Loading...
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
1// SPDX-License-Identifier: GPL-2.0-only
2/* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 *
4 * Added conditional policy language extensions
5 *
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 *
8 * Added support for the policy capability bitmap
9 *
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/pagemap.h>
17#include <linux/slab.h>
18#include <linux/vmalloc.h>
19#include <linux/fs.h>
20#include <linux/fs_context.h>
21#include <linux/mount.h>
22#include <linux/mutex.h>
23#include <linux/namei.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/security.h>
27#include <linux/major.h>
28#include <linux/seq_file.h>
29#include <linux/percpu.h>
30#include <linux/audit.h>
31#include <linux/uaccess.h>
32#include <linux/kobject.h>
33#include <linux/ctype.h>
34
35/* selinuxfs pseudo filesystem for exporting the security policy API.
36 Based on the proc code and the fs/nfsd/nfsctl.c code. */
37
38#include "flask.h"
39#include "avc.h"
40#include "avc_ss.h"
41#include "security.h"
42#include "objsec.h"
43#include "conditional.h"
44#include "ima.h"
45
46enum sel_inos {
47 SEL_ROOT_INO = 2,
48 SEL_LOAD, /* load policy */
49 SEL_ENFORCE, /* get or set enforcing status */
50 SEL_CONTEXT, /* validate context */
51 SEL_ACCESS, /* compute access decision */
52 SEL_CREATE, /* compute create labeling decision */
53 SEL_RELABEL, /* compute relabeling decision */
54 SEL_USER, /* compute reachable user contexts */
55 SEL_POLICYVERS, /* return policy version for this kernel */
56 SEL_COMMIT_BOOLS, /* commit new boolean values */
57 SEL_MLS, /* return if MLS policy is enabled */
58 SEL_DISABLE, /* disable SELinux until next reboot */
59 SEL_MEMBER, /* compute polyinstantiation membership decision */
60 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
61 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
62 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
63 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
64 SEL_STATUS, /* export current status using mmap() */
65 SEL_POLICY, /* allow userspace to read the in kernel policy */
66 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
67 SEL_INO_NEXT, /* The next inode number to use */
68};
69
70struct selinux_fs_info {
71 struct dentry *bool_dir;
72 unsigned int bool_num;
73 char **bool_pending_names;
74 int *bool_pending_values;
75 struct dentry *class_dir;
76 unsigned long last_class_ino;
77 bool policy_opened;
78 struct dentry *policycap_dir;
79 unsigned long last_ino;
80 struct super_block *sb;
81};
82
83static int selinux_fs_info_create(struct super_block *sb)
84{
85 struct selinux_fs_info *fsi;
86
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
88 if (!fsi)
89 return -ENOMEM;
90
91 fsi->last_ino = SEL_INO_NEXT - 1;
92 fsi->sb = sb;
93 sb->s_fs_info = fsi;
94 return 0;
95}
96
97static void selinux_fs_info_free(struct super_block *sb)
98{
99 struct selinux_fs_info *fsi = sb->s_fs_info;
100 unsigned int i;
101
102 if (fsi) {
103 for (i = 0; i < fsi->bool_num; i++)
104 kfree(fsi->bool_pending_names[i]);
105 kfree(fsi->bool_pending_names);
106 kfree(fsi->bool_pending_values);
107 }
108 kfree(sb->s_fs_info);
109 sb->s_fs_info = NULL;
110}
111
112#define SEL_INITCON_INO_OFFSET 0x01000000
113#define SEL_BOOL_INO_OFFSET 0x02000000
114#define SEL_CLASS_INO_OFFSET 0x04000000
115#define SEL_POLICYCAP_INO_OFFSET 0x08000000
116#define SEL_INO_MASK 0x00ffffff
117
118#define BOOL_DIR_NAME "booleans"
119#define CLASS_DIR_NAME "class"
120#define POLICYCAP_DIR_NAME "policy_capabilities"
121
122#define TMPBUFLEN 12
123static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
124 size_t count, loff_t *ppos)
125{
126 char tmpbuf[TMPBUFLEN];
127 ssize_t length;
128
129 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
130 enforcing_enabled());
131 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
132}
133
134#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
135static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
136 size_t count, loff_t *ppos)
137
138{
139 char *page = NULL;
140 ssize_t length;
141 int scan_value;
142 bool old_value, new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146
147 /* No partial writes. */
148 if (*ppos != 0)
149 return -EINVAL;
150
151 page = memdup_user_nul(buf, count);
152 if (IS_ERR(page))
153 return PTR_ERR(page);
154
155 length = -EINVAL;
156 if (sscanf(page, "%d", &scan_value) != 1)
157 goto out;
158
159 new_value = !!scan_value;
160
161 old_value = enforcing_enabled();
162 if (new_value != old_value) {
163 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
164 SECCLASS_SECURITY, SECURITY__SETENFORCE,
165 NULL);
166 if (length)
167 goto out;
168 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
169 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
170 " enabled=1 old-enabled=1 lsm=selinux res=1",
171 new_value, old_value,
172 from_kuid(&init_user_ns, audit_get_loginuid(current)),
173 audit_get_sessionid(current));
174 enforcing_set(new_value);
175 if (new_value)
176 avc_ss_reset(0);
177 selnl_notify_setenforce(new_value);
178 selinux_status_update_setenforce(new_value);
179 if (!new_value)
180 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
181
182 selinux_ima_measure_state();
183 }
184 length = count;
185out:
186 kfree(page);
187 return length;
188}
189#else
190#define sel_write_enforce NULL
191#endif
192
193static const struct file_operations sel_enforce_ops = {
194 .read = sel_read_enforce,
195 .write = sel_write_enforce,
196 .llseek = generic_file_llseek,
197};
198
199static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
200 size_t count, loff_t *ppos)
201{
202 char tmpbuf[TMPBUFLEN];
203 ssize_t length;
204 ino_t ino = file_inode(filp)->i_ino;
205 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
206 security_get_reject_unknown() :
207 !security_get_allow_unknown();
208
209 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211}
212
213static const struct file_operations sel_handle_unknown_ops = {
214 .read = sel_read_handle_unknown,
215 .llseek = generic_file_llseek,
216};
217
218static int sel_open_handle_status(struct inode *inode, struct file *filp)
219{
220 struct page *status = selinux_kernel_status_page();
221
222 if (!status)
223 return -ENOMEM;
224
225 filp->private_data = status;
226
227 return 0;
228}
229
230static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231 size_t count, loff_t *ppos)
232{
233 struct page *status = filp->private_data;
234
235 BUG_ON(!status);
236
237 return simple_read_from_buffer(buf, count, ppos,
238 page_address(status),
239 sizeof(struct selinux_kernel_status));
240}
241
242static int sel_mmap_handle_status(struct file *filp,
243 struct vm_area_struct *vma)
244{
245 struct page *status = filp->private_data;
246 unsigned long size = vma->vm_end - vma->vm_start;
247
248 BUG_ON(!status);
249
250 /* only allows one page from the head */
251 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
252 return -EIO;
253 /* disallow writable mapping */
254 if (vma->vm_flags & VM_WRITE)
255 return -EPERM;
256 /* disallow mprotect() turns it into writable */
257 vm_flags_clear(vma, VM_MAYWRITE);
258
259 return remap_pfn_range(vma, vma->vm_start,
260 page_to_pfn(status),
261 size, vma->vm_page_prot);
262}
263
264static const struct file_operations sel_handle_status_ops = {
265 .open = sel_open_handle_status,
266 .read = sel_read_handle_status,
267 .mmap = sel_mmap_handle_status,
268 .llseek = generic_file_llseek,
269};
270
271static ssize_t sel_write_disable(struct file *file, const char __user *buf,
272 size_t count, loff_t *ppos)
273
274{
275 char *page;
276 ssize_t length;
277 int new_value;
278
279 if (count >= PAGE_SIZE)
280 return -ENOMEM;
281
282 /* No partial writes. */
283 if (*ppos != 0)
284 return -EINVAL;
285
286 page = memdup_user_nul(buf, count);
287 if (IS_ERR(page))
288 return PTR_ERR(page);
289
290 if (sscanf(page, "%d", &new_value) != 1) {
291 length = -EINVAL;
292 goto out;
293 }
294 length = count;
295
296 if (new_value) {
297 pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
298 pr_err("SELinux: Runtime disable is not supported, use selinux=0 on the kernel cmdline.\n");
299 }
300
301out:
302 kfree(page);
303 return length;
304}
305
306static const struct file_operations sel_disable_ops = {
307 .write = sel_write_disable,
308 .llseek = generic_file_llseek,
309};
310
311static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
312 size_t count, loff_t *ppos)
313{
314 char tmpbuf[TMPBUFLEN];
315 ssize_t length;
316
317 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
318 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
319}
320
321static const struct file_operations sel_policyvers_ops = {
322 .read = sel_read_policyvers,
323 .llseek = generic_file_llseek,
324};
325
326/* declaration for sel_write_load */
327static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
328 unsigned int *bool_num, char ***bool_pending_names,
329 int **bool_pending_values);
330static int sel_make_classes(struct selinux_policy *newpolicy,
331 struct dentry *class_dir,
332 unsigned long *last_class_ino);
333
334/* declaration for sel_make_class_dirs */
335static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
336 unsigned long *ino);
337
338/* declaration for sel_make_policy_nodes */
339static struct dentry *sel_make_swapover_dir(struct super_block *sb,
340 unsigned long *ino);
341
342static ssize_t sel_read_mls(struct file *filp, char __user *buf,
343 size_t count, loff_t *ppos)
344{
345 char tmpbuf[TMPBUFLEN];
346 ssize_t length;
347
348 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
349 security_mls_enabled());
350 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
351}
352
353static const struct file_operations sel_mls_ops = {
354 .read = sel_read_mls,
355 .llseek = generic_file_llseek,
356};
357
358struct policy_load_memory {
359 size_t len;
360 void *data;
361};
362
363static int sel_open_policy(struct inode *inode, struct file *filp)
364{
365 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
366 struct policy_load_memory *plm = NULL;
367 int rc;
368
369 BUG_ON(filp->private_data);
370
371 mutex_lock(&selinux_state.policy_mutex);
372
373 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
374 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
375 if (rc)
376 goto err;
377
378 rc = -EBUSY;
379 if (fsi->policy_opened)
380 goto err;
381
382 rc = -ENOMEM;
383 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
384 if (!plm)
385 goto err;
386
387 rc = security_read_policy(&plm->data, &plm->len);
388 if (rc)
389 goto err;
390
391 if ((size_t)i_size_read(inode) != plm->len) {
392 inode_lock(inode);
393 i_size_write(inode, plm->len);
394 inode_unlock(inode);
395 }
396
397 fsi->policy_opened = 1;
398
399 filp->private_data = plm;
400
401 mutex_unlock(&selinux_state.policy_mutex);
402
403 return 0;
404err:
405 mutex_unlock(&selinux_state.policy_mutex);
406
407 if (plm)
408 vfree(plm->data);
409 kfree(plm);
410 return rc;
411}
412
413static int sel_release_policy(struct inode *inode, struct file *filp)
414{
415 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
416 struct policy_load_memory *plm = filp->private_data;
417
418 BUG_ON(!plm);
419
420 fsi->policy_opened = 0;
421
422 vfree(plm->data);
423 kfree(plm);
424
425 return 0;
426}
427
428static ssize_t sel_read_policy(struct file *filp, char __user *buf,
429 size_t count, loff_t *ppos)
430{
431 struct policy_load_memory *plm = filp->private_data;
432 int ret;
433
434 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
435 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
436 if (ret)
437 return ret;
438
439 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
440}
441
442static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
443{
444 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
445 unsigned long offset;
446 struct page *page;
447
448 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
449 return VM_FAULT_SIGBUS;
450
451 offset = vmf->pgoff << PAGE_SHIFT;
452 if (offset >= roundup(plm->len, PAGE_SIZE))
453 return VM_FAULT_SIGBUS;
454
455 page = vmalloc_to_page(plm->data + offset);
456 get_page(page);
457
458 vmf->page = page;
459
460 return 0;
461}
462
463static const struct vm_operations_struct sel_mmap_policy_ops = {
464 .fault = sel_mmap_policy_fault,
465 .page_mkwrite = sel_mmap_policy_fault,
466};
467
468static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
469{
470 if (vma->vm_flags & VM_SHARED) {
471 /* do not allow mprotect to make mapping writable */
472 vm_flags_clear(vma, VM_MAYWRITE);
473
474 if (vma->vm_flags & VM_WRITE)
475 return -EACCES;
476 }
477
478 vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP);
479 vma->vm_ops = &sel_mmap_policy_ops;
480
481 return 0;
482}
483
484static const struct file_operations sel_policy_ops = {
485 .open = sel_open_policy,
486 .read = sel_read_policy,
487 .mmap = sel_mmap_policy,
488 .release = sel_release_policy,
489 .llseek = generic_file_llseek,
490};
491
492static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
493 int *bool_values)
494{
495 u32 i;
496
497 /* bool_dir cleanup */
498 for (i = 0; i < bool_num; i++)
499 kfree(bool_names[i]);
500 kfree(bool_names);
501 kfree(bool_values);
502}
503
504static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
505 struct selinux_policy *newpolicy)
506{
507 int ret = 0;
508 struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir;
509 unsigned int bool_num = 0;
510 char **bool_names = NULL;
511 int *bool_values = NULL;
512 unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
513
514 tmp_parent = sel_make_swapover_dir(fsi->sb, &tmp_ino);
515 if (IS_ERR(tmp_parent))
516 return PTR_ERR(tmp_parent);
517
518 tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
519 tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
520 if (IS_ERR(tmp_bool_dir)) {
521 ret = PTR_ERR(tmp_bool_dir);
522 goto out;
523 }
524
525 tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
526 tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
527 if (IS_ERR(tmp_class_dir)) {
528 ret = PTR_ERR(tmp_class_dir);
529 goto out;
530 }
531
532 ret = sel_make_bools(newpolicy, tmp_bool_dir, &bool_num,
533 &bool_names, &bool_values);
534 if (ret)
535 goto out;
536
537 ret = sel_make_classes(newpolicy, tmp_class_dir,
538 &fsi->last_class_ino);
539 if (ret)
540 goto out;
541
542 lock_rename(tmp_parent, fsi->sb->s_root);
543
544 /* booleans */
545 d_exchange(tmp_bool_dir, fsi->bool_dir);
546
547 swap(fsi->bool_num, bool_num);
548 swap(fsi->bool_pending_names, bool_names);
549 swap(fsi->bool_pending_values, bool_values);
550
551 fsi->bool_dir = tmp_bool_dir;
552
553 /* classes */
554 d_exchange(tmp_class_dir, fsi->class_dir);
555 fsi->class_dir = tmp_class_dir;
556
557 unlock_rename(tmp_parent, fsi->sb->s_root);
558
559out:
560 sel_remove_old_bool_data(bool_num, bool_names, bool_values);
561 /* Since the other temporary dirs are children of tmp_parent
562 * this will handle all the cleanup in the case of a failure before
563 * the swapover
564 */
565 simple_recursive_removal(tmp_parent, NULL);
566
567 return ret;
568}
569
570static ssize_t sel_write_load(struct file *file, const char __user *buf,
571 size_t count, loff_t *ppos)
572
573{
574 struct selinux_fs_info *fsi;
575 struct selinux_load_state load_state;
576 ssize_t length;
577 void *data = NULL;
578
579 /* no partial writes */
580 if (*ppos)
581 return -EINVAL;
582 /* no empty policies */
583 if (!count)
584 return -EINVAL;
585
586 mutex_lock(&selinux_state.policy_mutex);
587
588 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
589 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
590 if (length)
591 goto out;
592
593 data = vmalloc(count);
594 if (!data) {
595 length = -ENOMEM;
596 goto out;
597 }
598 if (copy_from_user(data, buf, count) != 0) {
599 length = -EFAULT;
600 goto out;
601 }
602
603 length = security_load_policy(data, count, &load_state);
604 if (length) {
605 pr_warn_ratelimited("SELinux: failed to load policy\n");
606 goto out;
607 }
608 fsi = file_inode(file)->i_sb->s_fs_info;
609 length = sel_make_policy_nodes(fsi, load_state.policy);
610 if (length) {
611 pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
612 selinux_policy_cancel(&load_state);
613 goto out;
614 }
615
616 selinux_policy_commit(&load_state);
617 length = count;
618 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
619 "auid=%u ses=%u lsm=selinux res=1",
620 from_kuid(&init_user_ns, audit_get_loginuid(current)),
621 audit_get_sessionid(current));
622
623out:
624 mutex_unlock(&selinux_state.policy_mutex);
625 vfree(data);
626 return length;
627}
628
629static const struct file_operations sel_load_ops = {
630 .write = sel_write_load,
631 .llseek = generic_file_llseek,
632};
633
634static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
635{
636 char *canon = NULL;
637 u32 sid, len;
638 ssize_t length;
639
640 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
641 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
642 if (length)
643 goto out;
644
645 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
646 if (length)
647 goto out;
648
649 length = security_sid_to_context(sid, &canon, &len);
650 if (length)
651 goto out;
652
653 length = -ERANGE;
654 if (len > SIMPLE_TRANSACTION_LIMIT) {
655 pr_err("SELinux: %s: context size (%u) exceeds "
656 "payload max\n", __func__, len);
657 goto out;
658 }
659
660 memcpy(buf, canon, len);
661 length = len;
662out:
663 kfree(canon);
664 return length;
665}
666
667static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
668 size_t count, loff_t *ppos)
669{
670 char tmpbuf[TMPBUFLEN];
671 ssize_t length;
672
673 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
674 checkreqprot_get());
675 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
676}
677
678static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
679 size_t count, loff_t *ppos)
680{
681 char *page;
682 ssize_t length;
683 unsigned int new_value;
684
685 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
686 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
687 NULL);
688 if (length)
689 return length;
690
691 if (count >= PAGE_SIZE)
692 return -ENOMEM;
693
694 /* No partial writes. */
695 if (*ppos != 0)
696 return -EINVAL;
697
698 page = memdup_user_nul(buf, count);
699 if (IS_ERR(page))
700 return PTR_ERR(page);
701
702 if (sscanf(page, "%u", &new_value) != 1) {
703 length = -EINVAL;
704 goto out;
705 }
706 length = count;
707
708 if (new_value) {
709 char comm[sizeof(current->comm)];
710
711 strscpy(comm, current->comm);
712 pr_err("SELinux: %s (%d) set checkreqprot to 1. This is no longer supported.\n",
713 comm, current->pid);
714 }
715
716 selinux_ima_measure_state();
717
718out:
719 kfree(page);
720 return length;
721}
722static const struct file_operations sel_checkreqprot_ops = {
723 .read = sel_read_checkreqprot,
724 .write = sel_write_checkreqprot,
725 .llseek = generic_file_llseek,
726};
727
728static ssize_t sel_write_validatetrans(struct file *file,
729 const char __user *buf,
730 size_t count, loff_t *ppos)
731{
732 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
733 char *req = NULL;
734 u32 osid, nsid, tsid;
735 u16 tclass;
736 int rc;
737
738 rc = avc_has_perm(current_sid(), SECINITSID_SECURITY,
739 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
740 if (rc)
741 goto out;
742
743 rc = -ENOMEM;
744 if (count >= PAGE_SIZE)
745 goto out;
746
747 /* No partial writes. */
748 rc = -EINVAL;
749 if (*ppos != 0)
750 goto out;
751
752 req = memdup_user_nul(buf, count);
753 if (IS_ERR(req)) {
754 rc = PTR_ERR(req);
755 req = NULL;
756 goto out;
757 }
758
759 rc = -ENOMEM;
760 oldcon = kzalloc(count + 1, GFP_KERNEL);
761 if (!oldcon)
762 goto out;
763
764 newcon = kzalloc(count + 1, GFP_KERNEL);
765 if (!newcon)
766 goto out;
767
768 taskcon = kzalloc(count + 1, GFP_KERNEL);
769 if (!taskcon)
770 goto out;
771
772 rc = -EINVAL;
773 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
774 goto out;
775
776 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
777 if (rc)
778 goto out;
779
780 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
781 if (rc)
782 goto out;
783
784 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
785 if (rc)
786 goto out;
787
788 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
789 if (!rc)
790 rc = count;
791out:
792 kfree(req);
793 kfree(oldcon);
794 kfree(newcon);
795 kfree(taskcon);
796 return rc;
797}
798
799static const struct file_operations sel_transition_ops = {
800 .write = sel_write_validatetrans,
801 .llseek = generic_file_llseek,
802};
803
804/*
805 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
806 */
807static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
808static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
809static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
810static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
811static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
812
813static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
814 [SEL_ACCESS] = sel_write_access,
815 [SEL_CREATE] = sel_write_create,
816 [SEL_RELABEL] = sel_write_relabel,
817 [SEL_USER] = sel_write_user,
818 [SEL_MEMBER] = sel_write_member,
819 [SEL_CONTEXT] = sel_write_context,
820};
821
822static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
823{
824 ino_t ino = file_inode(file)->i_ino;
825 char *data;
826 ssize_t rv;
827
828 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
829 return -EINVAL;
830
831 data = simple_transaction_get(file, buf, size);
832 if (IS_ERR(data))
833 return PTR_ERR(data);
834
835 rv = write_op[ino](file, data, size);
836 if (rv > 0) {
837 simple_transaction_set(file, rv);
838 rv = size;
839 }
840 return rv;
841}
842
843static const struct file_operations transaction_ops = {
844 .write = selinux_transaction_write,
845 .read = simple_transaction_read,
846 .release = simple_transaction_release,
847 .llseek = generic_file_llseek,
848};
849
850/*
851 * payload - write methods
852 * If the method has a response, the response should be put in buf,
853 * and the length returned. Otherwise return 0 or and -error.
854 */
855
856static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
857{
858 char *scon = NULL, *tcon = NULL;
859 u32 ssid, tsid;
860 u16 tclass;
861 struct av_decision avd;
862 ssize_t length;
863
864 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
865 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
866 if (length)
867 goto out;
868
869 length = -ENOMEM;
870 scon = kzalloc(size + 1, GFP_KERNEL);
871 if (!scon)
872 goto out;
873
874 length = -ENOMEM;
875 tcon = kzalloc(size + 1, GFP_KERNEL);
876 if (!tcon)
877 goto out;
878
879 length = -EINVAL;
880 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
881 goto out;
882
883 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
884 if (length)
885 goto out;
886
887 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
888 if (length)
889 goto out;
890
891 security_compute_av_user(ssid, tsid, tclass, &avd);
892
893 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
894 "%x %x %x %x %u %x",
895 avd.allowed, 0xffffffff,
896 avd.auditallow, avd.auditdeny,
897 avd.seqno, avd.flags);
898out:
899 kfree(tcon);
900 kfree(scon);
901 return length;
902}
903
904static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
905{
906 char *scon = NULL, *tcon = NULL;
907 char *namebuf = NULL, *objname = NULL;
908 u32 ssid, tsid, newsid;
909 u16 tclass;
910 ssize_t length;
911 char *newcon = NULL;
912 u32 len;
913 int nargs;
914
915 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
916 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
917 NULL);
918 if (length)
919 goto out;
920
921 length = -ENOMEM;
922 scon = kzalloc(size + 1, GFP_KERNEL);
923 if (!scon)
924 goto out;
925
926 length = -ENOMEM;
927 tcon = kzalloc(size + 1, GFP_KERNEL);
928 if (!tcon)
929 goto out;
930
931 length = -ENOMEM;
932 namebuf = kzalloc(size + 1, GFP_KERNEL);
933 if (!namebuf)
934 goto out;
935
936 length = -EINVAL;
937 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
938 if (nargs < 3 || nargs > 4)
939 goto out;
940 if (nargs == 4) {
941 /*
942 * If and when the name of new object to be queried contains
943 * either whitespace or multibyte characters, they shall be
944 * encoded based on the percentage-encoding rule.
945 * If not encoded, the sscanf logic picks up only left-half
946 * of the supplied name; split by a whitespace unexpectedly.
947 */
948 char *r, *w;
949 int c1, c2;
950
951 r = w = namebuf;
952 do {
953 c1 = *r++;
954 if (c1 == '+')
955 c1 = ' ';
956 else if (c1 == '%') {
957 c1 = hex_to_bin(*r++);
958 if (c1 < 0)
959 goto out;
960 c2 = hex_to_bin(*r++);
961 if (c2 < 0)
962 goto out;
963 c1 = (c1 << 4) | c2;
964 }
965 *w++ = c1;
966 } while (c1 != '\0');
967
968 objname = namebuf;
969 }
970
971 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
972 if (length)
973 goto out;
974
975 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
976 if (length)
977 goto out;
978
979 length = security_transition_sid_user(ssid, tsid, tclass,
980 objname, &newsid);
981 if (length)
982 goto out;
983
984 length = security_sid_to_context(newsid, &newcon, &len);
985 if (length)
986 goto out;
987
988 length = -ERANGE;
989 if (len > SIMPLE_TRANSACTION_LIMIT) {
990 pr_err("SELinux: %s: context size (%u) exceeds "
991 "payload max\n", __func__, len);
992 goto out;
993 }
994
995 memcpy(buf, newcon, len);
996 length = len;
997out:
998 kfree(newcon);
999 kfree(namebuf);
1000 kfree(tcon);
1001 kfree(scon);
1002 return length;
1003}
1004
1005static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1006{
1007 char *scon = NULL, *tcon = NULL;
1008 u32 ssid, tsid, newsid;
1009 u16 tclass;
1010 ssize_t length;
1011 char *newcon = NULL;
1012 u32 len;
1013
1014 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1015 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1016 NULL);
1017 if (length)
1018 goto out;
1019
1020 length = -ENOMEM;
1021 scon = kzalloc(size + 1, GFP_KERNEL);
1022 if (!scon)
1023 goto out;
1024
1025 length = -ENOMEM;
1026 tcon = kzalloc(size + 1, GFP_KERNEL);
1027 if (!tcon)
1028 goto out;
1029
1030 length = -EINVAL;
1031 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1032 goto out;
1033
1034 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1035 if (length)
1036 goto out;
1037
1038 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1039 if (length)
1040 goto out;
1041
1042 length = security_change_sid(ssid, tsid, tclass, &newsid);
1043 if (length)
1044 goto out;
1045
1046 length = security_sid_to_context(newsid, &newcon, &len);
1047 if (length)
1048 goto out;
1049
1050 length = -ERANGE;
1051 if (len > SIMPLE_TRANSACTION_LIMIT)
1052 goto out;
1053
1054 memcpy(buf, newcon, len);
1055 length = len;
1056out:
1057 kfree(newcon);
1058 kfree(tcon);
1059 kfree(scon);
1060 return length;
1061}
1062
1063static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1064{
1065 char *con = NULL, *user = NULL, *ptr;
1066 u32 sid, *sids = NULL;
1067 ssize_t length;
1068 char *newcon;
1069 int rc;
1070 u32 i, len, nsids;
1071
1072 pr_warn_ratelimited("SELinux: %s (%d) wrote to /sys/fs/selinux/user!"
1073 " This will not be supported in the future; please update your"
1074 " userspace.\n", current->comm, current->pid);
1075
1076 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1077 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1078 NULL);
1079 if (length)
1080 goto out;
1081
1082 length = -ENOMEM;
1083 con = kzalloc(size + 1, GFP_KERNEL);
1084 if (!con)
1085 goto out;
1086
1087 length = -ENOMEM;
1088 user = kzalloc(size + 1, GFP_KERNEL);
1089 if (!user)
1090 goto out;
1091
1092 length = -EINVAL;
1093 if (sscanf(buf, "%s %s", con, user) != 2)
1094 goto out;
1095
1096 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
1097 if (length)
1098 goto out;
1099
1100 length = security_get_user_sids(sid, user, &sids, &nsids);
1101 if (length)
1102 goto out;
1103
1104 length = sprintf(buf, "%u", nsids) + 1;
1105 ptr = buf + length;
1106 for (i = 0; i < nsids; i++) {
1107 rc = security_sid_to_context(sids[i], &newcon, &len);
1108 if (rc) {
1109 length = rc;
1110 goto out;
1111 }
1112 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1113 kfree(newcon);
1114 length = -ERANGE;
1115 goto out;
1116 }
1117 memcpy(ptr, newcon, len);
1118 kfree(newcon);
1119 ptr += len;
1120 length += len;
1121 }
1122out:
1123 kfree(sids);
1124 kfree(user);
1125 kfree(con);
1126 return length;
1127}
1128
1129static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1130{
1131 char *scon = NULL, *tcon = NULL;
1132 u32 ssid, tsid, newsid;
1133 u16 tclass;
1134 ssize_t length;
1135 char *newcon = NULL;
1136 u32 len;
1137
1138 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1139 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1140 NULL);
1141 if (length)
1142 goto out;
1143
1144 length = -ENOMEM;
1145 scon = kzalloc(size + 1, GFP_KERNEL);
1146 if (!scon)
1147 goto out;
1148
1149 length = -ENOMEM;
1150 tcon = kzalloc(size + 1, GFP_KERNEL);
1151 if (!tcon)
1152 goto out;
1153
1154 length = -EINVAL;
1155 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1156 goto out;
1157
1158 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1159 if (length)
1160 goto out;
1161
1162 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1163 if (length)
1164 goto out;
1165
1166 length = security_member_sid(ssid, tsid, tclass, &newsid);
1167 if (length)
1168 goto out;
1169
1170 length = security_sid_to_context(newsid, &newcon, &len);
1171 if (length)
1172 goto out;
1173
1174 length = -ERANGE;
1175 if (len > SIMPLE_TRANSACTION_LIMIT) {
1176 pr_err("SELinux: %s: context size (%u) exceeds "
1177 "payload max\n", __func__, len);
1178 goto out;
1179 }
1180
1181 memcpy(buf, newcon, len);
1182 length = len;
1183out:
1184 kfree(newcon);
1185 kfree(tcon);
1186 kfree(scon);
1187 return length;
1188}
1189
1190static struct inode *sel_make_inode(struct super_block *sb, umode_t mode)
1191{
1192 struct inode *ret = new_inode(sb);
1193
1194 if (ret) {
1195 ret->i_mode = mode;
1196 simple_inode_init_ts(ret);
1197 }
1198 return ret;
1199}
1200
1201static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1202 size_t count, loff_t *ppos)
1203{
1204 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1205 char *page = NULL;
1206 ssize_t length;
1207 ssize_t ret;
1208 int cur_enforcing;
1209 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1210 const char *name = filep->f_path.dentry->d_name.name;
1211
1212 mutex_lock(&selinux_state.policy_mutex);
1213
1214 ret = -EINVAL;
1215 if (index >= fsi->bool_num || strcmp(name,
1216 fsi->bool_pending_names[index]))
1217 goto out_unlock;
1218
1219 ret = -ENOMEM;
1220 page = (char *)get_zeroed_page(GFP_KERNEL);
1221 if (!page)
1222 goto out_unlock;
1223
1224 cur_enforcing = security_get_bool_value(index);
1225 if (cur_enforcing < 0) {
1226 ret = cur_enforcing;
1227 goto out_unlock;
1228 }
1229 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1230 fsi->bool_pending_values[index]);
1231 mutex_unlock(&selinux_state.policy_mutex);
1232 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1233out_free:
1234 free_page((unsigned long)page);
1235 return ret;
1236
1237out_unlock:
1238 mutex_unlock(&selinux_state.policy_mutex);
1239 goto out_free;
1240}
1241
1242static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1243 size_t count, loff_t *ppos)
1244{
1245 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1246 char *page = NULL;
1247 ssize_t length;
1248 int new_value;
1249 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1250 const char *name = filep->f_path.dentry->d_name.name;
1251
1252 if (count >= PAGE_SIZE)
1253 return -ENOMEM;
1254
1255 /* No partial writes. */
1256 if (*ppos != 0)
1257 return -EINVAL;
1258
1259 page = memdup_user_nul(buf, count);
1260 if (IS_ERR(page))
1261 return PTR_ERR(page);
1262
1263 mutex_lock(&selinux_state.policy_mutex);
1264
1265 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1266 SECCLASS_SECURITY, SECURITY__SETBOOL,
1267 NULL);
1268 if (length)
1269 goto out;
1270
1271 length = -EINVAL;
1272 if (index >= fsi->bool_num || strcmp(name,
1273 fsi->bool_pending_names[index]))
1274 goto out;
1275
1276 length = -EINVAL;
1277 if (sscanf(page, "%d", &new_value) != 1)
1278 goto out;
1279
1280 if (new_value)
1281 new_value = 1;
1282
1283 fsi->bool_pending_values[index] = new_value;
1284 length = count;
1285
1286out:
1287 mutex_unlock(&selinux_state.policy_mutex);
1288 kfree(page);
1289 return length;
1290}
1291
1292static const struct file_operations sel_bool_ops = {
1293 .read = sel_read_bool,
1294 .write = sel_write_bool,
1295 .llseek = generic_file_llseek,
1296};
1297
1298static ssize_t sel_commit_bools_write(struct file *filep,
1299 const char __user *buf,
1300 size_t count, loff_t *ppos)
1301{
1302 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1303 char *page = NULL;
1304 ssize_t length;
1305 int new_value;
1306
1307 if (count >= PAGE_SIZE)
1308 return -ENOMEM;
1309
1310 /* No partial writes. */
1311 if (*ppos != 0)
1312 return -EINVAL;
1313
1314 page = memdup_user_nul(buf, count);
1315 if (IS_ERR(page))
1316 return PTR_ERR(page);
1317
1318 mutex_lock(&selinux_state.policy_mutex);
1319
1320 length = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1321 SECCLASS_SECURITY, SECURITY__SETBOOL,
1322 NULL);
1323 if (length)
1324 goto out;
1325
1326 length = -EINVAL;
1327 if (sscanf(page, "%d", &new_value) != 1)
1328 goto out;
1329
1330 length = 0;
1331 if (new_value && fsi->bool_pending_values)
1332 length = security_set_bools(fsi->bool_num,
1333 fsi->bool_pending_values);
1334
1335 if (!length)
1336 length = count;
1337
1338out:
1339 mutex_unlock(&selinux_state.policy_mutex);
1340 kfree(page);
1341 return length;
1342}
1343
1344static const struct file_operations sel_commit_bools_ops = {
1345 .write = sel_commit_bools_write,
1346 .llseek = generic_file_llseek,
1347};
1348
1349static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1350 unsigned int *bool_num, char ***bool_pending_names,
1351 int **bool_pending_values)
1352{
1353 int ret;
1354 char **names, *page;
1355 u32 i, num;
1356
1357 page = (char *)get_zeroed_page(GFP_KERNEL);
1358 if (!page)
1359 return -ENOMEM;
1360
1361 ret = security_get_bools(newpolicy, &num, &names, bool_pending_values);
1362 if (ret)
1363 goto out;
1364
1365 *bool_num = num;
1366 *bool_pending_names = names;
1367
1368 for (i = 0; i < num; i++) {
1369 struct dentry *dentry;
1370 struct inode *inode;
1371 struct inode_security_struct *isec;
1372 ssize_t len;
1373 u32 sid;
1374
1375 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1376 if (len >= PAGE_SIZE) {
1377 ret = -ENAMETOOLONG;
1378 break;
1379 }
1380 dentry = d_alloc_name(bool_dir, names[i]);
1381 if (!dentry) {
1382 ret = -ENOMEM;
1383 break;
1384 }
1385
1386 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1387 if (!inode) {
1388 dput(dentry);
1389 ret = -ENOMEM;
1390 break;
1391 }
1392
1393 isec = selinux_inode(inode);
1394 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1395 SECCLASS_FILE, &sid);
1396 if (ret) {
1397 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1398 page);
1399 sid = SECINITSID_SECURITY;
1400 }
1401
1402 isec->sid = sid;
1403 isec->initialized = LABEL_INITIALIZED;
1404 inode->i_fop = &sel_bool_ops;
1405 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1406 d_add(dentry, inode);
1407 }
1408out:
1409 free_page((unsigned long)page);
1410 return ret;
1411}
1412
1413static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1414 size_t count, loff_t *ppos)
1415{
1416 char tmpbuf[TMPBUFLEN];
1417 ssize_t length;
1418
1419 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1420 avc_get_cache_threshold());
1421 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1422}
1423
1424static ssize_t sel_write_avc_cache_threshold(struct file *file,
1425 const char __user *buf,
1426 size_t count, loff_t *ppos)
1427
1428{
1429 char *page;
1430 ssize_t ret;
1431 unsigned int new_value;
1432
1433 ret = avc_has_perm(current_sid(), SECINITSID_SECURITY,
1434 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1435 NULL);
1436 if (ret)
1437 return ret;
1438
1439 if (count >= PAGE_SIZE)
1440 return -ENOMEM;
1441
1442 /* No partial writes. */
1443 if (*ppos != 0)
1444 return -EINVAL;
1445
1446 page = memdup_user_nul(buf, count);
1447 if (IS_ERR(page))
1448 return PTR_ERR(page);
1449
1450 ret = -EINVAL;
1451 if (sscanf(page, "%u", &new_value) != 1)
1452 goto out;
1453
1454 avc_set_cache_threshold(new_value);
1455
1456 ret = count;
1457out:
1458 kfree(page);
1459 return ret;
1460}
1461
1462static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1463 size_t count, loff_t *ppos)
1464{
1465 char *page;
1466 ssize_t length;
1467
1468 page = (char *)__get_free_page(GFP_KERNEL);
1469 if (!page)
1470 return -ENOMEM;
1471
1472 length = avc_get_hash_stats(page);
1473 if (length >= 0)
1474 length = simple_read_from_buffer(buf, count, ppos, page, length);
1475 free_page((unsigned long)page);
1476
1477 return length;
1478}
1479
1480static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1481 size_t count, loff_t *ppos)
1482{
1483 char *page;
1484 ssize_t length;
1485
1486 page = (char *)__get_free_page(GFP_KERNEL);
1487 if (!page)
1488 return -ENOMEM;
1489
1490 length = security_sidtab_hash_stats(page);
1491 if (length >= 0)
1492 length = simple_read_from_buffer(buf, count, ppos, page,
1493 length);
1494 free_page((unsigned long)page);
1495
1496 return length;
1497}
1498
1499static const struct file_operations sel_sidtab_hash_stats_ops = {
1500 .read = sel_read_sidtab_hash_stats,
1501 .llseek = generic_file_llseek,
1502};
1503
1504static const struct file_operations sel_avc_cache_threshold_ops = {
1505 .read = sel_read_avc_cache_threshold,
1506 .write = sel_write_avc_cache_threshold,
1507 .llseek = generic_file_llseek,
1508};
1509
1510static const struct file_operations sel_avc_hash_stats_ops = {
1511 .read = sel_read_avc_hash_stats,
1512 .llseek = generic_file_llseek,
1513};
1514
1515#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1516static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1517{
1518 int cpu;
1519
1520 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1521 if (!cpu_possible(cpu))
1522 continue;
1523 *idx = cpu + 1;
1524 return &per_cpu(avc_cache_stats, cpu);
1525 }
1526 (*idx)++;
1527 return NULL;
1528}
1529
1530static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1531{
1532 loff_t n = *pos - 1;
1533
1534 if (*pos == 0)
1535 return SEQ_START_TOKEN;
1536
1537 return sel_avc_get_stat_idx(&n);
1538}
1539
1540static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1541{
1542 return sel_avc_get_stat_idx(pos);
1543}
1544
1545static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1546{
1547 struct avc_cache_stats *st = v;
1548
1549 if (v == SEQ_START_TOKEN) {
1550 seq_puts(seq,
1551 "lookups hits misses allocations reclaims frees\n");
1552 } else {
1553 unsigned int lookups = st->lookups;
1554 unsigned int misses = st->misses;
1555 unsigned int hits = lookups - misses;
1556 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1557 hits, misses, st->allocations,
1558 st->reclaims, st->frees);
1559 }
1560 return 0;
1561}
1562
1563static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1564{ }
1565
1566static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1567 .start = sel_avc_stats_seq_start,
1568 .next = sel_avc_stats_seq_next,
1569 .show = sel_avc_stats_seq_show,
1570 .stop = sel_avc_stats_seq_stop,
1571};
1572
1573static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1574{
1575 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1576}
1577
1578static const struct file_operations sel_avc_cache_stats_ops = {
1579 .open = sel_open_avc_cache_stats,
1580 .read = seq_read,
1581 .llseek = seq_lseek,
1582 .release = seq_release,
1583};
1584#endif
1585
1586static int sel_make_avc_files(struct dentry *dir)
1587{
1588 struct super_block *sb = dir->d_sb;
1589 struct selinux_fs_info *fsi = sb->s_fs_info;
1590 unsigned int i;
1591 static const struct tree_descr files[] = {
1592 { "cache_threshold",
1593 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1594 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1595#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1596 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1597#endif
1598 };
1599
1600 for (i = 0; i < ARRAY_SIZE(files); i++) {
1601 struct inode *inode;
1602 struct dentry *dentry;
1603
1604 dentry = d_alloc_name(dir, files[i].name);
1605 if (!dentry)
1606 return -ENOMEM;
1607
1608 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1609 if (!inode) {
1610 dput(dentry);
1611 return -ENOMEM;
1612 }
1613
1614 inode->i_fop = files[i].ops;
1615 inode->i_ino = ++fsi->last_ino;
1616 d_add(dentry, inode);
1617 }
1618
1619 return 0;
1620}
1621
1622static int sel_make_ss_files(struct dentry *dir)
1623{
1624 struct super_block *sb = dir->d_sb;
1625 struct selinux_fs_info *fsi = sb->s_fs_info;
1626 unsigned int i;
1627 static const struct tree_descr files[] = {
1628 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1629 };
1630
1631 for (i = 0; i < ARRAY_SIZE(files); i++) {
1632 struct inode *inode;
1633 struct dentry *dentry;
1634
1635 dentry = d_alloc_name(dir, files[i].name);
1636 if (!dentry)
1637 return -ENOMEM;
1638
1639 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1640 if (!inode) {
1641 dput(dentry);
1642 return -ENOMEM;
1643 }
1644
1645 inode->i_fop = files[i].ops;
1646 inode->i_ino = ++fsi->last_ino;
1647 d_add(dentry, inode);
1648 }
1649
1650 return 0;
1651}
1652
1653static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1654 size_t count, loff_t *ppos)
1655{
1656 char *con;
1657 u32 sid, len;
1658 ssize_t ret;
1659
1660 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1661 ret = security_sid_to_context(sid, &con, &len);
1662 if (ret)
1663 return ret;
1664
1665 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1666 kfree(con);
1667 return ret;
1668}
1669
1670static const struct file_operations sel_initcon_ops = {
1671 .read = sel_read_initcon,
1672 .llseek = generic_file_llseek,
1673};
1674
1675static int sel_make_initcon_files(struct dentry *dir)
1676{
1677 unsigned int i;
1678
1679 for (i = 1; i <= SECINITSID_NUM; i++) {
1680 struct inode *inode;
1681 struct dentry *dentry;
1682 const char *s = security_get_initial_sid_context(i);
1683
1684 if (!s)
1685 continue;
1686 dentry = d_alloc_name(dir, s);
1687 if (!dentry)
1688 return -ENOMEM;
1689
1690 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1691 if (!inode) {
1692 dput(dentry);
1693 return -ENOMEM;
1694 }
1695
1696 inode->i_fop = &sel_initcon_ops;
1697 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1698 d_add(dentry, inode);
1699 }
1700
1701 return 0;
1702}
1703
1704static inline unsigned long sel_class_to_ino(u16 class)
1705{
1706 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1707}
1708
1709static inline u16 sel_ino_to_class(unsigned long ino)
1710{
1711 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1712}
1713
1714static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1715{
1716 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1717}
1718
1719static inline u32 sel_ino_to_perm(unsigned long ino)
1720{
1721 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1722}
1723
1724static ssize_t sel_read_class(struct file *file, char __user *buf,
1725 size_t count, loff_t *ppos)
1726{
1727 unsigned long ino = file_inode(file)->i_ino;
1728 char res[TMPBUFLEN];
1729 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1730 return simple_read_from_buffer(buf, count, ppos, res, len);
1731}
1732
1733static const struct file_operations sel_class_ops = {
1734 .read = sel_read_class,
1735 .llseek = generic_file_llseek,
1736};
1737
1738static ssize_t sel_read_perm(struct file *file, char __user *buf,
1739 size_t count, loff_t *ppos)
1740{
1741 unsigned long ino = file_inode(file)->i_ino;
1742 char res[TMPBUFLEN];
1743 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1744 return simple_read_from_buffer(buf, count, ppos, res, len);
1745}
1746
1747static const struct file_operations sel_perm_ops = {
1748 .read = sel_read_perm,
1749 .llseek = generic_file_llseek,
1750};
1751
1752static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1753 size_t count, loff_t *ppos)
1754{
1755 int value;
1756 char tmpbuf[TMPBUFLEN];
1757 ssize_t length;
1758 unsigned long i_ino = file_inode(file)->i_ino;
1759
1760 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1761 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1762
1763 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1764}
1765
1766static const struct file_operations sel_policycap_ops = {
1767 .read = sel_read_policycap,
1768 .llseek = generic_file_llseek,
1769};
1770
1771static int sel_make_perm_files(struct selinux_policy *newpolicy,
1772 char *objclass, int classvalue,
1773 struct dentry *dir)
1774{
1775 u32 i, nperms;
1776 int rc;
1777 char **perms;
1778
1779 rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1780 if (rc)
1781 return rc;
1782
1783 for (i = 0; i < nperms; i++) {
1784 struct inode *inode;
1785 struct dentry *dentry;
1786
1787 rc = -ENOMEM;
1788 dentry = d_alloc_name(dir, perms[i]);
1789 if (!dentry)
1790 goto out;
1791
1792 rc = -ENOMEM;
1793 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1794 if (!inode) {
1795 dput(dentry);
1796 goto out;
1797 }
1798
1799 inode->i_fop = &sel_perm_ops;
1800 /* i+1 since perm values are 1-indexed */
1801 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1802 d_add(dentry, inode);
1803 }
1804 rc = 0;
1805out:
1806 for (i = 0; i < nperms; i++)
1807 kfree(perms[i]);
1808 kfree(perms);
1809 return rc;
1810}
1811
1812static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1813 char *classname, int index,
1814 struct dentry *dir)
1815{
1816 struct super_block *sb = dir->d_sb;
1817 struct selinux_fs_info *fsi = sb->s_fs_info;
1818 struct dentry *dentry = NULL;
1819 struct inode *inode = NULL;
1820
1821 dentry = d_alloc_name(dir, "index");
1822 if (!dentry)
1823 return -ENOMEM;
1824
1825 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1826 if (!inode) {
1827 dput(dentry);
1828 return -ENOMEM;
1829 }
1830
1831 inode->i_fop = &sel_class_ops;
1832 inode->i_ino = sel_class_to_ino(index);
1833 d_add(dentry, inode);
1834
1835 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1836 if (IS_ERR(dentry))
1837 return PTR_ERR(dentry);
1838
1839 return sel_make_perm_files(newpolicy, classname, index, dentry);
1840}
1841
1842static int sel_make_classes(struct selinux_policy *newpolicy,
1843 struct dentry *class_dir,
1844 unsigned long *last_class_ino)
1845{
1846 u32 i, nclasses;
1847 int rc;
1848 char **classes;
1849
1850 rc = security_get_classes(newpolicy, &classes, &nclasses);
1851 if (rc)
1852 return rc;
1853
1854 /* +2 since classes are 1-indexed */
1855 *last_class_ino = sel_class_to_ino(nclasses + 2);
1856
1857 for (i = 0; i < nclasses; i++) {
1858 struct dentry *class_name_dir;
1859
1860 class_name_dir = sel_make_dir(class_dir, classes[i],
1861 last_class_ino);
1862 if (IS_ERR(class_name_dir)) {
1863 rc = PTR_ERR(class_name_dir);
1864 goto out;
1865 }
1866
1867 /* i+1 since class values are 1-indexed */
1868 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1869 class_name_dir);
1870 if (rc)
1871 goto out;
1872 }
1873 rc = 0;
1874out:
1875 for (i = 0; i < nclasses; i++)
1876 kfree(classes[i]);
1877 kfree(classes);
1878 return rc;
1879}
1880
1881static int sel_make_policycap(struct selinux_fs_info *fsi)
1882{
1883 unsigned int iter;
1884 struct dentry *dentry = NULL;
1885 struct inode *inode = NULL;
1886
1887 for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
1888 if (iter < ARRAY_SIZE(selinux_policycap_names))
1889 dentry = d_alloc_name(fsi->policycap_dir,
1890 selinux_policycap_names[iter]);
1891 else
1892 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1893
1894 if (dentry == NULL)
1895 return -ENOMEM;
1896
1897 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1898 if (inode == NULL) {
1899 dput(dentry);
1900 return -ENOMEM;
1901 }
1902
1903 inode->i_fop = &sel_policycap_ops;
1904 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1905 d_add(dentry, inode);
1906 }
1907
1908 return 0;
1909}
1910
1911static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1912 unsigned long *ino)
1913{
1914 struct dentry *dentry = d_alloc_name(dir, name);
1915 struct inode *inode;
1916
1917 if (!dentry)
1918 return ERR_PTR(-ENOMEM);
1919
1920 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1921 if (!inode) {
1922 dput(dentry);
1923 return ERR_PTR(-ENOMEM);
1924 }
1925
1926 inode->i_op = &simple_dir_inode_operations;
1927 inode->i_fop = &simple_dir_operations;
1928 inode->i_ino = ++(*ino);
1929 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1930 inc_nlink(inode);
1931 d_add(dentry, inode);
1932 /* bump link count on parent directory, too */
1933 inc_nlink(d_inode(dir));
1934
1935 return dentry;
1936}
1937
1938static int reject_all(struct mnt_idmap *idmap, struct inode *inode, int mask)
1939{
1940 return -EPERM; // no access for anyone, root or no root.
1941}
1942
1943static const struct inode_operations swapover_dir_inode_operations = {
1944 .lookup = simple_lookup,
1945 .permission = reject_all,
1946};
1947
1948static struct dentry *sel_make_swapover_dir(struct super_block *sb,
1949 unsigned long *ino)
1950{
1951 struct dentry *dentry = d_alloc_name(sb->s_root, ".swapover");
1952 struct inode *inode;
1953
1954 if (!dentry)
1955 return ERR_PTR(-ENOMEM);
1956
1957 inode = sel_make_inode(sb, S_IFDIR);
1958 if (!inode) {
1959 dput(dentry);
1960 return ERR_PTR(-ENOMEM);
1961 }
1962
1963 inode->i_op = &swapover_dir_inode_operations;
1964 inode->i_ino = ++(*ino);
1965 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1966 inc_nlink(inode);
1967 inode_lock(sb->s_root->d_inode);
1968 d_add(dentry, inode);
1969 inc_nlink(sb->s_root->d_inode);
1970 inode_unlock(sb->s_root->d_inode);
1971 return dentry;
1972}
1973
1974#define NULL_FILE_NAME "null"
1975
1976static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1977{
1978 struct selinux_fs_info *fsi;
1979 int ret;
1980 struct dentry *dentry;
1981 struct inode *inode;
1982 struct inode_security_struct *isec;
1983
1984 static const struct tree_descr selinux_files[] = {
1985 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1986 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1987 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1988 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1989 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1990 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1991 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1992 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1993 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1994 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1995 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1996 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1997 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1998 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1999 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2000 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2001 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2002 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2003 S_IWUGO},
2004 /* last one */ {""}
2005 };
2006
2007 ret = selinux_fs_info_create(sb);
2008 if (ret)
2009 goto err;
2010
2011 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2012 if (ret)
2013 goto err;
2014
2015 fsi = sb->s_fs_info;
2016 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2017 if (IS_ERR(fsi->bool_dir)) {
2018 ret = PTR_ERR(fsi->bool_dir);
2019 fsi->bool_dir = NULL;
2020 goto err;
2021 }
2022
2023 ret = -ENOMEM;
2024 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2025 if (!dentry)
2026 goto err;
2027
2028 ret = -ENOMEM;
2029 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2030 if (!inode) {
2031 dput(dentry);
2032 goto err;
2033 }
2034
2035 inode->i_ino = ++fsi->last_ino;
2036 isec = selinux_inode(inode);
2037 isec->sid = SECINITSID_DEVNULL;
2038 isec->sclass = SECCLASS_CHR_FILE;
2039 isec->initialized = LABEL_INITIALIZED;
2040
2041 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2042 d_add(dentry, inode);
2043
2044 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2045 if (IS_ERR(dentry)) {
2046 ret = PTR_ERR(dentry);
2047 goto err;
2048 }
2049
2050 ret = sel_make_avc_files(dentry);
2051 if (ret)
2052 goto err;
2053
2054 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2055 if (IS_ERR(dentry)) {
2056 ret = PTR_ERR(dentry);
2057 goto err;
2058 }
2059
2060 ret = sel_make_ss_files(dentry);
2061 if (ret)
2062 goto err;
2063
2064 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2065 if (IS_ERR(dentry)) {
2066 ret = PTR_ERR(dentry);
2067 goto err;
2068 }
2069
2070 ret = sel_make_initcon_files(dentry);
2071 if (ret)
2072 goto err;
2073
2074 fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2075 if (IS_ERR(fsi->class_dir)) {
2076 ret = PTR_ERR(fsi->class_dir);
2077 fsi->class_dir = NULL;
2078 goto err;
2079 }
2080
2081 fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2082 &fsi->last_ino);
2083 if (IS_ERR(fsi->policycap_dir)) {
2084 ret = PTR_ERR(fsi->policycap_dir);
2085 fsi->policycap_dir = NULL;
2086 goto err;
2087 }
2088
2089 ret = sel_make_policycap(fsi);
2090 if (ret) {
2091 pr_err("SELinux: failed to load policy capabilities\n");
2092 goto err;
2093 }
2094
2095 return 0;
2096err:
2097 pr_err("SELinux: %s: failed while creating inodes\n",
2098 __func__);
2099
2100 selinux_fs_info_free(sb);
2101
2102 return ret;
2103}
2104
2105static int sel_get_tree(struct fs_context *fc)
2106{
2107 return get_tree_single(fc, sel_fill_super);
2108}
2109
2110static const struct fs_context_operations sel_context_ops = {
2111 .get_tree = sel_get_tree,
2112};
2113
2114static int sel_init_fs_context(struct fs_context *fc)
2115{
2116 fc->ops = &sel_context_ops;
2117 return 0;
2118}
2119
2120static void sel_kill_sb(struct super_block *sb)
2121{
2122 selinux_fs_info_free(sb);
2123 kill_litter_super(sb);
2124}
2125
2126static struct file_system_type sel_fs_type = {
2127 .name = "selinuxfs",
2128 .init_fs_context = sel_init_fs_context,
2129 .kill_sb = sel_kill_sb,
2130};
2131
2132struct path selinux_null __ro_after_init;
2133
2134static int __init init_sel_fs(void)
2135{
2136 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2137 sizeof(NULL_FILE_NAME)-1);
2138 int err;
2139
2140 if (!selinux_enabled_boot)
2141 return 0;
2142
2143 err = sysfs_create_mount_point(fs_kobj, "selinux");
2144 if (err)
2145 return err;
2146
2147 err = register_filesystem(&sel_fs_type);
2148 if (err) {
2149 sysfs_remove_mount_point(fs_kobj, "selinux");
2150 return err;
2151 }
2152
2153 selinux_null.mnt = kern_mount(&sel_fs_type);
2154 if (IS_ERR(selinux_null.mnt)) {
2155 pr_err("selinuxfs: could not mount!\n");
2156 err = PTR_ERR(selinux_null.mnt);
2157 selinux_null.mnt = NULL;
2158 return err;
2159 }
2160
2161 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2162 &null_name);
2163 if (IS_ERR(selinux_null.dentry)) {
2164 pr_err("selinuxfs: could not lookup null!\n");
2165 err = PTR_ERR(selinux_null.dentry);
2166 selinux_null.dentry = NULL;
2167 return err;
2168 }
2169
2170 /*
2171 * Try to pre-allocate the status page, so the sequence number of the
2172 * initial policy load can be stored.
2173 */
2174 (void) selinux_kernel_status_page();
2175
2176 return err;
2177}
2178
2179__initcall(init_sel_fs);