blob: c0e1a0f524624c97b3f5950df74c04ab2269212c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
Eric Paris18729812008-04-17 14:15:45 -04003 * Added conditional policy language extensions
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Paul Moore3bb56b22008-01-29 08:38:19 -05005 * Updated: Hewlett-Packard <paul.moore@hp.com>
6 *
Eric Paris18729812008-04-17 14:15:45 -04007 * Added support for the policy capability bitmap
Paul Moore3bb56b22008-01-29 08:38:19 -05008 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Eric Paris18729812008-04-17 14:15:45 -040013 * it under the terms of the GNU General Public License as published by
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * the Free Software Foundation, version 2.
15 */
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/kernel.h>
18#include <linux/pagemap.h>
19#include <linux/slab.h>
20#include <linux/vmalloc.h>
21#include <linux/fs.h>
Ingo Molnarbb003072006-03-22 00:09:14 -080022#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#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>
Steve Grubbaf601e42006-01-04 14:08:39 +000029#include <linux/audit.h>
Eric Parisf5269712008-05-14 11:27:45 -040030#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
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
Paul Moore3bb56b22008-01-29 08:38:19 -050042/* Policy capability filenames */
43static char *policycap_names[] = {
Eric Parisb0c636b2008-02-28 12:58:40 -050044 "network_peer_controls",
45 "open_perms"
Paul Moore3bb56b22008-01-29 08:38:19 -050046};
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50static int __init checkreqprot_setup(char *str)
51{
Eric Parisf5269712008-05-14 11:27:45 -040052 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return 1;
56}
57__setup("checkreqprot=", checkreqprot_setup);
58
Ingo Molnarbb003072006-03-22 00:09:14 -080059static DEFINE_MUTEX(sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61/* global data for booleans */
Eric Paris18729812008-04-17 14:15:45 -040062static struct dentry *bool_dir;
63static int bool_num;
Stephen Smalleyd313f942007-11-26 11:12:53 -050064static char **bool_pending_names;
Eric Paris18729812008-04-17 14:15:45 -040065static int *bool_pending_values;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040067/* global data for classes */
Eric Paris18729812008-04-17 14:15:45 -040068static struct dentry *class_dir;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040069static unsigned long last_class_ino;
70
Eric Pariscee74f42010-10-13 17:50:25 -040071static char policy_opened;
72
Paul Moore3bb56b22008-01-29 08:38:19 -050073/* global data for policy capabilities */
Eric Paris18729812008-04-17 14:15:45 -040074static struct dentry *policycap_dir;
Paul Moore3bb56b22008-01-29 08:38:19 -050075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076extern void selnl_notify_setenforce(int val);
77
78/* Check whether a task is allowed to use a security operation. */
79static int task_has_security(struct task_struct *tsk,
80 u32 perms)
81{
David Howellsc69e8d92008-11-14 10:39:19 +110082 const struct task_security_struct *tsec;
83 u32 sid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
David Howellsc69e8d92008-11-14 10:39:19 +110085 rcu_read_lock();
86 tsec = __task_cred(tsk)->security;
87 if (tsec)
88 sid = tsec->sid;
89 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 if (!tsec)
91 return -EACCES;
92
David Howellsc69e8d92008-11-14 10:39:19 +110093 return avc_has_perm(sid, SECINITSID_SECURITY,
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 SECCLASS_SECURITY, perms, NULL);
95}
96
97enum sel_inos {
98 SEL_ROOT_INO = 2,
99 SEL_LOAD, /* load policy */
100 SEL_ENFORCE, /* get or set enforcing status */
101 SEL_CONTEXT, /* validate context */
102 SEL_ACCESS, /* compute access decision */
103 SEL_CREATE, /* compute create labeling decision */
104 SEL_RELABEL, /* compute relabeling decision */
105 SEL_USER, /* compute reachable user contexts */
106 SEL_POLICYVERS, /* return policy version for this kernel */
107 SEL_COMMIT_BOOLS, /* commit new boolean values */
108 SEL_MLS, /* return if MLS policy is enabled */
109 SEL_DISABLE, /* disable SELinux until next reboot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 SEL_MEMBER, /* compute polyinstantiation membership decision */
111 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
James Morris4e5ab4c2006-06-09 00:33:33 -0700112 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
Eric Paris3f120702007-09-21 14:37:10 -0400113 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
KaiGai Kohei11904162010-09-14 18:28:39 +0900115 SEL_STATUS, /* export current status using mmap() */
Eric Pariscee74f42010-10-13 17:50:25 -0400116 SEL_POLICY, /* allow userspace to read the in kernel policy */
James Carter6174eaf2007-04-04 16:18:39 -0400117 SEL_INO_NEXT, /* The next inode number to use */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118};
119
James Carter6174eaf2007-04-04 16:18:39 -0400120static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
121
Paul Moore3bb56b22008-01-29 08:38:19 -0500122#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
James Carterf0ee2e42007-04-04 10:11:29 -0400127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#define TMPBUFLEN 12
129static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130 size_t count, loff_t *ppos)
131{
132 char tmpbuf[TMPBUFLEN];
133 ssize_t length;
134
135 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
137}
138
139#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
Eric Paris18729812008-04-17 14:15:45 -0400140static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 size_t count, loff_t *ppos)
142
143{
Eric Parisb77a4932010-11-23 11:40:08 -0500144 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 ssize_t length;
146 int new_value;
147
Eric Parisb77a4932010-11-23 11:40:08 -0500148 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800149 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500150 goto out;
151
152 /* No partial writes. */
153 length = EINVAL;
154 if (*ppos != 0)
155 goto out;
156
157 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400158 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500160 goto out;
161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 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;
Steve Grubbaf601e42006-01-04 14:08:39 +0000174 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500175 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176 new_value, selinux_enforcing,
177 audit_get_loginuid(current),
178 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 selinux_enforcing = new_value;
180 if (selinux_enforcing)
181 avc_ss_reset(0);
182 selnl_notify_setenforce(selinux_enforcing);
KaiGai Kohei11904162010-09-14 18:28:39 +0900183 selinux_status_update_setenforce(selinux_enforcing);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 length = count;
186out:
187 free_page((unsigned long) page);
188 return length;
189}
190#else
191#define sel_write_enforce NULL
192#endif
193
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800194static const struct file_operations sel_enforce_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 .read = sel_read_enforce,
196 .write = sel_write_enforce,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200197 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198};
199
Eric Paris3f120702007-09-21 14:37:10 -0400200static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201 size_t count, loff_t *ppos)
202{
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown() : !security_get_allow_unknown();
208
209 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211}
212
213static const struct file_operations sel_handle_unknown_ops = {
214 .read = sel_read_handle_unknown,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200215 .llseek = generic_file_llseek,
Eric Paris3f120702007-09-21 14:37:10 -0400216};
217
KaiGai Kohei11904162010-09-14 18:28:39 +0900218static int sel_open_handle_status(struct inode *inode, struct file *filp)
219{
220 struct page *status = selinux_kernel_status_page();
221
222 if (!status)
223 return -ENOMEM;
224
225 filp->private_data = status;
226
227 return 0;
228}
229
230static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231 size_t count, loff_t *ppos)
232{
233 struct page *status = filp->private_data;
234
235 BUG_ON(!status);
236
237 return simple_read_from_buffer(buf, count, ppos,
238 page_address(status),
239 sizeof(struct selinux_kernel_status));
240}
241
242static int sel_mmap_handle_status(struct file *filp,
243 struct vm_area_struct *vma)
244{
245 struct page *status = filp->private_data;
246 unsigned long size = vma->vm_end - vma->vm_start;
247
248 BUG_ON(!status);
249
250 /* only allows one page from the head */
251 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
252 return -EIO;
253 /* disallow writable mapping */
254 if (vma->vm_flags & VM_WRITE)
255 return -EPERM;
256 /* disallow mprotect() turns it into writable */
257 vma->vm_flags &= ~VM_MAYWRITE;
258
259 return remap_pfn_range(vma, vma->vm_start,
260 page_to_pfn(status),
261 size, vma->vm_page_prot);
262}
263
264static const struct file_operations sel_handle_status_ops = {
265 .open = sel_open_handle_status,
266 .read = sel_read_handle_status,
267 .mmap = sel_mmap_handle_status,
268 .llseek = generic_file_llseek,
269};
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271#ifdef CONFIG_SECURITY_SELINUX_DISABLE
Eric Paris18729812008-04-17 14:15:45 -0400272static ssize_t sel_write_disable(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 size_t count, loff_t *ppos)
274
275{
Eric Parisb77a4932010-11-23 11:40:08 -0500276 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 ssize_t length;
278 int new_value;
279 extern int selinux_disable(void);
280
Eric Parisb77a4932010-11-23 11:40:08 -0500281 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800282 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500283 goto out;;
284
285 /* No partial writes. */
286 length = -EINVAL;
287 if (*ppos != 0)
288 goto out;
289
290 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400291 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500293 goto out;
294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 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();
Eric Parisb77a4932010-11-23 11:40:08 -0500305 if (length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000307 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500308 "selinux=0 auid=%u ses=%u",
309 audit_get_loginuid(current),
310 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
312
313 length = count;
314out:
315 free_page((unsigned long) page);
316 return length;
317}
318#else
319#define sel_write_disable NULL
320#endif
321
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800322static const struct file_operations sel_disable_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 .write = sel_write_disable,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200324 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325};
326
327static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
Eric Paris18729812008-04-17 14:15:45 -0400328 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
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
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800337static const struct file_operations sel_policyvers_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 .read = sel_read_policyvers,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200339 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340};
341
342/* declaration for sel_write_load */
343static int sel_make_bools(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400344static int sel_make_classes(void);
Paul Moore3bb56b22008-01-29 08:38:19 -0500345static int sel_make_policycap(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400346
347/* declaration for sel_make_class_dirs */
348static int sel_make_dir(struct inode *dir, struct dentry *dentry,
349 unsigned long *ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351static 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
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100357 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
358 security_mls_enabled());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
360}
361
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800362static const struct file_operations sel_mls_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 .read = sel_read_mls,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200364 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365};
366
Eric Pariscee74f42010-10-13 17:50:25 -0400367struct 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 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;
411err:
412 mutex_unlock(&sel_mutex);
413
414 if (plm)
415 vfree(plm->data);
416 kfree(plm);
417 return rc;
418}
419
420static 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
434static 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);
447out:
448 mutex_unlock(&sel_mutex);
449 return ret;
450}
451
Eric Paris845ca302010-10-13 17:50:31 -0400452static 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
474static struct vm_operations_struct sel_mmap_policy_ops = {
475 .fault = sel_mmap_policy_fault,
476 .page_mkwrite = sel_mmap_policy_fault,
477};
478
479int 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
Eric Pariscee74f42010-10-13 17:50:25 -0400495static const struct file_operations sel_policy_ops = {
496 .open = sel_open_policy,
497 .read = sel_read_policy,
Eric Paris845ca302010-10-13 17:50:31 -0400498 .mmap = sel_mmap_policy,
Eric Pariscee74f42010-10-13 17:50:25 -0400499 .release = sel_release_policy,
500};
501
Eric Paris18729812008-04-17 14:15:45 -0400502static ssize_t sel_write_load(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 size_t count, loff_t *ppos)
504
505{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 ssize_t length;
507 void *data = NULL;
508
Ingo Molnarbb003072006-03-22 00:09:14 -0800509 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 length = task_has_security(current, SECURITY__LOAD_POLICY);
512 if (length)
513 goto out;
514
Eric Parisb77a4932010-11-23 11:40:08 -0500515 /* No partial writes. */
516 length = -EINVAL;
517 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Eric Parisb77a4932010-11-23 11:40:08 -0500520 length = -EFBIG;
521 if (count > 64 * 1024 * 1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500523
524 length = -ENOMEM;
525 data = vmalloc(count);
526 if (!data)
527 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
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
Eric Parisb77a4932010-11-23 11:40:08 -0500537 length = sel_make_bools();
538 if (length)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400539 goto out1;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400540
Eric Parisb77a4932010-11-23 11:40:08 -0500541 length = sel_make_classes();
542 if (length)
Paul Moore3bb56b22008-01-29 08:38:19 -0500543 goto out1;
Paul Moore3bb56b22008-01-29 08:38:19 -0500544
Eric Parisb77a4932010-11-23 11:40:08 -0500545 length = sel_make_policycap();
546 if (length)
547 goto out1;
548
549 length = count;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400550
551out1:
Steve Grubbaf601e42006-01-04 14:08:39 +0000552 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
Eric Paris4746ec52008-01-08 10:06:53 -0500553 "policy loaded auid=%u ses=%u",
554 audit_get_loginuid(current),
555 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556out:
Ingo Molnarbb003072006-03-22 00:09:14 -0800557 mutex_unlock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 vfree(data);
559 return length;
560}
561
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800562static const struct file_operations sel_load_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 .write = sel_write_load,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200564 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565};
566
Eric Paris18729812008-04-17 14:15:45 -0400567static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
Eric Parisb77a4932010-11-23 11:40:08 -0500569 char *canon = NULL;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800570 u32 sid, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 ssize_t length;
572
573 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
574 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500575 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800577 length = security_context_to_sid(buf, size, &sid);
Eric Parisb77a4932010-11-23 11:40:08 -0500578 if (length)
579 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800581 length = security_sid_to_context(sid, &canon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500582 if (length)
583 goto out;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800584
Eric Parisb77a4932010-11-23 11:40:08 -0500585 length = -ERANGE;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800586 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400587 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
588 "payload max\n", __func__, len);
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800589 goto out;
590 }
591
592 memcpy(buf, canon, len);
593 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594out:
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800595 kfree(canon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return length;
597}
598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599static 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
Eric Paris18729812008-04-17 14:15:45 -0400609static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 size_t count, loff_t *ppos)
611{
Eric Parisb77a4932010-11-23 11:40:08 -0500612 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 ssize_t length;
614 unsigned int new_value;
615
616 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
617 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500618 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Eric Parisb77a4932010-11-23 11:40:08 -0500620 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800621 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500622 goto out;
623
624 /* No partial writes. */
625 length = -EINVAL;
626 if (*ppos != 0)
627 goto out;
628
629 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400630 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500632 goto out;
633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 length = -EFAULT;
635 if (copy_from_user(page, buf, count))
636 goto out;
637
638 length = -EINVAL;
639 if (sscanf(page, "%u", &new_value) != 1)
640 goto out;
641
642 selinux_checkreqprot = new_value ? 1 : 0;
643 length = count;
644out:
645 free_page((unsigned long) page);
646 return length;
647}
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800648static const struct file_operations sel_checkreqprot_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 .read = sel_read_checkreqprot,
650 .write = sel_write_checkreqprot,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200651 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652};
653
654/*
655 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
656 */
Eric Paris18729812008-04-17 14:15:45 -0400657static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
658static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
659static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
660static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
661static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663static ssize_t (*write_op[])(struct file *, char *, size_t) = {
664 [SEL_ACCESS] = sel_write_access,
665 [SEL_CREATE] = sel_write_create,
666 [SEL_RELABEL] = sel_write_relabel,
667 [SEL_USER] = sel_write_user,
668 [SEL_MEMBER] = sel_write_member,
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800669 [SEL_CONTEXT] = sel_write_context,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670};
671
672static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
673{
Eric Paris18729812008-04-17 14:15:45 -0400674 ino_t ino = file->f_path.dentry->d_inode->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 char *data;
676 ssize_t rv;
677
Nicolas Kaiser6e20a642006-01-06 00:11:22 -0800678 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 return -EINVAL;
680
681 data = simple_transaction_get(file, buf, size);
682 if (IS_ERR(data))
683 return PTR_ERR(data);
684
Eric Paris18729812008-04-17 14:15:45 -0400685 rv = write_op[ino](file, data, size);
686 if (rv > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 simple_transaction_set(file, rv);
688 rv = size;
689 }
690 return rv;
691}
692
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800693static const struct file_operations transaction_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 .write = selinux_transaction_write,
695 .read = simple_transaction_read,
696 .release = simple_transaction_release,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200697 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698};
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
Eric Paris18729812008-04-17 14:15:45 -0400706static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707{
Eric Parisb77a4932010-11-23 11:40:08 -0500708 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 u32 ssid, tsid;
710 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 struct av_decision avd;
712 ssize_t length;
713
714 length = task_has_security(current, SECURITY__COMPUTE_AV);
715 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500716 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800719 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500721 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Eric Parisb77a4932010-11-23 11:40:08 -0500723 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800724 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if (!tcon)
726 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 length = -EINVAL;
Stephen Smalley19439d02010-01-14 17:28:10 -0500729 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500730 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800732 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500733 if (length)
734 goto out;
735
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800736 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500737 if (length)
738 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
Stephen Smalley19439d02010-01-14 17:28:10 -0500740 security_compute_av_user(ssid, tsid, tclass, &avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
742 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900743 "%x %x %x %x %u %x",
Eric Parisf1c63812009-02-12 14:50:54 -0500744 avd.allowed, 0xffffffff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 avd.auditallow, avd.auditdeny,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900746 avd.seqno, avd.flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747out:
Eric Parisb77a4932010-11-23 11:40:08 -0500748 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 kfree(scon);
750 return length;
751}
752
Eric Paris18729812008-04-17 14:15:45 -0400753static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754{
Eric Parisb77a4932010-11-23 11:40:08 -0500755 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 u32 ssid, tsid, newsid;
757 u16 tclass;
758 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500759 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 u32 len;
761
762 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
763 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500764 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800767 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500769 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Eric Parisb77a4932010-11-23 11:40:08 -0500771 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800772 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 if (!tcon)
774 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 length = -EINVAL;
777 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500778 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800780 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500781 if (length)
782 goto out;
783
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800784 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500785 if (length)
786 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Stephen Smalleyc6d3aaa2009-09-30 13:37:50 -0400788 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500789 if (length)
790 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
792 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500793 if (length)
794 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
Eric Parisb77a4932010-11-23 11:40:08 -0500796 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400798 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
799 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -0500800 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 }
802
803 memcpy(buf, newcon, len);
804 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805out:
Eric Parisb77a4932010-11-23 11:40:08 -0500806 kfree(newcon);
807 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 kfree(scon);
809 return length;
810}
811
Eric Paris18729812008-04-17 14:15:45 -0400812static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813{
Eric Parisb77a4932010-11-23 11:40:08 -0500814 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 u32 ssid, tsid, newsid;
816 u16 tclass;
817 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500818 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 u32 len;
820
821 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
822 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500823 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
825 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800826 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500828 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Eric Parisb77a4932010-11-23 11:40:08 -0500830 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800831 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 if (!tcon)
833 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 length = -EINVAL;
836 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500837 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800839 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500840 if (length)
841 goto out;
842
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800843 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500844 if (length)
845 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 length = security_change_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500848 if (length)
849 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500852 if (length)
853 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Eric Parisb77a4932010-11-23 11:40:08 -0500855 length = -ERANGE;
856 if (len > SIMPLE_TRANSACTION_LIMIT)
857 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
859 memcpy(buf, newcon, len);
860 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861out:
Eric Parisb77a4932010-11-23 11:40:08 -0500862 kfree(newcon);
863 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 kfree(scon);
865 return length;
866}
867
Eric Paris18729812008-04-17 14:15:45 -0400868static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
Eric Parisb77a4932010-11-23 11:40:08 -0500870 char *con = NULL, *user = NULL, *ptr;
871 u32 sid, *sids = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 ssize_t length;
873 char *newcon;
874 int i, rc;
875 u32 len, nsids;
876
877 length = task_has_security(current, SECURITY__COMPUTE_USER);
878 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500879 goto out;;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800882 con = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 if (!con)
Eric Parisb77a4932010-11-23 11:40:08 -0500884 goto out;;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
Eric Parisb77a4932010-11-23 11:40:08 -0500886 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800887 user = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 if (!user)
889 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
891 length = -EINVAL;
892 if (sscanf(buf, "%s %s", con, user) != 2)
Eric Parisb77a4932010-11-23 11:40:08 -0500893 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800895 length = security_context_to_sid(con, strlen(con) + 1, &sid);
Eric Parisb77a4932010-11-23 11:40:08 -0500896 if (length)
897 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 length = security_get_user_sids(sid, user, &sids, &nsids);
Eric Parisb77a4932010-11-23 11:40:08 -0500900 if (length)
901 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
903 length = sprintf(buf, "%u", nsids) + 1;
904 ptr = buf + length;
905 for (i = 0; i < nsids; i++) {
906 rc = security_sid_to_context(sids[i], &newcon, &len);
907 if (rc) {
908 length = rc;
Eric Parisb77a4932010-11-23 11:40:08 -0500909 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 }
911 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
912 kfree(newcon);
913 length = -ERANGE;
Eric Parisb77a4932010-11-23 11:40:08 -0500914 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 }
916 memcpy(ptr, newcon, len);
917 kfree(newcon);
918 ptr += len;
919 length += len;
920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921out:
Eric Parisb77a4932010-11-23 11:40:08 -0500922 kfree(sids);
923 kfree(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 kfree(con);
925 return length;
926}
927
Eric Paris18729812008-04-17 14:15:45 -0400928static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
Eric Parisb77a4932010-11-23 11:40:08 -0500930 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 u32 ssid, tsid, newsid;
932 u16 tclass;
933 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500934 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 u32 len;
936
937 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
938 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500939 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800942 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500944 goto out;;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Eric Parisb77a4932010-11-23 11:40:08 -0500946 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800947 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 if (!tcon)
949 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 length = -EINVAL;
952 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500953 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800955 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500956 if (length)
957 goto out;
958
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800959 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500960 if (length)
961 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
963 length = security_member_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500964 if (length)
965 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500968 if (length)
969 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Eric Parisb77a4932010-11-23 11:40:08 -0500971 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400973 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
974 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -0500975 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
977
978 memcpy(buf, newcon, len);
979 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980out:
Eric Parisb77a4932010-11-23 11:40:08 -0500981 kfree(newcon);
982 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 kfree(scon);
984 return length;
985}
986
987static struct inode *sel_make_inode(struct super_block *sb, int mode)
988{
989 struct inode *ret = new_inode(sb);
990
991 if (ret) {
992 ret->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
994 }
995 return ret;
996}
997
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998static ssize_t sel_read_bool(struct file *filep, char __user *buf,
999 size_t count, loff_t *ppos)
1000{
1001 char *page = NULL;
1002 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 ssize_t ret;
1004 int cur_enforcing;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001005 struct inode *inode = filep->f_path.dentry->d_inode;
1006 unsigned index = inode->i_ino & SEL_INO_MASK;
1007 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Ingo Molnarbb003072006-03-22 00:09:14 -08001009 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Eric Parisb77a4932010-11-23 11:40:08 -05001011 ret = -EINVAL;
1012 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f942007-11-26 11:12:53 -05001013 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Eric Parisb77a4932010-11-23 11:40:08 -05001015 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001016 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001017 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
Stephen Smalleyd313f942007-11-26 11:12:53 -05001020 cur_enforcing = security_get_bool_value(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 if (cur_enforcing < 0) {
1022 ret = cur_enforcing;
1023 goto out;
1024 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
Stephen Smalleyd313f942007-11-26 11:12:53 -05001026 bool_pending_values[index]);
Stephen Smalley68bdcf22006-03-22 00:09:15 -08001027 ret = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001029 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001030 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 return ret;
1032}
1033
1034static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1035 size_t count, loff_t *ppos)
1036{
1037 char *page = NULL;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001038 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 int new_value;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001040 struct inode *inode = filep->f_path.dentry->d_inode;
1041 unsigned index = inode->i_ino & SEL_INO_MASK;
1042 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
Ingo Molnarbb003072006-03-22 00:09:14 -08001044 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
1046 length = task_has_security(current, SECURITY__SETBOOL);
1047 if (length)
1048 goto out;
1049
Eric Parisb77a4932010-11-23 11:40:08 -05001050 length = -EINVAL;
1051 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f942007-11-26 11:12:53 -05001052 goto out;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001053
Eric Parisb77a4932010-11-23 11:40:08 -05001054 length = -ENOMEM;
1055 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 goto out;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001057
Eric Parisb77a4932010-11-23 11:40:08 -05001058 /* No partial writes. */
1059 length = -EINVAL;
1060 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001062
1063 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001064 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001065 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
Stephen Smalleyd313f942007-11-26 11:12:53 -05001068 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 if (copy_from_user(page, buf, count))
1070 goto out;
1071
1072 length = -EINVAL;
1073 if (sscanf(page, "%d", &new_value) != 1)
1074 goto out;
1075
1076 if (new_value)
1077 new_value = 1;
1078
Stephen Smalleyd313f942007-11-26 11:12:53 -05001079 bool_pending_values[index] = new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 length = count;
1081
1082out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001083 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001084 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 return length;
1086}
1087
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001088static const struct file_operations sel_bool_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001089 .read = sel_read_bool,
1090 .write = sel_write_bool,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001091 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092};
1093
1094static ssize_t sel_commit_bools_write(struct file *filep,
1095 const char __user *buf,
1096 size_t count, loff_t *ppos)
1097{
1098 char *page = NULL;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001099 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 int new_value;
1101
Ingo Molnarbb003072006-03-22 00:09:14 -08001102 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
1104 length = task_has_security(current, SECURITY__SETBOOL);
1105 if (length)
1106 goto out;
1107
Eric Parisb77a4932010-11-23 11:40:08 -05001108 length = -ENOMEM;
1109 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001111
1112 /* No partial writes. */
1113 length = -EINVAL;
1114 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001116
1117 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001118 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001119 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Stephen Smalleyd313f942007-11-26 11:12:53 -05001122 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 if (copy_from_user(page, buf, count))
1124 goto out;
1125
1126 length = -EINVAL;
1127 if (sscanf(page, "%d", &new_value) != 1)
1128 goto out;
1129
Eric Parisb77a4932010-11-23 11:40:08 -05001130 length = 0;
Eric Paris18729812008-04-17 14:15:45 -04001131 if (new_value && bool_pending_values)
Eric Parisb77a4932010-11-23 11:40:08 -05001132 length = security_set_bools(bool_num, bool_pending_values);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
Eric Parisb77a4932010-11-23 11:40:08 -05001134 if (!length)
1135 length = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
1137out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001138 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001139 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 return length;
1141}
1142
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001143static const struct file_operations sel_commit_bools_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001144 .write = sel_commit_bools_write,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001145 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146};
1147
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001148static void sel_remove_entries(struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
Stephen Smalley0955dc02007-11-21 09:01:36 -05001150 struct list_head *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001152 spin_lock(&de->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 node = de->d_subdirs.next;
1154 while (node != &de->d_subdirs) {
Eric Dumazet5160ee62006-01-08 01:03:32 -08001155 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001156
1157 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 list_del_init(node);
1159
1160 if (d->d_inode) {
Nick Piggindc0474b2011-01-07 17:49:43 +11001161 dget_dlock(d);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001162 spin_unlock(&de->d_lock);
1163 spin_unlock(&d->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 d_delete(d);
1165 simple_unlink(de->d_inode, d);
1166 dput(d);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001167 spin_lock(&de->d_lock);
1168 } else
1169 spin_unlock(&d->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 node = de->d_subdirs.next;
1171 }
1172
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001173 spin_unlock(&de->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174}
1175
1176#define BOOL_DIR_NAME "booleans"
1177
1178static int sel_make_bools(void)
1179{
Eric Parisb77a4932010-11-23 11:40:08 -05001180 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 ssize_t len;
1182 struct dentry *dentry = NULL;
1183 struct dentry *dir = bool_dir;
1184 struct inode *inode = NULL;
1185 struct inode_security_struct *isec;
1186 char **names = NULL, *page;
1187 int num;
1188 int *values = NULL;
1189 u32 sid;
1190
1191 /* remove any existing files */
Xiaotian Feng8007f102010-02-09 08:22:24 +11001192 for (i = 0; i < bool_num; i++)
1193 kfree(bool_pending_names[i]);
Stephen Smalleyd313f942007-11-26 11:12:53 -05001194 kfree(bool_pending_names);
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001195 kfree(bool_pending_values);
Stephen Smalleyd313f942007-11-26 11:12:53 -05001196 bool_pending_names = NULL;
Davi Arnaut20c19e42005-10-23 12:57:16 -07001197 bool_pending_values = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001199 sel_remove_entries(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200
Eric Parisb77a4932010-11-23 11:40:08 -05001201 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001202 page = (char *)get_zeroed_page(GFP_KERNEL);
1203 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -05001204 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
1206 ret = security_get_bools(&num, &names, &values);
Eric Parisb77a4932010-11-23 11:40:08 -05001207 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 goto out;
1209
1210 for (i = 0; i < num; i++) {
Eric Parisb77a4932010-11-23 11:40:08 -05001211 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 dentry = d_alloc_name(dir, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001213 if (!dentry)
1214 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215
Eric Parisb77a4932010-11-23 11:40:08 -05001216 ret = -ENOMEM;
1217 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1218 if (!inode)
1219 goto out;
1220
1221 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001223 if (len < 0)
1224 goto out;
1225
1226 ret = -ENAMETOOLONG;
1227 if (len >= PAGE_SIZE)
1228 goto out;
1229
Eric Paris18729812008-04-17 14:15:45 -04001230 isec = (struct inode_security_struct *)inode->i_security;
1231 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1232 if (ret)
Eric Parisb77a4932010-11-23 11:40:08 -05001233 goto out;
1234
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 isec->sid = sid;
1236 isec->initialized = 1;
1237 inode->i_fop = &sel_bool_ops;
James Carterbce34bc2007-04-04 16:18:50 -04001238 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 d_add(dentry, inode);
1240 }
1241 bool_num = num;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001242 bool_pending_names = names;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 bool_pending_values = values;
Eric Parisb77a4932010-11-23 11:40:08 -05001244
1245 free_page((unsigned long)page);
1246 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247out:
1248 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001249
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 if (names) {
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001251 for (i = 0; i < num; i++)
1252 kfree(names[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 kfree(names);
1254 }
Davi Arnaut20c19e42005-10-23 12:57:16 -07001255 kfree(values);
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001256 sel_remove_entries(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001257
1258 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260
1261#define NULL_FILE_NAME "null"
1262
Eric Paris18729812008-04-17 14:15:45 -04001263struct dentry *selinux_null;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
1265static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1266 size_t count, loff_t *ppos)
1267{
1268 char tmpbuf[TMPBUFLEN];
1269 ssize_t length;
1270
1271 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1272 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1273}
1274
Eric Paris18729812008-04-17 14:15:45 -04001275static ssize_t sel_write_avc_cache_threshold(struct file *file,
1276 const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 size_t count, loff_t *ppos)
1278
1279{
Eric Parisb77a4932010-11-23 11:40:08 -05001280 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 ssize_t ret;
1282 int new_value;
1283
Eric Parisb77a4932010-11-23 11:40:08 -05001284 ret = task_has_security(current, SECURITY__SETSECPARAM);
1285 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
Eric Parisb77a4932010-11-23 11:40:08 -05001288 ret = -ENOMEM;
1289 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
Eric Parisb77a4932010-11-23 11:40:08 -05001292 /* No partial writes. */
1293 ret = -EINVAL;
1294 if (*ppos != 0)
1295 goto out;
1296
1297 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001298 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001299 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Eric Parisb77a4932010-11-23 11:40:08 -05001302 ret = -EFAULT;
1303 if (copy_from_user(page, buf, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
Eric Parisb77a4932010-11-23 11:40:08 -05001306 ret = -EINVAL;
1307 if (sscanf(page, "%u", &new_value) != 1)
1308 goto out;
1309
1310 avc_cache_threshold = new_value;
1311
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 ret = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313out:
Eric Parisb77a4932010-11-23 11:40:08 -05001314 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 return ret;
1316}
1317
1318static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1319 size_t count, loff_t *ppos)
1320{
1321 char *page;
Eric Parisb77a4932010-11-23 11:40:08 -05001322 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
1324 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001325 if (!page)
1326 return -ENOMEM;
1327
1328 length = avc_get_hash_stats(page);
1329 if (length >= 0)
1330 length = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001332
1333 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334}
1335
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001336static const struct file_operations sel_avc_cache_threshold_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 .read = sel_read_avc_cache_threshold,
1338 .write = sel_write_avc_cache_threshold,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001339 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340};
1341
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001342static const struct file_operations sel_avc_hash_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 .read = sel_read_avc_hash_stats,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001344 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345};
1346
1347#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1348static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1349{
1350 int cpu;
1351
Rusty Russell4f4b6c12009-01-01 10:12:15 +10301352 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 if (!cpu_possible(cpu))
1354 continue;
1355 *idx = cpu + 1;
1356 return &per_cpu(avc_cache_stats, cpu);
1357 }
1358 return NULL;
1359}
1360
1361static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1362{
1363 loff_t n = *pos - 1;
1364
1365 if (*pos == 0)
1366 return SEQ_START_TOKEN;
1367
1368 return sel_avc_get_stat_idx(&n);
1369}
1370
1371static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1372{
1373 return sel_avc_get_stat_idx(pos);
1374}
1375
1376static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1377{
1378 struct avc_cache_stats *st = v;
1379
1380 if (v == SEQ_START_TOKEN)
1381 seq_printf(seq, "lookups hits misses allocations reclaims "
1382 "frees\n");
Linus Torvalds257313b2011-05-19 21:22:53 -07001383 else {
1384 unsigned int lookups = st->lookups;
1385 unsigned int misses = st->misses;
1386 unsigned int hits = lookups - misses;
1387 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1388 hits, misses, st->allocations,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 st->reclaims, st->frees);
Linus Torvalds257313b2011-05-19 21:22:53 -07001390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 return 0;
1392}
1393
1394static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1395{ }
1396
Jan Engelhardt1996a102008-01-23 00:02:58 +01001397static const struct seq_operations sel_avc_cache_stats_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 .start = sel_avc_stats_seq_start,
1399 .next = sel_avc_stats_seq_next,
1400 .show = sel_avc_stats_seq_show,
1401 .stop = sel_avc_stats_seq_stop,
1402};
1403
1404static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1405{
1406 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1407}
1408
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001409static const struct file_operations sel_avc_cache_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 .open = sel_open_avc_cache_stats,
1411 .read = seq_read,
1412 .llseek = seq_lseek,
1413 .release = seq_release,
1414};
1415#endif
1416
1417static int sel_make_avc_files(struct dentry *dir)
1418{
Eric Parisb77a4932010-11-23 11:40:08 -05001419 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 static struct tree_descr files[] = {
1421 { "cache_threshold",
1422 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1423 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1424#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1425 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1426#endif
1427 };
1428
Nicolas Kaiser6e20a642006-01-06 00:11:22 -08001429 for (i = 0; i < ARRAY_SIZE(files); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 struct inode *inode;
1431 struct dentry *dentry;
1432
1433 dentry = d_alloc_name(dir, files[i].name);
Eric Parisb77a4932010-11-23 11:40:08 -05001434 if (!dentry)
1435 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
Eric Parisb77a4932010-11-23 11:40:08 -05001438 if (!inode)
1439 return -ENOMEM;
1440
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 inode->i_fop = files[i].ops;
James Carter6174eaf2007-04-04 16:18:39 -04001442 inode->i_ino = ++sel_last_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 d_add(dentry, inode);
1444 }
Eric Parisb77a4932010-11-23 11:40:08 -05001445
1446 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447}
1448
Eric Paris18729812008-04-17 14:15:45 -04001449static ssize_t sel_read_initcon(struct file *file, char __user *buf,
James Carterf0ee2e42007-04-04 10:11:29 -04001450 size_t count, loff_t *ppos)
1451{
1452 struct inode *inode;
1453 char *con;
1454 u32 sid, len;
1455 ssize_t ret;
1456
1457 inode = file->f_path.dentry->d_inode;
1458 sid = inode->i_ino&SEL_INO_MASK;
1459 ret = security_sid_to_context(sid, &con, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001460 if (ret)
James Carterf0ee2e42007-04-04 10:11:29 -04001461 return ret;
1462
1463 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1464 kfree(con);
1465 return ret;
1466}
1467
1468static const struct file_operations sel_initcon_ops = {
1469 .read = sel_read_initcon,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001470 .llseek = generic_file_llseek,
James Carterf0ee2e42007-04-04 10:11:29 -04001471};
1472
1473static int sel_make_initcon_files(struct dentry *dir)
1474{
Eric Parisb77a4932010-11-23 11:40:08 -05001475 int i;
James Carterf0ee2e42007-04-04 10:11:29 -04001476
1477 for (i = 1; i <= SECINITSID_NUM; i++) {
1478 struct inode *inode;
1479 struct dentry *dentry;
1480 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
Eric Parisb77a4932010-11-23 11:40:08 -05001481 if (!dentry)
1482 return -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001483
1484 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001485 if (!inode)
1486 return -ENOMEM;
1487
James Carterf0ee2e42007-04-04 10:11:29 -04001488 inode->i_fop = &sel_initcon_ops;
1489 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1490 d_add(dentry, inode);
1491 }
Eric Parisb77a4932010-11-23 11:40:08 -05001492
1493 return 0;
James Carterf0ee2e42007-04-04 10:11:29 -04001494}
1495
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001496static inline unsigned int sel_div(unsigned long a, unsigned long b)
1497{
1498 return a / b - (a % b < 0);
1499}
1500
1501static inline unsigned long sel_class_to_ino(u16 class)
1502{
1503 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1504}
1505
1506static inline u16 sel_ino_to_class(unsigned long ino)
1507{
1508 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1509}
1510
1511static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1512{
1513 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1514}
1515
1516static inline u32 sel_ino_to_perm(unsigned long ino)
1517{
1518 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1519}
1520
Eric Paris18729812008-04-17 14:15:45 -04001521static ssize_t sel_read_class(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001522 size_t count, loff_t *ppos)
1523{
1524 ssize_t rc, len;
1525 char *page;
1526 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1527
1528 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001529 if (!page)
1530 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001531
1532 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1533 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1534 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001535
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001536 return rc;
1537}
1538
1539static const struct file_operations sel_class_ops = {
1540 .read = sel_read_class,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001541 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001542};
1543
Eric Paris18729812008-04-17 14:15:45 -04001544static ssize_t sel_read_perm(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001545 size_t count, loff_t *ppos)
1546{
1547 ssize_t rc, len;
1548 char *page;
1549 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1550
1551 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001552 if (!page)
1553 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001554
Eric Paris18729812008-04-17 14:15:45 -04001555 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001556 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1557 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001558
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001559 return rc;
1560}
1561
1562static const struct file_operations sel_perm_ops = {
1563 .read = sel_read_perm,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001564 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001565};
1566
Paul Moore3bb56b22008-01-29 08:38:19 -05001567static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1568 size_t count, loff_t *ppos)
1569{
1570 int value;
1571 char tmpbuf[TMPBUFLEN];
1572 ssize_t length;
1573 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1574
1575 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1576 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1577
1578 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1579}
1580
1581static const struct file_operations sel_policycap_ops = {
1582 .read = sel_read_policycap,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001583 .llseek = generic_file_llseek,
Paul Moore3bb56b22008-01-29 08:38:19 -05001584};
1585
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001586static int sel_make_perm_files(char *objclass, int classvalue,
1587 struct dentry *dir)
1588{
Eric Parisb77a4932010-11-23 11:40:08 -05001589 int i, rc, nperms;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001590 char **perms;
1591
1592 rc = security_get_permissions(objclass, &perms, &nperms);
1593 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001594 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001595
1596 for (i = 0; i < nperms; i++) {
1597 struct inode *inode;
1598 struct dentry *dentry;
1599
Eric Parisb77a4932010-11-23 11:40:08 -05001600 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001601 dentry = d_alloc_name(dir, perms[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001602 if (!dentry)
1603 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001604
Eric Parisb77a4932010-11-23 11:40:08 -05001605 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001606 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001607 if (!inode)
1608 goto out;
1609
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001610 inode->i_fop = &sel_perm_ops;
1611 /* i+1 since perm values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001612 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001613 d_add(dentry, inode);
1614 }
Eric Parisb77a4932010-11-23 11:40:08 -05001615 rc = 0;
1616out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001617 for (i = 0; i < nperms; i++)
1618 kfree(perms[i]);
1619 kfree(perms);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001620 return rc;
1621}
1622
1623static int sel_make_class_dir_entries(char *classname, int index,
1624 struct dentry *dir)
1625{
1626 struct dentry *dentry = NULL;
1627 struct inode *inode = NULL;
1628 int rc;
1629
1630 dentry = d_alloc_name(dir, "index");
Eric Parisb77a4932010-11-23 11:40:08 -05001631 if (!dentry)
1632 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001633
1634 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001635 if (!inode)
1636 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001637
1638 inode->i_fop = &sel_class_ops;
1639 inode->i_ino = sel_class_to_ino(index);
1640 d_add(dentry, inode);
1641
1642 dentry = d_alloc_name(dir, "perms");
Eric Parisb77a4932010-11-23 11:40:08 -05001643 if (!dentry)
1644 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001645
1646 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1647 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001648 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001649
1650 rc = sel_make_perm_files(classname, index, dentry);
1651
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001652 return rc;
1653}
1654
1655static void sel_remove_classes(void)
1656{
1657 struct list_head *class_node;
1658
1659 list_for_each(class_node, &class_dir->d_subdirs) {
1660 struct dentry *class_subdir = list_entry(class_node,
1661 struct dentry, d_u.d_child);
1662 struct list_head *class_subdir_node;
1663
1664 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1665 struct dentry *d = list_entry(class_subdir_node,
1666 struct dentry, d_u.d_child);
1667
1668 if (d->d_inode)
1669 if (d->d_inode->i_mode & S_IFDIR)
1670 sel_remove_entries(d);
1671 }
1672
1673 sel_remove_entries(class_subdir);
1674 }
1675
1676 sel_remove_entries(class_dir);
1677}
1678
1679static int sel_make_classes(void)
1680{
Eric Parisb77a4932010-11-23 11:40:08 -05001681 int rc, nclasses, i;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001682 char **classes;
1683
1684 /* delete any existing entries */
1685 sel_remove_classes();
1686
1687 rc = security_get_classes(&classes, &nclasses);
Eric Parisb77a4932010-11-23 11:40:08 -05001688 if (rc)
1689 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001690
1691 /* +2 since classes are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001692 last_class_ino = sel_class_to_ino(nclasses + 2);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001693
1694 for (i = 0; i < nclasses; i++) {
1695 struct dentry *class_name_dir;
1696
Eric Parisb77a4932010-11-23 11:40:08 -05001697 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001698 class_name_dir = d_alloc_name(class_dir, classes[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001699 if (!class_name_dir)
1700 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001701
1702 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1703 &last_class_ino);
1704 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001705 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001706
1707 /* i+1 since class values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001708 rc = sel_make_class_dir_entries(classes[i], i + 1,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001709 class_name_dir);
1710 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001711 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001712 }
Eric Parisb77a4932010-11-23 11:40:08 -05001713 rc = 0;
1714out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001715 for (i = 0; i < nclasses; i++)
1716 kfree(classes[i]);
1717 kfree(classes);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001718 return rc;
1719}
1720
Paul Moore3bb56b22008-01-29 08:38:19 -05001721static int sel_make_policycap(void)
1722{
1723 unsigned int iter;
1724 struct dentry *dentry = NULL;
1725 struct inode *inode = NULL;
1726
1727 sel_remove_entries(policycap_dir);
1728
1729 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1730 if (iter < ARRAY_SIZE(policycap_names))
1731 dentry = d_alloc_name(policycap_dir,
1732 policycap_names[iter]);
1733 else
1734 dentry = d_alloc_name(policycap_dir, "unknown");
1735
1736 if (dentry == NULL)
1737 return -ENOMEM;
1738
1739 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1740 if (inode == NULL)
1741 return -ENOMEM;
1742
1743 inode->i_fop = &sel_policycap_ops;
1744 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1745 d_add(dentry, inode);
1746 }
1747
1748 return 0;
1749}
1750
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001751static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1752 unsigned long *ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 struct inode *inode;
1755
James Morrisedb20fb2006-03-22 00:09:20 -08001756 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001757 if (!inode)
1758 return -ENOMEM;
1759
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 inode->i_op = &simple_dir_inode_operations;
1761 inode->i_fop = &simple_dir_operations;
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001762 inode->i_ino = ++(*ino);
James Morris40e906f2006-03-22 00:09:16 -08001763 /* directory inodes start off with i_nlink == 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -07001764 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 d_add(dentry, inode);
James Morrisedb20fb2006-03-22 00:09:20 -08001766 /* bump link count on parent directory, too */
Dave Hansend8c76e62006-09-30 23:29:04 -07001767 inc_nlink(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001768
1769 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770}
1771
Eric Paris18729812008-04-17 14:15:45 -04001772static int sel_fill_super(struct super_block *sb, void *data, int silent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773{
1774 int ret;
1775 struct dentry *dentry;
James Morrisedb20fb2006-03-22 00:09:20 -08001776 struct inode *inode, *root_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 struct inode_security_struct *isec;
1778
1779 static struct tree_descr selinux_files[] = {
1780 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1781 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
Stephen Smalleyce9982d2005-11-08 21:34:33 -08001782 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1784 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1785 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1786 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1787 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1788 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1789 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1790 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1791 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1792 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
Eric Paris3f120702007-09-21 14:37:10 -04001793 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1794 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
KaiGai Kohei11904162010-09-14 18:28:39 +09001795 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
Eric Pariscee74f42010-10-13 17:50:25 -04001796 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 /* last one */ {""}
1798 };
1799 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1800 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001801 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
James Morrisedb20fb2006-03-22 00:09:20 -08001803 root_inode = sb->s_root->d_inode;
1804
Eric Parisb77a4932010-11-23 11:40:08 -05001805 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001806 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001807 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001808 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001810 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
James Morriscde174a2006-03-22 00:09:17 -08001811 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001812 goto err;
James Morriscde174a2006-03-22 00:09:17 -08001813
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814 bool_dir = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815
Eric Parisb77a4932010-11-23 11:40:08 -05001816 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001818 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001819 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820
Eric Parisb77a4932010-11-23 11:40:08 -05001821 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001823 if (!inode)
James Morris161ce452006-03-22 00:09:17 -08001824 goto err;
Eric Parisb77a4932010-11-23 11:40:08 -05001825
James Carter6174eaf2007-04-04 16:18:39 -04001826 inode->i_ino = ++sel_last_ino;
Eric Paris18729812008-04-17 14:15:45 -04001827 isec = (struct inode_security_struct *)inode->i_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 isec->sid = SECINITSID_DEVNULL;
1829 isec->sclass = SECCLASS_CHR_FILE;
1830 isec->initialized = 1;
1831
1832 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1833 d_add(dentry, inode);
1834 selinux_null = dentry;
1835
Eric Parisb77a4932010-11-23 11:40:08 -05001836 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837 dentry = d_alloc_name(sb->s_root, "avc");
Eric Parisb77a4932010-11-23 11:40:08 -05001838 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001839 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001841 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001843 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844
1845 ret = sel_make_avc_files(dentry);
1846 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001847 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001848
Eric Parisb77a4932010-11-23 11:40:08 -05001849 ret = -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001850 dentry = d_alloc_name(sb->s_root, "initial_contexts");
Eric Parisb77a4932010-11-23 11:40:08 -05001851 if (!dentry)
James Carterf0ee2e42007-04-04 10:11:29 -04001852 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001853
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001854 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
James Carterf0ee2e42007-04-04 10:11:29 -04001855 if (ret)
1856 goto err;
1857
1858 ret = sel_make_initcon_files(dentry);
1859 if (ret)
1860 goto err;
1861
Eric Parisb77a4932010-11-23 11:40:08 -05001862 ret = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001863 dentry = d_alloc_name(sb->s_root, "class");
Eric Parisb77a4932010-11-23 11:40:08 -05001864 if (!dentry)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001865 goto err;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001866
1867 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1868 if (ret)
1869 goto err;
1870
1871 class_dir = dentry;
1872
Eric Parisb77a4932010-11-23 11:40:08 -05001873 ret = -ENOMEM;
Paul Moore3bb56b22008-01-29 08:38:19 -05001874 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
Eric Parisb77a4932010-11-23 11:40:08 -05001875 if (!dentry)
Paul Moore3bb56b22008-01-29 08:38:19 -05001876 goto err;
Paul Moore3bb56b22008-01-29 08:38:19 -05001877
1878 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1879 if (ret)
1880 goto err;
1881
1882 policycap_dir = dentry;
1883
Eric Parisb77a4932010-11-23 11:40:08 -05001884 return 0;
James Morris161ce452006-03-22 00:09:17 -08001885err:
Eric Paris744ba352008-04-17 11:52:44 -04001886 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1887 __func__);
Eric Parisb77a4932010-11-23 11:40:08 -05001888 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889}
1890
Al Virofc14f2f2010-07-25 01:48:30 +04001891static struct dentry *sel_mount(struct file_system_type *fs_type,
1892 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893{
Al Virofc14f2f2010-07-25 01:48:30 +04001894 return mount_single(fs_type, flags, data, sel_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895}
1896
1897static struct file_system_type sel_fs_type = {
1898 .name = "selinuxfs",
Al Virofc14f2f2010-07-25 01:48:30 +04001899 .mount = sel_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 .kill_sb = kill_litter_super,
1901};
1902
1903struct vfsmount *selinuxfs_mount;
1904
1905static int __init init_sel_fs(void)
1906{
1907 int err;
1908
1909 if (!selinux_enabled)
1910 return 0;
1911 err = register_filesystem(&sel_fs_type);
Eric Parisb77a4932010-11-23 11:40:08 -05001912 if (err)
1913 return err;
1914
1915 selinuxfs_mount = kern_mount(&sel_fs_type);
1916 if (IS_ERR(selinuxfs_mount)) {
1917 printk(KERN_ERR "selinuxfs: could not mount!\n");
1918 err = PTR_ERR(selinuxfs_mount);
1919 selinuxfs_mount = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 }
Eric Parisb77a4932010-11-23 11:40:08 -05001921
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922 return err;
1923}
1924
1925__initcall(init_sel_fs);
1926
1927#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1928void exit_sel_fs(void)
1929{
1930 unregister_filesystem(&sel_fs_type);
1931}
1932#endif