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Merge tag 'block-5.11-2021-01-16' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blob4bde570d56a2ccd82b6c841df82ce8934d891f64
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
45 enum sel_inos {
46 SEL_ROOT_INO = 2,
47 SEL_LOAD, /* load policy */
48 SEL_ENFORCE, /* get or set enforcing status */
49 SEL_CONTEXT, /* validate context */
50 SEL_ACCESS, /* compute access decision */
51 SEL_CREATE, /* compute create labeling decision */
52 SEL_RELABEL, /* compute relabeling decision */
53 SEL_USER, /* compute reachable user contexts */
54 SEL_POLICYVERS, /* return policy version for this kernel */
55 SEL_COMMIT_BOOLS, /* commit new boolean values */
56 SEL_MLS, /* return if MLS policy is enabled */
57 SEL_DISABLE, /* disable SELinux until next reboot */
58 SEL_MEMBER, /* compute polyinstantiation membership decision */
59 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
60 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
61 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
62 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
63 SEL_STATUS, /* export current status using mmap() */
64 SEL_POLICY, /* allow userspace to read the in kernel policy */
65 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
66 SEL_INO_NEXT, /* The next inode number to use */
67 };
68
69 struct selinux_fs_info {
70 struct dentry *bool_dir;
71 unsigned int bool_num;
72 char **bool_pending_names;
73 unsigned int *bool_pending_values;
74 struct dentry *class_dir;
75 unsigned long last_class_ino;
76 bool policy_opened;
77 struct dentry *policycap_dir;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
81 };
82
83 static 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->state = &selinux_state;
93 fsi->sb = sb;
94 sb->s_fs_info = fsi;
95 return 0;
96 }
97
98 static void selinux_fs_info_free(struct super_block *sb)
99 {
100 struct selinux_fs_info *fsi = sb->s_fs_info;
101 int i;
102
103 if (fsi) {
104 for (i = 0; i < fsi->bool_num; i++)
105 kfree(fsi->bool_pending_names[i]);
106 kfree(fsi->bool_pending_names);
107 kfree(fsi->bool_pending_values);
108 }
109 kfree(sb->s_fs_info);
110 sb->s_fs_info = NULL;
111 }
112
113 #define SEL_INITCON_INO_OFFSET 0x01000000
114 #define SEL_BOOL_INO_OFFSET 0x02000000
115 #define SEL_CLASS_INO_OFFSET 0x04000000
116 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
117 #define SEL_INO_MASK 0x00ffffff
118
119 #define BOOL_DIR_NAME "booleans"
120 #define CLASS_DIR_NAME "class"
121 #define POLICYCAP_DIR_NAME "policy_capabilities"
122
123 #define TMPBUFLEN 12
124 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
125 size_t count, loff_t *ppos)
126 {
127 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
128 char tmpbuf[TMPBUFLEN];
129 ssize_t length;
130
131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
132 enforcing_enabled(fsi->state));
133 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
134 }
135
136 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
137 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
138 size_t count, loff_t *ppos)
139
140 {
141 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
142 struct selinux_state *state = fsi->state;
143 char *page = NULL;
144 ssize_t length;
145 int old_value, new_value;
146
147 if (count >= PAGE_SIZE)
148 return -ENOMEM;
149
150 /* No partial writes. */
151 if (*ppos != 0)
152 return -EINVAL;
153
154 page = memdup_user_nul(buf, count);
155 if (IS_ERR(page))
156 return PTR_ERR(page);
157
158 length = -EINVAL;
159 if (sscanf(page, "%d", &new_value) != 1)
160 goto out;
161
162 new_value = !!new_value;
163
164 old_value = enforcing_enabled(state);
165 if (new_value != old_value) {
166 length = avc_has_perm(&selinux_state,
167 current_sid(), SECINITSID_SECURITY,
168 SECCLASS_SECURITY, SECURITY__SETENFORCE,
169 NULL);
170 if (length)
171 goto out;
172 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
173 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
174 " enabled=1 old-enabled=1 lsm=selinux res=1",
175 new_value, old_value,
176 from_kuid(&init_user_ns, audit_get_loginuid(current)),
177 audit_get_sessionid(current));
178 enforcing_set(state, new_value);
179 if (new_value)
180 avc_ss_reset(state->avc, 0);
181 selnl_notify_setenforce(new_value);
182 selinux_status_update_setenforce(state, new_value);
183 if (!new_value)
184 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
185 }
186 length = count;
187 out:
188 kfree(page);
189 return length;
190 }
191 #else
192 #define sel_write_enforce NULL
193 #endif
194
195 static const struct file_operations sel_enforce_ops = {
196 .read = sel_read_enforce,
197 .write = sel_write_enforce,
198 .llseek = generic_file_llseek,
199 };
200
201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
202 size_t count, loff_t *ppos)
203 {
204 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
205 struct selinux_state *state = fsi->state;
206 char tmpbuf[TMPBUFLEN];
207 ssize_t length;
208 ino_t ino = file_inode(filp)->i_ino;
209 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
210 security_get_reject_unknown(state) :
211 !security_get_allow_unknown(state);
212
213 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
214 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
215 }
216
217 static const struct file_operations sel_handle_unknown_ops = {
218 .read = sel_read_handle_unknown,
219 .llseek = generic_file_llseek,
220 };
221
222 static int sel_open_handle_status(struct inode *inode, struct file *filp)
223 {
224 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
225 struct page *status = selinux_kernel_status_page(fsi->state);
226
227 if (!status)
228 return -ENOMEM;
229
230 filp->private_data = status;
231
232 return 0;
233 }
234
235 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
236 size_t count, loff_t *ppos)
237 {
238 struct page *status = filp->private_data;
239
240 BUG_ON(!status);
241
242 return simple_read_from_buffer(buf, count, ppos,
243 page_address(status),
244 sizeof(struct selinux_kernel_status));
245 }
246
247 static int sel_mmap_handle_status(struct file *filp,
248 struct vm_area_struct *vma)
249 {
250 struct page *status = filp->private_data;
251 unsigned long size = vma->vm_end - vma->vm_start;
252
253 BUG_ON(!status);
254
255 /* only allows one page from the head */
256 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
257 return -EIO;
258 /* disallow writable mapping */
259 if (vma->vm_flags & VM_WRITE)
260 return -EPERM;
261 /* disallow mprotect() turns it into writable */
262 vma->vm_flags &= ~VM_MAYWRITE;
263
264 return remap_pfn_range(vma, vma->vm_start,
265 page_to_pfn(status),
266 size, vma->vm_page_prot);
267 }
268
269 static const struct file_operations sel_handle_status_ops = {
270 .open = sel_open_handle_status,
271 .read = sel_read_handle_status,
272 .mmap = sel_mmap_handle_status,
273 .llseek = generic_file_llseek,
274 };
275
276 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
277 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
278 size_t count, loff_t *ppos)
279
280 {
281 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
282 char *page;
283 ssize_t length;
284 int new_value;
285 int enforcing;
286
287 /* NOTE: we are now officially considering runtime disable as
288 * deprecated, and using it will become increasingly painful
289 * (e.g. sleeping/blocking) as we progress through future
290 * kernel releases until eventually it is removed
291 */
292 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
293
294 if (count >= PAGE_SIZE)
295 return -ENOMEM;
296
297 /* No partial writes. */
298 if (*ppos != 0)
299 return -EINVAL;
300
301 page = memdup_user_nul(buf, count);
302 if (IS_ERR(page))
303 return PTR_ERR(page);
304
305 length = -EINVAL;
306 if (sscanf(page, "%d", &new_value) != 1)
307 goto out;
308
309 if (new_value) {
310 enforcing = enforcing_enabled(fsi->state);
311 length = selinux_disable(fsi->state);
312 if (length)
313 goto out;
314 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
315 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
316 " enabled=0 old-enabled=1 lsm=selinux res=1",
317 enforcing, enforcing,
318 from_kuid(&init_user_ns, audit_get_loginuid(current)),
319 audit_get_sessionid(current));
320 }
321
322 length = count;
323 out:
324 kfree(page);
325 return length;
326 }
327 #else
328 #define sel_write_disable NULL
329 #endif
330
331 static const struct file_operations sel_disable_ops = {
332 .write = sel_write_disable,
333 .llseek = generic_file_llseek,
334 };
335
336 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
337 size_t count, loff_t *ppos)
338 {
339 char tmpbuf[TMPBUFLEN];
340 ssize_t length;
341
342 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
343 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
344 }
345
346 static const struct file_operations sel_policyvers_ops = {
347 .read = sel_read_policyvers,
348 .llseek = generic_file_llseek,
349 };
350
351 /* declaration for sel_write_load */
352 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
353 unsigned int *bool_num, char ***bool_pending_names,
354 unsigned int **bool_pending_values);
355 static int sel_make_classes(struct selinux_policy *newpolicy,
356 struct dentry *class_dir,
357 unsigned long *last_class_ino);
358
359 /* declaration for sel_make_class_dirs */
360 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
361 unsigned long *ino);
362
363 /* declaration for sel_make_policy_nodes */
364 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
365 unsigned long *ino);
366
367 /* declaration for sel_make_policy_nodes */
368 static void sel_remove_entries(struct dentry *de);
369
370 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
371 size_t count, loff_t *ppos)
372 {
373 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
374 char tmpbuf[TMPBUFLEN];
375 ssize_t length;
376
377 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
378 security_mls_enabled(fsi->state));
379 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
380 }
381
382 static const struct file_operations sel_mls_ops = {
383 .read = sel_read_mls,
384 .llseek = generic_file_llseek,
385 };
386
387 struct policy_load_memory {
388 size_t len;
389 void *data;
390 };
391
392 static int sel_open_policy(struct inode *inode, struct file *filp)
393 {
394 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
395 struct selinux_state *state = fsi->state;
396 struct policy_load_memory *plm = NULL;
397 int rc;
398
399 BUG_ON(filp->private_data);
400
401 mutex_lock(&fsi->state->policy_mutex);
402
403 rc = avc_has_perm(&selinux_state,
404 current_sid(), SECINITSID_SECURITY,
405 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
406 if (rc)
407 goto err;
408
409 rc = -EBUSY;
410 if (fsi->policy_opened)
411 goto err;
412
413 rc = -ENOMEM;
414 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
415 if (!plm)
416 goto err;
417
418 rc = security_read_policy(state, &plm->data, &plm->len);
419 if (rc)
420 goto err;
421
422 if ((size_t)i_size_read(inode) != plm->len) {
423 inode_lock(inode);
424 i_size_write(inode, plm->len);
425 inode_unlock(inode);
426 }
427
428 fsi->policy_opened = 1;
429
430 filp->private_data = plm;
431
432 mutex_unlock(&fsi->state->policy_mutex);
433
434 return 0;
435 err:
436 mutex_unlock(&fsi->state->policy_mutex);
437
438 if (plm)
439 vfree(plm->data);
440 kfree(plm);
441 return rc;
442 }
443
444 static int sel_release_policy(struct inode *inode, struct file *filp)
445 {
446 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
447 struct policy_load_memory *plm = filp->private_data;
448
449 BUG_ON(!plm);
450
451 fsi->policy_opened = 0;
452
453 vfree(plm->data);
454 kfree(plm);
455
456 return 0;
457 }
458
459 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
460 size_t count, loff_t *ppos)
461 {
462 struct policy_load_memory *plm = filp->private_data;
463 int ret;
464
465 ret = avc_has_perm(&selinux_state,
466 current_sid(), SECINITSID_SECURITY,
467 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
468 if (ret)
469 return ret;
470
471 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
472 }
473
474 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
475 {
476 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
477 unsigned long offset;
478 struct page *page;
479
480 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
481 return VM_FAULT_SIGBUS;
482
483 offset = vmf->pgoff << PAGE_SHIFT;
484 if (offset >= roundup(plm->len, PAGE_SIZE))
485 return VM_FAULT_SIGBUS;
486
487 page = vmalloc_to_page(plm->data + offset);
488 get_page(page);
489
490 vmf->page = page;
491
492 return 0;
493 }
494
495 static const struct vm_operations_struct sel_mmap_policy_ops = {
496 .fault = sel_mmap_policy_fault,
497 .page_mkwrite = sel_mmap_policy_fault,
498 };
499
500 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
501 {
502 if (vma->vm_flags & VM_SHARED) {
503 /* do not allow mprotect to make mapping writable */
504 vma->vm_flags &= ~VM_MAYWRITE;
505
506 if (vma->vm_flags & VM_WRITE)
507 return -EACCES;
508 }
509
510 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
511 vma->vm_ops = &sel_mmap_policy_ops;
512
513 return 0;
514 }
515
516 static const struct file_operations sel_policy_ops = {
517 .open = sel_open_policy,
518 .read = sel_read_policy,
519 .mmap = sel_mmap_policy,
520 .release = sel_release_policy,
521 .llseek = generic_file_llseek,
522 };
523
524 static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
525 unsigned int *bool_values)
526 {
527 u32 i;
528
529 /* bool_dir cleanup */
530 for (i = 0; i < bool_num; i++)
531 kfree(bool_names[i]);
532 kfree(bool_names);
533 kfree(bool_values);
534 }
535
536 static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
537 struct selinux_policy *newpolicy)
538 {
539 int ret = 0;
540 struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
541 unsigned int tmp_bool_num, old_bool_num;
542 char **tmp_bool_names, **old_bool_names;
543 unsigned int *tmp_bool_values, *old_bool_values;
544 unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
545
546 tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
547 if (IS_ERR(tmp_parent))
548 return PTR_ERR(tmp_parent);
549
550 tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
551 tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
552 if (IS_ERR(tmp_bool_dir)) {
553 ret = PTR_ERR(tmp_bool_dir);
554 goto out;
555 }
556
557 tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
558 tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
559 if (IS_ERR(tmp_class_dir)) {
560 ret = PTR_ERR(tmp_class_dir);
561 goto out;
562 }
563
564 ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
565 &tmp_bool_names, &tmp_bool_values);
566 if (ret) {
567 pr_err("SELinux: failed to load policy booleans\n");
568 goto out;
569 }
570
571 ret = sel_make_classes(newpolicy, tmp_class_dir,
572 &fsi->last_class_ino);
573 if (ret) {
574 pr_err("SELinux: failed to load policy classes\n");
575 goto out;
576 }
577
578 /* booleans */
579 old_dentry = fsi->bool_dir;
580 lock_rename(tmp_bool_dir, old_dentry);
581 d_exchange(tmp_bool_dir, fsi->bool_dir);
582
583 old_bool_num = fsi->bool_num;
584 old_bool_names = fsi->bool_pending_names;
585 old_bool_values = fsi->bool_pending_values;
586
587 fsi->bool_num = tmp_bool_num;
588 fsi->bool_pending_names = tmp_bool_names;
589 fsi->bool_pending_values = tmp_bool_values;
590
591 sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
592
593 fsi->bool_dir = tmp_bool_dir;
594 unlock_rename(tmp_bool_dir, old_dentry);
595
596 /* classes */
597 old_dentry = fsi->class_dir;
598 lock_rename(tmp_class_dir, old_dentry);
599 d_exchange(tmp_class_dir, fsi->class_dir);
600 fsi->class_dir = tmp_class_dir;
601 unlock_rename(tmp_class_dir, old_dentry);
602
603 out:
604 /* Since the other temporary dirs are children of tmp_parent
605 * this will handle all the cleanup in the case of a failure before
606 * the swapover
607 */
608 sel_remove_entries(tmp_parent);
609 dput(tmp_parent); /* d_genocide() only handles the children */
610
611 return ret;
612 }
613
614 static ssize_t sel_write_load(struct file *file, const char __user *buf,
615 size_t count, loff_t *ppos)
616
617 {
618 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
619 struct selinux_policy *newpolicy;
620 ssize_t length;
621 void *data = NULL;
622
623 mutex_lock(&fsi->state->policy_mutex);
624
625 length = avc_has_perm(&selinux_state,
626 current_sid(), SECINITSID_SECURITY,
627 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
628 if (length)
629 goto out;
630
631 /* No partial writes. */
632 length = -EINVAL;
633 if (*ppos != 0)
634 goto out;
635
636 length = -ENOMEM;
637 data = vmalloc(count);
638 if (!data)
639 goto out;
640
641 length = -EFAULT;
642 if (copy_from_user(data, buf, count) != 0)
643 goto out;
644
645 length = security_load_policy(fsi->state, data, count, &newpolicy);
646 if (length) {
647 pr_warn_ratelimited("SELinux: failed to load policy\n");
648 goto out;
649 }
650
651 length = sel_make_policy_nodes(fsi, newpolicy);
652 if (length) {
653 selinux_policy_cancel(fsi->state, newpolicy);
654 goto out1;
655 }
656
657 selinux_policy_commit(fsi->state, newpolicy);
658
659 length = count;
660
661 out1:
662 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
663 "auid=%u ses=%u lsm=selinux res=1",
664 from_kuid(&init_user_ns, audit_get_loginuid(current)),
665 audit_get_sessionid(current));
666 out:
667 mutex_unlock(&fsi->state->policy_mutex);
668 vfree(data);
669 return length;
670 }
671
672 static const struct file_operations sel_load_ops = {
673 .write = sel_write_load,
674 .llseek = generic_file_llseek,
675 };
676
677 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
678 {
679 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
680 struct selinux_state *state = fsi->state;
681 char *canon = NULL;
682 u32 sid, len;
683 ssize_t length;
684
685 length = avc_has_perm(&selinux_state,
686 current_sid(), SECINITSID_SECURITY,
687 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
688 if (length)
689 goto out;
690
691 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
692 if (length)
693 goto out;
694
695 length = security_sid_to_context(state, sid, &canon, &len);
696 if (length)
697 goto out;
698
699 length = -ERANGE;
700 if (len > SIMPLE_TRANSACTION_LIMIT) {
701 pr_err("SELinux: %s: context size (%u) exceeds "
702 "payload max\n", __func__, len);
703 goto out;
704 }
705
706 memcpy(buf, canon, len);
707 length = len;
708 out:
709 kfree(canon);
710 return length;
711 }
712
713 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
714 size_t count, loff_t *ppos)
715 {
716 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
717 char tmpbuf[TMPBUFLEN];
718 ssize_t length;
719
720 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
721 checkreqprot_get(fsi->state));
722 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
723 }
724
725 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
726 size_t count, loff_t *ppos)
727 {
728 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
729 char *page;
730 ssize_t length;
731 unsigned int new_value;
732
733 length = avc_has_perm(&selinux_state,
734 current_sid(), SECINITSID_SECURITY,
735 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
736 NULL);
737 if (length)
738 return length;
739
740 if (count >= PAGE_SIZE)
741 return -ENOMEM;
742
743 /* No partial writes. */
744 if (*ppos != 0)
745 return -EINVAL;
746
747 page = memdup_user_nul(buf, count);
748 if (IS_ERR(page))
749 return PTR_ERR(page);
750
751 length = -EINVAL;
752 if (sscanf(page, "%u", &new_value) != 1)
753 goto out;
754
755 if (new_value) {
756 char comm[sizeof(current->comm)];
757
758 memcpy(comm, current->comm, sizeof(comm));
759 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
760 comm, current->pid);
761 }
762
763 checkreqprot_set(fsi->state, (new_value ? 1 : 0));
764 length = count;
765 out:
766 kfree(page);
767 return length;
768 }
769 static const struct file_operations sel_checkreqprot_ops = {
770 .read = sel_read_checkreqprot,
771 .write = sel_write_checkreqprot,
772 .llseek = generic_file_llseek,
773 };
774
775 static ssize_t sel_write_validatetrans(struct file *file,
776 const char __user *buf,
777 size_t count, loff_t *ppos)
778 {
779 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
780 struct selinux_state *state = fsi->state;
781 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
782 char *req = NULL;
783 u32 osid, nsid, tsid;
784 u16 tclass;
785 int rc;
786
787 rc = avc_has_perm(&selinux_state,
788 current_sid(), SECINITSID_SECURITY,
789 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
790 if (rc)
791 goto out;
792
793 rc = -ENOMEM;
794 if (count >= PAGE_SIZE)
795 goto out;
796
797 /* No partial writes. */
798 rc = -EINVAL;
799 if (*ppos != 0)
800 goto out;
801
802 req = memdup_user_nul(buf, count);
803 if (IS_ERR(req)) {
804 rc = PTR_ERR(req);
805 req = NULL;
806 goto out;
807 }
808
809 rc = -ENOMEM;
810 oldcon = kzalloc(count + 1, GFP_KERNEL);
811 if (!oldcon)
812 goto out;
813
814 newcon = kzalloc(count + 1, GFP_KERNEL);
815 if (!newcon)
816 goto out;
817
818 taskcon = kzalloc(count + 1, GFP_KERNEL);
819 if (!taskcon)
820 goto out;
821
822 rc = -EINVAL;
823 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
824 goto out;
825
826 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
827 if (rc)
828 goto out;
829
830 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
831 if (rc)
832 goto out;
833
834 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
835 if (rc)
836 goto out;
837
838 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
839 if (!rc)
840 rc = count;
841 out:
842 kfree(req);
843 kfree(oldcon);
844 kfree(newcon);
845 kfree(taskcon);
846 return rc;
847 }
848
849 static const struct file_operations sel_transition_ops = {
850 .write = sel_write_validatetrans,
851 .llseek = generic_file_llseek,
852 };
853
854 /*
855 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
856 */
857 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
858 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
859 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
860 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
861 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
862
863 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
864 [SEL_ACCESS] = sel_write_access,
865 [SEL_CREATE] = sel_write_create,
866 [SEL_RELABEL] = sel_write_relabel,
867 [SEL_USER] = sel_write_user,
868 [SEL_MEMBER] = sel_write_member,
869 [SEL_CONTEXT] = sel_write_context,
870 };
871
872 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
873 {
874 ino_t ino = file_inode(file)->i_ino;
875 char *data;
876 ssize_t rv;
877
878 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
879 return -EINVAL;
880
881 data = simple_transaction_get(file, buf, size);
882 if (IS_ERR(data))
883 return PTR_ERR(data);
884
885 rv = write_op[ino](file, data, size);
886 if (rv > 0) {
887 simple_transaction_set(file, rv);
888 rv = size;
889 }
890 return rv;
891 }
892
893 static const struct file_operations transaction_ops = {
894 .write = selinux_transaction_write,
895 .read = simple_transaction_read,
896 .release = simple_transaction_release,
897 .llseek = generic_file_llseek,
898 };
899
900 /*
901 * payload - write methods
902 * If the method has a response, the response should be put in buf,
903 * and the length returned. Otherwise return 0 or and -error.
904 */
905
906 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
907 {
908 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
909 struct selinux_state *state = fsi->state;
910 char *scon = NULL, *tcon = NULL;
911 u32 ssid, tsid;
912 u16 tclass;
913 struct av_decision avd;
914 ssize_t length;
915
916 length = avc_has_perm(&selinux_state,
917 current_sid(), SECINITSID_SECURITY,
918 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
919 if (length)
920 goto out;
921
922 length = -ENOMEM;
923 scon = kzalloc(size + 1, GFP_KERNEL);
924 if (!scon)
925 goto out;
926
927 length = -ENOMEM;
928 tcon = kzalloc(size + 1, GFP_KERNEL);
929 if (!tcon)
930 goto out;
931
932 length = -EINVAL;
933 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
934 goto out;
935
936 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
937 if (length)
938 goto out;
939
940 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
941 if (length)
942 goto out;
943
944 security_compute_av_user(state, ssid, tsid, tclass, &avd);
945
946 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
947 "%x %x %x %x %u %x",
948 avd.allowed, 0xffffffff,
949 avd.auditallow, avd.auditdeny,
950 avd.seqno, avd.flags);
951 out:
952 kfree(tcon);
953 kfree(scon);
954 return length;
955 }
956
957 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
958 {
959 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
960 struct selinux_state *state = fsi->state;
961 char *scon = NULL, *tcon = NULL;
962 char *namebuf = NULL, *objname = NULL;
963 u32 ssid, tsid, newsid;
964 u16 tclass;
965 ssize_t length;
966 char *newcon = NULL;
967 u32 len;
968 int nargs;
969
970 length = avc_has_perm(&selinux_state,
971 current_sid(), SECINITSID_SECURITY,
972 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
973 NULL);
974 if (length)
975 goto out;
976
977 length = -ENOMEM;
978 scon = kzalloc(size + 1, GFP_KERNEL);
979 if (!scon)
980 goto out;
981
982 length = -ENOMEM;
983 tcon = kzalloc(size + 1, GFP_KERNEL);
984 if (!tcon)
985 goto out;
986
987 length = -ENOMEM;
988 namebuf = kzalloc(size + 1, GFP_KERNEL);
989 if (!namebuf)
990 goto out;
991
992 length = -EINVAL;
993 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
994 if (nargs < 3 || nargs > 4)
995 goto out;
996 if (nargs == 4) {
997 /*
998 * If and when the name of new object to be queried contains
999 * either whitespace or multibyte characters, they shall be
1000 * encoded based on the percentage-encoding rule.
1001 * If not encoded, the sscanf logic picks up only left-half
1002 * of the supplied name; splitted by a whitespace unexpectedly.
1003 */
1004 char *r, *w;
1005 int c1, c2;
1006
1007 r = w = namebuf;
1008 do {
1009 c1 = *r++;
1010 if (c1 == '+')
1011 c1 = ' ';
1012 else if (c1 == '%') {
1013 c1 = hex_to_bin(*r++);
1014 if (c1 < 0)
1015 goto out;
1016 c2 = hex_to_bin(*r++);
1017 if (c2 < 0)
1018 goto out;
1019 c1 = (c1 << 4) | c2;
1020 }
1021 *w++ = c1;
1022 } while (c1 != '\0');
1023
1024 objname = namebuf;
1025 }
1026
1027 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1028 if (length)
1029 goto out;
1030
1031 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1032 if (length)
1033 goto out;
1034
1035 length = security_transition_sid_user(state, ssid, tsid, tclass,
1036 objname, &newsid);
1037 if (length)
1038 goto out;
1039
1040 length = security_sid_to_context(state, newsid, &newcon, &len);
1041 if (length)
1042 goto out;
1043
1044 length = -ERANGE;
1045 if (len > SIMPLE_TRANSACTION_LIMIT) {
1046 pr_err("SELinux: %s: context size (%u) exceeds "
1047 "payload max\n", __func__, len);
1048 goto out;
1049 }
1050
1051 memcpy(buf, newcon, len);
1052 length = len;
1053 out:
1054 kfree(newcon);
1055 kfree(namebuf);
1056 kfree(tcon);
1057 kfree(scon);
1058 return length;
1059 }
1060
1061 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1062 {
1063 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1064 struct selinux_state *state = fsi->state;
1065 char *scon = NULL, *tcon = NULL;
1066 u32 ssid, tsid, newsid;
1067 u16 tclass;
1068 ssize_t length;
1069 char *newcon = NULL;
1070 u32 len;
1071
1072 length = avc_has_perm(&selinux_state,
1073 current_sid(), SECINITSID_SECURITY,
1074 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1075 NULL);
1076 if (length)
1077 goto out;
1078
1079 length = -ENOMEM;
1080 scon = kzalloc(size + 1, GFP_KERNEL);
1081 if (!scon)
1082 goto out;
1083
1084 length = -ENOMEM;
1085 tcon = kzalloc(size + 1, GFP_KERNEL);
1086 if (!tcon)
1087 goto out;
1088
1089 length = -EINVAL;
1090 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1091 goto out;
1092
1093 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1094 if (length)
1095 goto out;
1096
1097 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1098 if (length)
1099 goto out;
1100
1101 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1102 if (length)
1103 goto out;
1104
1105 length = security_sid_to_context(state, newsid, &newcon, &len);
1106 if (length)
1107 goto out;
1108
1109 length = -ERANGE;
1110 if (len > SIMPLE_TRANSACTION_LIMIT)
1111 goto out;
1112
1113 memcpy(buf, newcon, len);
1114 length = len;
1115 out:
1116 kfree(newcon);
1117 kfree(tcon);
1118 kfree(scon);
1119 return length;
1120 }
1121
1122 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1123 {
1124 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1125 struct selinux_state *state = fsi->state;
1126 char *con = NULL, *user = NULL, *ptr;
1127 u32 sid, *sids = NULL;
1128 ssize_t length;
1129 char *newcon;
1130 int i, rc;
1131 u32 len, nsids;
1132
1133 length = avc_has_perm(&selinux_state,
1134 current_sid(), SECINITSID_SECURITY,
1135 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1136 NULL);
1137 if (length)
1138 goto out;
1139
1140 length = -ENOMEM;
1141 con = kzalloc(size + 1, GFP_KERNEL);
1142 if (!con)
1143 goto out;
1144
1145 length = -ENOMEM;
1146 user = kzalloc(size + 1, GFP_KERNEL);
1147 if (!user)
1148 goto out;
1149
1150 length = -EINVAL;
1151 if (sscanf(buf, "%s %s", con, user) != 2)
1152 goto out;
1153
1154 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1155 if (length)
1156 goto out;
1157
1158 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1159 if (length)
1160 goto out;
1161
1162 length = sprintf(buf, "%u", nsids) + 1;
1163 ptr = buf + length;
1164 for (i = 0; i < nsids; i++) {
1165 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1166 if (rc) {
1167 length = rc;
1168 goto out;
1169 }
1170 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1171 kfree(newcon);
1172 length = -ERANGE;
1173 goto out;
1174 }
1175 memcpy(ptr, newcon, len);
1176 kfree(newcon);
1177 ptr += len;
1178 length += len;
1179 }
1180 out:
1181 kfree(sids);
1182 kfree(user);
1183 kfree(con);
1184 return length;
1185 }
1186
1187 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1188 {
1189 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1190 struct selinux_state *state = fsi->state;
1191 char *scon = NULL, *tcon = NULL;
1192 u32 ssid, tsid, newsid;
1193 u16 tclass;
1194 ssize_t length;
1195 char *newcon = NULL;
1196 u32 len;
1197
1198 length = avc_has_perm(&selinux_state,
1199 current_sid(), SECINITSID_SECURITY,
1200 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1201 NULL);
1202 if (length)
1203 goto out;
1204
1205 length = -ENOMEM;
1206 scon = kzalloc(size + 1, GFP_KERNEL);
1207 if (!scon)
1208 goto out;
1209
1210 length = -ENOMEM;
1211 tcon = kzalloc(size + 1, GFP_KERNEL);
1212 if (!tcon)
1213 goto out;
1214
1215 length = -EINVAL;
1216 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1217 goto out;
1218
1219 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1220 if (length)
1221 goto out;
1222
1223 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1224 if (length)
1225 goto out;
1226
1227 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1228 if (length)
1229 goto out;
1230
1231 length = security_sid_to_context(state, newsid, &newcon, &len);
1232 if (length)
1233 goto out;
1234
1235 length = -ERANGE;
1236 if (len > SIMPLE_TRANSACTION_LIMIT) {
1237 pr_err("SELinux: %s: context size (%u) exceeds "
1238 "payload max\n", __func__, len);
1239 goto out;
1240 }
1241
1242 memcpy(buf, newcon, len);
1243 length = len;
1244 out:
1245 kfree(newcon);
1246 kfree(tcon);
1247 kfree(scon);
1248 return length;
1249 }
1250
1251 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1252 {
1253 struct inode *ret = new_inode(sb);
1254
1255 if (ret) {
1256 ret->i_mode = mode;
1257 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1258 }
1259 return ret;
1260 }
1261
1262 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1263 size_t count, loff_t *ppos)
1264 {
1265 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1266 char *page = NULL;
1267 ssize_t length;
1268 ssize_t ret;
1269 int cur_enforcing;
1270 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1271 const char *name = filep->f_path.dentry->d_name.name;
1272
1273 mutex_lock(&fsi->state->policy_mutex);
1274
1275 ret = -EINVAL;
1276 if (index >= fsi->bool_num || strcmp(name,
1277 fsi->bool_pending_names[index]))
1278 goto out_unlock;
1279
1280 ret = -ENOMEM;
1281 page = (char *)get_zeroed_page(GFP_KERNEL);
1282 if (!page)
1283 goto out_unlock;
1284
1285 cur_enforcing = security_get_bool_value(fsi->state, index);
1286 if (cur_enforcing < 0) {
1287 ret = cur_enforcing;
1288 goto out_unlock;
1289 }
1290 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1291 fsi->bool_pending_values[index]);
1292 mutex_unlock(&fsi->state->policy_mutex);
1293 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1294 out_free:
1295 free_page((unsigned long)page);
1296 return ret;
1297
1298 out_unlock:
1299 mutex_unlock(&fsi->state->policy_mutex);
1300 goto out_free;
1301 }
1302
1303 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1304 size_t count, loff_t *ppos)
1305 {
1306 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1307 char *page = NULL;
1308 ssize_t length;
1309 int new_value;
1310 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1311 const char *name = filep->f_path.dentry->d_name.name;
1312
1313 if (count >= PAGE_SIZE)
1314 return -ENOMEM;
1315
1316 /* No partial writes. */
1317 if (*ppos != 0)
1318 return -EINVAL;
1319
1320 page = memdup_user_nul(buf, count);
1321 if (IS_ERR(page))
1322 return PTR_ERR(page);
1323
1324 mutex_lock(&fsi->state->policy_mutex);
1325
1326 length = avc_has_perm(&selinux_state,
1327 current_sid(), SECINITSID_SECURITY,
1328 SECCLASS_SECURITY, SECURITY__SETBOOL,
1329 NULL);
1330 if (length)
1331 goto out;
1332
1333 length = -EINVAL;
1334 if (index >= fsi->bool_num || strcmp(name,
1335 fsi->bool_pending_names[index]))
1336 goto out;
1337
1338 length = -EINVAL;
1339 if (sscanf(page, "%d", &new_value) != 1)
1340 goto out;
1341
1342 if (new_value)
1343 new_value = 1;
1344
1345 fsi->bool_pending_values[index] = new_value;
1346 length = count;
1347
1348 out:
1349 mutex_unlock(&fsi->state->policy_mutex);
1350 kfree(page);
1351 return length;
1352 }
1353
1354 static const struct file_operations sel_bool_ops = {
1355 .read = sel_read_bool,
1356 .write = sel_write_bool,
1357 .llseek = generic_file_llseek,
1358 };
1359
1360 static ssize_t sel_commit_bools_write(struct file *filep,
1361 const char __user *buf,
1362 size_t count, loff_t *ppos)
1363 {
1364 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1365 char *page = NULL;
1366 ssize_t length;
1367 int new_value;
1368
1369 if (count >= PAGE_SIZE)
1370 return -ENOMEM;
1371
1372 /* No partial writes. */
1373 if (*ppos != 0)
1374 return -EINVAL;
1375
1376 page = memdup_user_nul(buf, count);
1377 if (IS_ERR(page))
1378 return PTR_ERR(page);
1379
1380 mutex_lock(&fsi->state->policy_mutex);
1381
1382 length = avc_has_perm(&selinux_state,
1383 current_sid(), SECINITSID_SECURITY,
1384 SECCLASS_SECURITY, SECURITY__SETBOOL,
1385 NULL);
1386 if (length)
1387 goto out;
1388
1389 length = -EINVAL;
1390 if (sscanf(page, "%d", &new_value) != 1)
1391 goto out;
1392
1393 length = 0;
1394 if (new_value && fsi->bool_pending_values)
1395 length = security_set_bools(fsi->state, fsi->bool_num,
1396 fsi->bool_pending_values);
1397
1398 if (!length)
1399 length = count;
1400
1401 out:
1402 mutex_unlock(&fsi->state->policy_mutex);
1403 kfree(page);
1404 return length;
1405 }
1406
1407 static const struct file_operations sel_commit_bools_ops = {
1408 .write = sel_commit_bools_write,
1409 .llseek = generic_file_llseek,
1410 };
1411
1412 static void sel_remove_entries(struct dentry *de)
1413 {
1414 d_genocide(de);
1415 shrink_dcache_parent(de);
1416 }
1417
1418 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1419 unsigned int *bool_num, char ***bool_pending_names,
1420 unsigned int **bool_pending_values)
1421 {
1422 int ret;
1423 ssize_t len;
1424 struct dentry *dentry = NULL;
1425 struct inode *inode = NULL;
1426 struct inode_security_struct *isec;
1427 char **names = NULL, *page;
1428 u32 i, num;
1429 int *values = NULL;
1430 u32 sid;
1431
1432 ret = -ENOMEM;
1433 page = (char *)get_zeroed_page(GFP_KERNEL);
1434 if (!page)
1435 goto out;
1436
1437 ret = security_get_bools(newpolicy, &num, &names, &values);
1438 if (ret)
1439 goto out;
1440
1441 for (i = 0; i < num; i++) {
1442 ret = -ENOMEM;
1443 dentry = d_alloc_name(bool_dir, names[i]);
1444 if (!dentry)
1445 goto out;
1446
1447 ret = -ENOMEM;
1448 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1449 if (!inode) {
1450 dput(dentry);
1451 goto out;
1452 }
1453
1454 ret = -ENAMETOOLONG;
1455 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1456 if (len >= PAGE_SIZE) {
1457 dput(dentry);
1458 iput(inode);
1459 goto out;
1460 }
1461
1462 isec = selinux_inode(inode);
1463 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1464 SECCLASS_FILE, &sid);
1465 if (ret) {
1466 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1467 page);
1468 sid = SECINITSID_SECURITY;
1469 }
1470
1471 isec->sid = sid;
1472 isec->initialized = LABEL_INITIALIZED;
1473 inode->i_fop = &sel_bool_ops;
1474 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1475 d_add(dentry, inode);
1476 }
1477 *bool_num = num;
1478 *bool_pending_names = names;
1479 *bool_pending_values = values;
1480
1481 free_page((unsigned long)page);
1482 return 0;
1483 out:
1484 free_page((unsigned long)page);
1485
1486 if (names) {
1487 for (i = 0; i < num; i++)
1488 kfree(names[i]);
1489 kfree(names);
1490 }
1491 kfree(values);
1492 sel_remove_entries(bool_dir);
1493
1494 return ret;
1495 }
1496
1497 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1498 size_t count, loff_t *ppos)
1499 {
1500 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1501 struct selinux_state *state = fsi->state;
1502 char tmpbuf[TMPBUFLEN];
1503 ssize_t length;
1504
1505 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1506 avc_get_cache_threshold(state->avc));
1507 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1508 }
1509
1510 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1511 const char __user *buf,
1512 size_t count, loff_t *ppos)
1513
1514 {
1515 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1516 struct selinux_state *state = fsi->state;
1517 char *page;
1518 ssize_t ret;
1519 unsigned int new_value;
1520
1521 ret = avc_has_perm(&selinux_state,
1522 current_sid(), SECINITSID_SECURITY,
1523 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1524 NULL);
1525 if (ret)
1526 return ret;
1527
1528 if (count >= PAGE_SIZE)
1529 return -ENOMEM;
1530
1531 /* No partial writes. */
1532 if (*ppos != 0)
1533 return -EINVAL;
1534
1535 page = memdup_user_nul(buf, count);
1536 if (IS_ERR(page))
1537 return PTR_ERR(page);
1538
1539 ret = -EINVAL;
1540 if (sscanf(page, "%u", &new_value) != 1)
1541 goto out;
1542
1543 avc_set_cache_threshold(state->avc, new_value);
1544
1545 ret = count;
1546 out:
1547 kfree(page);
1548 return ret;
1549 }
1550
1551 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1552 size_t count, loff_t *ppos)
1553 {
1554 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1555 struct selinux_state *state = fsi->state;
1556 char *page;
1557 ssize_t length;
1558
1559 page = (char *)__get_free_page(GFP_KERNEL);
1560 if (!page)
1561 return -ENOMEM;
1562
1563 length = avc_get_hash_stats(state->avc, page);
1564 if (length >= 0)
1565 length = simple_read_from_buffer(buf, count, ppos, page, length);
1566 free_page((unsigned long)page);
1567
1568 return length;
1569 }
1570
1571 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1572 size_t count, loff_t *ppos)
1573 {
1574 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1575 struct selinux_state *state = fsi->state;
1576 char *page;
1577 ssize_t length;
1578
1579 page = (char *)__get_free_page(GFP_KERNEL);
1580 if (!page)
1581 return -ENOMEM;
1582
1583 length = security_sidtab_hash_stats(state, page);
1584 if (length >= 0)
1585 length = simple_read_from_buffer(buf, count, ppos, page,
1586 length);
1587 free_page((unsigned long)page);
1588
1589 return length;
1590 }
1591
1592 static const struct file_operations sel_sidtab_hash_stats_ops = {
1593 .read = sel_read_sidtab_hash_stats,
1594 .llseek = generic_file_llseek,
1595 };
1596
1597 static const struct file_operations sel_avc_cache_threshold_ops = {
1598 .read = sel_read_avc_cache_threshold,
1599 .write = sel_write_avc_cache_threshold,
1600 .llseek = generic_file_llseek,
1601 };
1602
1603 static const struct file_operations sel_avc_hash_stats_ops = {
1604 .read = sel_read_avc_hash_stats,
1605 .llseek = generic_file_llseek,
1606 };
1607
1608 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1609 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1610 {
1611 int cpu;
1612
1613 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1614 if (!cpu_possible(cpu))
1615 continue;
1616 *idx = cpu + 1;
1617 return &per_cpu(avc_cache_stats, cpu);
1618 }
1619 (*idx)++;
1620 return NULL;
1621 }
1622
1623 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1624 {
1625 loff_t n = *pos - 1;
1626
1627 if (*pos == 0)
1628 return SEQ_START_TOKEN;
1629
1630 return sel_avc_get_stat_idx(&n);
1631 }
1632
1633 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1634 {
1635 return sel_avc_get_stat_idx(pos);
1636 }
1637
1638 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1639 {
1640 struct avc_cache_stats *st = v;
1641
1642 if (v == SEQ_START_TOKEN) {
1643 seq_puts(seq,
1644 "lookups hits misses allocations reclaims frees\n");
1645 } else {
1646 unsigned int lookups = st->lookups;
1647 unsigned int misses = st->misses;
1648 unsigned int hits = lookups - misses;
1649 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1650 hits, misses, st->allocations,
1651 st->reclaims, st->frees);
1652 }
1653 return 0;
1654 }
1655
1656 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1657 { }
1658
1659 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1660 .start = sel_avc_stats_seq_start,
1661 .next = sel_avc_stats_seq_next,
1662 .show = sel_avc_stats_seq_show,
1663 .stop = sel_avc_stats_seq_stop,
1664 };
1665
1666 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1667 {
1668 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1669 }
1670
1671 static const struct file_operations sel_avc_cache_stats_ops = {
1672 .open = sel_open_avc_cache_stats,
1673 .read = seq_read,
1674 .llseek = seq_lseek,
1675 .release = seq_release,
1676 };
1677 #endif
1678
1679 static int sel_make_avc_files(struct dentry *dir)
1680 {
1681 struct super_block *sb = dir->d_sb;
1682 struct selinux_fs_info *fsi = sb->s_fs_info;
1683 int i;
1684 static const struct tree_descr files[] = {
1685 { "cache_threshold",
1686 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1687 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1688 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1689 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1690 #endif
1691 };
1692
1693 for (i = 0; i < ARRAY_SIZE(files); i++) {
1694 struct inode *inode;
1695 struct dentry *dentry;
1696
1697 dentry = d_alloc_name(dir, files[i].name);
1698 if (!dentry)
1699 return -ENOMEM;
1700
1701 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1702 if (!inode) {
1703 dput(dentry);
1704 return -ENOMEM;
1705 }
1706
1707 inode->i_fop = files[i].ops;
1708 inode->i_ino = ++fsi->last_ino;
1709 d_add(dentry, inode);
1710 }
1711
1712 return 0;
1713 }
1714
1715 static int sel_make_ss_files(struct dentry *dir)
1716 {
1717 struct super_block *sb = dir->d_sb;
1718 struct selinux_fs_info *fsi = sb->s_fs_info;
1719 int i;
1720 static struct tree_descr files[] = {
1721 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1722 };
1723
1724 for (i = 0; i < ARRAY_SIZE(files); i++) {
1725 struct inode *inode;
1726 struct dentry *dentry;
1727
1728 dentry = d_alloc_name(dir, files[i].name);
1729 if (!dentry)
1730 return -ENOMEM;
1731
1732 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1733 if (!inode) {
1734 dput(dentry);
1735 return -ENOMEM;
1736 }
1737
1738 inode->i_fop = files[i].ops;
1739 inode->i_ino = ++fsi->last_ino;
1740 d_add(dentry, inode);
1741 }
1742
1743 return 0;
1744 }
1745
1746 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1747 size_t count, loff_t *ppos)
1748 {
1749 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1750 char *con;
1751 u32 sid, len;
1752 ssize_t ret;
1753
1754 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1755 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1756 if (ret)
1757 return ret;
1758
1759 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1760 kfree(con);
1761 return ret;
1762 }
1763
1764 static const struct file_operations sel_initcon_ops = {
1765 .read = sel_read_initcon,
1766 .llseek = generic_file_llseek,
1767 };
1768
1769 static int sel_make_initcon_files(struct dentry *dir)
1770 {
1771 int i;
1772
1773 for (i = 1; i <= SECINITSID_NUM; i++) {
1774 struct inode *inode;
1775 struct dentry *dentry;
1776 const char *s = security_get_initial_sid_context(i);
1777
1778 if (!s)
1779 continue;
1780 dentry = d_alloc_name(dir, s);
1781 if (!dentry)
1782 return -ENOMEM;
1783
1784 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1785 if (!inode) {
1786 dput(dentry);
1787 return -ENOMEM;
1788 }
1789
1790 inode->i_fop = &sel_initcon_ops;
1791 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1792 d_add(dentry, inode);
1793 }
1794
1795 return 0;
1796 }
1797
1798 static inline unsigned long sel_class_to_ino(u16 class)
1799 {
1800 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1801 }
1802
1803 static inline u16 sel_ino_to_class(unsigned long ino)
1804 {
1805 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1806 }
1807
1808 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1809 {
1810 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1811 }
1812
1813 static inline u32 sel_ino_to_perm(unsigned long ino)
1814 {
1815 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1816 }
1817
1818 static ssize_t sel_read_class(struct file *file, char __user *buf,
1819 size_t count, loff_t *ppos)
1820 {
1821 unsigned long ino = file_inode(file)->i_ino;
1822 char res[TMPBUFLEN];
1823 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1824 return simple_read_from_buffer(buf, count, ppos, res, len);
1825 }
1826
1827 static const struct file_operations sel_class_ops = {
1828 .read = sel_read_class,
1829 .llseek = generic_file_llseek,
1830 };
1831
1832 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1833 size_t count, loff_t *ppos)
1834 {
1835 unsigned long ino = file_inode(file)->i_ino;
1836 char res[TMPBUFLEN];
1837 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1838 return simple_read_from_buffer(buf, count, ppos, res, len);
1839 }
1840
1841 static const struct file_operations sel_perm_ops = {
1842 .read = sel_read_perm,
1843 .llseek = generic_file_llseek,
1844 };
1845
1846 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1847 size_t count, loff_t *ppos)
1848 {
1849 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1850 int value;
1851 char tmpbuf[TMPBUFLEN];
1852 ssize_t length;
1853 unsigned long i_ino = file_inode(file)->i_ino;
1854
1855 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1856 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1857
1858 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1859 }
1860
1861 static const struct file_operations sel_policycap_ops = {
1862 .read = sel_read_policycap,
1863 .llseek = generic_file_llseek,
1864 };
1865
1866 static int sel_make_perm_files(struct selinux_policy *newpolicy,
1867 char *objclass, int classvalue,
1868 struct dentry *dir)
1869 {
1870 int i, rc, nperms;
1871 char **perms;
1872
1873 rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1874 if (rc)
1875 return rc;
1876
1877 for (i = 0; i < nperms; i++) {
1878 struct inode *inode;
1879 struct dentry *dentry;
1880
1881 rc = -ENOMEM;
1882 dentry = d_alloc_name(dir, perms[i]);
1883 if (!dentry)
1884 goto out;
1885
1886 rc = -ENOMEM;
1887 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1888 if (!inode) {
1889 dput(dentry);
1890 goto out;
1891 }
1892
1893 inode->i_fop = &sel_perm_ops;
1894 /* i+1 since perm values are 1-indexed */
1895 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1896 d_add(dentry, inode);
1897 }
1898 rc = 0;
1899 out:
1900 for (i = 0; i < nperms; i++)
1901 kfree(perms[i]);
1902 kfree(perms);
1903 return rc;
1904 }
1905
1906 static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1907 char *classname, int index,
1908 struct dentry *dir)
1909 {
1910 struct super_block *sb = dir->d_sb;
1911 struct selinux_fs_info *fsi = sb->s_fs_info;
1912 struct dentry *dentry = NULL;
1913 struct inode *inode = NULL;
1914 int rc;
1915
1916 dentry = d_alloc_name(dir, "index");
1917 if (!dentry)
1918 return -ENOMEM;
1919
1920 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1921 if (!inode) {
1922 dput(dentry);
1923 return -ENOMEM;
1924 }
1925
1926 inode->i_fop = &sel_class_ops;
1927 inode->i_ino = sel_class_to_ino(index);
1928 d_add(dentry, inode);
1929
1930 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1931 if (IS_ERR(dentry))
1932 return PTR_ERR(dentry);
1933
1934 rc = sel_make_perm_files(newpolicy, classname, index, dentry);
1935
1936 return rc;
1937 }
1938
1939 static int sel_make_classes(struct selinux_policy *newpolicy,
1940 struct dentry *class_dir,
1941 unsigned long *last_class_ino)
1942 {
1943
1944 int rc, nclasses, i;
1945 char **classes;
1946
1947 rc = security_get_classes(newpolicy, &classes, &nclasses);
1948 if (rc)
1949 return rc;
1950
1951 /* +2 since classes are 1-indexed */
1952 *last_class_ino = sel_class_to_ino(nclasses + 2);
1953
1954 for (i = 0; i < nclasses; i++) {
1955 struct dentry *class_name_dir;
1956
1957 class_name_dir = sel_make_dir(class_dir, classes[i],
1958 last_class_ino);
1959 if (IS_ERR(class_name_dir)) {
1960 rc = PTR_ERR(class_name_dir);
1961 goto out;
1962 }
1963
1964 /* i+1 since class values are 1-indexed */
1965 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1966 class_name_dir);
1967 if (rc)
1968 goto out;
1969 }
1970 rc = 0;
1971 out:
1972 for (i = 0; i < nclasses; i++)
1973 kfree(classes[i]);
1974 kfree(classes);
1975 return rc;
1976 }
1977
1978 static int sel_make_policycap(struct selinux_fs_info *fsi)
1979 {
1980 unsigned int iter;
1981 struct dentry *dentry = NULL;
1982 struct inode *inode = NULL;
1983
1984 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1985 if (iter < ARRAY_SIZE(selinux_policycap_names))
1986 dentry = d_alloc_name(fsi->policycap_dir,
1987 selinux_policycap_names[iter]);
1988 else
1989 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1990
1991 if (dentry == NULL)
1992 return -ENOMEM;
1993
1994 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1995 if (inode == NULL) {
1996 dput(dentry);
1997 return -ENOMEM;
1998 }
1999
2000 inode->i_fop = &sel_policycap_ops;
2001 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
2002 d_add(dentry, inode);
2003 }
2004
2005 return 0;
2006 }
2007
2008 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2009 unsigned long *ino)
2010 {
2011 struct dentry *dentry = d_alloc_name(dir, name);
2012 struct inode *inode;
2013
2014 if (!dentry)
2015 return ERR_PTR(-ENOMEM);
2016
2017 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2018 if (!inode) {
2019 dput(dentry);
2020 return ERR_PTR(-ENOMEM);
2021 }
2022
2023 inode->i_op = &simple_dir_inode_operations;
2024 inode->i_fop = &simple_dir_operations;
2025 inode->i_ino = ++(*ino);
2026 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2027 inc_nlink(inode);
2028 d_add(dentry, inode);
2029 /* bump link count on parent directory, too */
2030 inc_nlink(d_inode(dir));
2031
2032 return dentry;
2033 }
2034
2035 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2036 unsigned long *ino)
2037 {
2038 struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2039
2040 if (!inode)
2041 return ERR_PTR(-ENOMEM);
2042
2043 inode->i_op = &simple_dir_inode_operations;
2044 inode->i_fop = &simple_dir_operations;
2045 inode->i_ino = ++(*ino);
2046 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2047 inc_nlink(inode);
2048 return d_obtain_alias(inode);
2049 }
2050
2051 #define NULL_FILE_NAME "null"
2052
2053 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2054 {
2055 struct selinux_fs_info *fsi;
2056 int ret;
2057 struct dentry *dentry;
2058 struct inode *inode;
2059 struct inode_security_struct *isec;
2060
2061 static const struct tree_descr selinux_files[] = {
2062 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2063 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2064 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2065 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2066 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2067 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2068 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2069 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2070 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2071 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2072 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2073 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2074 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2075 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2076 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2077 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2078 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2079 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2080 S_IWUGO},
2081 /* last one */ {""}
2082 };
2083
2084 ret = selinux_fs_info_create(sb);
2085 if (ret)
2086 goto err;
2087
2088 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2089 if (ret)
2090 goto err;
2091
2092 fsi = sb->s_fs_info;
2093 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2094 if (IS_ERR(fsi->bool_dir)) {
2095 ret = PTR_ERR(fsi->bool_dir);
2096 fsi->bool_dir = NULL;
2097 goto err;
2098 }
2099
2100 ret = -ENOMEM;
2101 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2102 if (!dentry)
2103 goto err;
2104
2105 ret = -ENOMEM;
2106 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2107 if (!inode) {
2108 dput(dentry);
2109 goto err;
2110 }
2111
2112 inode->i_ino = ++fsi->last_ino;
2113 isec = selinux_inode(inode);
2114 isec->sid = SECINITSID_DEVNULL;
2115 isec->sclass = SECCLASS_CHR_FILE;
2116 isec->initialized = LABEL_INITIALIZED;
2117
2118 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2119 d_add(dentry, inode);
2120
2121 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2122 if (IS_ERR(dentry)) {
2123 ret = PTR_ERR(dentry);
2124 goto err;
2125 }
2126
2127 ret = sel_make_avc_files(dentry);
2128
2129 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2130 if (IS_ERR(dentry)) {
2131 ret = PTR_ERR(dentry);
2132 goto err;
2133 }
2134
2135 ret = sel_make_ss_files(dentry);
2136 if (ret)
2137 goto err;
2138
2139 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2140 if (IS_ERR(dentry)) {
2141 ret = PTR_ERR(dentry);
2142 goto err;
2143 }
2144
2145 ret = sel_make_initcon_files(dentry);
2146 if (ret)
2147 goto err;
2148
2149 fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2150 if (IS_ERR(fsi->class_dir)) {
2151 ret = PTR_ERR(fsi->class_dir);
2152 fsi->class_dir = NULL;
2153 goto err;
2154 }
2155
2156 fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2157 &fsi->last_ino);
2158 if (IS_ERR(fsi->policycap_dir)) {
2159 ret = PTR_ERR(fsi->policycap_dir);
2160 fsi->policycap_dir = NULL;
2161 goto err;
2162 }
2163
2164 ret = sel_make_policycap(fsi);
2165 if (ret) {
2166 pr_err("SELinux: failed to load policy capabilities\n");
2167 goto err;
2168 }
2169
2170 return 0;
2171 err:
2172 pr_err("SELinux: %s: failed while creating inodes\n",
2173 __func__);
2174
2175 selinux_fs_info_free(sb);
2176
2177 return ret;
2178 }
2179
2180 static int sel_get_tree(struct fs_context *fc)
2181 {
2182 return get_tree_single(fc, sel_fill_super);
2183 }
2184
2185 static const struct fs_context_operations sel_context_ops = {
2186 .get_tree = sel_get_tree,
2187 };
2188
2189 static int sel_init_fs_context(struct fs_context *fc)
2190 {
2191 fc->ops = &sel_context_ops;
2192 return 0;
2193 }
2194
2195 static void sel_kill_sb(struct super_block *sb)
2196 {
2197 selinux_fs_info_free(sb);
2198 kill_litter_super(sb);
2199 }
2200
2201 static struct file_system_type sel_fs_type = {
2202 .name = "selinuxfs",
2203 .init_fs_context = sel_init_fs_context,
2204 .kill_sb = sel_kill_sb,
2205 };
2206
2207 struct vfsmount *selinuxfs_mount;
2208 struct path selinux_null;
2209
2210 static int __init init_sel_fs(void)
2211 {
2212 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2213 sizeof(NULL_FILE_NAME)-1);
2214 int err;
2215
2216 if (!selinux_enabled_boot)
2217 return 0;
2218
2219 err = sysfs_create_mount_point(fs_kobj, "selinux");
2220 if (err)
2221 return err;
2222
2223 err = register_filesystem(&sel_fs_type);
2224 if (err) {
2225 sysfs_remove_mount_point(fs_kobj, "selinux");
2226 return err;
2227 }
2228
2229 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2230 if (IS_ERR(selinuxfs_mount)) {
2231 pr_err("selinuxfs: could not mount!\n");
2232 err = PTR_ERR(selinuxfs_mount);
2233 selinuxfs_mount = NULL;
2234 }
2235 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2236 &null_name);
2237 if (IS_ERR(selinux_null.dentry)) {
2238 pr_err("selinuxfs: could not lookup null!\n");
2239 err = PTR_ERR(selinux_null.dentry);
2240 selinux_null.dentry = NULL;
2241 }
2242
2243 return err;
2244 }
2245
2246 __initcall(init_sel_fs);
2247
2248 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2249 void exit_sel_fs(void)
2250 {
2251 sysfs_remove_mount_point(fs_kobj, "selinux");
2252 dput(selinux_null.dentry);
2253 kern_unmount(selinuxfs_mount);
2254 unregister_filesystem(&sel_fs_type);
2255 }
2256 #endif
Linux with added FPC-III support