973f5a4a6fcecca9ed559cd37cabd2a8e611bd0a
[linux-2.6.git] / security / selinux / selinuxfs.c
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2  *
3  *      Added conditional policy language extensions
4  *
5  *  Updated: Hewlett-Packard <paul.moore@hp.com>
6  *
7  *      Added support for the policy capability bitmap
8  *
9  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12  *      This program is free software; you can redistribute it and/or modify
13  *      it under the terms of the GNU General Public License as published by
14  *      the Free Software Foundation, version 2.
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33    Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44         "network_peer_controls",
45         "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 static int __init checkreqprot_setup(char *str)
51 {
52         unsigned long checkreqprot;
53         if (!strict_strtoul(str, 0, &checkreqprot))
54                 selinux_checkreqprot = checkreqprot ? 1 : 0;
55         return 1;
56 }
57 __setup("checkreqprot=", checkreqprot_setup);
58
59 static DEFINE_MUTEX(sel_mutex);
60
61 /* global data for booleans */
62 static struct dentry *bool_dir;
63 static int bool_num;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
66
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
70
71 static char policy_opened;
72
73 /* global data for policy capabilities */
74 static struct dentry *policycap_dir;
75
76 extern void selnl_notify_setenforce(int val);
77
78 /* Check whether a task is allowed to use a security operation. */
79 static int task_has_security(struct task_struct *tsk,
80                              u32 perms)
81 {
82         const struct task_security_struct *tsec;
83         u32 sid = 0;
84
85         rcu_read_lock();
86         tsec = __task_cred(tsk)->security;
87         if (tsec)
88                 sid = tsec->sid;
89         rcu_read_unlock();
90         if (!tsec)
91                 return -EACCES;
92
93         return avc_has_perm(sid, SECINITSID_SECURITY,
94                             SECCLASS_SECURITY, perms, NULL);
95 }
96
97 enum sel_inos {
98         SEL_ROOT_INO = 2,
99         SEL_LOAD,       /* load policy */
100         SEL_ENFORCE,    /* get or set enforcing status */
101         SEL_CONTEXT,    /* validate context */
102         SEL_ACCESS,     /* compute access decision */
103         SEL_CREATE,     /* compute create labeling decision */
104         SEL_RELABEL,    /* compute relabeling decision */
105         SEL_USER,       /* compute reachable user contexts */
106         SEL_POLICYVERS, /* return policy version for this kernel */
107         SEL_COMMIT_BOOLS, /* commit new boolean values */
108         SEL_MLS,        /* return if MLS policy is enabled */
109         SEL_DISABLE,    /* disable SELinux until next reboot */
110         SEL_MEMBER,     /* compute polyinstantiation membership decision */
111         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
113         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
115         SEL_STATUS,     /* export current status using mmap() */
116         SEL_POLICY,     /* allow userspace to read the in kernel policy */
117         SEL_INO_NEXT,   /* The next inode number to use */
118 };
119
120 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
121
122 #define SEL_INITCON_INO_OFFSET          0x01000000
123 #define SEL_BOOL_INO_OFFSET             0x02000000
124 #define SEL_CLASS_INO_OFFSET            0x04000000
125 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
126 #define SEL_INO_MASK                    0x00ffffff
127
128 #define TMPBUFLEN       12
129 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130                                 size_t count, loff_t *ppos)
131 {
132         char tmpbuf[TMPBUFLEN];
133         ssize_t length;
134
135         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
137 }
138
139 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
141                                  size_t count, loff_t *ppos)
142
143 {
144         char *page = NULL;
145         ssize_t length;
146         int new_value;
147
148         length = -ENOMEM;
149         if (count >= PAGE_SIZE)
150                 goto out;
151
152         /* No partial writes. */
153         length = EINVAL;
154         if (*ppos != 0)
155                 goto out;
156
157         length = -ENOMEM;
158         page = (char *)get_zeroed_page(GFP_KERNEL);
159         if (!page)
160                 goto out;
161
162         length = -EFAULT;
163         if (copy_from_user(page, buf, count))
164                 goto out;
165
166         length = -EINVAL;
167         if (sscanf(page, "%d", &new_value) != 1)
168                 goto out;
169
170         if (new_value != selinux_enforcing) {
171                 length = task_has_security(current, SECURITY__SETENFORCE);
172                 if (length)
173                         goto out;
174                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176                         new_value, selinux_enforcing,
177                         audit_get_loginuid(current),
178                         audit_get_sessionid(current));
179                 selinux_enforcing = new_value;
180                 if (selinux_enforcing)
181                         avc_ss_reset(0);
182                 selnl_notify_setenforce(selinux_enforcing);
183                 selinux_status_update_setenforce(selinux_enforcing);
184         }
185         length = count;
186 out:
187         free_page((unsigned long) page);
188         return length;
189 }
190 #else
191 #define sel_write_enforce NULL
192 #endif
193
194 static const struct file_operations sel_enforce_ops = {
195         .read           = sel_read_enforce,
196         .write          = sel_write_enforce,
197         .llseek         = generic_file_llseek,
198 };
199
200 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201                                         size_t count, loff_t *ppos)
202 {
203         char tmpbuf[TMPBUFLEN];
204         ssize_t length;
205         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
206         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207                 security_get_reject_unknown() : !security_get_allow_unknown();
208
209         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211 }
212
213 static const struct file_operations sel_handle_unknown_ops = {
214         .read           = sel_read_handle_unknown,
215         .llseek         = generic_file_llseek,
216 };
217
218 static int sel_open_handle_status(struct inode *inode, struct file *filp)
219 {
220         struct page    *status = selinux_kernel_status_page();
221
222         if (!status)
223                 return -ENOMEM;
224
225         filp->private_data = status;
226
227         return 0;
228 }
229
230 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231                                       size_t count, loff_t *ppos)
232 {
233         struct page    *status = filp->private_data;
234
235         BUG_ON(!status);
236
237         return simple_read_from_buffer(buf, count, ppos,
238                                        page_address(status),
239                                        sizeof(struct selinux_kernel_status));
240 }
241
242 static int sel_mmap_handle_status(struct file *filp,
243                                   struct vm_area_struct *vma)
244 {
245         struct page    *status = filp->private_data;
246         unsigned long   size = vma->vm_end - vma->vm_start;
247
248         BUG_ON(!status);
249
250         /* only allows one page from the head */
251         if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
252                 return -EIO;
253         /* disallow writable mapping */
254         if (vma->vm_flags & VM_WRITE)
255                 return -EPERM;
256         /* disallow mprotect() turns it into writable */
257         vma->vm_flags &= ~VM_MAYWRITE;
258
259         return remap_pfn_range(vma, vma->vm_start,
260                                page_to_pfn(status),
261                                size, vma->vm_page_prot);
262 }
263
264 static const struct file_operations sel_handle_status_ops = {
265         .open           = sel_open_handle_status,
266         .read           = sel_read_handle_status,
267         .mmap           = sel_mmap_handle_status,
268         .llseek         = generic_file_llseek,
269 };
270
271 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
272 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
273                                  size_t count, loff_t *ppos)
274
275 {
276         char *page = NULL;
277         ssize_t length;
278         int new_value;
279         extern int selinux_disable(void);
280
281         length = -ENOMEM;
282         if (count >= PAGE_SIZE)
283                 goto out;;
284
285         /* No partial writes. */
286         length = -EINVAL;
287         if (*ppos != 0)
288                 goto out;
289
290         length = -ENOMEM;
291         page = (char *)get_zeroed_page(GFP_KERNEL);
292         if (!page)
293                 goto out;
294
295         length = -EFAULT;
296         if (copy_from_user(page, buf, count))
297                 goto out;
298
299         length = -EINVAL;
300         if (sscanf(page, "%d", &new_value) != 1)
301                 goto out;
302
303         if (new_value) {
304                 length = selinux_disable();
305                 if (length)
306                         goto out;
307                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
308                         "selinux=0 auid=%u ses=%u",
309                         audit_get_loginuid(current),
310                         audit_get_sessionid(current));
311         }
312
313         length = count;
314 out:
315         free_page((unsigned long) page);
316         return length;
317 }
318 #else
319 #define sel_write_disable NULL
320 #endif
321
322 static const struct file_operations sel_disable_ops = {
323         .write          = sel_write_disable,
324         .llseek         = generic_file_llseek,
325 };
326
327 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
328                                    size_t count, loff_t *ppos)
329 {
330         char tmpbuf[TMPBUFLEN];
331         ssize_t length;
332
333         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
334         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
335 }
336
337 static const struct file_operations sel_policyvers_ops = {
338         .read           = sel_read_policyvers,
339         .llseek         = generic_file_llseek,
340 };
341
342 /* declaration for sel_write_load */
343 static int sel_make_bools(void);
344 static int sel_make_classes(void);
345 static int sel_make_policycap(void);
346
347 /* declaration for sel_make_class_dirs */
348 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
349                         unsigned long *ino);
350
351 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
352                                 size_t count, loff_t *ppos)
353 {
354         char tmpbuf[TMPBUFLEN];
355         ssize_t length;
356
357         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
358                            security_mls_enabled());
359         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
360 }
361
362 static const struct file_operations sel_mls_ops = {
363         .read           = sel_read_mls,
364         .llseek         = generic_file_llseek,
365 };
366
367 struct policy_load_memory {
368         size_t len;
369         void *data;
370 };
371
372 static int sel_open_policy(struct inode *inode, struct file *filp)
373 {
374         struct policy_load_memory *plm = NULL;
375         int rc;
376
377         BUG_ON(filp->private_data);
378
379         mutex_lock(&sel_mutex);
380
381         rc = task_has_security(current, SECURITY__READ_POLICY);
382         if (rc)
383                 goto err;
384
385         rc = -EBUSY;
386         if (policy_opened)
387                 goto err;
388
389         rc = -ENOMEM;
390         plm = kzalloc(sizeof(*plm), GFP_KERNEL);
391         if (!plm)
392                 goto err;
393
394         if (i_size_read(inode) != security_policydb_len()) {
395                 mutex_lock(&inode->i_mutex);
396                 i_size_write(inode, security_policydb_len());
397                 mutex_unlock(&inode->i_mutex);
398         }
399
400         rc = security_read_policy(&plm->data, &plm->len);
401         if (rc)
402                 goto err;
403
404         policy_opened = 1;
405
406         filp->private_data = plm;
407
408         mutex_unlock(&sel_mutex);
409
410         return 0;
411 err:
412         mutex_unlock(&sel_mutex);
413
414         if (plm)
415                 vfree(plm->data);
416         kfree(plm);
417         return rc;
418 }
419
420 static int sel_release_policy(struct inode *inode, struct file *filp)
421 {
422         struct policy_load_memory *plm = filp->private_data;
423
424         BUG_ON(!plm);
425
426         policy_opened = 0;
427
428         vfree(plm->data);
429         kfree(plm);
430
431         return 0;
432 }
433
434 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
435                                size_t count, loff_t *ppos)
436 {
437         struct policy_load_memory *plm = filp->private_data;
438         int ret;
439
440         mutex_lock(&sel_mutex);
441
442         ret = task_has_security(current, SECURITY__READ_POLICY);
443         if (ret)
444                 goto out;
445
446         ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
447 out:
448         mutex_unlock(&sel_mutex);
449         return ret;
450 }
451
452 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
453                                  struct vm_fault *vmf)
454 {
455         struct policy_load_memory *plm = vma->vm_file->private_data;
456         unsigned long offset;
457         struct page *page;
458
459         if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
460                 return VM_FAULT_SIGBUS;
461
462         offset = vmf->pgoff << PAGE_SHIFT;
463         if (offset >= roundup(plm->len, PAGE_SIZE))
464                 return VM_FAULT_SIGBUS;
465
466         page = vmalloc_to_page(plm->data + offset);
467         get_page(page);
468
469         vmf->page = page;
470
471         return 0;
472 }
473
474 static struct vm_operations_struct sel_mmap_policy_ops = {
475         .fault = sel_mmap_policy_fault,
476         .page_mkwrite = sel_mmap_policy_fault,
477 };
478
479 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
480 {
481         if (vma->vm_flags & VM_SHARED) {
482                 /* do not allow mprotect to make mapping writable */
483                 vma->vm_flags &= ~VM_MAYWRITE;
484
485                 if (vma->vm_flags & VM_WRITE)
486                         return -EACCES;
487         }
488
489         vma->vm_flags |= VM_RESERVED;
490         vma->vm_ops = &sel_mmap_policy_ops;
491
492         return 0;
493 }
494
495 static const struct file_operations sel_policy_ops = {
496         .open           = sel_open_policy,
497         .read           = sel_read_policy,
498         .mmap           = sel_mmap_policy,
499         .release        = sel_release_policy,
500 };
501
502 static ssize_t sel_write_load(struct file *file, const char __user *buf,
503                               size_t count, loff_t *ppos)
504
505 {
506         ssize_t length;
507         void *data = NULL;
508
509         mutex_lock(&sel_mutex);
510
511         length = task_has_security(current, SECURITY__LOAD_POLICY);
512         if (length)
513                 goto out;
514
515         /* No partial writes. */
516         length = -EINVAL;
517         if (*ppos != 0)
518                 goto out;
519
520         length = -EFBIG;
521         if (count > 64 * 1024 * 1024)
522                 goto out;
523
524         length = -ENOMEM;
525         data = vmalloc(count);
526         if (!data)
527                 goto out;
528
529         length = -EFAULT;
530         if (copy_from_user(data, buf, count) != 0)
531                 goto out;
532
533         length = security_load_policy(data, count);
534         if (length)
535                 goto out;
536
537         length = sel_make_bools();
538         if (length)
539                 goto out1;
540
541         length = sel_make_classes();
542         if (length)
543                 goto out1;
544
545         length = sel_make_policycap();
546         if (length)
547                 goto out1;
548
549         length = count;
550
551 out1:
552         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
553                 "policy loaded auid=%u ses=%u",
554                 audit_get_loginuid(current),
555                 audit_get_sessionid(current));
556 out:
557         mutex_unlock(&sel_mutex);
558         vfree(data);
559         return length;
560 }
561
562 static const struct file_operations sel_load_ops = {
563         .write          = sel_write_load,
564         .llseek         = generic_file_llseek,
565 };
566
567 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
568 {
569         char *canon = NULL;
570         u32 sid, len;
571         ssize_t length;
572
573         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
574         if (length)
575                 goto out;
576
577         length = security_context_to_sid(buf, size, &sid);
578         if (length)
579                 goto out;
580
581         length = security_sid_to_context(sid, &canon, &len);
582         if (length)
583                 goto out;
584
585         length = -ERANGE;
586         if (len > SIMPLE_TRANSACTION_LIMIT) {
587                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
588                         "payload max\n", __func__, len);
589                 goto out;
590         }
591
592         memcpy(buf, canon, len);
593         length = len;
594 out:
595         kfree(canon);
596         return length;
597 }
598
599 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
600                                      size_t count, loff_t *ppos)
601 {
602         char tmpbuf[TMPBUFLEN];
603         ssize_t length;
604
605         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
606         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
607 }
608
609 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
610                                       size_t count, loff_t *ppos)
611 {
612         char *page = NULL;
613         ssize_t length;
614         unsigned int new_value;
615
616         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
617         if (length)
618                 goto out;
619
620         length = -ENOMEM;
621         if (count >= PAGE_SIZE)
622                 goto out;
623
624         /* No partial writes. */
625         length = -EINVAL;
626         if (*ppos != 0)
627                 goto out;
628
629         length = -ENOMEM;
630         page = (char *)get_zeroed_page(GFP_KERNEL);
631         if (!page)
632                 goto out;
633
634         length = -EFAULT;
635         if (copy_from_user(page, buf, count))
636                 goto out;
637
638         length = -EINVAL;
639         if (sscanf(page, "%u", &new_value) != 1)
640                 goto out;
641
642         selinux_checkreqprot = new_value ? 1 : 0;
643         length = count;
644 out:
645         free_page((unsigned long) page);
646         return length;
647 }
648 static const struct file_operations sel_checkreqprot_ops = {
649         .read           = sel_read_checkreqprot,
650         .write          = sel_write_checkreqprot,
651         .llseek         = generic_file_llseek,
652 };
653
654 /*
655  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
656  */
657 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
658 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
659 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
662
663 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
664         [SEL_ACCESS] = sel_write_access,
665         [SEL_CREATE] = sel_write_create,
666         [SEL_RELABEL] = sel_write_relabel,
667         [SEL_USER] = sel_write_user,
668         [SEL_MEMBER] = sel_write_member,
669         [SEL_CONTEXT] = sel_write_context,
670 };
671
672 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
673 {
674         ino_t ino = file->f_path.dentry->d_inode->i_ino;
675         char *data;
676         ssize_t rv;
677
678         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
679                 return -EINVAL;
680
681         data = simple_transaction_get(file, buf, size);
682         if (IS_ERR(data))
683                 return PTR_ERR(data);
684
685         rv = write_op[ino](file, data, size);
686         if (rv > 0) {
687                 simple_transaction_set(file, rv);
688                 rv = size;
689         }
690         return rv;
691 }
692
693 static const struct file_operations transaction_ops = {
694         .write          = selinux_transaction_write,
695         .read           = simple_transaction_read,
696         .release        = simple_transaction_release,
697         .llseek         = generic_file_llseek,
698 };
699
700 /*
701  * payload - write methods
702  * If the method has a response, the response should be put in buf,
703  * and the length returned.  Otherwise return 0 or and -error.
704  */
705
706 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
707 {
708         char *scon = NULL, *tcon = NULL;
709         u32 ssid, tsid;
710         u16 tclass;
711         struct av_decision avd;
712         ssize_t length;
713
714         length = task_has_security(current, SECURITY__COMPUTE_AV);
715         if (length)
716                 goto out;
717
718         length = -ENOMEM;
719         scon = kzalloc(size + 1, GFP_KERNEL);
720         if (!scon)
721                 goto out;
722
723         length = -ENOMEM;
724         tcon = kzalloc(size + 1, GFP_KERNEL);
725         if (!tcon)
726                 goto out;
727
728         length = -EINVAL;
729         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
730                 goto out;
731
732         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
733         if (length)
734                 goto out;
735
736         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
737         if (length)
738                 goto out;
739
740         security_compute_av_user(ssid, tsid, tclass, &avd);
741
742         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
743                           "%x %x %x %x %u %x",
744                           avd.allowed, 0xffffffff,
745                           avd.auditallow, avd.auditdeny,
746                           avd.seqno, avd.flags);
747 out:
748         kfree(tcon);
749         kfree(scon);
750         return length;
751 }
752
753 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
754 {
755         char *scon = NULL, *tcon = NULL;
756         char *namebuf = NULL, *objname = NULL;
757         u32 ssid, tsid, newsid;
758         u16 tclass;
759         ssize_t length;
760         char *newcon = NULL;
761         u32 len;
762         int nargs;
763
764         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
765         if (length)
766                 goto out;
767
768         length = -ENOMEM;
769         scon = kzalloc(size + 1, GFP_KERNEL);
770         if (!scon)
771                 goto out;
772
773         length = -ENOMEM;
774         tcon = kzalloc(size + 1, GFP_KERNEL);
775         if (!tcon)
776                 goto out;
777
778         length = -ENOMEM;
779         namebuf = kzalloc(size + 1, GFP_KERNEL);
780         if (!namebuf)
781                 goto out;
782
783         length = -EINVAL;
784         nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
785         if (nargs < 3 || nargs > 4)
786                 goto out;
787         if (nargs == 4)
788                 objname = namebuf;
789
790         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
791         if (length)
792                 goto out;
793
794         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
795         if (length)
796                 goto out;
797
798         length = security_transition_sid_user(ssid, tsid, tclass,
799                                               objname, &newsid);
800         if (length)
801                 goto out;
802
803         length = security_sid_to_context(newsid, &newcon, &len);
804         if (length)
805                 goto out;
806
807         length = -ERANGE;
808         if (len > SIMPLE_TRANSACTION_LIMIT) {
809                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
810                         "payload max\n", __func__, len);
811                 goto out;
812         }
813
814         memcpy(buf, newcon, len);
815         length = len;
816 out:
817         kfree(newcon);
818         kfree(namebuf);
819         kfree(tcon);
820         kfree(scon);
821         return length;
822 }
823
824 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
825 {
826         char *scon = NULL, *tcon = NULL;
827         u32 ssid, tsid, newsid;
828         u16 tclass;
829         ssize_t length;
830         char *newcon = NULL;
831         u32 len;
832
833         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
834         if (length)
835                 goto out;
836
837         length = -ENOMEM;
838         scon = kzalloc(size + 1, GFP_KERNEL);
839         if (!scon)
840                 goto out;
841
842         length = -ENOMEM;
843         tcon = kzalloc(size + 1, GFP_KERNEL);
844         if (!tcon)
845                 goto out;
846
847         length = -EINVAL;
848         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
849                 goto out;
850
851         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
852         if (length)
853                 goto out;
854
855         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
856         if (length)
857                 goto out;
858
859         length = security_change_sid(ssid, tsid, tclass, &newsid);
860         if (length)
861                 goto out;
862
863         length = security_sid_to_context(newsid, &newcon, &len);
864         if (length)
865                 goto out;
866
867         length = -ERANGE;
868         if (len > SIMPLE_TRANSACTION_LIMIT)
869                 goto out;
870
871         memcpy(buf, newcon, len);
872         length = len;
873 out:
874         kfree(newcon);
875         kfree(tcon);
876         kfree(scon);
877         return length;
878 }
879
880 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
881 {
882         char *con = NULL, *user = NULL, *ptr;
883         u32 sid, *sids = NULL;
884         ssize_t length;
885         char *newcon;
886         int i, rc;
887         u32 len, nsids;
888
889         length = task_has_security(current, SECURITY__COMPUTE_USER);
890         if (length)
891                 goto out;;
892
893         length = -ENOMEM;
894         con = kzalloc(size + 1, GFP_KERNEL);
895         if (!con)
896                 goto out;;
897
898         length = -ENOMEM;
899         user = kzalloc(size + 1, GFP_KERNEL);
900         if (!user)
901                 goto out;
902
903         length = -EINVAL;
904         if (sscanf(buf, "%s %s", con, user) != 2)
905                 goto out;
906
907         length = security_context_to_sid(con, strlen(con) + 1, &sid);
908         if (length)
909                 goto out;
910
911         length = security_get_user_sids(sid, user, &sids, &nsids);
912         if (length)
913                 goto out;
914
915         length = sprintf(buf, "%u", nsids) + 1;
916         ptr = buf + length;
917         for (i = 0; i < nsids; i++) {
918                 rc = security_sid_to_context(sids[i], &newcon, &len);
919                 if (rc) {
920                         length = rc;
921                         goto out;
922                 }
923                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
924                         kfree(newcon);
925                         length = -ERANGE;
926                         goto out;
927                 }
928                 memcpy(ptr, newcon, len);
929                 kfree(newcon);
930                 ptr += len;
931                 length += len;
932         }
933 out:
934         kfree(sids);
935         kfree(user);
936         kfree(con);
937         return length;
938 }
939
940 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
941 {
942         char *scon = NULL, *tcon = NULL;
943         u32 ssid, tsid, newsid;
944         u16 tclass;
945         ssize_t length;
946         char *newcon = NULL;
947         u32 len;
948
949         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
950         if (length)
951                 goto out;
952
953         length = -ENOMEM;
954         scon = kzalloc(size + 1, GFP_KERNEL);
955         if (!scon)
956                 goto out;;
957
958         length = -ENOMEM;
959         tcon = kzalloc(size + 1, GFP_KERNEL);
960         if (!tcon)
961                 goto out;
962
963         length = -EINVAL;
964         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
965                 goto out;
966
967         length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
968         if (length)
969                 goto out;
970
971         length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
972         if (length)
973                 goto out;
974
975         length = security_member_sid(ssid, tsid, tclass, &newsid);
976         if (length)
977                 goto out;
978
979         length = security_sid_to_context(newsid, &newcon, &len);
980         if (length)
981                 goto out;
982
983         length = -ERANGE;
984         if (len > SIMPLE_TRANSACTION_LIMIT) {
985                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
986                         "payload max\n", __func__, len);
987                 goto out;
988         }
989
990         memcpy(buf, newcon, len);
991         length = len;
992 out:
993         kfree(newcon);
994         kfree(tcon);
995         kfree(scon);
996         return length;
997 }
998
999 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1000 {
1001         struct inode *ret = new_inode(sb);
1002
1003         if (ret) {
1004                 ret->i_mode = mode;
1005                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1006         }
1007         return ret;
1008 }
1009
1010 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1011                              size_t count, loff_t *ppos)
1012 {
1013         char *page = NULL;
1014         ssize_t length;
1015         ssize_t ret;
1016         int cur_enforcing;
1017         struct inode *inode = filep->f_path.dentry->d_inode;
1018         unsigned index = inode->i_ino & SEL_INO_MASK;
1019         const char *name = filep->f_path.dentry->d_name.name;
1020
1021         mutex_lock(&sel_mutex);
1022
1023         ret = -EINVAL;
1024         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1025                 goto out;
1026
1027         ret = -ENOMEM;
1028         page = (char *)get_zeroed_page(GFP_KERNEL);
1029         if (!page)
1030                 goto out;
1031
1032         cur_enforcing = security_get_bool_value(index);
1033         if (cur_enforcing < 0) {
1034                 ret = cur_enforcing;
1035                 goto out;
1036         }
1037         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1038                           bool_pending_values[index]);
1039         ret = simple_read_from_buffer(buf, count, ppos, page, length);
1040 out:
1041         mutex_unlock(&sel_mutex);
1042         free_page((unsigned long)page);
1043         return ret;
1044 }
1045
1046 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1047                               size_t count, loff_t *ppos)
1048 {
1049         char *page = NULL;
1050         ssize_t length;
1051         int new_value;
1052         struct inode *inode = filep->f_path.dentry->d_inode;
1053         unsigned index = inode->i_ino & SEL_INO_MASK;
1054         const char *name = filep->f_path.dentry->d_name.name;
1055
1056         mutex_lock(&sel_mutex);
1057
1058         length = task_has_security(current, SECURITY__SETBOOL);
1059         if (length)
1060                 goto out;
1061
1062         length = -EINVAL;
1063         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1064                 goto out;
1065
1066         length = -ENOMEM;
1067         if (count >= PAGE_SIZE)
1068                 goto out;
1069
1070         /* No partial writes. */
1071         length = -EINVAL;
1072         if (*ppos != 0)
1073                 goto out;
1074
1075         length = -ENOMEM;
1076         page = (char *)get_zeroed_page(GFP_KERNEL);
1077         if (!page)
1078                 goto out;
1079
1080         length = -EFAULT;
1081         if (copy_from_user(page, buf, count))
1082                 goto out;
1083
1084         length = -EINVAL;
1085         if (sscanf(page, "%d", &new_value) != 1)
1086                 goto out;
1087
1088         if (new_value)
1089                 new_value = 1;
1090
1091         bool_pending_values[index] = new_value;
1092         length = count;
1093
1094 out:
1095         mutex_unlock(&sel_mutex);
1096         free_page((unsigned long) page);
1097         return length;
1098 }
1099
1100 static const struct file_operations sel_bool_ops = {
1101         .read           = sel_read_bool,
1102         .write          = sel_write_bool,
1103         .llseek         = generic_file_llseek,
1104 };
1105
1106 static ssize_t sel_commit_bools_write(struct file *filep,
1107                                       const char __user *buf,
1108                                       size_t count, loff_t *ppos)
1109 {
1110         char *page = NULL;
1111         ssize_t length;
1112         int new_value;
1113
1114         mutex_lock(&sel_mutex);
1115
1116         length = task_has_security(current, SECURITY__SETBOOL);
1117         if (length)
1118                 goto out;
1119
1120         length = -ENOMEM;
1121         if (count >= PAGE_SIZE)
1122                 goto out;
1123
1124         /* No partial writes. */
1125         length = -EINVAL;
1126         if (*ppos != 0)
1127                 goto out;
1128
1129         length = -ENOMEM;
1130         page = (char *)get_zeroed_page(GFP_KERNEL);
1131         if (!page)
1132                 goto out;
1133
1134         length = -EFAULT;
1135         if (copy_from_user(page, buf, count))
1136                 goto out;
1137
1138         length = -EINVAL;
1139         if (sscanf(page, "%d", &new_value) != 1)
1140                 goto out;
1141
1142         length = 0;
1143         if (new_value && bool_pending_values)
1144                 length = security_set_bools(bool_num, bool_pending_values);
1145
1146         if (!length)
1147                 length = count;
1148
1149 out:
1150         mutex_unlock(&sel_mutex);
1151         free_page((unsigned long) page);
1152         return length;
1153 }
1154
1155 static const struct file_operations sel_commit_bools_ops = {
1156         .write          = sel_commit_bools_write,
1157         .llseek         = generic_file_llseek,
1158 };
1159
1160 static void sel_remove_entries(struct dentry *de)
1161 {
1162         struct list_head *node;
1163
1164         spin_lock(&de->d_lock);
1165         node = de->d_subdirs.next;
1166         while (node != &de->d_subdirs) {
1167                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1168
1169                 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
1170                 list_del_init(node);
1171
1172                 if (d->d_inode) {
1173                         dget_dlock(d);
1174                         spin_unlock(&de->d_lock);
1175                         spin_unlock(&d->d_lock);
1176                         d_delete(d);
1177                         simple_unlink(de->d_inode, d);
1178                         dput(d);
1179                         spin_lock(&de->d_lock);
1180                 } else
1181                         spin_unlock(&d->d_lock);
1182                 node = de->d_subdirs.next;
1183         }
1184
1185         spin_unlock(&de->d_lock);
1186 }
1187
1188 #define BOOL_DIR_NAME "booleans"
1189
1190 static int sel_make_bools(void)
1191 {
1192         int i, ret;
1193         ssize_t len;
1194         struct dentry *dentry = NULL;
1195         struct dentry *dir = bool_dir;
1196         struct inode *inode = NULL;
1197         struct inode_security_struct *isec;
1198         char **names = NULL, *page;
1199         int num;
1200         int *values = NULL;
1201         u32 sid;
1202
1203         /* remove any existing files */
1204         for (i = 0; i < bool_num; i++)
1205                 kfree(bool_pending_names[i]);
1206         kfree(bool_pending_names);
1207         kfree(bool_pending_values);
1208         bool_pending_names = NULL;
1209         bool_pending_values = NULL;
1210
1211         sel_remove_entries(dir);
1212
1213         ret = -ENOMEM;
1214         page = (char *)get_zeroed_page(GFP_KERNEL);
1215         if (!page)
1216                 goto out;
1217
1218         ret = security_get_bools(&num, &names, &values);
1219         if (ret)
1220                 goto out;
1221
1222         for (i = 0; i < num; i++) {
1223                 ret = -ENOMEM;
1224                 dentry = d_alloc_name(dir, names[i]);
1225                 if (!dentry)
1226                         goto out;
1227
1228                 ret = -ENOMEM;
1229                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1230                 if (!inode)
1231                         goto out;
1232
1233                 ret = -EINVAL;
1234                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1235                 if (len < 0)
1236                         goto out;
1237
1238                 ret = -ENAMETOOLONG;
1239                 if (len >= PAGE_SIZE)
1240                         goto out;
1241
1242                 isec = (struct inode_security_struct *)inode->i_security;
1243                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1244                 if (ret)
1245                         goto out;
1246
1247                 isec->sid = sid;
1248                 isec->initialized = 1;
1249                 inode->i_fop = &sel_bool_ops;
1250                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1251                 d_add(dentry, inode);
1252         }
1253         bool_num = num;
1254         bool_pending_names = names;
1255         bool_pending_values = values;
1256
1257         free_page((unsigned long)page);
1258         return 0;
1259 out:
1260         free_page((unsigned long)page);
1261
1262         if (names) {
1263                 for (i = 0; i < num; i++)
1264                         kfree(names[i]);
1265                 kfree(names);
1266         }
1267         kfree(values);
1268         sel_remove_entries(dir);
1269
1270         return ret;
1271 }
1272
1273 #define NULL_FILE_NAME "null"
1274
1275 struct dentry *selinux_null;
1276
1277 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1278                                             size_t count, loff_t *ppos)
1279 {
1280         char tmpbuf[TMPBUFLEN];
1281         ssize_t length;
1282
1283         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1284         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1285 }
1286
1287 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1288                                              const char __user *buf,
1289                                              size_t count, loff_t *ppos)
1290
1291 {
1292         char *page = NULL;
1293         ssize_t ret;
1294         int new_value;
1295
1296         ret = task_has_security(current, SECURITY__SETSECPARAM);
1297         if (ret)
1298                 goto out;
1299
1300         ret = -ENOMEM;
1301         if (count >= PAGE_SIZE)
1302                 goto out;
1303
1304         /* No partial writes. */
1305         ret = -EINVAL;
1306         if (*ppos != 0)
1307                 goto out;
1308
1309         ret = -ENOMEM;
1310         page = (char *)get_zeroed_page(GFP_KERNEL);
1311         if (!page)
1312                 goto out;
1313
1314         ret = -EFAULT;
1315         if (copy_from_user(page, buf, count))
1316                 goto out;
1317
1318         ret = -EINVAL;
1319         if (sscanf(page, "%u", &new_value) != 1)
1320                 goto out;
1321
1322         avc_cache_threshold = new_value;
1323
1324         ret = count;
1325 out:
1326         free_page((unsigned long)page);
1327         return ret;
1328 }
1329
1330 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1331                                        size_t count, loff_t *ppos)
1332 {
1333         char *page;
1334         ssize_t length;
1335
1336         page = (char *)__get_free_page(GFP_KERNEL);
1337         if (!page)
1338                 return -ENOMEM;
1339
1340         length = avc_get_hash_stats(page);
1341         if (length >= 0)
1342                 length = simple_read_from_buffer(buf, count, ppos, page, length);
1343         free_page((unsigned long)page);
1344
1345         return length;
1346 }
1347
1348 static const struct file_operations sel_avc_cache_threshold_ops = {
1349         .read           = sel_read_avc_cache_threshold,
1350         .write          = sel_write_avc_cache_threshold,
1351         .llseek         = generic_file_llseek,
1352 };
1353
1354 static const struct file_operations sel_avc_hash_stats_ops = {
1355         .read           = sel_read_avc_hash_stats,
1356         .llseek         = generic_file_llseek,
1357 };
1358
1359 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1360 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1361 {
1362         int cpu;
1363
1364         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1365                 if (!cpu_possible(cpu))
1366                         continue;
1367                 *idx = cpu + 1;
1368                 return &per_cpu(avc_cache_stats, cpu);
1369         }
1370         return NULL;
1371 }
1372
1373 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1374 {
1375         loff_t n = *pos - 1;
1376
1377         if (*pos == 0)
1378                 return SEQ_START_TOKEN;
1379
1380         return sel_avc_get_stat_idx(&n);
1381 }
1382
1383 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1384 {
1385         return sel_avc_get_stat_idx(pos);
1386 }
1387
1388 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1389 {
1390         struct avc_cache_stats *st = v;
1391
1392         if (v == SEQ_START_TOKEN)
1393                 seq_printf(seq, "lookups hits misses allocations reclaims "
1394                            "frees\n");
1395         else
1396                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1397                            st->hits, st->misses, st->allocations,
1398                            st->reclaims, st->frees);
1399         return 0;
1400 }
1401
1402 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1403 { }
1404
1405 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1406         .start          = sel_avc_stats_seq_start,
1407         .next           = sel_avc_stats_seq_next,
1408         .show           = sel_avc_stats_seq_show,
1409         .stop           = sel_avc_stats_seq_stop,
1410 };
1411
1412 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1413 {
1414         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1415 }
1416
1417 static const struct file_operations sel_avc_cache_stats_ops = {
1418         .open           = sel_open_avc_cache_stats,
1419         .read           = seq_read,
1420         .llseek         = seq_lseek,
1421         .release        = seq_release,
1422 };
1423 #endif
1424
1425 static int sel_make_avc_files(struct dentry *dir)
1426 {
1427         int i;
1428         static struct tree_descr files[] = {
1429                 { "cache_threshold",
1430                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1431                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1432 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1433                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1434 #endif
1435         };
1436
1437         for (i = 0; i < ARRAY_SIZE(files); i++) {
1438                 struct inode *inode;
1439                 struct dentry *dentry;
1440
1441                 dentry = d_alloc_name(dir, files[i].name);
1442                 if (!dentry)
1443                         return -ENOMEM;
1444
1445                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1446                 if (!inode)
1447                         return -ENOMEM;
1448
1449                 inode->i_fop = files[i].ops;
1450                 inode->i_ino = ++sel_last_ino;
1451                 d_add(dentry, inode);
1452         }
1453
1454         return 0;
1455 }
1456
1457 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1458                                 size_t count, loff_t *ppos)
1459 {
1460         struct inode *inode;
1461         char *con;
1462         u32 sid, len;
1463         ssize_t ret;
1464
1465         inode = file->f_path.dentry->d_inode;
1466         sid = inode->i_ino&SEL_INO_MASK;
1467         ret = security_sid_to_context(sid, &con, &len);
1468         if (ret)
1469                 return ret;
1470
1471         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1472         kfree(con);
1473         return ret;
1474 }
1475
1476 static const struct file_operations sel_initcon_ops = {
1477         .read           = sel_read_initcon,
1478         .llseek         = generic_file_llseek,
1479 };
1480
1481 static int sel_make_initcon_files(struct dentry *dir)
1482 {
1483         int i;
1484
1485         for (i = 1; i <= SECINITSID_NUM; i++) {
1486                 struct inode *inode;
1487                 struct dentry *dentry;
1488                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1489                 if (!dentry)
1490                         return -ENOMEM;
1491
1492                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1493                 if (!inode)
1494                         return -ENOMEM;
1495
1496                 inode->i_fop = &sel_initcon_ops;
1497                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1498                 d_add(dentry, inode);
1499         }
1500
1501         return 0;
1502 }
1503
1504 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1505 {
1506         return a / b - (a % b < 0);
1507 }
1508
1509 static inline unsigned long sel_class_to_ino(u16 class)
1510 {
1511         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1512 }
1513
1514 static inline u16 sel_ino_to_class(unsigned long ino)
1515 {
1516         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1517 }
1518
1519 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1520 {
1521         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1522 }
1523
1524 static inline u32 sel_ino_to_perm(unsigned long ino)
1525 {
1526         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1527 }
1528
1529 static ssize_t sel_read_class(struct file *file, char __user *buf,
1530                                 size_t count, loff_t *ppos)
1531 {
1532         ssize_t rc, len;
1533         char *page;
1534         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1535
1536         page = (char *)__get_free_page(GFP_KERNEL);
1537         if (!page)
1538                 return -ENOMEM;
1539
1540         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1541         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1542         free_page((unsigned long)page);
1543
1544         return rc;
1545 }
1546
1547 static const struct file_operations sel_class_ops = {
1548         .read           = sel_read_class,
1549         .llseek         = generic_file_llseek,
1550 };
1551
1552 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1553                                 size_t count, loff_t *ppos)
1554 {
1555         ssize_t rc, len;
1556         char *page;
1557         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1558
1559         page = (char *)__get_free_page(GFP_KERNEL);
1560         if (!page)
1561                 return -ENOMEM;
1562
1563         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1564         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1565         free_page((unsigned long)page);
1566
1567         return rc;
1568 }
1569
1570 static const struct file_operations sel_perm_ops = {
1571         .read           = sel_read_perm,
1572         .llseek         = generic_file_llseek,
1573 };
1574
1575 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1576                                   size_t count, loff_t *ppos)
1577 {
1578         int value;
1579         char tmpbuf[TMPBUFLEN];
1580         ssize_t length;
1581         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1582
1583         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1584         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1585
1586         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1587 }
1588
1589 static const struct file_operations sel_policycap_ops = {
1590         .read           = sel_read_policycap,
1591         .llseek         = generic_file_llseek,
1592 };
1593
1594 static int sel_make_perm_files(char *objclass, int classvalue,
1595                                 struct dentry *dir)
1596 {
1597         int i, rc, nperms;
1598         char **perms;
1599
1600         rc = security_get_permissions(objclass, &perms, &nperms);
1601         if (rc)
1602                 return rc;
1603
1604         for (i = 0; i < nperms; i++) {
1605                 struct inode *inode;
1606                 struct dentry *dentry;
1607
1608                 rc = -ENOMEM;
1609                 dentry = d_alloc_name(dir, perms[i]);
1610                 if (!dentry)
1611                         goto out;
1612
1613                 rc = -ENOMEM;
1614                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1615                 if (!inode)
1616                         goto out;
1617
1618                 inode->i_fop = &sel_perm_ops;
1619                 /* i+1 since perm values are 1-indexed */
1620                 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1621                 d_add(dentry, inode);
1622         }
1623         rc = 0;
1624 out:
1625         for (i = 0; i < nperms; i++)
1626                 kfree(perms[i]);
1627         kfree(perms);
1628         return rc;
1629 }
1630
1631 static int sel_make_class_dir_entries(char *classname, int index,
1632                                         struct dentry *dir)
1633 {
1634         struct dentry *dentry = NULL;
1635         struct inode *inode = NULL;
1636         int rc;
1637
1638         dentry = d_alloc_name(dir, "index");
1639         if (!dentry)
1640                 return -ENOMEM;
1641
1642         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1643         if (!inode)
1644                 return -ENOMEM;
1645
1646         inode->i_fop = &sel_class_ops;
1647         inode->i_ino = sel_class_to_ino(index);
1648         d_add(dentry, inode);
1649
1650         dentry = d_alloc_name(dir, "perms");
1651         if (!dentry)
1652                 return -ENOMEM;
1653
1654         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1655         if (rc)
1656                 return rc;
1657
1658         rc = sel_make_perm_files(classname, index, dentry);
1659
1660         return rc;
1661 }
1662
1663 static void sel_remove_classes(void)
1664 {
1665         struct list_head *class_node;
1666
1667         list_for_each(class_node, &class_dir->d_subdirs) {
1668                 struct dentry *class_subdir = list_entry(class_node,
1669                                         struct dentry, d_u.d_child);
1670                 struct list_head *class_subdir_node;
1671
1672                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1673                         struct dentry *d = list_entry(class_subdir_node,
1674                                                 struct dentry, d_u.d_child);
1675
1676                         if (d->d_inode)
1677                                 if (d->d_inode->i_mode & S_IFDIR)
1678                                         sel_remove_entries(d);
1679                 }
1680
1681                 sel_remove_entries(class_subdir);
1682         }
1683
1684         sel_remove_entries(class_dir);
1685 }
1686
1687 static int sel_make_classes(void)
1688 {
1689         int rc, nclasses, i;
1690         char **classes;
1691
1692         /* delete any existing entries */
1693         sel_remove_classes();
1694
1695         rc = security_get_classes(&classes, &nclasses);
1696         if (rc)
1697                 return rc;
1698
1699         /* +2 since classes are 1-indexed */
1700         last_class_ino = sel_class_to_ino(nclasses + 2);
1701
1702         for (i = 0; i < nclasses; i++) {
1703                 struct dentry *class_name_dir;
1704
1705                 rc = -ENOMEM;
1706                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1707                 if (!class_name_dir)
1708                         goto out;
1709
1710                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1711                                 &last_class_ino);
1712                 if (rc)
1713                         goto out;
1714
1715                 /* i+1 since class values are 1-indexed */
1716                 rc = sel_make_class_dir_entries(classes[i], i + 1,
1717                                 class_name_dir);
1718                 if (rc)
1719                         goto out;
1720         }
1721         rc = 0;
1722 out:
1723         for (i = 0; i < nclasses; i++)
1724                 kfree(classes[i]);
1725         kfree(classes);
1726         return rc;
1727 }
1728
1729 static int sel_make_policycap(void)
1730 {
1731         unsigned int iter;
1732         struct dentry *dentry = NULL;
1733         struct inode *inode = NULL;
1734
1735         sel_remove_entries(policycap_dir);
1736
1737         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1738                 if (iter < ARRAY_SIZE(policycap_names))
1739                         dentry = d_alloc_name(policycap_dir,
1740                                               policycap_names[iter]);
1741                 else
1742                         dentry = d_alloc_name(policycap_dir, "unknown");
1743
1744                 if (dentry == NULL)
1745                         return -ENOMEM;
1746
1747                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1748                 if (inode == NULL)
1749                         return -ENOMEM;
1750
1751                 inode->i_fop = &sel_policycap_ops;
1752                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1753                 d_add(dentry, inode);
1754         }
1755
1756         return 0;
1757 }
1758
1759 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1760                         unsigned long *ino)
1761 {
1762         struct inode *inode;
1763
1764         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1765         if (!inode)
1766                 return -ENOMEM;
1767
1768         inode->i_op = &simple_dir_inode_operations;
1769         inode->i_fop = &simple_dir_operations;
1770         inode->i_ino = ++(*ino);
1771         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1772         inc_nlink(inode);
1773         d_add(dentry, inode);
1774         /* bump link count on parent directory, too */
1775         inc_nlink(dir);
1776
1777         return 0;
1778 }
1779
1780 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1781 {
1782         int ret;
1783         struct dentry *dentry;
1784         struct inode *inode, *root_inode;
1785         struct inode_security_struct *isec;
1786
1787         static struct tree_descr selinux_files[] = {
1788                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1789                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1790                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1791                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1792                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1793                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1794                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1795                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1796                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1797                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1798                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1799                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1800                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1801                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1802                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1803                 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1804                 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1805                 /* last one */ {""}
1806         };
1807         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1808         if (ret)
1809                 goto err;
1810
1811         root_inode = sb->s_root->d_inode;
1812
1813         ret = -ENOMEM;
1814         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1815         if (!dentry)
1816                 goto err;
1817
1818         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1819         if (ret)
1820                 goto err;
1821
1822         bool_dir = dentry;
1823
1824         ret = -ENOMEM;
1825         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1826         if (!dentry)
1827                 goto err;
1828
1829         ret = -ENOMEM;
1830         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1831         if (!inode)
1832                 goto err;
1833
1834         inode->i_ino = ++sel_last_ino;
1835         isec = (struct inode_security_struct *)inode->i_security;
1836         isec->sid = SECINITSID_DEVNULL;
1837         isec->sclass = SECCLASS_CHR_FILE;
1838         isec->initialized = 1;
1839
1840         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1841         d_add(dentry, inode);
1842         selinux_null = dentry;
1843
1844         ret = -ENOMEM;
1845         dentry = d_alloc_name(sb->s_root, "avc");
1846         if (!dentry)
1847                 goto err;
1848
1849         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1850         if (ret)
1851                 goto err;
1852
1853         ret = sel_make_avc_files(dentry);
1854         if (ret)
1855                 goto err;
1856
1857         ret = -ENOMEM;
1858         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1859         if (!dentry)
1860                 goto err;
1861
1862         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1863         if (ret)
1864                 goto err;
1865
1866         ret = sel_make_initcon_files(dentry);
1867         if (ret)
1868                 goto err;
1869
1870         ret = -ENOMEM;
1871         dentry = d_alloc_name(sb->s_root, "class");
1872         if (!dentry)
1873                 goto err;
1874
1875         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1876         if (ret)
1877                 goto err;
1878
1879         class_dir = dentry;
1880
1881         ret = -ENOMEM;
1882         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1883         if (!dentry)
1884                 goto err;
1885
1886         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1887         if (ret)
1888                 goto err;
1889
1890         policycap_dir = dentry;
1891
1892         return 0;
1893 err:
1894         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1895                 __func__);
1896         return ret;
1897 }
1898
1899 static struct dentry *sel_mount(struct file_system_type *fs_type,
1900                       int flags, const char *dev_name, void *data)
1901 {
1902         return mount_single(fs_type, flags, data, sel_fill_super);
1903 }
1904
1905 static struct file_system_type sel_fs_type = {
1906         .name           = "selinuxfs",
1907         .mount          = sel_mount,
1908         .kill_sb        = kill_litter_super,
1909 };
1910
1911 struct vfsmount *selinuxfs_mount;
1912
1913 static int __init init_sel_fs(void)
1914 {
1915         int err;
1916
1917         if (!selinux_enabled)
1918                 return 0;
1919         err = register_filesystem(&sel_fs_type);
1920         if (err)
1921                 return err;
1922
1923         selinuxfs_mount = kern_mount(&sel_fs_type);
1924         if (IS_ERR(selinuxfs_mount)) {
1925                 printk(KERN_ERR "selinuxfs:  could not mount!\n");
1926                 err = PTR_ERR(selinuxfs_mount);
1927                 selinuxfs_mount = NULL;
1928         }
1929
1930         return err;
1931 }
1932
1933 __initcall(init_sel_fs);
1934
1935 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1936 void exit_sel_fs(void)
1937 {
1938         unregister_filesystem(&sel_fs_type);
1939 }
1940 #endif