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