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Linux 3.1-rc1
[linux-kbuild.git] / security / selinux / selinuxfs.c
blob55d92cbb177acaf31a7b84282cf8d56b0c71fbe5
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 */
45 static char *policycap_names[] = {
46 "network_peer_controls",
47 "open_perms"
48 };
49
50 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
51
52 static 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
61 static DEFINE_MUTEX(sel_mutex);
62
63 /* global data for booleans */
64 static struct dentry *bool_dir;
65 static int bool_num;
66 static char **bool_pending_names;
67 static int *bool_pending_values;
68
69 /* global data for classes */
70 static struct dentry *class_dir;
71 static unsigned long last_class_ino;
72
73 static char policy_opened;
74
75 /* global data for policy capabilities */
76 static struct dentry *policycap_dir;
77
78 extern void selnl_notify_setenforce(int val);
79
80 /* Check whether a task is allowed to use a security operation. */
81 static 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
99 enum 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
122 static 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
131 static 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
142 static 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 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;
188 out:
189 free_page((unsigned long) page);
190 return length;
191 }
192 #else
193 #define sel_write_enforce NULL
194 #endif
195
196 static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 .llseek = generic_file_llseek,
200 };
201
202 static 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 = filp->f_path.dentry->d_inode->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
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
218 };
219
220 static 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
232 static 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
244 static 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
266 static 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
274 static 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 extern int selinux_disable(void);
282
283 length = -ENOMEM;
284 if (count >= PAGE_SIZE)
285 goto out;
286
287 /* No partial writes. */
288 length = -EINVAL;
289 if (*ppos != 0)
290 goto out;
291
292 length = -ENOMEM;
293 page = (char *)get_zeroed_page(GFP_KERNEL);
294 if (!page)
295 goto out;
296
297 length = -EFAULT;
298 if (copy_from_user(page, buf, count))
299 goto out;
300
301 length = -EINVAL;
302 if (sscanf(page, "%d", &new_value) != 1)
303 goto out;
304
305 if (new_value) {
306 length = selinux_disable();
307 if (length)
308 goto out;
309 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
310 "selinux=0 auid=%u ses=%u",
311 audit_get_loginuid(current),
312 audit_get_sessionid(current));
313 }
314
315 length = count;
316 out:
317 free_page((unsigned long) page);
318 return length;
319 }
320 #else
321 #define sel_write_disable NULL
322 #endif
323
324 static const struct file_operations sel_disable_ops = {
325 .write = sel_write_disable,
326 .llseek = generic_file_llseek,
327 };
328
329 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
330 size_t count, loff_t *ppos)
331 {
332 char tmpbuf[TMPBUFLEN];
333 ssize_t length;
334
335 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
336 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
337 }
338
339 static const struct file_operations sel_policyvers_ops = {
340 .read = sel_read_policyvers,
341 .llseek = generic_file_llseek,
342 };
343
344 /* declaration for sel_write_load */
345 static int sel_make_bools(void);
346 static int sel_make_classes(void);
347 static int sel_make_policycap(void);
348
349 /* declaration for sel_make_class_dirs */
350 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
351 unsigned long *ino);
352
353 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
354 size_t count, loff_t *ppos)
355 {
356 char tmpbuf[TMPBUFLEN];
357 ssize_t length;
358
359 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
360 security_mls_enabled());
361 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
362 }
363
364 static const struct file_operations sel_mls_ops = {
365 .read = sel_read_mls,
366 .llseek = generic_file_llseek,
367 };
368
369 struct policy_load_memory {
370 size_t len;
371 void *data;
372 };
373
374 static int sel_open_policy(struct inode *inode, struct file *filp)
375 {
376 struct policy_load_memory *plm = NULL;
377 int rc;
378
379 BUG_ON(filp->private_data);
380
381 mutex_lock(&sel_mutex);
382
383 rc = task_has_security(current, SECURITY__READ_POLICY);
384 if (rc)
385 goto err;
386
387 rc = -EBUSY;
388 if (policy_opened)
389 goto err;
390
391 rc = -ENOMEM;
392 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
393 if (!plm)
394 goto err;
395
396 if (i_size_read(inode) != security_policydb_len()) {
397 mutex_lock(&inode->i_mutex);
398 i_size_write(inode, security_policydb_len());
399 mutex_unlock(&inode->i_mutex);
400 }
401
402 rc = security_read_policy(&plm->data, &plm->len);
403 if (rc)
404 goto err;
405
406 policy_opened = 1;
407
408 filp->private_data = plm;
409
410 mutex_unlock(&sel_mutex);
411
412 return 0;
413 err:
414 mutex_unlock(&sel_mutex);
415
416 if (plm)
417 vfree(plm->data);
418 kfree(plm);
419 return rc;
420 }
421
422 static int sel_release_policy(struct inode *inode, struct file *filp)
423 {
424 struct policy_load_memory *plm = filp->private_data;
425
426 BUG_ON(!plm);
427
428 policy_opened = 0;
429
430 vfree(plm->data);
431 kfree(plm);
432
433 return 0;
434 }
435
436 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
437 size_t count, loff_t *ppos)
438 {
439 struct policy_load_memory *plm = filp->private_data;
440 int ret;
441
442 mutex_lock(&sel_mutex);
443
444 ret = task_has_security(current, SECURITY__READ_POLICY);
445 if (ret)
446 goto out;
447
448 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
449 out:
450 mutex_unlock(&sel_mutex);
451 return ret;
452 }
453
454 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
455 struct vm_fault *vmf)
456 {
457 struct policy_load_memory *plm = vma->vm_file->private_data;
458 unsigned long offset;
459 struct page *page;
460
461 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
462 return VM_FAULT_SIGBUS;
463
464 offset = vmf->pgoff << PAGE_SHIFT;
465 if (offset >= roundup(plm->len, PAGE_SIZE))
466 return VM_FAULT_SIGBUS;
467
468 page = vmalloc_to_page(plm->data + offset);
469 get_page(page);
470
471 vmf->page = page;
472
473 return 0;
474 }
475
476 static struct vm_operations_struct sel_mmap_policy_ops = {
477 .fault = sel_mmap_policy_fault,
478 .page_mkwrite = sel_mmap_policy_fault,
479 };
480
481 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
482 {
483 if (vma->vm_flags & VM_SHARED) {
484 /* do not allow mprotect to make mapping writable */
485 vma->vm_flags &= ~VM_MAYWRITE;
486
487 if (vma->vm_flags & VM_WRITE)
488 return -EACCES;
489 }
490
491 vma->vm_flags |= VM_RESERVED;
492 vma->vm_ops = &sel_mmap_policy_ops;
493
494 return 0;
495 }
496
497 static const struct file_operations sel_policy_ops = {
498 .open = sel_open_policy,
499 .read = sel_read_policy,
500 .mmap = sel_mmap_policy,
501 .release = sel_release_policy,
502 };
503
504 static 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
553 out1:
554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
555 "policy loaded auid=%u ses=%u",
556 audit_get_loginuid(current),
557 audit_get_sessionid(current));
558 out:
559 mutex_unlock(&sel_mutex);
560 vfree(data);
561 return length;
562 }
563
564 static const struct file_operations sel_load_ops = {
565 .write = sel_write_load,
566 .llseek = generic_file_llseek,
567 };
568
569 static 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);
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;
596 out:
597 kfree(canon);
598 return length;
599 }
600
601 static 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
611 static 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;
646 out:
647 free_page((unsigned long) page);
648 return length;
649 }
650 static 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 */
659 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
664
665 static 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
674 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
675 {
676 ino_t ino = file->f_path.dentry->d_inode->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
695 static 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
708 static 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 if (length)
736 goto out;
737
738 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
739 if (length)
740 goto out;
741
742 security_compute_av_user(ssid, tsid, tclass, &avd);
743
744 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
745 "%x %x %x %x %u %x",
746 avd.allowed, 0xffffffff,
747 avd.auditallow, avd.auditdeny,
748 avd.seqno, avd.flags);
749 out:
750 kfree(tcon);
751 kfree(scon);
752 return length;
753 }
754
755 static inline int hexcode_to_int(int code) {
756 if (code == '\0' || !isxdigit(code))
757 return -1;
758 if (isdigit(code))
759 return code - '0';
760 return tolower(code) - 'a' + 10;
761 }
762
763 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
764 {
765 char *scon = NULL, *tcon = NULL;
766 char *namebuf = NULL, *objname = NULL;
767 u32 ssid, tsid, newsid;
768 u16 tclass;
769 ssize_t length;
770 char *newcon = NULL;
771 u32 len;
772 int nargs;
773
774 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
775 if (length)
776 goto out;
777
778 length = -ENOMEM;
779 scon = kzalloc(size + 1, GFP_KERNEL);
780 if (!scon)
781 goto out;
782
783 length = -ENOMEM;
784 tcon = kzalloc(size + 1, GFP_KERNEL);
785 if (!tcon)
786 goto out;
787
788 length = -ENOMEM;
789 namebuf = kzalloc(size + 1, GFP_KERNEL);
790 if (!namebuf)
791 goto out;
792
793 length = -EINVAL;
794 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
795 if (nargs < 3 || nargs > 4)
796 goto out;
797 if (nargs == 4) {
798 /*
799 * If and when the name of new object to be queried contains
800 * either whitespace or multibyte characters, they shall be
801 * encoded based on the percentage-encoding rule.
802 * If not encoded, the sscanf logic picks up only left-half
803 * of the supplied name; splitted by a whitespace unexpectedly.
804 */
805 char *r, *w;
806 int c1, c2;
807
808 r = w = namebuf;
809 do {
810 c1 = *r++;
811 if (c1 == '+')
812 c1 = ' ';
813 else if (c1 == '%') {
814 if ((c1 = hexcode_to_int(*r++)) < 0)
815 goto out;
816 if ((c2 = hexcode_to_int(*r++)) < 0)
817 goto out;
818 c1 = (c1 << 4) | c2;
819 }
820 *w++ = c1;
821 } while (c1 != '\0');
822
823 objname = namebuf;
824 }
825
826 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
827 if (length)
828 goto out;
829
830 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
831 if (length)
832 goto out;
833
834 length = security_transition_sid_user(ssid, tsid, tclass,
835 objname, &newsid);
836 if (length)
837 goto out;
838
839 length = security_sid_to_context(newsid, &newcon, &len);
840 if (length)
841 goto out;
842
843 length = -ERANGE;
844 if (len > SIMPLE_TRANSACTION_LIMIT) {
845 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
846 "payload max\n", __func__, len);
847 goto out;
848 }
849
850 memcpy(buf, newcon, len);
851 length = len;
852 out:
853 kfree(newcon);
854 kfree(namebuf);
855 kfree(tcon);
856 kfree(scon);
857 return length;
858 }
859
860 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
861 {
862 char *scon = NULL, *tcon = NULL;
863 u32 ssid, tsid, newsid;
864 u16 tclass;
865 ssize_t length;
866 char *newcon = NULL;
867 u32 len;
868
869 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
870 if (length)
871 goto out;
872
873 length = -ENOMEM;
874 scon = kzalloc(size + 1, GFP_KERNEL);
875 if (!scon)
876 goto out;
877
878 length = -ENOMEM;
879 tcon = kzalloc(size + 1, GFP_KERNEL);
880 if (!tcon)
881 goto out;
882
883 length = -EINVAL;
884 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
885 goto out;
886
887 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
888 if (length)
889 goto out;
890
891 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
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;
909 out:
910 kfree(newcon);
911 kfree(tcon);
912 kfree(scon);
913 return length;
914 }
915
916 static 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);
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 }
969 out:
970 kfree(sids);
971 kfree(user);
972 kfree(con);
973 return length;
974 }
975
976 static 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 if (length)
1005 goto out;
1006
1007 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
1008 if (length)
1009 goto out;
1010
1011 length = security_member_sid(ssid, tsid, tclass, &newsid);
1012 if (length)
1013 goto out;
1014
1015 length = security_sid_to_context(newsid, &newcon, &len);
1016 if (length)
1017 goto out;
1018
1019 length = -ERANGE;
1020 if (len > SIMPLE_TRANSACTION_LIMIT) {
1021 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1022 "payload max\n", __func__, len);
1023 goto out;
1024 }
1025
1026 memcpy(buf, newcon, len);
1027 length = len;
1028 out:
1029 kfree(newcon);
1030 kfree(tcon);
1031 kfree(scon);
1032 return length;
1033 }
1034
1035 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1036 {
1037 struct inode *ret = new_inode(sb);
1038
1039 if (ret) {
1040 ret->i_mode = mode;
1041 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1042 }
1043 return ret;
1044 }
1045
1046 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1047 size_t count, loff_t *ppos)
1048 {
1049 char *page = NULL;
1050 ssize_t length;
1051 ssize_t ret;
1052 int cur_enforcing;
1053 struct inode *inode = filep->f_path.dentry->d_inode;
1054 unsigned index = inode->i_ino & SEL_INO_MASK;
1055 const char *name = filep->f_path.dentry->d_name.name;
1056
1057 mutex_lock(&sel_mutex);
1058
1059 ret = -EINVAL;
1060 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1061 goto out;
1062
1063 ret = -ENOMEM;
1064 page = (char *)get_zeroed_page(GFP_KERNEL);
1065 if (!page)
1066 goto out;
1067
1068 cur_enforcing = security_get_bool_value(index);
1069 if (cur_enforcing < 0) {
1070 ret = cur_enforcing;
1071 goto out;
1072 }
1073 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1074 bool_pending_values[index]);
1075 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1076 out:
1077 mutex_unlock(&sel_mutex);
1078 free_page((unsigned long)page);
1079 return ret;
1080 }
1081
1082 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1083 size_t count, loff_t *ppos)
1084 {
1085 char *page = NULL;
1086 ssize_t length;
1087 int new_value;
1088 struct inode *inode = filep->f_path.dentry->d_inode;
1089 unsigned index = inode->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
1130 out:
1131 mutex_unlock(&sel_mutex);
1132 free_page((unsigned long) page);
1133 return length;
1134 }
1135
1136 static const struct file_operations sel_bool_ops = {
1137 .read = sel_read_bool,
1138 .write = sel_write_bool,
1139 .llseek = generic_file_llseek,
1140 };
1141
1142 static 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
1185 out:
1186 mutex_unlock(&sel_mutex);
1187 free_page((unsigned long) page);
1188 return length;
1189 }
1190
1191 static const struct file_operations sel_commit_bools_ops = {
1192 .write = sel_commit_bools_write,
1193 .llseek = generic_file_llseek,
1194 };
1195
1196 static 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
1226 static 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_pending_names = NULL;
1245 bool_pending_values = NULL;
1246
1247 sel_remove_entries(dir);
1248
1249 ret = -ENOMEM;
1250 page = (char *)get_zeroed_page(GFP_KERNEL);
1251 if (!page)
1252 goto out;
1253
1254 ret = security_get_bools(&num, &names, &values);
1255 if (ret)
1256 goto out;
1257
1258 for (i = 0; i < num; i++) {
1259 ret = -ENOMEM;
1260 dentry = d_alloc_name(dir, names[i]);
1261 if (!dentry)
1262 goto out;
1263
1264 ret = -ENOMEM;
1265 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1266 if (!inode)
1267 goto out;
1268
1269 ret = -EINVAL;
1270 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1271 if (len < 0)
1272 goto out;
1273
1274 ret = -ENAMETOOLONG;
1275 if (len >= PAGE_SIZE)
1276 goto out;
1277
1278 isec = (struct inode_security_struct *)inode->i_security;
1279 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1280 if (ret)
1281 goto out;
1282
1283 isec->sid = sid;
1284 isec->initialized = 1;
1285 inode->i_fop = &sel_bool_ops;
1286 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1287 d_add(dentry, inode);
1288 }
1289 bool_num = num;
1290 bool_pending_names = names;
1291 bool_pending_values = values;
1292
1293 free_page((unsigned long)page);
1294 return 0;
1295 out:
1296 free_page((unsigned long)page);
1297
1298 if (names) {
1299 for (i = 0; i < num; i++)
1300 kfree(names[i]);
1301 kfree(names);
1302 }
1303 kfree(values);
1304 sel_remove_entries(dir);
1305
1306 return ret;
1307 }
1308
1309 #define NULL_FILE_NAME "null"
1310
1311 struct dentry *selinux_null;
1312
1313 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1314 size_t count, loff_t *ppos)
1315 {
1316 char tmpbuf[TMPBUFLEN];
1317 ssize_t length;
1318
1319 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1320 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1321 }
1322
1323 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1324 const char __user *buf,
1325 size_t count, loff_t *ppos)
1326
1327 {
1328 char *page = NULL;
1329 ssize_t ret;
1330 int new_value;
1331
1332 ret = task_has_security(current, SECURITY__SETSECPARAM);
1333 if (ret)
1334 goto out;
1335
1336 ret = -ENOMEM;
1337 if (count >= PAGE_SIZE)
1338 goto out;
1339
1340 /* No partial writes. */
1341 ret = -EINVAL;
1342 if (*ppos != 0)
1343 goto out;
1344
1345 ret = -ENOMEM;
1346 page = (char *)get_zeroed_page(GFP_KERNEL);
1347 if (!page)
1348 goto out;
1349
1350 ret = -EFAULT;
1351 if (copy_from_user(page, buf, count))
1352 goto out;
1353
1354 ret = -EINVAL;
1355 if (sscanf(page, "%u", &new_value) != 1)
1356 goto out;
1357
1358 avc_cache_threshold = new_value;
1359
1360 ret = count;
1361 out:
1362 free_page((unsigned long)page);
1363 return ret;
1364 }
1365
1366 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1367 size_t count, loff_t *ppos)
1368 {
1369 char *page;
1370 ssize_t length;
1371
1372 page = (char *)__get_free_page(GFP_KERNEL);
1373 if (!page)
1374 return -ENOMEM;
1375
1376 length = avc_get_hash_stats(page);
1377 if (length >= 0)
1378 length = simple_read_from_buffer(buf, count, ppos, page, length);
1379 free_page((unsigned long)page);
1380
1381 return length;
1382 }
1383
1384 static const struct file_operations sel_avc_cache_threshold_ops = {
1385 .read = sel_read_avc_cache_threshold,
1386 .write = sel_write_avc_cache_threshold,
1387 .llseek = generic_file_llseek,
1388 };
1389
1390 static const struct file_operations sel_avc_hash_stats_ops = {
1391 .read = sel_read_avc_hash_stats,
1392 .llseek = generic_file_llseek,
1393 };
1394
1395 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1396 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1397 {
1398 int cpu;
1399
1400 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1401 if (!cpu_possible(cpu))
1402 continue;
1403 *idx = cpu + 1;
1404 return &per_cpu(avc_cache_stats, cpu);
1405 }
1406 return NULL;
1407 }
1408
1409 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1410 {
1411 loff_t n = *pos - 1;
1412
1413 if (*pos == 0)
1414 return SEQ_START_TOKEN;
1415
1416 return sel_avc_get_stat_idx(&n);
1417 }
1418
1419 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1420 {
1421 return sel_avc_get_stat_idx(pos);
1422 }
1423
1424 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1425 {
1426 struct avc_cache_stats *st = v;
1427
1428 if (v == SEQ_START_TOKEN)
1429 seq_printf(seq, "lookups hits misses allocations reclaims "
1430 "frees\n");
1431 else {
1432 unsigned int lookups = st->lookups;
1433 unsigned int misses = st->misses;
1434 unsigned int hits = lookups - misses;
1435 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1436 hits, misses, st->allocations,
1437 st->reclaims, st->frees);
1438 }
1439 return 0;
1440 }
1441
1442 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1443 { }
1444
1445 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1446 .start = sel_avc_stats_seq_start,
1447 .next = sel_avc_stats_seq_next,
1448 .show = sel_avc_stats_seq_show,
1449 .stop = sel_avc_stats_seq_stop,
1450 };
1451
1452 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1453 {
1454 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1455 }
1456
1457 static const struct file_operations sel_avc_cache_stats_ops = {
1458 .open = sel_open_avc_cache_stats,
1459 .read = seq_read,
1460 .llseek = seq_lseek,
1461 .release = seq_release,
1462 };
1463 #endif
1464
1465 static int sel_make_avc_files(struct dentry *dir)
1466 {
1467 int i;
1468 static struct tree_descr files[] = {
1469 { "cache_threshold",
1470 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1471 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1472 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1473 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1474 #endif
1475 };
1476
1477 for (i = 0; i < ARRAY_SIZE(files); i++) {
1478 struct inode *inode;
1479 struct dentry *dentry;
1480
1481 dentry = d_alloc_name(dir, files[i].name);
1482 if (!dentry)
1483 return -ENOMEM;
1484
1485 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1486 if (!inode)
1487 return -ENOMEM;
1488
1489 inode->i_fop = files[i].ops;
1490 inode->i_ino = ++sel_last_ino;
1491 d_add(dentry, inode);
1492 }
1493
1494 return 0;
1495 }
1496
1497 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1498 size_t count, loff_t *ppos)
1499 {
1500 struct inode *inode;
1501 char *con;
1502 u32 sid, len;
1503 ssize_t ret;
1504
1505 inode = file->f_path.dentry->d_inode;
1506 sid = inode->i_ino&SEL_INO_MASK;
1507 ret = security_sid_to_context(sid, &con, &len);
1508 if (ret)
1509 return ret;
1510
1511 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1512 kfree(con);
1513 return ret;
1514 }
1515
1516 static const struct file_operations sel_initcon_ops = {
1517 .read = sel_read_initcon,
1518 .llseek = generic_file_llseek,
1519 };
1520
1521 static int sel_make_initcon_files(struct dentry *dir)
1522 {
1523 int i;
1524
1525 for (i = 1; i <= SECINITSID_NUM; i++) {
1526 struct inode *inode;
1527 struct dentry *dentry;
1528 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1529 if (!dentry)
1530 return -ENOMEM;
1531
1532 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1533 if (!inode)
1534 return -ENOMEM;
1535
1536 inode->i_fop = &sel_initcon_ops;
1537 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1538 d_add(dentry, inode);
1539 }
1540
1541 return 0;
1542 }
1543
1544 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1545 {
1546 return a / b - (a % b < 0);
1547 }
1548
1549 static inline unsigned long sel_class_to_ino(u16 class)
1550 {
1551 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1552 }
1553
1554 static inline u16 sel_ino_to_class(unsigned long ino)
1555 {
1556 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1557 }
1558
1559 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1560 {
1561 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1562 }
1563
1564 static inline u32 sel_ino_to_perm(unsigned long ino)
1565 {
1566 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1567 }
1568
1569 static ssize_t sel_read_class(struct file *file, char __user *buf,
1570 size_t count, loff_t *ppos)
1571 {
1572 ssize_t rc, len;
1573 char *page;
1574 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1575
1576 page = (char *)__get_free_page(GFP_KERNEL);
1577 if (!page)
1578 return -ENOMEM;
1579
1580 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1581 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1582 free_page((unsigned long)page);
1583
1584 return rc;
1585 }
1586
1587 static const struct file_operations sel_class_ops = {
1588 .read = sel_read_class,
1589 .llseek = generic_file_llseek,
1590 };
1591
1592 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1593 size_t count, loff_t *ppos)
1594 {
1595 ssize_t rc, len;
1596 char *page;
1597 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1598
1599 page = (char *)__get_free_page(GFP_KERNEL);
1600 if (!page)
1601 return -ENOMEM;
1602
1603 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1604 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1605 free_page((unsigned long)page);
1606
1607 return rc;
1608 }
1609
1610 static const struct file_operations sel_perm_ops = {
1611 .read = sel_read_perm,
1612 .llseek = generic_file_llseek,
1613 };
1614
1615 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1616 size_t count, loff_t *ppos)
1617 {
1618 int value;
1619 char tmpbuf[TMPBUFLEN];
1620 ssize_t length;
1621 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1622
1623 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1624 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1625
1626 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1627 }
1628
1629 static const struct file_operations sel_policycap_ops = {
1630 .read = sel_read_policycap,
1631 .llseek = generic_file_llseek,
1632 };
1633
1634 static int sel_make_perm_files(char *objclass, int classvalue,
1635 struct dentry *dir)
1636 {
1637 int i, rc, nperms;
1638 char **perms;
1639
1640 rc = security_get_permissions(objclass, &perms, &nperms);
1641 if (rc)
1642 return rc;
1643
1644 for (i = 0; i < nperms; i++) {
1645 struct inode *inode;
1646 struct dentry *dentry;
1647
1648 rc = -ENOMEM;
1649 dentry = d_alloc_name(dir, perms[i]);
1650 if (!dentry)
1651 goto out;
1652
1653 rc = -ENOMEM;
1654 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1655 if (!inode)
1656 goto out;
1657
1658 inode->i_fop = &sel_perm_ops;
1659 /* i+1 since perm values are 1-indexed */
1660 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1661 d_add(dentry, inode);
1662 }
1663 rc = 0;
1664 out:
1665 for (i = 0; i < nperms; i++)
1666 kfree(perms[i]);
1667 kfree(perms);
1668 return rc;
1669 }
1670
1671 static int sel_make_class_dir_entries(char *classname, int index,
1672 struct dentry *dir)
1673 {
1674 struct dentry *dentry = NULL;
1675 struct inode *inode = NULL;
1676 int rc;
1677
1678 dentry = d_alloc_name(dir, "index");
1679 if (!dentry)
1680 return -ENOMEM;
1681
1682 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1683 if (!inode)
1684 return -ENOMEM;
1685
1686 inode->i_fop = &sel_class_ops;
1687 inode->i_ino = sel_class_to_ino(index);
1688 d_add(dentry, inode);
1689
1690 dentry = d_alloc_name(dir, "perms");
1691 if (!dentry)
1692 return -ENOMEM;
1693
1694 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1695 if (rc)
1696 return rc;
1697
1698 rc = sel_make_perm_files(classname, index, dentry);
1699
1700 return rc;
1701 }
1702
1703 static void sel_remove_classes(void)
1704 {
1705 struct list_head *class_node;
1706
1707 list_for_each(class_node, &class_dir->d_subdirs) {
1708 struct dentry *class_subdir = list_entry(class_node,
1709 struct dentry, d_u.d_child);
1710 struct list_head *class_subdir_node;
1711
1712 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1713 struct dentry *d = list_entry(class_subdir_node,
1714 struct dentry, d_u.d_child);
1715
1716 if (d->d_inode)
1717 if (d->d_inode->i_mode & S_IFDIR)
1718 sel_remove_entries(d);
1719 }
1720
1721 sel_remove_entries(class_subdir);
1722 }
1723
1724 sel_remove_entries(class_dir);
1725 }
1726
1727 static int sel_make_classes(void)
1728 {
1729 int rc, nclasses, i;
1730 char **classes;
1731
1732 /* delete any existing entries */
1733 sel_remove_classes();
1734
1735 rc = security_get_classes(&classes, &nclasses);
1736 if (rc)
1737 return rc;
1738
1739 /* +2 since classes are 1-indexed */
1740 last_class_ino = sel_class_to_ino(nclasses + 2);
1741
1742 for (i = 0; i < nclasses; i++) {
1743 struct dentry *class_name_dir;
1744
1745 rc = -ENOMEM;
1746 class_name_dir = d_alloc_name(class_dir, classes[i]);
1747 if (!class_name_dir)
1748 goto out;
1749
1750 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1751 &last_class_ino);
1752 if (rc)
1753 goto out;
1754
1755 /* i+1 since class values are 1-indexed */
1756 rc = sel_make_class_dir_entries(classes[i], i + 1,
1757 class_name_dir);
1758 if (rc)
1759 goto out;
1760 }
1761 rc = 0;
1762 out:
1763 for (i = 0; i < nclasses; i++)
1764 kfree(classes[i]);
1765 kfree(classes);
1766 return rc;
1767 }
1768
1769 static int sel_make_policycap(void)
1770 {
1771 unsigned int iter;
1772 struct dentry *dentry = NULL;
1773 struct inode *inode = NULL;
1774
1775 sel_remove_entries(policycap_dir);
1776
1777 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1778 if (iter < ARRAY_SIZE(policycap_names))
1779 dentry = d_alloc_name(policycap_dir,
1780 policycap_names[iter]);
1781 else
1782 dentry = d_alloc_name(policycap_dir, "unknown");
1783
1784 if (dentry == NULL)
1785 return -ENOMEM;
1786
1787 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1788 if (inode == NULL)
1789 return -ENOMEM;
1790
1791 inode->i_fop = &sel_policycap_ops;
1792 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1793 d_add(dentry, inode);
1794 }
1795
1796 return 0;
1797 }
1798
1799 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1800 unsigned long *ino)
1801 {
1802 struct inode *inode;
1803
1804 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1805 if (!inode)
1806 return -ENOMEM;
1807
1808 inode->i_op = &simple_dir_inode_operations;
1809 inode->i_fop = &simple_dir_operations;
1810 inode->i_ino = ++(*ino);
1811 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1812 inc_nlink(inode);
1813 d_add(dentry, inode);
1814 /* bump link count on parent directory, too */
1815 inc_nlink(dir);
1816
1817 return 0;
1818 }
1819
1820 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1821 {
1822 int ret;
1823 struct dentry *dentry;
1824 struct inode *inode, *root_inode;
1825 struct inode_security_struct *isec;
1826
1827 static struct tree_descr selinux_files[] = {
1828 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1829 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1830 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1831 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1832 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1833 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1834 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1835 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1836 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1837 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1838 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1839 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1840 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1841 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1842 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1843 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1844 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1845 /* last one */ {""}
1846 };
1847 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1848 if (ret)
1849 goto err;
1850
1851 root_inode = sb->s_root->d_inode;
1852
1853 ret = -ENOMEM;
1854 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1855 if (!dentry)
1856 goto err;
1857
1858 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1859 if (ret)
1860 goto err;
1861
1862 bool_dir = dentry;
1863
1864 ret = -ENOMEM;
1865 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1866 if (!dentry)
1867 goto err;
1868
1869 ret = -ENOMEM;
1870 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1871 if (!inode)
1872 goto err;
1873
1874 inode->i_ino = ++sel_last_ino;
1875 isec = (struct inode_security_struct *)inode->i_security;
1876 isec->sid = SECINITSID_DEVNULL;
1877 isec->sclass = SECCLASS_CHR_FILE;
1878 isec->initialized = 1;
1879
1880 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1881 d_add(dentry, inode);
1882 selinux_null = dentry;
1883
1884 ret = -ENOMEM;
1885 dentry = d_alloc_name(sb->s_root, "avc");
1886 if (!dentry)
1887 goto err;
1888
1889 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1890 if (ret)
1891 goto err;
1892
1893 ret = sel_make_avc_files(dentry);
1894 if (ret)
1895 goto err;
1896
1897 ret = -ENOMEM;
1898 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1899 if (!dentry)
1900 goto err;
1901
1902 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1903 if (ret)
1904 goto err;
1905
1906 ret = sel_make_initcon_files(dentry);
1907 if (ret)
1908 goto err;
1909
1910 ret = -ENOMEM;
1911 dentry = d_alloc_name(sb->s_root, "class");
1912 if (!dentry)
1913 goto err;
1914
1915 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1916 if (ret)
1917 goto err;
1918
1919 class_dir = dentry;
1920
1921 ret = -ENOMEM;
1922 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1923 if (!dentry)
1924 goto err;
1925
1926 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1927 if (ret)
1928 goto err;
1929
1930 policycap_dir = dentry;
1931
1932 return 0;
1933 err:
1934 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1935 __func__);
1936 return ret;
1937 }
1938
1939 static struct dentry *sel_mount(struct file_system_type *fs_type,
1940 int flags, const char *dev_name, void *data)
1941 {
1942 return mount_single(fs_type, flags, data, sel_fill_super);
1943 }
1944
1945 static struct file_system_type sel_fs_type = {
1946 .name = "selinuxfs",
1947 .mount = sel_mount,
1948 .kill_sb = kill_litter_super,
1949 };
1950
1951 struct vfsmount *selinuxfs_mount;
1952 static struct kobject *selinuxfs_kobj;
1953
1954 static int __init init_sel_fs(void)
1955 {
1956 int err;
1957
1958 if (!selinux_enabled)
1959 return 0;
1960
1961 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1962 if (!selinuxfs_kobj)
1963 return -ENOMEM;
1964
1965 err = register_filesystem(&sel_fs_type);
1966 if (err) {
1967 kobject_put(selinuxfs_kobj);
1968 return err;
1969 }
1970
1971 selinuxfs_mount = kern_mount(&sel_fs_type);
1972 if (IS_ERR(selinuxfs_mount)) {
1973 printk(KERN_ERR "selinuxfs: could not mount!\n");
1974 err = PTR_ERR(selinuxfs_mount);
1975 selinuxfs_mount = NULL;
1976 }
1977
1978 return err;
1979 }
1980
1981 __initcall(init_sel_fs);
1982
1983 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1984 void exit_sel_fs(void)
1985 {
1986 kobject_put(selinuxfs_kobj);
1987 kern_unmount(selinuxfs_mount);
1988 unregister_filesystem(&sel_fs_type);
1989 }
1990 #endif
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