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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 | ||
108 | if (count < 0 || count >= PAGE_SIZE) | |
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 | ||
158 | if (count < 0 || count >= PAGE_SIZE) | |
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 | ||
245 | if ((count < 0) || (count > 64 * 1024 * 1024) | |
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 | ||
287 | if (count < 0 || count >= PAGE_SIZE) | |
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 | ||
335 | if (count < 0 || count >= PAGE_SIZE) | |
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; | |
427 | scon = kmalloc(size+1, GFP_KERNEL); | |
428 | if (!scon) | |
429 | return length; | |
430 | memset(scon, 0, size+1); | |
431 | ||
432 | tcon = kmalloc(size+1, GFP_KERNEL); | |
433 | if (!tcon) | |
434 | goto out; | |
435 | memset(tcon, 0, size+1); | |
436 | ||
437 | length = -EINVAL; | |
438 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
439 | goto out2; | |
440 | ||
441 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
442 | if (length < 0) | |
443 | goto out2; | |
444 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
445 | if (length < 0) | |
446 | goto out2; | |
447 | ||
448 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
449 | if (length < 0) | |
450 | goto out2; | |
451 | ||
452 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
453 | "%x %x %x %x %u", | |
454 | avd.allowed, avd.decided, | |
455 | avd.auditallow, avd.auditdeny, | |
456 | avd.seqno); | |
457 | out2: | |
458 | kfree(tcon); | |
459 | out: | |
460 | kfree(scon); | |
461 | return length; | |
462 | } | |
463 | ||
464 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
465 | { | |
466 | char *scon, *tcon; | |
467 | u32 ssid, tsid, newsid; | |
468 | u16 tclass; | |
469 | ssize_t length; | |
470 | char *newcon; | |
471 | u32 len; | |
472 | ||
473 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
474 | if (length) | |
475 | return length; | |
476 | ||
477 | length = -ENOMEM; | |
478 | scon = kmalloc(size+1, GFP_KERNEL); | |
479 | if (!scon) | |
480 | return length; | |
481 | memset(scon, 0, size+1); | |
482 | ||
483 | tcon = kmalloc(size+1, GFP_KERNEL); | |
484 | if (!tcon) | |
485 | goto out; | |
486 | memset(tcon, 0, size+1); | |
487 | ||
488 | length = -EINVAL; | |
489 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
490 | goto out2; | |
491 | ||
492 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
493 | if (length < 0) | |
494 | goto out2; | |
495 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
496 | if (length < 0) | |
497 | goto out2; | |
498 | ||
499 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
500 | if (length < 0) | |
501 | goto out2; | |
502 | ||
503 | length = security_sid_to_context(newsid, &newcon, &len); | |
504 | if (length < 0) | |
505 | goto out2; | |
506 | ||
507 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
508 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
509 | "max\n", __FUNCTION__, len); | |
510 | length = -ERANGE; | |
511 | goto out3; | |
512 | } | |
513 | ||
514 | memcpy(buf, newcon, len); | |
515 | length = len; | |
516 | out3: | |
517 | kfree(newcon); | |
518 | out2: | |
519 | kfree(tcon); | |
520 | out: | |
521 | kfree(scon); | |
522 | return length; | |
523 | } | |
524 | ||
525 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
526 | { | |
527 | char *scon, *tcon; | |
528 | u32 ssid, tsid, newsid; | |
529 | u16 tclass; | |
530 | ssize_t length; | |
531 | char *newcon; | |
532 | u32 len; | |
533 | ||
534 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
535 | if (length) | |
536 | return length; | |
537 | ||
538 | length = -ENOMEM; | |
539 | scon = kmalloc(size+1, GFP_KERNEL); | |
540 | if (!scon) | |
541 | return length; | |
542 | memset(scon, 0, size+1); | |
543 | ||
544 | tcon = kmalloc(size+1, GFP_KERNEL); | |
545 | if (!tcon) | |
546 | goto out; | |
547 | memset(tcon, 0, size+1); | |
548 | ||
549 | length = -EINVAL; | |
550 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
551 | goto out2; | |
552 | ||
553 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
554 | if (length < 0) | |
555 | goto out2; | |
556 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
557 | if (length < 0) | |
558 | goto out2; | |
559 | ||
560 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
561 | if (length < 0) | |
562 | goto out2; | |
563 | ||
564 | length = security_sid_to_context(newsid, &newcon, &len); | |
565 | if (length < 0) | |
566 | goto out2; | |
567 | ||
568 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
569 | length = -ERANGE; | |
570 | goto out3; | |
571 | } | |
572 | ||
573 | memcpy(buf, newcon, len); | |
574 | length = len; | |
575 | out3: | |
576 | kfree(newcon); | |
577 | out2: | |
578 | kfree(tcon); | |
579 | out: | |
580 | kfree(scon); | |
581 | return length; | |
582 | } | |
583 | ||
584 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
585 | { | |
586 | char *con, *user, *ptr; | |
587 | u32 sid, *sids; | |
588 | ssize_t length; | |
589 | char *newcon; | |
590 | int i, rc; | |
591 | u32 len, nsids; | |
592 | ||
593 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
594 | if (length) | |
595 | return length; | |
596 | ||
597 | length = -ENOMEM; | |
598 | con = kmalloc(size+1, GFP_KERNEL); | |
599 | if (!con) | |
600 | return length; | |
601 | memset(con, 0, size+1); | |
602 | ||
603 | user = kmalloc(size+1, GFP_KERNEL); | |
604 | if (!user) | |
605 | goto out; | |
606 | memset(user, 0, size+1); | |
607 | ||
608 | length = -EINVAL; | |
609 | if (sscanf(buf, "%s %s", con, user) != 2) | |
610 | goto out2; | |
611 | ||
612 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
613 | if (length < 0) | |
614 | goto out2; | |
615 | ||
616 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
617 | if (length < 0) | |
618 | goto out2; | |
619 | ||
620 | length = sprintf(buf, "%u", nsids) + 1; | |
621 | ptr = buf + length; | |
622 | for (i = 0; i < nsids; i++) { | |
623 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
624 | if (rc) { | |
625 | length = rc; | |
626 | goto out3; | |
627 | } | |
628 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
629 | kfree(newcon); | |
630 | length = -ERANGE; | |
631 | goto out3; | |
632 | } | |
633 | memcpy(ptr, newcon, len); | |
634 | kfree(newcon); | |
635 | ptr += len; | |
636 | length += len; | |
637 | } | |
638 | out3: | |
639 | kfree(sids); | |
640 | out2: | |
641 | kfree(user); | |
642 | out: | |
643 | kfree(con); | |
644 | return length; | |
645 | } | |
646 | ||
647 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
648 | { | |
649 | char *scon, *tcon; | |
650 | u32 ssid, tsid, newsid; | |
651 | u16 tclass; | |
652 | ssize_t length; | |
653 | char *newcon; | |
654 | u32 len; | |
655 | ||
656 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
657 | if (length) | |
658 | return length; | |
659 | ||
660 | length = -ENOMEM; | |
661 | scon = kmalloc(size+1, GFP_KERNEL); | |
662 | if (!scon) | |
663 | return length; | |
664 | memset(scon, 0, size+1); | |
665 | ||
666 | tcon = kmalloc(size+1, GFP_KERNEL); | |
667 | if (!tcon) | |
668 | goto out; | |
669 | memset(tcon, 0, size+1); | |
670 | ||
671 | length = -EINVAL; | |
672 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
673 | goto out2; | |
674 | ||
675 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
676 | if (length < 0) | |
677 | goto out2; | |
678 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
679 | if (length < 0) | |
680 | goto out2; | |
681 | ||
682 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
683 | if (length < 0) | |
684 | goto out2; | |
685 | ||
686 | length = security_sid_to_context(newsid, &newcon, &len); | |
687 | if (length < 0) | |
688 | goto out2; | |
689 | ||
690 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
691 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
692 | "max\n", __FUNCTION__, len); | |
693 | length = -ERANGE; | |
694 | goto out3; | |
695 | } | |
696 | ||
697 | memcpy(buf, newcon, len); | |
698 | length = len; | |
699 | out3: | |
700 | kfree(newcon); | |
701 | out2: | |
702 | kfree(tcon); | |
703 | out: | |
704 | kfree(scon); | |
705 | return length; | |
706 | } | |
707 | ||
708 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
709 | { | |
710 | struct inode *ret = new_inode(sb); | |
711 | ||
712 | if (ret) { | |
713 | ret->i_mode = mode; | |
714 | ret->i_uid = ret->i_gid = 0; | |
715 | ret->i_blksize = PAGE_CACHE_SIZE; | |
716 | ret->i_blocks = 0; | |
717 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
718 | } | |
719 | return ret; | |
720 | } | |
721 | ||
722 | #define BOOL_INO_OFFSET 30 | |
723 | ||
724 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, | |
725 | size_t count, loff_t *ppos) | |
726 | { | |
727 | char *page = NULL; | |
728 | ssize_t length; | |
729 | ssize_t end; | |
730 | ssize_t ret; | |
731 | int cur_enforcing; | |
732 | struct inode *inode; | |
733 | ||
734 | down(&sel_sem); | |
735 | ||
736 | ret = -EFAULT; | |
737 | ||
738 | /* check to see if this file has been deleted */ | |
739 | if (!filep->f_op) | |
740 | goto out; | |
741 | ||
742 | if (count < 0 || count > PAGE_SIZE) { | |
743 | ret = -EINVAL; | |
744 | goto out; | |
745 | } | |
746 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
747 | ret = -ENOMEM; | |
748 | goto out; | |
749 | } | |
750 | ||
751 | inode = filep->f_dentry->d_inode; | |
752 | cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); | |
753 | if (cur_enforcing < 0) { | |
754 | ret = cur_enforcing; | |
755 | goto out; | |
756 | } | |
757 | ||
758 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
759 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); | |
760 | if (length < 0) { | |
761 | ret = length; | |
762 | goto out; | |
763 | } | |
764 | ||
765 | if (*ppos >= length) { | |
766 | ret = 0; | |
767 | goto out; | |
768 | } | |
769 | if (count + *ppos > length) | |
770 | count = length - *ppos; | |
771 | end = count + *ppos; | |
772 | if (copy_to_user(buf, (char *) page + *ppos, count)) { | |
773 | ret = -EFAULT; | |
774 | goto out; | |
775 | } | |
776 | *ppos = end; | |
777 | ret = count; | |
778 | out: | |
779 | up(&sel_sem); | |
780 | if (page) | |
781 | free_page((unsigned long)page); | |
782 | return ret; | |
783 | } | |
784 | ||
785 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
786 | size_t count, loff_t *ppos) | |
787 | { | |
788 | char *page = NULL; | |
789 | ssize_t length = -EFAULT; | |
790 | int new_value; | |
791 | struct inode *inode; | |
792 | ||
793 | down(&sel_sem); | |
794 | ||
795 | length = task_has_security(current, SECURITY__SETBOOL); | |
796 | if (length) | |
797 | goto out; | |
798 | ||
799 | /* check to see if this file has been deleted */ | |
800 | if (!filep->f_op) | |
801 | goto out; | |
802 | ||
803 | if (count < 0 || count >= PAGE_SIZE) { | |
804 | length = -ENOMEM; | |
805 | goto out; | |
806 | } | |
807 | if (*ppos != 0) { | |
808 | /* No partial writes. */ | |
809 | goto out; | |
810 | } | |
811 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
812 | if (!page) { | |
813 | length = -ENOMEM; | |
814 | goto out; | |
815 | } | |
816 | ||
817 | if (copy_from_user(page, buf, count)) | |
818 | goto out; | |
819 | ||
820 | length = -EINVAL; | |
821 | if (sscanf(page, "%d", &new_value) != 1) | |
822 | goto out; | |
823 | ||
824 | if (new_value) | |
825 | new_value = 1; | |
826 | ||
827 | inode = filep->f_dentry->d_inode; | |
828 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; | |
829 | length = count; | |
830 | ||
831 | out: | |
832 | up(&sel_sem); | |
833 | if (page) | |
834 | free_page((unsigned long) page); | |
835 | return length; | |
836 | } | |
837 | ||
838 | static struct file_operations sel_bool_ops = { | |
839 | .read = sel_read_bool, | |
840 | .write = sel_write_bool, | |
841 | }; | |
842 | ||
843 | static ssize_t sel_commit_bools_write(struct file *filep, | |
844 | const char __user *buf, | |
845 | size_t count, loff_t *ppos) | |
846 | { | |
847 | char *page = NULL; | |
848 | ssize_t length = -EFAULT; | |
849 | int new_value; | |
850 | ||
851 | down(&sel_sem); | |
852 | ||
853 | length = task_has_security(current, SECURITY__SETBOOL); | |
854 | if (length) | |
855 | goto out; | |
856 | ||
857 | /* check to see if this file has been deleted */ | |
858 | if (!filep->f_op) | |
859 | goto out; | |
860 | ||
861 | if (count < 0 || count >= PAGE_SIZE) { | |
862 | length = -ENOMEM; | |
863 | goto out; | |
864 | } | |
865 | if (*ppos != 0) { | |
866 | /* No partial writes. */ | |
867 | goto out; | |
868 | } | |
869 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
870 | if (!page) { | |
871 | length = -ENOMEM; | |
872 | goto out; | |
873 | } | |
874 | ||
875 | if (copy_from_user(page, buf, count)) | |
876 | goto out; | |
877 | ||
878 | length = -EINVAL; | |
879 | if (sscanf(page, "%d", &new_value) != 1) | |
880 | goto out; | |
881 | ||
882 | if (new_value) { | |
883 | security_set_bools(bool_num, bool_pending_values); | |
884 | } | |
885 | ||
886 | length = count; | |
887 | ||
888 | out: | |
889 | up(&sel_sem); | |
890 | if (page) | |
891 | free_page((unsigned long) page); | |
892 | return length; | |
893 | } | |
894 | ||
895 | static struct file_operations sel_commit_bools_ops = { | |
896 | .write = sel_commit_bools_write, | |
897 | }; | |
898 | ||
899 | /* delete booleans - partial revoke() from | |
900 | * fs/proc/generic.c proc_kill_inodes */ | |
901 | static void sel_remove_bools(struct dentry *de) | |
902 | { | |
903 | struct list_head *p, *node; | |
904 | struct super_block *sb = de->d_sb; | |
905 | ||
906 | spin_lock(&dcache_lock); | |
907 | node = de->d_subdirs.next; | |
908 | while (node != &de->d_subdirs) { | |
909 | struct dentry *d = list_entry(node, struct dentry, d_child); | |
910 | list_del_init(node); | |
911 | ||
912 | if (d->d_inode) { | |
913 | d = dget_locked(d); | |
914 | spin_unlock(&dcache_lock); | |
915 | d_delete(d); | |
916 | simple_unlink(de->d_inode, d); | |
917 | dput(d); | |
918 | spin_lock(&dcache_lock); | |
919 | } | |
920 | node = de->d_subdirs.next; | |
921 | } | |
922 | ||
923 | spin_unlock(&dcache_lock); | |
924 | ||
925 | file_list_lock(); | |
926 | list_for_each(p, &sb->s_files) { | |
927 | struct file * filp = list_entry(p, struct file, f_list); | |
928 | struct dentry * dentry = filp->f_dentry; | |
929 | ||
930 | if (dentry->d_parent != de) { | |
931 | continue; | |
932 | } | |
933 | filp->f_op = NULL; | |
934 | } | |
935 | file_list_unlock(); | |
936 | } | |
937 | ||
938 | #define BOOL_DIR_NAME "booleans" | |
939 | ||
940 | static int sel_make_bools(void) | |
941 | { | |
942 | int i, ret = 0; | |
943 | ssize_t len; | |
944 | struct dentry *dentry = NULL; | |
945 | struct dentry *dir = bool_dir; | |
946 | struct inode *inode = NULL; | |
947 | struct inode_security_struct *isec; | |
948 | char **names = NULL, *page; | |
949 | int num; | |
950 | int *values = NULL; | |
951 | u32 sid; | |
952 | ||
953 | /* remove any existing files */ | |
9a5f04bf | 954 | kfree(bool_pending_values); |
1da177e4 LT |
955 | |
956 | sel_remove_bools(dir); | |
957 | ||
958 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
959 | return -ENOMEM; | |
960 | ||
961 | ret = security_get_bools(&num, &names, &values); | |
962 | if (ret != 0) | |
963 | goto out; | |
964 | ||
965 | for (i = 0; i < num; i++) { | |
966 | dentry = d_alloc_name(dir, names[i]); | |
967 | if (!dentry) { | |
968 | ret = -ENOMEM; | |
969 | goto err; | |
970 | } | |
971 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
972 | if (!inode) { | |
973 | ret = -ENOMEM; | |
974 | goto err; | |
975 | } | |
976 | ||
977 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
978 | if (len < 0) { | |
979 | ret = -EINVAL; | |
980 | goto err; | |
981 | } else if (len >= PAGE_SIZE) { | |
982 | ret = -ENAMETOOLONG; | |
983 | goto err; | |
984 | } | |
985 | isec = (struct inode_security_struct*)inode->i_security; | |
986 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
987 | goto err; | |
988 | isec->sid = sid; | |
989 | isec->initialized = 1; | |
990 | inode->i_fop = &sel_bool_ops; | |
991 | inode->i_ino = i + BOOL_INO_OFFSET; | |
992 | d_add(dentry, inode); | |
993 | } | |
994 | bool_num = num; | |
995 | bool_pending_values = values; | |
996 | out: | |
997 | free_page((unsigned long)page); | |
998 | if (names) { | |
9a5f04bf JJ |
999 | for (i = 0; i < num; i++) |
1000 | kfree(names[i]); | |
1da177e4 LT |
1001 | kfree(names); |
1002 | } | |
1003 | return ret; | |
1004 | err: | |
1005 | d_genocide(dir); | |
1006 | ret = -ENOMEM; | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | #define NULL_FILE_NAME "null" | |
1011 | ||
1012 | struct dentry *selinux_null = NULL; | |
1013 | ||
1014 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1015 | size_t count, loff_t *ppos) | |
1016 | { | |
1017 | char tmpbuf[TMPBUFLEN]; | |
1018 | ssize_t length; | |
1019 | ||
1020 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1021 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1022 | } | |
1023 | ||
1024 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1025 | const char __user * buf, | |
1026 | size_t count, loff_t *ppos) | |
1027 | ||
1028 | { | |
1029 | char *page; | |
1030 | ssize_t ret; | |
1031 | int new_value; | |
1032 | ||
1033 | if (count < 0 || count >= PAGE_SIZE) { | |
1034 | ret = -ENOMEM; | |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | if (*ppos != 0) { | |
1039 | /* No partial writes. */ | |
1040 | ret = -EINVAL; | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1045 | if (!page) { | |
1046 | ret = -ENOMEM; | |
1047 | goto out; | |
1048 | } | |
1049 | ||
1050 | if (copy_from_user(page, buf, count)) { | |
1051 | ret = -EFAULT; | |
1052 | goto out_free; | |
1053 | } | |
1054 | ||
1055 | if (sscanf(page, "%u", &new_value) != 1) { | |
1056 | ret = -EINVAL; | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | if (new_value != avc_cache_threshold) { | |
1061 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1062 | if (ret) | |
1063 | goto out_free; | |
1064 | avc_cache_threshold = new_value; | |
1065 | } | |
1066 | ret = count; | |
1067 | out_free: | |
1068 | free_page((unsigned long)page); | |
1069 | out: | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1074 | size_t count, loff_t *ppos) | |
1075 | { | |
1076 | char *page; | |
1077 | ssize_t ret = 0; | |
1078 | ||
1079 | page = (char *)__get_free_page(GFP_KERNEL); | |
1080 | if (!page) { | |
1081 | ret = -ENOMEM; | |
1082 | goto out; | |
1083 | } | |
1084 | ret = avc_get_hash_stats(page); | |
1085 | if (ret >= 0) | |
1086 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1087 | free_page((unsigned long)page); | |
1088 | out: | |
1089 | return ret; | |
1090 | } | |
1091 | ||
1092 | static struct file_operations sel_avc_cache_threshold_ops = { | |
1093 | .read = sel_read_avc_cache_threshold, | |
1094 | .write = sel_write_avc_cache_threshold, | |
1095 | }; | |
1096 | ||
1097 | static struct file_operations sel_avc_hash_stats_ops = { | |
1098 | .read = sel_read_avc_hash_stats, | |
1099 | }; | |
1100 | ||
1101 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1102 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1103 | { | |
1104 | int cpu; | |
1105 | ||
1106 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1107 | if (!cpu_possible(cpu)) | |
1108 | continue; | |
1109 | *idx = cpu + 1; | |
1110 | return &per_cpu(avc_cache_stats, cpu); | |
1111 | } | |
1112 | return NULL; | |
1113 | } | |
1114 | ||
1115 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1116 | { | |
1117 | loff_t n = *pos - 1; | |
1118 | ||
1119 | if (*pos == 0) | |
1120 | return SEQ_START_TOKEN; | |
1121 | ||
1122 | return sel_avc_get_stat_idx(&n); | |
1123 | } | |
1124 | ||
1125 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1126 | { | |
1127 | return sel_avc_get_stat_idx(pos); | |
1128 | } | |
1129 | ||
1130 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1131 | { | |
1132 | struct avc_cache_stats *st = v; | |
1133 | ||
1134 | if (v == SEQ_START_TOKEN) | |
1135 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1136 | "frees\n"); | |
1137 | else | |
1138 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1139 | st->hits, st->misses, st->allocations, | |
1140 | st->reclaims, st->frees); | |
1141 | return 0; | |
1142 | } | |
1143 | ||
1144 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1145 | { } | |
1146 | ||
1147 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1148 | .start = sel_avc_stats_seq_start, | |
1149 | .next = sel_avc_stats_seq_next, | |
1150 | .show = sel_avc_stats_seq_show, | |
1151 | .stop = sel_avc_stats_seq_stop, | |
1152 | }; | |
1153 | ||
1154 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1155 | { | |
1156 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1157 | } | |
1158 | ||
1159 | static struct file_operations sel_avc_cache_stats_ops = { | |
1160 | .open = sel_open_avc_cache_stats, | |
1161 | .read = seq_read, | |
1162 | .llseek = seq_lseek, | |
1163 | .release = seq_release, | |
1164 | }; | |
1165 | #endif | |
1166 | ||
1167 | static int sel_make_avc_files(struct dentry *dir) | |
1168 | { | |
1169 | int i, ret = 0; | |
1170 | static struct tree_descr files[] = { | |
1171 | { "cache_threshold", | |
1172 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1173 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1174 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1175 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1176 | #endif | |
1177 | }; | |
1178 | ||
1179 | for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) { | |
1180 | struct inode *inode; | |
1181 | struct dentry *dentry; | |
1182 | ||
1183 | dentry = d_alloc_name(dir, files[i].name); | |
1184 | if (!dentry) { | |
1185 | ret = -ENOMEM; | |
1186 | goto err; | |
1187 | } | |
1188 | ||
1189 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1190 | if (!inode) { | |
1191 | ret = -ENOMEM; | |
1192 | goto err; | |
1193 | } | |
1194 | inode->i_fop = files[i].ops; | |
1195 | d_add(dentry, inode); | |
1196 | } | |
1197 | out: | |
1198 | return ret; | |
1199 | err: | |
1200 | d_genocide(dir); | |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | static int sel_make_dir(struct super_block *sb, struct dentry *dentry) | |
1205 | { | |
1206 | int ret = 0; | |
1207 | struct inode *inode; | |
1208 | ||
1209 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1210 | if (!inode) { | |
1211 | ret = -ENOMEM; | |
1212 | goto out; | |
1213 | } | |
1214 | inode->i_op = &simple_dir_inode_operations; | |
1215 | inode->i_fop = &simple_dir_operations; | |
1216 | d_add(dentry, inode); | |
1217 | out: | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1222 | { | |
1223 | int ret; | |
1224 | struct dentry *dentry; | |
1225 | struct inode *inode; | |
1226 | struct inode_security_struct *isec; | |
1227 | ||
1228 | static struct tree_descr selinux_files[] = { | |
1229 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1230 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
1231 | [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO}, | |
1232 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1233 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1234 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1235 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1236 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1237 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1238 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1239 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1240 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1241 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
1242 | /* last one */ {""} | |
1243 | }; | |
1244 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1245 | if (ret) | |
1246 | return ret; | |
1247 | ||
1248 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); | |
1249 | if (!dentry) | |
1250 | return -ENOMEM; | |
1251 | ||
1252 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1253 | if (!inode) | |
1254 | goto out; | |
1255 | inode->i_op = &simple_dir_inode_operations; | |
1256 | inode->i_fop = &simple_dir_operations; | |
1257 | d_add(dentry, inode); | |
1258 | bool_dir = dentry; | |
1259 | ret = sel_make_bools(); | |
1260 | if (ret) | |
1261 | goto out; | |
1262 | ||
1263 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
1264 | if (!dentry) | |
1265 | return -ENOMEM; | |
1266 | ||
1267 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
1268 | if (!inode) | |
1269 | goto out; | |
1270 | isec = (struct inode_security_struct*)inode->i_security; | |
1271 | isec->sid = SECINITSID_DEVNULL; | |
1272 | isec->sclass = SECCLASS_CHR_FILE; | |
1273 | isec->initialized = 1; | |
1274 | ||
1275 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1276 | d_add(dentry, inode); | |
1277 | selinux_null = dentry; | |
1278 | ||
1279 | dentry = d_alloc_name(sb->s_root, "avc"); | |
1280 | if (!dentry) | |
1281 | return -ENOMEM; | |
1282 | ||
1283 | ret = sel_make_dir(sb, dentry); | |
1284 | if (ret) | |
1285 | goto out; | |
1286 | ||
1287 | ret = sel_make_avc_files(dentry); | |
1288 | if (ret) | |
1289 | goto out; | |
1290 | ||
1291 | return 0; | |
1292 | out: | |
1293 | dput(dentry); | |
1294 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); | |
1295 | return -ENOMEM; | |
1296 | } | |
1297 | ||
1298 | static struct super_block *sel_get_sb(struct file_system_type *fs_type, | |
1299 | int flags, const char *dev_name, void *data) | |
1300 | { | |
1301 | return get_sb_single(fs_type, flags, data, sel_fill_super); | |
1302 | } | |
1303 | ||
1304 | static struct file_system_type sel_fs_type = { | |
1305 | .name = "selinuxfs", | |
1306 | .get_sb = sel_get_sb, | |
1307 | .kill_sb = kill_litter_super, | |
1308 | }; | |
1309 | ||
1310 | struct vfsmount *selinuxfs_mount; | |
1311 | ||
1312 | static int __init init_sel_fs(void) | |
1313 | { | |
1314 | int err; | |
1315 | ||
1316 | if (!selinux_enabled) | |
1317 | return 0; | |
1318 | err = register_filesystem(&sel_fs_type); | |
1319 | if (!err) { | |
1320 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1321 | if (IS_ERR(selinuxfs_mount)) { | |
1322 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1323 | err = PTR_ERR(selinuxfs_mount); | |
1324 | selinuxfs_mount = NULL; | |
1325 | } | |
1326 | } | |
1327 | return err; | |
1328 | } | |
1329 | ||
1330 | __initcall(init_sel_fs); | |
1331 | ||
1332 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1333 | void exit_sel_fs(void) | |
1334 | { | |
1335 | unregister_filesystem(&sel_fs_type); | |
1336 | } | |
1337 | #endif |