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 | { | |
b77a493b | 144 | char *page = NULL; |
1da177e4 LT |
145 | ssize_t length; |
146 | int new_value; | |
147 | ||
b77a493b | 148 | length = -ENOMEM; |
bfd51626 | 149 | if (count >= PAGE_SIZE) |
b77a493b EP |
150 | goto out; |
151 | ||
152 | /* No partial writes. */ | |
153 | length = EINVAL; | |
154 | if (*ppos != 0) | |
155 | goto out; | |
156 | ||
157 | length = -ENOMEM; | |
1872981b | 158 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 159 | if (!page) |
b77a493b EP |
160 | goto out; |
161 | ||
1da177e4 LT |
162 | length = -EFAULT; |
163 | if (copy_from_user(page, buf, count)) | |
164 | goto out; | |
165 | ||
166 | length = -EINVAL; | |
167 | if (sscanf(page, "%d", &new_value) != 1) | |
168 | goto out; | |
169 | ||
170 | if (new_value != selinux_enforcing) { | |
171 | length = task_has_security(current, SECURITY__SETENFORCE); | |
172 | if (length) | |
173 | goto out; | |
af601e46 | 174 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
175 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
176 | new_value, selinux_enforcing, | |
177 | audit_get_loginuid(current), | |
178 | audit_get_sessionid(current)); | |
1da177e4 LT |
179 | selinux_enforcing = new_value; |
180 | if (selinux_enforcing) | |
181 | avc_ss_reset(0); | |
182 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 183 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
184 | } |
185 | length = count; | |
186 | out: | |
187 | free_page((unsigned long) page); | |
188 | return length; | |
189 | } | |
190 | #else | |
191 | #define sel_write_enforce NULL | |
192 | #endif | |
193 | ||
9c2e08c5 | 194 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
195 | .read = sel_read_enforce, |
196 | .write = sel_write_enforce, | |
57a62c23 | 197 | .llseek = generic_file_llseek, |
1da177e4 LT |
198 | }; |
199 | ||
3f12070e EP |
200 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
201 | size_t count, loff_t *ppos) | |
202 | { | |
203 | char tmpbuf[TMPBUFLEN]; | |
204 | ssize_t length; | |
205 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
206 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? | |
207 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
208 | ||
209 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
210 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
211 | } | |
212 | ||
213 | static const struct file_operations sel_handle_unknown_ops = { | |
214 | .read = sel_read_handle_unknown, | |
57a62c23 | 215 | .llseek = generic_file_llseek, |
3f12070e EP |
216 | }; |
217 | ||
11904167 KK |
218 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
219 | { | |
220 | struct page *status = selinux_kernel_status_page(); | |
221 | ||
222 | if (!status) | |
223 | return -ENOMEM; | |
224 | ||
225 | filp->private_data = status; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
231 | size_t count, loff_t *ppos) | |
232 | { | |
233 | struct page *status = filp->private_data; | |
234 | ||
235 | BUG_ON(!status); | |
236 | ||
237 | return simple_read_from_buffer(buf, count, ppos, | |
238 | page_address(status), | |
239 | sizeof(struct selinux_kernel_status)); | |
240 | } | |
241 | ||
242 | static int sel_mmap_handle_status(struct file *filp, | |
243 | struct vm_area_struct *vma) | |
244 | { | |
245 | struct page *status = filp->private_data; | |
246 | unsigned long size = vma->vm_end - vma->vm_start; | |
247 | ||
248 | BUG_ON(!status); | |
249 | ||
250 | /* only allows one page from the head */ | |
251 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
252 | return -EIO; | |
253 | /* disallow writable mapping */ | |
254 | if (vma->vm_flags & VM_WRITE) | |
255 | return -EPERM; | |
256 | /* disallow mprotect() turns it into writable */ | |
257 | vma->vm_flags &= ~VM_MAYWRITE; | |
258 | ||
259 | return remap_pfn_range(vma, vma->vm_start, | |
260 | page_to_pfn(status), | |
261 | size, vma->vm_page_prot); | |
262 | } | |
263 | ||
264 | static const struct file_operations sel_handle_status_ops = { | |
265 | .open = sel_open_handle_status, | |
266 | .read = sel_read_handle_status, | |
267 | .mmap = sel_mmap_handle_status, | |
268 | .llseek = generic_file_llseek, | |
269 | }; | |
270 | ||
1da177e4 | 271 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 272 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
273 | size_t count, loff_t *ppos) |
274 | ||
275 | { | |
b77a493b | 276 | char *page = NULL; |
1da177e4 LT |
277 | ssize_t length; |
278 | int new_value; | |
279 | extern int selinux_disable(void); | |
280 | ||
b77a493b | 281 | length = -ENOMEM; |
bfd51626 | 282 | if (count >= PAGE_SIZE) |
b77a493b EP |
283 | goto out;; |
284 | ||
285 | /* No partial writes. */ | |
286 | length = -EINVAL; | |
287 | if (*ppos != 0) | |
288 | goto out; | |
289 | ||
290 | length = -ENOMEM; | |
1872981b | 291 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 292 | if (!page) |
b77a493b EP |
293 | goto out; |
294 | ||
1da177e4 LT |
295 | length = -EFAULT; |
296 | if (copy_from_user(page, buf, count)) | |
297 | goto out; | |
298 | ||
299 | length = -EINVAL; | |
300 | if (sscanf(page, "%d", &new_value) != 1) | |
301 | goto out; | |
302 | ||
303 | if (new_value) { | |
304 | length = selinux_disable(); | |
b77a493b | 305 | if (length) |
1da177e4 | 306 | goto out; |
af601e46 | 307 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
308 | "selinux=0 auid=%u ses=%u", |
309 | audit_get_loginuid(current), | |
310 | audit_get_sessionid(current)); | |
1da177e4 LT |
311 | } |
312 | ||
313 | length = count; | |
314 | out: | |
315 | free_page((unsigned long) page); | |
316 | return length; | |
317 | } | |
318 | #else | |
319 | #define sel_write_disable NULL | |
320 | #endif | |
321 | ||
9c2e08c5 | 322 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 323 | .write = sel_write_disable, |
57a62c23 | 324 | .llseek = generic_file_llseek, |
1da177e4 LT |
325 | }; |
326 | ||
327 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 328 | size_t count, loff_t *ppos) |
1da177e4 LT |
329 | { |
330 | char tmpbuf[TMPBUFLEN]; | |
331 | ssize_t length; | |
332 | ||
333 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
334 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
335 | } | |
336 | ||
9c2e08c5 | 337 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 338 | .read = sel_read_policyvers, |
57a62c23 | 339 | .llseek = generic_file_llseek, |
1da177e4 LT |
340 | }; |
341 | ||
342 | /* declaration for sel_write_load */ | |
343 | static int sel_make_bools(void); | |
e47c8fc5 | 344 | static int sel_make_classes(void); |
3bb56b25 | 345 | static int sel_make_policycap(void); |
e47c8fc5 CP |
346 | |
347 | /* declaration for sel_make_class_dirs */ | |
348 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
349 | unsigned long *ino); | |
1da177e4 LT |
350 | |
351 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
352 | size_t count, loff_t *ppos) | |
353 | { | |
354 | char tmpbuf[TMPBUFLEN]; | |
355 | ssize_t length; | |
356 | ||
0719aaf5 GT |
357 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
358 | security_mls_enabled()); | |
1da177e4 LT |
359 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
360 | } | |
361 | ||
9c2e08c5 | 362 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 363 | .read = sel_read_mls, |
57a62c23 | 364 | .llseek = generic_file_llseek, |
1da177e4 LT |
365 | }; |
366 | ||
cee74f47 EP |
367 | struct policy_load_memory { |
368 | size_t len; | |
369 | void *data; | |
370 | }; | |
371 | ||
372 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
373 | { | |
374 | struct policy_load_memory *plm = NULL; | |
375 | int rc; | |
376 | ||
377 | BUG_ON(filp->private_data); | |
378 | ||
379 | mutex_lock(&sel_mutex); | |
380 | ||
381 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
382 | if (rc) | |
383 | goto err; | |
384 | ||
385 | rc = -EBUSY; | |
386 | if (policy_opened) | |
387 | goto err; | |
388 | ||
389 | rc = -ENOMEM; | |
390 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
391 | if (!plm) | |
392 | goto err; | |
393 | ||
394 | if (i_size_read(inode) != security_policydb_len()) { | |
395 | mutex_lock(&inode->i_mutex); | |
396 | i_size_write(inode, security_policydb_len()); | |
397 | mutex_unlock(&inode->i_mutex); | |
398 | } | |
399 | ||
400 | rc = security_read_policy(&plm->data, &plm->len); | |
401 | if (rc) | |
402 | goto err; | |
403 | ||
404 | policy_opened = 1; | |
405 | ||
406 | filp->private_data = plm; | |
407 | ||
408 | mutex_unlock(&sel_mutex); | |
409 | ||
410 | return 0; | |
411 | err: | |
412 | mutex_unlock(&sel_mutex); | |
413 | ||
414 | if (plm) | |
415 | vfree(plm->data); | |
416 | kfree(plm); | |
417 | return rc; | |
418 | } | |
419 | ||
420 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
421 | { | |
422 | struct policy_load_memory *plm = filp->private_data; | |
423 | ||
424 | BUG_ON(!plm); | |
425 | ||
426 | policy_opened = 0; | |
427 | ||
428 | vfree(plm->data); | |
429 | kfree(plm); | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
435 | size_t count, loff_t *ppos) | |
436 | { | |
437 | struct policy_load_memory *plm = filp->private_data; | |
438 | int ret; | |
439 | ||
440 | mutex_lock(&sel_mutex); | |
441 | ||
442 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
443 | if (ret) | |
444 | goto out; | |
445 | ||
446 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
447 | out: | |
448 | mutex_unlock(&sel_mutex); | |
449 | return ret; | |
450 | } | |
451 | ||
845ca30f EP |
452 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
453 | struct vm_fault *vmf) | |
454 | { | |
455 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
456 | unsigned long offset; | |
457 | struct page *page; | |
458 | ||
459 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
460 | return VM_FAULT_SIGBUS; | |
461 | ||
462 | offset = vmf->pgoff << PAGE_SHIFT; | |
463 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
464 | return VM_FAULT_SIGBUS; | |
465 | ||
466 | page = vmalloc_to_page(plm->data + offset); | |
467 | get_page(page); | |
468 | ||
469 | vmf->page = page; | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | static struct vm_operations_struct sel_mmap_policy_ops = { | |
475 | .fault = sel_mmap_policy_fault, | |
476 | .page_mkwrite = sel_mmap_policy_fault, | |
477 | }; | |
478 | ||
479 | int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) | |
480 | { | |
481 | if (vma->vm_flags & VM_SHARED) { | |
482 | /* do not allow mprotect to make mapping writable */ | |
483 | vma->vm_flags &= ~VM_MAYWRITE; | |
484 | ||
485 | if (vma->vm_flags & VM_WRITE) | |
486 | return -EACCES; | |
487 | } | |
488 | ||
489 | vma->vm_flags |= VM_RESERVED; | |
490 | vma->vm_ops = &sel_mmap_policy_ops; | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
cee74f47 EP |
495 | static const struct file_operations sel_policy_ops = { |
496 | .open = sel_open_policy, | |
497 | .read = sel_read_policy, | |
845ca30f | 498 | .mmap = sel_mmap_policy, |
cee74f47 EP |
499 | .release = sel_release_policy, |
500 | }; | |
501 | ||
1872981b | 502 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
503 | size_t count, loff_t *ppos) |
504 | ||
505 | { | |
1da177e4 LT |
506 | ssize_t length; |
507 | void *data = NULL; | |
508 | ||
bb003079 | 509 | mutex_lock(&sel_mutex); |
1da177e4 LT |
510 | |
511 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
512 | if (length) | |
513 | goto out; | |
514 | ||
b77a493b EP |
515 | /* No partial writes. */ |
516 | length = -EINVAL; | |
517 | if (*ppos != 0) | |
1da177e4 | 518 | goto out; |
1da177e4 | 519 | |
b77a493b EP |
520 | length = -EFBIG; |
521 | if (count > 64 * 1024 * 1024) | |
522 | goto out; | |
523 | ||
524 | length = -ENOMEM; | |
525 | data = vmalloc(count); | |
526 | if (!data) | |
1da177e4 | 527 | goto out; |
1da177e4 LT |
528 | |
529 | length = -EFAULT; | |
530 | if (copy_from_user(data, buf, count) != 0) | |
531 | goto out; | |
532 | ||
533 | length = security_load_policy(data, count); | |
534 | if (length) | |
535 | goto out; | |
536 | ||
b77a493b EP |
537 | length = sel_make_bools(); |
538 | if (length) | |
e47c8fc5 | 539 | goto out1; |
e47c8fc5 | 540 | |
b77a493b EP |
541 | length = sel_make_classes(); |
542 | if (length) | |
3bb56b25 | 543 | goto out1; |
3bb56b25 | 544 | |
b77a493b EP |
545 | length = sel_make_policycap(); |
546 | if (length) | |
547 | goto out1; | |
548 | ||
549 | length = count; | |
e47c8fc5 CP |
550 | |
551 | out1: | |
af601e46 | 552 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b EP |
553 | "policy loaded auid=%u ses=%u", |
554 | audit_get_loginuid(current), | |
555 | audit_get_sessionid(current)); | |
1da177e4 | 556 | out: |
bb003079 | 557 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
558 | vfree(data); |
559 | return length; | |
560 | } | |
561 | ||
9c2e08c5 | 562 | static const struct file_operations sel_load_ops = { |
1da177e4 | 563 | .write = sel_write_load, |
57a62c23 | 564 | .llseek = generic_file_llseek, |
1da177e4 LT |
565 | }; |
566 | ||
1872981b | 567 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 568 | { |
b77a493b | 569 | char *canon = NULL; |
ce9982d0 | 570 | u32 sid, len; |
1da177e4 LT |
571 | ssize_t length; |
572 | ||
573 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
574 | if (length) | |
b77a493b | 575 | goto out; |
1da177e4 | 576 | |
ce9982d0 | 577 | length = security_context_to_sid(buf, size, &sid); |
b77a493b EP |
578 | if (length) |
579 | goto out; | |
1da177e4 | 580 | |
ce9982d0 | 581 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
582 | if (length) |
583 | goto out; | |
ce9982d0 | 584 | |
b77a493b | 585 | length = -ERANGE; |
ce9982d0 | 586 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
587 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
588 | "payload max\n", __func__, len); | |
1da177e4 | 589 | goto out; |
ce9982d0 | 590 | } |
1da177e4 | 591 | |
ce9982d0 SS |
592 | memcpy(buf, canon, len); |
593 | length = len; | |
1da177e4 | 594 | out: |
ce9982d0 | 595 | kfree(canon); |
1da177e4 LT |
596 | return length; |
597 | } | |
598 | ||
1da177e4 LT |
599 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
600 | size_t count, loff_t *ppos) | |
601 | { | |
602 | char tmpbuf[TMPBUFLEN]; | |
603 | ssize_t length; | |
604 | ||
605 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
606 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
607 | } | |
608 | ||
1872981b | 609 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
610 | size_t count, loff_t *ppos) |
611 | { | |
b77a493b | 612 | char *page = NULL; |
1da177e4 LT |
613 | ssize_t length; |
614 | unsigned int new_value; | |
615 | ||
616 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
617 | if (length) | |
b77a493b | 618 | goto out; |
1da177e4 | 619 | |
b77a493b | 620 | length = -ENOMEM; |
bfd51626 | 621 | if (count >= PAGE_SIZE) |
b77a493b EP |
622 | goto out; |
623 | ||
624 | /* No partial writes. */ | |
625 | length = -EINVAL; | |
626 | if (*ppos != 0) | |
627 | goto out; | |
628 | ||
629 | length = -ENOMEM; | |
1872981b | 630 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 631 | if (!page) |
b77a493b EP |
632 | goto out; |
633 | ||
1da177e4 LT |
634 | length = -EFAULT; |
635 | if (copy_from_user(page, buf, count)) | |
636 | goto out; | |
637 | ||
638 | length = -EINVAL; | |
639 | if (sscanf(page, "%u", &new_value) != 1) | |
640 | goto out; | |
641 | ||
642 | selinux_checkreqprot = new_value ? 1 : 0; | |
643 | length = count; | |
644 | out: | |
645 | free_page((unsigned long) page); | |
646 | return length; | |
647 | } | |
9c2e08c5 | 648 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
649 | .read = sel_read_checkreqprot, |
650 | .write = sel_write_checkreqprot, | |
57a62c23 | 651 | .llseek = generic_file_llseek, |
1da177e4 LT |
652 | }; |
653 | ||
654 | /* | |
655 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
656 | */ | |
1872981b EP |
657 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
658 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
659 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
660 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
661 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
662 | |
663 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
664 | [SEL_ACCESS] = sel_write_access, | |
665 | [SEL_CREATE] = sel_write_create, | |
666 | [SEL_RELABEL] = sel_write_relabel, | |
667 | [SEL_USER] = sel_write_user, | |
668 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 669 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
670 | }; |
671 | ||
672 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
673 | { | |
1872981b | 674 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
675 | char *data; |
676 | ssize_t rv; | |
677 | ||
6e20a64a | 678 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
679 | return -EINVAL; |
680 | ||
681 | data = simple_transaction_get(file, buf, size); | |
682 | if (IS_ERR(data)) | |
683 | return PTR_ERR(data); | |
684 | ||
1872981b EP |
685 | rv = write_op[ino](file, data, size); |
686 | if (rv > 0) { | |
1da177e4 LT |
687 | simple_transaction_set(file, rv); |
688 | rv = size; | |
689 | } | |
690 | return rv; | |
691 | } | |
692 | ||
9c2e08c5 | 693 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
694 | .write = selinux_transaction_write, |
695 | .read = simple_transaction_read, | |
696 | .release = simple_transaction_release, | |
57a62c23 | 697 | .llseek = generic_file_llseek, |
1da177e4 LT |
698 | }; |
699 | ||
700 | /* | |
701 | * payload - write methods | |
702 | * If the method has a response, the response should be put in buf, | |
703 | * and the length returned. Otherwise return 0 or and -error. | |
704 | */ | |
705 | ||
1872981b | 706 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 707 | { |
b77a493b | 708 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
709 | u32 ssid, tsid; |
710 | u16 tclass; | |
1da177e4 LT |
711 | struct av_decision avd; |
712 | ssize_t length; | |
713 | ||
714 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
715 | if (length) | |
b77a493b | 716 | goto out; |
1da177e4 LT |
717 | |
718 | length = -ENOMEM; | |
c1a7368a | 719 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 720 | if (!scon) |
b77a493b | 721 | goto out; |
1da177e4 | 722 | |
b77a493b | 723 | length = -ENOMEM; |
c1a7368a | 724 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
725 | if (!tcon) |
726 | goto out; | |
1da177e4 LT |
727 | |
728 | length = -EINVAL; | |
19439d05 | 729 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 730 | goto out; |
1da177e4 | 731 | |
c1a7368a | 732 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
733 | if (length) |
734 | goto out; | |
735 | ||
c1a7368a | 736 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
737 | if (length) |
738 | goto out; | |
1da177e4 | 739 | |
19439d05 | 740 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
741 | |
742 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 743 | "%x %x %x %x %u %x", |
f1c6381a | 744 | avd.allowed, 0xffffffff, |
1da177e4 | 745 | avd.auditallow, avd.auditdeny, |
8a6f83af | 746 | avd.seqno, avd.flags); |
1da177e4 | 747 | out: |
b77a493b | 748 | kfree(tcon); |
1da177e4 LT |
749 | kfree(scon); |
750 | return length; | |
751 | } | |
752 | ||
1872981b | 753 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 754 | { |
b77a493b | 755 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 756 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
757 | u32 ssid, tsid, newsid; |
758 | u16 tclass; | |
759 | ssize_t length; | |
b77a493b | 760 | char *newcon = NULL; |
1da177e4 | 761 | u32 len; |
f50a3ec9 | 762 | int nargs; |
1da177e4 LT |
763 | |
764 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
765 | if (length) | |
b77a493b | 766 | goto out; |
1da177e4 LT |
767 | |
768 | length = -ENOMEM; | |
c1a7368a | 769 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 770 | if (!scon) |
b77a493b | 771 | goto out; |
1da177e4 | 772 | |
b77a493b | 773 | length = -ENOMEM; |
c1a7368a | 774 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
775 | if (!tcon) |
776 | goto out; | |
1da177e4 | 777 | |
f50a3ec9 KK |
778 | length = -ENOMEM; |
779 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
780 | if (!namebuf) | |
781 | goto out; | |
782 | ||
1da177e4 | 783 | length = -EINVAL; |
f50a3ec9 KK |
784 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
785 | if (nargs < 3 || nargs > 4) | |
b77a493b | 786 | goto out; |
f50a3ec9 KK |
787 | if (nargs == 4) |
788 | objname = namebuf; | |
1da177e4 | 789 | |
c1a7368a | 790 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
791 | if (length) |
792 | goto out; | |
793 | ||
c1a7368a | 794 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
795 | if (length) |
796 | goto out; | |
1da177e4 | 797 | |
f50a3ec9 KK |
798 | length = security_transition_sid_user(ssid, tsid, tclass, |
799 | objname, &newsid); | |
b77a493b EP |
800 | if (length) |
801 | goto out; | |
1da177e4 LT |
802 | |
803 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
804 | if (length) |
805 | goto out; | |
1da177e4 | 806 | |
b77a493b | 807 | length = -ERANGE; |
1da177e4 | 808 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
809 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
810 | "payload max\n", __func__, len); | |
b77a493b | 811 | goto out; |
1da177e4 LT |
812 | } |
813 | ||
814 | memcpy(buf, newcon, len); | |
815 | length = len; | |
b77a493b | 816 | out: |
1da177e4 | 817 | kfree(newcon); |
f50a3ec9 | 818 | kfree(namebuf); |
1da177e4 | 819 | kfree(tcon); |
1da177e4 LT |
820 | kfree(scon); |
821 | return length; | |
822 | } | |
823 | ||
1872981b | 824 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 825 | { |
b77a493b | 826 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
827 | u32 ssid, tsid, newsid; |
828 | u16 tclass; | |
829 | ssize_t length; | |
b77a493b | 830 | char *newcon = NULL; |
1da177e4 LT |
831 | u32 len; |
832 | ||
833 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
834 | if (length) | |
b77a493b | 835 | goto out; |
1da177e4 LT |
836 | |
837 | length = -ENOMEM; | |
c1a7368a | 838 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 839 | if (!scon) |
b77a493b | 840 | goto out; |
1da177e4 | 841 | |
b77a493b | 842 | length = -ENOMEM; |
c1a7368a | 843 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
844 | if (!tcon) |
845 | goto out; | |
1da177e4 LT |
846 | |
847 | length = -EINVAL; | |
848 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 849 | goto out; |
1da177e4 | 850 | |
c1a7368a | 851 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
852 | if (length) |
853 | goto out; | |
854 | ||
c1a7368a | 855 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
856 | if (length) |
857 | goto out; | |
1da177e4 LT |
858 | |
859 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
860 | if (length) |
861 | goto out; | |
1da177e4 LT |
862 | |
863 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
864 | if (length) |
865 | goto out; | |
1da177e4 | 866 | |
b77a493b EP |
867 | length = -ERANGE; |
868 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
869 | goto out; | |
1da177e4 LT |
870 | |
871 | memcpy(buf, newcon, len); | |
872 | length = len; | |
b77a493b | 873 | out: |
1da177e4 | 874 | kfree(newcon); |
1da177e4 | 875 | kfree(tcon); |
1da177e4 LT |
876 | kfree(scon); |
877 | return length; | |
878 | } | |
879 | ||
1872981b | 880 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 881 | { |
b77a493b EP |
882 | char *con = NULL, *user = NULL, *ptr; |
883 | u32 sid, *sids = NULL; | |
1da177e4 LT |
884 | ssize_t length; |
885 | char *newcon; | |
886 | int i, rc; | |
887 | u32 len, nsids; | |
888 | ||
889 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
890 | if (length) | |
b77a493b | 891 | goto out;; |
1da177e4 LT |
892 | |
893 | length = -ENOMEM; | |
c1a7368a | 894 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 895 | if (!con) |
b77a493b | 896 | goto out;; |
1da177e4 | 897 | |
b77a493b | 898 | length = -ENOMEM; |
c1a7368a | 899 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
900 | if (!user) |
901 | goto out; | |
1da177e4 LT |
902 | |
903 | length = -EINVAL; | |
904 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 905 | goto out; |
1da177e4 | 906 | |
c1a7368a | 907 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
b77a493b EP |
908 | if (length) |
909 | goto out; | |
1da177e4 LT |
910 | |
911 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
912 | if (length) |
913 | goto out; | |
1da177e4 LT |
914 | |
915 | length = sprintf(buf, "%u", nsids) + 1; | |
916 | ptr = buf + length; | |
917 | for (i = 0; i < nsids; i++) { | |
918 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
919 | if (rc) { | |
920 | length = rc; | |
b77a493b | 921 | goto out; |
1da177e4 LT |
922 | } |
923 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
924 | kfree(newcon); | |
925 | length = -ERANGE; | |
b77a493b | 926 | goto out; |
1da177e4 LT |
927 | } |
928 | memcpy(ptr, newcon, len); | |
929 | kfree(newcon); | |
930 | ptr += len; | |
931 | length += len; | |
932 | } | |
b77a493b | 933 | out: |
1da177e4 | 934 | kfree(sids); |
1da177e4 | 935 | kfree(user); |
1da177e4 LT |
936 | kfree(con); |
937 | return length; | |
938 | } | |
939 | ||
1872981b | 940 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 941 | { |
b77a493b | 942 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
943 | u32 ssid, tsid, newsid; |
944 | u16 tclass; | |
945 | ssize_t length; | |
b77a493b | 946 | char *newcon = NULL; |
1da177e4 LT |
947 | u32 len; |
948 | ||
949 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
950 | if (length) | |
b77a493b | 951 | goto out; |
1da177e4 LT |
952 | |
953 | length = -ENOMEM; | |
c1a7368a | 954 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 955 | if (!scon) |
b77a493b | 956 | goto out;; |
1da177e4 | 957 | |
b77a493b | 958 | length = -ENOMEM; |
c1a7368a | 959 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
960 | if (!tcon) |
961 | goto out; | |
1da177e4 LT |
962 | |
963 | length = -EINVAL; | |
964 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 965 | goto out; |
1da177e4 | 966 | |
c1a7368a | 967 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
968 | if (length) |
969 | goto out; | |
970 | ||
c1a7368a | 971 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
972 | if (length) |
973 | goto out; | |
1da177e4 LT |
974 | |
975 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
976 | if (length) |
977 | goto out; | |
1da177e4 LT |
978 | |
979 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
980 | if (length) |
981 | goto out; | |
1da177e4 | 982 | |
b77a493b | 983 | length = -ERANGE; |
1da177e4 | 984 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
985 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
986 | "payload max\n", __func__, len); | |
b77a493b | 987 | goto out; |
1da177e4 LT |
988 | } |
989 | ||
990 | memcpy(buf, newcon, len); | |
991 | length = len; | |
b77a493b | 992 | out: |
1da177e4 | 993 | kfree(newcon); |
1da177e4 | 994 | kfree(tcon); |
1da177e4 LT |
995 | kfree(scon); |
996 | return length; | |
997 | } | |
998 | ||
999 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1000 | { | |
1001 | struct inode *ret = new_inode(sb); | |
1002 | ||
1003 | if (ret) { | |
1004 | ret->i_mode = mode; | |
1da177e4 LT |
1005 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1006 | } | |
1007 | return ret; | |
1008 | } | |
1009 | ||
1da177e4 LT |
1010 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1011 | size_t count, loff_t *ppos) | |
1012 | { | |
1013 | char *page = NULL; | |
1014 | ssize_t length; | |
1da177e4 LT |
1015 | ssize_t ret; |
1016 | int cur_enforcing; | |
d313f948 SS |
1017 | struct inode *inode = filep->f_path.dentry->d_inode; |
1018 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1019 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1020 | |
bb003079 | 1021 | mutex_lock(&sel_mutex); |
1da177e4 | 1022 | |
b77a493b EP |
1023 | ret = -EINVAL; |
1024 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1025 | goto out; |
1da177e4 | 1026 | |
b77a493b | 1027 | ret = -ENOMEM; |
1872981b | 1028 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1029 | if (!page) |
1da177e4 | 1030 | goto out; |
1da177e4 | 1031 | |
d313f948 | 1032 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1033 | if (cur_enforcing < 0) { |
1034 | ret = cur_enforcing; | |
1035 | goto out; | |
1036 | } | |
1da177e4 | 1037 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1038 | bool_pending_values[index]); |
68bdcf28 | 1039 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1040 | out: |
bb003079 | 1041 | mutex_unlock(&sel_mutex); |
b77a493b | 1042 | free_page((unsigned long)page); |
1da177e4 LT |
1043 | return ret; |
1044 | } | |
1045 | ||
1046 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1047 | size_t count, loff_t *ppos) | |
1048 | { | |
1049 | char *page = NULL; | |
d313f948 | 1050 | ssize_t length; |
1da177e4 | 1051 | int new_value; |
d313f948 SS |
1052 | struct inode *inode = filep->f_path.dentry->d_inode; |
1053 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1054 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1055 | |
bb003079 | 1056 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1057 | |
1058 | length = task_has_security(current, SECURITY__SETBOOL); | |
1059 | if (length) | |
1060 | goto out; | |
1061 | ||
b77a493b EP |
1062 | length = -EINVAL; |
1063 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1064 | goto out; |
d313f948 | 1065 | |
b77a493b EP |
1066 | length = -ENOMEM; |
1067 | if (count >= PAGE_SIZE) | |
1da177e4 | 1068 | goto out; |
d313f948 | 1069 | |
b77a493b EP |
1070 | /* No partial writes. */ |
1071 | length = -EINVAL; | |
1072 | if (*ppos != 0) | |
1da177e4 | 1073 | goto out; |
b77a493b EP |
1074 | |
1075 | length = -ENOMEM; | |
1872981b | 1076 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1077 | if (!page) |
1da177e4 | 1078 | goto out; |
1da177e4 | 1079 | |
d313f948 | 1080 | length = -EFAULT; |
1da177e4 LT |
1081 | if (copy_from_user(page, buf, count)) |
1082 | goto out; | |
1083 | ||
1084 | length = -EINVAL; | |
1085 | if (sscanf(page, "%d", &new_value) != 1) | |
1086 | goto out; | |
1087 | ||
1088 | if (new_value) | |
1089 | new_value = 1; | |
1090 | ||
d313f948 | 1091 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1092 | length = count; |
1093 | ||
1094 | out: | |
bb003079 | 1095 | mutex_unlock(&sel_mutex); |
b77a493b | 1096 | free_page((unsigned long) page); |
1da177e4 LT |
1097 | return length; |
1098 | } | |
1099 | ||
9c2e08c5 | 1100 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1101 | .read = sel_read_bool, |
1102 | .write = sel_write_bool, | |
57a62c23 | 1103 | .llseek = generic_file_llseek, |
1da177e4 LT |
1104 | }; |
1105 | ||
1106 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1107 | const char __user *buf, | |
1108 | size_t count, loff_t *ppos) | |
1109 | { | |
1110 | char *page = NULL; | |
d313f948 | 1111 | ssize_t length; |
1da177e4 LT |
1112 | int new_value; |
1113 | ||
bb003079 | 1114 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1115 | |
1116 | length = task_has_security(current, SECURITY__SETBOOL); | |
1117 | if (length) | |
1118 | goto out; | |
1119 | ||
b77a493b EP |
1120 | length = -ENOMEM; |
1121 | if (count >= PAGE_SIZE) | |
1da177e4 | 1122 | goto out; |
b77a493b EP |
1123 | |
1124 | /* No partial writes. */ | |
1125 | length = -EINVAL; | |
1126 | if (*ppos != 0) | |
1da177e4 | 1127 | goto out; |
b77a493b EP |
1128 | |
1129 | length = -ENOMEM; | |
1872981b | 1130 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1131 | if (!page) |
1da177e4 | 1132 | goto out; |
1da177e4 | 1133 | |
d313f948 | 1134 | length = -EFAULT; |
1da177e4 LT |
1135 | if (copy_from_user(page, buf, count)) |
1136 | goto out; | |
1137 | ||
1138 | length = -EINVAL; | |
1139 | if (sscanf(page, "%d", &new_value) != 1) | |
1140 | goto out; | |
1141 | ||
b77a493b | 1142 | length = 0; |
1872981b | 1143 | if (new_value && bool_pending_values) |
b77a493b | 1144 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1145 | |
b77a493b EP |
1146 | if (!length) |
1147 | length = count; | |
1da177e4 LT |
1148 | |
1149 | out: | |
bb003079 | 1150 | mutex_unlock(&sel_mutex); |
b77a493b | 1151 | free_page((unsigned long) page); |
1da177e4 LT |
1152 | return length; |
1153 | } | |
1154 | ||
9c2e08c5 | 1155 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1156 | .write = sel_commit_bools_write, |
57a62c23 | 1157 | .llseek = generic_file_llseek, |
1da177e4 LT |
1158 | }; |
1159 | ||
0c92d7c7 | 1160 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1161 | { |
0955dc03 | 1162 | struct list_head *node; |
1da177e4 | 1163 | |
2fd6b7f5 | 1164 | spin_lock(&de->d_lock); |
1da177e4 LT |
1165 | node = de->d_subdirs.next; |
1166 | while (node != &de->d_subdirs) { | |
5160ee6f | 1167 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1168 | |
1169 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1170 | list_del_init(node); |
1171 | ||
1172 | if (d->d_inode) { | |
dc0474be | 1173 | dget_dlock(d); |
2fd6b7f5 NP |
1174 | spin_unlock(&de->d_lock); |
1175 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1176 | d_delete(d); |
1177 | simple_unlink(de->d_inode, d); | |
1178 | dput(d); | |
2fd6b7f5 NP |
1179 | spin_lock(&de->d_lock); |
1180 | } else | |
1181 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1182 | node = de->d_subdirs.next; |
1183 | } | |
1184 | ||
2fd6b7f5 | 1185 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1186 | } |
1187 | ||
1188 | #define BOOL_DIR_NAME "booleans" | |
1189 | ||
1190 | static int sel_make_bools(void) | |
1191 | { | |
b77a493b | 1192 | int i, ret; |
1da177e4 LT |
1193 | ssize_t len; |
1194 | struct dentry *dentry = NULL; | |
1195 | struct dentry *dir = bool_dir; | |
1196 | struct inode *inode = NULL; | |
1197 | struct inode_security_struct *isec; | |
1198 | char **names = NULL, *page; | |
1199 | int num; | |
1200 | int *values = NULL; | |
1201 | u32 sid; | |
1202 | ||
1203 | /* remove any existing files */ | |
8007f102 XF |
1204 | for (i = 0; i < bool_num; i++) |
1205 | kfree(bool_pending_names[i]); | |
d313f948 | 1206 | kfree(bool_pending_names); |
9a5f04bf | 1207 | kfree(bool_pending_values); |
d313f948 | 1208 | bool_pending_names = NULL; |
20c19e41 | 1209 | bool_pending_values = NULL; |
1da177e4 | 1210 | |
0c92d7c7 | 1211 | sel_remove_entries(dir); |
1da177e4 | 1212 | |
b77a493b | 1213 | ret = -ENOMEM; |
1872981b EP |
1214 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1215 | if (!page) | |
b77a493b | 1216 | goto out; |
1da177e4 LT |
1217 | |
1218 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1219 | if (ret) |
1da177e4 LT |
1220 | goto out; |
1221 | ||
1222 | for (i = 0; i < num; i++) { | |
b77a493b | 1223 | ret = -ENOMEM; |
1da177e4 | 1224 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1225 | if (!dentry) |
1226 | goto out; | |
1227 | ||
1228 | ret = -ENOMEM; | |
1da177e4 | 1229 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1230 | if (!inode) |
1231 | goto out; | |
1da177e4 | 1232 | |
b77a493b | 1233 | ret = -EINVAL; |
1da177e4 | 1234 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1235 | if (len < 0) |
1236 | goto out; | |
1237 | ||
1238 | ret = -ENAMETOOLONG; | |
1239 | if (len >= PAGE_SIZE) | |
1240 | goto out; | |
1241 | ||
1872981b EP |
1242 | isec = (struct inode_security_struct *)inode->i_security; |
1243 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1244 | if (ret) | |
b77a493b EP |
1245 | goto out; |
1246 | ||
1da177e4 LT |
1247 | isec->sid = sid; |
1248 | isec->initialized = 1; | |
1249 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1250 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1251 | d_add(dentry, inode); |
1252 | } | |
1253 | bool_num = num; | |
d313f948 | 1254 | bool_pending_names = names; |
1da177e4 | 1255 | bool_pending_values = values; |
b77a493b EP |
1256 | |
1257 | free_page((unsigned long)page); | |
1258 | return 0; | |
1da177e4 LT |
1259 | out: |
1260 | free_page((unsigned long)page); | |
b77a493b | 1261 | |
1da177e4 | 1262 | if (names) { |
9a5f04bf JJ |
1263 | for (i = 0; i < num; i++) |
1264 | kfree(names[i]); | |
1da177e4 LT |
1265 | kfree(names); |
1266 | } | |
20c19e41 | 1267 | kfree(values); |
0c92d7c7 | 1268 | sel_remove_entries(dir); |
b77a493b EP |
1269 | |
1270 | return ret; | |
1da177e4 LT |
1271 | } |
1272 | ||
1273 | #define NULL_FILE_NAME "null" | |
1274 | ||
1872981b | 1275 | struct dentry *selinux_null; |
1da177e4 LT |
1276 | |
1277 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1278 | size_t count, loff_t *ppos) | |
1279 | { | |
1280 | char tmpbuf[TMPBUFLEN]; | |
1281 | ssize_t length; | |
1282 | ||
1283 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1284 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1285 | } | |
1286 | ||
1872981b EP |
1287 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1288 | const char __user *buf, | |
1da177e4 LT |
1289 | size_t count, loff_t *ppos) |
1290 | ||
1291 | { | |
b77a493b | 1292 | char *page = NULL; |
1da177e4 LT |
1293 | ssize_t ret; |
1294 | int new_value; | |
1295 | ||
b77a493b EP |
1296 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1297 | if (ret) | |
1da177e4 | 1298 | goto out; |
1da177e4 | 1299 | |
b77a493b EP |
1300 | ret = -ENOMEM; |
1301 | if (count >= PAGE_SIZE) | |
1da177e4 | 1302 | goto out; |
1da177e4 | 1303 | |
b77a493b EP |
1304 | /* No partial writes. */ |
1305 | ret = -EINVAL; | |
1306 | if (*ppos != 0) | |
1307 | goto out; | |
1308 | ||
1309 | ret = -ENOMEM; | |
1872981b | 1310 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1311 | if (!page) |
1da177e4 | 1312 | goto out; |
1da177e4 | 1313 | |
b77a493b EP |
1314 | ret = -EFAULT; |
1315 | if (copy_from_user(page, buf, count)) | |
1316 | goto out; | |
1da177e4 | 1317 | |
b77a493b EP |
1318 | ret = -EINVAL; |
1319 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1320 | goto out; |
1da177e4 | 1321 | |
b77a493b EP |
1322 | avc_cache_threshold = new_value; |
1323 | ||
1da177e4 | 1324 | ret = count; |
1da177e4 | 1325 | out: |
b77a493b | 1326 | free_page((unsigned long)page); |
1da177e4 LT |
1327 | return ret; |
1328 | } | |
1329 | ||
1330 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1331 | size_t count, loff_t *ppos) | |
1332 | { | |
1333 | char *page; | |
b77a493b | 1334 | ssize_t length; |
1da177e4 LT |
1335 | |
1336 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1337 | if (!page) |
1338 | return -ENOMEM; | |
1339 | ||
1340 | length = avc_get_hash_stats(page); | |
1341 | if (length >= 0) | |
1342 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1343 | free_page((unsigned long)page); |
b77a493b EP |
1344 | |
1345 | return length; | |
1da177e4 LT |
1346 | } |
1347 | ||
9c2e08c5 | 1348 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1349 | .read = sel_read_avc_cache_threshold, |
1350 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1351 | .llseek = generic_file_llseek, |
1da177e4 LT |
1352 | }; |
1353 | ||
9c2e08c5 | 1354 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1355 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1356 | .llseek = generic_file_llseek, |
1da177e4 LT |
1357 | }; |
1358 | ||
1359 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1360 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1361 | { | |
1362 | int cpu; | |
1363 | ||
4f4b6c1a | 1364 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1365 | if (!cpu_possible(cpu)) |
1366 | continue; | |
1367 | *idx = cpu + 1; | |
1368 | return &per_cpu(avc_cache_stats, cpu); | |
1369 | } | |
1370 | return NULL; | |
1371 | } | |
1372 | ||
1373 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1374 | { | |
1375 | loff_t n = *pos - 1; | |
1376 | ||
1377 | if (*pos == 0) | |
1378 | return SEQ_START_TOKEN; | |
1379 | ||
1380 | return sel_avc_get_stat_idx(&n); | |
1381 | } | |
1382 | ||
1383 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1384 | { | |
1385 | return sel_avc_get_stat_idx(pos); | |
1386 | } | |
1387 | ||
1388 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1389 | { | |
1390 | struct avc_cache_stats *st = v; | |
1391 | ||
1392 | if (v == SEQ_START_TOKEN) | |
1393 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1394 | "frees\n"); | |
1395 | else | |
1396 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1397 | st->hits, st->misses, st->allocations, | |
1398 | st->reclaims, st->frees); | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1403 | { } | |
1404 | ||
1996a109 | 1405 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1406 | .start = sel_avc_stats_seq_start, |
1407 | .next = sel_avc_stats_seq_next, | |
1408 | .show = sel_avc_stats_seq_show, | |
1409 | .stop = sel_avc_stats_seq_stop, | |
1410 | }; | |
1411 | ||
1412 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1413 | { | |
1414 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1415 | } | |
1416 | ||
9c2e08c5 | 1417 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1418 | .open = sel_open_avc_cache_stats, |
1419 | .read = seq_read, | |
1420 | .llseek = seq_lseek, | |
1421 | .release = seq_release, | |
1422 | }; | |
1423 | #endif | |
1424 | ||
1425 | static int sel_make_avc_files(struct dentry *dir) | |
1426 | { | |
b77a493b | 1427 | int i; |
1da177e4 LT |
1428 | static struct tree_descr files[] = { |
1429 | { "cache_threshold", | |
1430 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1431 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1432 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1433 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1434 | #endif | |
1435 | }; | |
1436 | ||
6e20a64a | 1437 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1438 | struct inode *inode; |
1439 | struct dentry *dentry; | |
1440 | ||
1441 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1442 | if (!dentry) |
1443 | return -ENOMEM; | |
1da177e4 LT |
1444 | |
1445 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1446 | if (!inode) |
1447 | return -ENOMEM; | |
1448 | ||
1da177e4 | 1449 | inode->i_fop = files[i].ops; |
6174eafc | 1450 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1451 | d_add(dentry, inode); |
1452 | } | |
b77a493b EP |
1453 | |
1454 | return 0; | |
1da177e4 LT |
1455 | } |
1456 | ||
1872981b | 1457 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1458 | size_t count, loff_t *ppos) |
1459 | { | |
1460 | struct inode *inode; | |
1461 | char *con; | |
1462 | u32 sid, len; | |
1463 | ssize_t ret; | |
1464 | ||
1465 | inode = file->f_path.dentry->d_inode; | |
1466 | sid = inode->i_ino&SEL_INO_MASK; | |
1467 | ret = security_sid_to_context(sid, &con, &len); | |
b77a493b | 1468 | if (ret) |
f0ee2e46 JC |
1469 | return ret; |
1470 | ||
1471 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1472 | kfree(con); | |
1473 | return ret; | |
1474 | } | |
1475 | ||
1476 | static const struct file_operations sel_initcon_ops = { | |
1477 | .read = sel_read_initcon, | |
57a62c23 | 1478 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1479 | }; |
1480 | ||
1481 | static int sel_make_initcon_files(struct dentry *dir) | |
1482 | { | |
b77a493b | 1483 | int i; |
f0ee2e46 JC |
1484 | |
1485 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1486 | struct inode *inode; | |
1487 | struct dentry *dentry; | |
1488 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1489 | if (!dentry) |
1490 | return -ENOMEM; | |
f0ee2e46 JC |
1491 | |
1492 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1493 | if (!inode) |
1494 | return -ENOMEM; | |
1495 | ||
f0ee2e46 JC |
1496 | inode->i_fop = &sel_initcon_ops; |
1497 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1498 | d_add(dentry, inode); | |
1499 | } | |
b77a493b EP |
1500 | |
1501 | return 0; | |
f0ee2e46 JC |
1502 | } |
1503 | ||
e47c8fc5 CP |
1504 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1505 | { | |
1506 | return a / b - (a % b < 0); | |
1507 | } | |
1508 | ||
1509 | static inline unsigned long sel_class_to_ino(u16 class) | |
1510 | { | |
1511 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1512 | } | |
1513 | ||
1514 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1515 | { | |
1516 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1517 | } | |
1518 | ||
1519 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1520 | { | |
1521 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1522 | } | |
1523 | ||
1524 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1525 | { | |
1526 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1527 | } | |
1528 | ||
1872981b | 1529 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1530 | size_t count, loff_t *ppos) |
1531 | { | |
1532 | ssize_t rc, len; | |
1533 | char *page; | |
1534 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1535 | ||
1536 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1537 | if (!page) |
1538 | return -ENOMEM; | |
e47c8fc5 CP |
1539 | |
1540 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1541 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1542 | free_page((unsigned long)page); | |
b77a493b | 1543 | |
e47c8fc5 CP |
1544 | return rc; |
1545 | } | |
1546 | ||
1547 | static const struct file_operations sel_class_ops = { | |
1548 | .read = sel_read_class, | |
57a62c23 | 1549 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1550 | }; |
1551 | ||
1872981b | 1552 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1553 | size_t count, loff_t *ppos) |
1554 | { | |
1555 | ssize_t rc, len; | |
1556 | char *page; | |
1557 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1558 | ||
1559 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1560 | if (!page) |
1561 | return -ENOMEM; | |
e47c8fc5 | 1562 | |
1872981b | 1563 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); |
e47c8fc5 CP |
1564 | rc = simple_read_from_buffer(buf, count, ppos, page, len); |
1565 | free_page((unsigned long)page); | |
b77a493b | 1566 | |
e47c8fc5 CP |
1567 | return rc; |
1568 | } | |
1569 | ||
1570 | static const struct file_operations sel_perm_ops = { | |
1571 | .read = sel_read_perm, | |
57a62c23 | 1572 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1573 | }; |
1574 | ||
3bb56b25 PM |
1575 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1576 | size_t count, loff_t *ppos) | |
1577 | { | |
1578 | int value; | |
1579 | char tmpbuf[TMPBUFLEN]; | |
1580 | ssize_t length; | |
1581 | unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; | |
1582 | ||
1583 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1584 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1585 | ||
1586 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1587 | } | |
1588 | ||
1589 | static const struct file_operations sel_policycap_ops = { | |
1590 | .read = sel_read_policycap, | |
57a62c23 | 1591 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1592 | }; |
1593 | ||
e47c8fc5 CP |
1594 | static int sel_make_perm_files(char *objclass, int classvalue, |
1595 | struct dentry *dir) | |
1596 | { | |
b77a493b | 1597 | int i, rc, nperms; |
e47c8fc5 CP |
1598 | char **perms; |
1599 | ||
1600 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1601 | if (rc) | |
b77a493b | 1602 | return rc; |
e47c8fc5 CP |
1603 | |
1604 | for (i = 0; i < nperms; i++) { | |
1605 | struct inode *inode; | |
1606 | struct dentry *dentry; | |
1607 | ||
b77a493b | 1608 | rc = -ENOMEM; |
e47c8fc5 | 1609 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1610 | if (!dentry) |
1611 | goto out; | |
e47c8fc5 | 1612 | |
b77a493b | 1613 | rc = -ENOMEM; |
e47c8fc5 | 1614 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1615 | if (!inode) |
1616 | goto out; | |
1617 | ||
e47c8fc5 CP |
1618 | inode->i_fop = &sel_perm_ops; |
1619 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1620 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1621 | d_add(dentry, inode); |
1622 | } | |
b77a493b EP |
1623 | rc = 0; |
1624 | out: | |
e47c8fc5 CP |
1625 | for (i = 0; i < nperms; i++) |
1626 | kfree(perms[i]); | |
1627 | kfree(perms); | |
e47c8fc5 CP |
1628 | return rc; |
1629 | } | |
1630 | ||
1631 | static int sel_make_class_dir_entries(char *classname, int index, | |
1632 | struct dentry *dir) | |
1633 | { | |
1634 | struct dentry *dentry = NULL; | |
1635 | struct inode *inode = NULL; | |
1636 | int rc; | |
1637 | ||
1638 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1639 | if (!dentry) |
1640 | return -ENOMEM; | |
e47c8fc5 CP |
1641 | |
1642 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1643 | if (!inode) |
1644 | return -ENOMEM; | |
e47c8fc5 CP |
1645 | |
1646 | inode->i_fop = &sel_class_ops; | |
1647 | inode->i_ino = sel_class_to_ino(index); | |
1648 | d_add(dentry, inode); | |
1649 | ||
1650 | dentry = d_alloc_name(dir, "perms"); | |
b77a493b EP |
1651 | if (!dentry) |
1652 | return -ENOMEM; | |
e47c8fc5 CP |
1653 | |
1654 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1655 | if (rc) | |
b77a493b | 1656 | return rc; |
e47c8fc5 CP |
1657 | |
1658 | rc = sel_make_perm_files(classname, index, dentry); | |
1659 | ||
e47c8fc5 CP |
1660 | return rc; |
1661 | } | |
1662 | ||
1663 | static void sel_remove_classes(void) | |
1664 | { | |
1665 | struct list_head *class_node; | |
1666 | ||
1667 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1668 | struct dentry *class_subdir = list_entry(class_node, | |
1669 | struct dentry, d_u.d_child); | |
1670 | struct list_head *class_subdir_node; | |
1671 | ||
1672 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1673 | struct dentry *d = list_entry(class_subdir_node, | |
1674 | struct dentry, d_u.d_child); | |
1675 | ||
1676 | if (d->d_inode) | |
1677 | if (d->d_inode->i_mode & S_IFDIR) | |
1678 | sel_remove_entries(d); | |
1679 | } | |
1680 | ||
1681 | sel_remove_entries(class_subdir); | |
1682 | } | |
1683 | ||
1684 | sel_remove_entries(class_dir); | |
1685 | } | |
1686 | ||
1687 | static int sel_make_classes(void) | |
1688 | { | |
b77a493b | 1689 | int rc, nclasses, i; |
e47c8fc5 CP |
1690 | char **classes; |
1691 | ||
1692 | /* delete any existing entries */ | |
1693 | sel_remove_classes(); | |
1694 | ||
1695 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1696 | if (rc) |
1697 | return rc; | |
e47c8fc5 CP |
1698 | |
1699 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1700 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1701 | |
1702 | for (i = 0; i < nclasses; i++) { | |
1703 | struct dentry *class_name_dir; | |
1704 | ||
b77a493b | 1705 | rc = -ENOMEM; |
e47c8fc5 | 1706 | class_name_dir = d_alloc_name(class_dir, classes[i]); |
b77a493b EP |
1707 | if (!class_name_dir) |
1708 | goto out; | |
e47c8fc5 CP |
1709 | |
1710 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1711 | &last_class_ino); | |
1712 | if (rc) | |
b77a493b | 1713 | goto out; |
e47c8fc5 CP |
1714 | |
1715 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1716 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1717 | class_name_dir); |
1718 | if (rc) | |
b77a493b | 1719 | goto out; |
e47c8fc5 | 1720 | } |
b77a493b EP |
1721 | rc = 0; |
1722 | out: | |
e47c8fc5 CP |
1723 | for (i = 0; i < nclasses; i++) |
1724 | kfree(classes[i]); | |
1725 | kfree(classes); | |
e47c8fc5 CP |
1726 | return rc; |
1727 | } | |
1728 | ||
3bb56b25 PM |
1729 | static int sel_make_policycap(void) |
1730 | { | |
1731 | unsigned int iter; | |
1732 | struct dentry *dentry = NULL; | |
1733 | struct inode *inode = NULL; | |
1734 | ||
1735 | sel_remove_entries(policycap_dir); | |
1736 | ||
1737 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1738 | if (iter < ARRAY_SIZE(policycap_names)) | |
1739 | dentry = d_alloc_name(policycap_dir, | |
1740 | policycap_names[iter]); | |
1741 | else | |
1742 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1743 | ||
1744 | if (dentry == NULL) | |
1745 | return -ENOMEM; | |
1746 | ||
1747 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1748 | if (inode == NULL) | |
1749 | return -ENOMEM; | |
1750 | ||
1751 | inode->i_fop = &sel_policycap_ops; | |
1752 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1753 | d_add(dentry, inode); | |
1754 | } | |
1755 | ||
1756 | return 0; | |
1757 | } | |
1758 | ||
0dd4ae51 CP |
1759 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1760 | unsigned long *ino) | |
1da177e4 | 1761 | { |
1da177e4 LT |
1762 | struct inode *inode; |
1763 | ||
edb20fb5 | 1764 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
b77a493b EP |
1765 | if (!inode) |
1766 | return -ENOMEM; | |
1767 | ||
1da177e4 LT |
1768 | inode->i_op = &simple_dir_inode_operations; |
1769 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1770 | inode->i_ino = ++(*ino); |
40e906f8 | 1771 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1772 | inc_nlink(inode); |
1da177e4 | 1773 | d_add(dentry, inode); |
edb20fb5 | 1774 | /* bump link count on parent directory, too */ |
d8c76e6f | 1775 | inc_nlink(dir); |
b77a493b EP |
1776 | |
1777 | return 0; | |
1da177e4 LT |
1778 | } |
1779 | ||
1872981b | 1780 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1781 | { |
1782 | int ret; | |
1783 | struct dentry *dentry; | |
edb20fb5 | 1784 | struct inode *inode, *root_inode; |
1da177e4 LT |
1785 | struct inode_security_struct *isec; |
1786 | ||
1787 | static struct tree_descr selinux_files[] = { | |
1788 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1789 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1790 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1791 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1792 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1793 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1794 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1795 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1796 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1797 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1798 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1799 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1800 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1801 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1802 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1803 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
cee74f47 | 1804 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, |
1da177e4 LT |
1805 | /* last one */ {""} |
1806 | }; | |
1807 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1808 | if (ret) | |
161ce45a | 1809 | goto err; |
1da177e4 | 1810 | |
edb20fb5 JM |
1811 | root_inode = sb->s_root->d_inode; |
1812 | ||
b77a493b | 1813 | ret = -ENOMEM; |
1da177e4 | 1814 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
b77a493b | 1815 | if (!dentry) |
161ce45a | 1816 | goto err; |
1da177e4 | 1817 | |
0dd4ae51 | 1818 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1819 | if (ret) |
161ce45a | 1820 | goto err; |
cde174a8 | 1821 | |
1da177e4 | 1822 | bool_dir = dentry; |
1da177e4 | 1823 | |
b77a493b | 1824 | ret = -ENOMEM; |
1da177e4 | 1825 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1826 | if (!dentry) |
161ce45a | 1827 | goto err; |
1da177e4 | 1828 | |
b77a493b | 1829 | ret = -ENOMEM; |
1da177e4 | 1830 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1831 | if (!inode) |
161ce45a | 1832 | goto err; |
b77a493b | 1833 | |
6174eafc | 1834 | inode->i_ino = ++sel_last_ino; |
1872981b | 1835 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1836 | isec->sid = SECINITSID_DEVNULL; |
1837 | isec->sclass = SECCLASS_CHR_FILE; | |
1838 | isec->initialized = 1; | |
1839 | ||
1840 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1841 | d_add(dentry, inode); | |
1842 | selinux_null = dentry; | |
1843 | ||
b77a493b | 1844 | ret = -ENOMEM; |
1da177e4 | 1845 | dentry = d_alloc_name(sb->s_root, "avc"); |
b77a493b | 1846 | if (!dentry) |
161ce45a | 1847 | goto err; |
1da177e4 | 1848 | |
0dd4ae51 | 1849 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1850 | if (ret) |
161ce45a | 1851 | goto err; |
1da177e4 LT |
1852 | |
1853 | ret = sel_make_avc_files(dentry); | |
1854 | if (ret) | |
161ce45a | 1855 | goto err; |
f0ee2e46 | 1856 | |
b77a493b | 1857 | ret = -ENOMEM; |
f0ee2e46 | 1858 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); |
b77a493b | 1859 | if (!dentry) |
f0ee2e46 | 1860 | goto err; |
f0ee2e46 | 1861 | |
0dd4ae51 | 1862 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1863 | if (ret) |
1864 | goto err; | |
1865 | ||
1866 | ret = sel_make_initcon_files(dentry); | |
1867 | if (ret) | |
1868 | goto err; | |
1869 | ||
b77a493b | 1870 | ret = -ENOMEM; |
e47c8fc5 | 1871 | dentry = d_alloc_name(sb->s_root, "class"); |
b77a493b | 1872 | if (!dentry) |
e47c8fc5 | 1873 | goto err; |
e47c8fc5 CP |
1874 | |
1875 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1876 | if (ret) | |
1877 | goto err; | |
1878 | ||
1879 | class_dir = dentry; | |
1880 | ||
b77a493b | 1881 | ret = -ENOMEM; |
3bb56b25 | 1882 | dentry = d_alloc_name(sb->s_root, "policy_capabilities"); |
b77a493b | 1883 | if (!dentry) |
3bb56b25 | 1884 | goto err; |
3bb56b25 PM |
1885 | |
1886 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1887 | if (ret) | |
1888 | goto err; | |
1889 | ||
1890 | policycap_dir = dentry; | |
1891 | ||
b77a493b | 1892 | return 0; |
161ce45a | 1893 | err: |
744ba35e EP |
1894 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1895 | __func__); | |
b77a493b | 1896 | return ret; |
1da177e4 LT |
1897 | } |
1898 | ||
fc14f2fe AV |
1899 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1900 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1901 | { |
fc14f2fe | 1902 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | static struct file_system_type sel_fs_type = { | |
1906 | .name = "selinuxfs", | |
fc14f2fe | 1907 | .mount = sel_mount, |
1da177e4 LT |
1908 | .kill_sb = kill_litter_super, |
1909 | }; | |
1910 | ||
1911 | struct vfsmount *selinuxfs_mount; | |
1912 | ||
1913 | static int __init init_sel_fs(void) | |
1914 | { | |
1915 | int err; | |
1916 | ||
1917 | if (!selinux_enabled) | |
1918 | return 0; | |
1919 | err = register_filesystem(&sel_fs_type); | |
b77a493b EP |
1920 | if (err) |
1921 | return err; | |
1922 | ||
1923 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1924 | if (IS_ERR(selinuxfs_mount)) { | |
1925 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1926 | err = PTR_ERR(selinuxfs_mount); | |
1927 | selinuxfs_mount = NULL; | |
1da177e4 | 1928 | } |
b77a493b | 1929 | |
1da177e4 LT |
1930 | return err; |
1931 | } | |
1932 | ||
1933 | __initcall(init_sel_fs); | |
1934 | ||
1935 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1936 | void exit_sel_fs(void) | |
1937 | { | |
1938 | unregister_filesystem(&sel_fs_type); | |
1939 | } | |
1940 | #endif |