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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/namei.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/security.h>
27#include <linux/major.h>
28#include <linux/seq_file.h>
29#include <linux/percpu.h>
30#include <linux/audit.h>
31#include <linux/uaccess.h>
32#include <linux/kobject.h>
33#include <linux/ctype.h>
34
35/* selinuxfs pseudo filesystem for exporting the security policy API.
36 Based on the proc code and the fs/nfsd/nfsctl.c code. */
37
38#include "flask.h"
39#include "avc.h"
40#include "avc_ss.h"
41#include "security.h"
42#include "objsec.h"
43#include "conditional.h"
44#include "ima.h"
45
46enum sel_inos {
47 SEL_ROOT_INO = 2,
48 SEL_LOAD, /* load policy */
49 SEL_ENFORCE, /* get or set enforcing status */
50 SEL_CONTEXT, /* validate context */
51 SEL_ACCESS, /* compute access decision */
52 SEL_CREATE, /* compute create labeling decision */
53 SEL_RELABEL, /* compute relabeling decision */
54 SEL_USER, /* compute reachable user contexts */
55 SEL_POLICYVERS, /* return policy version for this kernel */
56 SEL_COMMIT_BOOLS, /* commit new boolean values */
57 SEL_MLS, /* return if MLS policy is enabled */
58 SEL_DISABLE, /* disable SELinux until next reboot */
59 SEL_MEMBER, /* compute polyinstantiation membership decision */
60 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
61 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
62 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
63 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
64 SEL_STATUS, /* export current status using mmap() */
65 SEL_POLICY, /* allow userspace to read the in kernel policy */
66 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
67 SEL_INO_NEXT, /* The next inode number to use */
68};
69
70struct selinux_fs_info {
71 struct dentry *bool_dir;
72 unsigned int bool_num;
73 char **bool_pending_names;
74 int *bool_pending_values;
75 struct dentry *class_dir;
76 unsigned long last_class_ino;
77 bool policy_opened;
78 struct dentry *policycap_dir;
79 unsigned long last_ino;
80 struct selinux_state *state;
81 struct super_block *sb;
82};
83
84static int selinux_fs_info_create(struct super_block *sb)
85{
86 struct selinux_fs_info *fsi;
87
88 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
89 if (!fsi)
90 return -ENOMEM;
91
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 BOOL_DIR_NAME "booleans"
121#define CLASS_DIR_NAME "class"
122#define POLICYCAP_DIR_NAME "policy_capabilities"
123
124#define TMPBUFLEN 12
125static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
126 size_t count, loff_t *ppos)
127{
128 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
129 char tmpbuf[TMPBUFLEN];
130 ssize_t length;
131
132 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
133 enforcing_enabled(fsi->state));
134 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
135}
136
137#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
138static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
139 size_t count, loff_t *ppos)
140
141{
142 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
143 struct selinux_state *state = fsi->state;
144 char *page = NULL;
145 ssize_t length;
146 int old_value, new_value;
147
148 if (count >= PAGE_SIZE)
149 return -ENOMEM;
150
151 /* No partial writes. */
152 if (*ppos != 0)
153 return -EINVAL;
154
155 page = memdup_user_nul(buf, count);
156 if (IS_ERR(page))
157 return PTR_ERR(page);
158
159 length = -EINVAL;
160 if (sscanf(page, "%d", &new_value) != 1)
161 goto out;
162
163 new_value = !!new_value;
164
165 old_value = enforcing_enabled(state);
166 if (new_value != old_value) {
167 length = avc_has_perm(&selinux_state,
168 current_sid(), SECINITSID_SECURITY,
169 SECCLASS_SECURITY, SECURITY__SETENFORCE,
170 NULL);
171 if (length)
172 goto out;
173 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
174 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
175 " enabled=1 old-enabled=1 lsm=selinux res=1",
176 new_value, old_value,
177 from_kuid(&init_user_ns, audit_get_loginuid(current)),
178 audit_get_sessionid(current));
179 enforcing_set(state, new_value);
180 if (new_value)
181 avc_ss_reset(state->avc, 0);
182 selnl_notify_setenforce(new_value);
183 selinux_status_update_setenforce(state, new_value);
184 if (!new_value)
185 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
186
187 selinux_ima_measure_state(state);
188 }
189 length = count;
190out:
191 kfree(page);
192 return length;
193}
194#else
195#define sel_write_enforce NULL
196#endif
197
198static const struct file_operations sel_enforce_ops = {
199 .read = sel_read_enforce,
200 .write = sel_write_enforce,
201 .llseek = generic_file_llseek,
202};
203
204static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
205 size_t count, loff_t *ppos)
206{
207 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
208 struct selinux_state *state = fsi->state;
209 char tmpbuf[TMPBUFLEN];
210 ssize_t length;
211 ino_t ino = file_inode(filp)->i_ino;
212 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
213 security_get_reject_unknown(state) :
214 !security_get_allow_unknown(state);
215
216 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
217 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
218}
219
220static const struct file_operations sel_handle_unknown_ops = {
221 .read = sel_read_handle_unknown,
222 .llseek = generic_file_llseek,
223};
224
225static int sel_open_handle_status(struct inode *inode, struct file *filp)
226{
227 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
228 struct page *status = selinux_kernel_status_page(fsi->state);
229
230 if (!status)
231 return -ENOMEM;
232
233 filp->private_data = status;
234
235 return 0;
236}
237
238static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
239 size_t count, loff_t *ppos)
240{
241 struct page *status = filp->private_data;
242
243 BUG_ON(!status);
244
245 return simple_read_from_buffer(buf, count, ppos,
246 page_address(status),
247 sizeof(struct selinux_kernel_status));
248}
249
250static int sel_mmap_handle_status(struct file *filp,
251 struct vm_area_struct *vma)
252{
253 struct page *status = filp->private_data;
254 unsigned long size = vma->vm_end - vma->vm_start;
255
256 BUG_ON(!status);
257
258 /* only allows one page from the head */
259 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
260 return -EIO;
261 /* disallow writable mapping */
262 if (vma->vm_flags & VM_WRITE)
263 return -EPERM;
264 /* disallow mprotect() turns it into writable */
265 vma->vm_flags &= ~VM_MAYWRITE;
266
267 return remap_pfn_range(vma, vma->vm_start,
268 page_to_pfn(status),
269 size, vma->vm_page_prot);
270}
271
272static const struct file_operations sel_handle_status_ops = {
273 .open = sel_open_handle_status,
274 .read = sel_read_handle_status,
275 .mmap = sel_mmap_handle_status,
276 .llseek = generic_file_llseek,
277};
278
279#ifdef CONFIG_SECURITY_SELINUX_DISABLE
280static ssize_t sel_write_disable(struct file *file, const char __user *buf,
281 size_t count, loff_t *ppos)
282
283{
284 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
285 char *page;
286 ssize_t length;
287 int new_value;
288 int enforcing;
289
290 /* NOTE: we are now officially considering runtime disable as
291 * deprecated, and using it will become increasingly painful
292 * (e.g. sleeping/blocking) as we progress through future
293 * kernel releases until eventually it is removed
294 */
295 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
296 pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
297 ssleep(15);
298
299 if (count >= PAGE_SIZE)
300 return -ENOMEM;
301
302 /* No partial writes. */
303 if (*ppos != 0)
304 return -EINVAL;
305
306 page = memdup_user_nul(buf, count);
307 if (IS_ERR(page))
308 return PTR_ERR(page);
309
310 length = -EINVAL;
311 if (sscanf(page, "%d", &new_value) != 1)
312 goto out;
313
314 if (new_value) {
315 enforcing = enforcing_enabled(fsi->state);
316 length = selinux_disable(fsi->state);
317 if (length)
318 goto out;
319 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
320 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
321 " enabled=0 old-enabled=1 lsm=selinux res=1",
322 enforcing, enforcing,
323 from_kuid(&init_user_ns, audit_get_loginuid(current)),
324 audit_get_sessionid(current));
325 }
326
327 length = count;
328out:
329 kfree(page);
330 return length;
331}
332#else
333#define sel_write_disable NULL
334#endif
335
336static const struct file_operations sel_disable_ops = {
337 .write = sel_write_disable,
338 .llseek = generic_file_llseek,
339};
340
341static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
342 size_t count, loff_t *ppos)
343{
344 char tmpbuf[TMPBUFLEN];
345 ssize_t length;
346
347 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
348 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
349}
350
351static const struct file_operations sel_policyvers_ops = {
352 .read = sel_read_policyvers,
353 .llseek = generic_file_llseek,
354};
355
356/* declaration for sel_write_load */
357static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
358 unsigned int *bool_num, char ***bool_pending_names,
359 int **bool_pending_values);
360static int sel_make_classes(struct selinux_policy *newpolicy,
361 struct dentry *class_dir,
362 unsigned long *last_class_ino);
363
364/* declaration for sel_make_class_dirs */
365static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
366 unsigned long *ino);
367
368/* declaration for sel_make_policy_nodes */
369static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
370 unsigned long *ino);
371
372/* declaration for sel_make_policy_nodes */
373static void sel_remove_entries(struct dentry *de);
374
375static ssize_t sel_read_mls(struct file *filp, char __user *buf,
376 size_t count, loff_t *ppos)
377{
378 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
379 char tmpbuf[TMPBUFLEN];
380 ssize_t length;
381
382 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
383 security_mls_enabled(fsi->state));
384 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
385}
386
387static const struct file_operations sel_mls_ops = {
388 .read = sel_read_mls,
389 .llseek = generic_file_llseek,
390};
391
392struct policy_load_memory {
393 size_t len;
394 void *data;
395};
396
397static int sel_open_policy(struct inode *inode, struct file *filp)
398{
399 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
400 struct selinux_state *state = fsi->state;
401 struct policy_load_memory *plm = NULL;
402 int rc;
403
404 BUG_ON(filp->private_data);
405
406 mutex_lock(&fsi->state->policy_mutex);
407
408 rc = avc_has_perm(&selinux_state,
409 current_sid(), SECINITSID_SECURITY,
410 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
411 if (rc)
412 goto err;
413
414 rc = -EBUSY;
415 if (fsi->policy_opened)
416 goto err;
417
418 rc = -ENOMEM;
419 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
420 if (!plm)
421 goto err;
422
423 rc = security_read_policy(state, &plm->data, &plm->len);
424 if (rc)
425 goto err;
426
427 if ((size_t)i_size_read(inode) != plm->len) {
428 inode_lock(inode);
429 i_size_write(inode, plm->len);
430 inode_unlock(inode);
431 }
432
433 fsi->policy_opened = 1;
434
435 filp->private_data = plm;
436
437 mutex_unlock(&fsi->state->policy_mutex);
438
439 return 0;
440err:
441 mutex_unlock(&fsi->state->policy_mutex);
442
443 if (plm)
444 vfree(plm->data);
445 kfree(plm);
446 return rc;
447}
448
449static int sel_release_policy(struct inode *inode, struct file *filp)
450{
451 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
452 struct policy_load_memory *plm = filp->private_data;
453
454 BUG_ON(!plm);
455
456 fsi->policy_opened = 0;
457
458 vfree(plm->data);
459 kfree(plm);
460
461 return 0;
462}
463
464static ssize_t sel_read_policy(struct file *filp, char __user *buf,
465 size_t count, loff_t *ppos)
466{
467 struct policy_load_memory *plm = filp->private_data;
468 int ret;
469
470 ret = avc_has_perm(&selinux_state,
471 current_sid(), SECINITSID_SECURITY,
472 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
473 if (ret)
474 return ret;
475
476 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
477}
478
479static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
480{
481 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
482 unsigned long offset;
483 struct page *page;
484
485 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
486 return VM_FAULT_SIGBUS;
487
488 offset = vmf->pgoff << PAGE_SHIFT;
489 if (offset >= roundup(plm->len, PAGE_SIZE))
490 return VM_FAULT_SIGBUS;
491
492 page = vmalloc_to_page(plm->data + offset);
493 get_page(page);
494
495 vmf->page = page;
496
497 return 0;
498}
499
500static const struct vm_operations_struct sel_mmap_policy_ops = {
501 .fault = sel_mmap_policy_fault,
502 .page_mkwrite = sel_mmap_policy_fault,
503};
504
505static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
506{
507 if (vma->vm_flags & VM_SHARED) {
508 /* do not allow mprotect to make mapping writable */
509 vma->vm_flags &= ~VM_MAYWRITE;
510
511 if (vma->vm_flags & VM_WRITE)
512 return -EACCES;
513 }
514
515 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
516 vma->vm_ops = &sel_mmap_policy_ops;
517
518 return 0;
519}
520
521static const struct file_operations sel_policy_ops = {
522 .open = sel_open_policy,
523 .read = sel_read_policy,
524 .mmap = sel_mmap_policy,
525 .release = sel_release_policy,
526 .llseek = generic_file_llseek,
527};
528
529static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
530 int *bool_values)
531{
532 u32 i;
533
534 /* bool_dir cleanup */
535 for (i = 0; i < bool_num; i++)
536 kfree(bool_names[i]);
537 kfree(bool_names);
538 kfree(bool_values);
539}
540
541static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
542 struct selinux_policy *newpolicy)
543{
544 int ret = 0;
545 struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
546 unsigned int tmp_bool_num, old_bool_num;
547 char **tmp_bool_names, **old_bool_names;
548 int *tmp_bool_values, *old_bool_values;
549 unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
550
551 tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
552 if (IS_ERR(tmp_parent))
553 return PTR_ERR(tmp_parent);
554
555 tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
556 tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
557 if (IS_ERR(tmp_bool_dir)) {
558 ret = PTR_ERR(tmp_bool_dir);
559 goto out;
560 }
561
562 tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
563 tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
564 if (IS_ERR(tmp_class_dir)) {
565 ret = PTR_ERR(tmp_class_dir);
566 goto out;
567 }
568
569 ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
570 &tmp_bool_names, &tmp_bool_values);
571 if (ret)
572 goto out;
573
574 ret = sel_make_classes(newpolicy, tmp_class_dir,
575 &fsi->last_class_ino);
576 if (ret)
577 goto out;
578
579 /* booleans */
580 old_dentry = fsi->bool_dir;
581 lock_rename(tmp_bool_dir, old_dentry);
582 d_exchange(tmp_bool_dir, fsi->bool_dir);
583
584 old_bool_num = fsi->bool_num;
585 old_bool_names = fsi->bool_pending_names;
586 old_bool_values = fsi->bool_pending_values;
587
588 fsi->bool_num = tmp_bool_num;
589 fsi->bool_pending_names = tmp_bool_names;
590 fsi->bool_pending_values = tmp_bool_values;
591
592 sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
593
594 fsi->bool_dir = tmp_bool_dir;
595 unlock_rename(tmp_bool_dir, old_dentry);
596
597 /* classes */
598 old_dentry = fsi->class_dir;
599 lock_rename(tmp_class_dir, old_dentry);
600 d_exchange(tmp_class_dir, fsi->class_dir);
601 fsi->class_dir = tmp_class_dir;
602 unlock_rename(tmp_class_dir, old_dentry);
603
604out:
605 /* Since the other temporary dirs are children of tmp_parent
606 * this will handle all the cleanup in the case of a failure before
607 * the swapover
608 */
609 sel_remove_entries(tmp_parent);
610 dput(tmp_parent); /* d_genocide() only handles the children */
611
612 return ret;
613}
614
615static ssize_t sel_write_load(struct file *file, const char __user *buf,
616 size_t count, loff_t *ppos)
617
618{
619 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
620 struct selinux_load_state load_state;
621 ssize_t length;
622 void *data = NULL;
623
624 mutex_lock(&fsi->state->policy_mutex);
625
626 length = avc_has_perm(&selinux_state,
627 current_sid(), SECINITSID_SECURITY,
628 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
629 if (length)
630 goto out;
631
632 /* No partial writes. */
633 length = -EINVAL;
634 if (*ppos != 0)
635 goto out;
636
637 length = -ENOMEM;
638 data = vmalloc(count);
639 if (!data)
640 goto out;
641
642 length = -EFAULT;
643 if (copy_from_user(data, buf, count) != 0)
644 goto out;
645
646 length = security_load_policy(fsi->state, data, count, &load_state);
647 if (length) {
648 pr_warn_ratelimited("SELinux: failed to load policy\n");
649 goto out;
650 }
651
652 length = sel_make_policy_nodes(fsi, load_state.policy);
653 if (length) {
654 pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
655 selinux_policy_cancel(fsi->state, &load_state);
656 goto out;
657 }
658
659 selinux_policy_commit(fsi->state, &load_state);
660
661 length = count;
662
663 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
664 "auid=%u ses=%u lsm=selinux res=1",
665 from_kuid(&init_user_ns, audit_get_loginuid(current)),
666 audit_get_sessionid(current));
667out:
668 mutex_unlock(&fsi->state->policy_mutex);
669 vfree(data);
670 return length;
671}
672
673static const struct file_operations sel_load_ops = {
674 .write = sel_write_load,
675 .llseek = generic_file_llseek,
676};
677
678static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
679{
680 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
681 struct selinux_state *state = fsi->state;
682 char *canon = NULL;
683 u32 sid, len;
684 ssize_t length;
685
686 length = avc_has_perm(&selinux_state,
687 current_sid(), SECINITSID_SECURITY,
688 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
689 if (length)
690 goto out;
691
692 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
693 if (length)
694 goto out;
695
696 length = security_sid_to_context(state, sid, &canon, &len);
697 if (length)
698 goto out;
699
700 length = -ERANGE;
701 if (len > SIMPLE_TRANSACTION_LIMIT) {
702 pr_err("SELinux: %s: context size (%u) exceeds "
703 "payload max\n", __func__, len);
704 goto out;
705 }
706
707 memcpy(buf, canon, len);
708 length = len;
709out:
710 kfree(canon);
711 return length;
712}
713
714static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
715 size_t count, loff_t *ppos)
716{
717 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
718 char tmpbuf[TMPBUFLEN];
719 ssize_t length;
720
721 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
722 checkreqprot_get(fsi->state));
723 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
724}
725
726static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
727 size_t count, loff_t *ppos)
728{
729 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
730 char *page;
731 ssize_t length;
732 unsigned int new_value;
733
734 length = avc_has_perm(&selinux_state,
735 current_sid(), SECINITSID_SECURITY,
736 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
737 NULL);
738 if (length)
739 return length;
740
741 if (count >= PAGE_SIZE)
742 return -ENOMEM;
743
744 /* No partial writes. */
745 if (*ppos != 0)
746 return -EINVAL;
747
748 page = memdup_user_nul(buf, count);
749 if (IS_ERR(page))
750 return PTR_ERR(page);
751
752 length = -EINVAL;
753 if (sscanf(page, "%u", &new_value) != 1)
754 goto out;
755
756 if (new_value) {
757 char comm[sizeof(current->comm)];
758
759 memcpy(comm, current->comm, sizeof(comm));
760 pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
761 comm, current->pid);
762 }
763
764 checkreqprot_set(fsi->state, (new_value ? 1 : 0));
765 if (new_value)
766 ssleep(15);
767 length = count;
768
769 selinux_ima_measure_state(fsi->state);
770
771out:
772 kfree(page);
773 return length;
774}
775static const struct file_operations sel_checkreqprot_ops = {
776 .read = sel_read_checkreqprot,
777 .write = sel_write_checkreqprot,
778 .llseek = generic_file_llseek,
779};
780
781static ssize_t sel_write_validatetrans(struct file *file,
782 const char __user *buf,
783 size_t count, loff_t *ppos)
784{
785 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
786 struct selinux_state *state = fsi->state;
787 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
788 char *req = NULL;
789 u32 osid, nsid, tsid;
790 u16 tclass;
791 int rc;
792
793 rc = avc_has_perm(&selinux_state,
794 current_sid(), SECINITSID_SECURITY,
795 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
796 if (rc)
797 goto out;
798
799 rc = -ENOMEM;
800 if (count >= PAGE_SIZE)
801 goto out;
802
803 /* No partial writes. */
804 rc = -EINVAL;
805 if (*ppos != 0)
806 goto out;
807
808 req = memdup_user_nul(buf, count);
809 if (IS_ERR(req)) {
810 rc = PTR_ERR(req);
811 req = NULL;
812 goto out;
813 }
814
815 rc = -ENOMEM;
816 oldcon = kzalloc(count + 1, GFP_KERNEL);
817 if (!oldcon)
818 goto out;
819
820 newcon = kzalloc(count + 1, GFP_KERNEL);
821 if (!newcon)
822 goto out;
823
824 taskcon = kzalloc(count + 1, GFP_KERNEL);
825 if (!taskcon)
826 goto out;
827
828 rc = -EINVAL;
829 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
830 goto out;
831
832 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
833 if (rc)
834 goto out;
835
836 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
837 if (rc)
838 goto out;
839
840 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
841 if (rc)
842 goto out;
843
844 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
845 if (!rc)
846 rc = count;
847out:
848 kfree(req);
849 kfree(oldcon);
850 kfree(newcon);
851 kfree(taskcon);
852 return rc;
853}
854
855static const struct file_operations sel_transition_ops = {
856 .write = sel_write_validatetrans,
857 .llseek = generic_file_llseek,
858};
859
860/*
861 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
862 */
863static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
864static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
865static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
866static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
867static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
868
869static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
870 [SEL_ACCESS] = sel_write_access,
871 [SEL_CREATE] = sel_write_create,
872 [SEL_RELABEL] = sel_write_relabel,
873 [SEL_USER] = sel_write_user,
874 [SEL_MEMBER] = sel_write_member,
875 [SEL_CONTEXT] = sel_write_context,
876};
877
878static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
879{
880 ino_t ino = file_inode(file)->i_ino;
881 char *data;
882 ssize_t rv;
883
884 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
885 return -EINVAL;
886
887 data = simple_transaction_get(file, buf, size);
888 if (IS_ERR(data))
889 return PTR_ERR(data);
890
891 rv = write_op[ino](file, data, size);
892 if (rv > 0) {
893 simple_transaction_set(file, rv);
894 rv = size;
895 }
896 return rv;
897}
898
899static const struct file_operations transaction_ops = {
900 .write = selinux_transaction_write,
901 .read = simple_transaction_read,
902 .release = simple_transaction_release,
903 .llseek = generic_file_llseek,
904};
905
906/*
907 * payload - write methods
908 * If the method has a response, the response should be put in buf,
909 * and the length returned. Otherwise return 0 or and -error.
910 */
911
912static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
913{
914 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
915 struct selinux_state *state = fsi->state;
916 char *scon = NULL, *tcon = NULL;
917 u32 ssid, tsid;
918 u16 tclass;
919 struct av_decision avd;
920 ssize_t length;
921
922 length = avc_has_perm(&selinux_state,
923 current_sid(), SECINITSID_SECURITY,
924 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
925 if (length)
926 goto out;
927
928 length = -ENOMEM;
929 scon = kzalloc(size + 1, GFP_KERNEL);
930 if (!scon)
931 goto out;
932
933 length = -ENOMEM;
934 tcon = kzalloc(size + 1, GFP_KERNEL);
935 if (!tcon)
936 goto out;
937
938 length = -EINVAL;
939 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
940 goto out;
941
942 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
943 if (length)
944 goto out;
945
946 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
947 if (length)
948 goto out;
949
950 security_compute_av_user(state, ssid, tsid, tclass, &avd);
951
952 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
953 "%x %x %x %x %u %x",
954 avd.allowed, 0xffffffff,
955 avd.auditallow, avd.auditdeny,
956 avd.seqno, avd.flags);
957out:
958 kfree(tcon);
959 kfree(scon);
960 return length;
961}
962
963static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
964{
965 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
966 struct selinux_state *state = fsi->state;
967 char *scon = NULL, *tcon = NULL;
968 char *namebuf = NULL, *objname = NULL;
969 u32 ssid, tsid, newsid;
970 u16 tclass;
971 ssize_t length;
972 char *newcon = NULL;
973 u32 len;
974 int nargs;
975
976 length = avc_has_perm(&selinux_state,
977 current_sid(), SECINITSID_SECURITY,
978 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
979 NULL);
980 if (length)
981 goto out;
982
983 length = -ENOMEM;
984 scon = kzalloc(size + 1, GFP_KERNEL);
985 if (!scon)
986 goto out;
987
988 length = -ENOMEM;
989 tcon = kzalloc(size + 1, GFP_KERNEL);
990 if (!tcon)
991 goto out;
992
993 length = -ENOMEM;
994 namebuf = kzalloc(size + 1, GFP_KERNEL);
995 if (!namebuf)
996 goto out;
997
998 length = -EINVAL;
999 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
1000 if (nargs < 3 || nargs > 4)
1001 goto out;
1002 if (nargs == 4) {
1003 /*
1004 * If and when the name of new object to be queried contains
1005 * either whitespace or multibyte characters, they shall be
1006 * encoded based on the percentage-encoding rule.
1007 * If not encoded, the sscanf logic picks up only left-half
1008 * of the supplied name; splitted by a whitespace unexpectedly.
1009 */
1010 char *r, *w;
1011 int c1, c2;
1012
1013 r = w = namebuf;
1014 do {
1015 c1 = *r++;
1016 if (c1 == '+')
1017 c1 = ' ';
1018 else if (c1 == '%') {
1019 c1 = hex_to_bin(*r++);
1020 if (c1 < 0)
1021 goto out;
1022 c2 = hex_to_bin(*r++);
1023 if (c2 < 0)
1024 goto out;
1025 c1 = (c1 << 4) | c2;
1026 }
1027 *w++ = c1;
1028 } while (c1 != '\0');
1029
1030 objname = namebuf;
1031 }
1032
1033 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1034 if (length)
1035 goto out;
1036
1037 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1038 if (length)
1039 goto out;
1040
1041 length = security_transition_sid_user(state, ssid, tsid, tclass,
1042 objname, &newsid);
1043 if (length)
1044 goto out;
1045
1046 length = security_sid_to_context(state, newsid, &newcon, &len);
1047 if (length)
1048 goto out;
1049
1050 length = -ERANGE;
1051 if (len > SIMPLE_TRANSACTION_LIMIT) {
1052 pr_err("SELinux: %s: context size (%u) exceeds "
1053 "payload max\n", __func__, len);
1054 goto out;
1055 }
1056
1057 memcpy(buf, newcon, len);
1058 length = len;
1059out:
1060 kfree(newcon);
1061 kfree(namebuf);
1062 kfree(tcon);
1063 kfree(scon);
1064 return length;
1065}
1066
1067static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1068{
1069 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1070 struct selinux_state *state = fsi->state;
1071 char *scon = NULL, *tcon = NULL;
1072 u32 ssid, tsid, newsid;
1073 u16 tclass;
1074 ssize_t length;
1075 char *newcon = NULL;
1076 u32 len;
1077
1078 length = avc_has_perm(&selinux_state,
1079 current_sid(), SECINITSID_SECURITY,
1080 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1081 NULL);
1082 if (length)
1083 goto out;
1084
1085 length = -ENOMEM;
1086 scon = kzalloc(size + 1, GFP_KERNEL);
1087 if (!scon)
1088 goto out;
1089
1090 length = -ENOMEM;
1091 tcon = kzalloc(size + 1, GFP_KERNEL);
1092 if (!tcon)
1093 goto out;
1094
1095 length = -EINVAL;
1096 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1097 goto out;
1098
1099 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1100 if (length)
1101 goto out;
1102
1103 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1104 if (length)
1105 goto out;
1106
1107 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1108 if (length)
1109 goto out;
1110
1111 length = security_sid_to_context(state, newsid, &newcon, &len);
1112 if (length)
1113 goto out;
1114
1115 length = -ERANGE;
1116 if (len > SIMPLE_TRANSACTION_LIMIT)
1117 goto out;
1118
1119 memcpy(buf, newcon, len);
1120 length = len;
1121out:
1122 kfree(newcon);
1123 kfree(tcon);
1124 kfree(scon);
1125 return length;
1126}
1127
1128static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1129{
1130 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1131 struct selinux_state *state = fsi->state;
1132 char *con = NULL, *user = NULL, *ptr;
1133 u32 sid, *sids = NULL;
1134 ssize_t length;
1135 char *newcon;
1136 int i, rc;
1137 u32 len, nsids;
1138
1139 length = avc_has_perm(&selinux_state,
1140 current_sid(), SECINITSID_SECURITY,
1141 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1142 NULL);
1143 if (length)
1144 goto out;
1145
1146 length = -ENOMEM;
1147 con = kzalloc(size + 1, GFP_KERNEL);
1148 if (!con)
1149 goto out;
1150
1151 length = -ENOMEM;
1152 user = kzalloc(size + 1, GFP_KERNEL);
1153 if (!user)
1154 goto out;
1155
1156 length = -EINVAL;
1157 if (sscanf(buf, "%s %s", con, user) != 2)
1158 goto out;
1159
1160 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1161 if (length)
1162 goto out;
1163
1164 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1165 if (length)
1166 goto out;
1167
1168 length = sprintf(buf, "%u", nsids) + 1;
1169 ptr = buf + length;
1170 for (i = 0; i < nsids; i++) {
1171 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1172 if (rc) {
1173 length = rc;
1174 goto out;
1175 }
1176 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1177 kfree(newcon);
1178 length = -ERANGE;
1179 goto out;
1180 }
1181 memcpy(ptr, newcon, len);
1182 kfree(newcon);
1183 ptr += len;
1184 length += len;
1185 }
1186out:
1187 kfree(sids);
1188 kfree(user);
1189 kfree(con);
1190 return length;
1191}
1192
1193static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1194{
1195 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1196 struct selinux_state *state = fsi->state;
1197 char *scon = NULL, *tcon = NULL;
1198 u32 ssid, tsid, newsid;
1199 u16 tclass;
1200 ssize_t length;
1201 char *newcon = NULL;
1202 u32 len;
1203
1204 length = avc_has_perm(&selinux_state,
1205 current_sid(), SECINITSID_SECURITY,
1206 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1207 NULL);
1208 if (length)
1209 goto out;
1210
1211 length = -ENOMEM;
1212 scon = kzalloc(size + 1, GFP_KERNEL);
1213 if (!scon)
1214 goto out;
1215
1216 length = -ENOMEM;
1217 tcon = kzalloc(size + 1, GFP_KERNEL);
1218 if (!tcon)
1219 goto out;
1220
1221 length = -EINVAL;
1222 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1223 goto out;
1224
1225 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1226 if (length)
1227 goto out;
1228
1229 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1230 if (length)
1231 goto out;
1232
1233 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1234 if (length)
1235 goto out;
1236
1237 length = security_sid_to_context(state, newsid, &newcon, &len);
1238 if (length)
1239 goto out;
1240
1241 length = -ERANGE;
1242 if (len > SIMPLE_TRANSACTION_LIMIT) {
1243 pr_err("SELinux: %s: context size (%u) exceeds "
1244 "payload max\n", __func__, len);
1245 goto out;
1246 }
1247
1248 memcpy(buf, newcon, len);
1249 length = len;
1250out:
1251 kfree(newcon);
1252 kfree(tcon);
1253 kfree(scon);
1254 return length;
1255}
1256
1257static struct inode *sel_make_inode(struct super_block *sb, int mode)
1258{
1259 struct inode *ret = new_inode(sb);
1260
1261 if (ret) {
1262 ret->i_mode = mode;
1263 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1264 }
1265 return ret;
1266}
1267
1268static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1269 size_t count, loff_t *ppos)
1270{
1271 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1272 char *page = NULL;
1273 ssize_t length;
1274 ssize_t ret;
1275 int cur_enforcing;
1276 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1277 const char *name = filep->f_path.dentry->d_name.name;
1278
1279 mutex_lock(&fsi->state->policy_mutex);
1280
1281 ret = -EINVAL;
1282 if (index >= fsi->bool_num || strcmp(name,
1283 fsi->bool_pending_names[index]))
1284 goto out_unlock;
1285
1286 ret = -ENOMEM;
1287 page = (char *)get_zeroed_page(GFP_KERNEL);
1288 if (!page)
1289 goto out_unlock;
1290
1291 cur_enforcing = security_get_bool_value(fsi->state, index);
1292 if (cur_enforcing < 0) {
1293 ret = cur_enforcing;
1294 goto out_unlock;
1295 }
1296 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1297 fsi->bool_pending_values[index]);
1298 mutex_unlock(&fsi->state->policy_mutex);
1299 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1300out_free:
1301 free_page((unsigned long)page);
1302 return ret;
1303
1304out_unlock:
1305 mutex_unlock(&fsi->state->policy_mutex);
1306 goto out_free;
1307}
1308
1309static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1310 size_t count, loff_t *ppos)
1311{
1312 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1313 char *page = NULL;
1314 ssize_t length;
1315 int new_value;
1316 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1317 const char *name = filep->f_path.dentry->d_name.name;
1318
1319 if (count >= PAGE_SIZE)
1320 return -ENOMEM;
1321
1322 /* No partial writes. */
1323 if (*ppos != 0)
1324 return -EINVAL;
1325
1326 page = memdup_user_nul(buf, count);
1327 if (IS_ERR(page))
1328 return PTR_ERR(page);
1329
1330 mutex_lock(&fsi->state->policy_mutex);
1331
1332 length = avc_has_perm(&selinux_state,
1333 current_sid(), SECINITSID_SECURITY,
1334 SECCLASS_SECURITY, SECURITY__SETBOOL,
1335 NULL);
1336 if (length)
1337 goto out;
1338
1339 length = -EINVAL;
1340 if (index >= fsi->bool_num || strcmp(name,
1341 fsi->bool_pending_names[index]))
1342 goto out;
1343
1344 length = -EINVAL;
1345 if (sscanf(page, "%d", &new_value) != 1)
1346 goto out;
1347
1348 if (new_value)
1349 new_value = 1;
1350
1351 fsi->bool_pending_values[index] = new_value;
1352 length = count;
1353
1354out:
1355 mutex_unlock(&fsi->state->policy_mutex);
1356 kfree(page);
1357 return length;
1358}
1359
1360static const struct file_operations sel_bool_ops = {
1361 .read = sel_read_bool,
1362 .write = sel_write_bool,
1363 .llseek = generic_file_llseek,
1364};
1365
1366static ssize_t sel_commit_bools_write(struct file *filep,
1367 const char __user *buf,
1368 size_t count, loff_t *ppos)
1369{
1370 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1371 char *page = NULL;
1372 ssize_t length;
1373 int new_value;
1374
1375 if (count >= PAGE_SIZE)
1376 return -ENOMEM;
1377
1378 /* No partial writes. */
1379 if (*ppos != 0)
1380 return -EINVAL;
1381
1382 page = memdup_user_nul(buf, count);
1383 if (IS_ERR(page))
1384 return PTR_ERR(page);
1385
1386 mutex_lock(&fsi->state->policy_mutex);
1387
1388 length = avc_has_perm(&selinux_state,
1389 current_sid(), SECINITSID_SECURITY,
1390 SECCLASS_SECURITY, SECURITY__SETBOOL,
1391 NULL);
1392 if (length)
1393 goto out;
1394
1395 length = -EINVAL;
1396 if (sscanf(page, "%d", &new_value) != 1)
1397 goto out;
1398
1399 length = 0;
1400 if (new_value && fsi->bool_pending_values)
1401 length = security_set_bools(fsi->state, fsi->bool_num,
1402 fsi->bool_pending_values);
1403
1404 if (!length)
1405 length = count;
1406
1407out:
1408 mutex_unlock(&fsi->state->policy_mutex);
1409 kfree(page);
1410 return length;
1411}
1412
1413static const struct file_operations sel_commit_bools_ops = {
1414 .write = sel_commit_bools_write,
1415 .llseek = generic_file_llseek,
1416};
1417
1418static void sel_remove_entries(struct dentry *de)
1419{
1420 d_genocide(de);
1421 shrink_dcache_parent(de);
1422}
1423
1424static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1425 unsigned int *bool_num, char ***bool_pending_names,
1426 int **bool_pending_values)
1427{
1428 int ret;
1429 ssize_t len;
1430 struct dentry *dentry = NULL;
1431 struct inode *inode = NULL;
1432 struct inode_security_struct *isec;
1433 char **names = NULL, *page;
1434 u32 i, num;
1435 int *values = NULL;
1436 u32 sid;
1437
1438 ret = -ENOMEM;
1439 page = (char *)get_zeroed_page(GFP_KERNEL);
1440 if (!page)
1441 goto out;
1442
1443 ret = security_get_bools(newpolicy, &num, &names, &values);
1444 if (ret)
1445 goto out;
1446
1447 for (i = 0; i < num; i++) {
1448 ret = -ENOMEM;
1449 dentry = d_alloc_name(bool_dir, names[i]);
1450 if (!dentry)
1451 goto out;
1452
1453 ret = -ENOMEM;
1454 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1455 if (!inode) {
1456 dput(dentry);
1457 goto out;
1458 }
1459
1460 ret = -ENAMETOOLONG;
1461 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1462 if (len >= PAGE_SIZE) {
1463 dput(dentry);
1464 iput(inode);
1465 goto out;
1466 }
1467
1468 isec = selinux_inode(inode);
1469 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1470 SECCLASS_FILE, &sid);
1471 if (ret) {
1472 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1473 page);
1474 sid = SECINITSID_SECURITY;
1475 }
1476
1477 isec->sid = sid;
1478 isec->initialized = LABEL_INITIALIZED;
1479 inode->i_fop = &sel_bool_ops;
1480 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1481 d_add(dentry, inode);
1482 }
1483 *bool_num = num;
1484 *bool_pending_names = names;
1485 *bool_pending_values = values;
1486
1487 free_page((unsigned long)page);
1488 return 0;
1489out:
1490 free_page((unsigned long)page);
1491
1492 if (names) {
1493 for (i = 0; i < num; i++)
1494 kfree(names[i]);
1495 kfree(names);
1496 }
1497 kfree(values);
1498 sel_remove_entries(bool_dir);
1499
1500 return ret;
1501}
1502
1503static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1504 size_t count, loff_t *ppos)
1505{
1506 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1507 struct selinux_state *state = fsi->state;
1508 char tmpbuf[TMPBUFLEN];
1509 ssize_t length;
1510
1511 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1512 avc_get_cache_threshold(state->avc));
1513 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1514}
1515
1516static ssize_t sel_write_avc_cache_threshold(struct file *file,
1517 const char __user *buf,
1518 size_t count, loff_t *ppos)
1519
1520{
1521 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1522 struct selinux_state *state = fsi->state;
1523 char *page;
1524 ssize_t ret;
1525 unsigned int new_value;
1526
1527 ret = avc_has_perm(&selinux_state,
1528 current_sid(), SECINITSID_SECURITY,
1529 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1530 NULL);
1531 if (ret)
1532 return ret;
1533
1534 if (count >= PAGE_SIZE)
1535 return -ENOMEM;
1536
1537 /* No partial writes. */
1538 if (*ppos != 0)
1539 return -EINVAL;
1540
1541 page = memdup_user_nul(buf, count);
1542 if (IS_ERR(page))
1543 return PTR_ERR(page);
1544
1545 ret = -EINVAL;
1546 if (sscanf(page, "%u", &new_value) != 1)
1547 goto out;
1548
1549 avc_set_cache_threshold(state->avc, new_value);
1550
1551 ret = count;
1552out:
1553 kfree(page);
1554 return ret;
1555}
1556
1557static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1558 size_t count, loff_t *ppos)
1559{
1560 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1561 struct selinux_state *state = fsi->state;
1562 char *page;
1563 ssize_t length;
1564
1565 page = (char *)__get_free_page(GFP_KERNEL);
1566 if (!page)
1567 return -ENOMEM;
1568
1569 length = avc_get_hash_stats(state->avc, page);
1570 if (length >= 0)
1571 length = simple_read_from_buffer(buf, count, ppos, page, length);
1572 free_page((unsigned long)page);
1573
1574 return length;
1575}
1576
1577static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1578 size_t count, loff_t *ppos)
1579{
1580 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1581 struct selinux_state *state = fsi->state;
1582 char *page;
1583 ssize_t length;
1584
1585 page = (char *)__get_free_page(GFP_KERNEL);
1586 if (!page)
1587 return -ENOMEM;
1588
1589 length = security_sidtab_hash_stats(state, page);
1590 if (length >= 0)
1591 length = simple_read_from_buffer(buf, count, ppos, page,
1592 length);
1593 free_page((unsigned long)page);
1594
1595 return length;
1596}
1597
1598static const struct file_operations sel_sidtab_hash_stats_ops = {
1599 .read = sel_read_sidtab_hash_stats,
1600 .llseek = generic_file_llseek,
1601};
1602
1603static const struct file_operations sel_avc_cache_threshold_ops = {
1604 .read = sel_read_avc_cache_threshold,
1605 .write = sel_write_avc_cache_threshold,
1606 .llseek = generic_file_llseek,
1607};
1608
1609static const struct file_operations sel_avc_hash_stats_ops = {
1610 .read = sel_read_avc_hash_stats,
1611 .llseek = generic_file_llseek,
1612};
1613
1614#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1615static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1616{
1617 int cpu;
1618
1619 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1620 if (!cpu_possible(cpu))
1621 continue;
1622 *idx = cpu + 1;
1623 return &per_cpu(avc_cache_stats, cpu);
1624 }
1625 (*idx)++;
1626 return NULL;
1627}
1628
1629static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1630{
1631 loff_t n = *pos - 1;
1632
1633 if (*pos == 0)
1634 return SEQ_START_TOKEN;
1635
1636 return sel_avc_get_stat_idx(&n);
1637}
1638
1639static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1640{
1641 return sel_avc_get_stat_idx(pos);
1642}
1643
1644static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1645{
1646 struct avc_cache_stats *st = v;
1647
1648 if (v == SEQ_START_TOKEN) {
1649 seq_puts(seq,
1650 "lookups hits misses allocations reclaims frees\n");
1651 } else {
1652 unsigned int lookups = st->lookups;
1653 unsigned int misses = st->misses;
1654 unsigned int hits = lookups - misses;
1655 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1656 hits, misses, st->allocations,
1657 st->reclaims, st->frees);
1658 }
1659 return 0;
1660}
1661
1662static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1663{ }
1664
1665static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1666 .start = sel_avc_stats_seq_start,
1667 .next = sel_avc_stats_seq_next,
1668 .show = sel_avc_stats_seq_show,
1669 .stop = sel_avc_stats_seq_stop,
1670};
1671
1672static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1673{
1674 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1675}
1676
1677static const struct file_operations sel_avc_cache_stats_ops = {
1678 .open = sel_open_avc_cache_stats,
1679 .read = seq_read,
1680 .llseek = seq_lseek,
1681 .release = seq_release,
1682};
1683#endif
1684
1685static int sel_make_avc_files(struct dentry *dir)
1686{
1687 struct super_block *sb = dir->d_sb;
1688 struct selinux_fs_info *fsi = sb->s_fs_info;
1689 int i;
1690 static const struct tree_descr files[] = {
1691 { "cache_threshold",
1692 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1693 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1694#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1695 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1696#endif
1697 };
1698
1699 for (i = 0; i < ARRAY_SIZE(files); i++) {
1700 struct inode *inode;
1701 struct dentry *dentry;
1702
1703 dentry = d_alloc_name(dir, files[i].name);
1704 if (!dentry)
1705 return -ENOMEM;
1706
1707 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1708 if (!inode) {
1709 dput(dentry);
1710 return -ENOMEM;
1711 }
1712
1713 inode->i_fop = files[i].ops;
1714 inode->i_ino = ++fsi->last_ino;
1715 d_add(dentry, inode);
1716 }
1717
1718 return 0;
1719}
1720
1721static int sel_make_ss_files(struct dentry *dir)
1722{
1723 struct super_block *sb = dir->d_sb;
1724 struct selinux_fs_info *fsi = sb->s_fs_info;
1725 int i;
1726 static struct tree_descr files[] = {
1727 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1728 };
1729
1730 for (i = 0; i < ARRAY_SIZE(files); i++) {
1731 struct inode *inode;
1732 struct dentry *dentry;
1733
1734 dentry = d_alloc_name(dir, files[i].name);
1735 if (!dentry)
1736 return -ENOMEM;
1737
1738 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1739 if (!inode) {
1740 dput(dentry);
1741 return -ENOMEM;
1742 }
1743
1744 inode->i_fop = files[i].ops;
1745 inode->i_ino = ++fsi->last_ino;
1746 d_add(dentry, inode);
1747 }
1748
1749 return 0;
1750}
1751
1752static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1753 size_t count, loff_t *ppos)
1754{
1755 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1756 char *con;
1757 u32 sid, len;
1758 ssize_t ret;
1759
1760 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1761 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1762 if (ret)
1763 return ret;
1764
1765 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1766 kfree(con);
1767 return ret;
1768}
1769
1770static const struct file_operations sel_initcon_ops = {
1771 .read = sel_read_initcon,
1772 .llseek = generic_file_llseek,
1773};
1774
1775static int sel_make_initcon_files(struct dentry *dir)
1776{
1777 int i;
1778
1779 for (i = 1; i <= SECINITSID_NUM; i++) {
1780 struct inode *inode;
1781 struct dentry *dentry;
1782 const char *s = security_get_initial_sid_context(i);
1783
1784 if (!s)
1785 continue;
1786 dentry = d_alloc_name(dir, s);
1787 if (!dentry)
1788 return -ENOMEM;
1789
1790 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1791 if (!inode) {
1792 dput(dentry);
1793 return -ENOMEM;
1794 }
1795
1796 inode->i_fop = &sel_initcon_ops;
1797 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1798 d_add(dentry, inode);
1799 }
1800
1801 return 0;
1802}
1803
1804static inline unsigned long sel_class_to_ino(u16 class)
1805{
1806 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1807}
1808
1809static inline u16 sel_ino_to_class(unsigned long ino)
1810{
1811 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1812}
1813
1814static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1815{
1816 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1817}
1818
1819static inline u32 sel_ino_to_perm(unsigned long ino)
1820{
1821 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1822}
1823
1824static ssize_t sel_read_class(struct file *file, char __user *buf,
1825 size_t count, loff_t *ppos)
1826{
1827 unsigned long ino = file_inode(file)->i_ino;
1828 char res[TMPBUFLEN];
1829 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1830 return simple_read_from_buffer(buf, count, ppos, res, len);
1831}
1832
1833static const struct file_operations sel_class_ops = {
1834 .read = sel_read_class,
1835 .llseek = generic_file_llseek,
1836};
1837
1838static ssize_t sel_read_perm(struct file *file, char __user *buf,
1839 size_t count, loff_t *ppos)
1840{
1841 unsigned long ino = file_inode(file)->i_ino;
1842 char res[TMPBUFLEN];
1843 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1844 return simple_read_from_buffer(buf, count, ppos, res, len);
1845}
1846
1847static const struct file_operations sel_perm_ops = {
1848 .read = sel_read_perm,
1849 .llseek = generic_file_llseek,
1850};
1851
1852static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1853 size_t count, loff_t *ppos)
1854{
1855 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1856 int value;
1857 char tmpbuf[TMPBUFLEN];
1858 ssize_t length;
1859 unsigned long i_ino = file_inode(file)->i_ino;
1860
1861 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1862 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1863
1864 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1865}
1866
1867static const struct file_operations sel_policycap_ops = {
1868 .read = sel_read_policycap,
1869 .llseek = generic_file_llseek,
1870};
1871
1872static int sel_make_perm_files(struct selinux_policy *newpolicy,
1873 char *objclass, int classvalue,
1874 struct dentry *dir)
1875{
1876 int i, rc, nperms;
1877 char **perms;
1878
1879 rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1880 if (rc)
1881 return rc;
1882
1883 for (i = 0; i < nperms; i++) {
1884 struct inode *inode;
1885 struct dentry *dentry;
1886
1887 rc = -ENOMEM;
1888 dentry = d_alloc_name(dir, perms[i]);
1889 if (!dentry)
1890 goto out;
1891
1892 rc = -ENOMEM;
1893 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1894 if (!inode) {
1895 dput(dentry);
1896 goto out;
1897 }
1898
1899 inode->i_fop = &sel_perm_ops;
1900 /* i+1 since perm values are 1-indexed */
1901 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1902 d_add(dentry, inode);
1903 }
1904 rc = 0;
1905out:
1906 for (i = 0; i < nperms; i++)
1907 kfree(perms[i]);
1908 kfree(perms);
1909 return rc;
1910}
1911
1912static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1913 char *classname, int index,
1914 struct dentry *dir)
1915{
1916 struct super_block *sb = dir->d_sb;
1917 struct selinux_fs_info *fsi = sb->s_fs_info;
1918 struct dentry *dentry = NULL;
1919 struct inode *inode = NULL;
1920
1921 dentry = d_alloc_name(dir, "index");
1922 if (!dentry)
1923 return -ENOMEM;
1924
1925 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1926 if (!inode) {
1927 dput(dentry);
1928 return -ENOMEM;
1929 }
1930
1931 inode->i_fop = &sel_class_ops;
1932 inode->i_ino = sel_class_to_ino(index);
1933 d_add(dentry, inode);
1934
1935 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1936 if (IS_ERR(dentry))
1937 return PTR_ERR(dentry);
1938
1939 return sel_make_perm_files(newpolicy, classname, index, dentry);
1940}
1941
1942static int sel_make_classes(struct selinux_policy *newpolicy,
1943 struct dentry *class_dir,
1944 unsigned long *last_class_ino)
1945{
1946
1947 int rc, nclasses, i;
1948 char **classes;
1949
1950 rc = security_get_classes(newpolicy, &classes, &nclasses);
1951 if (rc)
1952 return rc;
1953
1954 /* +2 since classes are 1-indexed */
1955 *last_class_ino = sel_class_to_ino(nclasses + 2);
1956
1957 for (i = 0; i < nclasses; i++) {
1958 struct dentry *class_name_dir;
1959
1960 class_name_dir = sel_make_dir(class_dir, classes[i],
1961 last_class_ino);
1962 if (IS_ERR(class_name_dir)) {
1963 rc = PTR_ERR(class_name_dir);
1964 goto out;
1965 }
1966
1967 /* i+1 since class values are 1-indexed */
1968 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1969 class_name_dir);
1970 if (rc)
1971 goto out;
1972 }
1973 rc = 0;
1974out:
1975 for (i = 0; i < nclasses; i++)
1976 kfree(classes[i]);
1977 kfree(classes);
1978 return rc;
1979}
1980
1981static int sel_make_policycap(struct selinux_fs_info *fsi)
1982{
1983 unsigned int iter;
1984 struct dentry *dentry = NULL;
1985 struct inode *inode = NULL;
1986
1987 for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
1988 if (iter < ARRAY_SIZE(selinux_policycap_names))
1989 dentry = d_alloc_name(fsi->policycap_dir,
1990 selinux_policycap_names[iter]);
1991 else
1992 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1993
1994 if (dentry == NULL)
1995 return -ENOMEM;
1996
1997 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1998 if (inode == NULL) {
1999 dput(dentry);
2000 return -ENOMEM;
2001 }
2002
2003 inode->i_fop = &sel_policycap_ops;
2004 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
2005 d_add(dentry, inode);
2006 }
2007
2008 return 0;
2009}
2010
2011static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2012 unsigned long *ino)
2013{
2014 struct dentry *dentry = d_alloc_name(dir, name);
2015 struct inode *inode;
2016
2017 if (!dentry)
2018 return ERR_PTR(-ENOMEM);
2019
2020 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2021 if (!inode) {
2022 dput(dentry);
2023 return ERR_PTR(-ENOMEM);
2024 }
2025
2026 inode->i_op = &simple_dir_inode_operations;
2027 inode->i_fop = &simple_dir_operations;
2028 inode->i_ino = ++(*ino);
2029 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2030 inc_nlink(inode);
2031 d_add(dentry, inode);
2032 /* bump link count on parent directory, too */
2033 inc_nlink(d_inode(dir));
2034
2035 return dentry;
2036}
2037
2038static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2039 unsigned long *ino)
2040{
2041 struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2042
2043 if (!inode)
2044 return ERR_PTR(-ENOMEM);
2045
2046 inode->i_op = &simple_dir_inode_operations;
2047 inode->i_fop = &simple_dir_operations;
2048 inode->i_ino = ++(*ino);
2049 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2050 inc_nlink(inode);
2051 return d_obtain_alias(inode);
2052}
2053
2054#define NULL_FILE_NAME "null"
2055
2056static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2057{
2058 struct selinux_fs_info *fsi;
2059 int ret;
2060 struct dentry *dentry;
2061 struct inode *inode;
2062 struct inode_security_struct *isec;
2063
2064 static const struct tree_descr selinux_files[] = {
2065 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2066 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2067 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2068 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2069 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2070 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2071 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2072 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2073 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2074 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2075 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2076 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2077 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2078 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2079 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2080 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2081 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2082 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2083 S_IWUGO},
2084 /* last one */ {""}
2085 };
2086
2087 ret = selinux_fs_info_create(sb);
2088 if (ret)
2089 goto err;
2090
2091 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2092 if (ret)
2093 goto err;
2094
2095 fsi = sb->s_fs_info;
2096 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2097 if (IS_ERR(fsi->bool_dir)) {
2098 ret = PTR_ERR(fsi->bool_dir);
2099 fsi->bool_dir = NULL;
2100 goto err;
2101 }
2102
2103 ret = -ENOMEM;
2104 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2105 if (!dentry)
2106 goto err;
2107
2108 ret = -ENOMEM;
2109 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2110 if (!inode) {
2111 dput(dentry);
2112 goto err;
2113 }
2114
2115 inode->i_ino = ++fsi->last_ino;
2116 isec = selinux_inode(inode);
2117 isec->sid = SECINITSID_DEVNULL;
2118 isec->sclass = SECCLASS_CHR_FILE;
2119 isec->initialized = LABEL_INITIALIZED;
2120
2121 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2122 d_add(dentry, inode);
2123
2124 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2125 if (IS_ERR(dentry)) {
2126 ret = PTR_ERR(dentry);
2127 goto err;
2128 }
2129
2130 ret = sel_make_avc_files(dentry);
2131 if (ret)
2132 goto err;
2133
2134 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2135 if (IS_ERR(dentry)) {
2136 ret = PTR_ERR(dentry);
2137 goto err;
2138 }
2139
2140 ret = sel_make_ss_files(dentry);
2141 if (ret)
2142 goto err;
2143
2144 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2145 if (IS_ERR(dentry)) {
2146 ret = PTR_ERR(dentry);
2147 goto err;
2148 }
2149
2150 ret = sel_make_initcon_files(dentry);
2151 if (ret)
2152 goto err;
2153
2154 fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2155 if (IS_ERR(fsi->class_dir)) {
2156 ret = PTR_ERR(fsi->class_dir);
2157 fsi->class_dir = NULL;
2158 goto err;
2159 }
2160
2161 fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2162 &fsi->last_ino);
2163 if (IS_ERR(fsi->policycap_dir)) {
2164 ret = PTR_ERR(fsi->policycap_dir);
2165 fsi->policycap_dir = NULL;
2166 goto err;
2167 }
2168
2169 ret = sel_make_policycap(fsi);
2170 if (ret) {
2171 pr_err("SELinux: failed to load policy capabilities\n");
2172 goto err;
2173 }
2174
2175 return 0;
2176err:
2177 pr_err("SELinux: %s: failed while creating inodes\n",
2178 __func__);
2179
2180 selinux_fs_info_free(sb);
2181
2182 return ret;
2183}
2184
2185static int sel_get_tree(struct fs_context *fc)
2186{
2187 return get_tree_single(fc, sel_fill_super);
2188}
2189
2190static const struct fs_context_operations sel_context_ops = {
2191 .get_tree = sel_get_tree,
2192};
2193
2194static int sel_init_fs_context(struct fs_context *fc)
2195{
2196 fc->ops = &sel_context_ops;
2197 return 0;
2198}
2199
2200static void sel_kill_sb(struct super_block *sb)
2201{
2202 selinux_fs_info_free(sb);
2203 kill_litter_super(sb);
2204}
2205
2206static struct file_system_type sel_fs_type = {
2207 .name = "selinuxfs",
2208 .init_fs_context = sel_init_fs_context,
2209 .kill_sb = sel_kill_sb,
2210};
2211
2212static struct vfsmount *selinuxfs_mount __ro_after_init;
2213struct path selinux_null __ro_after_init;
2214
2215static int __init init_sel_fs(void)
2216{
2217 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2218 sizeof(NULL_FILE_NAME)-1);
2219 int err;
2220
2221 if (!selinux_enabled_boot)
2222 return 0;
2223
2224 err = sysfs_create_mount_point(fs_kobj, "selinux");
2225 if (err)
2226 return err;
2227
2228 err = register_filesystem(&sel_fs_type);
2229 if (err) {
2230 sysfs_remove_mount_point(fs_kobj, "selinux");
2231 return err;
2232 }
2233
2234 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2235 if (IS_ERR(selinuxfs_mount)) {
2236 pr_err("selinuxfs: could not mount!\n");
2237 err = PTR_ERR(selinuxfs_mount);
2238 selinuxfs_mount = NULL;
2239 }
2240 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2241 &null_name);
2242 if (IS_ERR(selinux_null.dentry)) {
2243 pr_err("selinuxfs: could not lookup null!\n");
2244 err = PTR_ERR(selinux_null.dentry);
2245 selinux_null.dentry = NULL;
2246 }
2247
2248 return err;
2249}
2250
2251__initcall(init_sel_fs);
2252
2253#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2254void exit_sel_fs(void)
2255{
2256 sysfs_remove_mount_point(fs_kobj, "selinux");
2257 dput(selinux_null.dentry);
2258 kern_unmount(selinuxfs_mount);
2259 unregister_filesystem(&sel_fs_type);
2260}
2261#endif