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