Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
1872981b | 3 | * Added conditional policy language extensions |
1da177e4 | 4 | * |
3bb56b25 PM |
5 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
6 | * | |
1872981b | 7 | * Added support for the policy capability bitmap |
3bb56b25 PM |
8 | * |
9 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
10 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
11 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
12 | * This program is free software; you can redistribute it and/or modify | |
1872981b | 13 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
14 | * the Free Software Foundation, version 2. |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
bb003079 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/percpu.h> | |
af601e46 | 29 | #include <linux/audit.h> |
f5269710 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | |
32 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
33 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
34 | ||
35 | #include "flask.h" | |
36 | #include "avc.h" | |
37 | #include "avc_ss.h" | |
38 | #include "security.h" | |
39 | #include "objsec.h" | |
40 | #include "conditional.h" | |
41 | ||
3bb56b25 PM |
42 | /* Policy capability filenames */ |
43 | static char *policycap_names[] = { | |
b0c636b9 EP |
44 | "network_peer_controls", |
45 | "open_perms" | |
3bb56b25 PM |
46 | }; |
47 | ||
1da177e4 LT |
48 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
49 | ||
50 | static int __init checkreqprot_setup(char *str) | |
51 | { | |
f5269710 EP |
52 | unsigned long checkreqprot; |
53 | if (!strict_strtoul(str, 0, &checkreqprot)) | |
54 | selinux_checkreqprot = checkreqprot ? 1 : 0; | |
1da177e4 LT |
55 | return 1; |
56 | } | |
57 | __setup("checkreqprot=", checkreqprot_setup); | |
58 | ||
bb003079 | 59 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
60 | |
61 | /* global data for booleans */ | |
1872981b EP |
62 | static struct dentry *bool_dir; |
63 | static int bool_num; | |
d313f948 | 64 | static char **bool_pending_names; |
1872981b | 65 | static int *bool_pending_values; |
1da177e4 | 66 | |
e47c8fc5 | 67 | /* global data for classes */ |
1872981b | 68 | static struct dentry *class_dir; |
e47c8fc5 CP |
69 | static unsigned long last_class_ino; |
70 | ||
cee74f47 EP |
71 | static char policy_opened; |
72 | ||
3bb56b25 | 73 | /* global data for policy capabilities */ |
1872981b | 74 | static struct dentry *policycap_dir; |
3bb56b25 | 75 | |
1da177e4 LT |
76 | extern void selnl_notify_setenforce(int val); |
77 | ||
78 | /* Check whether a task is allowed to use a security operation. */ | |
79 | static int task_has_security(struct task_struct *tsk, | |
80 | u32 perms) | |
81 | { | |
c69e8d9c DH |
82 | const struct task_security_struct *tsec; |
83 | u32 sid = 0; | |
84 | ||
85 | rcu_read_lock(); | |
86 | tsec = __task_cred(tsk)->security; | |
87 | if (tsec) | |
88 | sid = tsec->sid; | |
89 | rcu_read_unlock(); | |
1da177e4 LT |
90 | if (!tsec) |
91 | return -EACCES; | |
92 | ||
c69e8d9c | 93 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
94 | SECCLASS_SECURITY, perms, NULL); |
95 | } | |
96 | ||
97 | enum sel_inos { | |
98 | SEL_ROOT_INO = 2, | |
99 | SEL_LOAD, /* load policy */ | |
100 | SEL_ENFORCE, /* get or set enforcing status */ | |
101 | SEL_CONTEXT, /* validate context */ | |
102 | SEL_ACCESS, /* compute access decision */ | |
103 | SEL_CREATE, /* compute create labeling decision */ | |
104 | SEL_RELABEL, /* compute relabeling decision */ | |
105 | SEL_USER, /* compute reachable user contexts */ | |
106 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
107 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
108 | SEL_MLS, /* return if MLS policy is enabled */ | |
109 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
110 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
111 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 112 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
113 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
114 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 115 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 116 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
6174eafc | 117 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
118 | }; |
119 | ||
6174eafc JC |
120 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
121 | ||
3bb56b25 PM |
122 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
123 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
124 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
125 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
126 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 127 | |
1da177e4 LT |
128 | #define TMPBUFLEN 12 |
129 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
130 | size_t count, loff_t *ppos) | |
131 | { | |
132 | char tmpbuf[TMPBUFLEN]; | |
133 | ssize_t length; | |
134 | ||
135 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
136 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
137 | } | |
138 | ||
139 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 140 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
141 | size_t count, loff_t *ppos) |
142 | ||
143 | { | |
144 | char *page; | |
145 | ssize_t length; | |
146 | int new_value; | |
147 | ||
bfd51626 | 148 | if (count >= PAGE_SIZE) |
1da177e4 LT |
149 | return -ENOMEM; |
150 | if (*ppos != 0) { | |
151 | /* No partial writes. */ | |
152 | return -EINVAL; | |
153 | } | |
1872981b | 154 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
155 | if (!page) |
156 | return -ENOMEM; | |
157 | length = -EFAULT; | |
158 | if (copy_from_user(page, buf, count)) | |
159 | goto out; | |
160 | ||
161 | length = -EINVAL; | |
162 | if (sscanf(page, "%d", &new_value) != 1) | |
163 | goto out; | |
164 | ||
165 | if (new_value != selinux_enforcing) { | |
166 | length = task_has_security(current, SECURITY__SETENFORCE); | |
167 | if (length) | |
168 | goto out; | |
af601e46 | 169 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
170 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
171 | new_value, selinux_enforcing, | |
172 | audit_get_loginuid(current), | |
173 | audit_get_sessionid(current)); | |
1da177e4 LT |
174 | selinux_enforcing = new_value; |
175 | if (selinux_enforcing) | |
176 | avc_ss_reset(0); | |
177 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 178 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
179 | } |
180 | length = count; | |
181 | out: | |
182 | free_page((unsigned long) page); | |
183 | return length; | |
184 | } | |
185 | #else | |
186 | #define sel_write_enforce NULL | |
187 | #endif | |
188 | ||
9c2e08c5 | 189 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
190 | .read = sel_read_enforce, |
191 | .write = sel_write_enforce, | |
57a62c23 | 192 | .llseek = generic_file_llseek, |
1da177e4 LT |
193 | }; |
194 | ||
3f12070e EP |
195 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
196 | size_t count, loff_t *ppos) | |
197 | { | |
198 | char tmpbuf[TMPBUFLEN]; | |
199 | ssize_t length; | |
200 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
201 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? | |
202 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
203 | ||
204 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
205 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
206 | } | |
207 | ||
208 | static const struct file_operations sel_handle_unknown_ops = { | |
209 | .read = sel_read_handle_unknown, | |
57a62c23 | 210 | .llseek = generic_file_llseek, |
3f12070e EP |
211 | }; |
212 | ||
11904167 KK |
213 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
214 | { | |
215 | struct page *status = selinux_kernel_status_page(); | |
216 | ||
217 | if (!status) | |
218 | return -ENOMEM; | |
219 | ||
220 | filp->private_data = status; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
226 | size_t count, loff_t *ppos) | |
227 | { | |
228 | struct page *status = filp->private_data; | |
229 | ||
230 | BUG_ON(!status); | |
231 | ||
232 | return simple_read_from_buffer(buf, count, ppos, | |
233 | page_address(status), | |
234 | sizeof(struct selinux_kernel_status)); | |
235 | } | |
236 | ||
237 | static int sel_mmap_handle_status(struct file *filp, | |
238 | struct vm_area_struct *vma) | |
239 | { | |
240 | struct page *status = filp->private_data; | |
241 | unsigned long size = vma->vm_end - vma->vm_start; | |
242 | ||
243 | BUG_ON(!status); | |
244 | ||
245 | /* only allows one page from the head */ | |
246 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
247 | return -EIO; | |
248 | /* disallow writable mapping */ | |
249 | if (vma->vm_flags & VM_WRITE) | |
250 | return -EPERM; | |
251 | /* disallow mprotect() turns it into writable */ | |
252 | vma->vm_flags &= ~VM_MAYWRITE; | |
253 | ||
254 | return remap_pfn_range(vma, vma->vm_start, | |
255 | page_to_pfn(status), | |
256 | size, vma->vm_page_prot); | |
257 | } | |
258 | ||
259 | static const struct file_operations sel_handle_status_ops = { | |
260 | .open = sel_open_handle_status, | |
261 | .read = sel_read_handle_status, | |
262 | .mmap = sel_mmap_handle_status, | |
263 | .llseek = generic_file_llseek, | |
264 | }; | |
265 | ||
1da177e4 | 266 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 267 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
268 | size_t count, loff_t *ppos) |
269 | ||
270 | { | |
271 | char *page; | |
272 | ssize_t length; | |
273 | int new_value; | |
274 | extern int selinux_disable(void); | |
275 | ||
bfd51626 | 276 | if (count >= PAGE_SIZE) |
1da177e4 LT |
277 | return -ENOMEM; |
278 | if (*ppos != 0) { | |
279 | /* No partial writes. */ | |
280 | return -EINVAL; | |
281 | } | |
1872981b | 282 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
283 | if (!page) |
284 | return -ENOMEM; | |
285 | length = -EFAULT; | |
286 | if (copy_from_user(page, buf, count)) | |
287 | goto out; | |
288 | ||
289 | length = -EINVAL; | |
290 | if (sscanf(page, "%d", &new_value) != 1) | |
291 | goto out; | |
292 | ||
293 | if (new_value) { | |
294 | length = selinux_disable(); | |
295 | if (length < 0) | |
296 | goto out; | |
af601e46 | 297 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
298 | "selinux=0 auid=%u ses=%u", |
299 | audit_get_loginuid(current), | |
300 | audit_get_sessionid(current)); | |
1da177e4 LT |
301 | } |
302 | ||
303 | length = count; | |
304 | out: | |
305 | free_page((unsigned long) page); | |
306 | return length; | |
307 | } | |
308 | #else | |
309 | #define sel_write_disable NULL | |
310 | #endif | |
311 | ||
9c2e08c5 | 312 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 313 | .write = sel_write_disable, |
57a62c23 | 314 | .llseek = generic_file_llseek, |
1da177e4 LT |
315 | }; |
316 | ||
317 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 318 | size_t count, loff_t *ppos) |
1da177e4 LT |
319 | { |
320 | char tmpbuf[TMPBUFLEN]; | |
321 | ssize_t length; | |
322 | ||
323 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
324 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
325 | } | |
326 | ||
9c2e08c5 | 327 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 328 | .read = sel_read_policyvers, |
57a62c23 | 329 | .llseek = generic_file_llseek, |
1da177e4 LT |
330 | }; |
331 | ||
332 | /* declaration for sel_write_load */ | |
333 | static int sel_make_bools(void); | |
e47c8fc5 | 334 | static int sel_make_classes(void); |
3bb56b25 | 335 | static int sel_make_policycap(void); |
e47c8fc5 CP |
336 | |
337 | /* declaration for sel_make_class_dirs */ | |
338 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
339 | unsigned long *ino); | |
1da177e4 LT |
340 | |
341 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
342 | size_t count, loff_t *ppos) | |
343 | { | |
344 | char tmpbuf[TMPBUFLEN]; | |
345 | ssize_t length; | |
346 | ||
0719aaf5 GT |
347 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
348 | security_mls_enabled()); | |
1da177e4 LT |
349 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
350 | } | |
351 | ||
9c2e08c5 | 352 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 353 | .read = sel_read_mls, |
57a62c23 | 354 | .llseek = generic_file_llseek, |
1da177e4 LT |
355 | }; |
356 | ||
cee74f47 EP |
357 | struct policy_load_memory { |
358 | size_t len; | |
359 | void *data; | |
360 | }; | |
361 | ||
362 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
363 | { | |
364 | struct policy_load_memory *plm = NULL; | |
365 | int rc; | |
366 | ||
367 | BUG_ON(filp->private_data); | |
368 | ||
369 | mutex_lock(&sel_mutex); | |
370 | ||
371 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
372 | if (rc) | |
373 | goto err; | |
374 | ||
375 | rc = -EBUSY; | |
376 | if (policy_opened) | |
377 | goto err; | |
378 | ||
379 | rc = -ENOMEM; | |
380 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
381 | if (!plm) | |
382 | goto err; | |
383 | ||
384 | if (i_size_read(inode) != security_policydb_len()) { | |
385 | mutex_lock(&inode->i_mutex); | |
386 | i_size_write(inode, security_policydb_len()); | |
387 | mutex_unlock(&inode->i_mutex); | |
388 | } | |
389 | ||
390 | rc = security_read_policy(&plm->data, &plm->len); | |
391 | if (rc) | |
392 | goto err; | |
393 | ||
394 | policy_opened = 1; | |
395 | ||
396 | filp->private_data = plm; | |
397 | ||
398 | mutex_unlock(&sel_mutex); | |
399 | ||
400 | return 0; | |
401 | err: | |
402 | mutex_unlock(&sel_mutex); | |
403 | ||
404 | if (plm) | |
405 | vfree(plm->data); | |
406 | kfree(plm); | |
407 | return rc; | |
408 | } | |
409 | ||
410 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
411 | { | |
412 | struct policy_load_memory *plm = filp->private_data; | |
413 | ||
414 | BUG_ON(!plm); | |
415 | ||
416 | policy_opened = 0; | |
417 | ||
418 | vfree(plm->data); | |
419 | kfree(plm); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
425 | size_t count, loff_t *ppos) | |
426 | { | |
427 | struct policy_load_memory *plm = filp->private_data; | |
428 | int ret; | |
429 | ||
430 | mutex_lock(&sel_mutex); | |
431 | ||
432 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
433 | if (ret) | |
434 | goto out; | |
435 | ||
436 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
437 | out: | |
438 | mutex_unlock(&sel_mutex); | |
439 | return ret; | |
440 | } | |
441 | ||
845ca30f EP |
442 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
443 | struct vm_fault *vmf) | |
444 | { | |
445 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
446 | unsigned long offset; | |
447 | struct page *page; | |
448 | ||
449 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
450 | return VM_FAULT_SIGBUS; | |
451 | ||
452 | offset = vmf->pgoff << PAGE_SHIFT; | |
453 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
454 | return VM_FAULT_SIGBUS; | |
455 | ||
456 | page = vmalloc_to_page(plm->data + offset); | |
457 | get_page(page); | |
458 | ||
459 | vmf->page = page; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static struct vm_operations_struct sel_mmap_policy_ops = { | |
465 | .fault = sel_mmap_policy_fault, | |
466 | .page_mkwrite = sel_mmap_policy_fault, | |
467 | }; | |
468 | ||
469 | int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) | |
470 | { | |
471 | if (vma->vm_flags & VM_SHARED) { | |
472 | /* do not allow mprotect to make mapping writable */ | |
473 | vma->vm_flags &= ~VM_MAYWRITE; | |
474 | ||
475 | if (vma->vm_flags & VM_WRITE) | |
476 | return -EACCES; | |
477 | } | |
478 | ||
479 | vma->vm_flags |= VM_RESERVED; | |
480 | vma->vm_ops = &sel_mmap_policy_ops; | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
cee74f47 EP |
485 | static const struct file_operations sel_policy_ops = { |
486 | .open = sel_open_policy, | |
487 | .read = sel_read_policy, | |
845ca30f | 488 | .mmap = sel_mmap_policy, |
cee74f47 EP |
489 | .release = sel_release_policy, |
490 | }; | |
491 | ||
1872981b | 492 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
493 | size_t count, loff_t *ppos) |
494 | ||
495 | { | |
496 | int ret; | |
497 | ssize_t length; | |
498 | void *data = NULL; | |
499 | ||
bb003079 | 500 | mutex_lock(&sel_mutex); |
1da177e4 LT |
501 | |
502 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
503 | if (length) | |
504 | goto out; | |
505 | ||
506 | if (*ppos != 0) { | |
507 | /* No partial writes. */ | |
508 | length = -EINVAL; | |
509 | goto out; | |
510 | } | |
511 | ||
bfd51626 | 512 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
513 | || (data = vmalloc(count)) == NULL) { |
514 | length = -ENOMEM; | |
515 | goto out; | |
516 | } | |
517 | ||
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 | ||
526 | ret = sel_make_bools(); | |
e47c8fc5 CP |
527 | if (ret) { |
528 | length = ret; | |
529 | goto out1; | |
530 | } | |
531 | ||
532 | ret = sel_make_classes(); | |
3bb56b25 PM |
533 | if (ret) { |
534 | length = ret; | |
535 | goto out1; | |
536 | } | |
537 | ||
538 | ret = sel_make_policycap(); | |
1da177e4 LT |
539 | if (ret) |
540 | length = ret; | |
541 | else | |
542 | length = count; | |
e47c8fc5 CP |
543 | |
544 | out1: | |
af601e46 | 545 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b EP |
546 | "policy loaded auid=%u ses=%u", |
547 | audit_get_loginuid(current), | |
548 | audit_get_sessionid(current)); | |
1da177e4 | 549 | out: |
bb003079 | 550 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
551 | vfree(data); |
552 | return length; | |
553 | } | |
554 | ||
9c2e08c5 | 555 | static const struct file_operations sel_load_ops = { |
1da177e4 | 556 | .write = sel_write_load, |
57a62c23 | 557 | .llseek = generic_file_llseek, |
1da177e4 LT |
558 | }; |
559 | ||
1872981b | 560 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 561 | { |
ce9982d0 SS |
562 | char *canon; |
563 | u32 sid, len; | |
1da177e4 LT |
564 | ssize_t length; |
565 | ||
566 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
567 | if (length) | |
568 | return length; | |
569 | ||
ce9982d0 SS |
570 | length = security_context_to_sid(buf, size, &sid); |
571 | if (length < 0) | |
572 | return length; | |
1da177e4 | 573 | |
ce9982d0 | 574 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 575 | if (length < 0) |
ce9982d0 SS |
576 | return length; |
577 | ||
578 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
579 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
580 | "payload max\n", __func__, len); | |
ce9982d0 | 581 | length = -ERANGE; |
1da177e4 | 582 | goto out; |
ce9982d0 | 583 | } |
1da177e4 | 584 | |
ce9982d0 SS |
585 | memcpy(buf, canon, len); |
586 | length = len; | |
1da177e4 | 587 | out: |
ce9982d0 | 588 | kfree(canon); |
1da177e4 LT |
589 | return length; |
590 | } | |
591 | ||
1da177e4 LT |
592 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
593 | size_t count, loff_t *ppos) | |
594 | { | |
595 | char tmpbuf[TMPBUFLEN]; | |
596 | ssize_t length; | |
597 | ||
598 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
599 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
600 | } | |
601 | ||
1872981b | 602 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
603 | size_t count, loff_t *ppos) |
604 | { | |
605 | char *page; | |
606 | ssize_t length; | |
607 | unsigned int new_value; | |
608 | ||
609 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
610 | if (length) | |
611 | return length; | |
612 | ||
bfd51626 | 613 | if (count >= PAGE_SIZE) |
1da177e4 LT |
614 | return -ENOMEM; |
615 | if (*ppos != 0) { | |
616 | /* No partial writes. */ | |
617 | return -EINVAL; | |
618 | } | |
1872981b | 619 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
620 | if (!page) |
621 | return -ENOMEM; | |
622 | length = -EFAULT; | |
623 | if (copy_from_user(page, buf, count)) | |
624 | goto out; | |
625 | ||
626 | length = -EINVAL; | |
627 | if (sscanf(page, "%u", &new_value) != 1) | |
628 | goto out; | |
629 | ||
630 | selinux_checkreqprot = new_value ? 1 : 0; | |
631 | length = count; | |
632 | out: | |
633 | free_page((unsigned long) page); | |
634 | return length; | |
635 | } | |
9c2e08c5 | 636 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
637 | .read = sel_read_checkreqprot, |
638 | .write = sel_write_checkreqprot, | |
57a62c23 | 639 | .llseek = generic_file_llseek, |
1da177e4 LT |
640 | }; |
641 | ||
642 | /* | |
643 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
644 | */ | |
1872981b EP |
645 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
646 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
647 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
648 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
649 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
650 | |
651 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
652 | [SEL_ACCESS] = sel_write_access, | |
653 | [SEL_CREATE] = sel_write_create, | |
654 | [SEL_RELABEL] = sel_write_relabel, | |
655 | [SEL_USER] = sel_write_user, | |
656 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 657 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
658 | }; |
659 | ||
660 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
661 | { | |
1872981b | 662 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
663 | char *data; |
664 | ssize_t rv; | |
665 | ||
6e20a64a | 666 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
667 | return -EINVAL; |
668 | ||
669 | data = simple_transaction_get(file, buf, size); | |
670 | if (IS_ERR(data)) | |
671 | return PTR_ERR(data); | |
672 | ||
1872981b EP |
673 | rv = write_op[ino](file, data, size); |
674 | if (rv > 0) { | |
1da177e4 LT |
675 | simple_transaction_set(file, rv); |
676 | rv = size; | |
677 | } | |
678 | return rv; | |
679 | } | |
680 | ||
9c2e08c5 | 681 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
682 | .write = selinux_transaction_write, |
683 | .read = simple_transaction_read, | |
684 | .release = simple_transaction_release, | |
57a62c23 | 685 | .llseek = generic_file_llseek, |
1da177e4 LT |
686 | }; |
687 | ||
688 | /* | |
689 | * payload - write methods | |
690 | * If the method has a response, the response should be put in buf, | |
691 | * and the length returned. Otherwise return 0 or and -error. | |
692 | */ | |
693 | ||
1872981b | 694 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 LT |
695 | { |
696 | char *scon, *tcon; | |
697 | u32 ssid, tsid; | |
698 | u16 tclass; | |
1da177e4 LT |
699 | struct av_decision avd; |
700 | ssize_t length; | |
701 | ||
702 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
703 | if (length) | |
704 | return length; | |
705 | ||
706 | length = -ENOMEM; | |
c1a7368a | 707 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
708 | if (!scon) |
709 | return length; | |
1da177e4 | 710 | |
c1a7368a | 711 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
712 | if (!tcon) |
713 | goto out; | |
1da177e4 LT |
714 | |
715 | length = -EINVAL; | |
19439d05 | 716 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
1da177e4 LT |
717 | goto out2; |
718 | ||
c1a7368a | 719 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
720 | if (length < 0) |
721 | goto out2; | |
c1a7368a | 722 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
723 | if (length < 0) |
724 | goto out2; | |
725 | ||
19439d05 | 726 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
727 | |
728 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 729 | "%x %x %x %x %u %x", |
f1c6381a | 730 | avd.allowed, 0xffffffff, |
1da177e4 | 731 | avd.auditallow, avd.auditdeny, |
8a6f83af | 732 | avd.seqno, avd.flags); |
1da177e4 LT |
733 | out2: |
734 | kfree(tcon); | |
735 | out: | |
736 | kfree(scon); | |
737 | return length; | |
738 | } | |
739 | ||
1872981b | 740 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 LT |
741 | { |
742 | char *scon, *tcon; | |
743 | u32 ssid, tsid, newsid; | |
744 | u16 tclass; | |
745 | ssize_t length; | |
746 | char *newcon; | |
747 | u32 len; | |
748 | ||
749 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
750 | if (length) | |
751 | return length; | |
752 | ||
753 | length = -ENOMEM; | |
c1a7368a | 754 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
755 | if (!scon) |
756 | return length; | |
1da177e4 | 757 | |
c1a7368a | 758 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
759 | if (!tcon) |
760 | goto out; | |
1da177e4 LT |
761 | |
762 | length = -EINVAL; | |
763 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
764 | goto out2; | |
765 | ||
c1a7368a | 766 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
767 | if (length < 0) |
768 | goto out2; | |
c1a7368a | 769 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
770 | if (length < 0) |
771 | goto out2; | |
772 | ||
c6d3aaa4 | 773 | length = security_transition_sid_user(ssid, tsid, tclass, &newsid); |
1da177e4 LT |
774 | if (length < 0) |
775 | goto out2; | |
776 | ||
777 | length = security_sid_to_context(newsid, &newcon, &len); | |
778 | if (length < 0) | |
779 | goto out2; | |
780 | ||
781 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
782 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
783 | "payload max\n", __func__, len); | |
1da177e4 LT |
784 | length = -ERANGE; |
785 | goto out3; | |
786 | } | |
787 | ||
788 | memcpy(buf, newcon, len); | |
789 | length = len; | |
790 | out3: | |
791 | kfree(newcon); | |
792 | out2: | |
793 | kfree(tcon); | |
794 | out: | |
795 | kfree(scon); | |
796 | return length; | |
797 | } | |
798 | ||
1872981b | 799 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 LT |
800 | { |
801 | char *scon, *tcon; | |
802 | u32 ssid, tsid, newsid; | |
803 | u16 tclass; | |
804 | ssize_t length; | |
805 | char *newcon; | |
806 | u32 len; | |
807 | ||
808 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
809 | if (length) | |
810 | return length; | |
811 | ||
812 | length = -ENOMEM; | |
c1a7368a | 813 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
814 | if (!scon) |
815 | return length; | |
1da177e4 | 816 | |
c1a7368a | 817 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
818 | if (!tcon) |
819 | goto out; | |
1da177e4 LT |
820 | |
821 | length = -EINVAL; | |
822 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
823 | goto out2; | |
824 | ||
c1a7368a | 825 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
826 | if (length < 0) |
827 | goto out2; | |
c1a7368a | 828 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
829 | if (length < 0) |
830 | goto out2; | |
831 | ||
832 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
833 | if (length < 0) | |
834 | goto out2; | |
835 | ||
836 | length = security_sid_to_context(newsid, &newcon, &len); | |
837 | if (length < 0) | |
838 | goto out2; | |
839 | ||
840 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
841 | length = -ERANGE; | |
842 | goto out3; | |
843 | } | |
844 | ||
845 | memcpy(buf, newcon, len); | |
846 | length = len; | |
847 | out3: | |
848 | kfree(newcon); | |
849 | out2: | |
850 | kfree(tcon); | |
851 | out: | |
852 | kfree(scon); | |
853 | return length; | |
854 | } | |
855 | ||
1872981b | 856 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 LT |
857 | { |
858 | char *con, *user, *ptr; | |
859 | u32 sid, *sids; | |
860 | ssize_t length; | |
861 | char *newcon; | |
862 | int i, rc; | |
863 | u32 len, nsids; | |
864 | ||
865 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
866 | if (length) | |
867 | return length; | |
868 | ||
869 | length = -ENOMEM; | |
c1a7368a | 870 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
871 | if (!con) |
872 | return length; | |
1da177e4 | 873 | |
c1a7368a | 874 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
875 | if (!user) |
876 | goto out; | |
1da177e4 LT |
877 | |
878 | length = -EINVAL; | |
879 | if (sscanf(buf, "%s %s", con, user) != 2) | |
880 | goto out2; | |
881 | ||
c1a7368a | 882 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
1da177e4 LT |
883 | if (length < 0) |
884 | goto out2; | |
885 | ||
886 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
887 | if (length < 0) | |
888 | goto out2; | |
889 | ||
890 | length = sprintf(buf, "%u", nsids) + 1; | |
891 | ptr = buf + length; | |
892 | for (i = 0; i < nsids; i++) { | |
893 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
894 | if (rc) { | |
895 | length = rc; | |
896 | goto out3; | |
897 | } | |
898 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
899 | kfree(newcon); | |
900 | length = -ERANGE; | |
901 | goto out3; | |
902 | } | |
903 | memcpy(ptr, newcon, len); | |
904 | kfree(newcon); | |
905 | ptr += len; | |
906 | length += len; | |
907 | } | |
908 | out3: | |
909 | kfree(sids); | |
910 | out2: | |
911 | kfree(user); | |
912 | out: | |
913 | kfree(con); | |
914 | return length; | |
915 | } | |
916 | ||
1872981b | 917 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 LT |
918 | { |
919 | char *scon, *tcon; | |
920 | u32 ssid, tsid, newsid; | |
921 | u16 tclass; | |
922 | ssize_t length; | |
923 | char *newcon; | |
924 | u32 len; | |
925 | ||
926 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
927 | if (length) | |
928 | return length; | |
929 | ||
930 | length = -ENOMEM; | |
c1a7368a | 931 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
932 | if (!scon) |
933 | return length; | |
1da177e4 | 934 | |
c1a7368a | 935 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
936 | if (!tcon) |
937 | goto out; | |
1da177e4 LT |
938 | |
939 | length = -EINVAL; | |
940 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
941 | goto out2; | |
942 | ||
c1a7368a | 943 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
944 | if (length < 0) |
945 | goto out2; | |
c1a7368a | 946 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
947 | if (length < 0) |
948 | goto out2; | |
949 | ||
950 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
951 | if (length < 0) | |
952 | goto out2; | |
953 | ||
954 | length = security_sid_to_context(newsid, &newcon, &len); | |
955 | if (length < 0) | |
956 | goto out2; | |
957 | ||
958 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
959 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
960 | "payload max\n", __func__, len); | |
1da177e4 LT |
961 | length = -ERANGE; |
962 | goto out3; | |
963 | } | |
964 | ||
965 | memcpy(buf, newcon, len); | |
966 | length = len; | |
967 | out3: | |
968 | kfree(newcon); | |
969 | out2: | |
970 | kfree(tcon); | |
971 | out: | |
972 | kfree(scon); | |
973 | return length; | |
974 | } | |
975 | ||
976 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
977 | { | |
978 | struct inode *ret = new_inode(sb); | |
979 | ||
980 | if (ret) { | |
85fe4025 | 981 | ret->i_ino = get_next_ino(); |
1da177e4 | 982 | ret->i_mode = mode; |
1da177e4 LT |
983 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
984 | } | |
985 | return ret; | |
986 | } | |
987 | ||
1da177e4 LT |
988 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
989 | size_t count, loff_t *ppos) | |
990 | { | |
991 | char *page = NULL; | |
992 | ssize_t length; | |
1da177e4 LT |
993 | ssize_t ret; |
994 | int cur_enforcing; | |
d313f948 SS |
995 | struct inode *inode = filep->f_path.dentry->d_inode; |
996 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
997 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 998 | |
bb003079 | 999 | mutex_lock(&sel_mutex); |
1da177e4 | 1000 | |
d313f948 SS |
1001 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) { |
1002 | ret = -EINVAL; | |
1003 | goto out; | |
1004 | } | |
1da177e4 | 1005 | |
1872981b EP |
1006 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1007 | if (!page) { | |
1da177e4 LT |
1008 | ret = -ENOMEM; |
1009 | goto out; | |
1010 | } | |
1011 | ||
d313f948 | 1012 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1013 | if (cur_enforcing < 0) { |
1014 | ret = cur_enforcing; | |
1015 | goto out; | |
1016 | } | |
1da177e4 | 1017 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1018 | bool_pending_values[index]); |
68bdcf28 | 1019 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1020 | out: |
bb003079 | 1021 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
1022 | if (page) |
1023 | free_page((unsigned long)page); | |
1024 | return ret; | |
1025 | } | |
1026 | ||
1027 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1028 | size_t count, loff_t *ppos) | |
1029 | { | |
1030 | char *page = NULL; | |
d313f948 | 1031 | ssize_t length; |
1da177e4 | 1032 | int new_value; |
d313f948 SS |
1033 | struct inode *inode = filep->f_path.dentry->d_inode; |
1034 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1035 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1036 | |
bb003079 | 1037 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1038 | |
1039 | length = task_has_security(current, SECURITY__SETBOOL); | |
1040 | if (length) | |
1041 | goto out; | |
1042 | ||
d313f948 SS |
1043 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) { |
1044 | length = -EINVAL; | |
1045 | goto out; | |
1046 | } | |
1047 | ||
bfd51626 | 1048 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1049 | length = -ENOMEM; |
1050 | goto out; | |
1051 | } | |
d313f948 | 1052 | |
1da177e4 LT |
1053 | if (*ppos != 0) { |
1054 | /* No partial writes. */ | |
d313f948 | 1055 | length = -EINVAL; |
1da177e4 LT |
1056 | goto out; |
1057 | } | |
1872981b | 1058 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1059 | if (!page) { |
1060 | length = -ENOMEM; | |
1061 | goto out; | |
1062 | } | |
1063 | ||
d313f948 | 1064 | length = -EFAULT; |
1da177e4 LT |
1065 | if (copy_from_user(page, buf, count)) |
1066 | goto out; | |
1067 | ||
1068 | length = -EINVAL; | |
1069 | if (sscanf(page, "%d", &new_value) != 1) | |
1070 | goto out; | |
1071 | ||
1072 | if (new_value) | |
1073 | new_value = 1; | |
1074 | ||
d313f948 | 1075 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1076 | length = count; |
1077 | ||
1078 | out: | |
bb003079 | 1079 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
1080 | if (page) |
1081 | free_page((unsigned long) page); | |
1082 | return length; | |
1083 | } | |
1084 | ||
9c2e08c5 | 1085 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1086 | .read = sel_read_bool, |
1087 | .write = sel_write_bool, | |
57a62c23 | 1088 | .llseek = generic_file_llseek, |
1da177e4 LT |
1089 | }; |
1090 | ||
1091 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1092 | const char __user *buf, | |
1093 | size_t count, loff_t *ppos) | |
1094 | { | |
1095 | char *page = NULL; | |
d313f948 | 1096 | ssize_t length; |
1da177e4 LT |
1097 | int new_value; |
1098 | ||
bb003079 | 1099 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1100 | |
1101 | length = task_has_security(current, SECURITY__SETBOOL); | |
1102 | if (length) | |
1103 | goto out; | |
1104 | ||
bfd51626 | 1105 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1106 | length = -ENOMEM; |
1107 | goto out; | |
1108 | } | |
1109 | if (*ppos != 0) { | |
1110 | /* No partial writes. */ | |
1111 | goto out; | |
1112 | } | |
1872981b | 1113 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1114 | if (!page) { |
1115 | length = -ENOMEM; | |
1116 | goto out; | |
1117 | } | |
1118 | ||
d313f948 | 1119 | length = -EFAULT; |
1da177e4 LT |
1120 | if (copy_from_user(page, buf, count)) |
1121 | goto out; | |
1122 | ||
1123 | length = -EINVAL; | |
1124 | if (sscanf(page, "%d", &new_value) != 1) | |
1125 | goto out; | |
1126 | ||
1872981b | 1127 | if (new_value && bool_pending_values) |
1da177e4 | 1128 | security_set_bools(bool_num, bool_pending_values); |
1da177e4 LT |
1129 | |
1130 | length = count; | |
1131 | ||
1132 | out: | |
bb003079 | 1133 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
1134 | if (page) |
1135 | free_page((unsigned long) page); | |
1136 | return length; | |
1137 | } | |
1138 | ||
9c2e08c5 | 1139 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1140 | .write = sel_commit_bools_write, |
57a62c23 | 1141 | .llseek = generic_file_llseek, |
1da177e4 LT |
1142 | }; |
1143 | ||
0c92d7c7 | 1144 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1145 | { |
0955dc03 | 1146 | struct list_head *node; |
1da177e4 | 1147 | |
2fd6b7f5 | 1148 | spin_lock(&de->d_lock); |
1da177e4 LT |
1149 | node = de->d_subdirs.next; |
1150 | while (node != &de->d_subdirs) { | |
5160ee6f | 1151 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1152 | |
1153 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1154 | list_del_init(node); |
1155 | ||
1156 | if (d->d_inode) { | |
2fd6b7f5 NP |
1157 | dget_locked_dlock(d); |
1158 | spin_unlock(&de->d_lock); | |
1159 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1160 | d_delete(d); |
1161 | simple_unlink(de->d_inode, d); | |
1162 | dput(d); | |
2fd6b7f5 NP |
1163 | spin_lock(&de->d_lock); |
1164 | } else | |
1165 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1166 | node = de->d_subdirs.next; |
1167 | } | |
1168 | ||
2fd6b7f5 | 1169 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | #define BOOL_DIR_NAME "booleans" | |
1173 | ||
1174 | static int sel_make_bools(void) | |
1175 | { | |
1176 | int i, ret = 0; | |
1177 | ssize_t len; | |
1178 | struct dentry *dentry = NULL; | |
1179 | struct dentry *dir = bool_dir; | |
1180 | struct inode *inode = NULL; | |
1181 | struct inode_security_struct *isec; | |
1182 | char **names = NULL, *page; | |
1183 | int num; | |
1184 | int *values = NULL; | |
1185 | u32 sid; | |
1186 | ||
1187 | /* remove any existing files */ | |
8007f102 XF |
1188 | for (i = 0; i < bool_num; i++) |
1189 | kfree(bool_pending_names[i]); | |
d313f948 | 1190 | kfree(bool_pending_names); |
9a5f04bf | 1191 | kfree(bool_pending_values); |
d313f948 | 1192 | bool_pending_names = NULL; |
20c19e41 | 1193 | bool_pending_values = NULL; |
1da177e4 | 1194 | |
0c92d7c7 | 1195 | sel_remove_entries(dir); |
1da177e4 | 1196 | |
1872981b EP |
1197 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1198 | if (!page) | |
1da177e4 LT |
1199 | return -ENOMEM; |
1200 | ||
1201 | ret = security_get_bools(&num, &names, &values); | |
1202 | if (ret != 0) | |
1203 | goto out; | |
1204 | ||
1205 | for (i = 0; i < num; i++) { | |
1206 | dentry = d_alloc_name(dir, names[i]); | |
1207 | if (!dentry) { | |
1208 | ret = -ENOMEM; | |
1209 | goto err; | |
1210 | } | |
1211 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
1212 | if (!inode) { | |
1213 | ret = -ENOMEM; | |
1214 | goto err; | |
1215 | } | |
1216 | ||
1217 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1218 | if (len < 0) { | |
1219 | ret = -EINVAL; | |
1220 | goto err; | |
1221 | } else if (len >= PAGE_SIZE) { | |
1222 | ret = -ENAMETOOLONG; | |
1223 | goto err; | |
1224 | } | |
1872981b EP |
1225 | isec = (struct inode_security_struct *)inode->i_security; |
1226 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1227 | if (ret) | |
1da177e4 LT |
1228 | goto err; |
1229 | isec->sid = sid; | |
1230 | isec->initialized = 1; | |
1231 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1232 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1233 | d_add(dentry, inode); |
1234 | } | |
1235 | bool_num = num; | |
d313f948 | 1236 | bool_pending_names = names; |
1da177e4 LT |
1237 | bool_pending_values = values; |
1238 | out: | |
1239 | free_page((unsigned long)page); | |
d313f948 SS |
1240 | return ret; |
1241 | err: | |
1da177e4 | 1242 | if (names) { |
9a5f04bf JJ |
1243 | for (i = 0; i < num; i++) |
1244 | kfree(names[i]); | |
1da177e4 LT |
1245 | kfree(names); |
1246 | } | |
20c19e41 | 1247 | kfree(values); |
0c92d7c7 | 1248 | sel_remove_entries(dir); |
1da177e4 LT |
1249 | ret = -ENOMEM; |
1250 | goto out; | |
1251 | } | |
1252 | ||
1253 | #define NULL_FILE_NAME "null" | |
1254 | ||
1872981b | 1255 | struct dentry *selinux_null; |
1da177e4 LT |
1256 | |
1257 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1258 | size_t count, loff_t *ppos) | |
1259 | { | |
1260 | char tmpbuf[TMPBUFLEN]; | |
1261 | ssize_t length; | |
1262 | ||
1263 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1264 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1265 | } | |
1266 | ||
1872981b EP |
1267 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1268 | const char __user *buf, | |
1da177e4 LT |
1269 | size_t count, loff_t *ppos) |
1270 | ||
1271 | { | |
1272 | char *page; | |
1273 | ssize_t ret; | |
1274 | int new_value; | |
1275 | ||
bfd51626 | 1276 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1277 | ret = -ENOMEM; |
1278 | goto out; | |
1279 | } | |
1280 | ||
1281 | if (*ppos != 0) { | |
1282 | /* No partial writes. */ | |
1283 | ret = -EINVAL; | |
1284 | goto out; | |
1285 | } | |
1286 | ||
1872981b | 1287 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1288 | if (!page) { |
1289 | ret = -ENOMEM; | |
1290 | goto out; | |
1291 | } | |
1292 | ||
1293 | if (copy_from_user(page, buf, count)) { | |
1294 | ret = -EFAULT; | |
1295 | goto out_free; | |
1296 | } | |
1297 | ||
1298 | if (sscanf(page, "%u", &new_value) != 1) { | |
1299 | ret = -EINVAL; | |
1300 | goto out; | |
1301 | } | |
1302 | ||
1303 | if (new_value != avc_cache_threshold) { | |
1304 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1305 | if (ret) | |
1306 | goto out_free; | |
1307 | avc_cache_threshold = new_value; | |
1308 | } | |
1309 | ret = count; | |
1310 | out_free: | |
1311 | free_page((unsigned long)page); | |
1312 | out: | |
1313 | return ret; | |
1314 | } | |
1315 | ||
1316 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1317 | size_t count, loff_t *ppos) | |
1318 | { | |
1319 | char *page; | |
1320 | ssize_t ret = 0; | |
1321 | ||
1322 | page = (char *)__get_free_page(GFP_KERNEL); | |
1323 | if (!page) { | |
1324 | ret = -ENOMEM; | |
1325 | goto out; | |
1326 | } | |
1327 | ret = avc_get_hash_stats(page); | |
1328 | if (ret >= 0) | |
1329 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1330 | free_page((unsigned long)page); | |
1331 | out: | |
1332 | return ret; | |
1333 | } | |
1334 | ||
9c2e08c5 | 1335 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1336 | .read = sel_read_avc_cache_threshold, |
1337 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1338 | .llseek = generic_file_llseek, |
1da177e4 LT |
1339 | }; |
1340 | ||
9c2e08c5 | 1341 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1342 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1343 | .llseek = generic_file_llseek, |
1da177e4 LT |
1344 | }; |
1345 | ||
1346 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1347 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1348 | { | |
1349 | int cpu; | |
1350 | ||
4f4b6c1a | 1351 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1352 | if (!cpu_possible(cpu)) |
1353 | continue; | |
1354 | *idx = cpu + 1; | |
1355 | return &per_cpu(avc_cache_stats, cpu); | |
1356 | } | |
1357 | return NULL; | |
1358 | } | |
1359 | ||
1360 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1361 | { | |
1362 | loff_t n = *pos - 1; | |
1363 | ||
1364 | if (*pos == 0) | |
1365 | return SEQ_START_TOKEN; | |
1366 | ||
1367 | return sel_avc_get_stat_idx(&n); | |
1368 | } | |
1369 | ||
1370 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1371 | { | |
1372 | return sel_avc_get_stat_idx(pos); | |
1373 | } | |
1374 | ||
1375 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1376 | { | |
1377 | struct avc_cache_stats *st = v; | |
1378 | ||
1379 | if (v == SEQ_START_TOKEN) | |
1380 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1381 | "frees\n"); | |
1382 | else | |
1383 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1384 | st->hits, st->misses, st->allocations, | |
1385 | st->reclaims, st->frees); | |
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1390 | { } | |
1391 | ||
1996a109 | 1392 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1393 | .start = sel_avc_stats_seq_start, |
1394 | .next = sel_avc_stats_seq_next, | |
1395 | .show = sel_avc_stats_seq_show, | |
1396 | .stop = sel_avc_stats_seq_stop, | |
1397 | }; | |
1398 | ||
1399 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1400 | { | |
1401 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1402 | } | |
1403 | ||
9c2e08c5 | 1404 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1405 | .open = sel_open_avc_cache_stats, |
1406 | .read = seq_read, | |
1407 | .llseek = seq_lseek, | |
1408 | .release = seq_release, | |
1409 | }; | |
1410 | #endif | |
1411 | ||
1412 | static int sel_make_avc_files(struct dentry *dir) | |
1413 | { | |
1414 | int i, ret = 0; | |
1415 | static struct tree_descr files[] = { | |
1416 | { "cache_threshold", | |
1417 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1418 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1419 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1420 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1421 | #endif | |
1422 | }; | |
1423 | ||
6e20a64a | 1424 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1425 | struct inode *inode; |
1426 | struct dentry *dentry; | |
1427 | ||
1428 | dentry = d_alloc_name(dir, files[i].name); | |
1429 | if (!dentry) { | |
1430 | ret = -ENOMEM; | |
d6aafa65 | 1431 | goto out; |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1435 | if (!inode) { | |
1436 | ret = -ENOMEM; | |
d6aafa65 | 1437 | goto out; |
1da177e4 LT |
1438 | } |
1439 | inode->i_fop = files[i].ops; | |
6174eafc | 1440 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1441 | d_add(dentry, inode); |
1442 | } | |
1443 | out: | |
1444 | return ret; | |
1da177e4 LT |
1445 | } |
1446 | ||
1872981b | 1447 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1448 | size_t count, loff_t *ppos) |
1449 | { | |
1450 | struct inode *inode; | |
1451 | char *con; | |
1452 | u32 sid, len; | |
1453 | ssize_t ret; | |
1454 | ||
1455 | inode = file->f_path.dentry->d_inode; | |
1456 | sid = inode->i_ino&SEL_INO_MASK; | |
1457 | ret = security_sid_to_context(sid, &con, &len); | |
1458 | if (ret < 0) | |
1459 | return ret; | |
1460 | ||
1461 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1462 | kfree(con); | |
1463 | return ret; | |
1464 | } | |
1465 | ||
1466 | static const struct file_operations sel_initcon_ops = { | |
1467 | .read = sel_read_initcon, | |
57a62c23 | 1468 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1469 | }; |
1470 | ||
1471 | static int sel_make_initcon_files(struct dentry *dir) | |
1472 | { | |
1473 | int i, ret = 0; | |
1474 | ||
1475 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1476 | struct inode *inode; | |
1477 | struct dentry *dentry; | |
1478 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
1479 | if (!dentry) { | |
1480 | ret = -ENOMEM; | |
1481 | goto out; | |
1482 | } | |
1483 | ||
1484 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1485 | if (!inode) { | |
1486 | ret = -ENOMEM; | |
1487 | goto out; | |
1488 | } | |
1489 | inode->i_fop = &sel_initcon_ops; | |
1490 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1491 | d_add(dentry, inode); | |
1492 | } | |
1493 | out: | |
1494 | return ret; | |
1495 | } | |
1496 | ||
e47c8fc5 CP |
1497 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1498 | { | |
1499 | return a / b - (a % b < 0); | |
1500 | } | |
1501 | ||
1502 | static inline unsigned long sel_class_to_ino(u16 class) | |
1503 | { | |
1504 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1505 | } | |
1506 | ||
1507 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1508 | { | |
1509 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1510 | } | |
1511 | ||
1512 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1513 | { | |
1514 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1515 | } | |
1516 | ||
1517 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1518 | { | |
1519 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1520 | } | |
1521 | ||
1872981b | 1522 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1523 | size_t count, loff_t *ppos) |
1524 | { | |
1525 | ssize_t rc, len; | |
1526 | char *page; | |
1527 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1528 | ||
1529 | page = (char *)__get_free_page(GFP_KERNEL); | |
1530 | if (!page) { | |
1531 | rc = -ENOMEM; | |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1536 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1537 | free_page((unsigned long)page); | |
1538 | out: | |
1539 | return rc; | |
1540 | } | |
1541 | ||
1542 | static const struct file_operations sel_class_ops = { | |
1543 | .read = sel_read_class, | |
57a62c23 | 1544 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1545 | }; |
1546 | ||
1872981b | 1547 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1548 | size_t count, loff_t *ppos) |
1549 | { | |
1550 | ssize_t rc, len; | |
1551 | char *page; | |
1552 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1553 | ||
1554 | page = (char *)__get_free_page(GFP_KERNEL); | |
1555 | if (!page) { | |
1556 | rc = -ENOMEM; | |
1557 | goto out; | |
1558 | } | |
1559 | ||
1872981b | 1560 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); |
e47c8fc5 CP |
1561 | rc = simple_read_from_buffer(buf, count, ppos, page, len); |
1562 | free_page((unsigned long)page); | |
1563 | out: | |
1564 | return rc; | |
1565 | } | |
1566 | ||
1567 | static const struct file_operations sel_perm_ops = { | |
1568 | .read = sel_read_perm, | |
57a62c23 | 1569 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1570 | }; |
1571 | ||
3bb56b25 PM |
1572 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1573 | size_t count, loff_t *ppos) | |
1574 | { | |
1575 | int value; | |
1576 | char tmpbuf[TMPBUFLEN]; | |
1577 | ssize_t length; | |
1578 | unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; | |
1579 | ||
1580 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1581 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1582 | ||
1583 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1584 | } | |
1585 | ||
1586 | static const struct file_operations sel_policycap_ops = { | |
1587 | .read = sel_read_policycap, | |
57a62c23 | 1588 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1589 | }; |
1590 | ||
e47c8fc5 CP |
1591 | static int sel_make_perm_files(char *objclass, int classvalue, |
1592 | struct dentry *dir) | |
1593 | { | |
1594 | int i, rc = 0, nperms; | |
1595 | char **perms; | |
1596 | ||
1597 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1598 | if (rc) | |
1599 | goto out; | |
1600 | ||
1601 | for (i = 0; i < nperms; i++) { | |
1602 | struct inode *inode; | |
1603 | struct dentry *dentry; | |
1604 | ||
1605 | dentry = d_alloc_name(dir, perms[i]); | |
1606 | if (!dentry) { | |
1607 | rc = -ENOMEM; | |
1608 | goto out1; | |
1609 | } | |
1610 | ||
1611 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1612 | if (!inode) { | |
1613 | rc = -ENOMEM; | |
1614 | goto out1; | |
1615 | } | |
1616 | inode->i_fop = &sel_perm_ops; | |
1617 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1618 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1619 | d_add(dentry, inode); |
1620 | } | |
1621 | ||
1622 | out1: | |
1623 | for (i = 0; i < nperms; i++) | |
1624 | kfree(perms[i]); | |
1625 | kfree(perms); | |
1626 | out: | |
1627 | return rc; | |
1628 | } | |
1629 | ||
1630 | static int sel_make_class_dir_entries(char *classname, int index, | |
1631 | struct dentry *dir) | |
1632 | { | |
1633 | struct dentry *dentry = NULL; | |
1634 | struct inode *inode = NULL; | |
1635 | int rc; | |
1636 | ||
1637 | dentry = d_alloc_name(dir, "index"); | |
1638 | if (!dentry) { | |
1639 | rc = -ENOMEM; | |
1640 | goto out; | |
1641 | } | |
1642 | ||
1643 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1644 | if (!inode) { | |
1645 | rc = -ENOMEM; | |
1646 | goto out; | |
1647 | } | |
1648 | ||
1649 | inode->i_fop = &sel_class_ops; | |
1650 | inode->i_ino = sel_class_to_ino(index); | |
1651 | d_add(dentry, inode); | |
1652 | ||
1653 | dentry = d_alloc_name(dir, "perms"); | |
1654 | if (!dentry) { | |
1655 | rc = -ENOMEM; | |
1656 | goto out; | |
1657 | } | |
1658 | ||
1659 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1660 | if (rc) | |
1661 | goto out; | |
1662 | ||
1663 | rc = sel_make_perm_files(classname, index, dentry); | |
1664 | ||
1665 | out: | |
1666 | return rc; | |
1667 | } | |
1668 | ||
1669 | static void sel_remove_classes(void) | |
1670 | { | |
1671 | struct list_head *class_node; | |
1672 | ||
1673 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1674 | struct dentry *class_subdir = list_entry(class_node, | |
1675 | struct dentry, d_u.d_child); | |
1676 | struct list_head *class_subdir_node; | |
1677 | ||
1678 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1679 | struct dentry *d = list_entry(class_subdir_node, | |
1680 | struct dentry, d_u.d_child); | |
1681 | ||
1682 | if (d->d_inode) | |
1683 | if (d->d_inode->i_mode & S_IFDIR) | |
1684 | sel_remove_entries(d); | |
1685 | } | |
1686 | ||
1687 | sel_remove_entries(class_subdir); | |
1688 | } | |
1689 | ||
1690 | sel_remove_entries(class_dir); | |
1691 | } | |
1692 | ||
1693 | static int sel_make_classes(void) | |
1694 | { | |
1695 | int rc = 0, nclasses, i; | |
1696 | char **classes; | |
1697 | ||
1698 | /* delete any existing entries */ | |
1699 | sel_remove_classes(); | |
1700 | ||
1701 | rc = security_get_classes(&classes, &nclasses); | |
1702 | if (rc < 0) | |
1703 | goto out; | |
1704 | ||
1705 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1706 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1707 | |
1708 | for (i = 0; i < nclasses; i++) { | |
1709 | struct dentry *class_name_dir; | |
1710 | ||
1711 | class_name_dir = d_alloc_name(class_dir, classes[i]); | |
1712 | if (!class_name_dir) { | |
1713 | rc = -ENOMEM; | |
1714 | goto out1; | |
1715 | } | |
1716 | ||
1717 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1718 | &last_class_ino); | |
1719 | if (rc) | |
1720 | goto out1; | |
1721 | ||
1722 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1723 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1724 | class_name_dir); |
1725 | if (rc) | |
1726 | goto out1; | |
1727 | } | |
1728 | ||
1729 | out1: | |
1730 | for (i = 0; i < nclasses; i++) | |
1731 | kfree(classes[i]); | |
1732 | kfree(classes); | |
1733 | out: | |
1734 | return rc; | |
1735 | } | |
1736 | ||
3bb56b25 PM |
1737 | static int sel_make_policycap(void) |
1738 | { | |
1739 | unsigned int iter; | |
1740 | struct dentry *dentry = NULL; | |
1741 | struct inode *inode = NULL; | |
1742 | ||
1743 | sel_remove_entries(policycap_dir); | |
1744 | ||
1745 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1746 | if (iter < ARRAY_SIZE(policycap_names)) | |
1747 | dentry = d_alloc_name(policycap_dir, | |
1748 | policycap_names[iter]); | |
1749 | else | |
1750 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1751 | ||
1752 | if (dentry == NULL) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1756 | if (inode == NULL) | |
1757 | return -ENOMEM; | |
1758 | ||
1759 | inode->i_fop = &sel_policycap_ops; | |
1760 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1761 | d_add(dentry, inode); | |
1762 | } | |
1763 | ||
1764 | return 0; | |
1765 | } | |
1766 | ||
0dd4ae51 CP |
1767 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1768 | unsigned long *ino) | |
1da177e4 LT |
1769 | { |
1770 | int ret = 0; | |
1771 | struct inode *inode; | |
1772 | ||
edb20fb5 | 1773 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
1da177e4 LT |
1774 | if (!inode) { |
1775 | ret = -ENOMEM; | |
1776 | goto out; | |
1777 | } | |
1778 | inode->i_op = &simple_dir_inode_operations; | |
1779 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1780 | inode->i_ino = ++(*ino); |
40e906f8 | 1781 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1782 | inc_nlink(inode); |
1da177e4 | 1783 | d_add(dentry, inode); |
edb20fb5 | 1784 | /* bump link count on parent directory, too */ |
d8c76e6f | 1785 | inc_nlink(dir); |
1da177e4 LT |
1786 | out: |
1787 | return ret; | |
1788 | } | |
1789 | ||
1872981b | 1790 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1791 | { |
1792 | int ret; | |
1793 | struct dentry *dentry; | |
edb20fb5 | 1794 | struct inode *inode, *root_inode; |
1da177e4 LT |
1795 | struct inode_security_struct *isec; |
1796 | ||
1797 | static struct tree_descr selinux_files[] = { | |
1798 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1799 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1800 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1801 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1802 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1803 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1804 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1805 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1806 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1807 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1808 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1809 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1810 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1811 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1812 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1813 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
cee74f47 | 1814 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, |
1da177e4 LT |
1815 | /* last one */ {""} |
1816 | }; | |
1817 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1818 | if (ret) | |
161ce45a | 1819 | goto err; |
1da177e4 | 1820 | |
edb20fb5 JM |
1821 | root_inode = sb->s_root->d_inode; |
1822 | ||
1da177e4 | 1823 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
161ce45a JM |
1824 | if (!dentry) { |
1825 | ret = -ENOMEM; | |
1826 | goto err; | |
1827 | } | |
1da177e4 | 1828 | |
0dd4ae51 | 1829 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1830 | if (ret) |
161ce45a | 1831 | goto err; |
cde174a8 | 1832 | |
1da177e4 | 1833 | bool_dir = dentry; |
1da177e4 LT |
1834 | |
1835 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
161ce45a JM |
1836 | if (!dentry) { |
1837 | ret = -ENOMEM; | |
1838 | goto err; | |
1839 | } | |
1da177e4 LT |
1840 | |
1841 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
161ce45a JM |
1842 | if (!inode) { |
1843 | ret = -ENOMEM; | |
1844 | goto err; | |
1845 | } | |
6174eafc | 1846 | inode->i_ino = ++sel_last_ino; |
1872981b | 1847 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1848 | isec->sid = SECINITSID_DEVNULL; |
1849 | isec->sclass = SECCLASS_CHR_FILE; | |
1850 | isec->initialized = 1; | |
1851 | ||
1852 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1853 | d_add(dentry, inode); | |
1854 | selinux_null = dentry; | |
1855 | ||
1856 | dentry = d_alloc_name(sb->s_root, "avc"); | |
161ce45a JM |
1857 | if (!dentry) { |
1858 | ret = -ENOMEM; | |
1859 | goto err; | |
1860 | } | |
1da177e4 | 1861 | |
0dd4ae51 | 1862 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1863 | if (ret) |
161ce45a | 1864 | goto err; |
1da177e4 LT |
1865 | |
1866 | ret = sel_make_avc_files(dentry); | |
1867 | if (ret) | |
161ce45a | 1868 | goto err; |
f0ee2e46 JC |
1869 | |
1870 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); | |
1871 | if (!dentry) { | |
1872 | ret = -ENOMEM; | |
1873 | goto err; | |
1874 | } | |
1875 | ||
0dd4ae51 | 1876 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1877 | if (ret) |
1878 | goto err; | |
1879 | ||
1880 | ret = sel_make_initcon_files(dentry); | |
1881 | if (ret) | |
1882 | goto err; | |
1883 | ||
e47c8fc5 CP |
1884 | dentry = d_alloc_name(sb->s_root, "class"); |
1885 | if (!dentry) { | |
1886 | ret = -ENOMEM; | |
1887 | goto err; | |
1888 | } | |
1889 | ||
1890 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1891 | if (ret) | |
1892 | goto err; | |
1893 | ||
1894 | class_dir = dentry; | |
1895 | ||
3bb56b25 PM |
1896 | dentry = d_alloc_name(sb->s_root, "policy_capabilities"); |
1897 | if (!dentry) { | |
1898 | ret = -ENOMEM; | |
1899 | goto err; | |
1900 | } | |
1901 | ||
1902 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1903 | if (ret) | |
1904 | goto err; | |
1905 | ||
1906 | policycap_dir = dentry; | |
1907 | ||
1da177e4 | 1908 | out: |
161ce45a JM |
1909 | return ret; |
1910 | err: | |
744ba35e EP |
1911 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1912 | __func__); | |
161ce45a | 1913 | goto out; |
1da177e4 LT |
1914 | } |
1915 | ||
fc14f2fe AV |
1916 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1917 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1918 | { |
fc14f2fe | 1919 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1920 | } |
1921 | ||
1922 | static struct file_system_type sel_fs_type = { | |
1923 | .name = "selinuxfs", | |
fc14f2fe | 1924 | .mount = sel_mount, |
1da177e4 LT |
1925 | .kill_sb = kill_litter_super, |
1926 | }; | |
1927 | ||
1928 | struct vfsmount *selinuxfs_mount; | |
1929 | ||
1930 | static int __init init_sel_fs(void) | |
1931 | { | |
1932 | int err; | |
1933 | ||
1934 | if (!selinux_enabled) | |
1935 | return 0; | |
1936 | err = register_filesystem(&sel_fs_type); | |
1937 | if (!err) { | |
1938 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1939 | if (IS_ERR(selinuxfs_mount)) { | |
1940 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1941 | err = PTR_ERR(selinuxfs_mount); | |
1942 | selinuxfs_mount = NULL; | |
1943 | } | |
1944 | } | |
1945 | return err; | |
1946 | } | |
1947 | ||
1948 | __initcall(init_sel_fs); | |
1949 | ||
1950 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1951 | void exit_sel_fs(void) | |
1952 | { | |
1953 | unregister_filesystem(&sel_fs_type); | |
1954 | } | |
1955 | #endif |