blob: 3d22014130289d2904dee4fb3c831223437864d2 [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",
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 Molnarbb003072006-03-22 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 */
James Carter6174eaf2007-04-04 16:18:39 -0400119 SEL_INO_NEXT, /* The next inode number to use */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120};
121
James Carter6174eaf2007-04-04 16:18:39 -0400122static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
123
Paul Moore3bb56b22008-01-29 08:38:19 -0500124#define SEL_INITCON_INO_OFFSET 0x01000000
125#define SEL_BOOL_INO_OFFSET 0x02000000
126#define SEL_CLASS_INO_OFFSET 0x04000000
127#define SEL_POLICYCAP_INO_OFFSET 0x08000000
128#define SEL_INO_MASK 0x00ffffff
James Carterf0ee2e42007-04-04 10:11:29 -0400129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#define TMPBUFLEN 12
131static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
132 size_t count, loff_t *ppos)
133{
134 char tmpbuf[TMPBUFLEN];
135 ssize_t length;
136
137 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
138 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
139}
140
141#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
Eric Paris18729812008-04-17 14:15:45 -0400142static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 size_t count, loff_t *ppos)
144
145{
Eric Parisb77a4932010-11-23 11:40:08 -0500146 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 ssize_t length;
148 int new_value;
149
Eric Parisb77a4932010-11-23 11:40:08 -0500150 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800151 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500152 goto out;
153
154 /* No partial writes. */
Joe Perches6436a122015-03-23 18:01:35 -0700155 length = -EINVAL;
Eric Parisb77a4932010-11-23 11:40:08 -0500156 if (*ppos != 0)
157 goto out;
158
159 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400160 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500162 goto out;
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 length = -EFAULT;
165 if (copy_from_user(page, buf, count))
166 goto out;
167
168 length = -EINVAL;
169 if (sscanf(page, "%d", &new_value) != 1)
170 goto out;
171
172 if (new_value != selinux_enforcing) {
173 length = task_has_security(current, SECURITY__SETENFORCE);
174 if (length)
175 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000176 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500177 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
178 new_value, selinux_enforcing,
Eric W. Biederman581abc02012-08-20 00:09:36 -0700179 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500180 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 selinux_enforcing = new_value;
182 if (selinux_enforcing)
183 avc_ss_reset(0);
184 selnl_notify_setenforce(selinux_enforcing);
KaiGai Kohei11904162010-09-14 18:28:39 +0900185 selinux_status_update_setenforce(selinux_enforcing);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187 length = count;
188out:
189 free_page((unsigned long) page);
190 return length;
191}
192#else
193#define sel_write_enforce NULL
194#endif
195
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800196static const struct file_operations sel_enforce_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200199 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200};
201
Eric Paris3f120702007-09-21 14:37:10 -0400202static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
204{
205 char tmpbuf[TMPBUFLEN];
206 ssize_t length;
Al Viro496ad9a2013-01-23 17:07:38 -0500207 ino_t ino = file_inode(filp)->i_ino;
Eric Paris3f120702007-09-21 14:37:10 -0400208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213}
214
215static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200217 .llseek = generic_file_llseek,
Eric Paris3f120702007-09-21 14:37:10 -0400218};
219
KaiGai Kohei11904162010-09-14 18:28:39 +0900220static int sel_open_handle_status(struct inode *inode, struct file *filp)
221{
222 struct page *status = selinux_kernel_status_page();
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230}
231
232static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234{
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242}
243
244static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246{
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264}
265
266static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271};
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273#ifdef CONFIG_SECURITY_SELINUX_DISABLE
Eric Paris18729812008-04-17 14:15:45 -0400274static ssize_t sel_write_disable(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 size_t count, loff_t *ppos)
276
277{
Eric Parisb77a4932010-11-23 11:40:08 -0500278 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 ssize_t length;
280 int new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Eric Parisb77a4932010-11-23 11:40:08 -0500282 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800283 if (count >= PAGE_SIZE)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700284 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500285
286 /* No partial writes. */
287 length = -EINVAL;
288 if (*ppos != 0)
289 goto out;
290
291 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400292 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500294 goto out;
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 length = -EFAULT;
297 if (copy_from_user(page, buf, count))
298 goto out;
299
300 length = -EINVAL;
301 if (sscanf(page, "%d", &new_value) != 1)
302 goto out;
303
304 if (new_value) {
305 length = selinux_disable();
Eric Parisb77a4932010-11-23 11:40:08 -0500306 if (length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 goto out;
Steve Grubbaf601e42006-01-04 14:08:39 +0000308 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
Eric Paris4746ec52008-01-08 10:06:53 -0500309 "selinux=0 auid=%u ses=%u",
Eric W. Biederman581abc02012-08-20 00:09:36 -0700310 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500311 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313
314 length = count;
315out:
316 free_page((unsigned long) page);
317 return length;
318}
319#else
320#define sel_write_disable NULL
321#endif
322
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800323static const struct file_operations sel_disable_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 .write = sel_write_disable,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200325 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326};
327
328static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
Eric Paris18729812008-04-17 14:15:45 -0400329 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 char tmpbuf[TMPBUFLEN];
332 ssize_t length;
333
334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
335 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
336}
337
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800338static const struct file_operations sel_policyvers_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .read = sel_read_policyvers,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200340 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341};
342
343/* declaration for sel_write_load */
344static int sel_make_bools(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400345static int sel_make_classes(void);
Paul Moore3bb56b22008-01-29 08:38:19 -0500346static int sel_make_policycap(void);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400347
348/* declaration for sel_make_class_dirs */
Al Viroa1c2aa12012-03-18 20:36:59 -0400349static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400350 unsigned long *ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352static ssize_t sel_read_mls(struct file *filp, char __user *buf,
353 size_t count, loff_t *ppos)
354{
355 char tmpbuf[TMPBUFLEN];
356 ssize_t length;
357
Guido Trentalancia0719aaf2010-02-03 16:40:20 +0100358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled());
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
361}
362
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800363static const struct file_operations sel_mls_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 .read = sel_read_mls,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200365 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366};
367
Eric Pariscee74f42010-10-13 17:50:25 -0400368struct policy_load_memory {
369 size_t len;
370 void *data;
371};
372
373static int sel_open_policy(struct inode *inode, struct file *filp)
374{
375 struct policy_load_memory *plm = NULL;
376 int rc;
377
378 BUG_ON(filp->private_data);
379
380 mutex_lock(&sel_mutex);
381
382 rc = task_has_security(current, SECURITY__READ_POLICY);
383 if (rc)
384 goto err;
385
386 rc = -EBUSY;
387 if (policy_opened)
388 goto err;
389
390 rc = -ENOMEM;
391 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
392 if (!plm)
393 goto err;
394
395 if (i_size_read(inode) != security_policydb_len()) {
396 mutex_lock(&inode->i_mutex);
397 i_size_write(inode, security_policydb_len());
398 mutex_unlock(&inode->i_mutex);
399 }
400
401 rc = security_read_policy(&plm->data, &plm->len);
402 if (rc)
403 goto err;
404
405 policy_opened = 1;
406
407 filp->private_data = plm;
408
409 mutex_unlock(&sel_mutex);
410
411 return 0;
412err:
413 mutex_unlock(&sel_mutex);
414
415 if (plm)
416 vfree(plm->data);
417 kfree(plm);
418 return rc;
419}
420
421static int sel_release_policy(struct inode *inode, struct file *filp)
422{
423 struct policy_load_memory *plm = filp->private_data;
424
425 BUG_ON(!plm);
426
427 policy_opened = 0;
428
429 vfree(plm->data);
430 kfree(plm);
431
432 return 0;
433}
434
435static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
437{
438 struct policy_load_memory *plm = filp->private_data;
439 int ret;
440
441 mutex_lock(&sel_mutex);
442
443 ret = task_has_security(current, SECURITY__READ_POLICY);
444 if (ret)
445 goto out;
446
447 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
448out:
449 mutex_unlock(&sel_mutex);
450 return ret;
451}
452
Eric Paris845ca302010-10-13 17:50:31 -0400453static int sel_mmap_policy_fault(struct vm_area_struct *vma,
454 struct vm_fault *vmf)
455{
456 struct policy_load_memory *plm = vma->vm_file->private_data;
457 unsigned long offset;
458 struct page *page;
459
460 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
461 return VM_FAULT_SIGBUS;
462
463 offset = vmf->pgoff << PAGE_SHIFT;
464 if (offset >= roundup(plm->len, PAGE_SIZE))
465 return VM_FAULT_SIGBUS;
466
467 page = vmalloc_to_page(plm->data + offset);
468 get_page(page);
469
470 vmf->page = page;
471
472 return 0;
473}
474
475static struct vm_operations_struct sel_mmap_policy_ops = {
476 .fault = sel_mmap_policy_fault,
477 .page_mkwrite = sel_mmap_policy_fault,
478};
479
James Morrisad3fa082011-08-30 10:50:12 +1000480static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
Eric Paris845ca302010-10-13 17:50:31 -0400481{
482 if (vma->vm_flags & VM_SHARED) {
483 /* do not allow mprotect to make mapping writable */
484 vma->vm_flags &= ~VM_MAYWRITE;
485
486 if (vma->vm_flags & VM_WRITE)
487 return -EACCES;
488 }
489
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -0700490 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
Eric Paris845ca302010-10-13 17:50:31 -0400491 vma->vm_ops = &sel_mmap_policy_ops;
492
493 return 0;
494}
495
Eric Pariscee74f42010-10-13 17:50:25 -0400496static const struct file_operations sel_policy_ops = {
497 .open = sel_open_policy,
498 .read = sel_read_policy,
Eric Paris845ca302010-10-13 17:50:31 -0400499 .mmap = sel_mmap_policy,
Eric Pariscee74f42010-10-13 17:50:25 -0400500 .release = sel_release_policy,
Eric Paris47a93a52012-02-16 15:08:39 -0500501 .llseek = generic_file_llseek,
Eric Pariscee74f42010-10-13 17:50:25 -0400502};
503
Eric Paris18729812008-04-17 14:15:45 -0400504static ssize_t sel_write_load(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 size_t count, loff_t *ppos)
506
507{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 ssize_t length;
509 void *data = NULL;
510
Ingo Molnarbb003072006-03-22 00:09:14 -0800511 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 length = task_has_security(current, SECURITY__LOAD_POLICY);
514 if (length)
515 goto out;
516
Eric Parisb77a4932010-11-23 11:40:08 -0500517 /* No partial writes. */
518 length = -EINVAL;
519 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Eric Parisb77a4932010-11-23 11:40:08 -0500522 length = -EFBIG;
523 if (count > 64 * 1024 * 1024)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -0500525
526 length = -ENOMEM;
527 data = vmalloc(count);
528 if (!data)
529 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 length = -EFAULT;
532 if (copy_from_user(data, buf, count) != 0)
533 goto out;
534
535 length = security_load_policy(data, count);
536 if (length)
537 goto out;
538
Eric Parisb77a4932010-11-23 11:40:08 -0500539 length = sel_make_bools();
540 if (length)
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400541 goto out1;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400542
Eric Parisb77a4932010-11-23 11:40:08 -0500543 length = sel_make_classes();
544 if (length)
Paul Moore3bb56b22008-01-29 08:38:19 -0500545 goto out1;
Paul Moore3bb56b22008-01-29 08:38:19 -0500546
Eric Parisb77a4932010-11-23 11:40:08 -0500547 length = sel_make_policycap();
548 if (length)
549 goto out1;
550
551 length = count;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -0400552
553out1:
Steve Grubbaf601e42006-01-04 14:08:39 +0000554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
Eric Paris4746ec52008-01-08 10:06:53 -0500555 "policy loaded auid=%u ses=%u",
Eric W. Biederman581abc02012-08-20 00:09:36 -0700556 from_kuid(&init_user_ns, audit_get_loginuid(current)),
Eric Paris4746ec52008-01-08 10:06:53 -0500557 audit_get_sessionid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558out:
Ingo Molnarbb003072006-03-22 00:09:14 -0800559 mutex_unlock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 vfree(data);
561 return length;
562}
563
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800564static const struct file_operations sel_load_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 .write = sel_write_load,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200566 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567};
568
Eric Paris18729812008-04-17 14:15:45 -0400569static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
Eric Parisb77a4932010-11-23 11:40:08 -0500571 char *canon = NULL;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800572 u32 sid, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 ssize_t length;
574
575 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
576 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500577 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100579 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500580 if (length)
581 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800583 length = security_sid_to_context(sid, &canon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500584 if (length)
585 goto out;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800586
Eric Parisb77a4932010-11-23 11:40:08 -0500587 length = -ERANGE;
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800588 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800591 goto out;
592 }
593
594 memcpy(buf, canon, len);
595 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596out:
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800597 kfree(canon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 return length;
599}
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
602 size_t count, loff_t *ppos)
603{
604 char tmpbuf[TMPBUFLEN];
605 ssize_t length;
606
607 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
608 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
609}
610
Eric Paris18729812008-04-17 14:15:45 -0400611static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 size_t count, loff_t *ppos)
613{
Eric Parisb77a4932010-11-23 11:40:08 -0500614 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 ssize_t length;
616 unsigned int new_value;
617
618 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
619 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500620 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Eric Parisb77a4932010-11-23 11:40:08 -0500622 length = -ENOMEM;
Davi Arnautbfd51622005-10-30 14:59:24 -0800623 if (count >= PAGE_SIZE)
Eric Parisb77a4932010-11-23 11:40:08 -0500624 goto out;
625
626 /* No partial writes. */
627 length = -EINVAL;
628 if (*ppos != 0)
629 goto out;
630
631 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -0400632 page = (char *)get_zeroed_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -0500634 goto out;
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 length = -EFAULT;
637 if (copy_from_user(page, buf, count))
638 goto out;
639
640 length = -EINVAL;
641 if (sscanf(page, "%u", &new_value) != 1)
642 goto out;
643
644 selinux_checkreqprot = new_value ? 1 : 0;
645 length = count;
646out:
647 free_page((unsigned long) page);
648 return length;
649}
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800650static const struct file_operations sel_checkreqprot_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 .read = sel_read_checkreqprot,
652 .write = sel_write_checkreqprot,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200653 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654};
655
656/*
657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
658 */
Eric Paris18729812008-04-17 14:15:45 -0400659static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664
665static ssize_t (*write_op[])(struct file *, char *, size_t) = {
666 [SEL_ACCESS] = sel_write_access,
667 [SEL_CREATE] = sel_write_create,
668 [SEL_RELABEL] = sel_write_relabel,
669 [SEL_USER] = sel_write_user,
670 [SEL_MEMBER] = sel_write_member,
Stephen Smalleyce9982d2005-11-08 21:34:33 -0800671 [SEL_CONTEXT] = sel_write_context,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672};
673
674static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
675{
Al Viro496ad9a2013-01-23 17:07:38 -0500676 ino_t ino = file_inode(file)->i_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 char *data;
678 ssize_t rv;
679
Nicolas Kaiser6e20a642006-01-06 00:11:22 -0800680 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 return -EINVAL;
682
683 data = simple_transaction_get(file, buf, size);
684 if (IS_ERR(data))
685 return PTR_ERR(data);
686
Eric Paris18729812008-04-17 14:15:45 -0400687 rv = write_op[ino](file, data, size);
688 if (rv > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 simple_transaction_set(file, rv);
690 rv = size;
691 }
692 return rv;
693}
694
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -0800695static const struct file_operations transaction_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 .write = selinux_transaction_write,
697 .read = simple_transaction_read,
698 .release = simple_transaction_release,
Arnd Bergmann57a62c22010-07-07 23:40:10 +0200699 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700};
701
702/*
703 * payload - write methods
704 * If the method has a response, the response should be put in buf,
705 * and the length returned. Otherwise return 0 or and -error.
706 */
707
Eric Paris18729812008-04-17 14:15:45 -0400708static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Eric Parisb77a4932010-11-23 11:40:08 -0500710 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 u32 ssid, tsid;
712 u16 tclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 struct av_decision avd;
714 ssize_t length;
715
716 length = task_has_security(current, SECURITY__COMPUTE_AV);
717 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500718 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800721 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500723 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
Eric Parisb77a4932010-11-23 11:40:08 -0500725 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800726 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 if (!tcon)
728 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729
730 length = -EINVAL;
Stephen Smalley19439d02010-01-14 17:28:10 -0500731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500732 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100734 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
735 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500736 if (length)
737 goto out;
738
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100739 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
740 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500741 if (length)
742 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Stephen Smalley19439d02010-01-14 17:28:10 -0500744 security_compute_av_user(ssid, tsid, tclass, &avd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900747 "%x %x %x %x %u %x",
Eric Parisf1c63812009-02-12 14:50:54 -0500748 avd.allowed, 0xffffffff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 avd.auditallow, avd.auditdeny,
KaiGai Kohei8a6f83a2009-04-01 10:07:57 +0900750 avd.seqno, avd.flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751out:
Eric Parisb77a4932010-11-23 11:40:08 -0500752 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 kfree(scon);
754 return length;
755}
756
Eric Paris18729812008-04-17 14:15:45 -0400757static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Eric Parisb77a4932010-11-23 11:40:08 -0500759 char *scon = NULL, *tcon = NULL;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100760 char *namebuf = NULL, *objname = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 u32 ssid, tsid, newsid;
762 u16 tclass;
763 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500764 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 u32 len;
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100766 int nargs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
768 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
769 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500770 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
772 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800773 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500775 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Eric Parisb77a4932010-11-23 11:40:08 -0500777 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800778 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 if (!tcon)
780 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100782 length = -ENOMEM;
783 namebuf = kzalloc(size + 1, GFP_KERNEL);
784 if (!namebuf)
Eric Parisb77a4932010-11-23 11:40:08 -0500785 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100787 length = -EINVAL;
788 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
789 if (nargs < 3 || nargs > 4)
790 goto out;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400791 if (nargs == 4) {
792 /*
793 * If and when the name of new object to be queried contains
794 * either whitespace or multibyte characters, they shall be
795 * encoded based on the percentage-encoding rule.
796 * If not encoded, the sscanf logic picks up only left-half
797 * of the supplied name; splitted by a whitespace unexpectedly.
798 */
799 char *r, *w;
800 int c1, c2;
801
802 r = w = namebuf;
803 do {
804 c1 = *r++;
805 if (c1 == '+')
806 c1 = ' ';
807 else if (c1 == '%') {
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800808 c1 = hex_to_bin(*r++);
809 if (c1 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400810 goto out;
Andy Shevchenkoaf7ff2c2011-11-15 15:11:41 -0800811 c2 = hex_to_bin(*r++);
812 if (c2 < 0)
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400813 goto out;
814 c1 = (c1 << 4) | c2;
815 }
816 *w++ = c1;
817 } while (c1 != '\0');
818
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100819 objname = namebuf;
Kohei Kaigai0f7e4c32011-05-26 14:59:25 -0400820 }
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100821
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100822 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
823 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500824 if (length)
825 goto out;
826
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100827 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
828 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500829 if (length)
830 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100832 length = security_transition_sid_user(ssid, tsid, tclass,
833 objname, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500834 if (length)
835 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
837 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500838 if (length)
839 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840
Eric Parisb77a4932010-11-23 11:40:08 -0500841 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -0400843 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
844 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -0500845 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 }
847
848 memcpy(buf, newcon, len);
849 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850out:
Eric Parisb77a4932010-11-23 11:40:08 -0500851 kfree(newcon);
Kohei Kaigaif50a3ec2011-04-01 15:39:26 +0100852 kfree(namebuf);
Eric Parisb77a4932010-11-23 11:40:08 -0500853 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 kfree(scon);
855 return length;
856}
857
Eric Paris18729812008-04-17 14:15:45 -0400858static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859{
Eric Parisb77a4932010-11-23 11:40:08 -0500860 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 u32 ssid, tsid, newsid;
862 u16 tclass;
863 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500864 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 u32 len;
866
867 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
868 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500869 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800872 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 if (!scon)
Eric Parisb77a4932010-11-23 11:40:08 -0500874 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Eric Parisb77a4932010-11-23 11:40:08 -0500876 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800877 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 if (!tcon)
879 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 length = -EINVAL;
882 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -0500883 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100885 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
886 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500887 if (length)
888 goto out;
889
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100890 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
891 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500892 if (length)
893 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
895 length = security_change_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -0500896 if (length)
897 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -0500900 if (length)
901 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902
Eric Parisb77a4932010-11-23 11:40:08 -0500903 length = -ERANGE;
904 if (len > SIMPLE_TRANSACTION_LIMIT)
905 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907 memcpy(buf, newcon, len);
908 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909out:
Eric Parisb77a4932010-11-23 11:40:08 -0500910 kfree(newcon);
911 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 kfree(scon);
913 return length;
914}
915
Eric Paris18729812008-04-17 14:15:45 -0400916static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
Eric Parisb77a4932010-11-23 11:40:08 -0500918 char *con = NULL, *user = NULL, *ptr;
919 u32 sid, *sids = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 ssize_t length;
921 char *newcon;
922 int i, rc;
923 u32 len, nsids;
924
925 length = task_has_security(current, SECURITY__COMPUTE_USER);
926 if (length)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700927 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800930 con = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 if (!con)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700932 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Eric Parisb77a4932010-11-23 11:40:08 -0500934 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800935 user = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 if (!user)
937 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
939 length = -EINVAL;
940 if (sscanf(buf, "%s %s", con, user) != 2)
Eric Parisb77a4932010-11-23 11:40:08 -0500941 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +0100943 length = security_context_to_sid(con, strlen(con) + 1, &sid, GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -0500944 if (length)
945 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
947 length = security_get_user_sids(sid, user, &sids, &nsids);
Eric Parisb77a4932010-11-23 11:40:08 -0500948 if (length)
949 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 length = sprintf(buf, "%u", nsids) + 1;
952 ptr = buf + length;
953 for (i = 0; i < nsids; i++) {
954 rc = security_sid_to_context(sids[i], &newcon, &len);
955 if (rc) {
956 length = rc;
Eric Parisb77a4932010-11-23 11:40:08 -0500957 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 }
959 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
960 kfree(newcon);
961 length = -ERANGE;
Eric Parisb77a4932010-11-23 11:40:08 -0500962 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 }
964 memcpy(ptr, newcon, len);
965 kfree(newcon);
966 ptr += len;
967 length += len;
968 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969out:
Eric Parisb77a4932010-11-23 11:40:08 -0500970 kfree(sids);
971 kfree(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 kfree(con);
973 return length;
974}
975
Eric Paris18729812008-04-17 14:15:45 -0400976static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977{
Eric Parisb77a4932010-11-23 11:40:08 -0500978 char *scon = NULL, *tcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 u32 ssid, tsid, newsid;
980 u16 tclass;
981 ssize_t length;
Eric Parisb77a4932010-11-23 11:40:08 -0500982 char *newcon = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 u32 len;
984
985 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
986 if (length)
Eric Parisb77a4932010-11-23 11:40:08 -0500987 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800990 scon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 if (!scon)
Justin P. Mattock6eab04a2011-04-08 19:49:08 -0700992 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
Eric Parisb77a4932010-11-23 11:40:08 -0500994 length = -ENOMEM;
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +0800995 tcon = kzalloc(size + 1, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 if (!tcon)
997 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 length = -EINVAL;
1000 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
Eric Parisb77a4932010-11-23 11:40:08 -05001001 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +01001003 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid,
1004 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001005 if (length)
1006 goto out;
1007
Nikolay Aleksandrov52a4c642014-03-07 12:44:19 +01001008 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid,
1009 GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001010 if (length)
1011 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
1013 length = security_member_sid(ssid, tsid, tclass, &newsid);
Eric Parisb77a4932010-11-23 11:40:08 -05001014 if (length)
1015 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016
1017 length = security_sid_to_context(newsid, &newcon, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001018 if (length)
1019 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Eric Parisb77a4932010-11-23 11:40:08 -05001021 length = -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 if (len > SIMPLE_TRANSACTION_LIMIT) {
Eric Paris744ba352008-04-17 11:52:44 -04001023 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1024 "payload max\n", __func__, len);
Eric Parisb77a4932010-11-23 11:40:08 -05001025 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 }
1027
1028 memcpy(buf, newcon, len);
1029 length = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030out:
Eric Parisb77a4932010-11-23 11:40:08 -05001031 kfree(newcon);
1032 kfree(tcon);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 kfree(scon);
1034 return length;
1035}
1036
1037static struct inode *sel_make_inode(struct super_block *sb, int mode)
1038{
1039 struct inode *ret = new_inode(sb);
1040
1041 if (ret) {
1042 ret->i_mode = mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1044 }
1045 return ret;
1046}
1047
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1049 size_t count, loff_t *ppos)
1050{
1051 char *page = NULL;
1052 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 ssize_t ret;
1054 int cur_enforcing;
Al Viro496ad9a2013-01-23 17:07:38 -05001055 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001056 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057
Ingo Molnarbb003072006-03-22 00:09:14 -08001058 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Eric Parisb77a4932010-11-23 11:40:08 -05001060 ret = -EINVAL;
1061 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001062 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
Eric Parisb77a4932010-11-23 11:40:08 -05001064 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001065 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001066 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001069 cur_enforcing = security_get_bool_value(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 if (cur_enforcing < 0) {
1071 ret = cur_enforcing;
1072 goto out;
1073 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001075 bool_pending_values[index]);
Stephen Smalley68bdcf22006-03-22 00:09:15 -08001076 ret = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001078 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001079 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 return ret;
1081}
1082
1083static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1084 size_t count, loff_t *ppos)
1085{
1086 char *page = NULL;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001087 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088 int new_value;
Al Viro496ad9a2013-01-23 17:07:38 -05001089 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001090 const char *name = filep->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Ingo Molnarbb003072006-03-22 00:09:14 -08001092 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094 length = task_has_security(current, SECURITY__SETBOOL);
1095 if (length)
1096 goto out;
1097
Eric Parisb77a4932010-11-23 11:40:08 -05001098 length = -EINVAL;
1099 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001100 goto out;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001101
Eric Parisb77a4932010-11-23 11:40:08 -05001102 length = -ENOMEM;
1103 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 goto out;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001105
Eric Parisb77a4932010-11-23 11:40:08 -05001106 /* No partial writes. */
1107 length = -EINVAL;
1108 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001110
1111 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001112 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001113 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001116 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 if (copy_from_user(page, buf, count))
1118 goto out;
1119
1120 length = -EINVAL;
1121 if (sscanf(page, "%d", &new_value) != 1)
1122 goto out;
1123
1124 if (new_value)
1125 new_value = 1;
1126
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001127 bool_pending_values[index] = new_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 length = count;
1129
1130out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001131 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001132 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 return length;
1134}
1135
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001136static const struct file_operations sel_bool_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001137 .read = sel_read_bool,
1138 .write = sel_write_bool,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001139 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140};
1141
1142static ssize_t sel_commit_bools_write(struct file *filep,
1143 const char __user *buf,
1144 size_t count, loff_t *ppos)
1145{
1146 char *page = NULL;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001147 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 int new_value;
1149
Ingo Molnarbb003072006-03-22 00:09:14 -08001150 mutex_lock(&sel_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
1152 length = task_has_security(current, SECURITY__SETBOOL);
1153 if (length)
1154 goto out;
1155
Eric Parisb77a4932010-11-23 11:40:08 -05001156 length = -ENOMEM;
1157 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001159
1160 /* No partial writes. */
1161 length = -EINVAL;
1162 if (*ppos != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 goto out;
Eric Parisb77a4932010-11-23 11:40:08 -05001164
1165 length = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001166 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001167 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001170 length = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 if (copy_from_user(page, buf, count))
1172 goto out;
1173
1174 length = -EINVAL;
1175 if (sscanf(page, "%d", &new_value) != 1)
1176 goto out;
1177
Eric Parisb77a4932010-11-23 11:40:08 -05001178 length = 0;
Eric Paris18729812008-04-17 14:15:45 -04001179 if (new_value && bool_pending_values)
Eric Parisb77a4932010-11-23 11:40:08 -05001180 length = security_set_bools(bool_num, bool_pending_values);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181
Eric Parisb77a4932010-11-23 11:40:08 -05001182 if (!length)
1183 length = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
1185out:
Ingo Molnarbb003072006-03-22 00:09:14 -08001186 mutex_unlock(&sel_mutex);
Eric Parisb77a4932010-11-23 11:40:08 -05001187 free_page((unsigned long) page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 return length;
1189}
1190
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001191static const struct file_operations sel_commit_bools_ops = {
Eric Paris18729812008-04-17 14:15:45 -04001192 .write = sel_commit_bools_write,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001193 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194};
1195
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001196static void sel_remove_entries(struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197{
Al Viroad521842014-12-24 14:56:48 -05001198 d_genocide(de);
1199 shrink_dcache_parent(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200}
1201
1202#define BOOL_DIR_NAME "booleans"
1203
1204static int sel_make_bools(void)
1205{
Eric Parisb77a4932010-11-23 11:40:08 -05001206 int i, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 ssize_t len;
1208 struct dentry *dentry = NULL;
1209 struct dentry *dir = bool_dir;
1210 struct inode *inode = NULL;
1211 struct inode_security_struct *isec;
1212 char **names = NULL, *page;
1213 int num;
1214 int *values = NULL;
1215 u32 sid;
1216
1217 /* remove any existing files */
Xiaotian Feng8007f102010-02-09 08:22:24 +11001218 for (i = 0; i < bool_num; i++)
1219 kfree(bool_pending_names[i]);
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001220 kfree(bool_pending_names);
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001221 kfree(bool_pending_values);
Eric Paris154c50c2012-04-04 13:47:11 -04001222 bool_num = 0;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001223 bool_pending_names = NULL;
Davi Arnaut20c19e42005-10-23 12:57:16 -07001224 bool_pending_values = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001226 sel_remove_entries(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Eric Parisb77a4932010-11-23 11:40:08 -05001228 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001229 page = (char *)get_zeroed_page(GFP_KERNEL);
1230 if (!page)
Eric Parisb77a4932010-11-23 11:40:08 -05001231 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232
1233 ret = security_get_bools(&num, &names, &values);
Eric Parisb77a4932010-11-23 11:40:08 -05001234 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 goto out;
1236
1237 for (i = 0; i < num; i++) {
Eric Parisb77a4932010-11-23 11:40:08 -05001238 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 dentry = d_alloc_name(dir, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001240 if (!dentry)
1241 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
Eric Parisb77a4932010-11-23 11:40:08 -05001243 ret = -ENOMEM;
1244 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1245 if (!inode)
1246 goto out;
1247
Eric Parisb77a4932010-11-23 11:40:08 -05001248 ret = -ENAMETOOLONG;
Al Virocc1dad72012-04-02 19:40:47 -04001249 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001250 if (len >= PAGE_SIZE)
1251 goto out;
1252
Eric Paris18729812008-04-17 14:15:45 -04001253 isec = (struct inode_security_struct *)inode->i_security;
1254 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1255 if (ret)
Eric Parisb77a4932010-11-23 11:40:08 -05001256 goto out;
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 isec->sid = sid;
1259 isec->initialized = 1;
1260 inode->i_fop = &sel_bool_ops;
James Carterbce34bc2007-04-04 16:18:50 -04001261 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 d_add(dentry, inode);
1263 }
1264 bool_num = num;
Stephen Smalleyd313f94832007-11-26 11:12:53 -05001265 bool_pending_names = names;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 bool_pending_values = values;
Eric Parisb77a4932010-11-23 11:40:08 -05001267
1268 free_page((unsigned long)page);
1269 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270out:
1271 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001272
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 if (names) {
Jesper Juhl9a5f04b2005-06-25 14:58:51 -07001274 for (i = 0; i < num; i++)
1275 kfree(names[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 kfree(names);
1277 }
Davi Arnaut20c19e42005-10-23 12:57:16 -07001278 kfree(values);
Christopher J. PeBenito0c92d7c2007-05-23 09:12:07 -04001279 sel_remove_entries(dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001280
1281 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282}
1283
1284#define NULL_FILE_NAME "null"
1285
Al Viro765927b2012-06-26 21:58:53 +04001286struct path selinux_null;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287
1288static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1289 size_t count, loff_t *ppos)
1290{
1291 char tmpbuf[TMPBUFLEN];
1292 ssize_t length;
1293
1294 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1295 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1296}
1297
Eric Paris18729812008-04-17 14:15:45 -04001298static ssize_t sel_write_avc_cache_threshold(struct file *file,
1299 const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 size_t count, loff_t *ppos)
1301
1302{
Eric Parisb77a4932010-11-23 11:40:08 -05001303 char *page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 ssize_t ret;
1305 int new_value;
1306
Eric Parisb77a4932010-11-23 11:40:08 -05001307 ret = task_has_security(current, SECURITY__SETSECPARAM);
1308 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
Eric Parisb77a4932010-11-23 11:40:08 -05001311 ret = -ENOMEM;
1312 if (count >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Eric Parisb77a4932010-11-23 11:40:08 -05001315 /* No partial writes. */
1316 ret = -EINVAL;
1317 if (*ppos != 0)
1318 goto out;
1319
1320 ret = -ENOMEM;
Eric Paris18729812008-04-17 14:15:45 -04001321 page = (char *)get_zeroed_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001322 if (!page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324
Eric Parisb77a4932010-11-23 11:40:08 -05001325 ret = -EFAULT;
1326 if (copy_from_user(page, buf, count))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328
Eric Parisb77a4932010-11-23 11:40:08 -05001329 ret = -EINVAL;
1330 if (sscanf(page, "%u", &new_value) != 1)
1331 goto out;
1332
1333 avc_cache_threshold = new_value;
1334
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 ret = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336out:
Eric Parisb77a4932010-11-23 11:40:08 -05001337 free_page((unsigned long)page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 return ret;
1339}
1340
1341static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1342 size_t count, loff_t *ppos)
1343{
1344 char *page;
Eric Parisb77a4932010-11-23 11:40:08 -05001345 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
1347 page = (char *)__get_free_page(GFP_KERNEL);
Eric Parisb77a4932010-11-23 11:40:08 -05001348 if (!page)
1349 return -ENOMEM;
1350
1351 length = avc_get_hash_stats(page);
1352 if (length >= 0)
1353 length = simple_read_from_buffer(buf, count, ppos, page, length);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 free_page((unsigned long)page);
Eric Parisb77a4932010-11-23 11:40:08 -05001355
1356 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357}
1358
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001359static const struct file_operations sel_avc_cache_threshold_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 .read = sel_read_avc_cache_threshold,
1361 .write = sel_write_avc_cache_threshold,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001362 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363};
1364
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001365static const struct file_operations sel_avc_hash_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 .read = sel_read_avc_hash_stats,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001367 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368};
1369
1370#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1371static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1372{
1373 int cpu;
1374
Rusty Russell4f4b6c12009-01-01 10:12:15 +10301375 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 if (!cpu_possible(cpu))
1377 continue;
1378 *idx = cpu + 1;
1379 return &per_cpu(avc_cache_stats, cpu);
1380 }
1381 return NULL;
1382}
1383
1384static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1385{
1386 loff_t n = *pos - 1;
1387
1388 if (*pos == 0)
1389 return SEQ_START_TOKEN;
1390
1391 return sel_avc_get_stat_idx(&n);
1392}
1393
1394static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1395{
1396 return sel_avc_get_stat_idx(pos);
1397}
1398
1399static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1400{
1401 struct avc_cache_stats *st = v;
1402
1403 if (v == SEQ_START_TOKEN)
1404 seq_printf(seq, "lookups hits misses allocations reclaims "
1405 "frees\n");
Linus Torvalds257313b2011-05-19 21:22:53 -07001406 else {
1407 unsigned int lookups = st->lookups;
1408 unsigned int misses = st->misses;
1409 unsigned int hits = lookups - misses;
1410 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1411 hits, misses, st->allocations,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 st->reclaims, st->frees);
Linus Torvalds257313b2011-05-19 21:22:53 -07001413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 return 0;
1415}
1416
1417static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1418{ }
1419
Jan Engelhardt1996a102008-01-23 00:02:58 +01001420static const struct seq_operations sel_avc_cache_stats_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 .start = sel_avc_stats_seq_start,
1422 .next = sel_avc_stats_seq_next,
1423 .show = sel_avc_stats_seq_show,
1424 .stop = sel_avc_stats_seq_stop,
1425};
1426
1427static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1428{
1429 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1430}
1431
Arjan van de Ven9c2e08c2007-02-12 00:55:37 -08001432static const struct file_operations sel_avc_cache_stats_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 .open = sel_open_avc_cache_stats,
1434 .read = seq_read,
1435 .llseek = seq_lseek,
1436 .release = seq_release,
1437};
1438#endif
1439
1440static int sel_make_avc_files(struct dentry *dir)
1441{
Eric Parisb77a4932010-11-23 11:40:08 -05001442 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 static struct tree_descr files[] = {
1444 { "cache_threshold",
1445 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1446 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1447#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1448 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1449#endif
1450 };
1451
Nicolas Kaiser6e20a642006-01-06 00:11:22 -08001452 for (i = 0; i < ARRAY_SIZE(files); i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 struct inode *inode;
1454 struct dentry *dentry;
1455
1456 dentry = d_alloc_name(dir, files[i].name);
Eric Parisb77a4932010-11-23 11:40:08 -05001457 if (!dentry)
1458 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
1460 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
Eric Parisb77a4932010-11-23 11:40:08 -05001461 if (!inode)
1462 return -ENOMEM;
1463
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 inode->i_fop = files[i].ops;
James Carter6174eaf2007-04-04 16:18:39 -04001465 inode->i_ino = ++sel_last_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 d_add(dentry, inode);
1467 }
Eric Parisb77a4932010-11-23 11:40:08 -05001468
1469 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470}
1471
Eric Paris18729812008-04-17 14:15:45 -04001472static ssize_t sel_read_initcon(struct file *file, char __user *buf,
James Carterf0ee2e42007-04-04 10:11:29 -04001473 size_t count, loff_t *ppos)
1474{
James Carterf0ee2e42007-04-04 10:11:29 -04001475 char *con;
1476 u32 sid, len;
1477 ssize_t ret;
1478
Al Viro496ad9a2013-01-23 17:07:38 -05001479 sid = file_inode(file)->i_ino&SEL_INO_MASK;
James Carterf0ee2e42007-04-04 10:11:29 -04001480 ret = security_sid_to_context(sid, &con, &len);
Eric Parisb77a4932010-11-23 11:40:08 -05001481 if (ret)
James Carterf0ee2e42007-04-04 10:11:29 -04001482 return ret;
1483
1484 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1485 kfree(con);
1486 return ret;
1487}
1488
1489static const struct file_operations sel_initcon_ops = {
1490 .read = sel_read_initcon,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001491 .llseek = generic_file_llseek,
James Carterf0ee2e42007-04-04 10:11:29 -04001492};
1493
1494static int sel_make_initcon_files(struct dentry *dir)
1495{
Eric Parisb77a4932010-11-23 11:40:08 -05001496 int i;
James Carterf0ee2e42007-04-04 10:11:29 -04001497
1498 for (i = 1; i <= SECINITSID_NUM; i++) {
1499 struct inode *inode;
1500 struct dentry *dentry;
1501 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
Eric Parisb77a4932010-11-23 11:40:08 -05001502 if (!dentry)
1503 return -ENOMEM;
James Carterf0ee2e42007-04-04 10:11:29 -04001504
1505 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001506 if (!inode)
1507 return -ENOMEM;
1508
James Carterf0ee2e42007-04-04 10:11:29 -04001509 inode->i_fop = &sel_initcon_ops;
1510 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1511 d_add(dentry, inode);
1512 }
Eric Parisb77a4932010-11-23 11:40:08 -05001513
1514 return 0;
James Carterf0ee2e42007-04-04 10:11:29 -04001515}
1516
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001517static inline unsigned long sel_class_to_ino(u16 class)
1518{
1519 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1520}
1521
1522static inline u16 sel_ino_to_class(unsigned long ino)
1523{
Eric Paris92ae9e82012-04-04 13:46:46 -04001524 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001525}
1526
1527static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1528{
1529 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1530}
1531
1532static inline u32 sel_ino_to_perm(unsigned long ino)
1533{
1534 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1535}
1536
Eric Paris18729812008-04-17 14:15:45 -04001537static ssize_t sel_read_class(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001538 size_t count, loff_t *ppos)
1539{
Al Viro496ad9a2013-01-23 17:07:38 -05001540 unsigned long ino = file_inode(file)->i_ino;
Al Virocc1dad72012-04-02 19:40:47 -04001541 char res[TMPBUFLEN];
1542 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1543 return simple_read_from_buffer(buf, count, ppos, res, len);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001544}
1545
1546static const struct file_operations sel_class_ops = {
1547 .read = sel_read_class,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001548 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001549};
1550
Eric Paris18729812008-04-17 14:15:45 -04001551static ssize_t sel_read_perm(struct file *file, char __user *buf,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001552 size_t count, loff_t *ppos)
1553{
Al Viro496ad9a2013-01-23 17:07:38 -05001554 unsigned long ino = file_inode(file)->i_ino;
Al Virocc1dad72012-04-02 19:40:47 -04001555 char res[TMPBUFLEN];
1556 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1557 return simple_read_from_buffer(buf, count, ppos, res, len);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001558}
1559
1560static const struct file_operations sel_perm_ops = {
1561 .read = sel_read_perm,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001562 .llseek = generic_file_llseek,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001563};
1564
Paul Moore3bb56b22008-01-29 08:38:19 -05001565static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1566 size_t count, loff_t *ppos)
1567{
1568 int value;
1569 char tmpbuf[TMPBUFLEN];
1570 ssize_t length;
Al Viro496ad9a2013-01-23 17:07:38 -05001571 unsigned long i_ino = file_inode(file)->i_ino;
Paul Moore3bb56b22008-01-29 08:38:19 -05001572
1573 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1574 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1575
1576 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1577}
1578
1579static const struct file_operations sel_policycap_ops = {
1580 .read = sel_read_policycap,
Arnd Bergmann57a62c22010-07-07 23:40:10 +02001581 .llseek = generic_file_llseek,
Paul Moore3bb56b22008-01-29 08:38:19 -05001582};
1583
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001584static int sel_make_perm_files(char *objclass, int classvalue,
1585 struct dentry *dir)
1586{
Eric Parisb77a4932010-11-23 11:40:08 -05001587 int i, rc, nperms;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001588 char **perms;
1589
1590 rc = security_get_permissions(objclass, &perms, &nperms);
1591 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001592 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001593
1594 for (i = 0; i < nperms; i++) {
1595 struct inode *inode;
1596 struct dentry *dentry;
1597
Eric Parisb77a4932010-11-23 11:40:08 -05001598 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001599 dentry = d_alloc_name(dir, perms[i]);
Eric Parisb77a4932010-11-23 11:40:08 -05001600 if (!dentry)
1601 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001602
Eric Parisb77a4932010-11-23 11:40:08 -05001603 rc = -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001604 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001605 if (!inode)
1606 goto out;
1607
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001608 inode->i_fop = &sel_perm_ops;
1609 /* i+1 since perm values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001610 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001611 d_add(dentry, inode);
1612 }
Eric Parisb77a4932010-11-23 11:40:08 -05001613 rc = 0;
1614out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001615 for (i = 0; i < nperms; i++)
1616 kfree(perms[i]);
1617 kfree(perms);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001618 return rc;
1619}
1620
1621static int sel_make_class_dir_entries(char *classname, int index,
1622 struct dentry *dir)
1623{
1624 struct dentry *dentry = NULL;
1625 struct inode *inode = NULL;
1626 int rc;
1627
1628 dentry = d_alloc_name(dir, "index");
Eric Parisb77a4932010-11-23 11:40:08 -05001629 if (!dentry)
1630 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001631
1632 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001633 if (!inode)
1634 return -ENOMEM;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001635
1636 inode->i_fop = &sel_class_ops;
1637 inode->i_ino = sel_class_to_ino(index);
1638 d_add(dentry, inode);
1639
Al Viroa1c2aa12012-03-18 20:36:59 -04001640 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1641 if (IS_ERR(dentry))
1642 return PTR_ERR(dentry);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001643
1644 rc = sel_make_perm_files(classname, index, dentry);
1645
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001646 return rc;
1647}
1648
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001649static int sel_make_classes(void)
1650{
Eric Parisb77a4932010-11-23 11:40:08 -05001651 int rc, nclasses, i;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001652 char **classes;
1653
1654 /* delete any existing entries */
Al Viroad521842014-12-24 14:56:48 -05001655 sel_remove_entries(class_dir);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001656
1657 rc = security_get_classes(&classes, &nclasses);
Eric Parisb77a4932010-11-23 11:40:08 -05001658 if (rc)
1659 return rc;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001660
1661 /* +2 since classes are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001662 last_class_ino = sel_class_to_ino(nclasses + 2);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001663
1664 for (i = 0; i < nclasses; i++) {
1665 struct dentry *class_name_dir;
1666
Al Viroa1c2aa12012-03-18 20:36:59 -04001667 class_name_dir = sel_make_dir(class_dir, classes[i],
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001668 &last_class_ino);
Al Viroa1c2aa12012-03-18 20:36:59 -04001669 if (IS_ERR(class_name_dir)) {
1670 rc = PTR_ERR(class_name_dir);
Eric Parisb77a4932010-11-23 11:40:08 -05001671 goto out;
Al Viroa1c2aa12012-03-18 20:36:59 -04001672 }
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001673
1674 /* i+1 since class values are 1-indexed */
wzt.wzt@gmail.comc1a73682010-04-09 19:30:29 +08001675 rc = sel_make_class_dir_entries(classes[i], i + 1,
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001676 class_name_dir);
1677 if (rc)
Eric Parisb77a4932010-11-23 11:40:08 -05001678 goto out;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001679 }
Eric Parisb77a4932010-11-23 11:40:08 -05001680 rc = 0;
1681out:
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001682 for (i = 0; i < nclasses; i++)
1683 kfree(classes[i]);
1684 kfree(classes);
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001685 return rc;
1686}
1687
Paul Moore3bb56b22008-01-29 08:38:19 -05001688static int sel_make_policycap(void)
1689{
1690 unsigned int iter;
1691 struct dentry *dentry = NULL;
1692 struct inode *inode = NULL;
1693
1694 sel_remove_entries(policycap_dir);
1695
1696 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1697 if (iter < ARRAY_SIZE(policycap_names))
1698 dentry = d_alloc_name(policycap_dir,
1699 policycap_names[iter]);
1700 else
1701 dentry = d_alloc_name(policycap_dir, "unknown");
1702
1703 if (dentry == NULL)
1704 return -ENOMEM;
1705
1706 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1707 if (inode == NULL)
1708 return -ENOMEM;
1709
1710 inode->i_fop = &sel_policycap_ops;
1711 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1712 d_add(dentry, inode);
1713 }
1714
1715 return 0;
1716}
1717
Al Viroa1c2aa12012-03-18 20:36:59 -04001718static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001719 unsigned long *ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720{
Al Viroa1c2aa12012-03-18 20:36:59 -04001721 struct dentry *dentry = d_alloc_name(dir, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001722 struct inode *inode;
1723
Al Viroa1c2aa12012-03-18 20:36:59 -04001724 if (!dentry)
1725 return ERR_PTR(-ENOMEM);
1726
1727 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1728 if (!inode) {
1729 dput(dentry);
1730 return ERR_PTR(-ENOMEM);
1731 }
Eric Parisb77a4932010-11-23 11:40:08 -05001732
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 inode->i_op = &simple_dir_inode_operations;
1734 inode->i_fop = &simple_dir_operations;
Christopher J. PeBenito0dd4ae52007-05-23 09:12:08 -04001735 inode->i_ino = ++(*ino);
James Morris40e906f2006-03-22 00:09:16 -08001736 /* directory inodes start off with i_nlink == 2 (for "." entry) */
Dave Hansend8c76e62006-09-30 23:29:04 -07001737 inc_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 d_add(dentry, inode);
James Morrisedb20fb2006-03-22 00:09:20 -08001739 /* bump link count on parent directory, too */
David Howellsce0b16d2015-02-19 10:47:02 +00001740 inc_nlink(d_inode(dir));
Eric Parisb77a4932010-11-23 11:40:08 -05001741
Al Viroa1c2aa12012-03-18 20:36:59 -04001742 return dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743}
1744
Eric Paris18729812008-04-17 14:15:45 -04001745static int sel_fill_super(struct super_block *sb, void *data, int silent)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001746{
1747 int ret;
1748 struct dentry *dentry;
Al Viroa1c2aa12012-03-18 20:36:59 -04001749 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 struct inode_security_struct *isec;
1751
1752 static struct tree_descr selinux_files[] = {
1753 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1754 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
Stephen Smalleyce9982d2005-11-08 21:34:33 -08001755 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1757 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1758 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1759 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1760 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1761 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1762 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1763 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1764 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1765 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
Eric Paris3f120702007-09-21 14:37:10 -04001766 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1767 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
KaiGai Kohei11904162010-09-14 18:28:39 +09001768 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
Eric Paris72e8c8592012-02-16 15:08:39 -05001769 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770 /* last one */ {""}
1771 };
1772 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1773 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001774 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001775
Al Viroa1c2aa12012-03-18 20:36:59 -04001776 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1777 if (IS_ERR(bool_dir)) {
1778 ret = PTR_ERR(bool_dir);
1779 bool_dir = NULL;
James Morris161ce452006-03-22 00:09:17 -08001780 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001781 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782
Eric Parisb77a4932010-11-23 11:40:08 -05001783 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
Eric Parisb77a4932010-11-23 11:40:08 -05001785 if (!dentry)
James Morris161ce452006-03-22 00:09:17 -08001786 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001787
Eric Parisb77a4932010-11-23 11:40:08 -05001788 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
Eric Parisb77a4932010-11-23 11:40:08 -05001790 if (!inode)
James Morris161ce452006-03-22 00:09:17 -08001791 goto err;
Eric Parisb77a4932010-11-23 11:40:08 -05001792
James Carter6174eaf2007-04-04 16:18:39 -04001793 inode->i_ino = ++sel_last_ino;
Eric Paris18729812008-04-17 14:15:45 -04001794 isec = (struct inode_security_struct *)inode->i_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 isec->sid = SECINITSID_DEVNULL;
1796 isec->sclass = SECCLASS_CHR_FILE;
1797 isec->initialized = 1;
1798
1799 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1800 d_add(dentry, inode);
Al Viro765927b2012-06-26 21:58:53 +04001801 selinux_null.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802
Al Viroa1c2aa12012-03-18 20:36:59 -04001803 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1804 if (IS_ERR(dentry)) {
1805 ret = PTR_ERR(dentry);
James Morris161ce452006-03-22 00:09:17 -08001806 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001807 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808
1809 ret = sel_make_avc_files(dentry);
1810 if (ret)
James Morris161ce452006-03-22 00:09:17 -08001811 goto err;
James Carterf0ee2e42007-04-04 10:11:29 -04001812
Al Viroa1c2aa12012-03-18 20:36:59 -04001813 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1814 if (IS_ERR(dentry)) {
1815 ret = PTR_ERR(dentry);
James Carterf0ee2e42007-04-04 10:11:29 -04001816 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001817 }
James Carterf0ee2e42007-04-04 10:11:29 -04001818
1819 ret = sel_make_initcon_files(dentry);
1820 if (ret)
1821 goto err;
1822
Al Viroa1c2aa12012-03-18 20:36:59 -04001823 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1824 if (IS_ERR(class_dir)) {
1825 ret = PTR_ERR(class_dir);
1826 class_dir = NULL;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001827 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001828 }
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001829
Al Viroa1c2aa12012-03-18 20:36:59 -04001830 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1831 if (IS_ERR(policycap_dir)) {
1832 ret = PTR_ERR(policycap_dir);
1833 policycap_dir = NULL;
Christopher J. PeBenitoe47c8fc2007-05-23 09:12:09 -04001834 goto err;
Al Viroa1c2aa12012-03-18 20:36:59 -04001835 }
Eric Parisb77a4932010-11-23 11:40:08 -05001836 return 0;
James Morris161ce452006-03-22 00:09:17 -08001837err:
Eric Paris744ba352008-04-17 11:52:44 -04001838 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1839 __func__);
Eric Parisb77a4932010-11-23 11:40:08 -05001840 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841}
1842
Al Virofc14f2f2010-07-25 01:48:30 +04001843static struct dentry *sel_mount(struct file_system_type *fs_type,
1844 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001845{
Al Virofc14f2f2010-07-25 01:48:30 +04001846 return mount_single(fs_type, flags, data, sel_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847}
1848
1849static struct file_system_type sel_fs_type = {
1850 .name = "selinuxfs",
Al Virofc14f2f2010-07-25 01:48:30 +04001851 .mount = sel_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 .kill_sb = kill_litter_super,
1853};
1854
1855struct vfsmount *selinuxfs_mount;
1856
1857static int __init init_sel_fs(void)
1858{
1859 int err;
1860
1861 if (!selinux_enabled)
1862 return 0;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001863
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001864 err = sysfs_create_mount_point(fs_kobj, "selinux");
1865 if (err)
1866 return err;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001867
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868 err = register_filesystem(&sel_fs_type);
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001869 if (err) {
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001870 sysfs_remove_mount_point(fs_kobj, "selinux");
Eric Parisb77a4932010-11-23 11:40:08 -05001871 return err;
Greg Kroah-Hartman7a627e32011-05-10 15:34:16 -07001872 }
Eric Parisb77a4932010-11-23 11:40:08 -05001873
Al Viro765927b2012-06-26 21:58:53 +04001874 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
Eric Parisb77a4932010-11-23 11:40:08 -05001875 if (IS_ERR(selinuxfs_mount)) {
1876 printk(KERN_ERR "selinuxfs: could not mount!\n");
1877 err = PTR_ERR(selinuxfs_mount);
1878 selinuxfs_mount = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 }
Eric Parisb77a4932010-11-23 11:40:08 -05001880
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 return err;
1882}
1883
1884__initcall(init_sel_fs);
1885
1886#ifdef CONFIG_SECURITY_SELINUX_DISABLE
1887void exit_sel_fs(void)
1888{
Eric W. Biedermanf9bb4882015-05-13 17:35:41 -05001889 sysfs_remove_mount_point(fs_kobj, "selinux");
Tim Chen423e0ab2011-07-19 09:32:38 -07001890 kern_unmount(selinuxfs_mount);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 unregister_filesystem(&sel_fs_type);
1892}
1893#endif