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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_INO_NEXT, /* The next inode number to use */
120};
121
122static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
123
124#define SEL_INITCON_INO_OFFSET 0x01000000
125#define SEL_BOOL_INO_OFFSET 0x02000000
126#define SEL_CLASS_INO_OFFSET 0x04000000
127#define SEL_POLICYCAP_INO_OFFSET 0x08000000
128#define SEL_INO_MASK 0x00ffffff
129
130#define TMPBUFLEN 12
131static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
132 size_t count, loff_t *ppos)
133{
134 char tmpbuf[TMPBUFLEN];
135 ssize_t length;
136
137 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
138 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
139}
140
141#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
142static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
143 size_t count, loff_t *ppos)
144
145{
146 char *page = NULL;
147 ssize_t length;
148 int new_value;
149
150 length = -ENOMEM;
151 if (count >= PAGE_SIZE)
152 goto out;
153
154 /* No partial writes. */
155 length = EINVAL;
156 if (*ppos != 0)
157 goto out;
158
159 length = -ENOMEM;
160 page = (char *)get_zeroed_page(GFP_KERNEL);
161 if (!page)
162 goto out;
163
164 length = -EFAULT;
165 if (copy_from_user(page, buf, count))
166 goto out;
167
168 length = -EINVAL;
169 if (sscanf(page, "%d", &new_value) != 1)
170 goto out;
171
172 if (new_value != selinux_enforcing) {
173 length = task_has_security(current, SECURITY__SETENFORCE);
174 if (length)
175 goto out;
176 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
177 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
178 new_value, selinux_enforcing,
179 from_kuid(&init_user_ns, audit_get_loginuid(current)),
180 audit_get_sessionid(current));
181 selinux_enforcing = new_value;
182 if (selinux_enforcing)
183 avc_ss_reset(0);
184 selnl_notify_setenforce(selinux_enforcing);
185 selinux_status_update_setenforce(selinux_enforcing);
186 }
187 length = count;
188out:
189 free_page((unsigned long) page);
190 return length;
191}
192#else
193#define sel_write_enforce NULL
194#endif
195
196static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 .llseek = generic_file_llseek,
200};
201
202static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
204{
205 char tmpbuf[TMPBUFLEN];
206 ssize_t length;
207 ino_t ino = file_inode(filp)->i_ino;
208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213}
214
215static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
218};
219
220static int sel_open_handle_status(struct inode *inode, struct file *filp)
221{
222 struct page *status = selinux_kernel_status_page();
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230}
231
232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234{
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242}
243
244static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246{
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264}
265
266static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271};
272
273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277{
278 char *page = NULL;
279 ssize_t length;
280 int new_value;
281
282 length = -ENOMEM;
283 if (count >= PAGE_SIZE)
284 goto out;
285
286 /* No partial writes. */
287 length = -EINVAL;
288 if (*ppos != 0)
289 goto out;
290
291 length = -ENOMEM;
292 page = (char *)get_zeroed_page(GFP_KERNEL);
293 if (!page)
294 goto out;
295
296 length = -EFAULT;
297 if (copy_from_user(page, buf, count))
298 goto out;
299
300 length = -EINVAL;
301 if (sscanf(page, "%d", &new_value) != 1)
302 goto out;
303
304 if (new_value) {
305 length = selinux_disable();
306 if (length)
307 goto out;
308 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
309 "selinux=0 auid=%u ses=%u",
310 from_kuid(&init_user_ns, audit_get_loginuid(current)),
311 audit_get_sessionid(current));
312 }
313
314 length = count;
315out:
316 free_page((unsigned long) page);
317 return length;
318}
319#else
320#define sel_write_disable NULL
321#endif
322
323static const struct file_operations sel_disable_ops = {
324 .write = sel_write_disable,
325 .llseek = generic_file_llseek,
326};
327
328static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
329 size_t count, loff_t *ppos)
330{
331 char tmpbuf[TMPBUFLEN];
332 ssize_t length;
333
334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
335 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
336}
337
338static const struct file_operations sel_policyvers_ops = {
339 .read = sel_read_policyvers,
340 .llseek = generic_file_llseek,
341};
342
343/* declaration for sel_write_load */
344static int sel_make_bools(void);
345static int sel_make_classes(void);
346static int sel_make_policycap(void);
347
348/* declaration for sel_make_class_dirs */
349static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
350 unsigned long *ino);
351
352static ssize_t sel_read_mls(struct file *filp, char __user *buf,
353 size_t count, loff_t *ppos)
354{
355 char tmpbuf[TMPBUFLEN];
356 ssize_t length;
357
358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled());
360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
361}
362
363static const struct file_operations sel_mls_ops = {
364 .read = sel_read_mls,
365 .llseek = generic_file_llseek,
366};
367
368struct policy_load_memory {
369 size_t len;
370 void *data;
371};
372
373static int sel_open_policy(struct inode *inode, struct file *filp)
374{
375 struct policy_load_memory *plm = NULL;
376 int rc;
377
378 BUG_ON(filp->private_data);
379
380 mutex_lock(&sel_mutex);
381
382 rc = task_has_security(current, SECURITY__READ_POLICY);
383 if (rc)
384 goto err;
385
386 rc = -EBUSY;
387 if (policy_opened)
388 goto err;
389
390 rc = -ENOMEM;
391 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
392 if (!plm)
393 goto err;
394
395 if (i_size_read(inode) != security_policydb_len()) {
396 mutex_lock(&inode->i_mutex);
397 i_size_write(inode, security_policydb_len());
398 mutex_unlock(&inode->i_mutex);
399 }
400
401 rc = security_read_policy(&plm->data, &plm->len);
402 if (rc)
403 goto err;
404
405 policy_opened = 1;
406
407 filp->private_data = plm;
408
409 mutex_unlock(&sel_mutex);
410
411 return 0;
412err:
413 mutex_unlock(&sel_mutex);
414
415 if (plm)
416 vfree(plm->data);
417 kfree(plm);
418 return rc;
419}
420
421static int sel_release_policy(struct inode *inode, struct file *filp)
422{
423 struct policy_load_memory *plm = filp->private_data;
424
425 BUG_ON(!plm);
426
427 policy_opened = 0;
428
429 vfree(plm->data);
430 kfree(plm);
431
432 return 0;
433}
434
435static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
437{
438 struct policy_load_memory *plm = filp->private_data;
439 int ret;
440
441 mutex_lock(&sel_mutex);
442
443 ret = task_has_security(current, SECURITY__READ_POLICY);
444 if (ret)
445 goto out;
446
447 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
448out:
449 mutex_unlock(&sel_mutex);
450 return ret;
451}
452
453static int sel_mmap_policy_fault(struct vm_area_struct *vma,
454 struct vm_fault *vmf)
455{
456 struct policy_load_memory *plm = vma->vm_file->private_data;
457 unsigned long offset;
458 struct page *page;
459
460 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
461 return VM_FAULT_SIGBUS;
462
463 offset = vmf->pgoff << PAGE_SHIFT;
464 if (offset >= roundup(plm->len, PAGE_SIZE))
465 return VM_FAULT_SIGBUS;
466
467 page = vmalloc_to_page(plm->data + offset);
468 get_page(page);
469
470 vmf->page = page;
471
472 return 0;
473}
474
475static struct vm_operations_struct sel_mmap_policy_ops = {
476 .fault = sel_mmap_policy_fault,
477 .page_mkwrite = sel_mmap_policy_fault,
478};
479
480static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
481{
482 if (vma->vm_flags & VM_SHARED) {
483 /* do not allow mprotect to make mapping writable */
484 vma->vm_flags &= ~VM_MAYWRITE;
485
486 if (vma->vm_flags & VM_WRITE)
487 return -EACCES;
488 }
489
490 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
491 vma->vm_ops = &sel_mmap_policy_ops;
492
493 return 0;
494}
495
496static const struct file_operations sel_policy_ops = {
497 .open = sel_open_policy,
498 .read = sel_read_policy,
499 .mmap = sel_mmap_policy,
500 .release = sel_release_policy,
501 .llseek = generic_file_llseek,
502};
503
504static ssize_t sel_write_load(struct file *file, const char __user *buf,
505 size_t count, loff_t *ppos)
506
507{
508 ssize_t length;
509 void *data = NULL;
510
511 mutex_lock(&sel_mutex);
512
513 length = task_has_security(current, SECURITY__LOAD_POLICY);
514 if (length)
515 goto out;
516
517 /* No partial writes. */
518 length = -EINVAL;
519 if (*ppos != 0)
520 goto out;
521
522 length = -EFBIG;
523 if (count > 64 * 1024 * 1024)
524 goto out;
525
526 length = -ENOMEM;
527 data = vmalloc(count);
528 if (!data)
529 goto out;
530
531 length = -EFAULT;
532 if (copy_from_user(data, buf, count) != 0)
533 goto out;
534
535 length = security_load_policy(data, count);
536 if (length)
537 goto out;
538
539 length = sel_make_bools();
540 if (length)
541 goto out1;
542
543 length = sel_make_classes();
544 if (length)
545 goto out1;
546
547 length = sel_make_policycap();
548 if (length)
549 goto out1;
550
551 length = count;
552
553out1:
554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
555 "policy loaded auid=%u ses=%u",
556 from_kuid(&init_user_ns, audit_get_loginuid(current)),
557 audit_get_sessionid(current));
558out:
559 mutex_unlock(&sel_mutex);
560 vfree(data);
561 return length;
562}
563
564static const struct file_operations sel_load_ops = {
565 .write = sel_write_load,
566 .llseek = generic_file_llseek,
567};
568
569static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
570{
571 char *canon = NULL;
572 u32 sid, len;
573 ssize_t length;
574
575 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
576 if (length)
577 goto out;
578
579 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
580 if (length)
581 goto out;
582
583 length = security_sid_to_context(sid, &canon, &len);
584 if (length)
585 goto out;
586
587 length = -ERANGE;
588 if (len > SIMPLE_TRANSACTION_LIMIT) {
589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
591 goto out;
592 }
593
594 memcpy(buf, canon, len);
595 length = len;
596out:
597 kfree(canon);
598 return length;
599}
600
601static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
602 size_t count, loff_t *ppos)
603{
604 char tmpbuf[TMPBUFLEN];
605 ssize_t length;
606
607 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
608 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
609}
610
611static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
612 size_t count, loff_t *ppos)
613{
614 char *page = NULL;
615 ssize_t length;
616 unsigned int new_value;
617
618 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
619 if (length)
620 goto out;
621
622 length = -ENOMEM;
623 if (count >= PAGE_SIZE)
624 goto out;
625
626 /* No partial writes. */
627 length = -EINVAL;
628 if (*ppos != 0)
629 goto out;
630
631 length = -ENOMEM;
632 page = (char *)get_zeroed_page(GFP_KERNEL);
633 if (!page)
634 goto out;
635
636 length = -EFAULT;
637 if (copy_from_user(page, buf, count))
638 goto out;
639
640 length = -EINVAL;
641 if (sscanf(page, "%u", &new_value) != 1)
642 goto out;
643
644 selinux_checkreqprot = new_value ? 1 : 0;
645 length = count;
646out:
647 free_page((unsigned long) page);
648 return length;
649}
650static const struct file_operations sel_checkreqprot_ops = {
651 .read = sel_read_checkreqprot,
652 .write = sel_write_checkreqprot,
653 .llseek = generic_file_llseek,
654};
655
656/*
657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
658 */
659static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
664
665static ssize_t (*write_op[])(struct file *, char *, size_t) = {
666 [SEL_ACCESS] = sel_write_access,
667 [SEL_CREATE] = sel_write_create,
668 [SEL_RELABEL] = sel_write_relabel,
669 [SEL_USER] = sel_write_user,
670 [SEL_MEMBER] = sel_write_member,
671 [SEL_CONTEXT] = sel_write_context,
672};
673
674static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
675{
676 ino_t ino = file_inode(file)->i_ino;
677 char *data;
678 ssize_t rv;
679
680 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
681 return -EINVAL;
682
683 data = simple_transaction_get(file, buf, size);
684 if (IS_ERR(data))
685 return PTR_ERR(data);
686
687 rv = write_op[ino](file, data, size);
688 if (rv > 0) {
689 simple_transaction_set(file, rv);
690 rv = size;
691 }
692 return rv;
693}
694
695static const struct file_operations transaction_ops = {
696 .write = selinux_transaction_write,
697 .read = simple_transaction_read,
698 .release = simple_transaction_release,
699 .llseek = generic_file_llseek,
700};
701
702/*
703 * payload - write methods
704 * If the method has a response, the response should be put in buf,
705 * and the length returned. Otherwise return 0 or and -error.
706 */
707
708static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
709{
710 char *scon = NULL, *tcon = NULL;
711 u32 ssid, tsid;
712 u16 tclass;
713 struct av_decision avd;
714 ssize_t length;
715
716 length = task_has_security(current, SECURITY__COMPUTE_AV);
717 if (length)
718 goto out;
719
720 length = -ENOMEM;
721 scon = kzalloc(size + 1, GFP_KERNEL);
722 if (!scon)
723 goto out;
724
725 length = -ENOMEM;
726 tcon = kzalloc(size + 1, GFP_KERNEL);
727 if (!tcon)
728 goto out;
729
730 length = -EINVAL;
731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
732 goto out;
733
734 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
735 GFP_KERNEL);
736 if (length)
737 goto out;
738
739 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
740 GFP_KERNEL);
741 if (length)
742 goto out;
743
744 security_compute_av_user(ssid, tsid, tclass, &avd);
745
746 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
747 "%x %x %x %x %u %x",
748 avd.allowed, 0xffffffff,
749 avd.auditallow, avd.auditdeny,
750 avd.seqno, avd.flags);
751out:
752 kfree(tcon);
753 kfree(scon);
754 return length;
755}
756
757static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
758{
759 char *scon = NULL, *tcon = NULL;
760 char *namebuf = NULL, *objname = NULL;
761 u32 ssid, tsid, newsid;
762 u16 tclass;
763 ssize_t length;
764 char *newcon = NULL;
765 u32 len;
766 int nargs;
767
768 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
769 if (length)
770 goto out;
771
772 length = -ENOMEM;
773 scon = kzalloc(size + 1, GFP_KERNEL);
774 if (!scon)
775 goto out;
776
777 length = -ENOMEM;
778 tcon = kzalloc(size + 1, GFP_KERNEL);
779 if (!tcon)
780 goto out;
781
782 length = -ENOMEM;
783 namebuf = kzalloc(size + 1, GFP_KERNEL);
784 if (!namebuf)
785 goto out;
786
787 length = -EINVAL;
788 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
789 if (nargs < 3 || nargs > 4)
790 goto out;
791 if (nargs == 4) {
792 /*
793 * If and when the name of new object to be queried contains
794 * either whitespace or multibyte characters, they shall be
795 * encoded based on the percentage-encoding rule.
796 * If not encoded, the sscanf logic picks up only left-half
797 * of the supplied name; splitted by a whitespace unexpectedly.
798 */
799 char *r, *w;
800 int c1, c2;
801
802 r = w = namebuf;
803 do {
804 c1 = *r++;
805 if (c1 == '+')
806 c1 = ' ';
807 else if (c1 == '%') {
808 c1 = hex_to_bin(*r++);
809 if (c1 < 0)
810 goto out;
811 c2 = hex_to_bin(*r++);
812 if (c2 < 0)
813 goto out;
814 c1 = (c1 << 4) | c2;
815 }
816 *w++ = c1;
817 } while (c1 != '\0');
818
819 objname = namebuf;
820 }
821
822 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
823 GFP_KERNEL);
824 if (length)
825 goto out;
826
827 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
828 GFP_KERNEL);
829 if (length)
830 goto out;
831
832 length = security_transition_sid_user(ssid, tsid, tclass,
833 objname, &newsid);
834 if (length)
835 goto out;
836
837 length = security_sid_to_context(newsid, &newcon, &len);
838 if (length)
839 goto out;
840
841 length = -ERANGE;
842 if (len > SIMPLE_TRANSACTION_LIMIT) {
843 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
844 "payload max\n", __func__, len);
845 goto out;
846 }
847
848 memcpy(buf, newcon, len);
849 length = len;
850out:
851 kfree(newcon);
852 kfree(namebuf);
853 kfree(tcon);
854 kfree(scon);
855 return length;
856}
857
858static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
859{
860 char *scon = NULL, *tcon = NULL;
861 u32 ssid, tsid, newsid;
862 u16 tclass;
863 ssize_t length;
864 char *newcon = NULL;
865 u32 len;
866
867 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
868 if (length)
869 goto out;
870
871 length = -ENOMEM;
872 scon = kzalloc(size + 1, GFP_KERNEL);
873 if (!scon)
874 goto out;
875
876 length = -ENOMEM;
877 tcon = kzalloc(size + 1, GFP_KERNEL);
878 if (!tcon)
879 goto out;
880
881 length = -EINVAL;
882 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
883 goto out;
884
885 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
886 GFP_KERNEL);
887 if (length)
888 goto out;
889
890 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
891 GFP_KERNEL);
892 if (length)
893 goto out;
894
895 length = security_change_sid(ssid, tsid, tclass, &newsid);
896 if (length)
897 goto out;
898
899 length = security_sid_to_context(newsid, &newcon, &len);
900 if (length)
901 goto out;
902
903 length = -ERANGE;
904 if (len > SIMPLE_TRANSACTION_LIMIT)
905 goto out;
906
907 memcpy(buf, newcon, len);
908 length = len;
909out:
910 kfree(newcon);
911 kfree(tcon);
912 kfree(scon);
913 return length;
914}
915
916static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
917{
918 char *con = NULL, *user = NULL, *ptr;
919 u32 sid, *sids = NULL;
920 ssize_t length;
921 char *newcon;
922 int i, rc;
923 u32 len, nsids;
924
925 length = task_has_security(current, SECURITY__COMPUTE_USER);
926 if (length)
927 goto out;
928
929 length = -ENOMEM;
930 con = kzalloc(size + 1, GFP_KERNEL);
931 if (!con)
932 goto out;
933
934 length = -ENOMEM;
935 user = kzalloc(size + 1, GFP_KERNEL);
936 if (!user)
937 goto out;
938
939 length = -EINVAL;
940 if (sscanf(buf, "%s %s", con, user) != 2)
941 goto out;
942
943 length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL);
944 if (length)
945 goto out;
946
947 length = security_get_user_sids(sid, user, &sids, &nsids);
948 if (length)
949 goto out;
950
951 length = sprintf(buf, "%u", nsids) + 1;
952 ptr = buf + length;
953 for (i = 0; i < nsids; i++) {
954 rc = security_sid_to_context(sids[i], &newcon, &len);
955 if (rc) {
956 length = rc;
957 goto out;
958 }
959 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
960 kfree(newcon);
961 length = -ERANGE;
962 goto out;
963 }
964 memcpy(ptr, newcon, len);
965 kfree(newcon);
966 ptr += len;
967 length += len;
968 }
969out:
970 kfree(sids);
971 kfree(user);
972 kfree(con);
973 return length;
974}
975
976static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
977{
978 char *scon = NULL, *tcon = NULL;
979 u32 ssid, tsid, newsid;
980 u16 tclass;
981 ssize_t length;
982 char *newcon = NULL;
983 u32 len;
984
985 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
986 if (length)
987 goto out;
988
989 length = -ENOMEM;
990 scon = kzalloc(size + 1, GFP_KERNEL);
991 if (!scon)
992 goto out;
993
994 length = -ENOMEM;
995 tcon = kzalloc(size + 1, GFP_KERNEL);
996 if (!tcon)
997 goto out;
998
999 length = -EINVAL;
1000 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1001 goto out;
1002
1003 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
1004 GFP_KERNEL);
1005 if (length)
1006 goto out;
1007
1008 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
1009 GFP_KERNEL);
1010 if (length)
1011 goto out;
1012
1013 length = security_member_sid(ssid, tsid, tclass, &newsid);
1014 if (length)
1015 goto out;
1016
1017 length = security_sid_to_context(newsid, &newcon, &len);
1018 if (length)
1019 goto out;
1020
1021 length = -ERANGE;
1022 if (len > SIMPLE_TRANSACTION_LIMIT) {
1023 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1024 "payload max\n", __func__, len);
1025 goto out;
1026 }
1027
1028 memcpy(buf, newcon, len);
1029 length = len;
1030out:
1031 kfree(newcon);
1032 kfree(tcon);
1033 kfree(scon);
1034 return length;
1035}
1036
1037static struct inode *sel_make_inode(struct super_block *sb, int mode)
1038{
1039 struct inode *ret = new_inode(sb);
1040
1041 if (ret) {
1042 ret->i_mode = mode;
1043 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1044 }
1045 return ret;
1046}
1047
1048static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1049 size_t count, loff_t *ppos)
1050{
1051 char *page = NULL;
1052 ssize_t length;
1053 ssize_t ret;
1054 int cur_enforcing;
1055 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1056 const char *name = filep->f_path.dentry->d_name.name;
1057
1058 mutex_lock(&sel_mutex);
1059
1060 ret = -EINVAL;
1061 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1062 goto out;
1063
1064 ret = -ENOMEM;
1065 page = (char *)get_zeroed_page(GFP_KERNEL);
1066 if (!page)
1067 goto out;
1068
1069 cur_enforcing = security_get_bool_value(index);
1070 if (cur_enforcing < 0) {
1071 ret = cur_enforcing;
1072 goto out;
1073 }
1074 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1075 bool_pending_values[index]);
1076 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1077out:
1078 mutex_unlock(&sel_mutex);
1079 free_page((unsigned long)page);
1080 return ret;
1081}
1082
1083static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1084 size_t count, loff_t *ppos)
1085{
1086 char *page = NULL;
1087 ssize_t length;
1088 int new_value;
1089 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1090 const char *name = filep->f_path.dentry->d_name.name;
1091
1092 mutex_lock(&sel_mutex);
1093
1094 length = task_has_security(current, SECURITY__SETBOOL);
1095 if (length)
1096 goto out;
1097
1098 length = -EINVAL;
1099 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1100 goto out;
1101
1102 length = -ENOMEM;
1103 if (count >= PAGE_SIZE)
1104 goto out;
1105
1106 /* No partial writes. */
1107 length = -EINVAL;
1108 if (*ppos != 0)
1109 goto out;
1110
1111 length = -ENOMEM;
1112 page = (char *)get_zeroed_page(GFP_KERNEL);
1113 if (!page)
1114 goto out;
1115
1116 length = -EFAULT;
1117 if (copy_from_user(page, buf, count))
1118 goto out;
1119
1120 length = -EINVAL;
1121 if (sscanf(page, "%d", &new_value) != 1)
1122 goto out;
1123
1124 if (new_value)
1125 new_value = 1;
1126
1127 bool_pending_values[index] = new_value;
1128 length = count;
1129
1130out:
1131 mutex_unlock(&sel_mutex);
1132 free_page((unsigned long) page);
1133 return length;
1134}
1135
1136static const struct file_operations sel_bool_ops = {
1137 .read = sel_read_bool,
1138 .write = sel_write_bool,
1139 .llseek = generic_file_llseek,
1140};
1141
1142static ssize_t sel_commit_bools_write(struct file *filep,
1143 const char __user *buf,
1144 size_t count, loff_t *ppos)
1145{
1146 char *page = NULL;
1147 ssize_t length;
1148 int new_value;
1149
1150 mutex_lock(&sel_mutex);
1151
1152 length = task_has_security(current, SECURITY__SETBOOL);
1153 if (length)
1154 goto out;
1155
1156 length = -ENOMEM;
1157 if (count >= PAGE_SIZE)
1158 goto out;
1159
1160 /* No partial writes. */
1161 length = -EINVAL;
1162 if (*ppos != 0)
1163 goto out;
1164
1165 length = -ENOMEM;
1166 page = (char *)get_zeroed_page(GFP_KERNEL);
1167 if (!page)
1168 goto out;
1169
1170 length = -EFAULT;
1171 if (copy_from_user(page, buf, count))
1172 goto out;
1173
1174 length = -EINVAL;
1175 if (sscanf(page, "%d", &new_value) != 1)
1176 goto out;
1177
1178 length = 0;
1179 if (new_value && bool_pending_values)
1180 length = security_set_bools(bool_num, bool_pending_values);
1181
1182 if (!length)
1183 length = count;
1184
1185out:
1186 mutex_unlock(&sel_mutex);
1187 free_page((unsigned long) page);
1188 return length;
1189}
1190
1191static const struct file_operations sel_commit_bools_ops = {
1192 .write = sel_commit_bools_write,
1193 .llseek = generic_file_llseek,
1194};
1195
1196static void sel_remove_entries(struct dentry *de)
1197{
1198 struct list_head *node;
1199
1200 spin_lock(&de->d_lock);
1201 node = de->d_subdirs.next;
1202 while (node != &de->d_subdirs) {
1203 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1204
1205 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1206 list_del_init(node);
1207
1208 if (d->d_inode) {
1209 dget_dlock(d);
1210 spin_unlock(&de->d_lock);
1211 spin_unlock(&d->d_lock);
1212 d_delete(d);
1213 simple_unlink(de->d_inode, d);
1214 dput(d);
1215 spin_lock(&de->d_lock);
1216 } else
1217 spin_unlock(&d->d_lock);
1218 node = de->d_subdirs.next;
1219 }
1220
1221 spin_unlock(&de->d_lock);
1222}
1223
1224#define BOOL_DIR_NAME "booleans"
1225
1226static int sel_make_bools(void)
1227{
1228 int i, ret;
1229 ssize_t len;
1230 struct dentry *dentry = NULL;
1231 struct dentry *dir = bool_dir;
1232 struct inode *inode = NULL;
1233 struct inode_security_struct *isec;
1234 char **names = NULL, *page;
1235 int num;
1236 int *values = NULL;
1237 u32 sid;
1238
1239 /* remove any existing files */
1240 for (i = 0; i < bool_num; i++)
1241 kfree(bool_pending_names[i]);
1242 kfree(bool_pending_names);
1243 kfree(bool_pending_values);
1244 bool_num = 0;
1245 bool_pending_names = NULL;
1246 bool_pending_values = NULL;
1247
1248 sel_remove_entries(dir);
1249
1250 ret = -ENOMEM;
1251 page = (char *)get_zeroed_page(GFP_KERNEL);
1252 if (!page)
1253 goto out;
1254
1255 ret = security_get_bools(&num, &names, &values);
1256 if (ret)
1257 goto out;
1258
1259 for (i = 0; i < num; i++) {
1260 ret = -ENOMEM;
1261 dentry = d_alloc_name(dir, names[i]);
1262 if (!dentry)
1263 goto out;
1264
1265 ret = -ENOMEM;
1266 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1267 if (!inode)
1268 goto out;
1269
1270 ret = -ENAMETOOLONG;
1271 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1272 if (len >= PAGE_SIZE)
1273 goto out;
1274
1275 isec = (struct inode_security_struct *)inode->i_security;
1276 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1277 if (ret)
1278 goto out;
1279
1280 isec->sid = sid;
1281 isec->initialized = 1;
1282 inode->i_fop = &sel_bool_ops;
1283 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1284 d_add(dentry, inode);
1285 }
1286 bool_num = num;
1287 bool_pending_names = names;
1288 bool_pending_values = values;
1289
1290 free_page((unsigned long)page);
1291 return 0;
1292out:
1293 free_page((unsigned long)page);
1294
1295 if (names) {
1296 for (i = 0; i < num; i++)
1297 kfree(names[i]);
1298 kfree(names);
1299 }
1300 kfree(values);
1301 sel_remove_entries(dir);
1302
1303 return ret;
1304}
1305
1306#define NULL_FILE_NAME "null"
1307
1308struct path selinux_null;
1309
1310static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1311 size_t count, loff_t *ppos)
1312{
1313 char tmpbuf[TMPBUFLEN];
1314 ssize_t length;
1315
1316 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1317 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1318}
1319
1320static ssize_t sel_write_avc_cache_threshold(struct file *file,
1321 const char __user *buf,
1322 size_t count, loff_t *ppos)
1323
1324{
1325 char *page = NULL;
1326 ssize_t ret;
1327 int new_value;
1328
1329 ret = task_has_security(current, SECURITY__SETSECPARAM);
1330 if (ret)
1331 goto out;
1332
1333 ret = -ENOMEM;
1334 if (count >= PAGE_SIZE)
1335 goto out;
1336
1337 /* No partial writes. */
1338 ret = -EINVAL;
1339 if (*ppos != 0)
1340 goto out;
1341
1342 ret = -ENOMEM;
1343 page = (char *)get_zeroed_page(GFP_KERNEL);
1344 if (!page)
1345 goto out;
1346
1347 ret = -EFAULT;
1348 if (copy_from_user(page, buf, count))
1349 goto out;
1350
1351 ret = -EINVAL;
1352 if (sscanf(page, "%u", &new_value) != 1)
1353 goto out;
1354
1355 avc_cache_threshold = new_value;
1356
1357 ret = count;
1358out:
1359 free_page((unsigned long)page);
1360 return ret;
1361}
1362
1363static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1364 size_t count, loff_t *ppos)
1365{
1366 char *page;
1367 ssize_t length;
1368
1369 page = (char *)__get_free_page(GFP_KERNEL);
1370 if (!page)
1371 return -ENOMEM;
1372
1373 length = avc_get_hash_stats(page);
1374 if (length >= 0)
1375 length = simple_read_from_buffer(buf, count, ppos, page, length);
1376 free_page((unsigned long)page);
1377
1378 return length;
1379}
1380
1381static const struct file_operations sel_avc_cache_threshold_ops = {
1382 .read = sel_read_avc_cache_threshold,
1383 .write = sel_write_avc_cache_threshold,
1384 .llseek = generic_file_llseek,
1385};
1386
1387static const struct file_operations sel_avc_hash_stats_ops = {
1388 .read = sel_read_avc_hash_stats,
1389 .llseek = generic_file_llseek,
1390};
1391
1392#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1393static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1394{
1395 int cpu;
1396
1397 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1398 if (!cpu_possible(cpu))
1399 continue;
1400 *idx = cpu + 1;
1401 return &per_cpu(avc_cache_stats, cpu);
1402 }
1403 return NULL;
1404}
1405
1406static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1407{
1408 loff_t n = *pos - 1;
1409
1410 if (*pos == 0)
1411 return SEQ_START_TOKEN;
1412
1413 return sel_avc_get_stat_idx(&n);
1414}
1415
1416static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1417{
1418 return sel_avc_get_stat_idx(pos);
1419}
1420
1421static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1422{
1423 struct avc_cache_stats *st = v;
1424
1425 if (v == SEQ_START_TOKEN)
1426 seq_printf(seq, "lookups hits misses allocations reclaims "
1427 "frees\n");
1428 else {
1429 unsigned int lookups = st->lookups;
1430 unsigned int misses = st->misses;
1431 unsigned int hits = lookups - misses;
1432 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1433 hits, misses, st->allocations,
1434 st->reclaims, st->frees);
1435 }
1436 return 0;
1437}
1438
1439static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1440{ }
1441
1442static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1443 .start = sel_avc_stats_seq_start,
1444 .next = sel_avc_stats_seq_next,
1445 .show = sel_avc_stats_seq_show,
1446 .stop = sel_avc_stats_seq_stop,
1447};
1448
1449static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1450{
1451 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1452}
1453
1454static const struct file_operations sel_avc_cache_stats_ops = {
1455 .open = sel_open_avc_cache_stats,
1456 .read = seq_read,
1457 .llseek = seq_lseek,
1458 .release = seq_release,
1459};
1460#endif
1461
1462static int sel_make_avc_files(struct dentry *dir)
1463{
1464 int i;
1465 static struct tree_descr files[] = {
1466 { "cache_threshold",
1467 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1468 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1469#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1470 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1471#endif
1472 };
1473
1474 for (i = 0; i < ARRAY_SIZE(files); i++) {
1475 struct inode *inode;
1476 struct dentry *dentry;
1477
1478 dentry = d_alloc_name(dir, files[i].name);
1479 if (!dentry)
1480 return -ENOMEM;
1481
1482 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1483 if (!inode)
1484 return -ENOMEM;
1485
1486 inode->i_fop = files[i].ops;
1487 inode->i_ino = ++sel_last_ino;
1488 d_add(dentry, inode);
1489 }
1490
1491 return 0;
1492}
1493
1494static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1495 size_t count, loff_t *ppos)
1496{
1497 char *con;
1498 u32 sid, len;
1499 ssize_t ret;
1500
1501 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1502 ret = security_sid_to_context(sid, &con, &len);
1503 if (ret)
1504 return ret;
1505
1506 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1507 kfree(con);
1508 return ret;
1509}
1510
1511static const struct file_operations sel_initcon_ops = {
1512 .read = sel_read_initcon,
1513 .llseek = generic_file_llseek,
1514};
1515
1516static int sel_make_initcon_files(struct dentry *dir)
1517{
1518 int i;
1519
1520 for (i = 1; i <= SECINITSID_NUM; i++) {
1521 struct inode *inode;
1522 struct dentry *dentry;
1523 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1524 if (!dentry)
1525 return -ENOMEM;
1526
1527 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1528 if (!inode)
1529 return -ENOMEM;
1530
1531 inode->i_fop = &sel_initcon_ops;
1532 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1533 d_add(dentry, inode);
1534 }
1535
1536 return 0;
1537}
1538
1539static inline unsigned long sel_class_to_ino(u16 class)
1540{
1541 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1542}
1543
1544static inline u16 sel_ino_to_class(unsigned long ino)
1545{
1546 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1547}
1548
1549static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1550{
1551 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1552}
1553
1554static inline u32 sel_ino_to_perm(unsigned long ino)
1555{
1556 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1557}
1558
1559static ssize_t sel_read_class(struct file *file, char __user *buf,
1560 size_t count, loff_t *ppos)
1561{
1562 unsigned long ino = file_inode(file)->i_ino;
1563 char res[TMPBUFLEN];
1564 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1565 return simple_read_from_buffer(buf, count, ppos, res, len);
1566}
1567
1568static const struct file_operations sel_class_ops = {
1569 .read = sel_read_class,
1570 .llseek = generic_file_llseek,
1571};
1572
1573static ssize_t sel_read_perm(struct file *file, char __user *buf,
1574 size_t count, loff_t *ppos)
1575{
1576 unsigned long ino = file_inode(file)->i_ino;
1577 char res[TMPBUFLEN];
1578 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1579 return simple_read_from_buffer(buf, count, ppos, res, len);
1580}
1581
1582static const struct file_operations sel_perm_ops = {
1583 .read = sel_read_perm,
1584 .llseek = generic_file_llseek,
1585};
1586
1587static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1588 size_t count, loff_t *ppos)
1589{
1590 int value;
1591 char tmpbuf[TMPBUFLEN];
1592 ssize_t length;
1593 unsigned long i_ino = file_inode(file)->i_ino;
1594
1595 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1596 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1597
1598 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1599}
1600
1601static const struct file_operations sel_policycap_ops = {
1602 .read = sel_read_policycap,
1603 .llseek = generic_file_llseek,
1604};
1605
1606static int sel_make_perm_files(char *objclass, int classvalue,
1607 struct dentry *dir)
1608{
1609 int i, rc, nperms;
1610 char **perms;
1611
1612 rc = security_get_permissions(objclass, &perms, &nperms);
1613 if (rc)
1614 return rc;
1615
1616 for (i = 0; i < nperms; i++) {
1617 struct inode *inode;
1618 struct dentry *dentry;
1619
1620 rc = -ENOMEM;
1621 dentry = d_alloc_name(dir, perms[i]);
1622 if (!dentry)
1623 goto out;
1624
1625 rc = -ENOMEM;
1626 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1627 if (!inode)
1628 goto out;
1629
1630 inode->i_fop = &sel_perm_ops;
1631 /* i+1 since perm values are 1-indexed */
1632 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1633 d_add(dentry, inode);
1634 }
1635 rc = 0;
1636out:
1637 for (i = 0; i < nperms; i++)
1638 kfree(perms[i]);
1639 kfree(perms);
1640 return rc;
1641}
1642
1643static int sel_make_class_dir_entries(char *classname, int index,
1644 struct dentry *dir)
1645{
1646 struct dentry *dentry = NULL;
1647 struct inode *inode = NULL;
1648 int rc;
1649
1650 dentry = d_alloc_name(dir, "index");
1651 if (!dentry)
1652 return -ENOMEM;
1653
1654 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1655 if (!inode)
1656 return -ENOMEM;
1657
1658 inode->i_fop = &sel_class_ops;
1659 inode->i_ino = sel_class_to_ino(index);
1660 d_add(dentry, inode);
1661
1662 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1663 if (IS_ERR(dentry))
1664 return PTR_ERR(dentry);
1665
1666 rc = sel_make_perm_files(classname, index, dentry);
1667
1668 return rc;
1669}
1670
1671static void sel_remove_classes(void)
1672{
1673 struct list_head *class_node;
1674
1675 list_for_each(class_node, &class_dir->d_subdirs) {
1676 struct dentry *class_subdir = list_entry(class_node,
1677 struct dentry, d_u.d_child);
1678 struct list_head *class_subdir_node;
1679
1680 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1681 struct dentry *d = list_entry(class_subdir_node,
1682 struct dentry, d_u.d_child);
1683
1684 if (d->d_inode)
1685 if (d->d_inode->i_mode & S_IFDIR)
1686 sel_remove_entries(d);
1687 }
1688
1689 sel_remove_entries(class_subdir);
1690 }
1691
1692 sel_remove_entries(class_dir);
1693}
1694
1695static int sel_make_classes(void)
1696{
1697 int rc, nclasses, i;
1698 char **classes;
1699
1700 /* delete any existing entries */
1701 sel_remove_classes();
1702
1703 rc = security_get_classes(&classes, &nclasses);
1704 if (rc)
1705 return rc;
1706
1707 /* +2 since classes are 1-indexed */
1708 last_class_ino = sel_class_to_ino(nclasses + 2);
1709
1710 for (i = 0; i < nclasses; i++) {
1711 struct dentry *class_name_dir;
1712
1713 class_name_dir = sel_make_dir(class_dir, classes[i],
1714 &last_class_ino);
1715 if (IS_ERR(class_name_dir)) {
1716 rc = PTR_ERR(class_name_dir);
1717 goto out;
1718 }
1719
1720 /* i+1 since class values are 1-indexed */
1721 rc = sel_make_class_dir_entries(classes[i], i + 1,
1722 class_name_dir);
1723 if (rc)
1724 goto out;
1725 }
1726 rc = 0;
1727out:
1728 for (i = 0; i < nclasses; i++)
1729 kfree(classes[i]);
1730 kfree(classes);
1731 return rc;
1732}
1733
1734static int sel_make_policycap(void)
1735{
1736 unsigned int iter;
1737 struct dentry *dentry = NULL;
1738 struct inode *inode = NULL;
1739
1740 sel_remove_entries(policycap_dir);
1741
1742 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1743 if (iter < ARRAY_SIZE(policycap_names))
1744 dentry = d_alloc_name(policycap_dir,
1745 policycap_names[iter]);
1746 else
1747 dentry = d_alloc_name(policycap_dir, "unknown");
1748
1749 if (dentry == NULL)
1750 return -ENOMEM;
1751
1752 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1753 if (inode == NULL)
1754 return -ENOMEM;
1755
1756 inode->i_fop = &sel_policycap_ops;
1757 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1758 d_add(dentry, inode);
1759 }
1760
1761 return 0;
1762}
1763
1764static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1765 unsigned long *ino)
1766{
1767 struct dentry *dentry = d_alloc_name(dir, name);
1768 struct inode *inode;
1769
1770 if (!dentry)
1771 return ERR_PTR(-ENOMEM);
1772
1773 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1774 if (!inode) {
1775 dput(dentry);
1776 return ERR_PTR(-ENOMEM);
1777 }
1778
1779 inode->i_op = &simple_dir_inode_operations;
1780 inode->i_fop = &simple_dir_operations;
1781 inode->i_ino = ++(*ino);
1782 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1783 inc_nlink(inode);
1784 d_add(dentry, inode);
1785 /* bump link count on parent directory, too */
1786 inc_nlink(dir->d_inode);
1787
1788 return dentry;
1789}
1790
1791static int sel_fill_super(struct super_block *sb, void *data, int silent)
1792{
1793 int ret;
1794 struct dentry *dentry;
1795 struct inode *inode;
1796 struct inode_security_struct *isec;
1797
1798 static struct tree_descr selinux_files[] = {
1799 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1800 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1801 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1802 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1804 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1806 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1807 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1808 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1809 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1810 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1811 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1812 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1813 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1814 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1815 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1816 /* last one */ {""}
1817 };
1818 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1819 if (ret)
1820 goto err;
1821
1822 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1823 if (IS_ERR(bool_dir)) {
1824 ret = PTR_ERR(bool_dir);
1825 bool_dir = NULL;
1826 goto err;
1827 }
1828
1829 ret = -ENOMEM;
1830 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1831 if (!dentry)
1832 goto err;
1833
1834 ret = -ENOMEM;
1835 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1836 if (!inode)
1837 goto err;
1838
1839 inode->i_ino = ++sel_last_ino;
1840 isec = (struct inode_security_struct *)inode->i_security;
1841 isec->sid = SECINITSID_DEVNULL;
1842 isec->sclass = SECCLASS_CHR_FILE;
1843 isec->initialized = 1;
1844
1845 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1846 d_add(dentry, inode);
1847 selinux_null.dentry = dentry;
1848
1849 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1850 if (IS_ERR(dentry)) {
1851 ret = PTR_ERR(dentry);
1852 goto err;
1853 }
1854
1855 ret = sel_make_avc_files(dentry);
1856 if (ret)
1857 goto err;
1858
1859 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1860 if (IS_ERR(dentry)) {
1861 ret = PTR_ERR(dentry);
1862 goto err;
1863 }
1864
1865 ret = sel_make_initcon_files(dentry);
1866 if (ret)
1867 goto err;
1868
1869 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1870 if (IS_ERR(class_dir)) {
1871 ret = PTR_ERR(class_dir);
1872 class_dir = NULL;
1873 goto err;
1874 }
1875
1876 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1877 if (IS_ERR(policycap_dir)) {
1878 ret = PTR_ERR(policycap_dir);
1879 policycap_dir = NULL;
1880 goto err;
1881 }
1882 return 0;
1883err:
1884 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1885 __func__);
1886 return ret;
1887}
1888
1889static struct dentry *sel_mount(struct file_system_type *fs_type,
1890 int flags, const char *dev_name, void *data)
1891{
1892 return mount_single(fs_type, flags, data, sel_fill_super);
1893}
1894
1895static struct file_system_type sel_fs_type = {
1896 .name = "selinuxfs",
1897 .mount = sel_mount,
1898 .kill_sb = kill_litter_super,
1899};
1900
1901struct vfsmount *selinuxfs_mount;
1902static struct kobject *selinuxfs_kobj;
1903
1904static int __init init_sel_fs(void)
1905{
1906 int err;
1907
1908 if (!selinux_enabled)
1909 return 0;
1910
1911 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1912 if (!selinuxfs_kobj)
1913 return -ENOMEM;
1914
1915 err = register_filesystem(&sel_fs_type);
1916 if (err) {
1917 kobject_put(selinuxfs_kobj);
1918 return err;
1919 }
1920
1921 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1922 if (IS_ERR(selinuxfs_mount)) {
1923 printk(KERN_ERR "selinuxfs: could not mount!\n");
1924 err = PTR_ERR(selinuxfs_mount);
1925 selinuxfs_mount = NULL;
1926 }
1927
1928 return err;
1929}
1930
1931__initcall(init_sel_fs);
1932
1933#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1934void exit_sel_fs(void)
1935{
1936 kobject_put(selinuxfs_kobj);
1937 kern_unmount(selinuxfs_mount);
1938 unregister_filesystem(&sel_fs_type);
1939}
1940#endif
1// SPDX-License-Identifier: GPL-2.0-only
2/* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 *
4 * Added conditional policy language extensions
5 *
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 *
8 * Added support for the policy capability bitmap
9 *
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/pagemap.h>
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19#include <linux/fs.h>
20#include <linux/fs_context.h>
21#include <linux/mount.h>
22#include <linux/mutex.h>
23#include <linux/init.h>
24#include <linux/string.h>
25#include <linux/security.h>
26#include <linux/major.h>
27#include <linux/seq_file.h>
28#include <linux/percpu.h>
29#include <linux/audit.h>
30#include <linux/uaccess.h>
31#include <linux/kobject.h>
32#include <linux/ctype.h>
33
34/* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37#include "flask.h"
38#include "avc.h"
39#include "avc_ss.h"
40#include "security.h"
41#include "objsec.h"
42#include "conditional.h"
43
44enum sel_inos {
45 SEL_ROOT_INO = 2,
46 SEL_LOAD, /* load policy */
47 SEL_ENFORCE, /* get or set enforcing status */
48 SEL_CONTEXT, /* validate context */
49 SEL_ACCESS, /* compute access decision */
50 SEL_CREATE, /* compute create labeling decision */
51 SEL_RELABEL, /* compute relabeling decision */
52 SEL_USER, /* compute reachable user contexts */
53 SEL_POLICYVERS, /* return policy version for this kernel */
54 SEL_COMMIT_BOOLS, /* commit new boolean values */
55 SEL_MLS, /* return if MLS policy is enabled */
56 SEL_DISABLE, /* disable SELinux until next reboot */
57 SEL_MEMBER, /* compute polyinstantiation membership decision */
58 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
59 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
60 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
61 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
62 SEL_STATUS, /* export current status using mmap() */
63 SEL_POLICY, /* allow userspace to read the in kernel policy */
64 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
65 SEL_INO_NEXT, /* The next inode number to use */
66};
67
68struct selinux_fs_info {
69 struct dentry *bool_dir;
70 unsigned int bool_num;
71 char **bool_pending_names;
72 unsigned int *bool_pending_values;
73 struct dentry *class_dir;
74 unsigned long last_class_ino;
75 bool policy_opened;
76 struct dentry *policycap_dir;
77 struct mutex mutex;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
81};
82
83static int selinux_fs_info_create(struct super_block *sb)
84{
85 struct selinux_fs_info *fsi;
86
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
88 if (!fsi)
89 return -ENOMEM;
90
91 mutex_init(&fsi->mutex);
92 fsi->last_ino = SEL_INO_NEXT - 1;
93 fsi->state = &selinux_state;
94 fsi->sb = sb;
95 sb->s_fs_info = fsi;
96 return 0;
97}
98
99static void selinux_fs_info_free(struct super_block *sb)
100{
101 struct selinux_fs_info *fsi = sb->s_fs_info;
102 int i;
103
104 if (fsi) {
105 for (i = 0; i < fsi->bool_num; i++)
106 kfree(fsi->bool_pending_names[i]);
107 kfree(fsi->bool_pending_names);
108 kfree(fsi->bool_pending_values);
109 }
110 kfree(sb->s_fs_info);
111 sb->s_fs_info = NULL;
112}
113
114#define SEL_INITCON_INO_OFFSET 0x01000000
115#define SEL_BOOL_INO_OFFSET 0x02000000
116#define SEL_CLASS_INO_OFFSET 0x04000000
117#define SEL_POLICYCAP_INO_OFFSET 0x08000000
118#define SEL_INO_MASK 0x00ffffff
119
120#define TMPBUFLEN 12
121static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
122 size_t count, loff_t *ppos)
123{
124 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
125 char tmpbuf[TMPBUFLEN];
126 ssize_t length;
127
128 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
129 enforcing_enabled(fsi->state));
130 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
131}
132
133#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
134static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
135 size_t count, loff_t *ppos)
136
137{
138 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
139 struct selinux_state *state = fsi->state;
140 char *page = NULL;
141 ssize_t length;
142 int old_value, new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146
147 /* No partial writes. */
148 if (*ppos != 0)
149 return -EINVAL;
150
151 page = memdup_user_nul(buf, count);
152 if (IS_ERR(page))
153 return PTR_ERR(page);
154
155 length = -EINVAL;
156 if (sscanf(page, "%d", &new_value) != 1)
157 goto out;
158
159 new_value = !!new_value;
160
161 old_value = enforcing_enabled(state);
162 if (new_value != old_value) {
163 length = avc_has_perm(&selinux_state,
164 current_sid(), SECINITSID_SECURITY,
165 SECCLASS_SECURITY, SECURITY__SETENFORCE,
166 NULL);
167 if (length)
168 goto out;
169 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
171 " enabled=1 old-enabled=1 lsm=selinux res=1",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 enforcing_set(state, new_value);
176 if (new_value)
177 avc_ss_reset(state->avc, 0);
178 selnl_notify_setenforce(new_value);
179 selinux_status_update_setenforce(state, new_value);
180 if (!new_value)
181 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
182 }
183 length = count;
184out:
185 kfree(page);
186 return length;
187}
188#else
189#define sel_write_enforce NULL
190#endif
191
192static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
196};
197
198static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200{
201 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
202 struct selinux_state *state = fsi->state;
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = file_inode(filp)->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown(state) :
208 !security_get_allow_unknown(state);
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212}
213
214static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
217};
218
219static int sel_open_handle_status(struct inode *inode, struct file *filp)
220{
221 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
222 struct page *status = selinux_kernel_status_page(fsi->state);
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230}
231
232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234{
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242}
243
244static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246{
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264}
265
266static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271};
272
273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277{
278 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
279 char *page;
280 ssize_t length;
281 int new_value;
282 int enforcing;
283
284 /* NOTE: we are now officially considering runtime disable as
285 * deprecated, and using it will become increasingly painful
286 * (e.g. sleeping/blocking) as we progress through future
287 * kernel releases until eventually it is removed
288 */
289 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
290
291 if (count >= PAGE_SIZE)
292 return -ENOMEM;
293
294 /* No partial writes. */
295 if (*ppos != 0)
296 return -EINVAL;
297
298 page = memdup_user_nul(buf, count);
299 if (IS_ERR(page))
300 return PTR_ERR(page);
301
302 length = -EINVAL;
303 if (sscanf(page, "%d", &new_value) != 1)
304 goto out;
305
306 if (new_value) {
307 enforcing = enforcing_enabled(fsi->state);
308 length = selinux_disable(fsi->state);
309 if (length)
310 goto out;
311 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
312 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
313 " enabled=0 old-enabled=1 lsm=selinux res=1",
314 enforcing, enforcing,
315 from_kuid(&init_user_ns, audit_get_loginuid(current)),
316 audit_get_sessionid(current));
317 }
318
319 length = count;
320out:
321 kfree(page);
322 return length;
323}
324#else
325#define sel_write_disable NULL
326#endif
327
328static const struct file_operations sel_disable_ops = {
329 .write = sel_write_disable,
330 .llseek = generic_file_llseek,
331};
332
333static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
334 size_t count, loff_t *ppos)
335{
336 char tmpbuf[TMPBUFLEN];
337 ssize_t length;
338
339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
341}
342
343static const struct file_operations sel_policyvers_ops = {
344 .read = sel_read_policyvers,
345 .llseek = generic_file_llseek,
346};
347
348/* declaration for sel_write_load */
349static int sel_make_bools(struct selinux_fs_info *fsi);
350static int sel_make_classes(struct selinux_fs_info *fsi);
351static int sel_make_policycap(struct selinux_fs_info *fsi);
352
353/* declaration for sel_make_class_dirs */
354static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
355 unsigned long *ino);
356
357static ssize_t sel_read_mls(struct file *filp, char __user *buf,
358 size_t count, loff_t *ppos)
359{
360 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
361 char tmpbuf[TMPBUFLEN];
362 ssize_t length;
363
364 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
365 security_mls_enabled(fsi->state));
366 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
367}
368
369static const struct file_operations sel_mls_ops = {
370 .read = sel_read_mls,
371 .llseek = generic_file_llseek,
372};
373
374struct policy_load_memory {
375 size_t len;
376 void *data;
377};
378
379static int sel_open_policy(struct inode *inode, struct file *filp)
380{
381 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
382 struct selinux_state *state = fsi->state;
383 struct policy_load_memory *plm = NULL;
384 int rc;
385
386 BUG_ON(filp->private_data);
387
388 mutex_lock(&fsi->mutex);
389
390 rc = avc_has_perm(&selinux_state,
391 current_sid(), SECINITSID_SECURITY,
392 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
393 if (rc)
394 goto err;
395
396 rc = -EBUSY;
397 if (fsi->policy_opened)
398 goto err;
399
400 rc = -ENOMEM;
401 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
402 if (!plm)
403 goto err;
404
405 if (i_size_read(inode) != security_policydb_len(state)) {
406 inode_lock(inode);
407 i_size_write(inode, security_policydb_len(state));
408 inode_unlock(inode);
409 }
410
411 rc = security_read_policy(state, &plm->data, &plm->len);
412 if (rc)
413 goto err;
414
415 fsi->policy_opened = 1;
416
417 filp->private_data = plm;
418
419 mutex_unlock(&fsi->mutex);
420
421 return 0;
422err:
423 mutex_unlock(&fsi->mutex);
424
425 if (plm)
426 vfree(plm->data);
427 kfree(plm);
428 return rc;
429}
430
431static int sel_release_policy(struct inode *inode, struct file *filp)
432{
433 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
434 struct policy_load_memory *plm = filp->private_data;
435
436 BUG_ON(!plm);
437
438 fsi->policy_opened = 0;
439
440 vfree(plm->data);
441 kfree(plm);
442
443 return 0;
444}
445
446static ssize_t sel_read_policy(struct file *filp, char __user *buf,
447 size_t count, loff_t *ppos)
448{
449 struct policy_load_memory *plm = filp->private_data;
450 int ret;
451
452 ret = avc_has_perm(&selinux_state,
453 current_sid(), SECINITSID_SECURITY,
454 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
455 if (ret)
456 return ret;
457
458 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
459}
460
461static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
462{
463 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
464 unsigned long offset;
465 struct page *page;
466
467 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
468 return VM_FAULT_SIGBUS;
469
470 offset = vmf->pgoff << PAGE_SHIFT;
471 if (offset >= roundup(plm->len, PAGE_SIZE))
472 return VM_FAULT_SIGBUS;
473
474 page = vmalloc_to_page(plm->data + offset);
475 get_page(page);
476
477 vmf->page = page;
478
479 return 0;
480}
481
482static const struct vm_operations_struct sel_mmap_policy_ops = {
483 .fault = sel_mmap_policy_fault,
484 .page_mkwrite = sel_mmap_policy_fault,
485};
486
487static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
488{
489 if (vma->vm_flags & VM_SHARED) {
490 /* do not allow mprotect to make mapping writable */
491 vma->vm_flags &= ~VM_MAYWRITE;
492
493 if (vma->vm_flags & VM_WRITE)
494 return -EACCES;
495 }
496
497 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
498 vma->vm_ops = &sel_mmap_policy_ops;
499
500 return 0;
501}
502
503static const struct file_operations sel_policy_ops = {
504 .open = sel_open_policy,
505 .read = sel_read_policy,
506 .mmap = sel_mmap_policy,
507 .release = sel_release_policy,
508 .llseek = generic_file_llseek,
509};
510
511static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
512{
513 int ret;
514
515 ret = sel_make_bools(fsi);
516 if (ret) {
517 pr_err("SELinux: failed to load policy booleans\n");
518 return ret;
519 }
520
521 ret = sel_make_classes(fsi);
522 if (ret) {
523 pr_err("SELinux: failed to load policy classes\n");
524 return ret;
525 }
526
527 ret = sel_make_policycap(fsi);
528 if (ret) {
529 pr_err("SELinux: failed to load policy capabilities\n");
530 return ret;
531 }
532
533 return 0;
534}
535
536static ssize_t sel_write_load(struct file *file, const char __user *buf,
537 size_t count, loff_t *ppos)
538
539{
540 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
541 ssize_t length;
542 void *data = NULL;
543
544 mutex_lock(&fsi->mutex);
545
546 length = avc_has_perm(&selinux_state,
547 current_sid(), SECINITSID_SECURITY,
548 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
549 if (length)
550 goto out;
551
552 /* No partial writes. */
553 length = -EINVAL;
554 if (*ppos != 0)
555 goto out;
556
557 length = -ENOMEM;
558 data = vmalloc(count);
559 if (!data)
560 goto out;
561
562 length = -EFAULT;
563 if (copy_from_user(data, buf, count) != 0)
564 goto out;
565
566 length = security_load_policy(fsi->state, data, count);
567 if (length) {
568 pr_warn_ratelimited("SELinux: failed to load policy\n");
569 goto out;
570 }
571
572 length = sel_make_policy_nodes(fsi);
573 if (length)
574 goto out1;
575
576 length = count;
577
578out1:
579 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
580 "auid=%u ses=%u lsm=selinux res=1",
581 from_kuid(&init_user_ns, audit_get_loginuid(current)),
582 audit_get_sessionid(current));
583out:
584 mutex_unlock(&fsi->mutex);
585 vfree(data);
586 return length;
587}
588
589static const struct file_operations sel_load_ops = {
590 .write = sel_write_load,
591 .llseek = generic_file_llseek,
592};
593
594static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
595{
596 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
597 struct selinux_state *state = fsi->state;
598 char *canon = NULL;
599 u32 sid, len;
600 ssize_t length;
601
602 length = avc_has_perm(&selinux_state,
603 current_sid(), SECINITSID_SECURITY,
604 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
605 if (length)
606 goto out;
607
608 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
609 if (length)
610 goto out;
611
612 length = security_sid_to_context(state, sid, &canon, &len);
613 if (length)
614 goto out;
615
616 length = -ERANGE;
617 if (len > SIMPLE_TRANSACTION_LIMIT) {
618 pr_err("SELinux: %s: context size (%u) exceeds "
619 "payload max\n", __func__, len);
620 goto out;
621 }
622
623 memcpy(buf, canon, len);
624 length = len;
625out:
626 kfree(canon);
627 return length;
628}
629
630static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
631 size_t count, loff_t *ppos)
632{
633 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
634 char tmpbuf[TMPBUFLEN];
635 ssize_t length;
636
637 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
638 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
639}
640
641static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
642 size_t count, loff_t *ppos)
643{
644 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
645 char *page;
646 ssize_t length;
647 unsigned int new_value;
648
649 length = avc_has_perm(&selinux_state,
650 current_sid(), SECINITSID_SECURITY,
651 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
652 NULL);
653 if (length)
654 return length;
655
656 if (count >= PAGE_SIZE)
657 return -ENOMEM;
658
659 /* No partial writes. */
660 if (*ppos != 0)
661 return -EINVAL;
662
663 page = memdup_user_nul(buf, count);
664 if (IS_ERR(page))
665 return PTR_ERR(page);
666
667 length = -EINVAL;
668 if (sscanf(page, "%u", &new_value) != 1)
669 goto out;
670
671 if (new_value) {
672 char comm[sizeof(current->comm)];
673
674 memcpy(comm, current->comm, sizeof(comm));
675 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
676 comm, current->pid);
677 }
678
679 fsi->state->checkreqprot = new_value ? 1 : 0;
680 length = count;
681out:
682 kfree(page);
683 return length;
684}
685static const struct file_operations sel_checkreqprot_ops = {
686 .read = sel_read_checkreqprot,
687 .write = sel_write_checkreqprot,
688 .llseek = generic_file_llseek,
689};
690
691static ssize_t sel_write_validatetrans(struct file *file,
692 const char __user *buf,
693 size_t count, loff_t *ppos)
694{
695 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
696 struct selinux_state *state = fsi->state;
697 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
698 char *req = NULL;
699 u32 osid, nsid, tsid;
700 u16 tclass;
701 int rc;
702
703 rc = avc_has_perm(&selinux_state,
704 current_sid(), SECINITSID_SECURITY,
705 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
706 if (rc)
707 goto out;
708
709 rc = -ENOMEM;
710 if (count >= PAGE_SIZE)
711 goto out;
712
713 /* No partial writes. */
714 rc = -EINVAL;
715 if (*ppos != 0)
716 goto out;
717
718 req = memdup_user_nul(buf, count);
719 if (IS_ERR(req)) {
720 rc = PTR_ERR(req);
721 req = NULL;
722 goto out;
723 }
724
725 rc = -ENOMEM;
726 oldcon = kzalloc(count + 1, GFP_KERNEL);
727 if (!oldcon)
728 goto out;
729
730 newcon = kzalloc(count + 1, GFP_KERNEL);
731 if (!newcon)
732 goto out;
733
734 taskcon = kzalloc(count + 1, GFP_KERNEL);
735 if (!taskcon)
736 goto out;
737
738 rc = -EINVAL;
739 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
740 goto out;
741
742 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
743 if (rc)
744 goto out;
745
746 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
747 if (rc)
748 goto out;
749
750 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
751 if (rc)
752 goto out;
753
754 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
755 if (!rc)
756 rc = count;
757out:
758 kfree(req);
759 kfree(oldcon);
760 kfree(newcon);
761 kfree(taskcon);
762 return rc;
763}
764
765static const struct file_operations sel_transition_ops = {
766 .write = sel_write_validatetrans,
767 .llseek = generic_file_llseek,
768};
769
770/*
771 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
772 */
773static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
774static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
775static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
776static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
777static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
778
779static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
780 [SEL_ACCESS] = sel_write_access,
781 [SEL_CREATE] = sel_write_create,
782 [SEL_RELABEL] = sel_write_relabel,
783 [SEL_USER] = sel_write_user,
784 [SEL_MEMBER] = sel_write_member,
785 [SEL_CONTEXT] = sel_write_context,
786};
787
788static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
789{
790 ino_t ino = file_inode(file)->i_ino;
791 char *data;
792 ssize_t rv;
793
794 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
795 return -EINVAL;
796
797 data = simple_transaction_get(file, buf, size);
798 if (IS_ERR(data))
799 return PTR_ERR(data);
800
801 rv = write_op[ino](file, data, size);
802 if (rv > 0) {
803 simple_transaction_set(file, rv);
804 rv = size;
805 }
806 return rv;
807}
808
809static const struct file_operations transaction_ops = {
810 .write = selinux_transaction_write,
811 .read = simple_transaction_read,
812 .release = simple_transaction_release,
813 .llseek = generic_file_llseek,
814};
815
816/*
817 * payload - write methods
818 * If the method has a response, the response should be put in buf,
819 * and the length returned. Otherwise return 0 or and -error.
820 */
821
822static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
823{
824 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
825 struct selinux_state *state = fsi->state;
826 char *scon = NULL, *tcon = NULL;
827 u32 ssid, tsid;
828 u16 tclass;
829 struct av_decision avd;
830 ssize_t length;
831
832 length = avc_has_perm(&selinux_state,
833 current_sid(), SECINITSID_SECURITY,
834 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
835 if (length)
836 goto out;
837
838 length = -ENOMEM;
839 scon = kzalloc(size + 1, GFP_KERNEL);
840 if (!scon)
841 goto out;
842
843 length = -ENOMEM;
844 tcon = kzalloc(size + 1, GFP_KERNEL);
845 if (!tcon)
846 goto out;
847
848 length = -EINVAL;
849 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
850 goto out;
851
852 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
853 if (length)
854 goto out;
855
856 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
857 if (length)
858 goto out;
859
860 security_compute_av_user(state, ssid, tsid, tclass, &avd);
861
862 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
863 "%x %x %x %x %u %x",
864 avd.allowed, 0xffffffff,
865 avd.auditallow, avd.auditdeny,
866 avd.seqno, avd.flags);
867out:
868 kfree(tcon);
869 kfree(scon);
870 return length;
871}
872
873static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
874{
875 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
876 struct selinux_state *state = fsi->state;
877 char *scon = NULL, *tcon = NULL;
878 char *namebuf = NULL, *objname = NULL;
879 u32 ssid, tsid, newsid;
880 u16 tclass;
881 ssize_t length;
882 char *newcon = NULL;
883 u32 len;
884 int nargs;
885
886 length = avc_has_perm(&selinux_state,
887 current_sid(), SECINITSID_SECURITY,
888 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
889 NULL);
890 if (length)
891 goto out;
892
893 length = -ENOMEM;
894 scon = kzalloc(size + 1, GFP_KERNEL);
895 if (!scon)
896 goto out;
897
898 length = -ENOMEM;
899 tcon = kzalloc(size + 1, GFP_KERNEL);
900 if (!tcon)
901 goto out;
902
903 length = -ENOMEM;
904 namebuf = kzalloc(size + 1, GFP_KERNEL);
905 if (!namebuf)
906 goto out;
907
908 length = -EINVAL;
909 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
910 if (nargs < 3 || nargs > 4)
911 goto out;
912 if (nargs == 4) {
913 /*
914 * If and when the name of new object to be queried contains
915 * either whitespace or multibyte characters, they shall be
916 * encoded based on the percentage-encoding rule.
917 * If not encoded, the sscanf logic picks up only left-half
918 * of the supplied name; splitted by a whitespace unexpectedly.
919 */
920 char *r, *w;
921 int c1, c2;
922
923 r = w = namebuf;
924 do {
925 c1 = *r++;
926 if (c1 == '+')
927 c1 = ' ';
928 else if (c1 == '%') {
929 c1 = hex_to_bin(*r++);
930 if (c1 < 0)
931 goto out;
932 c2 = hex_to_bin(*r++);
933 if (c2 < 0)
934 goto out;
935 c1 = (c1 << 4) | c2;
936 }
937 *w++ = c1;
938 } while (c1 != '\0');
939
940 objname = namebuf;
941 }
942
943 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
944 if (length)
945 goto out;
946
947 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
948 if (length)
949 goto out;
950
951 length = security_transition_sid_user(state, ssid, tsid, tclass,
952 objname, &newsid);
953 if (length)
954 goto out;
955
956 length = security_sid_to_context(state, newsid, &newcon, &len);
957 if (length)
958 goto out;
959
960 length = -ERANGE;
961 if (len > SIMPLE_TRANSACTION_LIMIT) {
962 pr_err("SELinux: %s: context size (%u) exceeds "
963 "payload max\n", __func__, len);
964 goto out;
965 }
966
967 memcpy(buf, newcon, len);
968 length = len;
969out:
970 kfree(newcon);
971 kfree(namebuf);
972 kfree(tcon);
973 kfree(scon);
974 return length;
975}
976
977static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
978{
979 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
980 struct selinux_state *state = fsi->state;
981 char *scon = NULL, *tcon = NULL;
982 u32 ssid, tsid, newsid;
983 u16 tclass;
984 ssize_t length;
985 char *newcon = NULL;
986 u32 len;
987
988 length = avc_has_perm(&selinux_state,
989 current_sid(), SECINITSID_SECURITY,
990 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
991 NULL);
992 if (length)
993 goto out;
994
995 length = -ENOMEM;
996 scon = kzalloc(size + 1, GFP_KERNEL);
997 if (!scon)
998 goto out;
999
1000 length = -ENOMEM;
1001 tcon = kzalloc(size + 1, GFP_KERNEL);
1002 if (!tcon)
1003 goto out;
1004
1005 length = -EINVAL;
1006 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1007 goto out;
1008
1009 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1010 if (length)
1011 goto out;
1012
1013 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1014 if (length)
1015 goto out;
1016
1017 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1018 if (length)
1019 goto out;
1020
1021 length = security_sid_to_context(state, newsid, &newcon, &len);
1022 if (length)
1023 goto out;
1024
1025 length = -ERANGE;
1026 if (len > SIMPLE_TRANSACTION_LIMIT)
1027 goto out;
1028
1029 memcpy(buf, newcon, len);
1030 length = len;
1031out:
1032 kfree(newcon);
1033 kfree(tcon);
1034 kfree(scon);
1035 return length;
1036}
1037
1038static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1039{
1040 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1041 struct selinux_state *state = fsi->state;
1042 char *con = NULL, *user = NULL, *ptr;
1043 u32 sid, *sids = NULL;
1044 ssize_t length;
1045 char *newcon;
1046 int i, rc;
1047 u32 len, nsids;
1048
1049 length = avc_has_perm(&selinux_state,
1050 current_sid(), SECINITSID_SECURITY,
1051 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1052 NULL);
1053 if (length)
1054 goto out;
1055
1056 length = -ENOMEM;
1057 con = kzalloc(size + 1, GFP_KERNEL);
1058 if (!con)
1059 goto out;
1060
1061 length = -ENOMEM;
1062 user = kzalloc(size + 1, GFP_KERNEL);
1063 if (!user)
1064 goto out;
1065
1066 length = -EINVAL;
1067 if (sscanf(buf, "%s %s", con, user) != 2)
1068 goto out;
1069
1070 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1071 if (length)
1072 goto out;
1073
1074 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1075 if (length)
1076 goto out;
1077
1078 length = sprintf(buf, "%u", nsids) + 1;
1079 ptr = buf + length;
1080 for (i = 0; i < nsids; i++) {
1081 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1082 if (rc) {
1083 length = rc;
1084 goto out;
1085 }
1086 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1087 kfree(newcon);
1088 length = -ERANGE;
1089 goto out;
1090 }
1091 memcpy(ptr, newcon, len);
1092 kfree(newcon);
1093 ptr += len;
1094 length += len;
1095 }
1096out:
1097 kfree(sids);
1098 kfree(user);
1099 kfree(con);
1100 return length;
1101}
1102
1103static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1104{
1105 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1106 struct selinux_state *state = fsi->state;
1107 char *scon = NULL, *tcon = NULL;
1108 u32 ssid, tsid, newsid;
1109 u16 tclass;
1110 ssize_t length;
1111 char *newcon = NULL;
1112 u32 len;
1113
1114 length = avc_has_perm(&selinux_state,
1115 current_sid(), SECINITSID_SECURITY,
1116 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1117 NULL);
1118 if (length)
1119 goto out;
1120
1121 length = -ENOMEM;
1122 scon = kzalloc(size + 1, GFP_KERNEL);
1123 if (!scon)
1124 goto out;
1125
1126 length = -ENOMEM;
1127 tcon = kzalloc(size + 1, GFP_KERNEL);
1128 if (!tcon)
1129 goto out;
1130
1131 length = -EINVAL;
1132 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1133 goto out;
1134
1135 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1136 if (length)
1137 goto out;
1138
1139 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1140 if (length)
1141 goto out;
1142
1143 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1144 if (length)
1145 goto out;
1146
1147 length = security_sid_to_context(state, newsid, &newcon, &len);
1148 if (length)
1149 goto out;
1150
1151 length = -ERANGE;
1152 if (len > SIMPLE_TRANSACTION_LIMIT) {
1153 pr_err("SELinux: %s: context size (%u) exceeds "
1154 "payload max\n", __func__, len);
1155 goto out;
1156 }
1157
1158 memcpy(buf, newcon, len);
1159 length = len;
1160out:
1161 kfree(newcon);
1162 kfree(tcon);
1163 kfree(scon);
1164 return length;
1165}
1166
1167static struct inode *sel_make_inode(struct super_block *sb, int mode)
1168{
1169 struct inode *ret = new_inode(sb);
1170
1171 if (ret) {
1172 ret->i_mode = mode;
1173 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1174 }
1175 return ret;
1176}
1177
1178static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1179 size_t count, loff_t *ppos)
1180{
1181 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1182 char *page = NULL;
1183 ssize_t length;
1184 ssize_t ret;
1185 int cur_enforcing;
1186 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1187 const char *name = filep->f_path.dentry->d_name.name;
1188
1189 mutex_lock(&fsi->mutex);
1190
1191 ret = -EINVAL;
1192 if (index >= fsi->bool_num || strcmp(name,
1193 fsi->bool_pending_names[index]))
1194 goto out_unlock;
1195
1196 ret = -ENOMEM;
1197 page = (char *)get_zeroed_page(GFP_KERNEL);
1198 if (!page)
1199 goto out_unlock;
1200
1201 cur_enforcing = security_get_bool_value(fsi->state, index);
1202 if (cur_enforcing < 0) {
1203 ret = cur_enforcing;
1204 goto out_unlock;
1205 }
1206 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1207 fsi->bool_pending_values[index]);
1208 mutex_unlock(&fsi->mutex);
1209 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1210out_free:
1211 free_page((unsigned long)page);
1212 return ret;
1213
1214out_unlock:
1215 mutex_unlock(&fsi->mutex);
1216 goto out_free;
1217}
1218
1219static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1220 size_t count, loff_t *ppos)
1221{
1222 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1223 char *page = NULL;
1224 ssize_t length;
1225 int new_value;
1226 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1227 const char *name = filep->f_path.dentry->d_name.name;
1228
1229 if (count >= PAGE_SIZE)
1230 return -ENOMEM;
1231
1232 /* No partial writes. */
1233 if (*ppos != 0)
1234 return -EINVAL;
1235
1236 page = memdup_user_nul(buf, count);
1237 if (IS_ERR(page))
1238 return PTR_ERR(page);
1239
1240 mutex_lock(&fsi->mutex);
1241
1242 length = avc_has_perm(&selinux_state,
1243 current_sid(), SECINITSID_SECURITY,
1244 SECCLASS_SECURITY, SECURITY__SETBOOL,
1245 NULL);
1246 if (length)
1247 goto out;
1248
1249 length = -EINVAL;
1250 if (index >= fsi->bool_num || strcmp(name,
1251 fsi->bool_pending_names[index]))
1252 goto out;
1253
1254 length = -EINVAL;
1255 if (sscanf(page, "%d", &new_value) != 1)
1256 goto out;
1257
1258 if (new_value)
1259 new_value = 1;
1260
1261 fsi->bool_pending_values[index] = new_value;
1262 length = count;
1263
1264out:
1265 mutex_unlock(&fsi->mutex);
1266 kfree(page);
1267 return length;
1268}
1269
1270static const struct file_operations sel_bool_ops = {
1271 .read = sel_read_bool,
1272 .write = sel_write_bool,
1273 .llseek = generic_file_llseek,
1274};
1275
1276static ssize_t sel_commit_bools_write(struct file *filep,
1277 const char __user *buf,
1278 size_t count, loff_t *ppos)
1279{
1280 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1281 char *page = NULL;
1282 ssize_t length;
1283 int new_value;
1284
1285 if (count >= PAGE_SIZE)
1286 return -ENOMEM;
1287
1288 /* No partial writes. */
1289 if (*ppos != 0)
1290 return -EINVAL;
1291
1292 page = memdup_user_nul(buf, count);
1293 if (IS_ERR(page))
1294 return PTR_ERR(page);
1295
1296 mutex_lock(&fsi->mutex);
1297
1298 length = avc_has_perm(&selinux_state,
1299 current_sid(), SECINITSID_SECURITY,
1300 SECCLASS_SECURITY, SECURITY__SETBOOL,
1301 NULL);
1302 if (length)
1303 goto out;
1304
1305 length = -EINVAL;
1306 if (sscanf(page, "%d", &new_value) != 1)
1307 goto out;
1308
1309 length = 0;
1310 if (new_value && fsi->bool_pending_values)
1311 length = security_set_bools(fsi->state, fsi->bool_num,
1312 fsi->bool_pending_values);
1313
1314 if (!length)
1315 length = count;
1316
1317out:
1318 mutex_unlock(&fsi->mutex);
1319 kfree(page);
1320 return length;
1321}
1322
1323static const struct file_operations sel_commit_bools_ops = {
1324 .write = sel_commit_bools_write,
1325 .llseek = generic_file_llseek,
1326};
1327
1328static void sel_remove_entries(struct dentry *de)
1329{
1330 d_genocide(de);
1331 shrink_dcache_parent(de);
1332}
1333
1334#define BOOL_DIR_NAME "booleans"
1335
1336static int sel_make_bools(struct selinux_fs_info *fsi)
1337{
1338 int ret;
1339 ssize_t len;
1340 struct dentry *dentry = NULL;
1341 struct dentry *dir = fsi->bool_dir;
1342 struct inode *inode = NULL;
1343 struct inode_security_struct *isec;
1344 char **names = NULL, *page;
1345 u32 i, num;
1346 int *values = NULL;
1347 u32 sid;
1348
1349 /* remove any existing files */
1350 for (i = 0; i < fsi->bool_num; i++)
1351 kfree(fsi->bool_pending_names[i]);
1352 kfree(fsi->bool_pending_names);
1353 kfree(fsi->bool_pending_values);
1354 fsi->bool_num = 0;
1355 fsi->bool_pending_names = NULL;
1356 fsi->bool_pending_values = NULL;
1357
1358 sel_remove_entries(dir);
1359
1360 ret = -ENOMEM;
1361 page = (char *)get_zeroed_page(GFP_KERNEL);
1362 if (!page)
1363 goto out;
1364
1365 ret = security_get_bools(fsi->state, &num, &names, &values);
1366 if (ret)
1367 goto out;
1368
1369 for (i = 0; i < num; i++) {
1370 ret = -ENOMEM;
1371 dentry = d_alloc_name(dir, names[i]);
1372 if (!dentry)
1373 goto out;
1374
1375 ret = -ENOMEM;
1376 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1377 if (!inode) {
1378 dput(dentry);
1379 goto out;
1380 }
1381
1382 ret = -ENAMETOOLONG;
1383 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1384 if (len >= PAGE_SIZE) {
1385 dput(dentry);
1386 iput(inode);
1387 goto out;
1388 }
1389
1390 isec = selinux_inode(inode);
1391 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1392 SECCLASS_FILE, &sid);
1393 if (ret) {
1394 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1395 page);
1396 sid = SECINITSID_SECURITY;
1397 }
1398
1399 isec->sid = sid;
1400 isec->initialized = LABEL_INITIALIZED;
1401 inode->i_fop = &sel_bool_ops;
1402 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1403 d_add(dentry, inode);
1404 }
1405 fsi->bool_num = num;
1406 fsi->bool_pending_names = names;
1407 fsi->bool_pending_values = values;
1408
1409 free_page((unsigned long)page);
1410 return 0;
1411out:
1412 free_page((unsigned long)page);
1413
1414 if (names) {
1415 for (i = 0; i < num; i++)
1416 kfree(names[i]);
1417 kfree(names);
1418 }
1419 kfree(values);
1420 sel_remove_entries(dir);
1421
1422 return ret;
1423}
1424
1425static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1426 size_t count, loff_t *ppos)
1427{
1428 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1429 struct selinux_state *state = fsi->state;
1430 char tmpbuf[TMPBUFLEN];
1431 ssize_t length;
1432
1433 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1434 avc_get_cache_threshold(state->avc));
1435 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1436}
1437
1438static ssize_t sel_write_avc_cache_threshold(struct file *file,
1439 const char __user *buf,
1440 size_t count, loff_t *ppos)
1441
1442{
1443 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1444 struct selinux_state *state = fsi->state;
1445 char *page;
1446 ssize_t ret;
1447 unsigned int new_value;
1448
1449 ret = avc_has_perm(&selinux_state,
1450 current_sid(), SECINITSID_SECURITY,
1451 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1452 NULL);
1453 if (ret)
1454 return ret;
1455
1456 if (count >= PAGE_SIZE)
1457 return -ENOMEM;
1458
1459 /* No partial writes. */
1460 if (*ppos != 0)
1461 return -EINVAL;
1462
1463 page = memdup_user_nul(buf, count);
1464 if (IS_ERR(page))
1465 return PTR_ERR(page);
1466
1467 ret = -EINVAL;
1468 if (sscanf(page, "%u", &new_value) != 1)
1469 goto out;
1470
1471 avc_set_cache_threshold(state->avc, new_value);
1472
1473 ret = count;
1474out:
1475 kfree(page);
1476 return ret;
1477}
1478
1479static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1480 size_t count, loff_t *ppos)
1481{
1482 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1483 struct selinux_state *state = fsi->state;
1484 char *page;
1485 ssize_t length;
1486
1487 page = (char *)__get_free_page(GFP_KERNEL);
1488 if (!page)
1489 return -ENOMEM;
1490
1491 length = avc_get_hash_stats(state->avc, page);
1492 if (length >= 0)
1493 length = simple_read_from_buffer(buf, count, ppos, page, length);
1494 free_page((unsigned long)page);
1495
1496 return length;
1497}
1498
1499static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1500 size_t count, loff_t *ppos)
1501{
1502 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1503 struct selinux_state *state = fsi->state;
1504 char *page;
1505 ssize_t length;
1506
1507 page = (char *)__get_free_page(GFP_KERNEL);
1508 if (!page)
1509 return -ENOMEM;
1510
1511 length = security_sidtab_hash_stats(state, page);
1512 if (length >= 0)
1513 length = simple_read_from_buffer(buf, count, ppos, page,
1514 length);
1515 free_page((unsigned long)page);
1516
1517 return length;
1518}
1519
1520static const struct file_operations sel_sidtab_hash_stats_ops = {
1521 .read = sel_read_sidtab_hash_stats,
1522 .llseek = generic_file_llseek,
1523};
1524
1525static const struct file_operations sel_avc_cache_threshold_ops = {
1526 .read = sel_read_avc_cache_threshold,
1527 .write = sel_write_avc_cache_threshold,
1528 .llseek = generic_file_llseek,
1529};
1530
1531static const struct file_operations sel_avc_hash_stats_ops = {
1532 .read = sel_read_avc_hash_stats,
1533 .llseek = generic_file_llseek,
1534};
1535
1536#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1537static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1538{
1539 int cpu;
1540
1541 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1542 if (!cpu_possible(cpu))
1543 continue;
1544 *idx = cpu + 1;
1545 return &per_cpu(avc_cache_stats, cpu);
1546 }
1547 (*idx)++;
1548 return NULL;
1549}
1550
1551static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1552{
1553 loff_t n = *pos - 1;
1554
1555 if (*pos == 0)
1556 return SEQ_START_TOKEN;
1557
1558 return sel_avc_get_stat_idx(&n);
1559}
1560
1561static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1562{
1563 return sel_avc_get_stat_idx(pos);
1564}
1565
1566static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1567{
1568 struct avc_cache_stats *st = v;
1569
1570 if (v == SEQ_START_TOKEN) {
1571 seq_puts(seq,
1572 "lookups hits misses allocations reclaims frees\n");
1573 } else {
1574 unsigned int lookups = st->lookups;
1575 unsigned int misses = st->misses;
1576 unsigned int hits = lookups - misses;
1577 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1578 hits, misses, st->allocations,
1579 st->reclaims, st->frees);
1580 }
1581 return 0;
1582}
1583
1584static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1585{ }
1586
1587static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1588 .start = sel_avc_stats_seq_start,
1589 .next = sel_avc_stats_seq_next,
1590 .show = sel_avc_stats_seq_show,
1591 .stop = sel_avc_stats_seq_stop,
1592};
1593
1594static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1595{
1596 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1597}
1598
1599static const struct file_operations sel_avc_cache_stats_ops = {
1600 .open = sel_open_avc_cache_stats,
1601 .read = seq_read,
1602 .llseek = seq_lseek,
1603 .release = seq_release,
1604};
1605#endif
1606
1607static int sel_make_avc_files(struct dentry *dir)
1608{
1609 struct super_block *sb = dir->d_sb;
1610 struct selinux_fs_info *fsi = sb->s_fs_info;
1611 int i;
1612 static const struct tree_descr files[] = {
1613 { "cache_threshold",
1614 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1615 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1616#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1617 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1618#endif
1619 };
1620
1621 for (i = 0; i < ARRAY_SIZE(files); i++) {
1622 struct inode *inode;
1623 struct dentry *dentry;
1624
1625 dentry = d_alloc_name(dir, files[i].name);
1626 if (!dentry)
1627 return -ENOMEM;
1628
1629 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1630 if (!inode) {
1631 dput(dentry);
1632 return -ENOMEM;
1633 }
1634
1635 inode->i_fop = files[i].ops;
1636 inode->i_ino = ++fsi->last_ino;
1637 d_add(dentry, inode);
1638 }
1639
1640 return 0;
1641}
1642
1643static int sel_make_ss_files(struct dentry *dir)
1644{
1645 struct super_block *sb = dir->d_sb;
1646 struct selinux_fs_info *fsi = sb->s_fs_info;
1647 int i;
1648 static struct tree_descr files[] = {
1649 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1650 };
1651
1652 for (i = 0; i < ARRAY_SIZE(files); i++) {
1653 struct inode *inode;
1654 struct dentry *dentry;
1655
1656 dentry = d_alloc_name(dir, files[i].name);
1657 if (!dentry)
1658 return -ENOMEM;
1659
1660 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1661 if (!inode) {
1662 dput(dentry);
1663 return -ENOMEM;
1664 }
1665
1666 inode->i_fop = files[i].ops;
1667 inode->i_ino = ++fsi->last_ino;
1668 d_add(dentry, inode);
1669 }
1670
1671 return 0;
1672}
1673
1674static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1675 size_t count, loff_t *ppos)
1676{
1677 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1678 char *con;
1679 u32 sid, len;
1680 ssize_t ret;
1681
1682 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1683 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1684 if (ret)
1685 return ret;
1686
1687 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1688 kfree(con);
1689 return ret;
1690}
1691
1692static const struct file_operations sel_initcon_ops = {
1693 .read = sel_read_initcon,
1694 .llseek = generic_file_llseek,
1695};
1696
1697static int sel_make_initcon_files(struct dentry *dir)
1698{
1699 int i;
1700
1701 for (i = 1; i <= SECINITSID_NUM; i++) {
1702 struct inode *inode;
1703 struct dentry *dentry;
1704 const char *s = security_get_initial_sid_context(i);
1705
1706 if (!s)
1707 continue;
1708 dentry = d_alloc_name(dir, s);
1709 if (!dentry)
1710 return -ENOMEM;
1711
1712 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1713 if (!inode) {
1714 dput(dentry);
1715 return -ENOMEM;
1716 }
1717
1718 inode->i_fop = &sel_initcon_ops;
1719 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1720 d_add(dentry, inode);
1721 }
1722
1723 return 0;
1724}
1725
1726static inline unsigned long sel_class_to_ino(u16 class)
1727{
1728 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1729}
1730
1731static inline u16 sel_ino_to_class(unsigned long ino)
1732{
1733 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1734}
1735
1736static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1737{
1738 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1739}
1740
1741static inline u32 sel_ino_to_perm(unsigned long ino)
1742{
1743 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1744}
1745
1746static ssize_t sel_read_class(struct file *file, char __user *buf,
1747 size_t count, loff_t *ppos)
1748{
1749 unsigned long ino = file_inode(file)->i_ino;
1750 char res[TMPBUFLEN];
1751 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1752 return simple_read_from_buffer(buf, count, ppos, res, len);
1753}
1754
1755static const struct file_operations sel_class_ops = {
1756 .read = sel_read_class,
1757 .llseek = generic_file_llseek,
1758};
1759
1760static ssize_t sel_read_perm(struct file *file, char __user *buf,
1761 size_t count, loff_t *ppos)
1762{
1763 unsigned long ino = file_inode(file)->i_ino;
1764 char res[TMPBUFLEN];
1765 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1766 return simple_read_from_buffer(buf, count, ppos, res, len);
1767}
1768
1769static const struct file_operations sel_perm_ops = {
1770 .read = sel_read_perm,
1771 .llseek = generic_file_llseek,
1772};
1773
1774static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1775 size_t count, loff_t *ppos)
1776{
1777 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1778 int value;
1779 char tmpbuf[TMPBUFLEN];
1780 ssize_t length;
1781 unsigned long i_ino = file_inode(file)->i_ino;
1782
1783 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1784 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1785
1786 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1787}
1788
1789static const struct file_operations sel_policycap_ops = {
1790 .read = sel_read_policycap,
1791 .llseek = generic_file_llseek,
1792};
1793
1794static int sel_make_perm_files(char *objclass, int classvalue,
1795 struct dentry *dir)
1796{
1797 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1798 int i, rc, nperms;
1799 char **perms;
1800
1801 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1802 if (rc)
1803 return rc;
1804
1805 for (i = 0; i < nperms; i++) {
1806 struct inode *inode;
1807 struct dentry *dentry;
1808
1809 rc = -ENOMEM;
1810 dentry = d_alloc_name(dir, perms[i]);
1811 if (!dentry)
1812 goto out;
1813
1814 rc = -ENOMEM;
1815 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1816 if (!inode) {
1817 dput(dentry);
1818 goto out;
1819 }
1820
1821 inode->i_fop = &sel_perm_ops;
1822 /* i+1 since perm values are 1-indexed */
1823 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1824 d_add(dentry, inode);
1825 }
1826 rc = 0;
1827out:
1828 for (i = 0; i < nperms; i++)
1829 kfree(perms[i]);
1830 kfree(perms);
1831 return rc;
1832}
1833
1834static int sel_make_class_dir_entries(char *classname, int index,
1835 struct dentry *dir)
1836{
1837 struct super_block *sb = dir->d_sb;
1838 struct selinux_fs_info *fsi = sb->s_fs_info;
1839 struct dentry *dentry = NULL;
1840 struct inode *inode = NULL;
1841 int rc;
1842
1843 dentry = d_alloc_name(dir, "index");
1844 if (!dentry)
1845 return -ENOMEM;
1846
1847 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1848 if (!inode) {
1849 dput(dentry);
1850 return -ENOMEM;
1851 }
1852
1853 inode->i_fop = &sel_class_ops;
1854 inode->i_ino = sel_class_to_ino(index);
1855 d_add(dentry, inode);
1856
1857 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1858 if (IS_ERR(dentry))
1859 return PTR_ERR(dentry);
1860
1861 rc = sel_make_perm_files(classname, index, dentry);
1862
1863 return rc;
1864}
1865
1866static int sel_make_classes(struct selinux_fs_info *fsi)
1867{
1868
1869 int rc, nclasses, i;
1870 char **classes;
1871
1872 /* delete any existing entries */
1873 sel_remove_entries(fsi->class_dir);
1874
1875 rc = security_get_classes(fsi->state, &classes, &nclasses);
1876 if (rc)
1877 return rc;
1878
1879 /* +2 since classes are 1-indexed */
1880 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1881
1882 for (i = 0; i < nclasses; i++) {
1883 struct dentry *class_name_dir;
1884
1885 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1886 &fsi->last_class_ino);
1887 if (IS_ERR(class_name_dir)) {
1888 rc = PTR_ERR(class_name_dir);
1889 goto out;
1890 }
1891
1892 /* i+1 since class values are 1-indexed */
1893 rc = sel_make_class_dir_entries(classes[i], i + 1,
1894 class_name_dir);
1895 if (rc)
1896 goto out;
1897 }
1898 rc = 0;
1899out:
1900 for (i = 0; i < nclasses; i++)
1901 kfree(classes[i]);
1902 kfree(classes);
1903 return rc;
1904}
1905
1906static int sel_make_policycap(struct selinux_fs_info *fsi)
1907{
1908 unsigned int iter;
1909 struct dentry *dentry = NULL;
1910 struct inode *inode = NULL;
1911
1912 sel_remove_entries(fsi->policycap_dir);
1913
1914 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1915 if (iter < ARRAY_SIZE(selinux_policycap_names))
1916 dentry = d_alloc_name(fsi->policycap_dir,
1917 selinux_policycap_names[iter]);
1918 else
1919 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1920
1921 if (dentry == NULL)
1922 return -ENOMEM;
1923
1924 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1925 if (inode == NULL) {
1926 dput(dentry);
1927 return -ENOMEM;
1928 }
1929
1930 inode->i_fop = &sel_policycap_ops;
1931 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1932 d_add(dentry, inode);
1933 }
1934
1935 return 0;
1936}
1937
1938static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1939 unsigned long *ino)
1940{
1941 struct dentry *dentry = d_alloc_name(dir, name);
1942 struct inode *inode;
1943
1944 if (!dentry)
1945 return ERR_PTR(-ENOMEM);
1946
1947 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1948 if (!inode) {
1949 dput(dentry);
1950 return ERR_PTR(-ENOMEM);
1951 }
1952
1953 inode->i_op = &simple_dir_inode_operations;
1954 inode->i_fop = &simple_dir_operations;
1955 inode->i_ino = ++(*ino);
1956 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1957 inc_nlink(inode);
1958 d_add(dentry, inode);
1959 /* bump link count on parent directory, too */
1960 inc_nlink(d_inode(dir));
1961
1962 return dentry;
1963}
1964
1965#define NULL_FILE_NAME "null"
1966
1967static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1968{
1969 struct selinux_fs_info *fsi;
1970 int ret;
1971 struct dentry *dentry;
1972 struct inode *inode;
1973 struct inode_security_struct *isec;
1974
1975 static const struct tree_descr selinux_files[] = {
1976 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1977 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1978 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1979 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1980 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1981 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1982 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1983 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1984 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1985 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1986 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1987 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1988 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1989 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1990 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1991 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1992 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1993 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1994 S_IWUGO},
1995 /* last one */ {""}
1996 };
1997
1998 ret = selinux_fs_info_create(sb);
1999 if (ret)
2000 goto err;
2001
2002 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2003 if (ret)
2004 goto err;
2005
2006 fsi = sb->s_fs_info;
2007 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2008 if (IS_ERR(fsi->bool_dir)) {
2009 ret = PTR_ERR(fsi->bool_dir);
2010 fsi->bool_dir = NULL;
2011 goto err;
2012 }
2013
2014 ret = -ENOMEM;
2015 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2016 if (!dentry)
2017 goto err;
2018
2019 ret = -ENOMEM;
2020 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2021 if (!inode) {
2022 dput(dentry);
2023 goto err;
2024 }
2025
2026 inode->i_ino = ++fsi->last_ino;
2027 isec = selinux_inode(inode);
2028 isec->sid = SECINITSID_DEVNULL;
2029 isec->sclass = SECCLASS_CHR_FILE;
2030 isec->initialized = LABEL_INITIALIZED;
2031
2032 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2033 d_add(dentry, inode);
2034
2035 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2036 if (IS_ERR(dentry)) {
2037 ret = PTR_ERR(dentry);
2038 goto err;
2039 }
2040
2041 ret = sel_make_avc_files(dentry);
2042
2043 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2044 if (IS_ERR(dentry)) {
2045 ret = PTR_ERR(dentry);
2046 goto err;
2047 }
2048
2049 ret = sel_make_ss_files(dentry);
2050 if (ret)
2051 goto err;
2052
2053 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2054 if (IS_ERR(dentry)) {
2055 ret = PTR_ERR(dentry);
2056 goto err;
2057 }
2058
2059 ret = sel_make_initcon_files(dentry);
2060 if (ret)
2061 goto err;
2062
2063 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2064 if (IS_ERR(fsi->class_dir)) {
2065 ret = PTR_ERR(fsi->class_dir);
2066 fsi->class_dir = NULL;
2067 goto err;
2068 }
2069
2070 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2071 &fsi->last_ino);
2072 if (IS_ERR(fsi->policycap_dir)) {
2073 ret = PTR_ERR(fsi->policycap_dir);
2074 fsi->policycap_dir = NULL;
2075 goto err;
2076 }
2077
2078 ret = sel_make_policy_nodes(fsi);
2079 if (ret)
2080 goto err;
2081 return 0;
2082err:
2083 pr_err("SELinux: %s: failed while creating inodes\n",
2084 __func__);
2085
2086 selinux_fs_info_free(sb);
2087
2088 return ret;
2089}
2090
2091static int sel_get_tree(struct fs_context *fc)
2092{
2093 return get_tree_single(fc, sel_fill_super);
2094}
2095
2096static const struct fs_context_operations sel_context_ops = {
2097 .get_tree = sel_get_tree,
2098};
2099
2100static int sel_init_fs_context(struct fs_context *fc)
2101{
2102 fc->ops = &sel_context_ops;
2103 return 0;
2104}
2105
2106static void sel_kill_sb(struct super_block *sb)
2107{
2108 selinux_fs_info_free(sb);
2109 kill_litter_super(sb);
2110}
2111
2112static struct file_system_type sel_fs_type = {
2113 .name = "selinuxfs",
2114 .init_fs_context = sel_init_fs_context,
2115 .kill_sb = sel_kill_sb,
2116};
2117
2118struct vfsmount *selinuxfs_mount;
2119struct path selinux_null;
2120
2121static int __init init_sel_fs(void)
2122{
2123 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2124 sizeof(NULL_FILE_NAME)-1);
2125 int err;
2126
2127 if (!selinux_enabled_boot)
2128 return 0;
2129
2130 err = sysfs_create_mount_point(fs_kobj, "selinux");
2131 if (err)
2132 return err;
2133
2134 err = register_filesystem(&sel_fs_type);
2135 if (err) {
2136 sysfs_remove_mount_point(fs_kobj, "selinux");
2137 return err;
2138 }
2139
2140 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2141 if (IS_ERR(selinuxfs_mount)) {
2142 pr_err("selinuxfs: could not mount!\n");
2143 err = PTR_ERR(selinuxfs_mount);
2144 selinuxfs_mount = NULL;
2145 }
2146 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2147 &null_name);
2148 if (IS_ERR(selinux_null.dentry)) {
2149 pr_err("selinuxfs: could not lookup null!\n");
2150 err = PTR_ERR(selinux_null.dentry);
2151 selinux_null.dentry = NULL;
2152 }
2153
2154 return err;
2155}
2156
2157__initcall(init_sel_fs);
2158
2159#ifdef CONFIG_SECURITY_SELINUX_DISABLE
2160void exit_sel_fs(void)
2161{
2162 sysfs_remove_mount_point(fs_kobj, "selinux");
2163 dput(selinux_null.dentry);
2164 kern_unmount(selinuxfs_mount);
2165 unregister_filesystem(&sel_fs_type);
2166}
2167#endif