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> |
7a627e3b | 31 | #include <linux/kobject.h> |
0f7e4c33 | 32 | #include <linux/ctype.h> |
1da177e4 LT |
33 | |
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 | ||
3bb56b25 PM |
44 | /* Policy capability filenames */ |
45 | static char *policycap_names[] = { | |
b0c636b9 EP |
46 | "network_peer_controls", |
47 | "open_perms" | |
3bb56b25 PM |
48 | }; |
49 | ||
1da177e4 LT |
50 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
51 | ||
52 | static int __init checkreqprot_setup(char *str) | |
53 | { | |
f5269710 EP |
54 | unsigned long checkreqprot; |
55 | if (!strict_strtoul(str, 0, &checkreqprot)) | |
56 | selinux_checkreqprot = checkreqprot ? 1 : 0; | |
1da177e4 LT |
57 | return 1; |
58 | } | |
59 | __setup("checkreqprot=", checkreqprot_setup); | |
60 | ||
bb003079 | 61 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
62 | |
63 | /* global data for booleans */ | |
1872981b EP |
64 | static struct dentry *bool_dir; |
65 | static int bool_num; | |
d313f948 | 66 | static char **bool_pending_names; |
1872981b | 67 | static int *bool_pending_values; |
1da177e4 | 68 | |
e47c8fc5 | 69 | /* global data for classes */ |
1872981b | 70 | static struct dentry *class_dir; |
e47c8fc5 CP |
71 | static unsigned long last_class_ino; |
72 | ||
cee74f47 EP |
73 | static char policy_opened; |
74 | ||
3bb56b25 | 75 | /* global data for policy capabilities */ |
1872981b | 76 | static struct dentry *policycap_dir; |
3bb56b25 | 77 | |
1da177e4 LT |
78 | extern void selnl_notify_setenforce(int val); |
79 | ||
80 | /* Check whether a task is allowed to use a security operation. */ | |
81 | static int task_has_security(struct task_struct *tsk, | |
82 | u32 perms) | |
83 | { | |
c69e8d9c DH |
84 | const struct task_security_struct *tsec; |
85 | u32 sid = 0; | |
86 | ||
87 | rcu_read_lock(); | |
88 | tsec = __task_cred(tsk)->security; | |
89 | if (tsec) | |
90 | sid = tsec->sid; | |
91 | rcu_read_unlock(); | |
1da177e4 LT |
92 | if (!tsec) |
93 | return -EACCES; | |
94 | ||
c69e8d9c | 95 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
96 | SECCLASS_SECURITY, perms, NULL); |
97 | } | |
98 | ||
99 | enum 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 */ | |
1da177e4 LT |
112 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
113 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 114 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
115 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
116 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 117 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 118 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
6174eafc | 119 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
120 | }; |
121 | ||
6174eafc JC |
122 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
123 | ||
3bb56b25 PM |
124 | #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 | |
f0ee2e46 | 129 | |
1da177e4 LT |
130 | #define TMPBUFLEN 12 |
131 | static 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 | |
1872981b | 142 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
143 | size_t count, loff_t *ppos) |
144 | ||
145 | { | |
b77a493b | 146 | char *page = NULL; |
1da177e4 LT |
147 | ssize_t length; |
148 | int new_value; | |
149 | ||
b77a493b | 150 | length = -ENOMEM; |
bfd51626 | 151 | if (count >= PAGE_SIZE) |
b77a493b EP |
152 | goto out; |
153 | ||
154 | /* No partial writes. */ | |
155 | length = EINVAL; | |
156 | if (*ppos != 0) | |
157 | goto out; | |
158 | ||
159 | length = -ENOMEM; | |
1872981b | 160 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 161 | if (!page) |
b77a493b EP |
162 | goto out; |
163 | ||
1da177e4 LT |
164 | 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; | |
af601e46 | 176 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
177 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
178 | new_value, selinux_enforcing, | |
179 | audit_get_loginuid(current), | |
180 | audit_get_sessionid(current)); | |
1da177e4 LT |
181 | selinux_enforcing = new_value; |
182 | if (selinux_enforcing) | |
183 | avc_ss_reset(0); | |
184 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 185 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
186 | } |
187 | length = count; | |
188 | out: | |
189 | free_page((unsigned long) page); | |
190 | return length; | |
191 | } | |
192 | #else | |
193 | #define sel_write_enforce NULL | |
194 | #endif | |
195 | ||
9c2e08c5 | 196 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
197 | .read = sel_read_enforce, |
198 | .write = sel_write_enforce, | |
57a62c23 | 199 | .llseek = generic_file_llseek, |
1da177e4 LT |
200 | }; |
201 | ||
3f12070e EP |
202 | static 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; | |
207 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
208 | 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 | ||
215 | static const struct file_operations sel_handle_unknown_ops = { | |
216 | .read = sel_read_handle_unknown, | |
57a62c23 | 217 | .llseek = generic_file_llseek, |
3f12070e EP |
218 | }; |
219 | ||
11904167 KK |
220 | static 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 | ||
232 | static 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 | ||
244 | static 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 | ||
266 | static 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 | ||
1da177e4 | 273 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 274 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
275 | size_t count, loff_t *ppos) |
276 | ||
277 | { | |
b77a493b | 278 | char *page = NULL; |
1da177e4 LT |
279 | ssize_t length; |
280 | int new_value; | |
281 | extern int selinux_disable(void); | |
282 | ||
b77a493b | 283 | length = -ENOMEM; |
bfd51626 | 284 | if (count >= PAGE_SIZE) |
6eab04a8 | 285 | goto out; |
b77a493b EP |
286 | |
287 | /* No partial writes. */ | |
288 | length = -EINVAL; | |
289 | if (*ppos != 0) | |
290 | goto out; | |
291 | ||
292 | length = -ENOMEM; | |
1872981b | 293 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 294 | if (!page) |
b77a493b EP |
295 | goto out; |
296 | ||
1da177e4 LT |
297 | length = -EFAULT; |
298 | if (copy_from_user(page, buf, count)) | |
299 | goto out; | |
300 | ||
301 | length = -EINVAL; | |
302 | if (sscanf(page, "%d", &new_value) != 1) | |
303 | goto out; | |
304 | ||
305 | if (new_value) { | |
306 | length = selinux_disable(); | |
b77a493b | 307 | if (length) |
1da177e4 | 308 | goto out; |
af601e46 | 309 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
310 | "selinux=0 auid=%u ses=%u", |
311 | audit_get_loginuid(current), | |
312 | audit_get_sessionid(current)); | |
1da177e4 LT |
313 | } |
314 | ||
315 | length = count; | |
316 | out: | |
317 | free_page((unsigned long) page); | |
318 | return length; | |
319 | } | |
320 | #else | |
321 | #define sel_write_disable NULL | |
322 | #endif | |
323 | ||
9c2e08c5 | 324 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 325 | .write = sel_write_disable, |
57a62c23 | 326 | .llseek = generic_file_llseek, |
1da177e4 LT |
327 | }; |
328 | ||
329 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 330 | size_t count, loff_t *ppos) |
1da177e4 LT |
331 | { |
332 | char tmpbuf[TMPBUFLEN]; | |
333 | ssize_t length; | |
334 | ||
335 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
336 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
337 | } | |
338 | ||
9c2e08c5 | 339 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 340 | .read = sel_read_policyvers, |
57a62c23 | 341 | .llseek = generic_file_llseek, |
1da177e4 LT |
342 | }; |
343 | ||
344 | /* declaration for sel_write_load */ | |
345 | static int sel_make_bools(void); | |
e47c8fc5 | 346 | static int sel_make_classes(void); |
3bb56b25 | 347 | static int sel_make_policycap(void); |
e47c8fc5 CP |
348 | |
349 | /* declaration for sel_make_class_dirs */ | |
350 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
351 | unsigned long *ino); | |
1da177e4 LT |
352 | |
353 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
354 | size_t count, loff_t *ppos) | |
355 | { | |
356 | char tmpbuf[TMPBUFLEN]; | |
357 | ssize_t length; | |
358 | ||
0719aaf5 GT |
359 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
360 | security_mls_enabled()); | |
1da177e4 LT |
361 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
362 | } | |
363 | ||
9c2e08c5 | 364 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 365 | .read = sel_read_mls, |
57a62c23 | 366 | .llseek = generic_file_llseek, |
1da177e4 LT |
367 | }; |
368 | ||
cee74f47 EP |
369 | struct policy_load_memory { |
370 | size_t len; | |
371 | void *data; | |
372 | }; | |
373 | ||
374 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
375 | { | |
376 | struct policy_load_memory *plm = NULL; | |
377 | int rc; | |
378 | ||
379 | BUG_ON(filp->private_data); | |
380 | ||
381 | mutex_lock(&sel_mutex); | |
382 | ||
383 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
384 | if (rc) | |
385 | goto err; | |
386 | ||
387 | rc = -EBUSY; | |
388 | if (policy_opened) | |
389 | goto err; | |
390 | ||
391 | rc = -ENOMEM; | |
392 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
393 | if (!plm) | |
394 | goto err; | |
395 | ||
396 | if (i_size_read(inode) != security_policydb_len()) { | |
397 | mutex_lock(&inode->i_mutex); | |
398 | i_size_write(inode, security_policydb_len()); | |
399 | mutex_unlock(&inode->i_mutex); | |
400 | } | |
401 | ||
402 | rc = security_read_policy(&plm->data, &plm->len); | |
403 | if (rc) | |
404 | goto err; | |
405 | ||
406 | policy_opened = 1; | |
407 | ||
408 | filp->private_data = plm; | |
409 | ||
410 | mutex_unlock(&sel_mutex); | |
411 | ||
412 | return 0; | |
413 | err: | |
414 | mutex_unlock(&sel_mutex); | |
415 | ||
416 | if (plm) | |
417 | vfree(plm->data); | |
418 | kfree(plm); | |
419 | return rc; | |
420 | } | |
421 | ||
422 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
423 | { | |
424 | struct policy_load_memory *plm = filp->private_data; | |
425 | ||
426 | BUG_ON(!plm); | |
427 | ||
428 | policy_opened = 0; | |
429 | ||
430 | vfree(plm->data); | |
431 | kfree(plm); | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
436 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
437 | size_t count, loff_t *ppos) | |
438 | { | |
439 | struct policy_load_memory *plm = filp->private_data; | |
440 | int ret; | |
441 | ||
442 | mutex_lock(&sel_mutex); | |
443 | ||
444 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
445 | if (ret) | |
446 | goto out; | |
447 | ||
448 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
449 | out: | |
450 | mutex_unlock(&sel_mutex); | |
451 | return ret; | |
452 | } | |
453 | ||
845ca30f EP |
454 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
455 | struct vm_fault *vmf) | |
456 | { | |
457 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
458 | unsigned long offset; | |
459 | struct page *page; | |
460 | ||
461 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
462 | return VM_FAULT_SIGBUS; | |
463 | ||
464 | offset = vmf->pgoff << PAGE_SHIFT; | |
465 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
466 | return VM_FAULT_SIGBUS; | |
467 | ||
468 | page = vmalloc_to_page(plm->data + offset); | |
469 | get_page(page); | |
470 | ||
471 | vmf->page = page; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
476 | static struct vm_operations_struct sel_mmap_policy_ops = { | |
477 | .fault = sel_mmap_policy_fault, | |
478 | .page_mkwrite = sel_mmap_policy_fault, | |
479 | }; | |
480 | ||
481 | int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) | |
482 | { | |
483 | if (vma->vm_flags & VM_SHARED) { | |
484 | /* do not allow mprotect to make mapping writable */ | |
485 | vma->vm_flags &= ~VM_MAYWRITE; | |
486 | ||
487 | if (vma->vm_flags & VM_WRITE) | |
488 | return -EACCES; | |
489 | } | |
490 | ||
491 | vma->vm_flags |= VM_RESERVED; | |
492 | vma->vm_ops = &sel_mmap_policy_ops; | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
cee74f47 EP |
497 | static const struct file_operations sel_policy_ops = { |
498 | .open = sel_open_policy, | |
499 | .read = sel_read_policy, | |
845ca30f | 500 | .mmap = sel_mmap_policy, |
cee74f47 EP |
501 | .release = sel_release_policy, |
502 | }; | |
503 | ||
1872981b | 504 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
505 | size_t count, loff_t *ppos) |
506 | ||
507 | { | |
1da177e4 LT |
508 | ssize_t length; |
509 | void *data = NULL; | |
510 | ||
bb003079 | 511 | mutex_lock(&sel_mutex); |
1da177e4 LT |
512 | |
513 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
514 | if (length) | |
515 | goto out; | |
516 | ||
b77a493b EP |
517 | /* No partial writes. */ |
518 | length = -EINVAL; | |
519 | if (*ppos != 0) | |
1da177e4 | 520 | goto out; |
1da177e4 | 521 | |
b77a493b EP |
522 | length = -EFBIG; |
523 | if (count > 64 * 1024 * 1024) | |
524 | goto out; | |
525 | ||
526 | length = -ENOMEM; | |
527 | data = vmalloc(count); | |
528 | if (!data) | |
1da177e4 | 529 | goto out; |
1da177e4 LT |
530 | |
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 | ||
b77a493b EP |
539 | length = sel_make_bools(); |
540 | if (length) | |
e47c8fc5 | 541 | goto out1; |
e47c8fc5 | 542 | |
b77a493b EP |
543 | length = sel_make_classes(); |
544 | if (length) | |
3bb56b25 | 545 | goto out1; |
3bb56b25 | 546 | |
b77a493b EP |
547 | length = sel_make_policycap(); |
548 | if (length) | |
549 | goto out1; | |
550 | ||
551 | length = count; | |
e47c8fc5 CP |
552 | |
553 | out1: | |
af601e46 | 554 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b EP |
555 | "policy loaded auid=%u ses=%u", |
556 | audit_get_loginuid(current), | |
557 | audit_get_sessionid(current)); | |
1da177e4 | 558 | out: |
bb003079 | 559 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
560 | vfree(data); |
561 | return length; | |
562 | } | |
563 | ||
9c2e08c5 | 564 | static const struct file_operations sel_load_ops = { |
1da177e4 | 565 | .write = sel_write_load, |
57a62c23 | 566 | .llseek = generic_file_llseek, |
1da177e4 LT |
567 | }; |
568 | ||
1872981b | 569 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 570 | { |
b77a493b | 571 | char *canon = NULL; |
ce9982d0 | 572 | u32 sid, len; |
1da177e4 LT |
573 | ssize_t length; |
574 | ||
575 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
576 | if (length) | |
b77a493b | 577 | goto out; |
1da177e4 | 578 | |
ce9982d0 | 579 | length = security_context_to_sid(buf, size, &sid); |
b77a493b EP |
580 | if (length) |
581 | goto out; | |
1da177e4 | 582 | |
ce9982d0 | 583 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
584 | if (length) |
585 | goto out; | |
ce9982d0 | 586 | |
b77a493b | 587 | length = -ERANGE; |
ce9982d0 | 588 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
589 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
590 | "payload max\n", __func__, len); | |
1da177e4 | 591 | goto out; |
ce9982d0 | 592 | } |
1da177e4 | 593 | |
ce9982d0 SS |
594 | memcpy(buf, canon, len); |
595 | length = len; | |
1da177e4 | 596 | out: |
ce9982d0 | 597 | kfree(canon); |
1da177e4 LT |
598 | return length; |
599 | } | |
600 | ||
1da177e4 LT |
601 | static 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 | ||
1872981b | 611 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
612 | size_t count, loff_t *ppos) |
613 | { | |
b77a493b | 614 | char *page = NULL; |
1da177e4 LT |
615 | ssize_t length; |
616 | unsigned int new_value; | |
617 | ||
618 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
619 | if (length) | |
b77a493b | 620 | goto out; |
1da177e4 | 621 | |
b77a493b | 622 | length = -ENOMEM; |
bfd51626 | 623 | if (count >= PAGE_SIZE) |
b77a493b EP |
624 | goto out; |
625 | ||
626 | /* No partial writes. */ | |
627 | length = -EINVAL; | |
628 | if (*ppos != 0) | |
629 | goto out; | |
630 | ||
631 | length = -ENOMEM; | |
1872981b | 632 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 633 | if (!page) |
b77a493b EP |
634 | goto out; |
635 | ||
1da177e4 LT |
636 | 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; | |
646 | out: | |
647 | free_page((unsigned long) page); | |
648 | return length; | |
649 | } | |
9c2e08c5 | 650 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
651 | .read = sel_read_checkreqprot, |
652 | .write = sel_write_checkreqprot, | |
57a62c23 | 653 | .llseek = generic_file_llseek, |
1da177e4 LT |
654 | }; |
655 | ||
656 | /* | |
657 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
658 | */ | |
1872981b EP |
659 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
660 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
661 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
662 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
663 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
664 | |
665 | static 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, | |
ce9982d0 | 671 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
672 | }; |
673 | ||
674 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
675 | { | |
1872981b | 676 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
677 | char *data; |
678 | ssize_t rv; | |
679 | ||
6e20a64a | 680 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
681 | return -EINVAL; |
682 | ||
683 | data = simple_transaction_get(file, buf, size); | |
684 | if (IS_ERR(data)) | |
685 | return PTR_ERR(data); | |
686 | ||
1872981b EP |
687 | rv = write_op[ino](file, data, size); |
688 | if (rv > 0) { | |
1da177e4 LT |
689 | simple_transaction_set(file, rv); |
690 | rv = size; | |
691 | } | |
692 | return rv; | |
693 | } | |
694 | ||
9c2e08c5 | 695 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
696 | .write = selinux_transaction_write, |
697 | .read = simple_transaction_read, | |
698 | .release = simple_transaction_release, | |
57a62c23 | 699 | .llseek = generic_file_llseek, |
1da177e4 LT |
700 | }; |
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 | ||
1872981b | 708 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 709 | { |
b77a493b | 710 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
711 | u32 ssid, tsid; |
712 | u16 tclass; | |
1da177e4 LT |
713 | struct av_decision avd; |
714 | ssize_t length; | |
715 | ||
716 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
717 | if (length) | |
b77a493b | 718 | goto out; |
1da177e4 LT |
719 | |
720 | length = -ENOMEM; | |
c1a7368a | 721 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 722 | if (!scon) |
b77a493b | 723 | goto out; |
1da177e4 | 724 | |
b77a493b | 725 | length = -ENOMEM; |
c1a7368a | 726 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
727 | if (!tcon) |
728 | goto out; | |
1da177e4 LT |
729 | |
730 | length = -EINVAL; | |
19439d05 | 731 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 732 | goto out; |
1da177e4 | 733 | |
c1a7368a | 734 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
735 | if (length) |
736 | goto out; | |
737 | ||
c1a7368a | 738 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
739 | if (length) |
740 | goto out; | |
1da177e4 | 741 | |
19439d05 | 742 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
743 | |
744 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 745 | "%x %x %x %x %u %x", |
f1c6381a | 746 | avd.allowed, 0xffffffff, |
1da177e4 | 747 | avd.auditallow, avd.auditdeny, |
8a6f83af | 748 | avd.seqno, avd.flags); |
1da177e4 | 749 | out: |
b77a493b | 750 | kfree(tcon); |
1da177e4 LT |
751 | kfree(scon); |
752 | return length; | |
753 | } | |
754 | ||
0f7e4c33 KK |
755 | static inline int hexcode_to_int(int code) { |
756 | if (code == '\0' || !isxdigit(code)) | |
757 | return -1; | |
758 | if (isdigit(code)) | |
759 | return code - '0'; | |
760 | return tolower(code) - 'a' + 10; | |
761 | } | |
762 | ||
1872981b | 763 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 764 | { |
b77a493b | 765 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 766 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
767 | u32 ssid, tsid, newsid; |
768 | u16 tclass; | |
769 | ssize_t length; | |
b77a493b | 770 | char *newcon = NULL; |
1da177e4 | 771 | u32 len; |
f50a3ec9 | 772 | int nargs; |
1da177e4 LT |
773 | |
774 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
775 | if (length) | |
b77a493b | 776 | goto out; |
1da177e4 LT |
777 | |
778 | length = -ENOMEM; | |
c1a7368a | 779 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 780 | if (!scon) |
b77a493b | 781 | goto out; |
1da177e4 | 782 | |
b77a493b | 783 | length = -ENOMEM; |
c1a7368a | 784 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
785 | if (!tcon) |
786 | goto out; | |
1da177e4 | 787 | |
f50a3ec9 KK |
788 | length = -ENOMEM; |
789 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
790 | if (!namebuf) | |
791 | goto out; | |
792 | ||
1da177e4 | 793 | length = -EINVAL; |
f50a3ec9 KK |
794 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
795 | if (nargs < 3 || nargs > 4) | |
b77a493b | 796 | goto out; |
0f7e4c33 KK |
797 | if (nargs == 4) { |
798 | /* | |
799 | * If and when the name of new object to be queried contains | |
800 | * either whitespace or multibyte characters, they shall be | |
801 | * encoded based on the percentage-encoding rule. | |
802 | * If not encoded, the sscanf logic picks up only left-half | |
803 | * of the supplied name; splitted by a whitespace unexpectedly. | |
804 | */ | |
805 | char *r, *w; | |
806 | int c1, c2; | |
807 | ||
808 | r = w = namebuf; | |
809 | do { | |
810 | c1 = *r++; | |
811 | if (c1 == '+') | |
812 | c1 = ' '; | |
813 | else if (c1 == '%') { | |
814 | if ((c1 = hexcode_to_int(*r++)) < 0) | |
815 | goto out; | |
816 | if ((c2 = hexcode_to_int(*r++)) < 0) | |
817 | goto out; | |
818 | c1 = (c1 << 4) | c2; | |
819 | } | |
820 | *w++ = c1; | |
821 | } while (c1 != '\0'); | |
822 | ||
f50a3ec9 | 823 | objname = namebuf; |
0f7e4c33 | 824 | } |
1da177e4 | 825 | |
c1a7368a | 826 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
827 | if (length) |
828 | goto out; | |
829 | ||
c1a7368a | 830 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
831 | if (length) |
832 | goto out; | |
1da177e4 | 833 | |
f50a3ec9 KK |
834 | length = security_transition_sid_user(ssid, tsid, tclass, |
835 | objname, &newsid); | |
b77a493b EP |
836 | if (length) |
837 | goto out; | |
1da177e4 LT |
838 | |
839 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
840 | if (length) |
841 | goto out; | |
1da177e4 | 842 | |
b77a493b | 843 | length = -ERANGE; |
1da177e4 | 844 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
845 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
846 | "payload max\n", __func__, len); | |
b77a493b | 847 | goto out; |
1da177e4 LT |
848 | } |
849 | ||
850 | memcpy(buf, newcon, len); | |
851 | length = len; | |
b77a493b | 852 | out: |
1da177e4 | 853 | kfree(newcon); |
f50a3ec9 | 854 | kfree(namebuf); |
1da177e4 | 855 | kfree(tcon); |
1da177e4 LT |
856 | kfree(scon); |
857 | return length; | |
858 | } | |
859 | ||
1872981b | 860 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 861 | { |
b77a493b | 862 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
863 | u32 ssid, tsid, newsid; |
864 | u16 tclass; | |
865 | ssize_t length; | |
b77a493b | 866 | char *newcon = NULL; |
1da177e4 LT |
867 | u32 len; |
868 | ||
869 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
870 | if (length) | |
b77a493b | 871 | goto out; |
1da177e4 LT |
872 | |
873 | length = -ENOMEM; | |
c1a7368a | 874 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 875 | if (!scon) |
b77a493b | 876 | goto out; |
1da177e4 | 877 | |
b77a493b | 878 | length = -ENOMEM; |
c1a7368a | 879 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
880 | if (!tcon) |
881 | goto out; | |
1da177e4 LT |
882 | |
883 | length = -EINVAL; | |
884 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 885 | goto out; |
1da177e4 | 886 | |
c1a7368a | 887 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
888 | if (length) |
889 | goto out; | |
890 | ||
c1a7368a | 891 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
892 | if (length) |
893 | goto out; | |
1da177e4 LT |
894 | |
895 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
896 | if (length) |
897 | goto out; | |
1da177e4 LT |
898 | |
899 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
900 | if (length) |
901 | goto out; | |
1da177e4 | 902 | |
b77a493b EP |
903 | length = -ERANGE; |
904 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
905 | goto out; | |
1da177e4 LT |
906 | |
907 | memcpy(buf, newcon, len); | |
908 | length = len; | |
b77a493b | 909 | out: |
1da177e4 | 910 | kfree(newcon); |
1da177e4 | 911 | kfree(tcon); |
1da177e4 LT |
912 | kfree(scon); |
913 | return length; | |
914 | } | |
915 | ||
1872981b | 916 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 917 | { |
b77a493b EP |
918 | char *con = NULL, *user = NULL, *ptr; |
919 | u32 sid, *sids = NULL; | |
1da177e4 LT |
920 | 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) | |
6eab04a8 | 927 | goto out; |
1da177e4 LT |
928 | |
929 | length = -ENOMEM; | |
c1a7368a | 930 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 931 | if (!con) |
6eab04a8 | 932 | goto out; |
1da177e4 | 933 | |
b77a493b | 934 | length = -ENOMEM; |
c1a7368a | 935 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
936 | if (!user) |
937 | goto out; | |
1da177e4 LT |
938 | |
939 | length = -EINVAL; | |
940 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 941 | goto out; |
1da177e4 | 942 | |
c1a7368a | 943 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
b77a493b EP |
944 | if (length) |
945 | goto out; | |
1da177e4 LT |
946 | |
947 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
948 | if (length) |
949 | goto out; | |
1da177e4 LT |
950 | |
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; | |
b77a493b | 957 | goto out; |
1da177e4 LT |
958 | } |
959 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
960 | kfree(newcon); | |
961 | length = -ERANGE; | |
b77a493b | 962 | goto out; |
1da177e4 LT |
963 | } |
964 | memcpy(ptr, newcon, len); | |
965 | kfree(newcon); | |
966 | ptr += len; | |
967 | length += len; | |
968 | } | |
b77a493b | 969 | out: |
1da177e4 | 970 | kfree(sids); |
1da177e4 | 971 | kfree(user); |
1da177e4 LT |
972 | kfree(con); |
973 | return length; | |
974 | } | |
975 | ||
1872981b | 976 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 977 | { |
b77a493b | 978 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
979 | u32 ssid, tsid, newsid; |
980 | u16 tclass; | |
981 | ssize_t length; | |
b77a493b | 982 | char *newcon = NULL; |
1da177e4 LT |
983 | u32 len; |
984 | ||
985 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
986 | if (length) | |
b77a493b | 987 | goto out; |
1da177e4 LT |
988 | |
989 | length = -ENOMEM; | |
c1a7368a | 990 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 991 | if (!scon) |
6eab04a8 | 992 | goto out; |
1da177e4 | 993 | |
b77a493b | 994 | length = -ENOMEM; |
c1a7368a | 995 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
996 | if (!tcon) |
997 | goto out; | |
1da177e4 LT |
998 | |
999 | length = -EINVAL; | |
1000 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1001 | goto out; |
1da177e4 | 1002 | |
c1a7368a | 1003 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
1004 | if (length) |
1005 | goto out; | |
1006 | ||
c1a7368a | 1007 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
1008 | if (length) |
1009 | goto out; | |
1da177e4 LT |
1010 | |
1011 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1012 | if (length) |
1013 | goto out; | |
1da177e4 LT |
1014 | |
1015 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1016 | if (length) |
1017 | goto out; | |
1da177e4 | 1018 | |
b77a493b | 1019 | length = -ERANGE; |
1da177e4 | 1020 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1021 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1022 | "payload max\n", __func__, len); | |
b77a493b | 1023 | goto out; |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | memcpy(buf, newcon, len); | |
1027 | length = len; | |
b77a493b | 1028 | out: |
1da177e4 | 1029 | kfree(newcon); |
1da177e4 | 1030 | kfree(tcon); |
1da177e4 LT |
1031 | kfree(scon); |
1032 | return length; | |
1033 | } | |
1034 | ||
1035 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1036 | { | |
1037 | struct inode *ret = new_inode(sb); | |
1038 | ||
1039 | if (ret) { | |
1040 | ret->i_mode = mode; | |
1da177e4 LT |
1041 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1042 | } | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1da177e4 LT |
1046 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1047 | size_t count, loff_t *ppos) | |
1048 | { | |
1049 | char *page = NULL; | |
1050 | ssize_t length; | |
1da177e4 LT |
1051 | ssize_t ret; |
1052 | int cur_enforcing; | |
d313f948 SS |
1053 | struct inode *inode = filep->f_path.dentry->d_inode; |
1054 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1055 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1056 | |
bb003079 | 1057 | mutex_lock(&sel_mutex); |
1da177e4 | 1058 | |
b77a493b EP |
1059 | ret = -EINVAL; |
1060 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1061 | goto out; |
1da177e4 | 1062 | |
b77a493b | 1063 | ret = -ENOMEM; |
1872981b | 1064 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1065 | if (!page) |
1da177e4 | 1066 | goto out; |
1da177e4 | 1067 | |
d313f948 | 1068 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1069 | if (cur_enforcing < 0) { |
1070 | ret = cur_enforcing; | |
1071 | goto out; | |
1072 | } | |
1da177e4 | 1073 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1074 | bool_pending_values[index]); |
68bdcf28 | 1075 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1076 | out: |
bb003079 | 1077 | mutex_unlock(&sel_mutex); |
b77a493b | 1078 | free_page((unsigned long)page); |
1da177e4 LT |
1079 | return ret; |
1080 | } | |
1081 | ||
1082 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1083 | size_t count, loff_t *ppos) | |
1084 | { | |
1085 | char *page = NULL; | |
d313f948 | 1086 | ssize_t length; |
1da177e4 | 1087 | int new_value; |
d313f948 SS |
1088 | struct inode *inode = filep->f_path.dentry->d_inode; |
1089 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1090 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1091 | |
bb003079 | 1092 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1093 | |
1094 | length = task_has_security(current, SECURITY__SETBOOL); | |
1095 | if (length) | |
1096 | goto out; | |
1097 | ||
b77a493b EP |
1098 | length = -EINVAL; |
1099 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1100 | goto out; |
d313f948 | 1101 | |
b77a493b EP |
1102 | length = -ENOMEM; |
1103 | if (count >= PAGE_SIZE) | |
1da177e4 | 1104 | goto out; |
d313f948 | 1105 | |
b77a493b EP |
1106 | /* No partial writes. */ |
1107 | length = -EINVAL; | |
1108 | if (*ppos != 0) | |
1da177e4 | 1109 | goto out; |
b77a493b EP |
1110 | |
1111 | length = -ENOMEM; | |
1872981b | 1112 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1113 | if (!page) |
1da177e4 | 1114 | goto out; |
1da177e4 | 1115 | |
d313f948 | 1116 | length = -EFAULT; |
1da177e4 LT |
1117 | 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 | ||
d313f948 | 1127 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1128 | length = count; |
1129 | ||
1130 | out: | |
bb003079 | 1131 | mutex_unlock(&sel_mutex); |
b77a493b | 1132 | free_page((unsigned long) page); |
1da177e4 LT |
1133 | return length; |
1134 | } | |
1135 | ||
9c2e08c5 | 1136 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1137 | .read = sel_read_bool, |
1138 | .write = sel_write_bool, | |
57a62c23 | 1139 | .llseek = generic_file_llseek, |
1da177e4 LT |
1140 | }; |
1141 | ||
1142 | static 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; | |
d313f948 | 1147 | ssize_t length; |
1da177e4 LT |
1148 | int new_value; |
1149 | ||
bb003079 | 1150 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1151 | |
1152 | length = task_has_security(current, SECURITY__SETBOOL); | |
1153 | if (length) | |
1154 | goto out; | |
1155 | ||
b77a493b EP |
1156 | length = -ENOMEM; |
1157 | if (count >= PAGE_SIZE) | |
1da177e4 | 1158 | goto out; |
b77a493b EP |
1159 | |
1160 | /* No partial writes. */ | |
1161 | length = -EINVAL; | |
1162 | if (*ppos != 0) | |
1da177e4 | 1163 | goto out; |
b77a493b EP |
1164 | |
1165 | length = -ENOMEM; | |
1872981b | 1166 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1167 | if (!page) |
1da177e4 | 1168 | goto out; |
1da177e4 | 1169 | |
d313f948 | 1170 | length = -EFAULT; |
1da177e4 LT |
1171 | 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 | ||
b77a493b | 1178 | length = 0; |
1872981b | 1179 | if (new_value && bool_pending_values) |
b77a493b | 1180 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1181 | |
b77a493b EP |
1182 | if (!length) |
1183 | length = count; | |
1da177e4 LT |
1184 | |
1185 | out: | |
bb003079 | 1186 | mutex_unlock(&sel_mutex); |
b77a493b | 1187 | free_page((unsigned long) page); |
1da177e4 LT |
1188 | return length; |
1189 | } | |
1190 | ||
9c2e08c5 | 1191 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1192 | .write = sel_commit_bools_write, |
57a62c23 | 1193 | .llseek = generic_file_llseek, |
1da177e4 LT |
1194 | }; |
1195 | ||
0c92d7c7 | 1196 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1197 | { |
0955dc03 | 1198 | struct list_head *node; |
1da177e4 | 1199 | |
2fd6b7f5 | 1200 | spin_lock(&de->d_lock); |
1da177e4 LT |
1201 | node = de->d_subdirs.next; |
1202 | while (node != &de->d_subdirs) { | |
5160ee6f | 1203 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1204 | |
1205 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1206 | list_del_init(node); |
1207 | ||
1208 | if (d->d_inode) { | |
dc0474be | 1209 | dget_dlock(d); |
2fd6b7f5 NP |
1210 | spin_unlock(&de->d_lock); |
1211 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1212 | d_delete(d); |
1213 | simple_unlink(de->d_inode, d); | |
1214 | dput(d); | |
2fd6b7f5 NP |
1215 | spin_lock(&de->d_lock); |
1216 | } else | |
1217 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1218 | node = de->d_subdirs.next; |
1219 | } | |
1220 | ||
2fd6b7f5 | 1221 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1222 | } |
1223 | ||
1224 | #define BOOL_DIR_NAME "booleans" | |
1225 | ||
1226 | static int sel_make_bools(void) | |
1227 | { | |
b77a493b | 1228 | int i, ret; |
1da177e4 LT |
1229 | ssize_t len; |
1230 | struct dentry *dentry = NULL; | |
1231 | struct dentry *dir = bool_dir; | |
1232 | struct inode *inode = NULL; | |
1233 | struct inode_security_struct *isec; | |
1234 | char **names = NULL, *page; | |
1235 | int num; | |
1236 | int *values = NULL; | |
1237 | u32 sid; | |
1238 | ||
1239 | /* remove any existing files */ | |
8007f102 XF |
1240 | for (i = 0; i < bool_num; i++) |
1241 | kfree(bool_pending_names[i]); | |
d313f948 | 1242 | kfree(bool_pending_names); |
9a5f04bf | 1243 | kfree(bool_pending_values); |
d313f948 | 1244 | bool_pending_names = NULL; |
20c19e41 | 1245 | bool_pending_values = NULL; |
1da177e4 | 1246 | |
0c92d7c7 | 1247 | sel_remove_entries(dir); |
1da177e4 | 1248 | |
b77a493b | 1249 | ret = -ENOMEM; |
1872981b EP |
1250 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1251 | if (!page) | |
b77a493b | 1252 | goto out; |
1da177e4 LT |
1253 | |
1254 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1255 | if (ret) |
1da177e4 LT |
1256 | goto out; |
1257 | ||
1258 | for (i = 0; i < num; i++) { | |
b77a493b | 1259 | ret = -ENOMEM; |
1da177e4 | 1260 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1261 | if (!dentry) |
1262 | goto out; | |
1263 | ||
1264 | ret = -ENOMEM; | |
1da177e4 | 1265 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1266 | if (!inode) |
1267 | goto out; | |
1da177e4 | 1268 | |
b77a493b | 1269 | ret = -EINVAL; |
1da177e4 | 1270 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1271 | if (len < 0) |
1272 | goto out; | |
1273 | ||
1274 | ret = -ENAMETOOLONG; | |
1275 | if (len >= PAGE_SIZE) | |
1276 | goto out; | |
1277 | ||
1872981b EP |
1278 | isec = (struct inode_security_struct *)inode->i_security; |
1279 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1280 | if (ret) | |
b77a493b EP |
1281 | goto out; |
1282 | ||
1da177e4 LT |
1283 | isec->sid = sid; |
1284 | isec->initialized = 1; | |
1285 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1286 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1287 | d_add(dentry, inode); |
1288 | } | |
1289 | bool_num = num; | |
d313f948 | 1290 | bool_pending_names = names; |
1da177e4 | 1291 | bool_pending_values = values; |
b77a493b EP |
1292 | |
1293 | free_page((unsigned long)page); | |
1294 | return 0; | |
1da177e4 LT |
1295 | out: |
1296 | free_page((unsigned long)page); | |
b77a493b | 1297 | |
1da177e4 | 1298 | if (names) { |
9a5f04bf JJ |
1299 | for (i = 0; i < num; i++) |
1300 | kfree(names[i]); | |
1da177e4 LT |
1301 | kfree(names); |
1302 | } | |
20c19e41 | 1303 | kfree(values); |
0c92d7c7 | 1304 | sel_remove_entries(dir); |
b77a493b EP |
1305 | |
1306 | return ret; | |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | #define NULL_FILE_NAME "null" | |
1310 | ||
1872981b | 1311 | struct dentry *selinux_null; |
1da177e4 LT |
1312 | |
1313 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1314 | size_t count, loff_t *ppos) | |
1315 | { | |
1316 | char tmpbuf[TMPBUFLEN]; | |
1317 | ssize_t length; | |
1318 | ||
1319 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1320 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1321 | } | |
1322 | ||
1872981b EP |
1323 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1324 | const char __user *buf, | |
1da177e4 LT |
1325 | size_t count, loff_t *ppos) |
1326 | ||
1327 | { | |
b77a493b | 1328 | char *page = NULL; |
1da177e4 LT |
1329 | ssize_t ret; |
1330 | int new_value; | |
1331 | ||
b77a493b EP |
1332 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1333 | if (ret) | |
1da177e4 | 1334 | goto out; |
1da177e4 | 1335 | |
b77a493b EP |
1336 | ret = -ENOMEM; |
1337 | if (count >= PAGE_SIZE) | |
1da177e4 | 1338 | goto out; |
1da177e4 | 1339 | |
b77a493b EP |
1340 | /* No partial writes. */ |
1341 | ret = -EINVAL; | |
1342 | if (*ppos != 0) | |
1343 | goto out; | |
1344 | ||
1345 | ret = -ENOMEM; | |
1872981b | 1346 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1347 | if (!page) |
1da177e4 | 1348 | goto out; |
1da177e4 | 1349 | |
b77a493b EP |
1350 | ret = -EFAULT; |
1351 | if (copy_from_user(page, buf, count)) | |
1352 | goto out; | |
1da177e4 | 1353 | |
b77a493b EP |
1354 | ret = -EINVAL; |
1355 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1356 | goto out; |
1da177e4 | 1357 | |
b77a493b EP |
1358 | avc_cache_threshold = new_value; |
1359 | ||
1da177e4 | 1360 | ret = count; |
1da177e4 | 1361 | out: |
b77a493b | 1362 | free_page((unsigned long)page); |
1da177e4 LT |
1363 | return ret; |
1364 | } | |
1365 | ||
1366 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1367 | size_t count, loff_t *ppos) | |
1368 | { | |
1369 | char *page; | |
b77a493b | 1370 | ssize_t length; |
1da177e4 LT |
1371 | |
1372 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1373 | if (!page) |
1374 | return -ENOMEM; | |
1375 | ||
1376 | length = avc_get_hash_stats(page); | |
1377 | if (length >= 0) | |
1378 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1379 | free_page((unsigned long)page); |
b77a493b EP |
1380 | |
1381 | return length; | |
1da177e4 LT |
1382 | } |
1383 | ||
9c2e08c5 | 1384 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1385 | .read = sel_read_avc_cache_threshold, |
1386 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1387 | .llseek = generic_file_llseek, |
1da177e4 LT |
1388 | }; |
1389 | ||
9c2e08c5 | 1390 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1391 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1392 | .llseek = generic_file_llseek, |
1da177e4 LT |
1393 | }; |
1394 | ||
1395 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1396 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1397 | { | |
1398 | int cpu; | |
1399 | ||
4f4b6c1a | 1400 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1401 | if (!cpu_possible(cpu)) |
1402 | continue; | |
1403 | *idx = cpu + 1; | |
1404 | return &per_cpu(avc_cache_stats, cpu); | |
1405 | } | |
1406 | return NULL; | |
1407 | } | |
1408 | ||
1409 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1410 | { | |
1411 | loff_t n = *pos - 1; | |
1412 | ||
1413 | if (*pos == 0) | |
1414 | return SEQ_START_TOKEN; | |
1415 | ||
1416 | return sel_avc_get_stat_idx(&n); | |
1417 | } | |
1418 | ||
1419 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1420 | { | |
1421 | return sel_avc_get_stat_idx(pos); | |
1422 | } | |
1423 | ||
1424 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1425 | { | |
1426 | struct avc_cache_stats *st = v; | |
1427 | ||
1428 | if (v == SEQ_START_TOKEN) | |
1429 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1430 | "frees\n"); | |
257313b2 LT |
1431 | else { |
1432 | unsigned int lookups = st->lookups; | |
1433 | unsigned int misses = st->misses; | |
1434 | unsigned int hits = lookups - misses; | |
1435 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1436 | hits, misses, st->allocations, | |
1da177e4 | 1437 | st->reclaims, st->frees); |
257313b2 | 1438 | } |
1da177e4 LT |
1439 | return 0; |
1440 | } | |
1441 | ||
1442 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1443 | { } | |
1444 | ||
1996a109 | 1445 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1446 | .start = sel_avc_stats_seq_start, |
1447 | .next = sel_avc_stats_seq_next, | |
1448 | .show = sel_avc_stats_seq_show, | |
1449 | .stop = sel_avc_stats_seq_stop, | |
1450 | }; | |
1451 | ||
1452 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1453 | { | |
1454 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1455 | } | |
1456 | ||
9c2e08c5 | 1457 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1458 | .open = sel_open_avc_cache_stats, |
1459 | .read = seq_read, | |
1460 | .llseek = seq_lseek, | |
1461 | .release = seq_release, | |
1462 | }; | |
1463 | #endif | |
1464 | ||
1465 | static int sel_make_avc_files(struct dentry *dir) | |
1466 | { | |
b77a493b | 1467 | int i; |
1da177e4 LT |
1468 | static struct tree_descr files[] = { |
1469 | { "cache_threshold", | |
1470 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1471 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1472 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1473 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1474 | #endif | |
1475 | }; | |
1476 | ||
6e20a64a | 1477 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1478 | struct inode *inode; |
1479 | struct dentry *dentry; | |
1480 | ||
1481 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1482 | if (!dentry) |
1483 | return -ENOMEM; | |
1da177e4 LT |
1484 | |
1485 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1486 | if (!inode) |
1487 | return -ENOMEM; | |
1488 | ||
1da177e4 | 1489 | inode->i_fop = files[i].ops; |
6174eafc | 1490 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1491 | d_add(dentry, inode); |
1492 | } | |
b77a493b EP |
1493 | |
1494 | return 0; | |
1da177e4 LT |
1495 | } |
1496 | ||
1872981b | 1497 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1498 | size_t count, loff_t *ppos) |
1499 | { | |
1500 | struct inode *inode; | |
1501 | char *con; | |
1502 | u32 sid, len; | |
1503 | ssize_t ret; | |
1504 | ||
1505 | inode = file->f_path.dentry->d_inode; | |
1506 | sid = inode->i_ino&SEL_INO_MASK; | |
1507 | ret = security_sid_to_context(sid, &con, &len); | |
b77a493b | 1508 | if (ret) |
f0ee2e46 JC |
1509 | return ret; |
1510 | ||
1511 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1512 | kfree(con); | |
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | static const struct file_operations sel_initcon_ops = { | |
1517 | .read = sel_read_initcon, | |
57a62c23 | 1518 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1519 | }; |
1520 | ||
1521 | static int sel_make_initcon_files(struct dentry *dir) | |
1522 | { | |
b77a493b | 1523 | int i; |
f0ee2e46 JC |
1524 | |
1525 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1526 | struct inode *inode; | |
1527 | struct dentry *dentry; | |
1528 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1529 | if (!dentry) |
1530 | return -ENOMEM; | |
f0ee2e46 JC |
1531 | |
1532 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1533 | if (!inode) |
1534 | return -ENOMEM; | |
1535 | ||
f0ee2e46 JC |
1536 | inode->i_fop = &sel_initcon_ops; |
1537 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1538 | d_add(dentry, inode); | |
1539 | } | |
b77a493b EP |
1540 | |
1541 | return 0; | |
f0ee2e46 JC |
1542 | } |
1543 | ||
e47c8fc5 CP |
1544 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1545 | { | |
1546 | return a / b - (a % b < 0); | |
1547 | } | |
1548 | ||
1549 | static inline unsigned long sel_class_to_ino(u16 class) | |
1550 | { | |
1551 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1552 | } | |
1553 | ||
1554 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1555 | { | |
1556 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1557 | } | |
1558 | ||
1559 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1560 | { | |
1561 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1562 | } | |
1563 | ||
1564 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1565 | { | |
1566 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1567 | } | |
1568 | ||
1872981b | 1569 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1570 | size_t count, loff_t *ppos) |
1571 | { | |
1572 | ssize_t rc, len; | |
1573 | char *page; | |
1574 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1575 | ||
1576 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1577 | if (!page) |
1578 | return -ENOMEM; | |
e47c8fc5 CP |
1579 | |
1580 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1581 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1582 | free_page((unsigned long)page); | |
b77a493b | 1583 | |
e47c8fc5 CP |
1584 | return rc; |
1585 | } | |
1586 | ||
1587 | static const struct file_operations sel_class_ops = { | |
1588 | .read = sel_read_class, | |
57a62c23 | 1589 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1590 | }; |
1591 | ||
1872981b | 1592 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1593 | size_t count, loff_t *ppos) |
1594 | { | |
1595 | ssize_t rc, len; | |
1596 | char *page; | |
1597 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1598 | ||
1599 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1600 | if (!page) |
1601 | return -ENOMEM; | |
e47c8fc5 | 1602 | |
1872981b | 1603 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); |
e47c8fc5 CP |
1604 | rc = simple_read_from_buffer(buf, count, ppos, page, len); |
1605 | free_page((unsigned long)page); | |
b77a493b | 1606 | |
e47c8fc5 CP |
1607 | return rc; |
1608 | } | |
1609 | ||
1610 | static const struct file_operations sel_perm_ops = { | |
1611 | .read = sel_read_perm, | |
57a62c23 | 1612 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1613 | }; |
1614 | ||
3bb56b25 PM |
1615 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1616 | size_t count, loff_t *ppos) | |
1617 | { | |
1618 | int value; | |
1619 | char tmpbuf[TMPBUFLEN]; | |
1620 | ssize_t length; | |
1621 | unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; | |
1622 | ||
1623 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1624 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1625 | ||
1626 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1627 | } | |
1628 | ||
1629 | static const struct file_operations sel_policycap_ops = { | |
1630 | .read = sel_read_policycap, | |
57a62c23 | 1631 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1632 | }; |
1633 | ||
e47c8fc5 CP |
1634 | static int sel_make_perm_files(char *objclass, int classvalue, |
1635 | struct dentry *dir) | |
1636 | { | |
b77a493b | 1637 | int i, rc, nperms; |
e47c8fc5 CP |
1638 | char **perms; |
1639 | ||
1640 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1641 | if (rc) | |
b77a493b | 1642 | return rc; |
e47c8fc5 CP |
1643 | |
1644 | for (i = 0; i < nperms; i++) { | |
1645 | struct inode *inode; | |
1646 | struct dentry *dentry; | |
1647 | ||
b77a493b | 1648 | rc = -ENOMEM; |
e47c8fc5 | 1649 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1650 | if (!dentry) |
1651 | goto out; | |
e47c8fc5 | 1652 | |
b77a493b | 1653 | rc = -ENOMEM; |
e47c8fc5 | 1654 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1655 | if (!inode) |
1656 | goto out; | |
1657 | ||
e47c8fc5 CP |
1658 | inode->i_fop = &sel_perm_ops; |
1659 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1660 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1661 | d_add(dentry, inode); |
1662 | } | |
b77a493b EP |
1663 | rc = 0; |
1664 | out: | |
e47c8fc5 CP |
1665 | for (i = 0; i < nperms; i++) |
1666 | kfree(perms[i]); | |
1667 | kfree(perms); | |
e47c8fc5 CP |
1668 | return rc; |
1669 | } | |
1670 | ||
1671 | static int sel_make_class_dir_entries(char *classname, int index, | |
1672 | struct dentry *dir) | |
1673 | { | |
1674 | struct dentry *dentry = NULL; | |
1675 | struct inode *inode = NULL; | |
1676 | int rc; | |
1677 | ||
1678 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1679 | if (!dentry) |
1680 | return -ENOMEM; | |
e47c8fc5 CP |
1681 | |
1682 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1683 | if (!inode) |
1684 | return -ENOMEM; | |
e47c8fc5 CP |
1685 | |
1686 | inode->i_fop = &sel_class_ops; | |
1687 | inode->i_ino = sel_class_to_ino(index); | |
1688 | d_add(dentry, inode); | |
1689 | ||
1690 | dentry = d_alloc_name(dir, "perms"); | |
b77a493b EP |
1691 | if (!dentry) |
1692 | return -ENOMEM; | |
e47c8fc5 CP |
1693 | |
1694 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1695 | if (rc) | |
b77a493b | 1696 | return rc; |
e47c8fc5 CP |
1697 | |
1698 | rc = sel_make_perm_files(classname, index, dentry); | |
1699 | ||
e47c8fc5 CP |
1700 | return rc; |
1701 | } | |
1702 | ||
1703 | static void sel_remove_classes(void) | |
1704 | { | |
1705 | struct list_head *class_node; | |
1706 | ||
1707 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1708 | struct dentry *class_subdir = list_entry(class_node, | |
1709 | struct dentry, d_u.d_child); | |
1710 | struct list_head *class_subdir_node; | |
1711 | ||
1712 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1713 | struct dentry *d = list_entry(class_subdir_node, | |
1714 | struct dentry, d_u.d_child); | |
1715 | ||
1716 | if (d->d_inode) | |
1717 | if (d->d_inode->i_mode & S_IFDIR) | |
1718 | sel_remove_entries(d); | |
1719 | } | |
1720 | ||
1721 | sel_remove_entries(class_subdir); | |
1722 | } | |
1723 | ||
1724 | sel_remove_entries(class_dir); | |
1725 | } | |
1726 | ||
1727 | static int sel_make_classes(void) | |
1728 | { | |
b77a493b | 1729 | int rc, nclasses, i; |
e47c8fc5 CP |
1730 | char **classes; |
1731 | ||
1732 | /* delete any existing entries */ | |
1733 | sel_remove_classes(); | |
1734 | ||
1735 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1736 | if (rc) |
1737 | return rc; | |
e47c8fc5 CP |
1738 | |
1739 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1740 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1741 | |
1742 | for (i = 0; i < nclasses; i++) { | |
1743 | struct dentry *class_name_dir; | |
1744 | ||
b77a493b | 1745 | rc = -ENOMEM; |
e47c8fc5 | 1746 | class_name_dir = d_alloc_name(class_dir, classes[i]); |
b77a493b EP |
1747 | if (!class_name_dir) |
1748 | goto out; | |
e47c8fc5 CP |
1749 | |
1750 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1751 | &last_class_ino); | |
1752 | if (rc) | |
b77a493b | 1753 | goto out; |
e47c8fc5 CP |
1754 | |
1755 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1756 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1757 | class_name_dir); |
1758 | if (rc) | |
b77a493b | 1759 | goto out; |
e47c8fc5 | 1760 | } |
b77a493b EP |
1761 | rc = 0; |
1762 | out: | |
e47c8fc5 CP |
1763 | for (i = 0; i < nclasses; i++) |
1764 | kfree(classes[i]); | |
1765 | kfree(classes); | |
e47c8fc5 CP |
1766 | return rc; |
1767 | } | |
1768 | ||
3bb56b25 PM |
1769 | static int sel_make_policycap(void) |
1770 | { | |
1771 | unsigned int iter; | |
1772 | struct dentry *dentry = NULL; | |
1773 | struct inode *inode = NULL; | |
1774 | ||
1775 | sel_remove_entries(policycap_dir); | |
1776 | ||
1777 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1778 | if (iter < ARRAY_SIZE(policycap_names)) | |
1779 | dentry = d_alloc_name(policycap_dir, | |
1780 | policycap_names[iter]); | |
1781 | else | |
1782 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1783 | ||
1784 | if (dentry == NULL) | |
1785 | return -ENOMEM; | |
1786 | ||
1787 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1788 | if (inode == NULL) | |
1789 | return -ENOMEM; | |
1790 | ||
1791 | inode->i_fop = &sel_policycap_ops; | |
1792 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1793 | d_add(dentry, inode); | |
1794 | } | |
1795 | ||
1796 | return 0; | |
1797 | } | |
1798 | ||
0dd4ae51 CP |
1799 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1800 | unsigned long *ino) | |
1da177e4 | 1801 | { |
1da177e4 LT |
1802 | struct inode *inode; |
1803 | ||
edb20fb5 | 1804 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
b77a493b EP |
1805 | if (!inode) |
1806 | return -ENOMEM; | |
1807 | ||
1da177e4 LT |
1808 | inode->i_op = &simple_dir_inode_operations; |
1809 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1810 | inode->i_ino = ++(*ino); |
40e906f8 | 1811 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1812 | inc_nlink(inode); |
1da177e4 | 1813 | d_add(dentry, inode); |
edb20fb5 | 1814 | /* bump link count on parent directory, too */ |
d8c76e6f | 1815 | inc_nlink(dir); |
b77a493b EP |
1816 | |
1817 | return 0; | |
1da177e4 LT |
1818 | } |
1819 | ||
1872981b | 1820 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1821 | { |
1822 | int ret; | |
1823 | struct dentry *dentry; | |
edb20fb5 | 1824 | struct inode *inode, *root_inode; |
1da177e4 LT |
1825 | struct inode_security_struct *isec; |
1826 | ||
1827 | static struct tree_descr selinux_files[] = { | |
1828 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1829 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1830 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1831 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1832 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1833 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1834 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1835 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1836 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1837 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1838 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1839 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1840 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1841 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1842 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1843 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
cee74f47 | 1844 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, |
1da177e4 LT |
1845 | /* last one */ {""} |
1846 | }; | |
1847 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1848 | if (ret) | |
161ce45a | 1849 | goto err; |
1da177e4 | 1850 | |
edb20fb5 JM |
1851 | root_inode = sb->s_root->d_inode; |
1852 | ||
b77a493b | 1853 | ret = -ENOMEM; |
1da177e4 | 1854 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
b77a493b | 1855 | if (!dentry) |
161ce45a | 1856 | goto err; |
1da177e4 | 1857 | |
0dd4ae51 | 1858 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1859 | if (ret) |
161ce45a | 1860 | goto err; |
cde174a8 | 1861 | |
1da177e4 | 1862 | bool_dir = dentry; |
1da177e4 | 1863 | |
b77a493b | 1864 | ret = -ENOMEM; |
1da177e4 | 1865 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1866 | if (!dentry) |
161ce45a | 1867 | goto err; |
1da177e4 | 1868 | |
b77a493b | 1869 | ret = -ENOMEM; |
1da177e4 | 1870 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1871 | if (!inode) |
161ce45a | 1872 | goto err; |
b77a493b | 1873 | |
6174eafc | 1874 | inode->i_ino = ++sel_last_ino; |
1872981b | 1875 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1876 | isec->sid = SECINITSID_DEVNULL; |
1877 | isec->sclass = SECCLASS_CHR_FILE; | |
1878 | isec->initialized = 1; | |
1879 | ||
1880 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1881 | d_add(dentry, inode); | |
1882 | selinux_null = dentry; | |
1883 | ||
b77a493b | 1884 | ret = -ENOMEM; |
1da177e4 | 1885 | dentry = d_alloc_name(sb->s_root, "avc"); |
b77a493b | 1886 | if (!dentry) |
161ce45a | 1887 | goto err; |
1da177e4 | 1888 | |
0dd4ae51 | 1889 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1890 | if (ret) |
161ce45a | 1891 | goto err; |
1da177e4 LT |
1892 | |
1893 | ret = sel_make_avc_files(dentry); | |
1894 | if (ret) | |
161ce45a | 1895 | goto err; |
f0ee2e46 | 1896 | |
b77a493b | 1897 | ret = -ENOMEM; |
f0ee2e46 | 1898 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); |
b77a493b | 1899 | if (!dentry) |
f0ee2e46 | 1900 | goto err; |
f0ee2e46 | 1901 | |
0dd4ae51 | 1902 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1903 | if (ret) |
1904 | goto err; | |
1905 | ||
1906 | ret = sel_make_initcon_files(dentry); | |
1907 | if (ret) | |
1908 | goto err; | |
1909 | ||
b77a493b | 1910 | ret = -ENOMEM; |
e47c8fc5 | 1911 | dentry = d_alloc_name(sb->s_root, "class"); |
b77a493b | 1912 | if (!dentry) |
e47c8fc5 | 1913 | goto err; |
e47c8fc5 CP |
1914 | |
1915 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1916 | if (ret) | |
1917 | goto err; | |
1918 | ||
1919 | class_dir = dentry; | |
1920 | ||
b77a493b | 1921 | ret = -ENOMEM; |
3bb56b25 | 1922 | dentry = d_alloc_name(sb->s_root, "policy_capabilities"); |
b77a493b | 1923 | if (!dentry) |
3bb56b25 | 1924 | goto err; |
3bb56b25 PM |
1925 | |
1926 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1927 | if (ret) | |
1928 | goto err; | |
1929 | ||
1930 | policycap_dir = dentry; | |
1931 | ||
b77a493b | 1932 | return 0; |
161ce45a | 1933 | err: |
744ba35e EP |
1934 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1935 | __func__); | |
b77a493b | 1936 | return ret; |
1da177e4 LT |
1937 | } |
1938 | ||
fc14f2fe AV |
1939 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1940 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1941 | { |
fc14f2fe | 1942 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1943 | } |
1944 | ||
1945 | static struct file_system_type sel_fs_type = { | |
1946 | .name = "selinuxfs", | |
fc14f2fe | 1947 | .mount = sel_mount, |
1da177e4 LT |
1948 | .kill_sb = kill_litter_super, |
1949 | }; | |
1950 | ||
1951 | struct vfsmount *selinuxfs_mount; | |
7a627e3b | 1952 | static struct kobject *selinuxfs_kobj; |
1da177e4 LT |
1953 | |
1954 | static int __init init_sel_fs(void) | |
1955 | { | |
1956 | int err; | |
1957 | ||
1958 | if (!selinux_enabled) | |
1959 | return 0; | |
7a627e3b GKH |
1960 | |
1961 | selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj); | |
1962 | if (!selinuxfs_kobj) | |
1963 | return -ENOMEM; | |
1964 | ||
1da177e4 | 1965 | err = register_filesystem(&sel_fs_type); |
7a627e3b GKH |
1966 | if (err) { |
1967 | kobject_put(selinuxfs_kobj); | |
b77a493b | 1968 | return err; |
7a627e3b | 1969 | } |
b77a493b EP |
1970 | |
1971 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1972 | if (IS_ERR(selinuxfs_mount)) { | |
1973 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1974 | err = PTR_ERR(selinuxfs_mount); | |
1975 | selinuxfs_mount = NULL; | |
1da177e4 | 1976 | } |
b77a493b | 1977 | |
1da177e4 LT |
1978 | return err; |
1979 | } | |
1980 | ||
1981 | __initcall(init_sel_fs); | |
1982 | ||
1983 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1984 | void exit_sel_fs(void) | |
1985 | { | |
7a627e3b | 1986 | kobject_put(selinuxfs_kobj); |
423e0ab0 | 1987 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1988 | unregister_filesystem(&sel_fs_type); |
1989 | } | |
1990 | #endif |