Commit | Line | Data |
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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 | ||
ce9982d0 | 274 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
1da177e4 | 275 | { |
ce9982d0 SS |
276 | char *canon; |
277 | u32 sid, len; | |
1da177e4 LT |
278 | ssize_t length; |
279 | ||
280 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
281 | if (length) | |
282 | return length; | |
283 | ||
ce9982d0 SS |
284 | length = security_context_to_sid(buf, size, &sid); |
285 | if (length < 0) | |
286 | return length; | |
1da177e4 | 287 | |
ce9982d0 | 288 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 289 | if (length < 0) |
ce9982d0 SS |
290 | return length; |
291 | ||
292 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
293 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
294 | "max\n", __FUNCTION__, len); | |
295 | length = -ERANGE; | |
1da177e4 | 296 | goto out; |
ce9982d0 | 297 | } |
1da177e4 | 298 | |
ce9982d0 SS |
299 | memcpy(buf, canon, len); |
300 | length = len; | |
1da177e4 | 301 | out: |
ce9982d0 | 302 | kfree(canon); |
1da177e4 LT |
303 | return length; |
304 | } | |
305 | ||
1da177e4 LT |
306 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
307 | size_t count, loff_t *ppos) | |
308 | { | |
309 | char tmpbuf[TMPBUFLEN]; | |
310 | ssize_t length; | |
311 | ||
312 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
313 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
314 | } | |
315 | ||
316 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
317 | size_t count, loff_t *ppos) | |
318 | { | |
319 | char *page; | |
320 | ssize_t length; | |
321 | unsigned int new_value; | |
322 | ||
323 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
324 | if (length) | |
325 | return length; | |
326 | ||
bfd51626 | 327 | if (count >= PAGE_SIZE) |
1da177e4 LT |
328 | return -ENOMEM; |
329 | if (*ppos != 0) { | |
330 | /* No partial writes. */ | |
331 | return -EINVAL; | |
332 | } | |
333 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
334 | if (!page) | |
335 | return -ENOMEM; | |
336 | length = -EFAULT; | |
337 | if (copy_from_user(page, buf, count)) | |
338 | goto out; | |
339 | ||
340 | length = -EINVAL; | |
341 | if (sscanf(page, "%u", &new_value) != 1) | |
342 | goto out; | |
343 | ||
344 | selinux_checkreqprot = new_value ? 1 : 0; | |
345 | length = count; | |
346 | out: | |
347 | free_page((unsigned long) page); | |
348 | return length; | |
349 | } | |
350 | static struct file_operations sel_checkreqprot_ops = { | |
351 | .read = sel_read_checkreqprot, | |
352 | .write = sel_write_checkreqprot, | |
353 | }; | |
354 | ||
355 | /* | |
356 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
357 | */ | |
358 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
359 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
360 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
361 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
362 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
363 | ||
364 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
365 | [SEL_ACCESS] = sel_write_access, | |
366 | [SEL_CREATE] = sel_write_create, | |
367 | [SEL_RELABEL] = sel_write_relabel, | |
368 | [SEL_USER] = sel_write_user, | |
369 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 370 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
371 | }; |
372 | ||
373 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
374 | { | |
375 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
376 | char *data; | |
377 | ssize_t rv; | |
378 | ||
6e20a64a | 379 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
380 | return -EINVAL; |
381 | ||
382 | data = simple_transaction_get(file, buf, size); | |
383 | if (IS_ERR(data)) | |
384 | return PTR_ERR(data); | |
385 | ||
386 | rv = write_op[ino](file, data, size); | |
387 | if (rv>0) { | |
388 | simple_transaction_set(file, rv); | |
389 | rv = size; | |
390 | } | |
391 | return rv; | |
392 | } | |
393 | ||
394 | static struct file_operations transaction_ops = { | |
395 | .write = selinux_transaction_write, | |
396 | .read = simple_transaction_read, | |
397 | .release = simple_transaction_release, | |
398 | }; | |
399 | ||
400 | /* | |
401 | * payload - write methods | |
402 | * If the method has a response, the response should be put in buf, | |
403 | * and the length returned. Otherwise return 0 or and -error. | |
404 | */ | |
405 | ||
406 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
407 | { | |
408 | char *scon, *tcon; | |
409 | u32 ssid, tsid; | |
410 | u16 tclass; | |
411 | u32 req; | |
412 | struct av_decision avd; | |
413 | ssize_t length; | |
414 | ||
415 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
416 | if (length) | |
417 | return length; | |
418 | ||
419 | length = -ENOMEM; | |
89d155ef | 420 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
421 | if (!scon) |
422 | return length; | |
1da177e4 | 423 | |
89d155ef | 424 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
425 | if (!tcon) |
426 | goto out; | |
1da177e4 LT |
427 | |
428 | length = -EINVAL; | |
429 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
430 | goto out2; | |
431 | ||
432 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
433 | if (length < 0) | |
434 | goto out2; | |
435 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
436 | if (length < 0) | |
437 | goto out2; | |
438 | ||
439 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
440 | if (length < 0) | |
441 | goto out2; | |
442 | ||
443 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
444 | "%x %x %x %x %u", | |
445 | avd.allowed, avd.decided, | |
446 | avd.auditallow, avd.auditdeny, | |
447 | avd.seqno); | |
448 | out2: | |
449 | kfree(tcon); | |
450 | out: | |
451 | kfree(scon); | |
452 | return length; | |
453 | } | |
454 | ||
455 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
456 | { | |
457 | char *scon, *tcon; | |
458 | u32 ssid, tsid, newsid; | |
459 | u16 tclass; | |
460 | ssize_t length; | |
461 | char *newcon; | |
462 | u32 len; | |
463 | ||
464 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
465 | if (length) | |
466 | return length; | |
467 | ||
468 | length = -ENOMEM; | |
89d155ef | 469 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
470 | if (!scon) |
471 | return length; | |
1da177e4 | 472 | |
89d155ef | 473 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
474 | if (!tcon) |
475 | goto out; | |
1da177e4 LT |
476 | |
477 | length = -EINVAL; | |
478 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
479 | goto out2; | |
480 | ||
481 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
482 | if (length < 0) | |
483 | goto out2; | |
484 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
485 | if (length < 0) | |
486 | goto out2; | |
487 | ||
488 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
489 | if (length < 0) | |
490 | goto out2; | |
491 | ||
492 | length = security_sid_to_context(newsid, &newcon, &len); | |
493 | if (length < 0) | |
494 | goto out2; | |
495 | ||
496 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
497 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
498 | "max\n", __FUNCTION__, len); | |
499 | length = -ERANGE; | |
500 | goto out3; | |
501 | } | |
502 | ||
503 | memcpy(buf, newcon, len); | |
504 | length = len; | |
505 | out3: | |
506 | kfree(newcon); | |
507 | out2: | |
508 | kfree(tcon); | |
509 | out: | |
510 | kfree(scon); | |
511 | return length; | |
512 | } | |
513 | ||
514 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
515 | { | |
516 | char *scon, *tcon; | |
517 | u32 ssid, tsid, newsid; | |
518 | u16 tclass; | |
519 | ssize_t length; | |
520 | char *newcon; | |
521 | u32 len; | |
522 | ||
523 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
524 | if (length) | |
525 | return length; | |
526 | ||
527 | length = -ENOMEM; | |
89d155ef | 528 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
529 | if (!scon) |
530 | return length; | |
1da177e4 | 531 | |
89d155ef | 532 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
533 | if (!tcon) |
534 | goto out; | |
1da177e4 LT |
535 | |
536 | length = -EINVAL; | |
537 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
538 | goto out2; | |
539 | ||
540 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
541 | if (length < 0) | |
542 | goto out2; | |
543 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
544 | if (length < 0) | |
545 | goto out2; | |
546 | ||
547 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
548 | if (length < 0) | |
549 | goto out2; | |
550 | ||
551 | length = security_sid_to_context(newsid, &newcon, &len); | |
552 | if (length < 0) | |
553 | goto out2; | |
554 | ||
555 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
556 | length = -ERANGE; | |
557 | goto out3; | |
558 | } | |
559 | ||
560 | memcpy(buf, newcon, len); | |
561 | length = len; | |
562 | out3: | |
563 | kfree(newcon); | |
564 | out2: | |
565 | kfree(tcon); | |
566 | out: | |
567 | kfree(scon); | |
568 | return length; | |
569 | } | |
570 | ||
571 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
572 | { | |
573 | char *con, *user, *ptr; | |
574 | u32 sid, *sids; | |
575 | ssize_t length; | |
576 | char *newcon; | |
577 | int i, rc; | |
578 | u32 len, nsids; | |
579 | ||
580 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
581 | if (length) | |
582 | return length; | |
583 | ||
584 | length = -ENOMEM; | |
89d155ef | 585 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
586 | if (!con) |
587 | return length; | |
1da177e4 | 588 | |
89d155ef | 589 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
590 | if (!user) |
591 | goto out; | |
1da177e4 LT |
592 | |
593 | length = -EINVAL; | |
594 | if (sscanf(buf, "%s %s", con, user) != 2) | |
595 | goto out2; | |
596 | ||
597 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
598 | if (length < 0) | |
599 | goto out2; | |
600 | ||
601 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
602 | if (length < 0) | |
603 | goto out2; | |
604 | ||
605 | length = sprintf(buf, "%u", nsids) + 1; | |
606 | ptr = buf + length; | |
607 | for (i = 0; i < nsids; i++) { | |
608 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
609 | if (rc) { | |
610 | length = rc; | |
611 | goto out3; | |
612 | } | |
613 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
614 | kfree(newcon); | |
615 | length = -ERANGE; | |
616 | goto out3; | |
617 | } | |
618 | memcpy(ptr, newcon, len); | |
619 | kfree(newcon); | |
620 | ptr += len; | |
621 | length += len; | |
622 | } | |
623 | out3: | |
624 | kfree(sids); | |
625 | out2: | |
626 | kfree(user); | |
627 | out: | |
628 | kfree(con); | |
629 | return length; | |
630 | } | |
631 | ||
632 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
633 | { | |
634 | char *scon, *tcon; | |
635 | u32 ssid, tsid, newsid; | |
636 | u16 tclass; | |
637 | ssize_t length; | |
638 | char *newcon; | |
639 | u32 len; | |
640 | ||
641 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
642 | if (length) | |
643 | return length; | |
644 | ||
645 | length = -ENOMEM; | |
89d155ef | 646 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
647 | if (!scon) |
648 | return length; | |
1da177e4 | 649 | |
89d155ef | 650 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
651 | if (!tcon) |
652 | goto out; | |
1da177e4 LT |
653 | |
654 | length = -EINVAL; | |
655 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
656 | goto out2; | |
657 | ||
658 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
659 | if (length < 0) | |
660 | goto out2; | |
661 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
662 | if (length < 0) | |
663 | goto out2; | |
664 | ||
665 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
666 | if (length < 0) | |
667 | goto out2; | |
668 | ||
669 | length = security_sid_to_context(newsid, &newcon, &len); | |
670 | if (length < 0) | |
671 | goto out2; | |
672 | ||
673 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
674 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
675 | "max\n", __FUNCTION__, len); | |
676 | length = -ERANGE; | |
677 | goto out3; | |
678 | } | |
679 | ||
680 | memcpy(buf, newcon, len); | |
681 | length = len; | |
682 | out3: | |
683 | kfree(newcon); | |
684 | out2: | |
685 | kfree(tcon); | |
686 | out: | |
687 | kfree(scon); | |
688 | return length; | |
689 | } | |
690 | ||
691 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
692 | { | |
693 | struct inode *ret = new_inode(sb); | |
694 | ||
695 | if (ret) { | |
696 | ret->i_mode = mode; | |
697 | ret->i_uid = ret->i_gid = 0; | |
698 | ret->i_blksize = PAGE_CACHE_SIZE; | |
699 | ret->i_blocks = 0; | |
700 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
701 | } | |
702 | return ret; | |
703 | } | |
704 | ||
705 | #define BOOL_INO_OFFSET 30 | |
706 | ||
707 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, | |
708 | size_t count, loff_t *ppos) | |
709 | { | |
710 | char *page = NULL; | |
711 | ssize_t length; | |
712 | ssize_t end; | |
713 | ssize_t ret; | |
714 | int cur_enforcing; | |
715 | struct inode *inode; | |
716 | ||
717 | down(&sel_sem); | |
718 | ||
719 | ret = -EFAULT; | |
720 | ||
721 | /* check to see if this file has been deleted */ | |
722 | if (!filep->f_op) | |
723 | goto out; | |
724 | ||
bfd51626 | 725 | if (count > PAGE_SIZE) { |
1da177e4 LT |
726 | ret = -EINVAL; |
727 | goto out; | |
728 | } | |
729 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
730 | ret = -ENOMEM; | |
731 | goto out; | |
732 | } | |
733 | ||
734 | inode = filep->f_dentry->d_inode; | |
735 | cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); | |
736 | if (cur_enforcing < 0) { | |
737 | ret = cur_enforcing; | |
738 | goto out; | |
739 | } | |
740 | ||
741 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
742 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); | |
743 | if (length < 0) { | |
744 | ret = length; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | if (*ppos >= length) { | |
749 | ret = 0; | |
750 | goto out; | |
751 | } | |
752 | if (count + *ppos > length) | |
753 | count = length - *ppos; | |
754 | end = count + *ppos; | |
755 | if (copy_to_user(buf, (char *) page + *ppos, count)) { | |
756 | ret = -EFAULT; | |
757 | goto out; | |
758 | } | |
759 | *ppos = end; | |
760 | ret = count; | |
761 | out: | |
762 | up(&sel_sem); | |
763 | if (page) | |
764 | free_page((unsigned long)page); | |
765 | return ret; | |
766 | } | |
767 | ||
768 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
769 | size_t count, loff_t *ppos) | |
770 | { | |
771 | char *page = NULL; | |
772 | ssize_t length = -EFAULT; | |
773 | int new_value; | |
774 | struct inode *inode; | |
775 | ||
776 | down(&sel_sem); | |
777 | ||
778 | length = task_has_security(current, SECURITY__SETBOOL); | |
779 | if (length) | |
780 | goto out; | |
781 | ||
782 | /* check to see if this file has been deleted */ | |
783 | if (!filep->f_op) | |
784 | goto out; | |
785 | ||
bfd51626 | 786 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
787 | length = -ENOMEM; |
788 | goto out; | |
789 | } | |
790 | if (*ppos != 0) { | |
791 | /* No partial writes. */ | |
792 | goto out; | |
793 | } | |
794 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
795 | if (!page) { | |
796 | length = -ENOMEM; | |
797 | goto out; | |
798 | } | |
799 | ||
800 | if (copy_from_user(page, buf, count)) | |
801 | goto out; | |
802 | ||
803 | length = -EINVAL; | |
804 | if (sscanf(page, "%d", &new_value) != 1) | |
805 | goto out; | |
806 | ||
807 | if (new_value) | |
808 | new_value = 1; | |
809 | ||
810 | inode = filep->f_dentry->d_inode; | |
811 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; | |
812 | length = count; | |
813 | ||
814 | out: | |
815 | up(&sel_sem); | |
816 | if (page) | |
817 | free_page((unsigned long) page); | |
818 | return length; | |
819 | } | |
820 | ||
821 | static struct file_operations sel_bool_ops = { | |
822 | .read = sel_read_bool, | |
823 | .write = sel_write_bool, | |
824 | }; | |
825 | ||
826 | static ssize_t sel_commit_bools_write(struct file *filep, | |
827 | const char __user *buf, | |
828 | size_t count, loff_t *ppos) | |
829 | { | |
830 | char *page = NULL; | |
831 | ssize_t length = -EFAULT; | |
832 | int new_value; | |
833 | ||
834 | down(&sel_sem); | |
835 | ||
836 | length = task_has_security(current, SECURITY__SETBOOL); | |
837 | if (length) | |
838 | goto out; | |
839 | ||
840 | /* check to see if this file has been deleted */ | |
841 | if (!filep->f_op) | |
842 | goto out; | |
843 | ||
bfd51626 | 844 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
845 | length = -ENOMEM; |
846 | goto out; | |
847 | } | |
848 | if (*ppos != 0) { | |
849 | /* No partial writes. */ | |
850 | goto out; | |
851 | } | |
852 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
853 | if (!page) { | |
854 | length = -ENOMEM; | |
855 | goto out; | |
856 | } | |
857 | ||
858 | if (copy_from_user(page, buf, count)) | |
859 | goto out; | |
860 | ||
861 | length = -EINVAL; | |
862 | if (sscanf(page, "%d", &new_value) != 1) | |
863 | goto out; | |
864 | ||
20c19e41 | 865 | if (new_value && bool_pending_values) { |
1da177e4 LT |
866 | security_set_bools(bool_num, bool_pending_values); |
867 | } | |
868 | ||
869 | length = count; | |
870 | ||
871 | out: | |
872 | up(&sel_sem); | |
873 | if (page) | |
874 | free_page((unsigned long) page); | |
875 | return length; | |
876 | } | |
877 | ||
878 | static struct file_operations sel_commit_bools_ops = { | |
879 | .write = sel_commit_bools_write, | |
880 | }; | |
881 | ||
882 | /* delete booleans - partial revoke() from | |
883 | * fs/proc/generic.c proc_kill_inodes */ | |
884 | static void sel_remove_bools(struct dentry *de) | |
885 | { | |
886 | struct list_head *p, *node; | |
887 | struct super_block *sb = de->d_sb; | |
888 | ||
889 | spin_lock(&dcache_lock); | |
890 | node = de->d_subdirs.next; | |
891 | while (node != &de->d_subdirs) { | |
5160ee6f | 892 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
893 | list_del_init(node); |
894 | ||
895 | if (d->d_inode) { | |
896 | d = dget_locked(d); | |
897 | spin_unlock(&dcache_lock); | |
898 | d_delete(d); | |
899 | simple_unlink(de->d_inode, d); | |
900 | dput(d); | |
901 | spin_lock(&dcache_lock); | |
902 | } | |
903 | node = de->d_subdirs.next; | |
904 | } | |
905 | ||
906 | spin_unlock(&dcache_lock); | |
907 | ||
908 | file_list_lock(); | |
909 | list_for_each(p, &sb->s_files) { | |
2f512016 | 910 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
1da177e4 LT |
911 | struct dentry * dentry = filp->f_dentry; |
912 | ||
913 | if (dentry->d_parent != de) { | |
914 | continue; | |
915 | } | |
916 | filp->f_op = NULL; | |
917 | } | |
918 | file_list_unlock(); | |
919 | } | |
920 | ||
921 | #define BOOL_DIR_NAME "booleans" | |
922 | ||
923 | static int sel_make_bools(void) | |
924 | { | |
925 | int i, ret = 0; | |
926 | ssize_t len; | |
927 | struct dentry *dentry = NULL; | |
928 | struct dentry *dir = bool_dir; | |
929 | struct inode *inode = NULL; | |
930 | struct inode_security_struct *isec; | |
931 | char **names = NULL, *page; | |
932 | int num; | |
933 | int *values = NULL; | |
934 | u32 sid; | |
935 | ||
936 | /* remove any existing files */ | |
9a5f04bf | 937 | kfree(bool_pending_values); |
20c19e41 | 938 | bool_pending_values = NULL; |
1da177e4 LT |
939 | |
940 | sel_remove_bools(dir); | |
941 | ||
942 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
943 | return -ENOMEM; | |
944 | ||
945 | ret = security_get_bools(&num, &names, &values); | |
946 | if (ret != 0) | |
947 | goto out; | |
948 | ||
949 | for (i = 0; i < num; i++) { | |
950 | dentry = d_alloc_name(dir, names[i]); | |
951 | if (!dentry) { | |
952 | ret = -ENOMEM; | |
953 | goto err; | |
954 | } | |
955 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
956 | if (!inode) { | |
957 | ret = -ENOMEM; | |
958 | goto err; | |
959 | } | |
960 | ||
961 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
962 | if (len < 0) { | |
963 | ret = -EINVAL; | |
964 | goto err; | |
965 | } else if (len >= PAGE_SIZE) { | |
966 | ret = -ENAMETOOLONG; | |
967 | goto err; | |
968 | } | |
969 | isec = (struct inode_security_struct*)inode->i_security; | |
970 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
971 | goto err; | |
972 | isec->sid = sid; | |
973 | isec->initialized = 1; | |
974 | inode->i_fop = &sel_bool_ops; | |
975 | inode->i_ino = i + BOOL_INO_OFFSET; | |
976 | d_add(dentry, inode); | |
977 | } | |
978 | bool_num = num; | |
979 | bool_pending_values = values; | |
980 | out: | |
981 | free_page((unsigned long)page); | |
982 | if (names) { | |
9a5f04bf JJ |
983 | for (i = 0; i < num; i++) |
984 | kfree(names[i]); | |
1da177e4 LT |
985 | kfree(names); |
986 | } | |
987 | return ret; | |
988 | err: | |
20c19e41 | 989 | kfree(values); |
1da177e4 LT |
990 | d_genocide(dir); |
991 | ret = -ENOMEM; | |
992 | goto out; | |
993 | } | |
994 | ||
995 | #define NULL_FILE_NAME "null" | |
996 | ||
997 | struct dentry *selinux_null = NULL; | |
998 | ||
999 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1000 | size_t count, loff_t *ppos) | |
1001 | { | |
1002 | char tmpbuf[TMPBUFLEN]; | |
1003 | ssize_t length; | |
1004 | ||
1005 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1006 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1007 | } | |
1008 | ||
1009 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1010 | const char __user * buf, | |
1011 | size_t count, loff_t *ppos) | |
1012 | ||
1013 | { | |
1014 | char *page; | |
1015 | ssize_t ret; | |
1016 | int new_value; | |
1017 | ||
bfd51626 | 1018 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1019 | ret = -ENOMEM; |
1020 | goto out; | |
1021 | } | |
1022 | ||
1023 | if (*ppos != 0) { | |
1024 | /* No partial writes. */ | |
1025 | ret = -EINVAL; | |
1026 | goto out; | |
1027 | } | |
1028 | ||
1029 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1030 | if (!page) { | |
1031 | ret = -ENOMEM; | |
1032 | goto out; | |
1033 | } | |
1034 | ||
1035 | if (copy_from_user(page, buf, count)) { | |
1036 | ret = -EFAULT; | |
1037 | goto out_free; | |
1038 | } | |
1039 | ||
1040 | if (sscanf(page, "%u", &new_value) != 1) { | |
1041 | ret = -EINVAL; | |
1042 | goto out; | |
1043 | } | |
1044 | ||
1045 | if (new_value != avc_cache_threshold) { | |
1046 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1047 | if (ret) | |
1048 | goto out_free; | |
1049 | avc_cache_threshold = new_value; | |
1050 | } | |
1051 | ret = count; | |
1052 | out_free: | |
1053 | free_page((unsigned long)page); | |
1054 | out: | |
1055 | return ret; | |
1056 | } | |
1057 | ||
1058 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1059 | size_t count, loff_t *ppos) | |
1060 | { | |
1061 | char *page; | |
1062 | ssize_t ret = 0; | |
1063 | ||
1064 | page = (char *)__get_free_page(GFP_KERNEL); | |
1065 | if (!page) { | |
1066 | ret = -ENOMEM; | |
1067 | goto out; | |
1068 | } | |
1069 | ret = avc_get_hash_stats(page); | |
1070 | if (ret >= 0) | |
1071 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1072 | free_page((unsigned long)page); | |
1073 | out: | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | static struct file_operations sel_avc_cache_threshold_ops = { | |
1078 | .read = sel_read_avc_cache_threshold, | |
1079 | .write = sel_write_avc_cache_threshold, | |
1080 | }; | |
1081 | ||
1082 | static struct file_operations sel_avc_hash_stats_ops = { | |
1083 | .read = sel_read_avc_hash_stats, | |
1084 | }; | |
1085 | ||
1086 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1087 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1088 | { | |
1089 | int cpu; | |
1090 | ||
1091 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1092 | if (!cpu_possible(cpu)) | |
1093 | continue; | |
1094 | *idx = cpu + 1; | |
1095 | return &per_cpu(avc_cache_stats, cpu); | |
1096 | } | |
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1101 | { | |
1102 | loff_t n = *pos - 1; | |
1103 | ||
1104 | if (*pos == 0) | |
1105 | return SEQ_START_TOKEN; | |
1106 | ||
1107 | return sel_avc_get_stat_idx(&n); | |
1108 | } | |
1109 | ||
1110 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1111 | { | |
1112 | return sel_avc_get_stat_idx(pos); | |
1113 | } | |
1114 | ||
1115 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1116 | { | |
1117 | struct avc_cache_stats *st = v; | |
1118 | ||
1119 | if (v == SEQ_START_TOKEN) | |
1120 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1121 | "frees\n"); | |
1122 | else | |
1123 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1124 | st->hits, st->misses, st->allocations, | |
1125 | st->reclaims, st->frees); | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1130 | { } | |
1131 | ||
1132 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1133 | .start = sel_avc_stats_seq_start, | |
1134 | .next = sel_avc_stats_seq_next, | |
1135 | .show = sel_avc_stats_seq_show, | |
1136 | .stop = sel_avc_stats_seq_stop, | |
1137 | }; | |
1138 | ||
1139 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1140 | { | |
1141 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1142 | } | |
1143 | ||
1144 | static struct file_operations sel_avc_cache_stats_ops = { | |
1145 | .open = sel_open_avc_cache_stats, | |
1146 | .read = seq_read, | |
1147 | .llseek = seq_lseek, | |
1148 | .release = seq_release, | |
1149 | }; | |
1150 | #endif | |
1151 | ||
1152 | static int sel_make_avc_files(struct dentry *dir) | |
1153 | { | |
1154 | int i, ret = 0; | |
1155 | static struct tree_descr files[] = { | |
1156 | { "cache_threshold", | |
1157 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1158 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1159 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1160 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1161 | #endif | |
1162 | }; | |
1163 | ||
6e20a64a | 1164 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1165 | struct inode *inode; |
1166 | struct dentry *dentry; | |
1167 | ||
1168 | dentry = d_alloc_name(dir, files[i].name); | |
1169 | if (!dentry) { | |
1170 | ret = -ENOMEM; | |
1171 | goto err; | |
1172 | } | |
1173 | ||
1174 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1175 | if (!inode) { | |
1176 | ret = -ENOMEM; | |
1177 | goto err; | |
1178 | } | |
1179 | inode->i_fop = files[i].ops; | |
1180 | d_add(dentry, inode); | |
1181 | } | |
1182 | out: | |
1183 | return ret; | |
1184 | err: | |
1185 | d_genocide(dir); | |
1186 | goto out; | |
1187 | } | |
1188 | ||
1189 | static int sel_make_dir(struct super_block *sb, struct dentry *dentry) | |
1190 | { | |
1191 | int ret = 0; | |
1192 | struct inode *inode; | |
1193 | ||
1194 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1195 | if (!inode) { | |
1196 | ret = -ENOMEM; | |
1197 | goto out; | |
1198 | } | |
1199 | inode->i_op = &simple_dir_inode_operations; | |
1200 | inode->i_fop = &simple_dir_operations; | |
1201 | d_add(dentry, inode); | |
1202 | out: | |
1203 | return ret; | |
1204 | } | |
1205 | ||
1206 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1207 | { | |
1208 | int ret; | |
1209 | struct dentry *dentry; | |
1210 | struct inode *inode; | |
1211 | struct inode_security_struct *isec; | |
1212 | ||
1213 | static struct tree_descr selinux_files[] = { | |
1214 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1215 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1216 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1217 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1218 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1219 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1220 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1221 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1222 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1223 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1224 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1225 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1226 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
1227 | /* last one */ {""} | |
1228 | }; | |
1229 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1230 | if (ret) | |
1231 | return ret; | |
1232 | ||
1233 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); | |
1234 | if (!dentry) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1238 | if (!inode) | |
1239 | goto out; | |
1240 | inode->i_op = &simple_dir_inode_operations; | |
1241 | inode->i_fop = &simple_dir_operations; | |
1242 | d_add(dentry, inode); | |
1243 | bool_dir = dentry; | |
1244 | ret = sel_make_bools(); | |
1245 | if (ret) | |
1246 | goto out; | |
1247 | ||
1248 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
1249 | if (!dentry) | |
1250 | return -ENOMEM; | |
1251 | ||
1252 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
1253 | if (!inode) | |
1254 | goto out; | |
1255 | isec = (struct inode_security_struct*)inode->i_security; | |
1256 | isec->sid = SECINITSID_DEVNULL; | |
1257 | isec->sclass = SECCLASS_CHR_FILE; | |
1258 | isec->initialized = 1; | |
1259 | ||
1260 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1261 | d_add(dentry, inode); | |
1262 | selinux_null = dentry; | |
1263 | ||
1264 | dentry = d_alloc_name(sb->s_root, "avc"); | |
1265 | if (!dentry) | |
1266 | return -ENOMEM; | |
1267 | ||
1268 | ret = sel_make_dir(sb, dentry); | |
1269 | if (ret) | |
1270 | goto out; | |
1271 | ||
1272 | ret = sel_make_avc_files(dentry); | |
1273 | if (ret) | |
1274 | goto out; | |
1275 | ||
1276 | return 0; | |
1277 | out: | |
1278 | dput(dentry); | |
1279 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); | |
1280 | return -ENOMEM; | |
1281 | } | |
1282 | ||
1283 | static struct super_block *sel_get_sb(struct file_system_type *fs_type, | |
1284 | int flags, const char *dev_name, void *data) | |
1285 | { | |
1286 | return get_sb_single(fs_type, flags, data, sel_fill_super); | |
1287 | } | |
1288 | ||
1289 | static struct file_system_type sel_fs_type = { | |
1290 | .name = "selinuxfs", | |
1291 | .get_sb = sel_get_sb, | |
1292 | .kill_sb = kill_litter_super, | |
1293 | }; | |
1294 | ||
1295 | struct vfsmount *selinuxfs_mount; | |
1296 | ||
1297 | static int __init init_sel_fs(void) | |
1298 | { | |
1299 | int err; | |
1300 | ||
1301 | if (!selinux_enabled) | |
1302 | return 0; | |
1303 | err = register_filesystem(&sel_fs_type); | |
1304 | if (!err) { | |
1305 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1306 | if (IS_ERR(selinuxfs_mount)) { | |
1307 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1308 | err = PTR_ERR(selinuxfs_mount); | |
1309 | selinuxfs_mount = NULL; | |
1310 | } | |
1311 | } | |
1312 | return err; | |
1313 | } | |
1314 | ||
1315 | __initcall(init_sel_fs); | |
1316 | ||
1317 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1318 | void exit_sel_fs(void) | |
1319 | { | |
1320 | unregister_filesystem(&sel_fs_type); | |
1321 | } | |
1322 | #endif |