blob: 72c145dd799f175c09b98a9e6c9fa52fca4009b5 [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 Molnarbb0030792006-03-22 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",
Chris PeBenito2be4d742013-05-03 09:05:39 -040047 "open_perms",
48 "redhat1",
49 "always_check_network"
Paul Moore3bb56b22008-01-29 08:38:19 -050050};
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
53
54static int __init checkreqprot_setup(char *str)
55{
Eric Parisf5269712008-05-14 11:27:45 -040056 unsigned long checkreqprot;
Jingoo Han29707b22014-02-05 15:13:14 +090057 if (!kstrtoul(str, 0, &checkreqprot))
Eric Parisf5269712008-05-14 11:27:45 -040058 selinux_checkreqprot = checkreqprot ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 return 1;
60}
61__setup("checkreqprot=", checkreqprot_setup);
62
Ingo Molnarbb0030792006-03-22 00:09:14 -080063static DEFINE_MUTEX(sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65/* global data for booleans */
Eric Paris18729812008-04-17 14:15:45 -040066static struct dentry *bool_dir;
67static int bool_num;
Stephen Smalleyd313f94832007-11-26 11:12:53 -050068static char **bool_pending_names;
Eric Paris18729812008-04-17 14:15:45 -040069static int *bool_pending_values;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040071/* global data for classes */
Eric Paris18729812008-04-17 14:15:45 -040072static struct dentry *class_dir;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -040073static unsigned long last_class_ino;
74
Eric Pariscee74f42010-10-13 17:50:25 -040075static char policy_opened;
76
Paul Moore3bb56b22008-01-29 08:38:19 -050077/* global data for policy capabilities */
Eric Paris18729812008-04-17 14:15:45 -040078static struct dentry *policycap_dir;
Paul Moore3bb56b22008-01-29 08:38:19 -050079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080/* Check whether a task is allowed to use a security operation. */
81static int task_has_security(struct task_struct *tsk,
82 u32 perms)
83{
David Howellsc69e8d92008-11-14 10:39:19 +110084 const struct task_security_struct *tsec;
85 u32 sid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
David Howellsc69e8d92008-11-14 10:39:19 +110087 rcu_read_lock();
88 tsec = __task_cred(tsk)->security;
89 if (tsec)
90 sid = tsec->sid;
91 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (!tsec)
93 return -EACCES;
94
David Howellsc69e8d92008-11-14 10:39:19 +110095 return avc_has_perm(sid, SECINITSID_SECURITY,
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 SECCLASS_SECURITY, perms, NULL);
97}
98
99enum sel_inos {
100 SEL_ROOT_INO = 2,
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
James Morris4e5ab4c2006-06-09 00:33:33 -0700114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
Eric Paris3f120702007-09-21 14:37:10 -0400115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
KaiGai Kohei11904162010-09-14 18:28:39 +0900117 SEL_STATUS, /* export current status using mmap() */
Eric Pariscee74f42010-10-13 17:50:25 -0400118 SEL_POLICY, /* allow userspace to read the in kernel policy */
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500119 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
James Carter6174eaf2007-04-04 16:18:39 -0400120 SEL_INO_NEXT, /* The next inode number to use */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121};
122
James Carter6174eaf2007-04-04 16:18:39 -0400123static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
124
Paul Moore3bb56b22008-01-29 08:38:19 -0500125#define SEL_INITCON_INO_OFFSET 0x01000000
126#define SEL_BOOL_INO_OFFSET 0x02000000
127#define SEL_CLASS_INO_OFFSET 0x04000000
128#define SEL_POLICYCAP_INO_OFFSET 0x08000000
129#define SEL_INO_MASK 0x00ffffff
James Carterf0ee2e42007-04-04 10:11:29 -0400130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#define TMPBUFLEN 12
132static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
133 size_t count, loff_t *ppos)
134{
135 char tmpbuf[TMPBUFLEN];
136 ssize_t length;
137
138 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
139 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
140}
141
142#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
Eric Paris18729812008-04-17 14:15:45 -0400143static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 size_t count, loff_t *ppos)
145
146{
Eric Parisb77a4932010-11-23 11:40:08 -0500147 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 ssize_t length;
149 int new_value;
150
Davi Arnautbfd51622005-10-30 14:59:24 -0800151 if (count >= PAGE_SIZE)
Al Viro8365a712015-12-24 00:08:06 -0500152 return -ENOMEM;
Eric Parisb77a4932010-11-23 11:40:08 -0500153
154 /* No partial writes. */
Eric Parisb77a4932010-11-23 11:40:08 -0500155 if (*ppos != 0)
Al Viro8365a712015-12-24 00:08:06 -0500156 return -EINVAL;
Eric Parisb77a4932010-11-23 11:40:08 -0500157
Al Viro8365a712015-12-24 00:08:06 -0500158 page = memdup_user_nul(buf, count);
159 if (IS_ERR(page))
160 return PTR_ERR(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 length = -EINVAL;
163 if (sscanf(page, "%d", &new_value) != 1)
164 goto out;
165
166 if (new_value != selinux_enforcing) {
167 length = task_has_security(current, SECURITY__SETENFORCE);
168 if (length)
169 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000170 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500171 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
172 new_value, selinux_enforcing,
Eric W. Biederman581abc02012-08-20 00:09:36 -0700173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500174 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 selinux_enforcing = new_value;
176 if (selinux_enforcing)
177 avc_ss_reset(0);
178 selnl_notify_setenforce(selinux_enforcing);
KaiGai Kohei11904162010-09-14 18:28:39 +0900179 selinux_status_update_setenforce(selinux_enforcing);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181 length = count;
182out:
Al Viro8365a712015-12-24 00:08:06 -0500183 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return length;
185}
186#else
187#define sel_write_enforce NULL
188#endif
189
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800190static const struct file_operations sel_enforce_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 .read = sel_read_enforce,
192 .write = sel_write_enforce,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200193 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194};
195
Eric Paris3f120702007-09-21 14:37:10 -0400196static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
197 size_t count, loff_t *ppos)
198{
199 char tmpbuf[TMPBUFLEN];
200 ssize_t length;
Al Viro496ad9a2013-01-23 17:07:38 -0500201 ino_t ino = file_inode(filp)->i_ino;
Eric Paris3f120702007-09-21 14:37:10 -0400202 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
203 security_get_reject_unknown() : !security_get_allow_unknown();
204
205 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
206 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
207}
208
209static const struct file_operations sel_handle_unknown_ops = {
210 .read = sel_read_handle_unknown,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200211 .llseek = generic_file_llseek,
Eric Paris3f120702007-09-21 14:37:10 -0400212};
213
KaiGai Kohei11904162010-09-14 18:28:39 +0900214static int sel_open_handle_status(struct inode *inode, struct file *filp)
215{
216 struct page *status = selinux_kernel_status_page();
217
218 if (!status)
219 return -ENOMEM;
220
221 filp->private_data = status;
222
223 return 0;
224}
225
226static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
227 size_t count, loff_t *ppos)
228{
229 struct page *status = filp->private_data;
230
231 BUG_ON(!status);
232
233 return simple_read_from_buffer(buf, count, ppos,
234 page_address(status),
235 sizeof(struct selinux_kernel_status));
236}
237
238static int sel_mmap_handle_status(struct file *filp,
239 struct vm_area_struct *vma)
240{
241 struct page *status = filp->private_data;
242 unsigned long size = vma->vm_end - vma->vm_start;
243
244 BUG_ON(!status);
245
246 /* only allows one page from the head */
247 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
248 return -EIO;
249 /* disallow writable mapping */
250 if (vma->vm_flags & VM_WRITE)
251 return -EPERM;
252 /* disallow mprotect() turns it into writable */
253 vma->vm_flags &= ~VM_MAYWRITE;
254
255 return remap_pfn_range(vma, vma->vm_start,
256 page_to_pfn(status),
257 size, vma->vm_page_prot);
258}
259
260static const struct file_operations sel_handle_status_ops = {
261 .open = sel_open_handle_status,
262 .read = sel_read_handle_status,
263 .mmap = sel_mmap_handle_status,
264 .llseek = generic_file_llseek,
265};
266
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267#ifdef CONFIG_SECURITY_SELINUX_DISABLE
Eric Paris18729812008-04-17 14:15:45 -0400268static ssize_t sel_write_disable(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 size_t count, loff_t *ppos)
270
271{
Al Viro8365a712015-12-24 00:08:06 -0500272 char *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 ssize_t length;
274 int new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Davi Arnautbfd51622005-10-30 14:59:24 -0800276 if (count >= PAGE_SIZE)
Al Viro8365a712015-12-24 00:08:06 -0500277 return -ENOMEM;
Eric Parisb77a4932010-11-23 11:40:08 -0500278
279 /* No partial writes. */
Eric Parisb77a4932010-11-23 11:40:08 -0500280 if (*ppos != 0)
Al Viro8365a712015-12-24 00:08:06 -0500281 return -EINVAL;
Eric Parisb77a4932010-11-23 11:40:08 -0500282
Al Viro8365a712015-12-24 00:08:06 -0500283 page = memdup_user_nul(buf, count);
284 if (IS_ERR(page))
285 return PTR_ERR(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 length = -EINVAL;
288 if (sscanf(page, "%d", &new_value) != 1)
289 goto out;
290
291 if (new_value) {
292 length = selinux_disable();
Eric Parisb77a4932010-11-23 11:40:08 -0500293 if (length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000295 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500296 "selinux=0 auid=%u ses=%u",
Eric W. Biederman581abc02012-08-20 00:09:36 -0700297 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500298 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
300
301 length = count;
302out:
Al Viro8365a712015-12-24 00:08:06 -0500303 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 return length;
305}
306#else
307#define sel_write_disable NULL
308#endif
309
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800310static const struct file_operations sel_disable_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 .write = sel_write_disable,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200312 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313};
314
315static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
Eric Paris18729812008-04-17 14:15:45 -0400316 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
318 char tmpbuf[TMPBUFLEN];
319 ssize_t length;
320
321 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
322 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
323}
324
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800325static const struct file_operations sel_policyvers_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 .read = sel_read_policyvers,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200327 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328};
329
330/* declaration for sel_write_load */
331static int sel_make_bools(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400332static int sel_make_classes(void);
Paul Moore3bb56b22008-01-29 08:38:19 -0500333static int sel_make_policycap(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400334
335/* declaration for sel_make_class_dirs */
Al Viroa1c2aa12012-03-18 20:36:59 -0400336static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400337 unsigned long *ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339static ssize_t sel_read_mls(struct file *filp, char __user *buf,
340 size_t count, loff_t *ppos)
341{
342 char tmpbuf[TMPBUFLEN];
343 ssize_t length;
344
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100345 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
346 security_mls_enabled());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
348}
349
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800350static const struct file_operations sel_mls_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 .read = sel_read_mls,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200352 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353};
354
Eric Pariscee74f42010-10-13 17:50:25 -0400355struct policy_load_memory {
356 size_t len;
357 void *data;
358};
359
360static int sel_open_policy(struct inode *inode, struct file *filp)
361{
362 struct policy_load_memory *plm = NULL;
363 int rc;
364
365 BUG_ON(filp->private_data);
366
367 mutex_lock(&sel_mutex);
368
369 rc = task_has_security(current, SECURITY__READ_POLICY);
370 if (rc)
371 goto err;
372
373 rc = -EBUSY;
374 if (policy_opened)
375 goto err;
376
377 rc = -ENOMEM;
378 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
379 if (!plm)
380 goto err;
381
382 if (i_size_read(inode) != security_policydb_len()) {
Al Viro59551022016-01-22 15:40:57 -0500383 inode_lock(inode);
Eric Pariscee74f42010-10-13 17:50:25 -0400384 i_size_write(inode, security_policydb_len());
Al Viro59551022016-01-22 15:40:57 -0500385 inode_unlock(inode);
Eric Pariscee74f42010-10-13 17:50:25 -0400386 }
387
388 rc = security_read_policy(&plm->data, &plm->len);
389 if (rc)
390 goto err;
391
392 policy_opened = 1;
393
394 filp->private_data = plm;
395
396 mutex_unlock(&sel_mutex);
397
398 return 0;
399err:
400 mutex_unlock(&sel_mutex);
401
402 if (plm)
403 vfree(plm->data);
404 kfree(plm);
405 return rc;
406}
407
408static int sel_release_policy(struct inode *inode, struct file *filp)
409{
410 struct policy_load_memory *plm = filp->private_data;
411
412 BUG_ON(!plm);
413
414 policy_opened = 0;
415
416 vfree(plm->data);
417 kfree(plm);
418
419 return 0;
420}
421
422static ssize_t sel_read_policy(struct file *filp, char __user *buf,
423 size_t count, loff_t *ppos)
424{
425 struct policy_load_memory *plm = filp->private_data;
426 int ret;
427
428 mutex_lock(&sel_mutex);
429
430 ret = task_has_security(current, SECURITY__READ_POLICY);
431 if (ret)
432 goto out;
433
434 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
435out:
436 mutex_unlock(&sel_mutex);
437 return ret;
438}
439
Eric Paris845ca302010-10-13 17:50:31 -0400440static int sel_mmap_policy_fault(struct vm_area_struct *vma,
441 struct vm_fault *vmf)
442{
443 struct policy_load_memory *plm = vma->vm_file->private_data;
444 unsigned long offset;
445 struct page *page;
446
447 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
448 return VM_FAULT_SIGBUS;
449
450 offset = vmf->pgoff << PAGE_SHIFT;
451 if (offset >= roundup(plm->len, PAGE_SIZE))
452 return VM_FAULT_SIGBUS;
453
454 page = vmalloc_to_page(plm->data + offset);
455 get_page(page);
456
457 vmf->page = page;
458
459 return 0;
460}
461
Kirill A. Shutemov7cbea8d2015-09-09 15:39:26 -0700462static const struct vm_operations_struct sel_mmap_policy_ops = {
Eric Paris845ca302010-10-13 17:50:31 -0400463 .fault = sel_mmap_policy_fault,
464 .page_mkwrite = sel_mmap_policy_fault,
465};
466
James Morrisad3fa082011-08-30 10:50:12 +1000467static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
Eric Paris845ca302010-10-13 17:50:31 -0400468{
469 if (vma->vm_flags & VM_SHARED) {
470 /* do not allow mprotect to make mapping writable */
471 vma->vm_flags &= ~VM_MAYWRITE;
472
473 if (vma->vm_flags & VM_WRITE)
474 return -EACCES;
475 }
476
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -0700477 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Eric Paris845ca302010-10-13 17:50:31 -0400478 vma->vm_ops = &sel_mmap_policy_ops;
479
480 return 0;
481}
482
Eric Pariscee74f42010-10-13 17:50:25 -0400483static const struct file_operations sel_policy_ops = {
484 .open = sel_open_policy,
485 .read = sel_read_policy,
Eric Paris845ca302010-10-13 17:50:31 -0400486 .mmap = sel_mmap_policy,
Eric Pariscee74f42010-10-13 17:50:25 -0400487 .release = sel_release_policy,
Eric Paris47a93a52012-02-16 15:08:39 -0500488 .llseek = generic_file_llseek,
Eric Pariscee74f42010-10-13 17:50:25 -0400489};
490
Eric Paris18729812008-04-17 14:15:45 -0400491static ssize_t sel_write_load(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 size_t count, loff_t *ppos)
493
494{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 ssize_t length;
496 void *data = NULL;
497
Ingo Molnarbb0030792006-03-22 00:09:14 -0800498 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 length = task_has_security(current, SECURITY__LOAD_POLICY);
501 if (length)
502 goto out;
503
Eric Parisb77a4932010-11-23 11:40:08 -0500504 /* No partial writes. */
505 length = -EINVAL;
506 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
Eric Parisb77a4932010-11-23 11:40:08 -0500509 length = -EFBIG;
510 if (count > 64 * 1024 * 1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500512
513 length = -ENOMEM;
514 data = vmalloc(count);
515 if (!data)
516 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 length = -EFAULT;
519 if (copy_from_user(data, buf, count) != 0)
520 goto out;
521
522 length = security_load_policy(data, count);
523 if (length)
524 goto out;
525
Eric Parisb77a4932010-11-23 11:40:08 -0500526 length = sel_make_bools();
527 if (length)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400528 goto out1;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400529
Eric Parisb77a4932010-11-23 11:40:08 -0500530 length = sel_make_classes();
531 if (length)
Paul Moore3bb56b22008-01-29 08:38:19 -0500532 goto out1;
Paul Moore3bb56b22008-01-29 08:38:19 -0500533
Eric Parisb77a4932010-11-23 11:40:08 -0500534 length = sel_make_policycap();
535 if (length)
536 goto out1;
537
538 length = count;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400539
540out1:
Steve Grubbaf601e42006-01-04 14:08:39 +0000541 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
Eric Paris4746ec52008-01-08 10:06:53 -0500542 "policy loaded auid=%u ses=%u",
Eric W. Biederman581abc02012-08-20 00:09:36 -0700543 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500544 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545out:
Ingo Molnarbb0030792006-03-22 00:09:14 -0800546 mutex_unlock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 vfree(data);
548 return length;
549}
550
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800551static const struct file_operations sel_load_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 .write = sel_write_load,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200553 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554};
555
Eric Paris18729812008-04-17 14:15:45 -0400556static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Eric Parisb77a4932010-11-23 11:40:08 -0500558 char *canon = NULL;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800559 u32 sid, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 ssize_t length;
561
562 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
563 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500564 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100566 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500567 if (length)
568 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800570 length = security_sid_to_context(sid, &canon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500571 if (length)
572 goto out;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800573
Eric Parisb77a4932010-11-23 11:40:08 -0500574 length = -ERANGE;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800575 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400576 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
577 "payload max\n", __func__, len);
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800578 goto out;
579 }
580
581 memcpy(buf, canon, len);
582 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583out:
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800584 kfree(canon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 return length;
586}
587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
589 size_t count, loff_t *ppos)
590{
591 char tmpbuf[TMPBUFLEN];
592 ssize_t length;
593
594 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
595 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
596}
597
Eric Paris18729812008-04-17 14:15:45 -0400598static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 size_t count, loff_t *ppos)
600{
Al Viro8365a712015-12-24 00:08:06 -0500601 char *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 ssize_t length;
603 unsigned int new_value;
604
605 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
606 if (length)
Al Viro8365a712015-12-24 00:08:06 -0500607 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Davi Arnautbfd51622005-10-30 14:59:24 -0800609 if (count >= PAGE_SIZE)
Al Viro8365a712015-12-24 00:08:06 -0500610 return -ENOMEM;
Eric Parisb77a4932010-11-23 11:40:08 -0500611
612 /* No partial writes. */
Eric Parisb77a4932010-11-23 11:40:08 -0500613 if (*ppos != 0)
Al Viro8365a712015-12-24 00:08:06 -0500614 return -EINVAL;
Eric Parisb77a4932010-11-23 11:40:08 -0500615
Al Viro8365a712015-12-24 00:08:06 -0500616 page = memdup_user_nul(buf, count);
617 if (IS_ERR(page))
618 return PTR_ERR(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 length = -EINVAL;
621 if (sscanf(page, "%u", &new_value) != 1)
622 goto out;
623
624 selinux_checkreqprot = new_value ? 1 : 0;
625 length = count;
626out:
Al Viro8365a712015-12-24 00:08:06 -0500627 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return length;
629}
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800630static const struct file_operations sel_checkreqprot_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 .read = sel_read_checkreqprot,
632 .write = sel_write_checkreqprot,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200633 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634};
635
Andrew Perepechkof9df6452015-12-24 11:09:41 -0500636static ssize_t sel_write_validatetrans(struct file *file,
637 const char __user *buf,
638 size_t count, loff_t *ppos)
639{
640 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
641 char *req = NULL;
642 u32 osid, nsid, tsid;
643 u16 tclass;
644 int rc;
645
646 rc = task_has_security(current, SECURITY__VALIDATE_TRANS);
647 if (rc)
648 goto out;
649
650 rc = -ENOMEM;
651 if (count >= PAGE_SIZE)
652 goto out;
653
654 /* No partial writes. */
655 rc = -EINVAL;
656 if (*ppos != 0)
657 goto out;
658
659 rc = -ENOMEM;
660 req = kzalloc(count + 1, GFP_KERNEL);
661 if (!req)
662 goto out;
663
664 rc = -EFAULT;
665 if (copy_from_user(req, buf, count))
666 goto out;
667
668 rc = -ENOMEM;
669 oldcon = kzalloc(count + 1, GFP_KERNEL);
670 if (!oldcon)
671 goto out;
672
673 newcon = kzalloc(count + 1, GFP_KERNEL);
674 if (!newcon)
675 goto out;
676
677 taskcon = kzalloc(count + 1, GFP_KERNEL);
678 if (!taskcon)
679 goto out;
680
681 rc = -EINVAL;
682 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
683 goto out;
684
685 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
686 if (rc)
687 goto out;
688
689 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
690 if (rc)
691 goto out;
692
693 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
694 if (rc)
695 goto out;
696
697 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
698 if (!rc)
699 rc = count;
700out:
701 kfree(req);
702 kfree(oldcon);
703 kfree(newcon);
704 kfree(taskcon);
705 return rc;
706}
707
708static const struct file_operations sel_transition_ops = {
709 .write = sel_write_validatetrans,
710 .llseek = generic_file_llseek,
711};
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713/*
714 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
715 */
Eric Paris18729812008-04-17 14:15:45 -0400716static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
717static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
718static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
719static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
720static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722static ssize_t (*write_op[])(struct file *, char *, size_t) = {
723 [SEL_ACCESS] = sel_write_access,
724 [SEL_CREATE] = sel_write_create,
725 [SEL_RELABEL] = sel_write_relabel,
726 [SEL_USER] = sel_write_user,
727 [SEL_MEMBER] = sel_write_member,
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800728 [SEL_CONTEXT] = sel_write_context,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729};
730
731static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
732{
Al Viro496ad9a2013-01-23 17:07:38 -0500733 ino_t ino = file_inode(file)->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 char *data;
735 ssize_t rv;
736
Nicolas Kaiser6e20a642006-01-06 00:11:22 -0800737 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 return -EINVAL;
739
740 data = simple_transaction_get(file, buf, size);
741 if (IS_ERR(data))
742 return PTR_ERR(data);
743
Eric Paris18729812008-04-17 14:15:45 -0400744 rv = write_op[ino](file, data, size);
745 if (rv > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 simple_transaction_set(file, rv);
747 rv = size;
748 }
749 return rv;
750}
751
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800752static const struct file_operations transaction_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 .write = selinux_transaction_write,
754 .read = simple_transaction_read,
755 .release = simple_transaction_release,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200756 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757};
758
759/*
760 * payload - write methods
761 * If the method has a response, the response should be put in buf,
762 * and the length returned. Otherwise return 0 or and -error.
763 */
764
Eric Paris18729812008-04-17 14:15:45 -0400765static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
Eric Parisb77a4932010-11-23 11:40:08 -0500767 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 u32 ssid, tsid;
769 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 struct av_decision avd;
771 ssize_t length;
772
773 length = task_has_security(current, SECURITY__COMPUTE_AV);
774 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500775 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800778 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500780 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Eric Parisb77a4932010-11-23 11:40:08 -0500782 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800783 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 if (!tcon)
785 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 length = -EINVAL;
Stephen Smalley19439d02010-01-14 17:28:10 -0500788 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500789 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400791 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500792 if (length)
793 goto out;
794
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400795 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500796 if (length)
797 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
Stephen Smalley19439d02010-01-14 17:28:10 -0500799 security_compute_av_user(ssid, tsid, tclass, &avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
801 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900802 "%x %x %x %x %u %x",
Eric Parisf1c63812009-02-12 14:50:54 -0500803 avd.allowed, 0xffffffff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 avd.auditallow, avd.auditdeny,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900805 avd.seqno, avd.flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806out:
Eric Parisb77a4932010-11-23 11:40:08 -0500807 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_create(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;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100815 char *namebuf = NULL, *objname = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 u32 ssid, tsid, newsid;
817 u16 tclass;
818 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500819 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 u32 len;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100821 int nargs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
823 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
824 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500825 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826
827 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800828 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500830 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Eric Parisb77a4932010-11-23 11:40:08 -0500832 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800833 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 if (!tcon)
835 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100837 length = -ENOMEM;
838 namebuf = kzalloc(size + 1, GFP_KERNEL);
839 if (!namebuf)
Eric Parisb77a4932010-11-23 11:40:08 -0500840 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100842 length = -EINVAL;
843 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
844 if (nargs < 3 || nargs > 4)
845 goto out;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400846 if (nargs == 4) {
847 /*
848 * If and when the name of new object to be queried contains
849 * either whitespace or multibyte characters, they shall be
850 * encoded based on the percentage-encoding rule.
851 * If not encoded, the sscanf logic picks up only left-half
852 * of the supplied name; splitted by a whitespace unexpectedly.
853 */
854 char *r, *w;
855 int c1, c2;
856
857 r = w = namebuf;
858 do {
859 c1 = *r++;
860 if (c1 == '+')
861 c1 = ' ';
862 else if (c1 == '%') {
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800863 c1 = hex_to_bin(*r++);
864 if (c1 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400865 goto out;
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800866 c2 = hex_to_bin(*r++);
867 if (c2 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400868 goto out;
869 c1 = (c1 << 4) | c2;
870 }
871 *w++ = c1;
872 } while (c1 != '\0');
873
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100874 objname = namebuf;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400875 }
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100876
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400877 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500878 if (length)
879 goto out;
880
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400881 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500882 if (length)
883 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100885 length = security_transition_sid_user(ssid, tsid, tclass,
886 objname, &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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400896 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
897 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -0500898 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 }
900
901 memcpy(buf, newcon, len);
902 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903out:
Eric Parisb77a4932010-11-23 11:40:08 -0500904 kfree(newcon);
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100905 kfree(namebuf);
Eric Parisb77a4932010-11-23 11:40:08 -0500906 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 kfree(scon);
908 return length;
909}
910
Eric Paris18729812008-04-17 14:15:45 -0400911static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912{
Eric Parisb77a4932010-11-23 11:40:08 -0500913 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 u32 ssid, tsid, newsid;
915 u16 tclass;
916 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500917 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 u32 len;
919
920 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
921 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500922 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800925 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500927 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Eric Parisb77a4932010-11-23 11:40:08 -0500929 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800930 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 if (!tcon)
932 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 length = -EINVAL;
935 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500936 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400938 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500939 if (length)
940 goto out;
941
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400942 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500943 if (length)
944 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 length = security_change_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500947 if (length)
948 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500951 if (length)
952 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
Eric Parisb77a4932010-11-23 11:40:08 -0500954 length = -ERANGE;
955 if (len > SIMPLE_TRANSACTION_LIMIT)
956 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957
958 memcpy(buf, newcon, len);
959 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960out:
Eric Parisb77a4932010-11-23 11:40:08 -0500961 kfree(newcon);
962 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 kfree(scon);
964 return length;
965}
966
Eric Paris18729812008-04-17 14:15:45 -0400967static ssize_t sel_write_user(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 *con = NULL, *user = NULL, *ptr;
970 u32 sid, *sids = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 ssize_t length;
972 char *newcon;
973 int i, rc;
974 u32 len, nsids;
975
976 length = task_has_security(current, SECURITY__COMPUTE_USER);
977 if (length)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700978 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
980 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800981 con = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 if (!con)
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 user = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 if (!user)
988 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990 length = -EINVAL;
991 if (sscanf(buf, "%s %s", con, user) != 2)
Eric Parisb77a4932010-11-23 11:40:08 -0500992 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
Rasmus Villemoes44be2f62015-10-21 17:44:25 -0400994 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500995 if (length)
996 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
998 length = security_get_user_sids(sid, user, &sids, &nsids);
Eric Parisb77a4932010-11-23 11:40:08 -0500999 if (length)
1000 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001
1002 length = sprintf(buf, "%u", nsids) + 1;
1003 ptr = buf + length;
1004 for (i = 0; i < nsids; i++) {
1005 rc = security_sid_to_context(sids[i], &newcon, &len);
1006 if (rc) {
1007 length = rc;
Eric Parisb77a4932010-11-23 11:40:08 -05001008 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
1010 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1011 kfree(newcon);
1012 length = -ERANGE;
Eric Parisb77a4932010-11-23 11:40:08 -05001013 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 }
1015 memcpy(ptr, newcon, len);
1016 kfree(newcon);
1017 ptr += len;
1018 length += len;
1019 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020out:
Eric Parisb77a4932010-11-23 11:40:08 -05001021 kfree(sids);
1022 kfree(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 kfree(con);
1024 return length;
1025}
1026
Eric Paris18729812008-04-17 14:15:45 -04001027static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028{
Eric Parisb77a4932010-11-23 11:40:08 -05001029 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 u32 ssid, tsid, newsid;
1031 u16 tclass;
1032 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -05001033 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 u32 len;
1035
1036 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
1037 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -05001038 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
1040 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001041 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 if (!scon)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -07001043 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
Eric Parisb77a4932010-11-23 11:40:08 -05001045 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001046 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 if (!tcon)
1048 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
1050 length = -EINVAL;
1051 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -05001052 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
Rasmus Villemoes44be2f62015-10-21 17:44:25 -04001054 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001055 if (length)
1056 goto out;
1057
Rasmus Villemoes44be2f62015-10-21 17:44:25 -04001058 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001059 if (length)
1060 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062 length = security_member_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -05001063 if (length)
1064 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
1066 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001067 if (length)
1068 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
Eric Parisb77a4932010-11-23 11:40:08 -05001070 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -04001072 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1073 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -05001074 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 }
1076
1077 memcpy(buf, newcon, len);
1078 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079out:
Eric Parisb77a4932010-11-23 11:40:08 -05001080 kfree(newcon);
1081 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 kfree(scon);
1083 return length;
1084}
1085
1086static struct inode *sel_make_inode(struct super_block *sb, int mode)
1087{
1088 struct inode *ret = new_inode(sb);
1089
1090 if (ret) {
1091 ret->i_mode = mode;
Deepa Dinamani078cd822016-09-14 07:48:04 -07001092 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 }
1094 return ret;
1095}
1096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1098 size_t count, loff_t *ppos)
1099{
1100 char *page = NULL;
1101 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 ssize_t ret;
1103 int cur_enforcing;
Al Viro496ad9a2013-01-23 17:07:38 -05001104 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001105 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
Ingo Molnarbb0030792006-03-22 00:09:14 -08001107 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
Eric Parisb77a4932010-11-23 11:40:08 -05001109 ret = -EINVAL;
1110 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001111 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Eric Parisb77a4932010-11-23 11:40:08 -05001113 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001114 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001115 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001118 cur_enforcing = security_get_bool_value(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 if (cur_enforcing < 0) {
1120 ret = cur_enforcing;
1121 goto out;
1122 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001124 bool_pending_values[index]);
Stephen Smalley68bdcf22006-03-22 00:09:15 -08001125 ret = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126out:
Ingo Molnarbb0030792006-03-22 00:09:14 -08001127 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001128 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 return ret;
1130}
1131
1132static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1133 size_t count, loff_t *ppos)
1134{
1135 char *page = NULL;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001136 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 int new_value;
Al Viro496ad9a2013-01-23 17:07:38 -05001138 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001139 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140
Ingo Molnarbb0030792006-03-22 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 = -EINVAL;
1148 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001149 goto out;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001150
Eric Parisb77a4932010-11-23 11:40:08 -05001151 length = -ENOMEM;
1152 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 goto out;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001154
Eric Parisb77a4932010-11-23 11:40:08 -05001155 /* No partial writes. */
1156 length = -EINVAL;
1157 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001159
Al Viro8365a712015-12-24 00:08:06 -05001160 page = memdup_user_nul(buf, count);
1161 if (IS_ERR(page)) {
1162 length = PTR_ERR(page);
1163 page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 goto out;
Al Viro8365a712015-12-24 00:08:06 -05001165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
1167 length = -EINVAL;
1168 if (sscanf(page, "%d", &new_value) != 1)
1169 goto out;
1170
1171 if (new_value)
1172 new_value = 1;
1173
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001174 bool_pending_values[index] = new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 length = count;
1176
1177out:
Ingo Molnarbb0030792006-03-22 00:09:14 -08001178 mutex_unlock(&sel_mutex);
Al Viro8365a712015-12-24 00:08:06 -05001179 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 return length;
1181}
1182
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001183static const struct file_operations sel_bool_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001184 .read = sel_read_bool,
1185 .write = sel_write_bool,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001186 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187};
1188
1189static ssize_t sel_commit_bools_write(struct file *filep,
1190 const char __user *buf,
1191 size_t count, loff_t *ppos)
1192{
1193 char *page = NULL;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001194 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 int new_value;
1196
Ingo Molnarbb0030792006-03-22 00:09:14 -08001197 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
1199 length = task_has_security(current, SECURITY__SETBOOL);
1200 if (length)
1201 goto out;
1202
Eric Parisb77a4932010-11-23 11:40:08 -05001203 length = -ENOMEM;
1204 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001206
1207 /* No partial writes. */
1208 length = -EINVAL;
1209 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001211
Al Viro8365a712015-12-24 00:08:06 -05001212 page = memdup_user_nul(buf, count);
1213 if (IS_ERR(page)) {
1214 length = PTR_ERR(page);
1215 page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 goto out;
Al Viro8365a712015-12-24 00:08:06 -05001217 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218
1219 length = -EINVAL;
1220 if (sscanf(page, "%d", &new_value) != 1)
1221 goto out;
1222
Eric Parisb77a4932010-11-23 11:40:08 -05001223 length = 0;
Eric Paris18729812008-04-17 14:15:45 -04001224 if (new_value && bool_pending_values)
Eric Parisb77a4932010-11-23 11:40:08 -05001225 length = security_set_bools(bool_num, bool_pending_values);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226
Eric Parisb77a4932010-11-23 11:40:08 -05001227 if (!length)
1228 length = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230out:
Ingo Molnarbb0030792006-03-22 00:09:14 -08001231 mutex_unlock(&sel_mutex);
Al Viro8365a712015-12-24 00:08:06 -05001232 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 return length;
1234}
1235
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001236static const struct file_operations sel_commit_bools_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001237 .write = sel_commit_bools_write,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001238 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239};
1240
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001241static void sel_remove_entries(struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242{
Al Viroad521842014-12-24 14:56:48 -05001243 d_genocide(de);
1244 shrink_dcache_parent(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245}
1246
1247#define BOOL_DIR_NAME "booleans"
1248
1249static int sel_make_bools(void)
1250{
Eric Parisb77a4932010-11-23 11:40:08 -05001251 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 ssize_t len;
1253 struct dentry *dentry = NULL;
1254 struct dentry *dir = bool_dir;
1255 struct inode *inode = NULL;
1256 struct inode_security_struct *isec;
1257 char **names = NULL, *page;
1258 int num;
1259 int *values = NULL;
1260 u32 sid;
1261
1262 /* remove any existing files */
Xiaotian Feng8007f102010-02-09 08:22:24 +11001263 for (i = 0; i < bool_num; i++)
1264 kfree(bool_pending_names[i]);
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001265 kfree(bool_pending_names);
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001266 kfree(bool_pending_values);
Eric Paris154c50c2012-04-04 13:47:11 -04001267 bool_num = 0;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001268 bool_pending_names = NULL;
Davi Arnaut20c19e42005-10-23 12:57:16 -07001269 bool_pending_values = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001271 sel_remove_entries(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272
Eric Parisb77a4932010-11-23 11:40:08 -05001273 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001274 page = (char *)get_zeroed_page(GFP_KERNEL);
1275 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -05001276 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
1278 ret = security_get_bools(&num, &names, &values);
Eric Parisb77a4932010-11-23 11:40:08 -05001279 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 goto out;
1281
1282 for (i = 0; i < num; i++) {
Eric Parisb77a4932010-11-23 11:40:08 -05001283 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 dentry = d_alloc_name(dir, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001285 if (!dentry)
1286 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
Eric Parisb77a4932010-11-23 11:40:08 -05001288 ret = -ENOMEM;
1289 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1290 if (!inode)
1291 goto out;
1292
Eric Parisb77a4932010-11-23 11:40:08 -05001293 ret = -ENAMETOOLONG;
Al Virocc1dad72012-04-02 19:40:47 -04001294 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001295 if (len >= PAGE_SIZE)
1296 goto out;
1297
Eric Paris18729812008-04-17 14:15:45 -04001298 isec = (struct inode_security_struct *)inode->i_security;
1299 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1300 if (ret)
Eric Parisb77a4932010-11-23 11:40:08 -05001301 goto out;
1302
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 isec->sid = sid;
1304 isec->initialized = 1;
1305 inode->i_fop = &sel_bool_ops;
James Carterbce34bc2007-04-04 16:18:50 -04001306 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 d_add(dentry, inode);
1308 }
1309 bool_num = num;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001310 bool_pending_names = names;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 bool_pending_values = values;
Eric Parisb77a4932010-11-23 11:40:08 -05001312
1313 free_page((unsigned long)page);
1314 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315out:
1316 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001317
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 if (names) {
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001319 for (i = 0; i < num; i++)
1320 kfree(names[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 kfree(names);
1322 }
Davi Arnaut20c19e42005-10-23 12:57:16 -07001323 kfree(values);
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001324 sel_remove_entries(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001325
1326 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327}
1328
1329#define NULL_FILE_NAME "null"
1330
Al Viro765927b2012-06-26 21:58:53 +04001331struct path selinux_null;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
1333static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1334 size_t count, loff_t *ppos)
1335{
1336 char tmpbuf[TMPBUFLEN];
1337 ssize_t length;
1338
1339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1341}
1342
Eric Paris18729812008-04-17 14:15:45 -04001343static ssize_t sel_write_avc_cache_threshold(struct file *file,
1344 const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 size_t count, loff_t *ppos)
1346
1347{
Al Viro8365a712015-12-24 00:08:06 -05001348 char *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 ssize_t ret;
Heinrich Schuchardt309c5fa2016-06-10 23:14:26 +02001350 unsigned int new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
Eric Parisb77a4932010-11-23 11:40:08 -05001352 ret = task_has_security(current, SECURITY__SETSECPARAM);
1353 if (ret)
Al Viro8365a712015-12-24 00:08:06 -05001354 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355
Eric Parisb77a4932010-11-23 11:40:08 -05001356 if (count >= PAGE_SIZE)
Al Viro8365a712015-12-24 00:08:06 -05001357 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Eric Parisb77a4932010-11-23 11:40:08 -05001359 /* No partial writes. */
Eric Parisb77a4932010-11-23 11:40:08 -05001360 if (*ppos != 0)
Al Viro8365a712015-12-24 00:08:06 -05001361 return -EINVAL;
Eric Parisb77a4932010-11-23 11:40:08 -05001362
Al Viro8365a712015-12-24 00:08:06 -05001363 page = memdup_user_nul(buf, count);
1364 if (IS_ERR(page))
1365 return PTR_ERR(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
Eric Parisb77a4932010-11-23 11:40:08 -05001367 ret = -EINVAL;
1368 if (sscanf(page, "%u", &new_value) != 1)
1369 goto out;
1370
1371 avc_cache_threshold = new_value;
1372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 ret = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374out:
Al Viro8365a712015-12-24 00:08:06 -05001375 kfree(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 return ret;
1377}
1378
1379static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1380 size_t count, loff_t *ppos)
1381{
1382 char *page;
Eric Parisb77a4932010-11-23 11:40:08 -05001383 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001386 if (!page)
1387 return -ENOMEM;
1388
1389 length = avc_get_hash_stats(page);
1390 if (length >= 0)
1391 length = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001393
1394 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395}
1396
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001397static const struct file_operations sel_avc_cache_threshold_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 .read = sel_read_avc_cache_threshold,
1399 .write = sel_write_avc_cache_threshold,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001400 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401};
1402
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001403static const struct file_operations sel_avc_hash_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 .read = sel_read_avc_hash_stats,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001405 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406};
1407
1408#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1409static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1410{
1411 int cpu;
1412
Rusty Russell4f4b6c12009-01-01 10:12:15 +10301413 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 if (!cpu_possible(cpu))
1415 continue;
1416 *idx = cpu + 1;
1417 return &per_cpu(avc_cache_stats, cpu);
1418 }
1419 return NULL;
1420}
1421
1422static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1423{
1424 loff_t n = *pos - 1;
1425
1426 if (*pos == 0)
1427 return SEQ_START_TOKEN;
1428
1429 return sel_avc_get_stat_idx(&n);
1430}
1431
1432static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1433{
1434 return sel_avc_get_stat_idx(pos);
1435}
1436
1437static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1438{
1439 struct avc_cache_stats *st = v;
1440
1441 if (v == SEQ_START_TOKEN)
1442 seq_printf(seq, "lookups hits misses allocations reclaims "
1443 "frees\n");
Linus Torvalds257313b2011-05-19 21:22:53 -07001444 else {
1445 unsigned int lookups = st->lookups;
1446 unsigned int misses = st->misses;
1447 unsigned int hits = lookups - misses;
1448 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1449 hits, misses, st->allocations,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 st->reclaims, st->frees);
Linus Torvalds257313b2011-05-19 21:22:53 -07001451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 return 0;
1453}
1454
1455static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1456{ }
1457
Jan Engelhardt1996a102008-01-23 00:02:58 +01001458static const struct seq_operations sel_avc_cache_stats_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 .start = sel_avc_stats_seq_start,
1460 .next = sel_avc_stats_seq_next,
1461 .show = sel_avc_stats_seq_show,
1462 .stop = sel_avc_stats_seq_stop,
1463};
1464
1465static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1466{
1467 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1468}
1469
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001470static const struct file_operations sel_avc_cache_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 .open = sel_open_avc_cache_stats,
1472 .read = seq_read,
1473 .llseek = seq_lseek,
1474 .release = seq_release,
1475};
1476#endif
1477
1478static int sel_make_avc_files(struct dentry *dir)
1479{
Eric Parisb77a4932010-11-23 11:40:08 -05001480 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 static struct tree_descr files[] = {
1482 { "cache_threshold",
1483 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1484 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1485#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1486 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1487#endif
1488 };
1489
Nicolas Kaiser6e20a642006-01-06 00:11:22 -08001490 for (i = 0; i < ARRAY_SIZE(files); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 struct inode *inode;
1492 struct dentry *dentry;
1493
1494 dentry = d_alloc_name(dir, files[i].name);
Eric Parisb77a4932010-11-23 11:40:08 -05001495 if (!dentry)
1496 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
1498 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
Eric Parisb77a4932010-11-23 11:40:08 -05001499 if (!inode)
1500 return -ENOMEM;
1501
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 inode->i_fop = files[i].ops;
James Carter6174eaf2007-04-04 16:18:39 -04001503 inode->i_ino = ++sel_last_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 d_add(dentry, inode);
1505 }
Eric Parisb77a4932010-11-23 11:40:08 -05001506
1507 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508}
1509
Eric Paris18729812008-04-17 14:15:45 -04001510static ssize_t sel_read_initcon(struct file *file, char __user *buf,
James Carterf0ee2e42007-04-04 10:11:29 -04001511 size_t count, loff_t *ppos)
1512{
James Carterf0ee2e42007-04-04 10:11:29 -04001513 char *con;
1514 u32 sid, len;
1515 ssize_t ret;
1516
Al Viro496ad9a2013-01-23 17:07:38 -05001517 sid = file_inode(file)->i_ino&SEL_INO_MASK;
James Carterf0ee2e42007-04-04 10:11:29 -04001518 ret = security_sid_to_context(sid, &con, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001519 if (ret)
James Carterf0ee2e42007-04-04 10:11:29 -04001520 return ret;
1521
1522 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1523 kfree(con);
1524 return ret;
1525}
1526
1527static const struct file_operations sel_initcon_ops = {
1528 .read = sel_read_initcon,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001529 .llseek = generic_file_llseek,
James Carterf0ee2e42007-04-04 10:11:29 -04001530};
1531
1532static int sel_make_initcon_files(struct dentry *dir)
1533{
Eric Parisb77a4932010-11-23 11:40:08 -05001534 int i;
James Carterf0ee2e42007-04-04 10:11:29 -04001535
1536 for (i = 1; i <= SECINITSID_NUM; i++) {
1537 struct inode *inode;
1538 struct dentry *dentry;
1539 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
Eric Parisb77a4932010-11-23 11:40:08 -05001540 if (!dentry)
1541 return -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001542
1543 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001544 if (!inode)
1545 return -ENOMEM;
1546
James Carterf0ee2e42007-04-04 10:11:29 -04001547 inode->i_fop = &sel_initcon_ops;
1548 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1549 d_add(dentry, inode);
1550 }
Eric Parisb77a4932010-11-23 11:40:08 -05001551
1552 return 0;
James Carterf0ee2e42007-04-04 10:11:29 -04001553}
1554
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001555static inline unsigned long sel_class_to_ino(u16 class)
1556{
1557 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1558}
1559
1560static inline u16 sel_ino_to_class(unsigned long ino)
1561{
Eric Paris92ae9e82012-04-04 13:46:46 -04001562 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001563}
1564
1565static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1566{
1567 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1568}
1569
1570static inline u32 sel_ino_to_perm(unsigned long ino)
1571{
1572 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1573}
1574
Eric Paris18729812008-04-17 14:15:45 -04001575static ssize_t sel_read_class(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001576 size_t count, loff_t *ppos)
1577{
Al Viro496ad9a2013-01-23 17:07:38 -05001578 unsigned long ino = file_inode(file)->i_ino;
Al Virocc1dad72012-04-02 19:40:47 -04001579 char res[TMPBUFLEN];
1580 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1581 return simple_read_from_buffer(buf, count, ppos, res, len);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001582}
1583
1584static const struct file_operations sel_class_ops = {
1585 .read = sel_read_class,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001586 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001587};
1588
Eric Paris18729812008-04-17 14:15:45 -04001589static ssize_t sel_read_perm(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001590 size_t count, loff_t *ppos)
1591{
Al Viro496ad9a2013-01-23 17:07:38 -05001592 unsigned long ino = file_inode(file)->i_ino;
Al Virocc1dad72012-04-02 19:40:47 -04001593 char res[TMPBUFLEN];
1594 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1595 return simple_read_from_buffer(buf, count, ppos, res, len);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001596}
1597
1598static const struct file_operations sel_perm_ops = {
1599 .read = sel_read_perm,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001600 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001601};
1602
Paul Moore3bb56b22008-01-29 08:38:19 -05001603static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1604 size_t count, loff_t *ppos)
1605{
1606 int value;
1607 char tmpbuf[TMPBUFLEN];
1608 ssize_t length;
Al Viro496ad9a2013-01-23 17:07:38 -05001609 unsigned long i_ino = file_inode(file)->i_ino;
Paul Moore3bb56b22008-01-29 08:38:19 -05001610
1611 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1612 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1613
1614 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1615}
1616
1617static const struct file_operations sel_policycap_ops = {
1618 .read = sel_read_policycap,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001619 .llseek = generic_file_llseek,
Paul Moore3bb56b22008-01-29 08:38:19 -05001620};
1621
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001622static int sel_make_perm_files(char *objclass, int classvalue,
1623 struct dentry *dir)
1624{
Eric Parisb77a4932010-11-23 11:40:08 -05001625 int i, rc, nperms;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001626 char **perms;
1627
1628 rc = security_get_permissions(objclass, &perms, &nperms);
1629 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001630 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001631
1632 for (i = 0; i < nperms; i++) {
1633 struct inode *inode;
1634 struct dentry *dentry;
1635
Eric Parisb77a4932010-11-23 11:40:08 -05001636 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001637 dentry = d_alloc_name(dir, perms[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001638 if (!dentry)
1639 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001640
Eric Parisb77a4932010-11-23 11:40:08 -05001641 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001642 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001643 if (!inode)
1644 goto out;
1645
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001646 inode->i_fop = &sel_perm_ops;
1647 /* i+1 since perm values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001648 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001649 d_add(dentry, inode);
1650 }
Eric Parisb77a4932010-11-23 11:40:08 -05001651 rc = 0;
1652out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001653 for (i = 0; i < nperms; i++)
1654 kfree(perms[i]);
1655 kfree(perms);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001656 return rc;
1657}
1658
1659static int sel_make_class_dir_entries(char *classname, int index,
1660 struct dentry *dir)
1661{
1662 struct dentry *dentry = NULL;
1663 struct inode *inode = NULL;
1664 int rc;
1665
1666 dentry = d_alloc_name(dir, "index");
Eric Parisb77a4932010-11-23 11:40:08 -05001667 if (!dentry)
1668 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001669
1670 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001671 if (!inode)
1672 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001673
1674 inode->i_fop = &sel_class_ops;
1675 inode->i_ino = sel_class_to_ino(index);
1676 d_add(dentry, inode);
1677
Al Viroa1c2aa12012-03-18 20:36:59 -04001678 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1679 if (IS_ERR(dentry))
1680 return PTR_ERR(dentry);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001681
1682 rc = sel_make_perm_files(classname, index, dentry);
1683
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001684 return rc;
1685}
1686
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001687static int sel_make_classes(void)
1688{
Eric Parisb77a4932010-11-23 11:40:08 -05001689 int rc, nclasses, i;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001690 char **classes;
1691
1692 /* delete any existing entries */
Al Viroad521842014-12-24 14:56:48 -05001693 sel_remove_entries(class_dir);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001694
1695 rc = security_get_classes(&classes, &nclasses);
Eric Parisb77a4932010-11-23 11:40:08 -05001696 if (rc)
1697 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001698
1699 /* +2 since classes are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001700 last_class_ino = sel_class_to_ino(nclasses + 2);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001701
1702 for (i = 0; i < nclasses; i++) {
1703 struct dentry *class_name_dir;
1704
Al Viroa1c2aa12012-03-18 20:36:59 -04001705 class_name_dir = sel_make_dir(class_dir, classes[i],
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001706 &last_class_ino);
Al Viroa1c2aa12012-03-18 20:36:59 -04001707 if (IS_ERR(class_name_dir)) {
1708 rc = PTR_ERR(class_name_dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001709 goto out;
Al Viroa1c2aa12012-03-18 20:36:59 -04001710 }
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001711
1712 /* i+1 since class values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001713 rc = sel_make_class_dir_entries(classes[i], i + 1,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001714 class_name_dir);
1715 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001716 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001717 }
Eric Parisb77a4932010-11-23 11:40:08 -05001718 rc = 0;
1719out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001720 for (i = 0; i < nclasses; i++)
1721 kfree(classes[i]);
1722 kfree(classes);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001723 return rc;
1724}
1725
Paul Moore3bb56b22008-01-29 08:38:19 -05001726static int sel_make_policycap(void)
1727{
1728 unsigned int iter;
1729 struct dentry *dentry = NULL;
1730 struct inode *inode = NULL;
1731
1732 sel_remove_entries(policycap_dir);
1733
1734 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1735 if (iter < ARRAY_SIZE(policycap_names))
1736 dentry = d_alloc_name(policycap_dir,
1737 policycap_names[iter]);
1738 else
1739 dentry = d_alloc_name(policycap_dir, "unknown");
1740
1741 if (dentry == NULL)
1742 return -ENOMEM;
1743
1744 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1745 if (inode == NULL)
1746 return -ENOMEM;
1747
1748 inode->i_fop = &sel_policycap_ops;
1749 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1750 d_add(dentry, inode);
1751 }
1752
1753 return 0;
1754}
1755
Al Viroa1c2aa12012-03-18 20:36:59 -04001756static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001757 unsigned long *ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001758{
Al Viroa1c2aa12012-03-18 20:36:59 -04001759 struct dentry *dentry = d_alloc_name(dir, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760 struct inode *inode;
1761
Al Viroa1c2aa12012-03-18 20:36:59 -04001762 if (!dentry)
1763 return ERR_PTR(-ENOMEM);
1764
1765 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1766 if (!inode) {
1767 dput(dentry);
1768 return ERR_PTR(-ENOMEM);
1769 }
Eric Parisb77a4932010-11-23 11:40:08 -05001770
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 inode->i_op = &simple_dir_inode_operations;
1772 inode->i_fop = &simple_dir_operations;
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001773 inode->i_ino = ++(*ino);
James Morris40e906f2006-03-22 00:09:16 -08001774 /* directory inodes start off with i_nlink == 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -07001775 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 d_add(dentry, inode);
James Morrisedb20fb2006-03-22 00:09:20 -08001777 /* bump link count on parent directory, too */
David Howellsce0b16d2015-02-19 10:47:02 +00001778 inc_nlink(d_inode(dir));
Eric Parisb77a4932010-11-23 11:40:08 -05001779
Al Viroa1c2aa12012-03-18 20:36:59 -04001780 return dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781}
1782
Eric Paris18729812008-04-17 14:15:45 -04001783static int sel_fill_super(struct super_block *sb, void *data, int silent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784{
1785 int ret;
1786 struct dentry *dentry;
Al Viroa1c2aa12012-03-18 20:36:59 -04001787 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 struct inode_security_struct *isec;
1789
1790 static struct tree_descr selinux_files[] = {
1791 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1792 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
Stephen Smalleyce9982d2005-11-08 21:34:33 -08001793 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1795 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1799 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1800 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1801 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1802 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
Eric Paris3f120702007-09-21 14:37:10 -04001804 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1805 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
KaiGai Kohei11904162010-09-14 18:28:39 +09001806 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
Eric Paris72e8c8592012-02-16 15:08:39 -05001807 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
Andrew Perepechkof9df6452015-12-24 11:09:41 -05001808 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1809 S_IWUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 /* last one */ {""}
1811 };
1812 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1813 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001814 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815
Al Viroa1c2aa12012-03-18 20:36:59 -04001816 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1817 if (IS_ERR(bool_dir)) {
1818 ret = PTR_ERR(bool_dir);
1819 bool_dir = NULL;
James Morris161ce452006-03-22 00:09:17 -08001820 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001821 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822
Eric Parisb77a4932010-11-23 11:40:08 -05001823 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001825 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001826 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827
Eric Parisb77a4932010-11-23 11:40:08 -05001828 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001830 if (!inode)
James Morris161ce452006-03-22 00:09:17 -08001831 goto err;
Eric Parisb77a4932010-11-23 11:40:08 -05001832
James Carter6174eaf2007-04-04 16:18:39 -04001833 inode->i_ino = ++sel_last_ino;
Eric Paris18729812008-04-17 14:15:45 -04001834 isec = (struct inode_security_struct *)inode->i_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 isec->sid = SECINITSID_DEVNULL;
1836 isec->sclass = SECCLASS_CHR_FILE;
1837 isec->initialized = 1;
1838
1839 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1840 d_add(dentry, inode);
Al Viro765927b2012-06-26 21:58:53 +04001841 selinux_null.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
Al Viroa1c2aa12012-03-18 20:36:59 -04001843 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1844 if (IS_ERR(dentry)) {
1845 ret = PTR_ERR(dentry);
James Morris161ce452006-03-22 00:09:17 -08001846 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001847 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848
1849 ret = sel_make_avc_files(dentry);
1850 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001851 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001852
Al Viroa1c2aa12012-03-18 20:36:59 -04001853 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1854 if (IS_ERR(dentry)) {
1855 ret = PTR_ERR(dentry);
James Carterf0ee2e42007-04-04 10:11:29 -04001856 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001857 }
James Carterf0ee2e42007-04-04 10:11:29 -04001858
1859 ret = sel_make_initcon_files(dentry);
1860 if (ret)
1861 goto err;
1862
Al Viroa1c2aa12012-03-18 20:36:59 -04001863 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1864 if (IS_ERR(class_dir)) {
1865 ret = PTR_ERR(class_dir);
1866 class_dir = NULL;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001867 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001868 }
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001869
Al Viroa1c2aa12012-03-18 20:36:59 -04001870 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1871 if (IS_ERR(policycap_dir)) {
1872 ret = PTR_ERR(policycap_dir);
1873 policycap_dir = NULL;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001874 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001875 }
Eric Parisb77a4932010-11-23 11:40:08 -05001876 return 0;
James Morris161ce452006-03-22 00:09:17 -08001877err:
Eric Paris744ba352008-04-17 11:52:44 -04001878 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1879 __func__);
Eric Parisb77a4932010-11-23 11:40:08 -05001880 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881}
1882
Al Virofc14f2f2010-07-25 01:48:30 +04001883static struct dentry *sel_mount(struct file_system_type *fs_type,
1884 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885{
Al Virofc14f2f2010-07-25 01:48:30 +04001886 return mount_single(fs_type, flags, data, sel_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887}
1888
1889static struct file_system_type sel_fs_type = {
1890 .name = "selinuxfs",
Al Virofc14f2f2010-07-25 01:48:30 +04001891 .mount = sel_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 .kill_sb = kill_litter_super,
1893};
1894
1895struct vfsmount *selinuxfs_mount;
1896
1897static int __init init_sel_fs(void)
1898{
1899 int err;
1900
1901 if (!selinux_enabled)
1902 return 0;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001903
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001904 err = sysfs_create_mount_point(fs_kobj, "selinux");
1905 if (err)
1906 return err;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001907
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 err = register_filesystem(&sel_fs_type);
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001909 if (err) {
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001910 sysfs_remove_mount_point(fs_kobj, "selinux");
Eric Parisb77a4932010-11-23 11:40:08 -05001911 return err;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001912 }
Eric Parisb77a4932010-11-23 11:40:08 -05001913
Al Viro765927b2012-06-26 21:58:53 +04001914 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
Eric Parisb77a4932010-11-23 11:40:08 -05001915 if (IS_ERR(selinuxfs_mount)) {
1916 printk(KERN_ERR "selinuxfs: could not mount!\n");
1917 err = PTR_ERR(selinuxfs_mount);
1918 selinuxfs_mount = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919 }
Eric Parisb77a4932010-11-23 11:40:08 -05001920
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 return err;
1922}
1923
1924__initcall(init_sel_fs);
1925
1926#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1927void exit_sel_fs(void)
1928{
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001929 sysfs_remove_mount_point(fs_kobj, "selinux");
Tim Chen423e0ab2011-07-19 09:32:38 -07001930 kern_unmount(selinuxfs_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 unregister_filesystem(&sel_fs_type);
1932}
1933#endif