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