_fs_info;
102 int i;
103
104 if (fsi) {
105 for (i = 0; i < fsi->bool_num; i++)
106 kfree(fsi->bool_pending_names[i]);
107 kfree(fsi->bool_pending_names);
108 kfree(fsi->bool_pending_values);
109 }
110 kfree(sb->s_fs_info);
111 sb->s_fs_info = NULL;
112}
113
114#define SEL_INITCON_INO_OFFSET 0x01000000
115#define SEL_BOOL_INO_OFFSET 0x02000000
116#define SEL_CLASS_INO_OFFSET 0x04000000
117#define SEL_POLICYCAP_INO_OFFSET 0x08000000
118#define SEL_INO_MASK 0x00ffffff
119
120#define TMPBUFLEN 12
121static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
122 size_t count, loff_t *ppos)
123{
124 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
125 char tmpbuf[TMPBUFLEN];
126 ssize_t length;
127
128 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
129 enforcing_enabled(fsi->state));
130 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
131}
132
133#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
134static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
135 size_t count, loff_t *ppos)
136
137{
138 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
139 struct selinux_state *state = fsi->state;
140 char *page = NULL;
141 ssize_t length;
142 int old_value, new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146
147 /* No partial writes. */
148 if (*ppos != 0)
149 return -EINVAL;
150
151 page = memdup_user_nul(buf, count);
152 if (IS_ERR(page))
153 return PTR_ERR(page);
154
155 length = -EINVAL;
156 if (sscanf(page, "%d", &new_value) != 1)
157 goto out;
158
159 new_value = !!new_value;
160
161 old_value = enforcing_enabled(state);
162 if (new_value != old_value) {
163 length = avc_has_perm(&selinux_state,
164 current_sid(), SECINITSID_SECURITY,
165 SECCLASS_SECURITY, SECURITY__SETENFORCE,
166 NULL);
167 if (length)
168 goto out;
169 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
171 " enabled=1 old-enabled=1 lsm=selinux res=1",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 enforcing_set(state, new_value);
176 if (new_value)
177 avc_ss_reset(state->avc, 0);
178 selnl_notify_setenforce(new_value);
179 selinux_status_update_setenforce(state, new_value);
180 if (!new_value)
181 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
182 }
183 length = count;
184out:
185 kfree(page);
186 return length;
187}
188#else
189#define sel_write_enforce NULL
190#endif
191
192static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
196};
197
198static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200{
201 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
202 struct selinux_state *state = fsi->state;
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = file_inode(filp)->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown(state) :
208 !security_get_allow_unknown(state);
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212}
213
214static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
217};
218
219static int sel_open_handle_status(struct inode *inode, struct file *filp)
220{
221 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
222 struct page *status = selinux_kernel_status_page(fsi->state);
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230}
231
232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234{
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242}
243
244static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246{
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264}
265
266static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271};
272
273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277{
278 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
279 char *page;
280 ssize_t length;
281 int new_value;
282 int enforcing;
283
284 /* NOTE: we are now officially considering runtime disable as
285 * deprecated, and using it will become increasingly painful
286 * (e.g. sleeping/blocking) as we progress through future
287 * kernel releases until eventually it is removed
288 */
289 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
290
291 if (count >= PAGE_SIZE)
292 return -ENOMEM;
293
294 /* No partial writes. */
295 if (*ppos != 0)
296 return -EINVAL;
297
298 page = memdup_user_nul(buf, count);
299 if (IS_ERR(page))
300 return PTR_ERR(page);
301
302 length = -EINVAL;
303 if (sscanf(page, "%d", &new_value) != 1)
304 goto out;
305
306 if (new_value) {
307 enforcing = enforcing_enabled(fsi->state);
308 length = selinux_disable(fsi->state);
309 if (length)
310 goto out;
311 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
312 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
313 " enabled=0 old-enabled=1 lsm=selinux res=1",
314 enforcing, enforcing,
315 from_kuid(&init_user_ns, audit_get_loginuid(current)),
316 audit_get_sessionid(current));
317 }
318
319 length = count;
320out:
321 kfree(page);
322 return length;
323}
324#else
325#define sel_write_disable NULL
326#endif
327
328static const struct file_operations sel_disable_ops = {
329 .write = sel_write_disable,
330 .llseek = generic_file_llseek,
331};
332
333static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
334 size_t count, loff_t *ppos)
335{
336 char tmpbuf[TMPBUFLEN];
337 ssize_t length;
338
339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
341}
342
343static const struct file_operations sel_policyvers_ops = {
344 .read = sel_read_policyvers,
345 .llseek = generic_file_llseek,
346};
347
348/* declaration for sel_write_load */
349static int sel_make_bools(struct selinux_fs_info *fsi);
350static int sel_make_classes(struct selinux_fs_info *fsi);
351static int sel_make_policycap(struct selinux_fs_info *fsi);
352
353/* declaration for sel_make_class_dirs */
354static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
355 unsigned long *ino);
356
357static ssize_t sel_read_mls(struct file *filp, char __user *buf,
358 size_t count, loff_t *ppos)
359{
360 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
361 char tmpbuf[TMPBUFLEN];
362 ssize_t length;
363
364 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
365 security_mls_enabled(fsi->state));
366 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
367}
368
369static const struct file_operations sel_mls_ops = {
370 .read = sel_read_mls,
371 .llseek = generic_file_llseek,
372};
373
374struct policy_load_memory {
375 size_t len;
376 void *data;
377};
378
379static int sel_open_policy(struct inode *inode, struct file *filp)
380{
381 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
382 struct selinux_state *state = fsi->state;
383 struct policy_load_memory *plm = NULL;
384 int rc;
385
386 BUG_ON(filp->private_data);
387
388 mutex_lock(&fsi->mutex);
389
390 rc = avc_has_perm(&selinux_state,
391 current_sid(), SECINITSID_SECURITY,
392 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
393 if (rc)
394 goto err;
395
396 rc = -EBUSY;
397 if (fsi->policy_opened)
398 goto err;
399
400 rc = -ENOMEM;
401 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
402 if (!plm)
403 goto err;
404
405 if (i_size_read(inode) != security_policydb_len(state)) {
406 inode_lock(inode);
407 i_size_write(inode, security_policydb_len(state));
408 inode_unlock(inode);
409 }
410
411 rc = security_read_policy(state, &plm->data, &plm->len);
412 if (rc)
413 goto err;
414
415 fsi->policy_opened = 1;
416
417 filp->private_data = plm;
418
419 mutex_unlock(&fsi->mutex);
420
421 return 0;
422err:
423 mutex_unlock(&fsi->mutex);
424
425 if (plm)
426 vfree(plm->data);
427 kfree(plm);
428 return rc;
429}
430
431static int sel_release_policy(struct inode *inode, struct file *filp)
432{
433 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
434 struct policy_load_memory *plm = filp->private_data;
435
436 BUG_ON(!plm);
437
438 fsi->policy_opened = 0;
439
440 vfree(plm->data);
441 kfree(plm);
442
443 return 0;
444}
445
446static ssize_t sel_read_policy(struct file *filp, char __user *buf,
447 size_t count, loff_t *ppos)
448{
449 struct policy_load_memory *plm = filp->private_data;
450 int ret;
451
452 ret = avc_has_perm(&selinux_state,
453 current_sid(), SECINITSID_SECURITY,
454 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
455 if (ret)
456 return ret;
457
458 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
459}
460
461static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
462{
463 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
464 unsigned long offset;
465 struct page *page;
466
467 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
468 return VM_FAULT_SIGBUS;
469
470 offset = vmf->pgoff << PAGE_SHIFT;
471 if (offset >= roundup(plm->len, PAGE_SIZE))
472 return VM_FAULT_SIGBUS;
473
474 page = vmalloc_to_page(plm->data + offset);
475 get_page(page);
476
477 vmf->page = page;
478
479 return 0;
480}
481
482static const struct vm_operations_struct sel_mmap_policy_ops = {
483 .fault = sel_mmap_policy_fault,
484 .page_mkwrite = sel_mmap_policy_fault,
485};
486
487static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
488{
489 if (vma->vm_flags & VM_SHARED) {
490 /* do not allow mprotect to make mapping writable */
491 vma->vm_flags &= ~VM_MAYWRITE;
492
493 if (vma->vm_flags & VM_WRITE)
494 return -EACCES;
495 }
496
497 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
498 vma->vm_ops = &sel_mmap_policy_ops;
499
500 return 0;
501}
502
503static const struct file_operations sel_policy_ops = {
504 .open = sel_open_policy,
505 .read = sel_read_policy,
506 .mmap = sel_mmap_policy,
507 .release = sel_release_policy,
508 .llseek = generic_file_llseek,
509};
510
511static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
512{
513 int ret;
514
515 ret = sel_make_bools(fsi);
516 if (ret) {
517 pr_err("SELinux: failed to load policy booleans\n");
518 return ret;
519 }
520
521 ret = sel_make_classes(fsi);
522 if (ret) {
523 pr_err("SELinux: failed to load policy classes\n");
524 return ret;
525 }
526
527 ret = sel_make_policycap(fsi);
528 if (ret) {
529 pr_err("SELinux: failed to load policy capabilities\n");
530 return ret;
531 }
532
533 return 0;
534}
535
536static ssize_t sel_write_load(struct file *file, const char __user *buf,
537 size_t count, loff_t *ppos)
538
539{
540 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
541 ssize_t length;
542 void *data = NULL;
543
544 mutex_lock(&fsi->mutex);
545
546 length = avc_has_perm(&selinux_state,
547 current_sid(), SECINITSID_SECURITY,
548 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
549 if (length)
550 goto out;
551
552 /* No partial writes. */
553 length = -EINVAL;
554 if (*ppos != 0)
555 goto out;
556
557 length = -ENOMEM;
558 data = vmalloc(count);
559 if (!data)
560 goto out;
561
562 length = -EFAULT;
563 if (copy_from_user(data, buf, count) != 0)
564 goto out;
565
566 length = security_load_policy(fsi->state, data, count);
567 if (length) {
568 pr_warn_ratelimited("SELinux: failed to load policy\n");
569 goto out;
570 }
571
572 length = sel_make_policy_nodes(fsi);
573 if (length)
574 goto out1;
575
576 length = count;
577
578out1:
579 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
580 "auid=%u ses=%u lsm=selinux res=1",
581 from_kuid(&init_user_ns, audit_get_loginuid(current)),
582 audit_get_sessionid(current));
583out:
584 mutex_unlock(&fsi->mutex);
585 vfree(data);
586 return length;
587}
588
589static const struct file_operations sel_load_ops = {
590 .write = sel_write_load,
591 .llseek = generic_file_llseek,
592};
593
594static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
595{
596 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
597 struct selinux_state *state = fsi->state;
598 char *canon = NULL;
599 u32 sid, len;
600 ssize_t length;
601
602 length = avc_has_perm(&selinux_state,
603 current_sid(), SECINITSID_SECURITY,
604 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
605 if (length)
606 goto out;
607
608 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
609 if (length)
610 goto out;
611
612 length = security_sid_to_context(state, sid, &canon, &len);
613 if (length)
614 goto out;
615
616 length = -ERANGE;
617 if (len > SIMPLE_TRANSACTION_LIMIT) {
618 pr_err("SELinux: %s: context size (%u) exceeds "
619 "payload max\n", __func__, len);
620 goto out;
621 }
622
623 memcpy(buf, canon, len);
624 length = len;
625out:
626 kfree(canon);
627 return length;
628}
629
630static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
631 size_t count, loff_t *ppos)
632{
633 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
634 char tmpbuf[TMPBUFLEN];
635 ssize_t length;
636
637 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
638 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
639}
640
641static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
642 size_t count, loff_t *ppos)
643{
644 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
645 char *page;
646 ssize_t length;
647 unsigned int new_value;
648
649 length = avc_has_perm(&selinux_state,
650 current_sid(), SECINITSID_SECURITY,
651 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
652 NULL);
653 if (length)
654 return length;
655
656 if (count >= PAGE_SIZE)
657 return -ENOMEM;
658
659 /* No partial writes. */
660 if (*ppos != 0)
661 return -EINVAL;
662
663 page = memdup_user_nul(buf, count);
664 if (IS_ERR(page))
665 return PTR_ERR(page);
666
667 length = -EINVAL;
668 if (sscanf(page, "%u", &new_value) != 1)
669 goto out;
670
671 if (new_value) {
672 char comm[sizeof(current->comm)];
673
674 memcpy(comm, current->comm, sizeof(comm));
675 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
676 comm, current->pid);
677 }
678
679 fsi->state->checkreqprot = new_value ? 1 : 0;
680 length = count;
681out:
682 kfree(page);
683 return length;
684}
685static const struct file_operations sel_checkreqprot_ops = {
686 .read = sel_read_checkreqprot,
687 .write = sel_write_checkreqprot,
688 .llseek = generic_file_llseek,
689};
690
691static ssize_t sel_write_validatetrans(struct file *file,
692 const char __user *buf,
693 size_t count, loff_t *ppos)
694{
695 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
696 struct selinux_state *state = fsi->state;
697 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
698 char *req = NULL;
699 u32 osid, nsid, tsid;
700 u16 tclass;
701 int rc;
702
703 rc = avc_has_perm(&selinux_state,
704 current_sid(), SECINITSID_SECURITY,
705 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
706 if (rc)
707 goto out;
708
709 rc = -ENOMEM;
710 if (count >= PAGE_SIZE)
711 goto out;
712
713 /* No partial writes. */
714 rc = -EINVAL;
715 if (*ppos != 0)
716 goto out;
717
718 req = memdup_user_nul(buf, count);
719 if (IS_ERR(req)) {
720 rc = PTR_ERR(req);
721 req = NULL;
722 goto out;
723 }
724
725 rc = -ENOMEM;
726 oldcon = kzalloc(count + 1, GFP_KERNEL);
727 if (!oldcon)
728 goto out;
729
730 newcon = kzalloc(count + 1, GFP_KERNEL);
731 if (!newcon)
732 goto out;
733
734 taskcon = kzalloc(count + 1, GFP_KERNEL);
735 if (!taskcon)
736 goto out;
737
738 rc = -EINVAL;
739 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
740 goto out;
741
742 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
743 if (rc)
744 goto out;
745
746 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
747 if (rc)
748 goto out;
749
750 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
751 if (rc)
752 goto out;
753
754 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
755 if (!rc)
756 rc = count;
757out:
758 kfree(req);
759 kfree(oldcon);
760 kfree(newcon);
761 kfree(taskcon);
762 return rc;
763}
764
765static const struct file_operations sel_transition_ops = {
766 .write = sel_write_validatetrans,
767 .llseek = generic_file_llseek,
768};
769
770/*
771 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
772 */
773static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
774static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
775static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
776static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
777static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
778
779static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
780 [SEL_ACCESS] = sel_write_access,
781 [SEL_CREATE] = sel_write_create,
782 [SEL_RELABEL] = sel_write_relabel,
783 [SEL_USER] = sel_write_user,
784 [SEL_MEMBER] = sel_write_member,
785 [SEL_CONTEXT] = sel_write_context,
786};
787
788static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
789{
790 ino_t ino = file_inode(file)->i_ino;
791 char *data;
792 ssize_t rv;
793
794 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
795 return -EINVAL;
796
797 data = simple_transaction_get(file, buf, size);
798 if (IS_ERR(data))
799 return PTR_ERR(data);
800
801 rv = write_op[ino](file, data, size);
802 if (rv > 0) {
803 simple_transaction_set(file, rv);
804 rv = size;
805 }
806 return rv;
807}
808
809static const struct file_operations transaction_ops = {
810 .write = selinux_transaction_write,
811 .read = simple_transaction_read,
812 .release = simple_transaction_release,
813 .llseek = generic_file_llseek,
814};
815
816/*
817 * payload - write methods
818 * If the method has a response, the response should be put in buf,
819 * and the length returned. Otherwise return 0 or and -error.
820 */
821
822static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
823{
824 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
825 struct selinux_state *state = fsi->state;
826 char *scon = NULL, *tcon = NULL;
827 u32 ssid, tsid;
828 u16 tclass;
829 struct av_decision avd;
830 ssize_t length;
831
832 length = avc_has_perm(&selinux_state,
833 current_sid(), SECINITSID_SECURITY,
834 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
835 if (length)
836 goto out;
837
838 length = -ENOMEM;
839 scon = kzalloc(size + 1, GFP_KERNEL);
840 if (!scon)
841 goto out;
842
843 length = -ENOMEM;
844 tcon = kzalloc(size + 1, GFP_KERNEL);
845 if (!tcon)
846 goto out;
847
848 length = -EINVAL;
849 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
850 goto out;
851
852 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
853 if (length)
854 goto out;
855
856 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
857 if (length)
858 goto out;
859
860 security_compute_av_user(state, ssid, tsid, tclass, &avd);
861
862 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
863 "%x %x %x %x %u %x",
864 avd.allowed, 0xffffffff,
865 avd.auditallow, avd.auditdeny,
866 avd.seqno, avd.flags);
867out:
868 kfree(tcon);
869 kfree(scon);
870 return length;
871}
872
873static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
874{
875 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
876 struct selinux_state *state = fsi->state;
877 char *scon = NULL, *tcon = NULL;
878 char *namebuf = NULL, *objname = NULL;
879 u32 ssid, tsid, newsid;
880 u16 tclass;
881 ssize_t length;
882 char *newcon = NULL;
883 u32 len;
884 int nargs;
885
886 length = avc_has_perm(&selinux_state,
887 current_sid(), SECINITSID_SECURITY,
888 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
889 NULL);
890 if (length)
891 goto out;
892
893 length = -ENOMEM;
894 scon = kzalloc(size + 1, GFP_KERNEL);
895 if (!scon)
896 goto out;
897
898 length = -ENOMEM;
899 tcon = kzalloc(size + 1, GFP_KERNEL);
900 if (!tcon)
901 goto out;
902
903 length = -ENOMEM;
904 namebuf = kzalloc(size + 1, GFP_KERNEL);
905 if (!namebuf)
906 goto out;
907
908 length = -EINVAL;
909 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
910 if (nargs < 3 || nargs > 4)
911 goto out;
912 if (nargs == 4) {
913 /*
914 * If and when the name of new object to be queried contains
915 * either whitespace or multibyte characters, they shall be
916 * encoded based on the percentage-encoding rule.
917 * If not encoded, the sscanf logic picks up only left-half
918 * of the supplied name; splitted by a whitespace unexpectedly.
919 */
920 char *r, *w;
921 int c1, c2;
922
923 r = w = namebuf;
924 do {
925 c1 = *r++;
926 if (c1 == '+')
927 c1 = ' ';
928 else if (c1 == '%') {
929 c1 = hex_to_bin(*r++);
930 if (c1 < 0)
931 goto out;
932 c2 = hex_to_bin(*r++);
933 if (c2 < 0)
934 goto out;
935 c1 = (c1 << 4) | c2;
936 }
937 *w++ = c1;
938 } while (c1 != '\0');
939
940 objname = namebuf;
941 }
942
943 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
944 if (length)
945 goto out;
946
947 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
948 if (length)
949 goto out;
950
951 length = security_transition_sid_user(state, ssid, tsid, tclass,
952 objname, &newsid);
953 if (length)
954 goto out;
955
956 length = security_sid_to_context(state, newsid, &newcon, &len);
957 if (length)
958 goto out;
959
960 length = -ERANGE;
961 if (len > SIMPLE_TRANSACTION_LIMIT) {
962 pr_err("SELinux: %s: context size (%u) exceeds "
963 "payload max\n", __func__, len);
964 goto out;
965 }
966
967 memcpy(buf, newcon, len);
968 length = len;
969out:
970 kfree(newcon);
971 kfree(namebuf);
972 kfree(tcon);
973 kfree(scon);
974 return length;
975}
976
977static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
978{
979 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
980 struct selinux_state *state = fsi->state;
981 char *scon = NULL, *tcon = NULL;
982 u32 ssid, tsid, newsid;
983 u16 tclass;
984 ssize_t length;
985 char *newcon = NULL;
986 u32 len;
987
988 length = avc_has_perm(&selinux_state,
989 current_sid(), SECINITSID_SECURITY,
990 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
991 NULL);
992 if (length)
993 goto out;
994
995 length = -ENOMEM;
996 scon = kzalloc(size + 1, GFP_KERNEL);
997 if (!scon)
998 goto out;
999
1000 length = -ENOMEM;
1001 tcon = kzalloc(size + 1, GFP_KERNEL);
1002 if (!tcon)
1003 goto out;
1004
1005 length = -EINVAL;
1006 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1007 goto out;
1008
1009 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1010 if (length)
1011 goto out;
1012
1013 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1014 if (length)
1015 goto out;
1016
1017 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1018 if (length)
1019 goto out;
1020
1021 length = security_sid_to_context(state, newsid, &newcon, &len);
1022 if (length)
1023 goto out;
1024
1025 length = -ERANGE;
1026 if (len > SIMPLE_TRANSACTION_LIMIT)
1027 goto out;
1028
1029 memcpy(buf, newcon, len);
1030 length = len;
1031out:
1032 kfree(newcon);
1033 kfree(tcon);
1034 kfree(scon);
1035 return length;
1036}
1037
1038static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1039{
1040 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1041 struct selinux_state *state = fsi->state;
1042 char *con = NULL, *user = NULL, *ptr;
1043 u32 sid, *sids = NULL;
1044 ssize_t length;
1045 char *newcon;
1046 int i, rc;
1047 u32 len, nsids;
1048
1049 length = avc_has_perm(&selinux_state,
1050 current_sid(), SECINITSID_SECURITY,
1051 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1052 NULL);
1053 if (length)
1054 goto out;
1055
1056 length = -ENOMEM;
1057 con = kzalloc(size + 1, GFP_KERNEL);
1058 if (!con)
1059 goto out;
1060
1061 length = -ENOMEM;
1062 user = kzalloc(size + 1, GFP_KERNEL);
1063 if (!user)
1064 goto out;
1065
1066 length = -EINVAL;
1067 if (sscanf(buf, "%s %s", con, user) != 2)
1068 goto out;
1069
1070 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1071 if (length)
1072 goto out;
1073
1074 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1075 if (length)
1076 goto out;
1077
1078 length = sprintf(buf, "%u", nsids) + 1;
1079 ptr = buf + length;
1080 for (i = 0; i < nsids; i++) {
1081 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1082 if (rc) {
1083 length = rc;
1084 goto out;
1085 }
1086 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1087 kfree(newcon);
1088 length = -ERANGE;
1089 goto out;
1090 }
1091 memcpy(ptr, newcon, len);
1092 kfree(newcon);
1093 ptr += len;
1094 length += len;
1095 }
1096out:
1097 kfree(sids);
1098 kfree(user);
1099 kfree(con);
1100 return length;
1101}
1102
1103static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1104{
1105 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1106 struct selinux_state *state = fsi->state;
1107 char *scon = NULL, *tcon = NULL;
1108 u32 ssid, tsid, newsid;
1109 u16 tclass;
1110 ssize_t length;
1111 char *newcon = NULL;
1112 u32 len;
1113
1114 length = avc_has_perm(&selinux_state,
1115 current_sid(), SECINITSID_SECURITY,
1116 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1117 NULL);
1118 if (length)
1119 goto out;
1120
1121 length = -ENOMEM;
1122 scon = kzalloc(size + 1, GFP_KERNEL);
1123 if (!scon)
1124 goto out;
1125
1126 length = -ENOMEM;
1127 tcon = kzalloc(size + 1, GFP_KERNEL);
1128 if (!tcon)
1129 goto out;
1130
1131 length = -EINVAL;
1132 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1133 goto out;
1134
1135 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1136 if (length)
1137 goto out;
1138
1139 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1140 if (length)
1141 goto out;
1142
1143 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1144 if (length)
1145 goto out;
1146
1147 length = security_sid_to_context(state, newsid, &newcon, &len);
1148 if (length)
1149 goto out;
1150
1151 length = -ERANGE;
1152 if (len > SIMPLE_TRANSACTION_LIMIT) {
1153 pr_err("SELinux: %s: context size (%u) exceeds "
1154 "payload max\n", __func__, len);
1155 goto out;
1156 }
1157
1158 memcpy(buf, newcon, len);
1159 length = len;
1160out:
1161 kfree(newcon);
1162 kfree(tcon);
1163 kfree(scon);
1164 return length;
1165}
1166
1167static struct inode *sel_make_inode(struct super_block *sb, int mode)
1168{
1169 struct inode *ret = new_inode(sb);
1170
1171 if (ret) {
1172 ret->i_mode = mode;
1173 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1174 }
1175 return ret;
1176}
1177
1178static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1179 size_t count, loff_t *ppos)
1180{
1181 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1182 char *page = NULL;
1183 ssize_t length;
1184 ssize_t ret;
1185 int cur_enforcing;
1186 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1187 const char *name = filep->f_path.dentry->d_name.name;
1188
1189 mutex_lock(&fsi->mutex);
1190
1191 ret = -EINVAL;
1192 if (index >= fsi->bool_num || strcmp(name,
1193 fsi->bool_pending_names[index]))
1194 goto out_unlock;
1195
1196 ret = -ENOMEM;
1197 page = (char *)get_zeroed_page(GFP_KERNEL);
1198 if (!page)
1199 goto out_unlock;
1200
1201 cur_enforcing = security_get_bool_value(fsi->state, index);
1202 if (cur_enforcing < 0) {
1203 ret = cur_enforcing;
1204 goto out_unlock;
1205 }
1206 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1207 fsi->bool_pending_values[index]);
1208 mutex_unlock(&fsi->mutex);
1209 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1210out_free:
1211 free_page((unsigned long)page);
1212 return ret;
1213
1214out_unlock:
1215 mutex_unlock(&fsi->mutex);
1216 goto out_free;
1217}
1218
1219static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1220 size_t count, loff_t *ppos)
1221{
1222 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1223 char *page = NULL;
1224 ssize_t length;
1225 int new_value;
1226 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1227 const char *name = filep->f_path.dentry->d_name.name;
1228
1229 if (count >= PAGE_SIZE)
1230 return -ENOMEM;
1231
1232 /* No partial writes. */
1233 if (*ppos != 0)
1234 return -EINVAL;
1235
1236 page = memdup_user_nul(buf, count);
1237 if (IS_ERR(page))
1238 return PTR_ERR(page);
1239
1240 mutex_lock(&fsi->mutex);
1241
1242 length = avc_has_perm(&selinux_state,
1243 current_sid(), SECINITSID_SECURITY,
1244 SECCLASS_SECURITY, SECURITY__SETBOOL,
1245 NULL);
1246 if (length)
1247 goto out;
1248
1249 length = -EINVAL;
1250 if (index >= fsi->bool_num || strcmp(name,
1251 fsi->bool_pending_names[index]))
1252 goto out;
1253
1254 length = -EINVAL;
1255 if (sscanf(page, "%d", &new_value) != 1)
1256 goto out;
1257
1258 if (new_value)
1259 new_value = 1;
1260
1261 fsi->bool_pending_values[index] = new_value;
1262 length = count;
1263
1264out:
1265 mutex_unlock(&fsi->mutex);
1266 kfree(page);
1267 return length;
1268}
1269
1270static const struct file_operations sel_bool_ops = {
1271 .read = sel_read_bool,
1272 .write = sel_write_bool,
1273 .llseek = generic_file_llseek,
1274};
1275
1276static ssize_t sel_commit_bools_write(struct file *filep,
1277 const char __user *buf,
1278 size_t count, loff_t *ppos)
1279{
1280 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1281 char *page = NULL;
1282 ssize_t length;
1283 int new_value;
1284
1285 if (count >= PAGE_SIZE)
1286 return -ENOMEM;
1287
1288 /* No partial writes. */
1289 if (*ppos != 0)
1290 return -EINVAL;
1291
1292 page = memdup_user_nul(buf, count);
1293 if (IS_ERR(page))
1294 return PTR_ERR(page);
1295
1296 mutex_lock(&fsi->mutex);
1297
1298 length = avc_has_perm(&selinux_state,
1299 current_sid(), SECINITSID_SECURITY,
1300 SECCLASS_SECURITY, SECURITY__SETBOOL,
1301 NULL);
1302 if (length)
1303 goto out;
1304
1305 length = -EINVAL;
1306 if (sscanf(page, "%d", &new_value) != 1)
1307 goto out;
1308
1309 length = 0;
1310 if (new_value && fsi->bool_pending_values)
1311 length = security_set_bools(fsi->state, fsi->bool_num,
1312 fsi->bool_pending_values);
1313
1314 if (!length)
1315 length = count;
1316
1317out:
1318 mutex_unlock(&fsi->mutex);
1319 kfree(page);
1320 return length;
1321}
1322
1323static const struct file_operations sel_commit_bools_ops = {
1324 .write = sel_commit_bools_write,
1325 .llseek = generic_file_llseek,
1326};
1327
1328static void sel_remove_entries(struct dentry *de)
1329{
1330 d_genocide(de);
1331 shrink_dcache_parent(de);
1332}
1333
1334#define BOOL_DIR_NAME "booleans"
1335
1336static int sel_make_bools(struct selinux_fs_info *fsi)
1337{
1338 int ret;
1339 ssize_t len;
1340 struct dentry *dentry = NULL;
1341 struct dentry *dir = fsi->bool_dir;
1342 struct inode *inode = NULL;
1343 struct inode_security_struct *isec;
1344 char **names = NULL, *page;
1345 u32 i, num;
1346 int *values = NULL;
1347 u32 sid;
1348
1349 /* remove any existing files */
1350 for (i = 0; i < fsi->bool_num; i++)
1351 kfree(fsi->bool_pending_names[i]);
1352 kfree(fsi->bool_pending_names);
1353 kfree(fsi->bool_pending_values);
1354 fsi->bool_num = 0;
1355 fsi->bool_pending_names = NULL;
1356 fsi->bool_pending_values = NULL;
1357
1358 sel_remove_entries(dir);
1359
1360 ret = -ENOMEM;
1361 page = (char *)get_zeroed_page(GFP_KERNEL);
1362 if (!page)
1363 goto out;
1364
1365 ret = security_get_bools(fsi->state, &num, &names, &values);
1366 if (ret)
1367 goto out;
1368
1369 for (i = 0; i < num; i++) {
1370 ret = -ENOMEM;
1371 dentry = d_alloc_name(dir, names[i]);
1372 if (!dentry)
1373 goto out;
1374
1375 ret = -ENOMEM;
1376 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1377 if (!inode) {
1378 dput(dentry);
1379 goto out;
1380 }
1381
1382 ret = -ENAMETOOLONG;
1383 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1384 if (len >= PAGE_SIZE) {
1385 dput(dentry);
1386 iput(inode);
1387 goto out;
1388 }
1389
1390 isec = selinux_inode(inode);
1391 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1392 SECCLASS_FILE, &sid);
1393 if (ret) {
1394 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1395 page);
1396 sid = SECINITSID_SECURITY;
1397 }
1398
1399 isec->sid = sid;
1400 isec->initialized = LABEL_INITIALIZED;
1401 inode->i_fop = &sel_bool_ops;
1402 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1403 d_add(dentry, inode);
1404 }
1405 fsi->bool_num = num;
1406 fsi->bool_pending_names = names;
1407 fsi->bool_pending_values = values;
1408
1409 free_page((unsigned long)page);
1410 return 0;
1411out:
1412 free_page((unsigned long)page);
1413
1414 if (names) {
1415 for (i = 0; i < num; i++)
1416 kfree(names[i]);
1417 kfree(names);
1418 }
1419 kfree(values);
1420 sel_remove_entries(dir);
1421
1422 return ret;
1423}
1424
1425static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1426 size_t count, loff_t *ppos)
1427{
1428 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1429 struct selinux_state *state = fsi->state;
1430 char tmpbuf[TMPBUFLEN];
1431 ssize_t length;
1432
1433 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1434 avc_get_cache_threshold(state->avc));
1435 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1436}
1437
1438static ssize_t sel_write_avc_cache_threshold(struct file *file,
1439 const char __user *buf,
1440 size_t count, loff_t *ppos)
1441
1442{
1443 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1444 struct selinux_state *state = fsi->state;
1445 char *page;
1446 ssize_t ret;
1447 unsigned int new_value;
1448
1449 ret = avc_has_perm(&selinux_state,
1450 current_sid(), SECINITSID_SECURITY,
1451 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1452 NULL);
1453 if (ret)
1454 return ret;
1455
1456 if (count >= PAGE_SIZE)
1457 return -ENOMEM;
1458
1459 /* No partial writes. */
1460 if (*ppos != 0)
1461 return -EINVAL;
1462
1463 page = memdup_user_nul(buf, count);
1464 if (IS_ERR(page))
1465 return PTR_ERR(page);
1466
1467 ret = -EINVAL;
1468 if (sscanf(page, "%u", &new_value) != 1)
1469 goto out;
1470
1471 avc_set_cache_threshold(state->avc, new_value);
1472
1473 ret = count;
1474out:
1475 kfree(page);
1476 return ret;
1477}
1478
1479static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1480 size_t count, loff_t *ppos)
1481{
1482 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1483 struct selinux_state *state = fsi->state;
1484 char *page;
1485 ssize_t length;
1486
1487 page = (char *)__get_free_page(GFP_KERNEL);
1488 if (!page)
1489 return -ENOMEM;
1490
1491 length = avc_get_hash_stats(state->avc, page);
1492 if (length >= 0)
1493 length = simple_read_from_buffer(buf, count, ppos, page, length);
1494 free_page((unsigned long)page);
1495
1496 return length;
1497}
1498
1499static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1500 size_t count, loff_t *ppos)
1501{
1502 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1503 struct selinux_state *state = fsi->state;
1504 char *page;
1505 ssize_t length;
1506
1507 page = (char *)__get_free_page(GFP_KERNEL);
1508 if (!page)
1509 return -ENOMEM;
1510
1511 length = security_sidtab_hash_stats(state, page);
1512 if (length >= 0)
1513 length = simple_read_from_buffer(buf, count, ppos, page,
1514 length);
1515 free_page((unsigned long)page);
1516
1517 return length;
1518}
1519
1520static const struct file_operations sel_sidtab_hash_stats_ops = {
1521 .read = sel_read_sidtab_hash_stats,
1522 .llseek = generic_file_llseek,
1523};
1524
1525static const struct file_operations sel_avc_cache_threshold_ops = {
1526 .read = sel_read_avc_cache_threshold,
1527 .write = sel_write_avc_cache_threshold,
1528 .llseek = generic_file_llseek,
1529};
1530
1531static const struct file_operations sel_avc_hash_stats_ops = {
1532 .read = sel_read_avc_hash_stats,
1533 .llseek = generic_file_llseek,
1534};
1535
1536#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1537static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1538{
1539 int cpu;
1540
1541 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1542 if (!cpu_possible(cpu))
1543 continue;
1544 *idx = cpu + 1;
1545 return &per_cpu(avc_cache_stats, cpu);
1546 }
1547 (*idx)++;
1548 return NULL;
1549}
1550
1551static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1552{
1553 loff_t n = *pos - 1;
1554
1555 if (*pos == 0)
1556 return SEQ_START_TOKEN;
1557
1558 return sel_avc_get_stat_idx(&n);
1559}
1560
1561static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1562{
1563 return sel_avc_get_stat_idx(pos);
1564}
1565
1566static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1567{
1568 struct avc_cache_stats *st = v;
1569
1570 if (v == SEQ_START_TOKEN) {
1571 seq_puts(seq,
1572 "lookups hits misses allocations reclaims frees\n");
1573 } else {
1574 unsigned int lookups = st->lookups;
1575 unsigned int misses = st->misses;
1576 unsigned int hits = lookups - misses;
1577 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1578 hits, misses, st->allocations,
1579 st->reclaims, st->frees);
1580 }
1581 return 0;
1582}
1583
1584static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1585{ }
1586
1587static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1588 .start = sel_avc_stats_seq_start,
1589 .next = sel_avc_stats_seq_next,
1590 .show = sel_avc_stats_seq_show,
1591 .stop = sel_avc_stats_seq_stop,
1592};
1593
1594static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1595{
1596 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1597}
1598
1599static const struct file_operations sel_avc_cache_stats_ops = {
1600 .open = sel_open_avc_cache_stats,
1601 .read = seq_read,
1602 .llseek = seq_lseek,
1603 .release = seq_release,
1604};
1605#endif
1606
1607static int sel_make_avc_files(struct dentry *dir)
1608{
1609 struct super_block *sb = dir->d_sb;
1610 struct selinux_fs_info *fsi = sb->s_fs_info;
1611 int i;
1612 static const struct tree_descr files[] = {
1613 { "cache_threshold",
1614 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1615 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1616#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1617 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1618#endif
1619 };
1620
1621 for (i = 0; i < ARRAY_SIZE(files); i++) {
1622 struct inode *inode;
1623 struct dentry *dentry;
1624
1625 dentry = d_alloc_name(dir, files[i].name);
1626 if (!dentry)
1627 return -ENOMEM;
1628
1629 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1630 if (!inode) {
1631 dput(dentry);
1632 return -ENOMEM;
1633 }
1634
1635 inode->i_fop = files[i].ops;
1636 inode->i_ino = ++fsi->last_ino;
1637 d_add(dentry, inode);
1638 }
1639
1640 return 0;
1641}
1642
1643static int sel_make_ss_files(struct dentry *dir)
1644{
1645 struct super_block *sb = dir->d_sb;
1646 struct selinux_fs_info *fsi = sb->s_fs_info;
1647 int i;
1648 static struct tree_descr files[] = {
1649 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1650 };
1651
1652 for (i = 0; i < ARRAY_SIZE(files); i++) {
1653 struct inode *inode;
1654 struct dentry *dentry;
1655
1656 dentry = d_alloc_name(dir, files[i].name);
1657 if (!dentry)
1658 return -ENOMEM;
1659
1660 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1661 if (!inode) {
1662 dput(dentry);
1663 return -ENOMEM;
1664 }
1665
1666 inode->i_fop = files[i].ops;
1667 inode->i_ino = ++fsi->last_ino;
1668 d_add(dentry, inode);
1669 }
1670
1671 return 0;
1672}
1673
1674static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1675 size_t count, loff_t *ppos)
1676{
1677 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1678 char *con;
1679 u32 sid, len;
1680 ssize_t ret;
1681
1682 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1683 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1684 if (ret)
1685 return ret;
1686
1687 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1688 kfree(con);
1689 return ret;
1690}
1691
1692static const struct file_operations sel_initcon_ops = {
1693 .read = sel_read_initcon,
1694 .llseek = generic_file_llseek,
1695};
1696
1697static int sel_make_initcon_files(struct dentry *dir)
1698{
1699 int i;
1700
1701 for (i = 1; i <= SECINITSID_NUM; i++) {
1702 struct inode *inode;
1703 struct dentry *dentry;
1704 const char *s = security_get_initial_sid_context(i);
1705
1706 if (!s)
1707 continue;
1708 dentry = d_alloc_name(dir, s);
1709 if (!dentry)
1710 return -ENOMEM;
1711
1712 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1713 if (!inode) {
1714 dput(dentry);
1715 return -ENOMEM;
1716 }
1717
1718 inode->i_fop = &sel_initcon_ops;
1719 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1720 d_add(dentry, inode);
1721 }
1722
1723 return 0;
1724}
1725
1726static inline unsigned long sel_class_to_ino(u16 class)
1727{
1728 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1729}
1730
1731static inline u16 sel_ino_to_class(unsigned long ino)
1732{
1733 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1734}
1735
1736static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1737{
1738 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1739}
1740
1741static inline u32 sel_ino_to_perm(unsigned long ino)
1742{
1743 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1744}
1745
1746static ssize_t sel_read_class(struct file *file, char __user *buf,
1747 size_t count, loff_t *ppos)
1748{
1749 unsigned long ino = file_inode(file)->i_ino;
1750 char res[TMPBUFLEN];
1751 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1752 return simple_read_from_buffer(buf, count, ppos, res, len);
1753}
1754
1755static const struct file_operations sel_class_ops = {
1756 .read = sel_read_class,
1757 .llseek = generic_file_llseek,
1758};
1759
1760static ssize_t sel_read_perm(struct file *file, char __user *buf,
1761 size_t count, loff_t *ppos)
1762{
1763 unsigned long ino = file_inode(file)->i_ino;
1764 char res[TMPBUFLEN];
1765 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1766 return simple_read_from_buffer(buf, count, ppos, res, len);
1767}
1768
1769static const struct file_operations sel_perm_ops = {
1770 .read = sel_read_perm,
1771 .llseek = generic_file_llseek,
1772};
1773
1774static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1775 size_t count, loff_t *ppos)
1776{
1777 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1778 int value;
1779 char tmpbuf[TMPBUFLEN];
1780 ssize_t length;
1781 unsigned long i_ino = file_inode(file)->i_ino;
1782
1783 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1784 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1785
1786 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1787}
1788
1789static const struct file_operations sel_policycap_ops = {
1790 .read = sel_read_policycap,
1791 .llseek = generic_file_llseek,
1792};
1793
1794static int sel_make_perm_files(char *objclass, int classvalue,
1795 struct dentry *dir)
1796{
1797 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1798 int i, rc, nperms;
1799 char **perms;
1800
1801 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1802 if (rc)
1803 return rc;
1804
1805 for (i = 0; i < nperms; i++) {
1806 struct inode *inode;
1807 struct dentry *dentry;
1808
1809 rc = -ENOMEM;
1810 dentry = d_alloc_name(dir, perms[i]);
1811 if (!dentry)
1812 goto out;
1813
1814 rc = -ENOMEM;
1815 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1816 if (!inode) {
1817 dput(dentry);
1818 goto out;
1819 }
1820
1821 inode->i_fop = &sel_perm_ops;
1822 /* i+1 since perm values are 1-indexed */
1823 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1824 d_add(dentry, inode);
1825 }
1826 rc = 0;
1827out:
1828 for (i = 0; i < nperms; i++)
1829 kfree(perms[i]);
1830 kfree(perms);
1831 return rc;
1832}
1833
1834static int sel_make_class_dir_entries(char *classname, int index,
1835 struct dentry *dir)
1836{
1837 struct super_block *sb = dir->d_sb;
1838 struct selinux_fs_info *fsi = sb->s_fs_info;
1839 struct dentry *dentry = NULL;
1840 struct inode *inode = NULL;
1841 int rc;
1842
1843 dentry = d_alloc_name(dir, "index");
1844 if (!dentry)
1845 return -ENOMEM;
1846
1847 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1848 if (!inode) {
1849 dput(dentry);
1850 return -ENOMEM;
1851 }
1852
1853 inode->i_fop = &sel_class_ops;
1854 inode->i_ino = sel_class_to_ino(index);
1855 d_add(dentry, inode);
1856
1857 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1858 if (IS_ERR(dentry))
1859 return PTR_ERR(dentry);
1860
1861 rc = sel_make_perm_files(classname, index, dentry);
1862
1863 return rc;
1864}
1865
1866static int sel_make_classes(struct selinux_fs_info *fsi)
1867{
1868
1869 int rc, nclasses, i;
1870 char **classes;
1871
1872 /* delete any existing entries */
1873 sel_remove_entries(fsi->class_dir);
1874
1875 rc = security_get_classes(fsi->state, &classes, &nclasses);
1876 if (rc)
1877 return rc;
1878
1879 /* +2 since classes are 1-indexed */
1880 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1881
1882 for (i = 0; i < nclasses; i++) {
1883 struct dentry *class_name_dir;
1884
1885 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1886 &fsi->last_class_ino);
1887 if (IS_ERR(class_name_dir)) {
1888 rc = PTR_ERR(class_name_dir);
1889 goto out;
1890 }
1891
1892 /* i+1 since class values are 1-indexed */
1893 rc = sel_make_class_dir_entries(classes[i], i + 1,
1894 class_name_dir);
1895 if (rc)
1896 goto out;
1897 }
1898 rc = 0;
1899out:
1900 for (i = 0; i < nclasses; i++)
1901 kfree(classes[i]);
1902 kfree(classes);
1903 return rc;
1904}
1905
1906static int sel_make_policycap(struct selinux_fs_info *fsi)
1907{
1908 unsigned int iter;
1909 struct dentry *dentry = NULL;
1910 struct inode *inode = NULL;
1911
1912 sel_remove_entries(fsi->policycap_dir);
1913
1914 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1915 if (iter < ARRAY_SIZE(selinux_policycap_names))
1916 dentry = d_alloc_name(fsi->policycap_dir,
1917 selinux_policycap_names[iter]);
1918 else
1919 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1920
1921 if (dentry == NULL)
1922 return -ENOMEM;
1923
1924 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1925 if (inode == NULL) {
1926 dput(dentry);
1927 return -ENOMEM;
1928 }
1929
1930 inode->i_fop = &sel_policycap_ops;
1931 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1932 d_add(dentry, inode);
1933 }
1934
1935 return 0;
1936}
1937
1938static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1939 unsigned long *ino)
1940{
1941 struct dentry *dentry = d_alloc_name(dir, name);
1942 struct inode *inode;
1943
1944 if (!dentry)
1945 return ERR_PTR(-ENOMEM);
1946
1947 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1948 if (!inode) {
1949 dput(dentry);
1950 return ERR_PTR(-ENOMEM);
1951 }
1952
1953 inode->i_op = &simple_dir_inode_operations;
1954 inode->i_fop = &simple_dir_operations;
1955 inode->i_ino = ++(*ino);
1956 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1957 inc_nlink(inode);
1958 d_add(dentry, inode);
1959 /* bump link count on parent directory, too */
1960 inc_nlink(d_inode(dir));
1961
1962 return dentry;
1963}
1964
1965#define NULL_FILE_NAME "null"
1966
1967static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1968{
1969 struct selinux_fs_info *fsi;
1970 int ret;
1971 struct dentry *dentry;
1972 struct inode *inode;
1973 struct inode_security_struct *isec;
1974
1975 static const struct tree_descr selinux_files[] = {
1976 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1977 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1978 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1979 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1980 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1981 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1982 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1983 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1984 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1985 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1986 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1987 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1988 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1989 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1990 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1991 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1992 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1993 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1994 S_IWUGO},
1995 /* last one */ {""}
1996 };
1997
1998 ret = selinux_fs_info_create(sb);
1999 if (ret)
2000 goto err;
2001
2002 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2003 if (ret)
2004 goto err;
2005
2006 fsi = sb->s_fs_info;
2007 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2008 if (IS_ERR(fsi->bool_dir)) {
2009 ret = PTR_ERR(fsi->bool_dir);
2010 fsi->bool_dir = NULL;
2011 goto err;
2012 }
2013
2014 ret = -ENOMEM;
2015 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2016 if (!dentry)
2017 goto err;
2018
2019 ret = -ENOMEM;
2020 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2021 if (!inode) {
2022 dput(dentry);
2023 goto err;
2024 }
2025
2026 inode->i_ino = ++fsi->last_ino;
2027 isec = selinux_inode(inode);
2028 isec->sid = SECINITSID_DEVNULL;
2029 isec->sclass = SECCLASS_CHR_FILE;
2030 isec->initialized = LABEL_INITIALIZED;
2031
2032 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2033 d_add(dentry, inode);
2034
2035 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2036 if (IS_ERR(dentry)) {
2037 ret = PTR_ERR(dentry);
2038 goto err;
2039 }
2040
2041 ret = sel_make_avc_files(dentry);
2042
2043 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2044 if (IS_ERR(dentry)) {
2045 ret = PTR_ERR(dentry);
2046 goto err;
2047 }
2048
2049 ret = sel_make_ss_files(dentry);
2050 if (ret)
2051 goto err;
2052
2053 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2054 if (IS_ERR(dentry)) {
2055 ret = PTR_ERR(dentry);
2056 goto err;
2057 }
2058
2059 ret = sel_make_initcon_files(dentry);
2060 if (ret)
2061 goto err;
2062
2063 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2064 if (IS_ERR(fsi->class_dir)) {
2065 ret = PTR_ERR(fsi->class_dir);
2066 fsi->class_dir = NULL;
2067 goto err;
2068 }
2069
2070 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2071 &fsi->last_ino);
2072 if (IS_ERR(fsi->policycap_dir)) {
2073 ret = PTR_ERR(fsi->policycap_dir);
2074 fsi->policycap_dir = NULL;
2075 goto err;
2076 }
2077
2078 ret = sel_make_policy_nodes(fsi);
2079 if (ret)
2080 goto err;
2081 return 0;
2082err:
2083 pr_err("SELinux: %s: failed while creating inodes\n",
2084 __func__);
2085
2086 selinux_fs_info_free(sb);
2087
2088 return ret;
2089}
2090
2091static int sel_get_tree(struct fs_context *fc)
2092{
2093 return get_tree_single(fc, sel_fill_super);
2094}
2095
2096static const struct fs_context_operations sel_context_ops = {
2097 .get_tree = sel_get_tree,
2098};
2099
2100static int sel_init_fs_context(struct fs_context *fc)
2101{
2102 fc->ops = &sel_context_ops;
2103 return 0;
2104}
2105
2106static void sel_kill_sb(struct super_block *sb)
2107{
2108 selinux_fs_info_free(sb);
2109 kill_litter_super(sb);
2110}
2111
2112static struct file_system_type sel_fs_type = {
2113 .name = "selinuxfs",
2114 .init_fs_context = sel_init_fs_context,
2115 .kill_sb = sel_kill_sb,
2116};
2117
2118struct vfsmount *selinuxfs_mount;
2119struct path selinux_null;
2120
2121static int __init init_sel_fs(void)
2122{
2123 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2124 sizeof(NULL_FILE_NAME)-1);
2125 int err;
2126
2127 if (!selinux_enabled_boot)
2128 return 0;
2129
2130 err = sysfs_create_mount_point(fs_kobj, "selinux");
2131 if (err)
2132 return err;
2133
2134 err = register_filesystem(&sel_fs_type);
2135 if (err) {
2136 sysfs_remove_mount_point(fs_kobj, "selinux");
2137 return err;
2138 }
2139
2140 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2141 if (IS_ERR(selinuxfs_mount)) {
2142 pr_err("selinuxfs: could not mount!\n");
2143 err = PTR_ERR(selinuxfs_mount);
2144 selinuxfs_mount = NULL;
2145 }
2146 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2147 &null_name);
2148 if (IS_ERR(selinux_null.dentry)) {
2149 pr_err("selinuxfs: could not lookup null!\n");
2150 err = PTR_ERR(selinux_null.dentry);
2151 selinux_null.dentry = NULL;
2152 }
2153
2154 return err;
2155}
2156
2157__initcall(init_sel_fs);
2158
2159#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2160void exit_sel_fs(void)
2161{
2162 sysfs_remove_mount_point(fs_kobj, "selinux");
2163 dput(selinux_null.dentry);
2164 kern_unmount(selinuxfs_mount);
2165 unregister_filesystem(&sel_fs_type);
2166}
2167#endif