blob: 48a7d0014b4f4f5c4f40d92de9cb029bdf149d45 [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 Moore82c21bf2011-08-01 11:10:33 +00005 * Updated: Hewlett-Packard <paul@paul-moore.com>
Paul Moore3bb56b22008-01-29 08:38:19 -05006 *
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>
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -070031#include <linux/kobject.h>
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -040032#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34/* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37#include "flask.h"
38#include "avc.h"
39#include "avc_ss.h"
40#include "security.h"
41#include "objsec.h"
42#include "conditional.h"
43
Paul Moore3bb56b22008-01-29 08:38:19 -050044/* Policy capability filenames */
45static char *policycap_names[] = {
Eric Parisb0c636b2008-02-28 12:58:40 -050046 "network_peer_controls",
47 "open_perms"
Paul Moore3bb56b22008-01-29 08:38:19 -050048};
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
51
52static int __init checkreqprot_setup(char *str)
53{
Eric Parisf5269712008-05-14 11:27:45 -040054 unsigned long checkreqprot;
55 if (!strict_strtoul(str, 0, &checkreqprot))
56 selinux_checkreqprot = checkreqprot ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 return 1;
58}
59__setup("checkreqprot=", checkreqprot_setup);
60
Ingo Molnarbb003072006-03-22 00:09:14 -080061static DEFINE_MUTEX(sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63/* global data for booleans */
Eric Paris18729812008-04-17 14:15:45 -040064static struct dentry *bool_dir;
65static int bool_num;
Stephen Smalleyd313f942007-11-26 11:12:53 -050066static char **bool_pending_names;
Eric Paris18729812008-04-17 14:15:45 -040067static int *bool_pending_values;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040069/* global data for classes */
Eric Paris18729812008-04-17 14:15:45 -040070static struct dentry *class_dir;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040071static unsigned long last_class_ino;
72
Eric Pariscee74f42010-10-13 17:50:25 -040073static char policy_opened;
74
Paul Moore3bb56b22008-01-29 08:38:19 -050075/* global data for policy capabilities */
Eric Paris18729812008-04-17 14:15:45 -040076static struct dentry *policycap_dir;
Paul Moore3bb56b22008-01-29 08:38:19 -050077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/* 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Eric Parisb77a4932010-11-23 11:40:08 -0500280 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800281 if (count >= PAGE_SIZE)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700282 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500283
284 /* No partial writes. */
285 length = -EINVAL;
286 if (*ppos != 0)
287 goto out;
288
289 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400290 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500292 goto out;
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 length = -EFAULT;
295 if (copy_from_user(page, buf, count))
296 goto out;
297
298 length = -EINVAL;
299 if (sscanf(page, "%d", &new_value) != 1)
300 goto out;
301
302 if (new_value) {
303 length = selinux_disable();
Eric Parisb77a4932010-11-23 11:40:08 -0500304 if (length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000306 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500307 "selinux=0 auid=%u ses=%u",
308 audit_get_loginuid(current),
309 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 }
311
312 length = count;
313out:
314 free_page((unsigned long) page);
315 return length;
316}
317#else
318#define sel_write_disable NULL
319#endif
320
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800321static const struct file_operations sel_disable_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 .write = sel_write_disable,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200323 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324};
325
326static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
Eric Paris18729812008-04-17 14:15:45 -0400327 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 char tmpbuf[TMPBUFLEN];
330 ssize_t length;
331
332 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
333 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
334}
335
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800336static const struct file_operations sel_policyvers_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 .read = sel_read_policyvers,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200338 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339};
340
341/* declaration for sel_write_load */
342static int sel_make_bools(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400343static int sel_make_classes(void);
Paul Moore3bb56b22008-01-29 08:38:19 -0500344static int sel_make_policycap(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400345
346/* declaration for sel_make_class_dirs */
347static int sel_make_dir(struct inode *dir, struct dentry *dentry,
348 unsigned long *ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350static ssize_t sel_read_mls(struct file *filp, char __user *buf,
351 size_t count, loff_t *ppos)
352{
353 char tmpbuf[TMPBUFLEN];
354 ssize_t length;
355
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100356 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
357 security_mls_enabled());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
359}
360
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800361static const struct file_operations sel_mls_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 .read = sel_read_mls,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200363 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364};
365
Eric Pariscee74f42010-10-13 17:50:25 -0400366struct policy_load_memory {
367 size_t len;
368 void *data;
369};
370
371static int sel_open_policy(struct inode *inode, struct file *filp)
372{
373 struct policy_load_memory *plm = NULL;
374 int rc;
375
376 BUG_ON(filp->private_data);
377
378 mutex_lock(&sel_mutex);
379
380 rc = task_has_security(current, SECURITY__READ_POLICY);
381 if (rc)
382 goto err;
383
384 rc = -EBUSY;
385 if (policy_opened)
386 goto err;
387
388 rc = -ENOMEM;
389 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
390 if (!plm)
391 goto err;
392
393 if (i_size_read(inode) != security_policydb_len()) {
394 mutex_lock(&inode->i_mutex);
395 i_size_write(inode, security_policydb_len());
396 mutex_unlock(&inode->i_mutex);
397 }
398
399 rc = security_read_policy(&plm->data, &plm->len);
400 if (rc)
401 goto err;
402
403 policy_opened = 1;
404
405 filp->private_data = plm;
406
407 mutex_unlock(&sel_mutex);
408
409 return 0;
410err:
411 mutex_unlock(&sel_mutex);
412
413 if (plm)
414 vfree(plm->data);
415 kfree(plm);
416 return rc;
417}
418
419static int sel_release_policy(struct inode *inode, struct file *filp)
420{
421 struct policy_load_memory *plm = filp->private_data;
422
423 BUG_ON(!plm);
424
425 policy_opened = 0;
426
427 vfree(plm->data);
428 kfree(plm);
429
430 return 0;
431}
432
433static ssize_t sel_read_policy(struct file *filp, char __user *buf,
434 size_t count, loff_t *ppos)
435{
436 struct policy_load_memory *plm = filp->private_data;
437 int ret;
438
439 mutex_lock(&sel_mutex);
440
441 ret = task_has_security(current, SECURITY__READ_POLICY);
442 if (ret)
443 goto out;
444
445 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
446out:
447 mutex_unlock(&sel_mutex);
448 return ret;
449}
450
Eric Paris845ca302010-10-13 17:50:31 -0400451static int sel_mmap_policy_fault(struct vm_area_struct *vma,
452 struct vm_fault *vmf)
453{
454 struct policy_load_memory *plm = vma->vm_file->private_data;
455 unsigned long offset;
456 struct page *page;
457
458 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
459 return VM_FAULT_SIGBUS;
460
461 offset = vmf->pgoff << PAGE_SHIFT;
462 if (offset >= roundup(plm->len, PAGE_SIZE))
463 return VM_FAULT_SIGBUS;
464
465 page = vmalloc_to_page(plm->data + offset);
466 get_page(page);
467
468 vmf->page = page;
469
470 return 0;
471}
472
473static struct vm_operations_struct sel_mmap_policy_ops = {
474 .fault = sel_mmap_policy_fault,
475 .page_mkwrite = sel_mmap_policy_fault,
476};
477
James Morrisad3fa082011-08-30 10:50:12 +1000478static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
Eric Paris845ca302010-10-13 17:50:31 -0400479{
480 if (vma->vm_flags & VM_SHARED) {
481 /* do not allow mprotect to make mapping writable */
482 vma->vm_flags &= ~VM_MAYWRITE;
483
484 if (vma->vm_flags & VM_WRITE)
485 return -EACCES;
486 }
487
488 vma->vm_flags |= VM_RESERVED;
489 vma->vm_ops = &sel_mmap_policy_ops;
490
491 return 0;
492}
493
Eric Pariscee74f42010-10-13 17:50:25 -0400494static const struct file_operations sel_policy_ops = {
495 .open = sel_open_policy,
496 .read = sel_read_policy,
Eric Paris845ca302010-10-13 17:50:31 -0400497 .mmap = sel_mmap_policy,
Eric Pariscee74f42010-10-13 17:50:25 -0400498 .release = sel_release_policy,
499};
500
Eric Paris18729812008-04-17 14:15:45 -0400501static ssize_t sel_write_load(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 size_t count, loff_t *ppos)
503
504{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 ssize_t length;
506 void *data = NULL;
507
Ingo Molnarbb003072006-03-22 00:09:14 -0800508 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 length = task_has_security(current, SECURITY__LOAD_POLICY);
511 if (length)
512 goto out;
513
Eric Parisb77a4932010-11-23 11:40:08 -0500514 /* No partial writes. */
515 length = -EINVAL;
516 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
Eric Parisb77a4932010-11-23 11:40:08 -0500519 length = -EFBIG;
520 if (count > 64 * 1024 * 1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500522
523 length = -ENOMEM;
524 data = vmalloc(count);
525 if (!data)
526 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
528 length = -EFAULT;
529 if (copy_from_user(data, buf, count) != 0)
530 goto out;
531
532 length = security_load_policy(data, count);
533 if (length)
534 goto out;
535
Eric Parisb77a4932010-11-23 11:40:08 -0500536 length = sel_make_bools();
537 if (length)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400538 goto out1;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400539
Eric Parisb77a4932010-11-23 11:40:08 -0500540 length = sel_make_classes();
541 if (length)
Paul Moore3bb56b22008-01-29 08:38:19 -0500542 goto out1;
Paul Moore3bb56b22008-01-29 08:38:19 -0500543
Eric Parisb77a4932010-11-23 11:40:08 -0500544 length = sel_make_policycap();
545 if (length)
546 goto out1;
547
548 length = count;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400549
550out1:
Steve Grubbaf601e42006-01-04 14:08:39 +0000551 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
Eric Paris4746ec52008-01-08 10:06:53 -0500552 "policy loaded auid=%u ses=%u",
553 audit_get_loginuid(current),
554 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555out:
Ingo Molnarbb003072006-03-22 00:09:14 -0800556 mutex_unlock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 vfree(data);
558 return length;
559}
560
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800561static const struct file_operations sel_load_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 .write = sel_write_load,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200563 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564};
565
Eric Paris18729812008-04-17 14:15:45 -0400566static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
Eric Parisb77a4932010-11-23 11:40:08 -0500568 char *canon = NULL;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800569 u32 sid, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 ssize_t length;
571
572 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
573 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500574 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800576 length = security_context_to_sid(buf, size, &sid);
Eric Parisb77a4932010-11-23 11:40:08 -0500577 if (length)
578 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800580 length = security_sid_to_context(sid, &canon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500581 if (length)
582 goto out;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800583
Eric Parisb77a4932010-11-23 11:40:08 -0500584 length = -ERANGE;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800585 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400586 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
587 "payload max\n", __func__, len);
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800588 goto out;
589 }
590
591 memcpy(buf, canon, len);
592 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593out:
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800594 kfree(canon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 return length;
596}
597
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
599 size_t count, loff_t *ppos)
600{
601 char tmpbuf[TMPBUFLEN];
602 ssize_t length;
603
604 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
605 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
606}
607
Eric Paris18729812008-04-17 14:15:45 -0400608static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 size_t count, loff_t *ppos)
610{
Eric Parisb77a4932010-11-23 11:40:08 -0500611 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 ssize_t length;
613 unsigned int new_value;
614
615 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
616 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500617 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Eric Parisb77a4932010-11-23 11:40:08 -0500619 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800620 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500621 goto out;
622
623 /* No partial writes. */
624 length = -EINVAL;
625 if (*ppos != 0)
626 goto out;
627
628 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400629 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500631 goto out;
632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 length = -EFAULT;
634 if (copy_from_user(page, buf, count))
635 goto out;
636
637 length = -EINVAL;
638 if (sscanf(page, "%u", &new_value) != 1)
639 goto out;
640
641 selinux_checkreqprot = new_value ? 1 : 0;
642 length = count;
643out:
644 free_page((unsigned long) page);
645 return length;
646}
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800647static const struct file_operations sel_checkreqprot_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 .read = sel_read_checkreqprot,
649 .write = sel_write_checkreqprot,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200650 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651};
652
653/*
654 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
655 */
Eric Paris18729812008-04-17 14:15:45 -0400656static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
657static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
658static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
659static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
660static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662static ssize_t (*write_op[])(struct file *, char *, size_t) = {
663 [SEL_ACCESS] = sel_write_access,
664 [SEL_CREATE] = sel_write_create,
665 [SEL_RELABEL] = sel_write_relabel,
666 [SEL_USER] = sel_write_user,
667 [SEL_MEMBER] = sel_write_member,
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800668 [SEL_CONTEXT] = sel_write_context,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669};
670
671static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
672{
Eric Paris18729812008-04-17 14:15:45 -0400673 ino_t ino = file->f_path.dentry->d_inode->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 char *data;
675 ssize_t rv;
676
Nicolas Kaiser6e20a642006-01-06 00:11:22 -0800677 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 return -EINVAL;
679
680 data = simple_transaction_get(file, buf, size);
681 if (IS_ERR(data))
682 return PTR_ERR(data);
683
Eric Paris18729812008-04-17 14:15:45 -0400684 rv = write_op[ino](file, data, size);
685 if (rv > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 simple_transaction_set(file, rv);
687 rv = size;
688 }
689 return rv;
690}
691
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800692static const struct file_operations transaction_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 .write = selinux_transaction_write,
694 .read = simple_transaction_read,
695 .release = simple_transaction_release,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200696 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697};
698
699/*
700 * payload - write methods
701 * If the method has a response, the response should be put in buf,
702 * and the length returned. Otherwise return 0 or and -error.
703 */
704
Eric Paris18729812008-04-17 14:15:45 -0400705static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
Eric Parisb77a4932010-11-23 11:40:08 -0500707 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 u32 ssid, tsid;
709 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct av_decision avd;
711 ssize_t length;
712
713 length = task_has_security(current, SECURITY__COMPUTE_AV);
714 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500715 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
717 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800718 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500720 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Eric Parisb77a4932010-11-23 11:40:08 -0500722 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800723 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 if (!tcon)
725 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
727 length = -EINVAL;
Stephen Smalley19439d02010-01-14 17:28:10 -0500728 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500729 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800731 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500732 if (length)
733 goto out;
734
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800735 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500736 if (length)
737 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Stephen Smalley19439d02010-01-14 17:28:10 -0500739 security_compute_av_user(ssid, tsid, tclass, &avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
741 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900742 "%x %x %x %x %u %x",
Eric Parisf1c63812009-02-12 14:50:54 -0500743 avd.allowed, 0xffffffff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 avd.auditallow, avd.auditdeny,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900745 avd.seqno, avd.flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746out:
Eric Parisb77a4932010-11-23 11:40:08 -0500747 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 kfree(scon);
749 return length;
750}
751
Eric Paris18729812008-04-17 14:15:45 -0400752static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
Eric Parisb77a4932010-11-23 11:40:08 -0500754 char *scon = NULL, *tcon = NULL;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100755 char *namebuf = NULL, *objname = 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;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100761 int nargs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
763 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
764 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500765 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
767 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800768 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500770 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Eric Parisb77a4932010-11-23 11:40:08 -0500772 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800773 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (!tcon)
775 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100777 length = -ENOMEM;
778 namebuf = kzalloc(size + 1, GFP_KERNEL);
779 if (!namebuf)
Eric Parisb77a4932010-11-23 11:40:08 -0500780 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100782 length = -EINVAL;
783 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
784 if (nargs < 3 || nargs > 4)
785 goto out;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400786 if (nargs == 4) {
787 /*
788 * If and when the name of new object to be queried contains
789 * either whitespace or multibyte characters, they shall be
790 * encoded based on the percentage-encoding rule.
791 * If not encoded, the sscanf logic picks up only left-half
792 * of the supplied name; splitted by a whitespace unexpectedly.
793 */
794 char *r, *w;
795 int c1, c2;
796
797 r = w = namebuf;
798 do {
799 c1 = *r++;
800 if (c1 == '+')
801 c1 = ' ';
802 else if (c1 == '%') {
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800803 c1 = hex_to_bin(*r++);
804 if (c1 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400805 goto out;
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800806 c2 = hex_to_bin(*r++);
807 if (c2 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400808 goto out;
809 c1 = (c1 << 4) | c2;
810 }
811 *w++ = c1;
812 } while (c1 != '\0');
813
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100814 objname = namebuf;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400815 }
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100816
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800817 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500818 if (length)
819 goto out;
820
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800821 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500822 if (length)
823 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100825 length = security_transition_sid_user(ssid, tsid, tclass,
826 objname, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500827 if (length)
828 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500831 if (length)
832 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
Eric Parisb77a4932010-11-23 11:40:08 -0500834 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400836 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
837 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -0500838 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 }
840
841 memcpy(buf, newcon, len);
842 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843out:
Eric Parisb77a4932010-11-23 11:40:08 -0500844 kfree(newcon);
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100845 kfree(namebuf);
Eric Parisb77a4932010-11-23 11:40:08 -0500846 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 kfree(scon);
848 return length;
849}
850
Eric Paris18729812008-04-17 14:15:45 -0400851static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852{
Eric Parisb77a4932010-11-23 11:40:08 -0500853 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 u32 ssid, tsid, newsid;
855 u16 tclass;
856 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500857 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 u32 len;
859
860 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
861 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500862 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800865 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500867 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Eric Parisb77a4932010-11-23 11:40:08 -0500869 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800870 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 if (!tcon)
872 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 length = -EINVAL;
875 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500876 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800878 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500879 if (length)
880 goto out;
881
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800882 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500883 if (length)
884 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
886 length = security_change_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500887 if (length)
888 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500891 if (length)
892 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Eric Parisb77a4932010-11-23 11:40:08 -0500894 length = -ERANGE;
895 if (len > SIMPLE_TRANSACTION_LIMIT)
896 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898 memcpy(buf, newcon, len);
899 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900out:
Eric Parisb77a4932010-11-23 11:40:08 -0500901 kfree(newcon);
902 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 kfree(scon);
904 return length;
905}
906
Eric Paris18729812008-04-17 14:15:45 -0400907static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908{
Eric Parisb77a4932010-11-23 11:40:08 -0500909 char *con = NULL, *user = NULL, *ptr;
910 u32 sid, *sids = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 ssize_t length;
912 char *newcon;
913 int i, rc;
914 u32 len, nsids;
915
916 length = task_has_security(current, SECURITY__COMPUTE_USER);
917 if (length)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700918 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
920 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800921 con = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 if (!con)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700923 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
Eric Parisb77a4932010-11-23 11:40:08 -0500925 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800926 user = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 if (!user)
928 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
930 length = -EINVAL;
931 if (sscanf(buf, "%s %s", con, user) != 2)
Eric Parisb77a4932010-11-23 11:40:08 -0500932 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800934 length = security_context_to_sid(con, strlen(con) + 1, &sid);
Eric Parisb77a4932010-11-23 11:40:08 -0500935 if (length)
936 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
938 length = security_get_user_sids(sid, user, &sids, &nsids);
Eric Parisb77a4932010-11-23 11:40:08 -0500939 if (length)
940 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942 length = sprintf(buf, "%u", nsids) + 1;
943 ptr = buf + length;
944 for (i = 0; i < nsids; i++) {
945 rc = security_sid_to_context(sids[i], &newcon, &len);
946 if (rc) {
947 length = rc;
Eric Parisb77a4932010-11-23 11:40:08 -0500948 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 }
950 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
951 kfree(newcon);
952 length = -ERANGE;
Eric Parisb77a4932010-11-23 11:40:08 -0500953 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 }
955 memcpy(ptr, newcon, len);
956 kfree(newcon);
957 ptr += len;
958 length += len;
959 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960out:
Eric Parisb77a4932010-11-23 11:40:08 -0500961 kfree(sids);
962 kfree(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 kfree(con);
964 return length;
965}
966
Eric Paris18729812008-04-17 14:15:45 -0400967static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968{
Eric Parisb77a4932010-11-23 11:40:08 -0500969 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 u32 ssid, tsid, newsid;
971 u16 tclass;
972 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500973 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 u32 len;
975
976 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
977 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500978 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
980 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800981 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 if (!scon)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700983 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Eric Parisb77a4932010-11-23 11:40:08 -0500985 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800986 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 if (!tcon)
988 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990 length = -EINVAL;
991 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500992 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800994 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
Eric Parisb77a4932010-11-23 11:40:08 -0500995 if (length)
996 goto out;
997
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800998 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500999 if (length)
1000 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 length = security_member_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -05001003 if (length)
1004 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005
1006 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001007 if (length)
1008 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009
Eric Parisb77a4932010-11-23 11:40:08 -05001010 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -04001012 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1013 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -05001014 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 }
1016
1017 memcpy(buf, newcon, len);
1018 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019out:
Eric Parisb77a4932010-11-23 11:40:08 -05001020 kfree(newcon);
1021 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 kfree(scon);
1023 return length;
1024}
1025
1026static struct inode *sel_make_inode(struct super_block *sb, int mode)
1027{
1028 struct inode *ret = new_inode(sb);
1029
1030 if (ret) {
1031 ret->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1033 }
1034 return ret;
1035}
1036
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1038 size_t count, loff_t *ppos)
1039{
1040 char *page = NULL;
1041 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 ssize_t ret;
1043 int cur_enforcing;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001044 struct inode *inode = filep->f_path.dentry->d_inode;
1045 unsigned index = inode->i_ino & SEL_INO_MASK;
1046 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
Ingo Molnarbb003072006-03-22 00:09:14 -08001048 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Eric Parisb77a4932010-11-23 11:40:08 -05001050 ret = -EINVAL;
1051 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f942007-11-26 11:12:53 -05001052 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
Eric Parisb77a4932010-11-23 11:40:08 -05001054 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001055 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001056 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
Stephen Smalleyd313f942007-11-26 11:12:53 -05001059 cur_enforcing = security_get_bool_value(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 if (cur_enforcing < 0) {
1061 ret = cur_enforcing;
1062 goto out;
1063 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
Stephen Smalleyd313f942007-11-26 11:12:53 -05001065 bool_pending_values[index]);
Stephen Smalley68bdcf22006-03-22 00:09:15 -08001066 ret = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001068 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001069 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 return ret;
1071}
1072
1073static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1074 size_t count, loff_t *ppos)
1075{
1076 char *page = NULL;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001077 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 int new_value;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001079 struct inode *inode = filep->f_path.dentry->d_inode;
1080 unsigned index = inode->i_ino & SEL_INO_MASK;
1081 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082
Ingo Molnarbb003072006-03-22 00:09:14 -08001083 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084
1085 length = task_has_security(current, SECURITY__SETBOOL);
1086 if (length)
1087 goto out;
1088
Eric Parisb77a4932010-11-23 11:40:08 -05001089 length = -EINVAL;
1090 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f942007-11-26 11:12:53 -05001091 goto out;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001092
Eric Parisb77a4932010-11-23 11:40:08 -05001093 length = -ENOMEM;
1094 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 goto out;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001096
Eric Parisb77a4932010-11-23 11:40:08 -05001097 /* No partial writes. */
1098 length = -EINVAL;
1099 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001101
1102 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001103 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001104 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
Stephen Smalleyd313f942007-11-26 11:12:53 -05001107 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 if (copy_from_user(page, buf, count))
1109 goto out;
1110
1111 length = -EINVAL;
1112 if (sscanf(page, "%d", &new_value) != 1)
1113 goto out;
1114
1115 if (new_value)
1116 new_value = 1;
1117
Stephen Smalleyd313f942007-11-26 11:12:53 -05001118 bool_pending_values[index] = new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 length = count;
1120
1121out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001122 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001123 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 return length;
1125}
1126
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001127static const struct file_operations sel_bool_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001128 .read = sel_read_bool,
1129 .write = sel_write_bool,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001130 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131};
1132
1133static ssize_t sel_commit_bools_write(struct file *filep,
1134 const char __user *buf,
1135 size_t count, loff_t *ppos)
1136{
1137 char *page = NULL;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001138 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 int new_value;
1140
Ingo Molnarbb003072006-03-22 00:09:14 -08001141 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
1143 length = task_has_security(current, SECURITY__SETBOOL);
1144 if (length)
1145 goto out;
1146
Eric Parisb77a4932010-11-23 11:40:08 -05001147 length = -ENOMEM;
1148 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001150
1151 /* No partial writes. */
1152 length = -EINVAL;
1153 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001155
1156 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001157 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001158 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160
Stephen Smalleyd313f942007-11-26 11:12:53 -05001161 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 if (copy_from_user(page, buf, count))
1163 goto out;
1164
1165 length = -EINVAL;
1166 if (sscanf(page, "%d", &new_value) != 1)
1167 goto out;
1168
Eric Parisb77a4932010-11-23 11:40:08 -05001169 length = 0;
Eric Paris18729812008-04-17 14:15:45 -04001170 if (new_value && bool_pending_values)
Eric Parisb77a4932010-11-23 11:40:08 -05001171 length = security_set_bools(bool_num, bool_pending_values);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Eric Parisb77a4932010-11-23 11:40:08 -05001173 if (!length)
1174 length = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
1176out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001177 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001178 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 return length;
1180}
1181
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001182static const struct file_operations sel_commit_bools_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001183 .write = sel_commit_bools_write,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001184 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185};
1186
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001187static void sel_remove_entries(struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
Stephen Smalley0955dc02007-11-21 09:01:36 -05001189 struct list_head *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001191 spin_lock(&de->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 node = de->d_subdirs.next;
1193 while (node != &de->d_subdirs) {
Eric Dumazet5160ee62006-01-08 01:03:32 -08001194 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001195
1196 spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 list_del_init(node);
1198
1199 if (d->d_inode) {
Nick Piggindc0474b2011-01-07 17:49:43 +11001200 dget_dlock(d);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001201 spin_unlock(&de->d_lock);
1202 spin_unlock(&d->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 d_delete(d);
1204 simple_unlink(de->d_inode, d);
1205 dput(d);
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001206 spin_lock(&de->d_lock);
1207 } else
1208 spin_unlock(&d->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 node = de->d_subdirs.next;
1210 }
1211
Nick Piggin2fd6b7f2011-01-07 17:49:34 +11001212 spin_unlock(&de->d_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213}
1214
1215#define BOOL_DIR_NAME "booleans"
1216
1217static int sel_make_bools(void)
1218{
Eric Parisb77a4932010-11-23 11:40:08 -05001219 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 ssize_t len;
1221 struct dentry *dentry = NULL;
1222 struct dentry *dir = bool_dir;
1223 struct inode *inode = NULL;
1224 struct inode_security_struct *isec;
1225 char **names = NULL, *page;
1226 int num;
1227 int *values = NULL;
1228 u32 sid;
1229
1230 /* remove any existing files */
Xiaotian Feng8007f102010-02-09 08:22:24 +11001231 for (i = 0; i < bool_num; i++)
1232 kfree(bool_pending_names[i]);
Stephen Smalleyd313f942007-11-26 11:12:53 -05001233 kfree(bool_pending_names);
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001234 kfree(bool_pending_values);
Stephen Smalleyd313f942007-11-26 11:12:53 -05001235 bool_pending_names = NULL;
Davi Arnaut20c19e42005-10-23 12:57:16 -07001236 bool_pending_values = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001238 sel_remove_entries(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
Eric Parisb77a4932010-11-23 11:40:08 -05001240 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001241 page = (char *)get_zeroed_page(GFP_KERNEL);
1242 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -05001243 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
1245 ret = security_get_bools(&num, &names, &values);
Eric Parisb77a4932010-11-23 11:40:08 -05001246 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 goto out;
1248
1249 for (i = 0; i < num; i++) {
Eric Parisb77a4932010-11-23 11:40:08 -05001250 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 dentry = d_alloc_name(dir, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001252 if (!dentry)
1253 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
Eric Parisb77a4932010-11-23 11:40:08 -05001255 ret = -ENOMEM;
1256 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1257 if (!inode)
1258 goto out;
1259
1260 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001262 if (len < 0)
1263 goto out;
1264
1265 ret = -ENAMETOOLONG;
1266 if (len >= PAGE_SIZE)
1267 goto out;
1268
Eric Paris18729812008-04-17 14:15:45 -04001269 isec = (struct inode_security_struct *)inode->i_security;
1270 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1271 if (ret)
Eric Parisb77a4932010-11-23 11:40:08 -05001272 goto out;
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 isec->sid = sid;
1275 isec->initialized = 1;
1276 inode->i_fop = &sel_bool_ops;
James Carterbce34bc2007-04-04 16:18:50 -04001277 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 d_add(dentry, inode);
1279 }
1280 bool_num = num;
Stephen Smalleyd313f942007-11-26 11:12:53 -05001281 bool_pending_names = names;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 bool_pending_values = values;
Eric Parisb77a4932010-11-23 11:40:08 -05001283
1284 free_page((unsigned long)page);
1285 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286out:
1287 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001288
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 if (names) {
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001290 for (i = 0; i < num; i++)
1291 kfree(names[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 kfree(names);
1293 }
Davi Arnaut20c19e42005-10-23 12:57:16 -07001294 kfree(values);
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001295 sel_remove_entries(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001296
1297 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298}
1299
1300#define NULL_FILE_NAME "null"
1301
Eric Paris18729812008-04-17 14:15:45 -04001302struct dentry *selinux_null;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
1304static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1305 size_t count, loff_t *ppos)
1306{
1307 char tmpbuf[TMPBUFLEN];
1308 ssize_t length;
1309
1310 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1311 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1312}
1313
Eric Paris18729812008-04-17 14:15:45 -04001314static ssize_t sel_write_avc_cache_threshold(struct file *file,
1315 const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 size_t count, loff_t *ppos)
1317
1318{
Eric Parisb77a4932010-11-23 11:40:08 -05001319 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 ssize_t ret;
1321 int new_value;
1322
Eric Parisb77a4932010-11-23 11:40:08 -05001323 ret = task_has_security(current, SECURITY__SETSECPARAM);
1324 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Eric Parisb77a4932010-11-23 11:40:08 -05001327 ret = -ENOMEM;
1328 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330
Eric Parisb77a4932010-11-23 11:40:08 -05001331 /* No partial writes. */
1332 ret = -EINVAL;
1333 if (*ppos != 0)
1334 goto out;
1335
1336 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001337 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001338 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340
Eric Parisb77a4932010-11-23 11:40:08 -05001341 ret = -EFAULT;
1342 if (copy_from_user(page, buf, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344
Eric Parisb77a4932010-11-23 11:40:08 -05001345 ret = -EINVAL;
1346 if (sscanf(page, "%u", &new_value) != 1)
1347 goto out;
1348
1349 avc_cache_threshold = new_value;
1350
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 ret = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352out:
Eric Parisb77a4932010-11-23 11:40:08 -05001353 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 return ret;
1355}
1356
1357static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1358 size_t count, loff_t *ppos)
1359{
1360 char *page;
Eric Parisb77a4932010-11-23 11:40:08 -05001361 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
1363 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001364 if (!page)
1365 return -ENOMEM;
1366
1367 length = avc_get_hash_stats(page);
1368 if (length >= 0)
1369 length = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001371
1372 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373}
1374
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001375static const struct file_operations sel_avc_cache_threshold_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 .read = sel_read_avc_cache_threshold,
1377 .write = sel_write_avc_cache_threshold,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001378 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379};
1380
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001381static const struct file_operations sel_avc_hash_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 .read = sel_read_avc_hash_stats,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001383 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384};
1385
1386#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1387static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1388{
1389 int cpu;
1390
Rusty Russell4f4b6c12009-01-01 10:12:15 +10301391 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 if (!cpu_possible(cpu))
1393 continue;
1394 *idx = cpu + 1;
1395 return &per_cpu(avc_cache_stats, cpu);
1396 }
1397 return NULL;
1398}
1399
1400static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1401{
1402 loff_t n = *pos - 1;
1403
1404 if (*pos == 0)
1405 return SEQ_START_TOKEN;
1406
1407 return sel_avc_get_stat_idx(&n);
1408}
1409
1410static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1411{
1412 return sel_avc_get_stat_idx(pos);
1413}
1414
1415static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1416{
1417 struct avc_cache_stats *st = v;
1418
1419 if (v == SEQ_START_TOKEN)
1420 seq_printf(seq, "lookups hits misses allocations reclaims "
1421 "frees\n");
Linus Torvalds257313b2011-05-19 21:22:53 -07001422 else {
1423 unsigned int lookups = st->lookups;
1424 unsigned int misses = st->misses;
1425 unsigned int hits = lookups - misses;
1426 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1427 hits, misses, st->allocations,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 st->reclaims, st->frees);
Linus Torvalds257313b2011-05-19 21:22:53 -07001429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 return 0;
1431}
1432
1433static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1434{ }
1435
Jan Engelhardt1996a102008-01-23 00:02:58 +01001436static const struct seq_operations sel_avc_cache_stats_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 .start = sel_avc_stats_seq_start,
1438 .next = sel_avc_stats_seq_next,
1439 .show = sel_avc_stats_seq_show,
1440 .stop = sel_avc_stats_seq_stop,
1441};
1442
1443static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1444{
1445 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1446}
1447
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001448static const struct file_operations sel_avc_cache_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449 .open = sel_open_avc_cache_stats,
1450 .read = seq_read,
1451 .llseek = seq_lseek,
1452 .release = seq_release,
1453};
1454#endif
1455
1456static int sel_make_avc_files(struct dentry *dir)
1457{
Eric Parisb77a4932010-11-23 11:40:08 -05001458 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 static struct tree_descr files[] = {
1460 { "cache_threshold",
1461 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1462 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1463#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1464 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1465#endif
1466 };
1467
Nicolas Kaiser6e20a642006-01-06 00:11:22 -08001468 for (i = 0; i < ARRAY_SIZE(files); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 struct inode *inode;
1470 struct dentry *dentry;
1471
1472 dentry = d_alloc_name(dir, files[i].name);
Eric Parisb77a4932010-11-23 11:40:08 -05001473 if (!dentry)
1474 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
1476 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
Eric Parisb77a4932010-11-23 11:40:08 -05001477 if (!inode)
1478 return -ENOMEM;
1479
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480 inode->i_fop = files[i].ops;
James Carter6174eaf2007-04-04 16:18:39 -04001481 inode->i_ino = ++sel_last_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 d_add(dentry, inode);
1483 }
Eric Parisb77a4932010-11-23 11:40:08 -05001484
1485 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486}
1487
Eric Paris18729812008-04-17 14:15:45 -04001488static ssize_t sel_read_initcon(struct file *file, char __user *buf,
James Carterf0ee2e42007-04-04 10:11:29 -04001489 size_t count, loff_t *ppos)
1490{
1491 struct inode *inode;
1492 char *con;
1493 u32 sid, len;
1494 ssize_t ret;
1495
1496 inode = file->f_path.dentry->d_inode;
1497 sid = inode->i_ino&SEL_INO_MASK;
1498 ret = security_sid_to_context(sid, &con, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001499 if (ret)
James Carterf0ee2e42007-04-04 10:11:29 -04001500 return ret;
1501
1502 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1503 kfree(con);
1504 return ret;
1505}
1506
1507static const struct file_operations sel_initcon_ops = {
1508 .read = sel_read_initcon,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001509 .llseek = generic_file_llseek,
James Carterf0ee2e42007-04-04 10:11:29 -04001510};
1511
1512static int sel_make_initcon_files(struct dentry *dir)
1513{
Eric Parisb77a4932010-11-23 11:40:08 -05001514 int i;
James Carterf0ee2e42007-04-04 10:11:29 -04001515
1516 for (i = 1; i <= SECINITSID_NUM; i++) {
1517 struct inode *inode;
1518 struct dentry *dentry;
1519 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
Eric Parisb77a4932010-11-23 11:40:08 -05001520 if (!dentry)
1521 return -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001522
1523 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001524 if (!inode)
1525 return -ENOMEM;
1526
James Carterf0ee2e42007-04-04 10:11:29 -04001527 inode->i_fop = &sel_initcon_ops;
1528 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1529 d_add(dentry, inode);
1530 }
Eric Parisb77a4932010-11-23 11:40:08 -05001531
1532 return 0;
James Carterf0ee2e42007-04-04 10:11:29 -04001533}
1534
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001535static inline unsigned int sel_div(unsigned long a, unsigned long b)
1536{
1537 return a / b - (a % b < 0);
1538}
1539
1540static inline unsigned long sel_class_to_ino(u16 class)
1541{
1542 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1543}
1544
1545static inline u16 sel_ino_to_class(unsigned long ino)
1546{
1547 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1548}
1549
1550static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1551{
1552 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1553}
1554
1555static inline u32 sel_ino_to_perm(unsigned long ino)
1556{
1557 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1558}
1559
Eric Paris18729812008-04-17 14:15:45 -04001560static ssize_t sel_read_class(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001561 size_t count, loff_t *ppos)
1562{
1563 ssize_t rc, len;
1564 char *page;
1565 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1566
1567 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001568 if (!page)
1569 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001570
1571 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1572 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1573 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001574
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001575 return rc;
1576}
1577
1578static const struct file_operations sel_class_ops = {
1579 .read = sel_read_class,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001580 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001581};
1582
Eric Paris18729812008-04-17 14:15:45 -04001583static ssize_t sel_read_perm(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001584 size_t count, loff_t *ppos)
1585{
1586 ssize_t rc, len;
1587 char *page;
1588 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1589
1590 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001591 if (!page)
1592 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001593
Eric Paris18729812008-04-17 14:15:45 -04001594 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001595 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1596 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001597
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001598 return rc;
1599}
1600
1601static const struct file_operations sel_perm_ops = {
1602 .read = sel_read_perm,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001603 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001604};
1605
Paul Moore3bb56b22008-01-29 08:38:19 -05001606static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1607 size_t count, loff_t *ppos)
1608{
1609 int value;
1610 char tmpbuf[TMPBUFLEN];
1611 ssize_t length;
1612 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1613
1614 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1615 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1616
1617 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1618}
1619
1620static const struct file_operations sel_policycap_ops = {
1621 .read = sel_read_policycap,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001622 .llseek = generic_file_llseek,
Paul Moore3bb56b22008-01-29 08:38:19 -05001623};
1624
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001625static int sel_make_perm_files(char *objclass, int classvalue,
1626 struct dentry *dir)
1627{
Eric Parisb77a4932010-11-23 11:40:08 -05001628 int i, rc, nperms;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001629 char **perms;
1630
1631 rc = security_get_permissions(objclass, &perms, &nperms);
1632 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001633 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001634
1635 for (i = 0; i < nperms; i++) {
1636 struct inode *inode;
1637 struct dentry *dentry;
1638
Eric Parisb77a4932010-11-23 11:40:08 -05001639 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001640 dentry = d_alloc_name(dir, perms[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001641 if (!dentry)
1642 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001643
Eric Parisb77a4932010-11-23 11:40:08 -05001644 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001645 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001646 if (!inode)
1647 goto out;
1648
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001649 inode->i_fop = &sel_perm_ops;
1650 /* i+1 since perm values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001651 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001652 d_add(dentry, inode);
1653 }
Eric Parisb77a4932010-11-23 11:40:08 -05001654 rc = 0;
1655out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001656 for (i = 0; i < nperms; i++)
1657 kfree(perms[i]);
1658 kfree(perms);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001659 return rc;
1660}
1661
1662static int sel_make_class_dir_entries(char *classname, int index,
1663 struct dentry *dir)
1664{
1665 struct dentry *dentry = NULL;
1666 struct inode *inode = NULL;
1667 int rc;
1668
1669 dentry = d_alloc_name(dir, "index");
Eric Parisb77a4932010-11-23 11:40:08 -05001670 if (!dentry)
1671 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001672
1673 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001674 if (!inode)
1675 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001676
1677 inode->i_fop = &sel_class_ops;
1678 inode->i_ino = sel_class_to_ino(index);
1679 d_add(dentry, inode);
1680
1681 dentry = d_alloc_name(dir, "perms");
Eric Parisb77a4932010-11-23 11:40:08 -05001682 if (!dentry)
1683 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001684
1685 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1686 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001687 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001688
1689 rc = sel_make_perm_files(classname, index, dentry);
1690
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001691 return rc;
1692}
1693
1694static void sel_remove_classes(void)
1695{
1696 struct list_head *class_node;
1697
1698 list_for_each(class_node, &class_dir->d_subdirs) {
1699 struct dentry *class_subdir = list_entry(class_node,
1700 struct dentry, d_u.d_child);
1701 struct list_head *class_subdir_node;
1702
1703 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1704 struct dentry *d = list_entry(class_subdir_node,
1705 struct dentry, d_u.d_child);
1706
1707 if (d->d_inode)
1708 if (d->d_inode->i_mode & S_IFDIR)
1709 sel_remove_entries(d);
1710 }
1711
1712 sel_remove_entries(class_subdir);
1713 }
1714
1715 sel_remove_entries(class_dir);
1716}
1717
1718static int sel_make_classes(void)
1719{
Eric Parisb77a4932010-11-23 11:40:08 -05001720 int rc, nclasses, i;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001721 char **classes;
1722
1723 /* delete any existing entries */
1724 sel_remove_classes();
1725
1726 rc = security_get_classes(&classes, &nclasses);
Eric Parisb77a4932010-11-23 11:40:08 -05001727 if (rc)
1728 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001729
1730 /* +2 since classes are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001731 last_class_ino = sel_class_to_ino(nclasses + 2);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001732
1733 for (i = 0; i < nclasses; i++) {
1734 struct dentry *class_name_dir;
1735
Eric Parisb77a4932010-11-23 11:40:08 -05001736 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001737 class_name_dir = d_alloc_name(class_dir, classes[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001738 if (!class_name_dir)
1739 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001740
1741 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1742 &last_class_ino);
1743 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001744 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001745
1746 /* i+1 since class values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001747 rc = sel_make_class_dir_entries(classes[i], i + 1,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001748 class_name_dir);
1749 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001750 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001751 }
Eric Parisb77a4932010-11-23 11:40:08 -05001752 rc = 0;
1753out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001754 for (i = 0; i < nclasses; i++)
1755 kfree(classes[i]);
1756 kfree(classes);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001757 return rc;
1758}
1759
Paul Moore3bb56b22008-01-29 08:38:19 -05001760static int sel_make_policycap(void)
1761{
1762 unsigned int iter;
1763 struct dentry *dentry = NULL;
1764 struct inode *inode = NULL;
1765
1766 sel_remove_entries(policycap_dir);
1767
1768 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1769 if (iter < ARRAY_SIZE(policycap_names))
1770 dentry = d_alloc_name(policycap_dir,
1771 policycap_names[iter]);
1772 else
1773 dentry = d_alloc_name(policycap_dir, "unknown");
1774
1775 if (dentry == NULL)
1776 return -ENOMEM;
1777
1778 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1779 if (inode == NULL)
1780 return -ENOMEM;
1781
1782 inode->i_fop = &sel_policycap_ops;
1783 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1784 d_add(dentry, inode);
1785 }
1786
1787 return 0;
1788}
1789
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001790static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1791 unsigned long *ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 struct inode *inode;
1794
James Morrisedb20fb2006-03-22 00:09:20 -08001795 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001796 if (!inode)
1797 return -ENOMEM;
1798
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 inode->i_op = &simple_dir_inode_operations;
1800 inode->i_fop = &simple_dir_operations;
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001801 inode->i_ino = ++(*ino);
James Morris40e906f2006-03-22 00:09:16 -08001802 /* directory inodes start off with i_nlink == 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -07001803 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001804 d_add(dentry, inode);
James Morrisedb20fb2006-03-22 00:09:20 -08001805 /* bump link count on parent directory, too */
Dave Hansend8c76e62006-09-30 23:29:04 -07001806 inc_nlink(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001807
1808 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809}
1810
Eric Paris18729812008-04-17 14:15:45 -04001811static int sel_fill_super(struct super_block *sb, void *data, int silent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812{
1813 int ret;
1814 struct dentry *dentry;
James Morrisedb20fb2006-03-22 00:09:20 -08001815 struct inode *inode, *root_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 struct inode_security_struct *isec;
1817
1818 static struct tree_descr selinux_files[] = {
1819 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1820 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
Stephen Smalleyce9982d2005-11-08 21:34:33 -08001821 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1823 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1824 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1825 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1826 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1827 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1828 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1829 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1830 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1831 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
Eric Paris3f120702007-09-21 14:37:10 -04001832 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1833 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
KaiGai Kohei11904162010-09-14 18:28:39 +09001834 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
Eric Pariscee74f42010-10-13 17:50:25 -04001835 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 /* last one */ {""}
1837 };
1838 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1839 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001840 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
James Morrisedb20fb2006-03-22 00:09:20 -08001842 root_inode = sb->s_root->d_inode;
1843
Eric Parisb77a4932010-11-23 11:40:08 -05001844 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001846 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001847 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001849 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
James Morriscde174a2006-03-22 00:09:17 -08001850 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001851 goto err;
James Morriscde174a2006-03-22 00:09:17 -08001852
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 bool_dir = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854
Eric Parisb77a4932010-11-23 11:40:08 -05001855 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001857 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001858 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
Eric Parisb77a4932010-11-23 11:40:08 -05001860 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001862 if (!inode)
James Morris161ce452006-03-22 00:09:17 -08001863 goto err;
Eric Parisb77a4932010-11-23 11:40:08 -05001864
James Carter6174eaf2007-04-04 16:18:39 -04001865 inode->i_ino = ++sel_last_ino;
Eric Paris18729812008-04-17 14:15:45 -04001866 isec = (struct inode_security_struct *)inode->i_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 isec->sid = SECINITSID_DEVNULL;
1868 isec->sclass = SECCLASS_CHR_FILE;
1869 isec->initialized = 1;
1870
1871 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1872 d_add(dentry, inode);
1873 selinux_null = dentry;
1874
Eric Parisb77a4932010-11-23 11:40:08 -05001875 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 dentry = d_alloc_name(sb->s_root, "avc");
Eric Parisb77a4932010-11-23 11:40:08 -05001877 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001878 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001880 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001882 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883
1884 ret = sel_make_avc_files(dentry);
1885 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001886 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001887
Eric Parisb77a4932010-11-23 11:40:08 -05001888 ret = -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001889 dentry = d_alloc_name(sb->s_root, "initial_contexts");
Eric Parisb77a4932010-11-23 11:40:08 -05001890 if (!dentry)
James Carterf0ee2e42007-04-04 10:11:29 -04001891 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001892
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001893 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
James Carterf0ee2e42007-04-04 10:11:29 -04001894 if (ret)
1895 goto err;
1896
1897 ret = sel_make_initcon_files(dentry);
1898 if (ret)
1899 goto err;
1900
Eric Parisb77a4932010-11-23 11:40:08 -05001901 ret = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001902 dentry = d_alloc_name(sb->s_root, "class");
Eric Parisb77a4932010-11-23 11:40:08 -05001903 if (!dentry)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001904 goto err;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001905
1906 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1907 if (ret)
1908 goto err;
1909
1910 class_dir = dentry;
1911
Eric Parisb77a4932010-11-23 11:40:08 -05001912 ret = -ENOMEM;
Paul Moore3bb56b22008-01-29 08:38:19 -05001913 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
Eric Parisb77a4932010-11-23 11:40:08 -05001914 if (!dentry)
Paul Moore3bb56b22008-01-29 08:38:19 -05001915 goto err;
Paul Moore3bb56b22008-01-29 08:38:19 -05001916
1917 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1918 if (ret)
1919 goto err;
1920
1921 policycap_dir = dentry;
1922
Eric Parisb77a4932010-11-23 11:40:08 -05001923 return 0;
James Morris161ce452006-03-22 00:09:17 -08001924err:
Eric Paris744ba352008-04-17 11:52:44 -04001925 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1926 __func__);
Eric Parisb77a4932010-11-23 11:40:08 -05001927 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928}
1929
Al Virofc14f2f2010-07-25 01:48:30 +04001930static struct dentry *sel_mount(struct file_system_type *fs_type,
1931 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932{
Al Virofc14f2f2010-07-25 01:48:30 +04001933 return mount_single(fs_type, flags, data, sel_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934}
1935
1936static struct file_system_type sel_fs_type = {
1937 .name = "selinuxfs",
Al Virofc14f2f2010-07-25 01:48:30 +04001938 .mount = sel_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 .kill_sb = kill_litter_super,
1940};
1941
1942struct vfsmount *selinuxfs_mount;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001943static struct kobject *selinuxfs_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
1945static int __init init_sel_fs(void)
1946{
1947 int err;
1948
1949 if (!selinux_enabled)
1950 return 0;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001951
1952 selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj);
1953 if (!selinuxfs_kobj)
1954 return -ENOMEM;
1955
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 err = register_filesystem(&sel_fs_type);
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001957 if (err) {
1958 kobject_put(selinuxfs_kobj);
Eric Parisb77a4932010-11-23 11:40:08 -05001959 return err;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001960 }
Eric Parisb77a4932010-11-23 11:40:08 -05001961
1962 selinuxfs_mount = kern_mount(&sel_fs_type);
1963 if (IS_ERR(selinuxfs_mount)) {
1964 printk(KERN_ERR "selinuxfs: could not mount!\n");
1965 err = PTR_ERR(selinuxfs_mount);
1966 selinuxfs_mount = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 }
Eric Parisb77a4932010-11-23 11:40:08 -05001968
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 return err;
1970}
1971
1972__initcall(init_sel_fs);
1973
1974#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1975void exit_sel_fs(void)
1976{
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001977 kobject_put(selinuxfs_kobj);
Tim Chen423e0ab2011-07-19 09:32:38 -07001978 kern_unmount(selinuxfs_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979 unregister_filesystem(&sel_fs_type);
1980}
1981#endif