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1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
3 | * Added conditional policy language extensions | |
4 | * | |
5 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC | |
6 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, version 2. | |
10 | */ | |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/vmalloc.h> | |
17 | #include <linux/fs.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/security.h> | |
21 | #include <linux/major.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/percpu.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/semaphore.h> | |
26 | ||
27 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
28 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
29 | ||
30 | #include "flask.h" | |
31 | #include "avc.h" | |
32 | #include "avc_ss.h" | |
33 | #include "security.h" | |
34 | #include "objsec.h" | |
35 | #include "conditional.h" | |
36 | ||
37 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; | |
38 | ||
39 | static int __init checkreqprot_setup(char *str) | |
40 | { | |
41 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; | |
42 | return 1; | |
43 | } | |
44 | __setup("checkreqprot=", checkreqprot_setup); | |
45 | ||
46 | ||
47 | static DECLARE_MUTEX(sel_sem); | |
48 | ||
49 | /* global data for booleans */ | |
50 | static struct dentry *bool_dir = NULL; | |
51 | static int bool_num = 0; | |
52 | static int *bool_pending_values = NULL; | |
53 | ||
54 | extern void selnl_notify_setenforce(int val); | |
55 | ||
56 | /* Check whether a task is allowed to use a security operation. */ | |
57 | static int task_has_security(struct task_struct *tsk, | |
58 | u32 perms) | |
59 | { | |
60 | struct task_security_struct *tsec; | |
61 | ||
62 | tsec = tsk->security; | |
63 | if (!tsec) | |
64 | return -EACCES; | |
65 | ||
66 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, | |
67 | SECCLASS_SECURITY, perms, NULL); | |
68 | } | |
69 | ||
70 | enum sel_inos { | |
71 | SEL_ROOT_INO = 2, | |
72 | SEL_LOAD, /* load policy */ | |
73 | SEL_ENFORCE, /* get or set enforcing status */ | |
74 | SEL_CONTEXT, /* validate context */ | |
75 | SEL_ACCESS, /* compute access decision */ | |
76 | SEL_CREATE, /* compute create labeling decision */ | |
77 | SEL_RELABEL, /* compute relabeling decision */ | |
78 | SEL_USER, /* compute reachable user contexts */ | |
79 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
80 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
81 | SEL_MLS, /* return if MLS policy is enabled */ | |
82 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
83 | SEL_AVC, /* AVC management directory */ | |
84 | SEL_MEMBER, /* compute polyinstantiation membership decision */ | |
85 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
86 | }; | |
87 | ||
88 | #define TMPBUFLEN 12 | |
89 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
90 | size_t count, loff_t *ppos) | |
91 | { | |
92 | char tmpbuf[TMPBUFLEN]; | |
93 | ssize_t length; | |
94 | ||
95 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
96 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
97 | } | |
98 | ||
99 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
100 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, | |
101 | size_t count, loff_t *ppos) | |
102 | ||
103 | { | |
104 | char *page; | |
105 | ssize_t length; | |
106 | int new_value; | |
107 | ||
bfd51626 | 108 | if (count >= PAGE_SIZE) |
1da177e4 LT |
109 | return -ENOMEM; |
110 | if (*ppos != 0) { | |
111 | /* No partial writes. */ | |
112 | return -EINVAL; | |
113 | } | |
114 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
115 | if (!page) | |
116 | return -ENOMEM; | |
117 | length = -EFAULT; | |
118 | if (copy_from_user(page, buf, count)) | |
119 | goto out; | |
120 | ||
121 | length = -EINVAL; | |
122 | if (sscanf(page, "%d", &new_value) != 1) | |
123 | goto out; | |
124 | ||
125 | if (new_value != selinux_enforcing) { | |
126 | length = task_has_security(current, SECURITY__SETENFORCE); | |
127 | if (length) | |
128 | goto out; | |
129 | selinux_enforcing = new_value; | |
130 | if (selinux_enforcing) | |
131 | avc_ss_reset(0); | |
132 | selnl_notify_setenforce(selinux_enforcing); | |
133 | } | |
134 | length = count; | |
135 | out: | |
136 | free_page((unsigned long) page); | |
137 | return length; | |
138 | } | |
139 | #else | |
140 | #define sel_write_enforce NULL | |
141 | #endif | |
142 | ||
143 | static struct file_operations sel_enforce_ops = { | |
144 | .read = sel_read_enforce, | |
145 | .write = sel_write_enforce, | |
146 | }; | |
147 | ||
148 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
149 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, | |
150 | size_t count, loff_t *ppos) | |
151 | ||
152 | { | |
153 | char *page; | |
154 | ssize_t length; | |
155 | int new_value; | |
156 | extern int selinux_disable(void); | |
157 | ||
bfd51626 | 158 | if (count >= PAGE_SIZE) |
1da177e4 LT |
159 | return -ENOMEM; |
160 | if (*ppos != 0) { | |
161 | /* No partial writes. */ | |
162 | return -EINVAL; | |
163 | } | |
164 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
165 | if (!page) | |
166 | return -ENOMEM; | |
167 | length = -EFAULT; | |
168 | if (copy_from_user(page, buf, count)) | |
169 | goto out; | |
170 | ||
171 | length = -EINVAL; | |
172 | if (sscanf(page, "%d", &new_value) != 1) | |
173 | goto out; | |
174 | ||
175 | if (new_value) { | |
176 | length = selinux_disable(); | |
177 | if (length < 0) | |
178 | goto out; | |
179 | } | |
180 | ||
181 | length = count; | |
182 | out: | |
183 | free_page((unsigned long) page); | |
184 | return length; | |
185 | } | |
186 | #else | |
187 | #define sel_write_disable NULL | |
188 | #endif | |
189 | ||
190 | static struct file_operations sel_disable_ops = { | |
191 | .write = sel_write_disable, | |
192 | }; | |
193 | ||
194 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
195 | size_t count, loff_t *ppos) | |
196 | { | |
197 | char tmpbuf[TMPBUFLEN]; | |
198 | ssize_t length; | |
199 | ||
200 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
201 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
202 | } | |
203 | ||
204 | static struct file_operations sel_policyvers_ops = { | |
205 | .read = sel_read_policyvers, | |
206 | }; | |
207 | ||
208 | /* declaration for sel_write_load */ | |
209 | static int sel_make_bools(void); | |
210 | ||
211 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
212 | size_t count, loff_t *ppos) | |
213 | { | |
214 | char tmpbuf[TMPBUFLEN]; | |
215 | ssize_t length; | |
216 | ||
217 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); | |
218 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
219 | } | |
220 | ||
221 | static struct file_operations sel_mls_ops = { | |
222 | .read = sel_read_mls, | |
223 | }; | |
224 | ||
225 | static ssize_t sel_write_load(struct file * file, const char __user * buf, | |
226 | size_t count, loff_t *ppos) | |
227 | ||
228 | { | |
229 | int ret; | |
230 | ssize_t length; | |
231 | void *data = NULL; | |
232 | ||
233 | down(&sel_sem); | |
234 | ||
235 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
236 | if (length) | |
237 | goto out; | |
238 | ||
239 | if (*ppos != 0) { | |
240 | /* No partial writes. */ | |
241 | length = -EINVAL; | |
242 | goto out; | |
243 | } | |
244 | ||
bfd51626 | 245 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
246 | || (data = vmalloc(count)) == NULL) { |
247 | length = -ENOMEM; | |
248 | goto out; | |
249 | } | |
250 | ||
251 | length = -EFAULT; | |
252 | if (copy_from_user(data, buf, count) != 0) | |
253 | goto out; | |
254 | ||
255 | length = security_load_policy(data, count); | |
256 | if (length) | |
257 | goto out; | |
258 | ||
259 | ret = sel_make_bools(); | |
260 | if (ret) | |
261 | length = ret; | |
262 | else | |
263 | length = count; | |
264 | out: | |
265 | up(&sel_sem); | |
266 | vfree(data); | |
267 | return length; | |
268 | } | |
269 | ||
270 | static struct file_operations sel_load_ops = { | |
271 | .write = sel_write_load, | |
272 | }; | |
273 | ||
274 | ||
275 | static ssize_t sel_write_context(struct file * file, const char __user * buf, | |
276 | size_t count, loff_t *ppos) | |
277 | ||
278 | { | |
279 | char *page; | |
280 | u32 sid; | |
281 | ssize_t length; | |
282 | ||
283 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
284 | if (length) | |
285 | return length; | |
286 | ||
bfd51626 | 287 | if (count >= PAGE_SIZE) |
1da177e4 LT |
288 | return -ENOMEM; |
289 | if (*ppos != 0) { | |
290 | /* No partial writes. */ | |
291 | return -EINVAL; | |
292 | } | |
293 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
294 | if (!page) | |
295 | return -ENOMEM; | |
296 | length = -EFAULT; | |
297 | if (copy_from_user(page, buf, count)) | |
298 | goto out; | |
299 | ||
300 | length = security_context_to_sid(page, count, &sid); | |
301 | if (length < 0) | |
302 | goto out; | |
303 | ||
304 | length = count; | |
305 | out: | |
306 | free_page((unsigned long) page); | |
307 | return length; | |
308 | } | |
309 | ||
310 | static struct file_operations sel_context_ops = { | |
311 | .write = sel_write_context, | |
312 | }; | |
313 | ||
314 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, | |
315 | size_t count, loff_t *ppos) | |
316 | { | |
317 | char tmpbuf[TMPBUFLEN]; | |
318 | ssize_t length; | |
319 | ||
320 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
321 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
322 | } | |
323 | ||
324 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
325 | size_t count, loff_t *ppos) | |
326 | { | |
327 | char *page; | |
328 | ssize_t length; | |
329 | unsigned int new_value; | |
330 | ||
331 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
332 | if (length) | |
333 | return length; | |
334 | ||
bfd51626 | 335 | if (count >= PAGE_SIZE) |
1da177e4 LT |
336 | return -ENOMEM; |
337 | if (*ppos != 0) { | |
338 | /* No partial writes. */ | |
339 | return -EINVAL; | |
340 | } | |
341 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
342 | if (!page) | |
343 | return -ENOMEM; | |
344 | length = -EFAULT; | |
345 | if (copy_from_user(page, buf, count)) | |
346 | goto out; | |
347 | ||
348 | length = -EINVAL; | |
349 | if (sscanf(page, "%u", &new_value) != 1) | |
350 | goto out; | |
351 | ||
352 | selinux_checkreqprot = new_value ? 1 : 0; | |
353 | length = count; | |
354 | out: | |
355 | free_page((unsigned long) page); | |
356 | return length; | |
357 | } | |
358 | static struct file_operations sel_checkreqprot_ops = { | |
359 | .read = sel_read_checkreqprot, | |
360 | .write = sel_write_checkreqprot, | |
361 | }; | |
362 | ||
363 | /* | |
364 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
365 | */ | |
366 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
367 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
368 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
369 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
370 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
371 | ||
372 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
373 | [SEL_ACCESS] = sel_write_access, | |
374 | [SEL_CREATE] = sel_write_create, | |
375 | [SEL_RELABEL] = sel_write_relabel, | |
376 | [SEL_USER] = sel_write_user, | |
377 | [SEL_MEMBER] = sel_write_member, | |
378 | }; | |
379 | ||
380 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
381 | { | |
382 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
383 | char *data; | |
384 | ssize_t rv; | |
385 | ||
386 | if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino]) | |
387 | return -EINVAL; | |
388 | ||
389 | data = simple_transaction_get(file, buf, size); | |
390 | if (IS_ERR(data)) | |
391 | return PTR_ERR(data); | |
392 | ||
393 | rv = write_op[ino](file, data, size); | |
394 | if (rv>0) { | |
395 | simple_transaction_set(file, rv); | |
396 | rv = size; | |
397 | } | |
398 | return rv; | |
399 | } | |
400 | ||
401 | static struct file_operations transaction_ops = { | |
402 | .write = selinux_transaction_write, | |
403 | .read = simple_transaction_read, | |
404 | .release = simple_transaction_release, | |
405 | }; | |
406 | ||
407 | /* | |
408 | * payload - write methods | |
409 | * If the method has a response, the response should be put in buf, | |
410 | * and the length returned. Otherwise return 0 or and -error. | |
411 | */ | |
412 | ||
413 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
414 | { | |
415 | char *scon, *tcon; | |
416 | u32 ssid, tsid; | |
417 | u16 tclass; | |
418 | u32 req; | |
419 | struct av_decision avd; | |
420 | ssize_t length; | |
421 | ||
422 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
423 | if (length) | |
424 | return length; | |
425 | ||
426 | length = -ENOMEM; | |
89d155ef | 427 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
428 | if (!scon) |
429 | return length; | |
1da177e4 | 430 | |
89d155ef | 431 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
432 | if (!tcon) |
433 | goto out; | |
1da177e4 LT |
434 | |
435 | length = -EINVAL; | |
436 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
437 | goto out2; | |
438 | ||
439 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
440 | if (length < 0) | |
441 | goto out2; | |
442 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
443 | if (length < 0) | |
444 | goto out2; | |
445 | ||
446 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
447 | if (length < 0) | |
448 | goto out2; | |
449 | ||
450 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
451 | "%x %x %x %x %u", | |
452 | avd.allowed, avd.decided, | |
453 | avd.auditallow, avd.auditdeny, | |
454 | avd.seqno); | |
455 | out2: | |
456 | kfree(tcon); | |
457 | out: | |
458 | kfree(scon); | |
459 | return length; | |
460 | } | |
461 | ||
462 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
463 | { | |
464 | char *scon, *tcon; | |
465 | u32 ssid, tsid, newsid; | |
466 | u16 tclass; | |
467 | ssize_t length; | |
468 | char *newcon; | |
469 | u32 len; | |
470 | ||
471 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
472 | if (length) | |
473 | return length; | |
474 | ||
475 | length = -ENOMEM; | |
89d155ef | 476 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
477 | if (!scon) |
478 | return length; | |
1da177e4 | 479 | |
89d155ef | 480 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
481 | if (!tcon) |
482 | goto out; | |
1da177e4 LT |
483 | |
484 | length = -EINVAL; | |
485 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
486 | goto out2; | |
487 | ||
488 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
489 | if (length < 0) | |
490 | goto out2; | |
491 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
492 | if (length < 0) | |
493 | goto out2; | |
494 | ||
495 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
496 | if (length < 0) | |
497 | goto out2; | |
498 | ||
499 | length = security_sid_to_context(newsid, &newcon, &len); | |
500 | if (length < 0) | |
501 | goto out2; | |
502 | ||
503 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
504 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
505 | "max\n", __FUNCTION__, len); | |
506 | length = -ERANGE; | |
507 | goto out3; | |
508 | } | |
509 | ||
510 | memcpy(buf, newcon, len); | |
511 | length = len; | |
512 | out3: | |
513 | kfree(newcon); | |
514 | out2: | |
515 | kfree(tcon); | |
516 | out: | |
517 | kfree(scon); | |
518 | return length; | |
519 | } | |
520 | ||
521 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
522 | { | |
523 | char *scon, *tcon; | |
524 | u32 ssid, tsid, newsid; | |
525 | u16 tclass; | |
526 | ssize_t length; | |
527 | char *newcon; | |
528 | u32 len; | |
529 | ||
530 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
531 | if (length) | |
532 | return length; | |
533 | ||
534 | length = -ENOMEM; | |
89d155ef | 535 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
536 | if (!scon) |
537 | return length; | |
1da177e4 | 538 | |
89d155ef | 539 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
540 | if (!tcon) |
541 | goto out; | |
1da177e4 LT |
542 | |
543 | length = -EINVAL; | |
544 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
545 | goto out2; | |
546 | ||
547 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
548 | if (length < 0) | |
549 | goto out2; | |
550 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
551 | if (length < 0) | |
552 | goto out2; | |
553 | ||
554 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
555 | if (length < 0) | |
556 | goto out2; | |
557 | ||
558 | length = security_sid_to_context(newsid, &newcon, &len); | |
559 | if (length < 0) | |
560 | goto out2; | |
561 | ||
562 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
563 | length = -ERANGE; | |
564 | goto out3; | |
565 | } | |
566 | ||
567 | memcpy(buf, newcon, len); | |
568 | length = len; | |
569 | out3: | |
570 | kfree(newcon); | |
571 | out2: | |
572 | kfree(tcon); | |
573 | out: | |
574 | kfree(scon); | |
575 | return length; | |
576 | } | |
577 | ||
578 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
579 | { | |
580 | char *con, *user, *ptr; | |
581 | u32 sid, *sids; | |
582 | ssize_t length; | |
583 | char *newcon; | |
584 | int i, rc; | |
585 | u32 len, nsids; | |
586 | ||
587 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
588 | if (length) | |
589 | return length; | |
590 | ||
591 | length = -ENOMEM; | |
89d155ef | 592 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
593 | if (!con) |
594 | return length; | |
1da177e4 | 595 | |
89d155ef | 596 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
597 | if (!user) |
598 | goto out; | |
1da177e4 LT |
599 | |
600 | length = -EINVAL; | |
601 | if (sscanf(buf, "%s %s", con, user) != 2) | |
602 | goto out2; | |
603 | ||
604 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
605 | if (length < 0) | |
606 | goto out2; | |
607 | ||
608 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
609 | if (length < 0) | |
610 | goto out2; | |
611 | ||
612 | length = sprintf(buf, "%u", nsids) + 1; | |
613 | ptr = buf + length; | |
614 | for (i = 0; i < nsids; i++) { | |
615 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
616 | if (rc) { | |
617 | length = rc; | |
618 | goto out3; | |
619 | } | |
620 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
621 | kfree(newcon); | |
622 | length = -ERANGE; | |
623 | goto out3; | |
624 | } | |
625 | memcpy(ptr, newcon, len); | |
626 | kfree(newcon); | |
627 | ptr += len; | |
628 | length += len; | |
629 | } | |
630 | out3: | |
631 | kfree(sids); | |
632 | out2: | |
633 | kfree(user); | |
634 | out: | |
635 | kfree(con); | |
636 | return length; | |
637 | } | |
638 | ||
639 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
640 | { | |
641 | char *scon, *tcon; | |
642 | u32 ssid, tsid, newsid; | |
643 | u16 tclass; | |
644 | ssize_t length; | |
645 | char *newcon; | |
646 | u32 len; | |
647 | ||
648 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
649 | if (length) | |
650 | return length; | |
651 | ||
652 | length = -ENOMEM; | |
89d155ef | 653 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
654 | if (!scon) |
655 | return length; | |
1da177e4 | 656 | |
89d155ef | 657 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
658 | if (!tcon) |
659 | goto out; | |
1da177e4 LT |
660 | |
661 | length = -EINVAL; | |
662 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
663 | goto out2; | |
664 | ||
665 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
666 | if (length < 0) | |
667 | goto out2; | |
668 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
669 | if (length < 0) | |
670 | goto out2; | |
671 | ||
672 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
673 | if (length < 0) | |
674 | goto out2; | |
675 | ||
676 | length = security_sid_to_context(newsid, &newcon, &len); | |
677 | if (length < 0) | |
678 | goto out2; | |
679 | ||
680 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
681 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
682 | "max\n", __FUNCTION__, len); | |
683 | length = -ERANGE; | |
684 | goto out3; | |
685 | } | |
686 | ||
687 | memcpy(buf, newcon, len); | |
688 | length = len; | |
689 | out3: | |
690 | kfree(newcon); | |
691 | out2: | |
692 | kfree(tcon); | |
693 | out: | |
694 | kfree(scon); | |
695 | return length; | |
696 | } | |
697 | ||
698 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
699 | { | |
700 | struct inode *ret = new_inode(sb); | |
701 | ||
702 | if (ret) { | |
703 | ret->i_mode = mode; | |
704 | ret->i_uid = ret->i_gid = 0; | |
705 | ret->i_blksize = PAGE_CACHE_SIZE; | |
706 | ret->i_blocks = 0; | |
707 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
708 | } | |
709 | return ret; | |
710 | } | |
711 | ||
712 | #define BOOL_INO_OFFSET 30 | |
713 | ||
714 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, | |
715 | size_t count, loff_t *ppos) | |
716 | { | |
717 | char *page = NULL; | |
718 | ssize_t length; | |
719 | ssize_t end; | |
720 | ssize_t ret; | |
721 | int cur_enforcing; | |
722 | struct inode *inode; | |
723 | ||
724 | down(&sel_sem); | |
725 | ||
726 | ret = -EFAULT; | |
727 | ||
728 | /* check to see if this file has been deleted */ | |
729 | if (!filep->f_op) | |
730 | goto out; | |
731 | ||
bfd51626 | 732 | if (count > PAGE_SIZE) { |
1da177e4 LT |
733 | ret = -EINVAL; |
734 | goto out; | |
735 | } | |
736 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
737 | ret = -ENOMEM; | |
738 | goto out; | |
739 | } | |
740 | ||
741 | inode = filep->f_dentry->d_inode; | |
742 | cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); | |
743 | if (cur_enforcing < 0) { | |
744 | ret = cur_enforcing; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
749 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); | |
750 | if (length < 0) { | |
751 | ret = length; | |
752 | goto out; | |
753 | } | |
754 | ||
755 | if (*ppos >= length) { | |
756 | ret = 0; | |
757 | goto out; | |
758 | } | |
759 | if (count + *ppos > length) | |
760 | count = length - *ppos; | |
761 | end = count + *ppos; | |
762 | if (copy_to_user(buf, (char *) page + *ppos, count)) { | |
763 | ret = -EFAULT; | |
764 | goto out; | |
765 | } | |
766 | *ppos = end; | |
767 | ret = count; | |
768 | out: | |
769 | up(&sel_sem); | |
770 | if (page) | |
771 | free_page((unsigned long)page); | |
772 | return ret; | |
773 | } | |
774 | ||
775 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
776 | size_t count, loff_t *ppos) | |
777 | { | |
778 | char *page = NULL; | |
779 | ssize_t length = -EFAULT; | |
780 | int new_value; | |
781 | struct inode *inode; | |
782 | ||
783 | down(&sel_sem); | |
784 | ||
785 | length = task_has_security(current, SECURITY__SETBOOL); | |
786 | if (length) | |
787 | goto out; | |
788 | ||
789 | /* check to see if this file has been deleted */ | |
790 | if (!filep->f_op) | |
791 | goto out; | |
792 | ||
bfd51626 | 793 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
794 | length = -ENOMEM; |
795 | goto out; | |
796 | } | |
797 | if (*ppos != 0) { | |
798 | /* No partial writes. */ | |
799 | goto out; | |
800 | } | |
801 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
802 | if (!page) { | |
803 | length = -ENOMEM; | |
804 | goto out; | |
805 | } | |
806 | ||
807 | if (copy_from_user(page, buf, count)) | |
808 | goto out; | |
809 | ||
810 | length = -EINVAL; | |
811 | if (sscanf(page, "%d", &new_value) != 1) | |
812 | goto out; | |
813 | ||
814 | if (new_value) | |
815 | new_value = 1; | |
816 | ||
817 | inode = filep->f_dentry->d_inode; | |
818 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; | |
819 | length = count; | |
820 | ||
821 | out: | |
822 | up(&sel_sem); | |
823 | if (page) | |
824 | free_page((unsigned long) page); | |
825 | return length; | |
826 | } | |
827 | ||
828 | static struct file_operations sel_bool_ops = { | |
829 | .read = sel_read_bool, | |
830 | .write = sel_write_bool, | |
831 | }; | |
832 | ||
833 | static ssize_t sel_commit_bools_write(struct file *filep, | |
834 | const char __user *buf, | |
835 | size_t count, loff_t *ppos) | |
836 | { | |
837 | char *page = NULL; | |
838 | ssize_t length = -EFAULT; | |
839 | int new_value; | |
840 | ||
841 | down(&sel_sem); | |
842 | ||
843 | length = task_has_security(current, SECURITY__SETBOOL); | |
844 | if (length) | |
845 | goto out; | |
846 | ||
847 | /* check to see if this file has been deleted */ | |
848 | if (!filep->f_op) | |
849 | goto out; | |
850 | ||
bfd51626 | 851 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
852 | length = -ENOMEM; |
853 | goto out; | |
854 | } | |
855 | if (*ppos != 0) { | |
856 | /* No partial writes. */ | |
857 | goto out; | |
858 | } | |
859 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
860 | if (!page) { | |
861 | length = -ENOMEM; | |
862 | goto out; | |
863 | } | |
864 | ||
865 | if (copy_from_user(page, buf, count)) | |
866 | goto out; | |
867 | ||
868 | length = -EINVAL; | |
869 | if (sscanf(page, "%d", &new_value) != 1) | |
870 | goto out; | |
871 | ||
20c19e41 | 872 | if (new_value && bool_pending_values) { |
1da177e4 LT |
873 | security_set_bools(bool_num, bool_pending_values); |
874 | } | |
875 | ||
876 | length = count; | |
877 | ||
878 | out: | |
879 | up(&sel_sem); | |
880 | if (page) | |
881 | free_page((unsigned long) page); | |
882 | return length; | |
883 | } | |
884 | ||
885 | static struct file_operations sel_commit_bools_ops = { | |
886 | .write = sel_commit_bools_write, | |
887 | }; | |
888 | ||
889 | /* delete booleans - partial revoke() from | |
890 | * fs/proc/generic.c proc_kill_inodes */ | |
891 | static void sel_remove_bools(struct dentry *de) | |
892 | { | |
893 | struct list_head *p, *node; | |
894 | struct super_block *sb = de->d_sb; | |
895 | ||
896 | spin_lock(&dcache_lock); | |
897 | node = de->d_subdirs.next; | |
898 | while (node != &de->d_subdirs) { | |
899 | struct dentry *d = list_entry(node, struct dentry, d_child); | |
900 | list_del_init(node); | |
901 | ||
902 | if (d->d_inode) { | |
903 | d = dget_locked(d); | |
904 | spin_unlock(&dcache_lock); | |
905 | d_delete(d); | |
906 | simple_unlink(de->d_inode, d); | |
907 | dput(d); | |
908 | spin_lock(&dcache_lock); | |
909 | } | |
910 | node = de->d_subdirs.next; | |
911 | } | |
912 | ||
913 | spin_unlock(&dcache_lock); | |
914 | ||
915 | file_list_lock(); | |
916 | list_for_each(p, &sb->s_files) { | |
2f512016 | 917 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
1da177e4 LT |
918 | struct dentry * dentry = filp->f_dentry; |
919 | ||
920 | if (dentry->d_parent != de) { | |
921 | continue; | |
922 | } | |
923 | filp->f_op = NULL; | |
924 | } | |
925 | file_list_unlock(); | |
926 | } | |
927 | ||
928 | #define BOOL_DIR_NAME "booleans" | |
929 | ||
930 | static int sel_make_bools(void) | |
931 | { | |
932 | int i, ret = 0; | |
933 | ssize_t len; | |
934 | struct dentry *dentry = NULL; | |
935 | struct dentry *dir = bool_dir; | |
936 | struct inode *inode = NULL; | |
937 | struct inode_security_struct *isec; | |
938 | char **names = NULL, *page; | |
939 | int num; | |
940 | int *values = NULL; | |
941 | u32 sid; | |
942 | ||
943 | /* remove any existing files */ | |
9a5f04bf | 944 | kfree(bool_pending_values); |
20c19e41 | 945 | bool_pending_values = NULL; |
1da177e4 LT |
946 | |
947 | sel_remove_bools(dir); | |
948 | ||
949 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
950 | return -ENOMEM; | |
951 | ||
952 | ret = security_get_bools(&num, &names, &values); | |
953 | if (ret != 0) | |
954 | goto out; | |
955 | ||
956 | for (i = 0; i < num; i++) { | |
957 | dentry = d_alloc_name(dir, names[i]); | |
958 | if (!dentry) { | |
959 | ret = -ENOMEM; | |
960 | goto err; | |
961 | } | |
962 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
963 | if (!inode) { | |
964 | ret = -ENOMEM; | |
965 | goto err; | |
966 | } | |
967 | ||
968 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
969 | if (len < 0) { | |
970 | ret = -EINVAL; | |
971 | goto err; | |
972 | } else if (len >= PAGE_SIZE) { | |
973 | ret = -ENAMETOOLONG; | |
974 | goto err; | |
975 | } | |
976 | isec = (struct inode_security_struct*)inode->i_security; | |
977 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
978 | goto err; | |
979 | isec->sid = sid; | |
980 | isec->initialized = 1; | |
981 | inode->i_fop = &sel_bool_ops; | |
982 | inode->i_ino = i + BOOL_INO_OFFSET; | |
983 | d_add(dentry, inode); | |
984 | } | |
985 | bool_num = num; | |
986 | bool_pending_values = values; | |
987 | out: | |
988 | free_page((unsigned long)page); | |
989 | if (names) { | |
9a5f04bf JJ |
990 | for (i = 0; i < num; i++) |
991 | kfree(names[i]); | |
1da177e4 LT |
992 | kfree(names); |
993 | } | |
994 | return ret; | |
995 | err: | |
20c19e41 | 996 | kfree(values); |
1da177e4 LT |
997 | d_genocide(dir); |
998 | ret = -ENOMEM; | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | #define NULL_FILE_NAME "null" | |
1003 | ||
1004 | struct dentry *selinux_null = NULL; | |
1005 | ||
1006 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1007 | size_t count, loff_t *ppos) | |
1008 | { | |
1009 | char tmpbuf[TMPBUFLEN]; | |
1010 | ssize_t length; | |
1011 | ||
1012 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1013 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1014 | } | |
1015 | ||
1016 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1017 | const char __user * buf, | |
1018 | size_t count, loff_t *ppos) | |
1019 | ||
1020 | { | |
1021 | char *page; | |
1022 | ssize_t ret; | |
1023 | int new_value; | |
1024 | ||
bfd51626 | 1025 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1026 | ret = -ENOMEM; |
1027 | goto out; | |
1028 | } | |
1029 | ||
1030 | if (*ppos != 0) { | |
1031 | /* No partial writes. */ | |
1032 | ret = -EINVAL; | |
1033 | goto out; | |
1034 | } | |
1035 | ||
1036 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1037 | if (!page) { | |
1038 | ret = -ENOMEM; | |
1039 | goto out; | |
1040 | } | |
1041 | ||
1042 | if (copy_from_user(page, buf, count)) { | |
1043 | ret = -EFAULT; | |
1044 | goto out_free; | |
1045 | } | |
1046 | ||
1047 | if (sscanf(page, "%u", &new_value) != 1) { | |
1048 | ret = -EINVAL; | |
1049 | goto out; | |
1050 | } | |
1051 | ||
1052 | if (new_value != avc_cache_threshold) { | |
1053 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1054 | if (ret) | |
1055 | goto out_free; | |
1056 | avc_cache_threshold = new_value; | |
1057 | } | |
1058 | ret = count; | |
1059 | out_free: | |
1060 | free_page((unsigned long)page); | |
1061 | out: | |
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1066 | size_t count, loff_t *ppos) | |
1067 | { | |
1068 | char *page; | |
1069 | ssize_t ret = 0; | |
1070 | ||
1071 | page = (char *)__get_free_page(GFP_KERNEL); | |
1072 | if (!page) { | |
1073 | ret = -ENOMEM; | |
1074 | goto out; | |
1075 | } | |
1076 | ret = avc_get_hash_stats(page); | |
1077 | if (ret >= 0) | |
1078 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1079 | free_page((unsigned long)page); | |
1080 | out: | |
1081 | return ret; | |
1082 | } | |
1083 | ||
1084 | static struct file_operations sel_avc_cache_threshold_ops = { | |
1085 | .read = sel_read_avc_cache_threshold, | |
1086 | .write = sel_write_avc_cache_threshold, | |
1087 | }; | |
1088 | ||
1089 | static struct file_operations sel_avc_hash_stats_ops = { | |
1090 | .read = sel_read_avc_hash_stats, | |
1091 | }; | |
1092 | ||
1093 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1094 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1095 | { | |
1096 | int cpu; | |
1097 | ||
1098 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1099 | if (!cpu_possible(cpu)) | |
1100 | continue; | |
1101 | *idx = cpu + 1; | |
1102 | return &per_cpu(avc_cache_stats, cpu); | |
1103 | } | |
1104 | return NULL; | |
1105 | } | |
1106 | ||
1107 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1108 | { | |
1109 | loff_t n = *pos - 1; | |
1110 | ||
1111 | if (*pos == 0) | |
1112 | return SEQ_START_TOKEN; | |
1113 | ||
1114 | return sel_avc_get_stat_idx(&n); | |
1115 | } | |
1116 | ||
1117 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1118 | { | |
1119 | return sel_avc_get_stat_idx(pos); | |
1120 | } | |
1121 | ||
1122 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1123 | { | |
1124 | struct avc_cache_stats *st = v; | |
1125 | ||
1126 | if (v == SEQ_START_TOKEN) | |
1127 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1128 | "frees\n"); | |
1129 | else | |
1130 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1131 | st->hits, st->misses, st->allocations, | |
1132 | st->reclaims, st->frees); | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1137 | { } | |
1138 | ||
1139 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1140 | .start = sel_avc_stats_seq_start, | |
1141 | .next = sel_avc_stats_seq_next, | |
1142 | .show = sel_avc_stats_seq_show, | |
1143 | .stop = sel_avc_stats_seq_stop, | |
1144 | }; | |
1145 | ||
1146 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1147 | { | |
1148 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1149 | } | |
1150 | ||
1151 | static struct file_operations sel_avc_cache_stats_ops = { | |
1152 | .open = sel_open_avc_cache_stats, | |
1153 | .read = seq_read, | |
1154 | .llseek = seq_lseek, | |
1155 | .release = seq_release, | |
1156 | }; | |
1157 | #endif | |
1158 | ||
1159 | static int sel_make_avc_files(struct dentry *dir) | |
1160 | { | |
1161 | int i, ret = 0; | |
1162 | static struct tree_descr files[] = { | |
1163 | { "cache_threshold", | |
1164 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1165 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1166 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1167 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1168 | #endif | |
1169 | }; | |
1170 | ||
1171 | for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) { | |
1172 | struct inode *inode; | |
1173 | struct dentry *dentry; | |
1174 | ||
1175 | dentry = d_alloc_name(dir, files[i].name); | |
1176 | if (!dentry) { | |
1177 | ret = -ENOMEM; | |
1178 | goto err; | |
1179 | } | |
1180 | ||
1181 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1182 | if (!inode) { | |
1183 | ret = -ENOMEM; | |
1184 | goto err; | |
1185 | } | |
1186 | inode->i_fop = files[i].ops; | |
1187 | d_add(dentry, inode); | |
1188 | } | |
1189 | out: | |
1190 | return ret; | |
1191 | err: | |
1192 | d_genocide(dir); | |
1193 | goto out; | |
1194 | } | |
1195 | ||
1196 | static int sel_make_dir(struct super_block *sb, struct dentry *dentry) | |
1197 | { | |
1198 | int ret = 0; | |
1199 | struct inode *inode; | |
1200 | ||
1201 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1202 | if (!inode) { | |
1203 | ret = -ENOMEM; | |
1204 | goto out; | |
1205 | } | |
1206 | inode->i_op = &simple_dir_inode_operations; | |
1207 | inode->i_fop = &simple_dir_operations; | |
1208 | d_add(dentry, inode); | |
1209 | out: | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1214 | { | |
1215 | int ret; | |
1216 | struct dentry *dentry; | |
1217 | struct inode *inode; | |
1218 | struct inode_security_struct *isec; | |
1219 | ||
1220 | static struct tree_descr selinux_files[] = { | |
1221 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1222 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
1223 | [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO}, | |
1224 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1225 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1226 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1227 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1228 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1229 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1230 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1231 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1232 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1233 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
1234 | /* last one */ {""} | |
1235 | }; | |
1236 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1237 | if (ret) | |
1238 | return ret; | |
1239 | ||
1240 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); | |
1241 | if (!dentry) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1245 | if (!inode) | |
1246 | goto out; | |
1247 | inode->i_op = &simple_dir_inode_operations; | |
1248 | inode->i_fop = &simple_dir_operations; | |
1249 | d_add(dentry, inode); | |
1250 | bool_dir = dentry; | |
1251 | ret = sel_make_bools(); | |
1252 | if (ret) | |
1253 | goto out; | |
1254 | ||
1255 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
1256 | if (!dentry) | |
1257 | return -ENOMEM; | |
1258 | ||
1259 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
1260 | if (!inode) | |
1261 | goto out; | |
1262 | isec = (struct inode_security_struct*)inode->i_security; | |
1263 | isec->sid = SECINITSID_DEVNULL; | |
1264 | isec->sclass = SECCLASS_CHR_FILE; | |
1265 | isec->initialized = 1; | |
1266 | ||
1267 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1268 | d_add(dentry, inode); | |
1269 | selinux_null = dentry; | |
1270 | ||
1271 | dentry = d_alloc_name(sb->s_root, "avc"); | |
1272 | if (!dentry) | |
1273 | return -ENOMEM; | |
1274 | ||
1275 | ret = sel_make_dir(sb, dentry); | |
1276 | if (ret) | |
1277 | goto out; | |
1278 | ||
1279 | ret = sel_make_avc_files(dentry); | |
1280 | if (ret) | |
1281 | goto out; | |
1282 | ||
1283 | return 0; | |
1284 | out: | |
1285 | dput(dentry); | |
1286 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); | |
1287 | return -ENOMEM; | |
1288 | } | |
1289 | ||
1290 | static struct super_block *sel_get_sb(struct file_system_type *fs_type, | |
1291 | int flags, const char *dev_name, void *data) | |
1292 | { | |
1293 | return get_sb_single(fs_type, flags, data, sel_fill_super); | |
1294 | } | |
1295 | ||
1296 | static struct file_system_type sel_fs_type = { | |
1297 | .name = "selinuxfs", | |
1298 | .get_sb = sel_get_sb, | |
1299 | .kill_sb = kill_litter_super, | |
1300 | }; | |
1301 | ||
1302 | struct vfsmount *selinuxfs_mount; | |
1303 | ||
1304 | static int __init init_sel_fs(void) | |
1305 | { | |
1306 | int err; | |
1307 | ||
1308 | if (!selinux_enabled) | |
1309 | return 0; | |
1310 | err = register_filesystem(&sel_fs_type); | |
1311 | if (!err) { | |
1312 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1313 | if (IS_ERR(selinuxfs_mount)) { | |
1314 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1315 | err = PTR_ERR(selinuxfs_mount); | |
1316 | selinuxfs_mount = NULL; | |
1317 | } | |
1318 | } | |
1319 | return err; | |
1320 | } | |
1321 | ||
1322 | __initcall(init_sel_fs); | |
1323 | ||
1324 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1325 | void exit_sel_fs(void) | |
1326 | { | |
1327 | unregister_filesystem(&sel_fs_type); | |
1328 | } | |
1329 | #endif |