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Commit | Line | Data |
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1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
1872981b | 3 | * Added conditional policy language extensions |
1da177e4 | 4 | * |
3bb56b25 PM |
5 | * Updated: Hewlett-Packard <paul.moore@hp.com> |
6 | * | |
1872981b | 7 | * Added support for the policy capability bitmap |
3bb56b25 PM |
8 | * |
9 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
10 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
11 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
12 | * This program is free software; you can redistribute it and/or modify | |
1872981b | 13 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
14 | * the Free Software Foundation, version 2. |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
bb003079 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/percpu.h> | |
af601e46 | 29 | #include <linux/audit.h> |
f5269710 | 30 | #include <linux/uaccess.h> |
1da177e4 LT |
31 | |
32 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
33 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
34 | ||
35 | #include "flask.h" | |
36 | #include "avc.h" | |
37 | #include "avc_ss.h" | |
38 | #include "security.h" | |
39 | #include "objsec.h" | |
40 | #include "conditional.h" | |
41 | ||
3bb56b25 PM |
42 | /* Policy capability filenames */ |
43 | static char *policycap_names[] = { | |
b0c636b9 EP |
44 | "network_peer_controls", |
45 | "open_perms" | |
3bb56b25 PM |
46 | }; |
47 | ||
1da177e4 LT |
48 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
49 | ||
50 | static int __init checkreqprot_setup(char *str) | |
51 | { | |
f5269710 EP |
52 | unsigned long checkreqprot; |
53 | if (!strict_strtoul(str, 0, &checkreqprot)) | |
54 | selinux_checkreqprot = checkreqprot ? 1 : 0; | |
1da177e4 LT |
55 | return 1; |
56 | } | |
57 | __setup("checkreqprot=", checkreqprot_setup); | |
58 | ||
bb003079 | 59 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
60 | |
61 | /* global data for booleans */ | |
1872981b EP |
62 | static struct dentry *bool_dir; |
63 | static int bool_num; | |
d313f948 | 64 | static char **bool_pending_names; |
1872981b | 65 | static int *bool_pending_values; |
1da177e4 | 66 | |
e47c8fc5 | 67 | /* global data for classes */ |
1872981b | 68 | static struct dentry *class_dir; |
e47c8fc5 CP |
69 | static unsigned long last_class_ino; |
70 | ||
cee74f47 EP |
71 | static char policy_opened; |
72 | ||
3bb56b25 | 73 | /* global data for policy capabilities */ |
1872981b | 74 | static struct dentry *policycap_dir; |
3bb56b25 | 75 | |
1da177e4 LT |
76 | extern void selnl_notify_setenforce(int val); |
77 | ||
78 | /* Check whether a task is allowed to use a security operation. */ | |
79 | static int task_has_security(struct task_struct *tsk, | |
80 | u32 perms) | |
81 | { | |
c69e8d9c DH |
82 | const struct task_security_struct *tsec; |
83 | u32 sid = 0; | |
84 | ||
85 | rcu_read_lock(); | |
86 | tsec = __task_cred(tsk)->security; | |
87 | if (tsec) | |
88 | sid = tsec->sid; | |
89 | rcu_read_unlock(); | |
1da177e4 LT |
90 | if (!tsec) |
91 | return -EACCES; | |
92 | ||
c69e8d9c | 93 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
94 | SECCLASS_SECURITY, perms, NULL); |
95 | } | |
96 | ||
97 | enum sel_inos { | |
98 | SEL_ROOT_INO = 2, | |
99 | SEL_LOAD, /* load policy */ | |
100 | SEL_ENFORCE, /* get or set enforcing status */ | |
101 | SEL_CONTEXT, /* validate context */ | |
102 | SEL_ACCESS, /* compute access decision */ | |
103 | SEL_CREATE, /* compute create labeling decision */ | |
104 | SEL_RELABEL, /* compute relabeling decision */ | |
105 | SEL_USER, /* compute reachable user contexts */ | |
106 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
107 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
108 | SEL_MLS, /* return if MLS policy is enabled */ | |
109 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
110 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
111 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 112 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
113 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
114 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 115 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 116 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
6174eafc | 117 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
118 | }; |
119 | ||
6174eafc JC |
120 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
121 | ||
3bb56b25 PM |
122 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
123 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
124 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
125 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
126 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 127 | |
1da177e4 LT |
128 | #define TMPBUFLEN 12 |
129 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
130 | size_t count, loff_t *ppos) | |
131 | { | |
132 | char tmpbuf[TMPBUFLEN]; | |
133 | ssize_t length; | |
134 | ||
135 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
136 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
137 | } | |
138 | ||
139 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 140 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
141 | size_t count, loff_t *ppos) |
142 | ||
143 | { | |
144 | char *page; | |
145 | ssize_t length; | |
146 | int new_value; | |
147 | ||
bfd51626 | 148 | if (count >= PAGE_SIZE) |
1da177e4 LT |
149 | return -ENOMEM; |
150 | if (*ppos != 0) { | |
151 | /* No partial writes. */ | |
152 | return -EINVAL; | |
153 | } | |
1872981b | 154 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
155 | if (!page) |
156 | return -ENOMEM; | |
157 | length = -EFAULT; | |
158 | if (copy_from_user(page, buf, count)) | |
159 | goto out; | |
160 | ||
161 | length = -EINVAL; | |
162 | if (sscanf(page, "%d", &new_value) != 1) | |
163 | goto out; | |
164 | ||
165 | if (new_value != selinux_enforcing) { | |
166 | length = task_has_security(current, SECURITY__SETENFORCE); | |
167 | if (length) | |
168 | goto out; | |
af601e46 | 169 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
170 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
171 | new_value, selinux_enforcing, | |
172 | audit_get_loginuid(current), | |
173 | audit_get_sessionid(current)); | |
1da177e4 LT |
174 | selinux_enforcing = new_value; |
175 | if (selinux_enforcing) | |
176 | avc_ss_reset(0); | |
177 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 178 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
179 | } |
180 | length = count; | |
181 | out: | |
182 | free_page((unsigned long) page); | |
183 | return length; | |
184 | } | |
185 | #else | |
186 | #define sel_write_enforce NULL | |
187 | #endif | |
188 | ||
9c2e08c5 | 189 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
190 | .read = sel_read_enforce, |
191 | .write = sel_write_enforce, | |
57a62c23 | 192 | .llseek = generic_file_llseek, |
1da177e4 LT |
193 | }; |
194 | ||
3f12070e EP |
195 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
196 | size_t count, loff_t *ppos) | |
197 | { | |
198 | char tmpbuf[TMPBUFLEN]; | |
199 | ssize_t length; | |
200 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
201 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? | |
202 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
203 | ||
204 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
205 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
206 | } | |
207 | ||
208 | static const struct file_operations sel_handle_unknown_ops = { | |
209 | .read = sel_read_handle_unknown, | |
57a62c23 | 210 | .llseek = generic_file_llseek, |
3f12070e EP |
211 | }; |
212 | ||
11904167 KK |
213 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
214 | { | |
215 | struct page *status = selinux_kernel_status_page(); | |
216 | ||
217 | if (!status) | |
218 | return -ENOMEM; | |
219 | ||
220 | filp->private_data = status; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
226 | size_t count, loff_t *ppos) | |
227 | { | |
228 | struct page *status = filp->private_data; | |
229 | ||
230 | BUG_ON(!status); | |
231 | ||
232 | return simple_read_from_buffer(buf, count, ppos, | |
233 | page_address(status), | |
234 | sizeof(struct selinux_kernel_status)); | |
235 | } | |
236 | ||
237 | static int sel_mmap_handle_status(struct file *filp, | |
238 | struct vm_area_struct *vma) | |
239 | { | |
240 | struct page *status = filp->private_data; | |
241 | unsigned long size = vma->vm_end - vma->vm_start; | |
242 | ||
243 | BUG_ON(!status); | |
244 | ||
245 | /* only allows one page from the head */ | |
246 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
247 | return -EIO; | |
248 | /* disallow writable mapping */ | |
249 | if (vma->vm_flags & VM_WRITE) | |
250 | return -EPERM; | |
251 | /* disallow mprotect() turns it into writable */ | |
252 | vma->vm_flags &= ~VM_MAYWRITE; | |
253 | ||
254 | return remap_pfn_range(vma, vma->vm_start, | |
255 | page_to_pfn(status), | |
256 | size, vma->vm_page_prot); | |
257 | } | |
258 | ||
259 | static const struct file_operations sel_handle_status_ops = { | |
260 | .open = sel_open_handle_status, | |
261 | .read = sel_read_handle_status, | |
262 | .mmap = sel_mmap_handle_status, | |
263 | .llseek = generic_file_llseek, | |
264 | }; | |
265 | ||
1da177e4 | 266 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 267 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
268 | size_t count, loff_t *ppos) |
269 | ||
270 | { | |
271 | char *page; | |
272 | ssize_t length; | |
273 | int new_value; | |
274 | extern int selinux_disable(void); | |
275 | ||
bfd51626 | 276 | if (count >= PAGE_SIZE) |
1da177e4 LT |
277 | return -ENOMEM; |
278 | if (*ppos != 0) { | |
279 | /* No partial writes. */ | |
280 | return -EINVAL; | |
281 | } | |
1872981b | 282 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
283 | if (!page) |
284 | return -ENOMEM; | |
285 | length = -EFAULT; | |
286 | if (copy_from_user(page, buf, count)) | |
287 | goto out; | |
288 | ||
289 | length = -EINVAL; | |
290 | if (sscanf(page, "%d", &new_value) != 1) | |
291 | goto out; | |
292 | ||
293 | if (new_value) { | |
294 | length = selinux_disable(); | |
295 | if (length < 0) | |
296 | goto out; | |
af601e46 | 297 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
298 | "selinux=0 auid=%u ses=%u", |
299 | audit_get_loginuid(current), | |
300 | audit_get_sessionid(current)); | |
1da177e4 LT |
301 | } |
302 | ||
303 | length = count; | |
304 | out: | |
305 | free_page((unsigned long) page); | |
306 | return length; | |
307 | } | |
308 | #else | |
309 | #define sel_write_disable NULL | |
310 | #endif | |
311 | ||
9c2e08c5 | 312 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 313 | .write = sel_write_disable, |
57a62c23 | 314 | .llseek = generic_file_llseek, |
1da177e4 LT |
315 | }; |
316 | ||
317 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 318 | size_t count, loff_t *ppos) |
1da177e4 LT |
319 | { |
320 | char tmpbuf[TMPBUFLEN]; | |
321 | ssize_t length; | |
322 | ||
323 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
324 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
325 | } | |
326 | ||
9c2e08c5 | 327 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 328 | .read = sel_read_policyvers, |
57a62c23 | 329 | .llseek = generic_file_llseek, |
1da177e4 LT |
330 | }; |
331 | ||
332 | /* declaration for sel_write_load */ | |
333 | static int sel_make_bools(void); | |
e47c8fc5 | 334 | static int sel_make_classes(void); |
3bb56b25 | 335 | static int sel_make_policycap(void); |
e47c8fc5 CP |
336 | |
337 | /* declaration for sel_make_class_dirs */ | |
338 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
339 | unsigned long *ino); | |
1da177e4 LT |
340 | |
341 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
342 | size_t count, loff_t *ppos) | |
343 | { | |
344 | char tmpbuf[TMPBUFLEN]; | |
345 | ssize_t length; | |
346 | ||
0719aaf5 GT |
347 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
348 | security_mls_enabled()); | |
1da177e4 LT |
349 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
350 | } | |
351 | ||
9c2e08c5 | 352 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 353 | .read = sel_read_mls, |
57a62c23 | 354 | .llseek = generic_file_llseek, |
1da177e4 LT |
355 | }; |
356 | ||
cee74f47 EP |
357 | struct policy_load_memory { |
358 | size_t len; | |
359 | void *data; | |
360 | }; | |
361 | ||
362 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
363 | { | |
364 | struct policy_load_memory *plm = NULL; | |
365 | int rc; | |
366 | ||
367 | BUG_ON(filp->private_data); | |
368 | ||
369 | mutex_lock(&sel_mutex); | |
370 | ||
371 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
372 | if (rc) | |
373 | goto err; | |
374 | ||
375 | rc = -EBUSY; | |
376 | if (policy_opened) | |
377 | goto err; | |
378 | ||
379 | rc = -ENOMEM; | |
380 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
381 | if (!plm) | |
382 | goto err; | |
383 | ||
384 | if (i_size_read(inode) != security_policydb_len()) { | |
385 | mutex_lock(&inode->i_mutex); | |
386 | i_size_write(inode, security_policydb_len()); | |
387 | mutex_unlock(&inode->i_mutex); | |
388 | } | |
389 | ||
390 | rc = security_read_policy(&plm->data, &plm->len); | |
391 | if (rc) | |
392 | goto err; | |
393 | ||
394 | policy_opened = 1; | |
395 | ||
396 | filp->private_data = plm; | |
397 | ||
398 | mutex_unlock(&sel_mutex); | |
399 | ||
400 | return 0; | |
401 | err: | |
402 | mutex_unlock(&sel_mutex); | |
403 | ||
404 | if (plm) | |
405 | vfree(plm->data); | |
406 | kfree(plm); | |
407 | return rc; | |
408 | } | |
409 | ||
410 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
411 | { | |
412 | struct policy_load_memory *plm = filp->private_data; | |
413 | ||
414 | BUG_ON(!plm); | |
415 | ||
416 | policy_opened = 0; | |
417 | ||
418 | vfree(plm->data); | |
419 | kfree(plm); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
425 | size_t count, loff_t *ppos) | |
426 | { | |
427 | struct policy_load_memory *plm = filp->private_data; | |
428 | int ret; | |
429 | ||
430 | mutex_lock(&sel_mutex); | |
431 | ||
432 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
433 | if (ret) | |
434 | goto out; | |
435 | ||
436 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
437 | out: | |
438 | mutex_unlock(&sel_mutex); | |
439 | return ret; | |
440 | } | |
441 | ||
442 | static const struct file_operations sel_policy_ops = { | |
443 | .open = sel_open_policy, | |
444 | .read = sel_read_policy, | |
445 | .release = sel_release_policy, | |
446 | }; | |
447 | ||
1872981b | 448 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
449 | size_t count, loff_t *ppos) |
450 | ||
451 | { | |
452 | int ret; | |
453 | ssize_t length; | |
454 | void *data = NULL; | |
455 | ||
bb003079 | 456 | mutex_lock(&sel_mutex); |
1da177e4 LT |
457 | |
458 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
459 | if (length) | |
460 | goto out; | |
461 | ||
462 | if (*ppos != 0) { | |
463 | /* No partial writes. */ | |
464 | length = -EINVAL; | |
465 | goto out; | |
466 | } | |
467 | ||
bfd51626 | 468 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
469 | || (data = vmalloc(count)) == NULL) { |
470 | length = -ENOMEM; | |
471 | goto out; | |
472 | } | |
473 | ||
474 | length = -EFAULT; | |
475 | if (copy_from_user(data, buf, count) != 0) | |
476 | goto out; | |
477 | ||
478 | length = security_load_policy(data, count); | |
479 | if (length) | |
480 | goto out; | |
481 | ||
482 | ret = sel_make_bools(); | |
e47c8fc5 CP |
483 | if (ret) { |
484 | length = ret; | |
485 | goto out1; | |
486 | } | |
487 | ||
488 | ret = sel_make_classes(); | |
3bb56b25 PM |
489 | if (ret) { |
490 | length = ret; | |
491 | goto out1; | |
492 | } | |
493 | ||
494 | ret = sel_make_policycap(); | |
1da177e4 LT |
495 | if (ret) |
496 | length = ret; | |
497 | else | |
498 | length = count; | |
e47c8fc5 CP |
499 | |
500 | out1: | |
af601e46 | 501 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b EP |
502 | "policy loaded auid=%u ses=%u", |
503 | audit_get_loginuid(current), | |
504 | audit_get_sessionid(current)); | |
1da177e4 | 505 | out: |
bb003079 | 506 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
507 | vfree(data); |
508 | return length; | |
509 | } | |
510 | ||
9c2e08c5 | 511 | static const struct file_operations sel_load_ops = { |
1da177e4 | 512 | .write = sel_write_load, |
57a62c23 | 513 | .llseek = generic_file_llseek, |
1da177e4 LT |
514 | }; |
515 | ||
1872981b | 516 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 517 | { |
ce9982d0 SS |
518 | char *canon; |
519 | u32 sid, len; | |
1da177e4 LT |
520 | ssize_t length; |
521 | ||
522 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
523 | if (length) | |
524 | return length; | |
525 | ||
ce9982d0 SS |
526 | length = security_context_to_sid(buf, size, &sid); |
527 | if (length < 0) | |
528 | return length; | |
1da177e4 | 529 | |
ce9982d0 | 530 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 531 | if (length < 0) |
ce9982d0 SS |
532 | return length; |
533 | ||
534 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
535 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
536 | "payload max\n", __func__, len); | |
ce9982d0 | 537 | length = -ERANGE; |
1da177e4 | 538 | goto out; |
ce9982d0 | 539 | } |
1da177e4 | 540 | |
ce9982d0 SS |
541 | memcpy(buf, canon, len); |
542 | length = len; | |
1da177e4 | 543 | out: |
ce9982d0 | 544 | kfree(canon); |
1da177e4 LT |
545 | return length; |
546 | } | |
547 | ||
1da177e4 LT |
548 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
549 | size_t count, loff_t *ppos) | |
550 | { | |
551 | char tmpbuf[TMPBUFLEN]; | |
552 | ssize_t length; | |
553 | ||
554 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
555 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
556 | } | |
557 | ||
1872981b | 558 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
559 | size_t count, loff_t *ppos) |
560 | { | |
561 | char *page; | |
562 | ssize_t length; | |
563 | unsigned int new_value; | |
564 | ||
565 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
566 | if (length) | |
567 | return length; | |
568 | ||
bfd51626 | 569 | if (count >= PAGE_SIZE) |
1da177e4 LT |
570 | return -ENOMEM; |
571 | if (*ppos != 0) { | |
572 | /* No partial writes. */ | |
573 | return -EINVAL; | |
574 | } | |
1872981b | 575 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
576 | if (!page) |
577 | return -ENOMEM; | |
578 | length = -EFAULT; | |
579 | if (copy_from_user(page, buf, count)) | |
580 | goto out; | |
581 | ||
582 | length = -EINVAL; | |
583 | if (sscanf(page, "%u", &new_value) != 1) | |
584 | goto out; | |
585 | ||
586 | selinux_checkreqprot = new_value ? 1 : 0; | |
587 | length = count; | |
588 | out: | |
589 | free_page((unsigned long) page); | |
590 | return length; | |
591 | } | |
9c2e08c5 | 592 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
593 | .read = sel_read_checkreqprot, |
594 | .write = sel_write_checkreqprot, | |
57a62c23 | 595 | .llseek = generic_file_llseek, |
1da177e4 LT |
596 | }; |
597 | ||
598 | /* | |
599 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
600 | */ | |
1872981b EP |
601 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
602 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
603 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
604 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
605 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
606 | |
607 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
608 | [SEL_ACCESS] = sel_write_access, | |
609 | [SEL_CREATE] = sel_write_create, | |
610 | [SEL_RELABEL] = sel_write_relabel, | |
611 | [SEL_USER] = sel_write_user, | |
612 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 613 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
614 | }; |
615 | ||
616 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
617 | { | |
1872981b | 618 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
619 | char *data; |
620 | ssize_t rv; | |
621 | ||
6e20a64a | 622 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
623 | return -EINVAL; |
624 | ||
625 | data = simple_transaction_get(file, buf, size); | |
626 | if (IS_ERR(data)) | |
627 | return PTR_ERR(data); | |
628 | ||
1872981b EP |
629 | rv = write_op[ino](file, data, size); |
630 | if (rv > 0) { | |
1da177e4 LT |
631 | simple_transaction_set(file, rv); |
632 | rv = size; | |
633 | } | |
634 | return rv; | |
635 | } | |
636 | ||
9c2e08c5 | 637 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
638 | .write = selinux_transaction_write, |
639 | .read = simple_transaction_read, | |
640 | .release = simple_transaction_release, | |
57a62c23 | 641 | .llseek = generic_file_llseek, |
1da177e4 LT |
642 | }; |
643 | ||
644 | /* | |
645 | * payload - write methods | |
646 | * If the method has a response, the response should be put in buf, | |
647 | * and the length returned. Otherwise return 0 or and -error. | |
648 | */ | |
649 | ||
1872981b | 650 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 LT |
651 | { |
652 | char *scon, *tcon; | |
653 | u32 ssid, tsid; | |
654 | u16 tclass; | |
1da177e4 LT |
655 | struct av_decision avd; |
656 | ssize_t length; | |
657 | ||
658 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
659 | if (length) | |
660 | return length; | |
661 | ||
662 | length = -ENOMEM; | |
c1a7368a | 663 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
664 | if (!scon) |
665 | return length; | |
1da177e4 | 666 | |
c1a7368a | 667 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
668 | if (!tcon) |
669 | goto out; | |
1da177e4 LT |
670 | |
671 | length = -EINVAL; | |
19439d05 | 672 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
1da177e4 LT |
673 | goto out2; |
674 | ||
c1a7368a | 675 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
676 | if (length < 0) |
677 | goto out2; | |
c1a7368a | 678 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
679 | if (length < 0) |
680 | goto out2; | |
681 | ||
19439d05 | 682 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
683 | |
684 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 685 | "%x %x %x %x %u %x", |
f1c6381a | 686 | avd.allowed, 0xffffffff, |
1da177e4 | 687 | avd.auditallow, avd.auditdeny, |
8a6f83af | 688 | avd.seqno, avd.flags); |
1da177e4 LT |
689 | out2: |
690 | kfree(tcon); | |
691 | out: | |
692 | kfree(scon); | |
693 | return length; | |
694 | } | |
695 | ||
1872981b | 696 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 LT |
697 | { |
698 | char *scon, *tcon; | |
699 | u32 ssid, tsid, newsid; | |
700 | u16 tclass; | |
701 | ssize_t length; | |
702 | char *newcon; | |
703 | u32 len; | |
704 | ||
705 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
706 | if (length) | |
707 | return length; | |
708 | ||
709 | length = -ENOMEM; | |
c1a7368a | 710 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
711 | if (!scon) |
712 | return length; | |
1da177e4 | 713 | |
c1a7368a | 714 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
715 | if (!tcon) |
716 | goto out; | |
1da177e4 LT |
717 | |
718 | length = -EINVAL; | |
719 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
720 | goto out2; | |
721 | ||
c1a7368a | 722 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
723 | if (length < 0) |
724 | goto out2; | |
c1a7368a | 725 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
726 | if (length < 0) |
727 | goto out2; | |
728 | ||
c6d3aaa4 | 729 | length = security_transition_sid_user(ssid, tsid, tclass, &newsid); |
1da177e4 LT |
730 | if (length < 0) |
731 | goto out2; | |
732 | ||
733 | length = security_sid_to_context(newsid, &newcon, &len); | |
734 | if (length < 0) | |
735 | goto out2; | |
736 | ||
737 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
738 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
739 | "payload max\n", __func__, len); | |
1da177e4 LT |
740 | length = -ERANGE; |
741 | goto out3; | |
742 | } | |
743 | ||
744 | memcpy(buf, newcon, len); | |
745 | length = len; | |
746 | out3: | |
747 | kfree(newcon); | |
748 | out2: | |
749 | kfree(tcon); | |
750 | out: | |
751 | kfree(scon); | |
752 | return length; | |
753 | } | |
754 | ||
1872981b | 755 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 LT |
756 | { |
757 | char *scon, *tcon; | |
758 | u32 ssid, tsid, newsid; | |
759 | u16 tclass; | |
760 | ssize_t length; | |
761 | char *newcon; | |
762 | u32 len; | |
763 | ||
764 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
765 | if (length) | |
766 | return length; | |
767 | ||
768 | length = -ENOMEM; | |
c1a7368a | 769 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
770 | if (!scon) |
771 | return length; | |
1da177e4 | 772 | |
c1a7368a | 773 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
774 | if (!tcon) |
775 | goto out; | |
1da177e4 LT |
776 | |
777 | length = -EINVAL; | |
778 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
779 | goto out2; | |
780 | ||
c1a7368a | 781 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
782 | if (length < 0) |
783 | goto out2; | |
c1a7368a | 784 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
785 | if (length < 0) |
786 | goto out2; | |
787 | ||
788 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
789 | if (length < 0) | |
790 | goto out2; | |
791 | ||
792 | length = security_sid_to_context(newsid, &newcon, &len); | |
793 | if (length < 0) | |
794 | goto out2; | |
795 | ||
796 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
797 | length = -ERANGE; | |
798 | goto out3; | |
799 | } | |
800 | ||
801 | memcpy(buf, newcon, len); | |
802 | length = len; | |
803 | out3: | |
804 | kfree(newcon); | |
805 | out2: | |
806 | kfree(tcon); | |
807 | out: | |
808 | kfree(scon); | |
809 | return length; | |
810 | } | |
811 | ||
1872981b | 812 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 LT |
813 | { |
814 | char *con, *user, *ptr; | |
815 | u32 sid, *sids; | |
816 | ssize_t length; | |
817 | char *newcon; | |
818 | int i, rc; | |
819 | u32 len, nsids; | |
820 | ||
821 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
822 | if (length) | |
823 | return length; | |
824 | ||
825 | length = -ENOMEM; | |
c1a7368a | 826 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
827 | if (!con) |
828 | return length; | |
1da177e4 | 829 | |
c1a7368a | 830 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
831 | if (!user) |
832 | goto out; | |
1da177e4 LT |
833 | |
834 | length = -EINVAL; | |
835 | if (sscanf(buf, "%s %s", con, user) != 2) | |
836 | goto out2; | |
837 | ||
c1a7368a | 838 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
1da177e4 LT |
839 | if (length < 0) |
840 | goto out2; | |
841 | ||
842 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
843 | if (length < 0) | |
844 | goto out2; | |
845 | ||
846 | length = sprintf(buf, "%u", nsids) + 1; | |
847 | ptr = buf + length; | |
848 | for (i = 0; i < nsids; i++) { | |
849 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
850 | if (rc) { | |
851 | length = rc; | |
852 | goto out3; | |
853 | } | |
854 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
855 | kfree(newcon); | |
856 | length = -ERANGE; | |
857 | goto out3; | |
858 | } | |
859 | memcpy(ptr, newcon, len); | |
860 | kfree(newcon); | |
861 | ptr += len; | |
862 | length += len; | |
863 | } | |
864 | out3: | |
865 | kfree(sids); | |
866 | out2: | |
867 | kfree(user); | |
868 | out: | |
869 | kfree(con); | |
870 | return length; | |
871 | } | |
872 | ||
1872981b | 873 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 LT |
874 | { |
875 | char *scon, *tcon; | |
876 | u32 ssid, tsid, newsid; | |
877 | u16 tclass; | |
878 | ssize_t length; | |
879 | char *newcon; | |
880 | u32 len; | |
881 | ||
882 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
883 | if (length) | |
884 | return length; | |
885 | ||
886 | length = -ENOMEM; | |
c1a7368a | 887 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
888 | if (!scon) |
889 | return length; | |
1da177e4 | 890 | |
c1a7368a | 891 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
892 | if (!tcon) |
893 | goto out; | |
1da177e4 LT |
894 | |
895 | length = -EINVAL; | |
896 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
897 | goto out2; | |
898 | ||
c1a7368a | 899 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
1da177e4 LT |
900 | if (length < 0) |
901 | goto out2; | |
c1a7368a | 902 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
1da177e4 LT |
903 | if (length < 0) |
904 | goto out2; | |
905 | ||
906 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
907 | if (length < 0) | |
908 | goto out2; | |
909 | ||
910 | length = security_sid_to_context(newsid, &newcon, &len); | |
911 | if (length < 0) | |
912 | goto out2; | |
913 | ||
914 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
744ba35e EP |
915 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
916 | "payload max\n", __func__, len); | |
1da177e4 LT |
917 | length = -ERANGE; |
918 | goto out3; | |
919 | } | |
920 | ||
921 | memcpy(buf, newcon, len); | |
922 | length = len; | |
923 | out3: | |
924 | kfree(newcon); | |
925 | out2: | |
926 | kfree(tcon); | |
927 | out: | |
928 | kfree(scon); | |
929 | return length; | |
930 | } | |
931 | ||
932 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
933 | { | |
934 | struct inode *ret = new_inode(sb); | |
935 | ||
936 | if (ret) { | |
937 | ret->i_mode = mode; | |
1da177e4 LT |
938 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
939 | } | |
940 | return ret; | |
941 | } | |
942 | ||
1da177e4 LT |
943 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
944 | size_t count, loff_t *ppos) | |
945 | { | |
946 | char *page = NULL; | |
947 | ssize_t length; | |
1da177e4 LT |
948 | ssize_t ret; |
949 | int cur_enforcing; | |
d313f948 SS |
950 | struct inode *inode = filep->f_path.dentry->d_inode; |
951 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
952 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 953 | |
bb003079 | 954 | mutex_lock(&sel_mutex); |
1da177e4 | 955 | |
d313f948 SS |
956 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) { |
957 | ret = -EINVAL; | |
958 | goto out; | |
959 | } | |
1da177e4 | 960 | |
1872981b EP |
961 | page = (char *)get_zeroed_page(GFP_KERNEL); |
962 | if (!page) { | |
1da177e4 LT |
963 | ret = -ENOMEM; |
964 | goto out; | |
965 | } | |
966 | ||
d313f948 | 967 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
968 | if (cur_enforcing < 0) { |
969 | ret = cur_enforcing; | |
970 | goto out; | |
971 | } | |
1da177e4 | 972 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 973 | bool_pending_values[index]); |
68bdcf28 | 974 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 975 | out: |
bb003079 | 976 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
977 | if (page) |
978 | free_page((unsigned long)page); | |
979 | return ret; | |
980 | } | |
981 | ||
982 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
983 | size_t count, loff_t *ppos) | |
984 | { | |
985 | char *page = NULL; | |
d313f948 | 986 | ssize_t length; |
1da177e4 | 987 | int new_value; |
d313f948 SS |
988 | struct inode *inode = filep->f_path.dentry->d_inode; |
989 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
990 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 991 | |
bb003079 | 992 | mutex_lock(&sel_mutex); |
1da177e4 LT |
993 | |
994 | length = task_has_security(current, SECURITY__SETBOOL); | |
995 | if (length) | |
996 | goto out; | |
997 | ||
d313f948 SS |
998 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) { |
999 | length = -EINVAL; | |
1000 | goto out; | |
1001 | } | |
1002 | ||
bfd51626 | 1003 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1004 | length = -ENOMEM; |
1005 | goto out; | |
1006 | } | |
d313f948 | 1007 | |
1da177e4 LT |
1008 | if (*ppos != 0) { |
1009 | /* No partial writes. */ | |
d313f948 | 1010 | length = -EINVAL; |
1da177e4 LT |
1011 | goto out; |
1012 | } | |
1872981b | 1013 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1014 | if (!page) { |
1015 | length = -ENOMEM; | |
1016 | goto out; | |
1017 | } | |
1018 | ||
d313f948 | 1019 | length = -EFAULT; |
1da177e4 LT |
1020 | if (copy_from_user(page, buf, count)) |
1021 | goto out; | |
1022 | ||
1023 | length = -EINVAL; | |
1024 | if (sscanf(page, "%d", &new_value) != 1) | |
1025 | goto out; | |
1026 | ||
1027 | if (new_value) | |
1028 | new_value = 1; | |
1029 | ||
d313f948 | 1030 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1031 | length = count; |
1032 | ||
1033 | out: | |
bb003079 | 1034 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
1035 | if (page) |
1036 | free_page((unsigned long) page); | |
1037 | return length; | |
1038 | } | |
1039 | ||
9c2e08c5 | 1040 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1041 | .read = sel_read_bool, |
1042 | .write = sel_write_bool, | |
57a62c23 | 1043 | .llseek = generic_file_llseek, |
1da177e4 LT |
1044 | }; |
1045 | ||
1046 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1047 | const char __user *buf, | |
1048 | size_t count, loff_t *ppos) | |
1049 | { | |
1050 | char *page = NULL; | |
d313f948 | 1051 | ssize_t length; |
1da177e4 LT |
1052 | int new_value; |
1053 | ||
bb003079 | 1054 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1055 | |
1056 | length = task_has_security(current, SECURITY__SETBOOL); | |
1057 | if (length) | |
1058 | goto out; | |
1059 | ||
bfd51626 | 1060 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1061 | length = -ENOMEM; |
1062 | goto out; | |
1063 | } | |
1064 | if (*ppos != 0) { | |
1065 | /* No partial writes. */ | |
1066 | goto out; | |
1067 | } | |
1872981b | 1068 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1069 | if (!page) { |
1070 | length = -ENOMEM; | |
1071 | goto out; | |
1072 | } | |
1073 | ||
d313f948 | 1074 | length = -EFAULT; |
1da177e4 LT |
1075 | if (copy_from_user(page, buf, count)) |
1076 | goto out; | |
1077 | ||
1078 | length = -EINVAL; | |
1079 | if (sscanf(page, "%d", &new_value) != 1) | |
1080 | goto out; | |
1081 | ||
1872981b | 1082 | if (new_value && bool_pending_values) |
1da177e4 | 1083 | security_set_bools(bool_num, bool_pending_values); |
1da177e4 LT |
1084 | |
1085 | length = count; | |
1086 | ||
1087 | out: | |
bb003079 | 1088 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
1089 | if (page) |
1090 | free_page((unsigned long) page); | |
1091 | return length; | |
1092 | } | |
1093 | ||
9c2e08c5 | 1094 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1095 | .write = sel_commit_bools_write, |
57a62c23 | 1096 | .llseek = generic_file_llseek, |
1da177e4 LT |
1097 | }; |
1098 | ||
0c92d7c7 | 1099 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1100 | { |
0955dc03 | 1101 | struct list_head *node; |
1da177e4 LT |
1102 | |
1103 | spin_lock(&dcache_lock); | |
1104 | node = de->d_subdirs.next; | |
1105 | while (node != &de->d_subdirs) { | |
5160ee6f | 1106 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
1107 | list_del_init(node); |
1108 | ||
1109 | if (d->d_inode) { | |
1110 | d = dget_locked(d); | |
1111 | spin_unlock(&dcache_lock); | |
1112 | d_delete(d); | |
1113 | simple_unlink(de->d_inode, d); | |
1114 | dput(d); | |
1115 | spin_lock(&dcache_lock); | |
1116 | } | |
1117 | node = de->d_subdirs.next; | |
1118 | } | |
1119 | ||
1120 | spin_unlock(&dcache_lock); | |
1da177e4 LT |
1121 | } |
1122 | ||
1123 | #define BOOL_DIR_NAME "booleans" | |
1124 | ||
1125 | static int sel_make_bools(void) | |
1126 | { | |
1127 | int i, ret = 0; | |
1128 | ssize_t len; | |
1129 | struct dentry *dentry = NULL; | |
1130 | struct dentry *dir = bool_dir; | |
1131 | struct inode *inode = NULL; | |
1132 | struct inode_security_struct *isec; | |
1133 | char **names = NULL, *page; | |
1134 | int num; | |
1135 | int *values = NULL; | |
1136 | u32 sid; | |
1137 | ||
1138 | /* remove any existing files */ | |
8007f102 XF |
1139 | for (i = 0; i < bool_num; i++) |
1140 | kfree(bool_pending_names[i]); | |
d313f948 | 1141 | kfree(bool_pending_names); |
9a5f04bf | 1142 | kfree(bool_pending_values); |
d313f948 | 1143 | bool_pending_names = NULL; |
20c19e41 | 1144 | bool_pending_values = NULL; |
1da177e4 | 1145 | |
0c92d7c7 | 1146 | sel_remove_entries(dir); |
1da177e4 | 1147 | |
1872981b EP |
1148 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1149 | if (!page) | |
1da177e4 LT |
1150 | return -ENOMEM; |
1151 | ||
1152 | ret = security_get_bools(&num, &names, &values); | |
1153 | if (ret != 0) | |
1154 | goto out; | |
1155 | ||
1156 | for (i = 0; i < num; i++) { | |
1157 | dentry = d_alloc_name(dir, names[i]); | |
1158 | if (!dentry) { | |
1159 | ret = -ENOMEM; | |
1160 | goto err; | |
1161 | } | |
1162 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
1163 | if (!inode) { | |
1164 | ret = -ENOMEM; | |
1165 | goto err; | |
1166 | } | |
1167 | ||
1168 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1169 | if (len < 0) { | |
1170 | ret = -EINVAL; | |
1171 | goto err; | |
1172 | } else if (len >= PAGE_SIZE) { | |
1173 | ret = -ENAMETOOLONG; | |
1174 | goto err; | |
1175 | } | |
1872981b EP |
1176 | isec = (struct inode_security_struct *)inode->i_security; |
1177 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1178 | if (ret) | |
1da177e4 LT |
1179 | goto err; |
1180 | isec->sid = sid; | |
1181 | isec->initialized = 1; | |
1182 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1183 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1184 | d_add(dentry, inode); |
1185 | } | |
1186 | bool_num = num; | |
d313f948 | 1187 | bool_pending_names = names; |
1da177e4 LT |
1188 | bool_pending_values = values; |
1189 | out: | |
1190 | free_page((unsigned long)page); | |
d313f948 SS |
1191 | return ret; |
1192 | err: | |
1da177e4 | 1193 | if (names) { |
9a5f04bf JJ |
1194 | for (i = 0; i < num; i++) |
1195 | kfree(names[i]); | |
1da177e4 LT |
1196 | kfree(names); |
1197 | } | |
20c19e41 | 1198 | kfree(values); |
0c92d7c7 | 1199 | sel_remove_entries(dir); |
1da177e4 LT |
1200 | ret = -ENOMEM; |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | #define NULL_FILE_NAME "null" | |
1205 | ||
1872981b | 1206 | struct dentry *selinux_null; |
1da177e4 LT |
1207 | |
1208 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1209 | size_t count, loff_t *ppos) | |
1210 | { | |
1211 | char tmpbuf[TMPBUFLEN]; | |
1212 | ssize_t length; | |
1213 | ||
1214 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1215 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1216 | } | |
1217 | ||
1872981b EP |
1218 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1219 | const char __user *buf, | |
1da177e4 LT |
1220 | size_t count, loff_t *ppos) |
1221 | ||
1222 | { | |
1223 | char *page; | |
1224 | ssize_t ret; | |
1225 | int new_value; | |
1226 | ||
bfd51626 | 1227 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1228 | ret = -ENOMEM; |
1229 | goto out; | |
1230 | } | |
1231 | ||
1232 | if (*ppos != 0) { | |
1233 | /* No partial writes. */ | |
1234 | ret = -EINVAL; | |
1235 | goto out; | |
1236 | } | |
1237 | ||
1872981b | 1238 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
1239 | if (!page) { |
1240 | ret = -ENOMEM; | |
1241 | goto out; | |
1242 | } | |
1243 | ||
1244 | if (copy_from_user(page, buf, count)) { | |
1245 | ret = -EFAULT; | |
1246 | goto out_free; | |
1247 | } | |
1248 | ||
1249 | if (sscanf(page, "%u", &new_value) != 1) { | |
1250 | ret = -EINVAL; | |
1251 | goto out; | |
1252 | } | |
1253 | ||
1254 | if (new_value != avc_cache_threshold) { | |
1255 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1256 | if (ret) | |
1257 | goto out_free; | |
1258 | avc_cache_threshold = new_value; | |
1259 | } | |
1260 | ret = count; | |
1261 | out_free: | |
1262 | free_page((unsigned long)page); | |
1263 | out: | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1268 | size_t count, loff_t *ppos) | |
1269 | { | |
1270 | char *page; | |
1271 | ssize_t ret = 0; | |
1272 | ||
1273 | page = (char *)__get_free_page(GFP_KERNEL); | |
1274 | if (!page) { | |
1275 | ret = -ENOMEM; | |
1276 | goto out; | |
1277 | } | |
1278 | ret = avc_get_hash_stats(page); | |
1279 | if (ret >= 0) | |
1280 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1281 | free_page((unsigned long)page); | |
1282 | out: | |
1283 | return ret; | |
1284 | } | |
1285 | ||
9c2e08c5 | 1286 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1287 | .read = sel_read_avc_cache_threshold, |
1288 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1289 | .llseek = generic_file_llseek, |
1da177e4 LT |
1290 | }; |
1291 | ||
9c2e08c5 | 1292 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1293 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1294 | .llseek = generic_file_llseek, |
1da177e4 LT |
1295 | }; |
1296 | ||
1297 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1298 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1299 | { | |
1300 | int cpu; | |
1301 | ||
4f4b6c1a | 1302 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1303 | if (!cpu_possible(cpu)) |
1304 | continue; | |
1305 | *idx = cpu + 1; | |
1306 | return &per_cpu(avc_cache_stats, cpu); | |
1307 | } | |
1308 | return NULL; | |
1309 | } | |
1310 | ||
1311 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1312 | { | |
1313 | loff_t n = *pos - 1; | |
1314 | ||
1315 | if (*pos == 0) | |
1316 | return SEQ_START_TOKEN; | |
1317 | ||
1318 | return sel_avc_get_stat_idx(&n); | |
1319 | } | |
1320 | ||
1321 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1322 | { | |
1323 | return sel_avc_get_stat_idx(pos); | |
1324 | } | |
1325 | ||
1326 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1327 | { | |
1328 | struct avc_cache_stats *st = v; | |
1329 | ||
1330 | if (v == SEQ_START_TOKEN) | |
1331 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1332 | "frees\n"); | |
1333 | else | |
1334 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1335 | st->hits, st->misses, st->allocations, | |
1336 | st->reclaims, st->frees); | |
1337 | return 0; | |
1338 | } | |
1339 | ||
1340 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1341 | { } | |
1342 | ||
1996a109 | 1343 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1344 | .start = sel_avc_stats_seq_start, |
1345 | .next = sel_avc_stats_seq_next, | |
1346 | .show = sel_avc_stats_seq_show, | |
1347 | .stop = sel_avc_stats_seq_stop, | |
1348 | }; | |
1349 | ||
1350 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1351 | { | |
1352 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1353 | } | |
1354 | ||
9c2e08c5 | 1355 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1356 | .open = sel_open_avc_cache_stats, |
1357 | .read = seq_read, | |
1358 | .llseek = seq_lseek, | |
1359 | .release = seq_release, | |
1360 | }; | |
1361 | #endif | |
1362 | ||
1363 | static int sel_make_avc_files(struct dentry *dir) | |
1364 | { | |
1365 | int i, ret = 0; | |
1366 | static struct tree_descr files[] = { | |
1367 | { "cache_threshold", | |
1368 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1369 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1370 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1371 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1372 | #endif | |
1373 | }; | |
1374 | ||
6e20a64a | 1375 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1376 | struct inode *inode; |
1377 | struct dentry *dentry; | |
1378 | ||
1379 | dentry = d_alloc_name(dir, files[i].name); | |
1380 | if (!dentry) { | |
1381 | ret = -ENOMEM; | |
d6aafa65 | 1382 | goto out; |
1da177e4 LT |
1383 | } |
1384 | ||
1385 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1386 | if (!inode) { | |
1387 | ret = -ENOMEM; | |
d6aafa65 | 1388 | goto out; |
1da177e4 LT |
1389 | } |
1390 | inode->i_fop = files[i].ops; | |
6174eafc | 1391 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1392 | d_add(dentry, inode); |
1393 | } | |
1394 | out: | |
1395 | return ret; | |
1da177e4 LT |
1396 | } |
1397 | ||
1872981b | 1398 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1399 | size_t count, loff_t *ppos) |
1400 | { | |
1401 | struct inode *inode; | |
1402 | char *con; | |
1403 | u32 sid, len; | |
1404 | ssize_t ret; | |
1405 | ||
1406 | inode = file->f_path.dentry->d_inode; | |
1407 | sid = inode->i_ino&SEL_INO_MASK; | |
1408 | ret = security_sid_to_context(sid, &con, &len); | |
1409 | if (ret < 0) | |
1410 | return ret; | |
1411 | ||
1412 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1413 | kfree(con); | |
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | static const struct file_operations sel_initcon_ops = { | |
1418 | .read = sel_read_initcon, | |
57a62c23 | 1419 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1420 | }; |
1421 | ||
1422 | static int sel_make_initcon_files(struct dentry *dir) | |
1423 | { | |
1424 | int i, ret = 0; | |
1425 | ||
1426 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1427 | struct inode *inode; | |
1428 | struct dentry *dentry; | |
1429 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
1430 | if (!dentry) { | |
1431 | ret = -ENOMEM; | |
1432 | goto out; | |
1433 | } | |
1434 | ||
1435 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1436 | if (!inode) { | |
1437 | ret = -ENOMEM; | |
1438 | goto out; | |
1439 | } | |
1440 | inode->i_fop = &sel_initcon_ops; | |
1441 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1442 | d_add(dentry, inode); | |
1443 | } | |
1444 | out: | |
1445 | return ret; | |
1446 | } | |
1447 | ||
e47c8fc5 CP |
1448 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1449 | { | |
1450 | return a / b - (a % b < 0); | |
1451 | } | |
1452 | ||
1453 | static inline unsigned long sel_class_to_ino(u16 class) | |
1454 | { | |
1455 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1456 | } | |
1457 | ||
1458 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1459 | { | |
1460 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1461 | } | |
1462 | ||
1463 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1464 | { | |
1465 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1466 | } | |
1467 | ||
1468 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1469 | { | |
1470 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1471 | } | |
1472 | ||
1872981b | 1473 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1474 | size_t count, loff_t *ppos) |
1475 | { | |
1476 | ssize_t rc, len; | |
1477 | char *page; | |
1478 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1479 | ||
1480 | page = (char *)__get_free_page(GFP_KERNEL); | |
1481 | if (!page) { | |
1482 | rc = -ENOMEM; | |
1483 | goto out; | |
1484 | } | |
1485 | ||
1486 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1487 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1488 | free_page((unsigned long)page); | |
1489 | out: | |
1490 | return rc; | |
1491 | } | |
1492 | ||
1493 | static const struct file_operations sel_class_ops = { | |
1494 | .read = sel_read_class, | |
57a62c23 | 1495 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1496 | }; |
1497 | ||
1872981b | 1498 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1499 | size_t count, loff_t *ppos) |
1500 | { | |
1501 | ssize_t rc, len; | |
1502 | char *page; | |
1503 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1504 | ||
1505 | page = (char *)__get_free_page(GFP_KERNEL); | |
1506 | if (!page) { | |
1507 | rc = -ENOMEM; | |
1508 | goto out; | |
1509 | } | |
1510 | ||
1872981b | 1511 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); |
e47c8fc5 CP |
1512 | rc = simple_read_from_buffer(buf, count, ppos, page, len); |
1513 | free_page((unsigned long)page); | |
1514 | out: | |
1515 | return rc; | |
1516 | } | |
1517 | ||
1518 | static const struct file_operations sel_perm_ops = { | |
1519 | .read = sel_read_perm, | |
57a62c23 | 1520 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1521 | }; |
1522 | ||
3bb56b25 PM |
1523 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1524 | size_t count, loff_t *ppos) | |
1525 | { | |
1526 | int value; | |
1527 | char tmpbuf[TMPBUFLEN]; | |
1528 | ssize_t length; | |
1529 | unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; | |
1530 | ||
1531 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1532 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1533 | ||
1534 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1535 | } | |
1536 | ||
1537 | static const struct file_operations sel_policycap_ops = { | |
1538 | .read = sel_read_policycap, | |
57a62c23 | 1539 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1540 | }; |
1541 | ||
e47c8fc5 CP |
1542 | static int sel_make_perm_files(char *objclass, int classvalue, |
1543 | struct dentry *dir) | |
1544 | { | |
1545 | int i, rc = 0, nperms; | |
1546 | char **perms; | |
1547 | ||
1548 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1549 | if (rc) | |
1550 | goto out; | |
1551 | ||
1552 | for (i = 0; i < nperms; i++) { | |
1553 | struct inode *inode; | |
1554 | struct dentry *dentry; | |
1555 | ||
1556 | dentry = d_alloc_name(dir, perms[i]); | |
1557 | if (!dentry) { | |
1558 | rc = -ENOMEM; | |
1559 | goto out1; | |
1560 | } | |
1561 | ||
1562 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1563 | if (!inode) { | |
1564 | rc = -ENOMEM; | |
1565 | goto out1; | |
1566 | } | |
1567 | inode->i_fop = &sel_perm_ops; | |
1568 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1569 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1570 | d_add(dentry, inode); |
1571 | } | |
1572 | ||
1573 | out1: | |
1574 | for (i = 0; i < nperms; i++) | |
1575 | kfree(perms[i]); | |
1576 | kfree(perms); | |
1577 | out: | |
1578 | return rc; | |
1579 | } | |
1580 | ||
1581 | static int sel_make_class_dir_entries(char *classname, int index, | |
1582 | struct dentry *dir) | |
1583 | { | |
1584 | struct dentry *dentry = NULL; | |
1585 | struct inode *inode = NULL; | |
1586 | int rc; | |
1587 | ||
1588 | dentry = d_alloc_name(dir, "index"); | |
1589 | if (!dentry) { | |
1590 | rc = -ENOMEM; | |
1591 | goto out; | |
1592 | } | |
1593 | ||
1594 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1595 | if (!inode) { | |
1596 | rc = -ENOMEM; | |
1597 | goto out; | |
1598 | } | |
1599 | ||
1600 | inode->i_fop = &sel_class_ops; | |
1601 | inode->i_ino = sel_class_to_ino(index); | |
1602 | d_add(dentry, inode); | |
1603 | ||
1604 | dentry = d_alloc_name(dir, "perms"); | |
1605 | if (!dentry) { | |
1606 | rc = -ENOMEM; | |
1607 | goto out; | |
1608 | } | |
1609 | ||
1610 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1611 | if (rc) | |
1612 | goto out; | |
1613 | ||
1614 | rc = sel_make_perm_files(classname, index, dentry); | |
1615 | ||
1616 | out: | |
1617 | return rc; | |
1618 | } | |
1619 | ||
1620 | static void sel_remove_classes(void) | |
1621 | { | |
1622 | struct list_head *class_node; | |
1623 | ||
1624 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1625 | struct dentry *class_subdir = list_entry(class_node, | |
1626 | struct dentry, d_u.d_child); | |
1627 | struct list_head *class_subdir_node; | |
1628 | ||
1629 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1630 | struct dentry *d = list_entry(class_subdir_node, | |
1631 | struct dentry, d_u.d_child); | |
1632 | ||
1633 | if (d->d_inode) | |
1634 | if (d->d_inode->i_mode & S_IFDIR) | |
1635 | sel_remove_entries(d); | |
1636 | } | |
1637 | ||
1638 | sel_remove_entries(class_subdir); | |
1639 | } | |
1640 | ||
1641 | sel_remove_entries(class_dir); | |
1642 | } | |
1643 | ||
1644 | static int sel_make_classes(void) | |
1645 | { | |
1646 | int rc = 0, nclasses, i; | |
1647 | char **classes; | |
1648 | ||
1649 | /* delete any existing entries */ | |
1650 | sel_remove_classes(); | |
1651 | ||
1652 | rc = security_get_classes(&classes, &nclasses); | |
1653 | if (rc < 0) | |
1654 | goto out; | |
1655 | ||
1656 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1657 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1658 | |
1659 | for (i = 0; i < nclasses; i++) { | |
1660 | struct dentry *class_name_dir; | |
1661 | ||
1662 | class_name_dir = d_alloc_name(class_dir, classes[i]); | |
1663 | if (!class_name_dir) { | |
1664 | rc = -ENOMEM; | |
1665 | goto out1; | |
1666 | } | |
1667 | ||
1668 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1669 | &last_class_ino); | |
1670 | if (rc) | |
1671 | goto out1; | |
1672 | ||
1673 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1674 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1675 | class_name_dir); |
1676 | if (rc) | |
1677 | goto out1; | |
1678 | } | |
1679 | ||
1680 | out1: | |
1681 | for (i = 0; i < nclasses; i++) | |
1682 | kfree(classes[i]); | |
1683 | kfree(classes); | |
1684 | out: | |
1685 | return rc; | |
1686 | } | |
1687 | ||
3bb56b25 PM |
1688 | static int sel_make_policycap(void) |
1689 | { | |
1690 | unsigned int iter; | |
1691 | struct dentry *dentry = NULL; | |
1692 | struct inode *inode = NULL; | |
1693 | ||
1694 | sel_remove_entries(policycap_dir); | |
1695 | ||
1696 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1697 | if (iter < ARRAY_SIZE(policycap_names)) | |
1698 | dentry = d_alloc_name(policycap_dir, | |
1699 | policycap_names[iter]); | |
1700 | else | |
1701 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1702 | ||
1703 | if (dentry == NULL) | |
1704 | return -ENOMEM; | |
1705 | ||
1706 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1707 | if (inode == NULL) | |
1708 | return -ENOMEM; | |
1709 | ||
1710 | inode->i_fop = &sel_policycap_ops; | |
1711 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1712 | d_add(dentry, inode); | |
1713 | } | |
1714 | ||
1715 | return 0; | |
1716 | } | |
1717 | ||
0dd4ae51 CP |
1718 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1719 | unsigned long *ino) | |
1da177e4 LT |
1720 | { |
1721 | int ret = 0; | |
1722 | struct inode *inode; | |
1723 | ||
edb20fb5 | 1724 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
1da177e4 LT |
1725 | if (!inode) { |
1726 | ret = -ENOMEM; | |
1727 | goto out; | |
1728 | } | |
1729 | inode->i_op = &simple_dir_inode_operations; | |
1730 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1731 | inode->i_ino = ++(*ino); |
40e906f8 | 1732 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1733 | inc_nlink(inode); |
1da177e4 | 1734 | d_add(dentry, inode); |
edb20fb5 | 1735 | /* bump link count on parent directory, too */ |
d8c76e6f | 1736 | inc_nlink(dir); |
1da177e4 LT |
1737 | out: |
1738 | return ret; | |
1739 | } | |
1740 | ||
1872981b | 1741 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1742 | { |
1743 | int ret; | |
1744 | struct dentry *dentry; | |
edb20fb5 | 1745 | struct inode *inode, *root_inode; |
1da177e4 LT |
1746 | struct inode_security_struct *isec; |
1747 | ||
1748 | static struct tree_descr selinux_files[] = { | |
1749 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1750 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1751 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1752 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1753 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1754 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1755 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1756 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1757 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1758 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1759 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1760 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1761 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1762 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1763 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1764 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
cee74f47 | 1765 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, |
1da177e4 LT |
1766 | /* last one */ {""} |
1767 | }; | |
1768 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1769 | if (ret) | |
161ce45a | 1770 | goto err; |
1da177e4 | 1771 | |
edb20fb5 JM |
1772 | root_inode = sb->s_root->d_inode; |
1773 | ||
1da177e4 | 1774 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
161ce45a JM |
1775 | if (!dentry) { |
1776 | ret = -ENOMEM; | |
1777 | goto err; | |
1778 | } | |
1da177e4 | 1779 | |
0dd4ae51 | 1780 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1781 | if (ret) |
161ce45a | 1782 | goto err; |
cde174a8 | 1783 | |
1da177e4 | 1784 | bool_dir = dentry; |
1da177e4 LT |
1785 | |
1786 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
161ce45a JM |
1787 | if (!dentry) { |
1788 | ret = -ENOMEM; | |
1789 | goto err; | |
1790 | } | |
1da177e4 LT |
1791 | |
1792 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
161ce45a JM |
1793 | if (!inode) { |
1794 | ret = -ENOMEM; | |
1795 | goto err; | |
1796 | } | |
6174eafc | 1797 | inode->i_ino = ++sel_last_ino; |
1872981b | 1798 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1799 | isec->sid = SECINITSID_DEVNULL; |
1800 | isec->sclass = SECCLASS_CHR_FILE; | |
1801 | isec->initialized = 1; | |
1802 | ||
1803 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1804 | d_add(dentry, inode); | |
1805 | selinux_null = dentry; | |
1806 | ||
1807 | dentry = d_alloc_name(sb->s_root, "avc"); | |
161ce45a JM |
1808 | if (!dentry) { |
1809 | ret = -ENOMEM; | |
1810 | goto err; | |
1811 | } | |
1da177e4 | 1812 | |
0dd4ae51 | 1813 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1814 | if (ret) |
161ce45a | 1815 | goto err; |
1da177e4 LT |
1816 | |
1817 | ret = sel_make_avc_files(dentry); | |
1818 | if (ret) | |
161ce45a | 1819 | goto err; |
f0ee2e46 JC |
1820 | |
1821 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); | |
1822 | if (!dentry) { | |
1823 | ret = -ENOMEM; | |
1824 | goto err; | |
1825 | } | |
1826 | ||
0dd4ae51 | 1827 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1828 | if (ret) |
1829 | goto err; | |
1830 | ||
1831 | ret = sel_make_initcon_files(dentry); | |
1832 | if (ret) | |
1833 | goto err; | |
1834 | ||
e47c8fc5 CP |
1835 | dentry = d_alloc_name(sb->s_root, "class"); |
1836 | if (!dentry) { | |
1837 | ret = -ENOMEM; | |
1838 | goto err; | |
1839 | } | |
1840 | ||
1841 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1842 | if (ret) | |
1843 | goto err; | |
1844 | ||
1845 | class_dir = dentry; | |
1846 | ||
3bb56b25 PM |
1847 | dentry = d_alloc_name(sb->s_root, "policy_capabilities"); |
1848 | if (!dentry) { | |
1849 | ret = -ENOMEM; | |
1850 | goto err; | |
1851 | } | |
1852 | ||
1853 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1854 | if (ret) | |
1855 | goto err; | |
1856 | ||
1857 | policycap_dir = dentry; | |
1858 | ||
1da177e4 | 1859 | out: |
161ce45a JM |
1860 | return ret; |
1861 | err: | |
744ba35e EP |
1862 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1863 | __func__); | |
161ce45a | 1864 | goto out; |
1da177e4 LT |
1865 | } |
1866 | ||
454e2398 DH |
1867 | static int sel_get_sb(struct file_system_type *fs_type, |
1868 | int flags, const char *dev_name, void *data, | |
1869 | struct vfsmount *mnt) | |
1da177e4 | 1870 | { |
454e2398 | 1871 | return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); |
1da177e4 LT |
1872 | } |
1873 | ||
1874 | static struct file_system_type sel_fs_type = { | |
1875 | .name = "selinuxfs", | |
1876 | .get_sb = sel_get_sb, | |
1877 | .kill_sb = kill_litter_super, | |
1878 | }; | |
1879 | ||
1880 | struct vfsmount *selinuxfs_mount; | |
1881 | ||
1882 | static int __init init_sel_fs(void) | |
1883 | { | |
1884 | int err; | |
1885 | ||
1886 | if (!selinux_enabled) | |
1887 | return 0; | |
1888 | err = register_filesystem(&sel_fs_type); | |
1889 | if (!err) { | |
1890 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1891 | if (IS_ERR(selinuxfs_mount)) { | |
1892 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1893 | err = PTR_ERR(selinuxfs_mount); | |
1894 | selinuxfs_mount = NULL; | |
1895 | } | |
1896 | } | |
1897 | return err; | |
1898 | } | |
1899 | ||
1900 | __initcall(init_sel_fs); | |
1901 | ||
1902 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1903 | void exit_sel_fs(void) | |
1904 | { | |
1905 | unregister_filesystem(&sel_fs_type); | |
1906 | } | |
1907 | #endif |