]>
Commit | Line | Data |
---|---|---|
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> | |
bb003079 | 18 | #include <linux/mutex.h> |
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/string.h> | |
21 | #include <linux/security.h> | |
22 | #include <linux/major.h> | |
23 | #include <linux/seq_file.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/semaphore.h> | |
27 | ||
28 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
29 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
30 | ||
31 | #include "flask.h" | |
32 | #include "avc.h" | |
33 | #include "avc_ss.h" | |
34 | #include "security.h" | |
35 | #include "objsec.h" | |
36 | #include "conditional.h" | |
37 | ||
38 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; | |
39 | ||
40 | static int __init checkreqprot_setup(char *str) | |
41 | { | |
42 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; | |
43 | return 1; | |
44 | } | |
45 | __setup("checkreqprot=", checkreqprot_setup); | |
46 | ||
47 | ||
bb003079 | 48 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
49 | |
50 | /* global data for booleans */ | |
51 | static struct dentry *bool_dir = NULL; | |
52 | static int bool_num = 0; | |
53 | static int *bool_pending_values = NULL; | |
54 | ||
55 | extern void selnl_notify_setenforce(int val); | |
56 | ||
57 | /* Check whether a task is allowed to use a security operation. */ | |
58 | static int task_has_security(struct task_struct *tsk, | |
59 | u32 perms) | |
60 | { | |
61 | struct task_security_struct *tsec; | |
62 | ||
63 | tsec = tsk->security; | |
64 | if (!tsec) | |
65 | return -EACCES; | |
66 | ||
67 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, | |
68 | SECCLASS_SECURITY, perms, NULL); | |
69 | } | |
70 | ||
71 | enum sel_inos { | |
72 | SEL_ROOT_INO = 2, | |
73 | SEL_LOAD, /* load policy */ | |
74 | SEL_ENFORCE, /* get or set enforcing status */ | |
75 | SEL_CONTEXT, /* validate context */ | |
76 | SEL_ACCESS, /* compute access decision */ | |
77 | SEL_CREATE, /* compute create labeling decision */ | |
78 | SEL_RELABEL, /* compute relabeling decision */ | |
79 | SEL_USER, /* compute reachable user contexts */ | |
80 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
81 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
82 | SEL_MLS, /* return if MLS policy is enabled */ | |
83 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
84 | SEL_AVC, /* AVC management directory */ | |
85 | SEL_MEMBER, /* compute polyinstantiation membership decision */ | |
86 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
87 | }; | |
88 | ||
89 | #define TMPBUFLEN 12 | |
90 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
91 | size_t count, loff_t *ppos) | |
92 | { | |
93 | char tmpbuf[TMPBUFLEN]; | |
94 | ssize_t length; | |
95 | ||
96 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
97 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
98 | } | |
99 | ||
100 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
101 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, | |
102 | size_t count, loff_t *ppos) | |
103 | ||
104 | { | |
105 | char *page; | |
106 | ssize_t length; | |
107 | int new_value; | |
108 | ||
bfd51626 | 109 | if (count >= PAGE_SIZE) |
1da177e4 LT |
110 | return -ENOMEM; |
111 | if (*ppos != 0) { | |
112 | /* No partial writes. */ | |
113 | return -EINVAL; | |
114 | } | |
115 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
116 | if (!page) | |
117 | return -ENOMEM; | |
118 | length = -EFAULT; | |
119 | if (copy_from_user(page, buf, count)) | |
120 | goto out; | |
121 | ||
122 | length = -EINVAL; | |
123 | if (sscanf(page, "%d", &new_value) != 1) | |
124 | goto out; | |
125 | ||
126 | if (new_value != selinux_enforcing) { | |
127 | length = task_has_security(current, SECURITY__SETENFORCE); | |
128 | if (length) | |
129 | goto out; | |
130 | selinux_enforcing = new_value; | |
131 | if (selinux_enforcing) | |
132 | avc_ss_reset(0); | |
133 | selnl_notify_setenforce(selinux_enforcing); | |
134 | } | |
135 | length = count; | |
136 | out: | |
137 | free_page((unsigned long) page); | |
138 | return length; | |
139 | } | |
140 | #else | |
141 | #define sel_write_enforce NULL | |
142 | #endif | |
143 | ||
144 | static struct file_operations sel_enforce_ops = { | |
145 | .read = sel_read_enforce, | |
146 | .write = sel_write_enforce, | |
147 | }; | |
148 | ||
149 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
150 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, | |
151 | size_t count, loff_t *ppos) | |
152 | ||
153 | { | |
154 | char *page; | |
155 | ssize_t length; | |
156 | int new_value; | |
157 | extern int selinux_disable(void); | |
158 | ||
bfd51626 | 159 | if (count >= PAGE_SIZE) |
1da177e4 LT |
160 | return -ENOMEM; |
161 | if (*ppos != 0) { | |
162 | /* No partial writes. */ | |
163 | return -EINVAL; | |
164 | } | |
165 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
166 | if (!page) | |
167 | return -ENOMEM; | |
168 | length = -EFAULT; | |
169 | if (copy_from_user(page, buf, count)) | |
170 | goto out; | |
171 | ||
172 | length = -EINVAL; | |
173 | if (sscanf(page, "%d", &new_value) != 1) | |
174 | goto out; | |
175 | ||
176 | if (new_value) { | |
177 | length = selinux_disable(); | |
178 | if (length < 0) | |
179 | goto out; | |
180 | } | |
181 | ||
182 | length = count; | |
183 | out: | |
184 | free_page((unsigned long) page); | |
185 | return length; | |
186 | } | |
187 | #else | |
188 | #define sel_write_disable NULL | |
189 | #endif | |
190 | ||
191 | static struct file_operations sel_disable_ops = { | |
192 | .write = sel_write_disable, | |
193 | }; | |
194 | ||
195 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
196 | size_t count, loff_t *ppos) | |
197 | { | |
198 | char tmpbuf[TMPBUFLEN]; | |
199 | ssize_t length; | |
200 | ||
201 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
202 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
203 | } | |
204 | ||
205 | static struct file_operations sel_policyvers_ops = { | |
206 | .read = sel_read_policyvers, | |
207 | }; | |
208 | ||
209 | /* declaration for sel_write_load */ | |
210 | static int sel_make_bools(void); | |
211 | ||
212 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
213 | size_t count, loff_t *ppos) | |
214 | { | |
215 | char tmpbuf[TMPBUFLEN]; | |
216 | ssize_t length; | |
217 | ||
218 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); | |
219 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
220 | } | |
221 | ||
222 | static struct file_operations sel_mls_ops = { | |
223 | .read = sel_read_mls, | |
224 | }; | |
225 | ||
226 | static ssize_t sel_write_load(struct file * file, const char __user * buf, | |
227 | size_t count, loff_t *ppos) | |
228 | ||
229 | { | |
230 | int ret; | |
231 | ssize_t length; | |
232 | void *data = NULL; | |
233 | ||
bb003079 | 234 | mutex_lock(&sel_mutex); |
1da177e4 LT |
235 | |
236 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
237 | if (length) | |
238 | goto out; | |
239 | ||
240 | if (*ppos != 0) { | |
241 | /* No partial writes. */ | |
242 | length = -EINVAL; | |
243 | goto out; | |
244 | } | |
245 | ||
bfd51626 | 246 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
247 | || (data = vmalloc(count)) == NULL) { |
248 | length = -ENOMEM; | |
249 | goto out; | |
250 | } | |
251 | ||
252 | length = -EFAULT; | |
253 | if (copy_from_user(data, buf, count) != 0) | |
254 | goto out; | |
255 | ||
256 | length = security_load_policy(data, count); | |
257 | if (length) | |
258 | goto out; | |
259 | ||
260 | ret = sel_make_bools(); | |
261 | if (ret) | |
262 | length = ret; | |
263 | else | |
264 | length = count; | |
265 | out: | |
bb003079 | 266 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
267 | vfree(data); |
268 | return length; | |
269 | } | |
270 | ||
271 | static struct file_operations sel_load_ops = { | |
272 | .write = sel_write_load, | |
273 | }; | |
274 | ||
ce9982d0 | 275 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
1da177e4 | 276 | { |
ce9982d0 SS |
277 | char *canon; |
278 | u32 sid, len; | |
1da177e4 LT |
279 | ssize_t length; |
280 | ||
281 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
282 | if (length) | |
283 | return length; | |
284 | ||
ce9982d0 SS |
285 | length = security_context_to_sid(buf, size, &sid); |
286 | if (length < 0) | |
287 | return length; | |
1da177e4 | 288 | |
ce9982d0 | 289 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 290 | if (length < 0) |
ce9982d0 SS |
291 | return length; |
292 | ||
293 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
294 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
295 | "max\n", __FUNCTION__, len); | |
296 | length = -ERANGE; | |
1da177e4 | 297 | goto out; |
ce9982d0 | 298 | } |
1da177e4 | 299 | |
ce9982d0 SS |
300 | memcpy(buf, canon, len); |
301 | length = len; | |
1da177e4 | 302 | out: |
ce9982d0 | 303 | kfree(canon); |
1da177e4 LT |
304 | return length; |
305 | } | |
306 | ||
1da177e4 LT |
307 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
308 | size_t count, loff_t *ppos) | |
309 | { | |
310 | char tmpbuf[TMPBUFLEN]; | |
311 | ssize_t length; | |
312 | ||
313 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
314 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
315 | } | |
316 | ||
317 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
318 | size_t count, loff_t *ppos) | |
319 | { | |
320 | char *page; | |
321 | ssize_t length; | |
322 | unsigned int new_value; | |
323 | ||
324 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
325 | if (length) | |
326 | return length; | |
327 | ||
bfd51626 | 328 | if (count >= PAGE_SIZE) |
1da177e4 LT |
329 | return -ENOMEM; |
330 | if (*ppos != 0) { | |
331 | /* No partial writes. */ | |
332 | return -EINVAL; | |
333 | } | |
334 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
335 | if (!page) | |
336 | return -ENOMEM; | |
337 | length = -EFAULT; | |
338 | if (copy_from_user(page, buf, count)) | |
339 | goto out; | |
340 | ||
341 | length = -EINVAL; | |
342 | if (sscanf(page, "%u", &new_value) != 1) | |
343 | goto out; | |
344 | ||
345 | selinux_checkreqprot = new_value ? 1 : 0; | |
346 | length = count; | |
347 | out: | |
348 | free_page((unsigned long) page); | |
349 | return length; | |
350 | } | |
351 | static struct file_operations sel_checkreqprot_ops = { | |
352 | .read = sel_read_checkreqprot, | |
353 | .write = sel_write_checkreqprot, | |
354 | }; | |
355 | ||
356 | /* | |
357 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
358 | */ | |
359 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
360 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
361 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
362 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
363 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
364 | ||
365 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
366 | [SEL_ACCESS] = sel_write_access, | |
367 | [SEL_CREATE] = sel_write_create, | |
368 | [SEL_RELABEL] = sel_write_relabel, | |
369 | [SEL_USER] = sel_write_user, | |
370 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 371 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
372 | }; |
373 | ||
374 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
375 | { | |
376 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
377 | char *data; | |
378 | ssize_t rv; | |
379 | ||
6e20a64a | 380 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
381 | return -EINVAL; |
382 | ||
383 | data = simple_transaction_get(file, buf, size); | |
384 | if (IS_ERR(data)) | |
385 | return PTR_ERR(data); | |
386 | ||
387 | rv = write_op[ino](file, data, size); | |
388 | if (rv>0) { | |
389 | simple_transaction_set(file, rv); | |
390 | rv = size; | |
391 | } | |
392 | return rv; | |
393 | } | |
394 | ||
395 | static struct file_operations transaction_ops = { | |
396 | .write = selinux_transaction_write, | |
397 | .read = simple_transaction_read, | |
398 | .release = simple_transaction_release, | |
399 | }; | |
400 | ||
401 | /* | |
402 | * payload - write methods | |
403 | * If the method has a response, the response should be put in buf, | |
404 | * and the length returned. Otherwise return 0 or and -error. | |
405 | */ | |
406 | ||
407 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
408 | { | |
409 | char *scon, *tcon; | |
410 | u32 ssid, tsid; | |
411 | u16 tclass; | |
412 | u32 req; | |
413 | struct av_decision avd; | |
414 | ssize_t length; | |
415 | ||
416 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
417 | if (length) | |
418 | return length; | |
419 | ||
420 | length = -ENOMEM; | |
89d155ef | 421 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
422 | if (!scon) |
423 | return length; | |
1da177e4 | 424 | |
89d155ef | 425 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
426 | if (!tcon) |
427 | goto out; | |
1da177e4 LT |
428 | |
429 | length = -EINVAL; | |
430 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
431 | goto out2; | |
432 | ||
433 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
434 | if (length < 0) | |
435 | goto out2; | |
436 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
437 | if (length < 0) | |
438 | goto out2; | |
439 | ||
440 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
441 | if (length < 0) | |
442 | goto out2; | |
443 | ||
444 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
445 | "%x %x %x %x %u", | |
446 | avd.allowed, avd.decided, | |
447 | avd.auditallow, avd.auditdeny, | |
448 | avd.seqno); | |
449 | out2: | |
450 | kfree(tcon); | |
451 | out: | |
452 | kfree(scon); | |
453 | return length; | |
454 | } | |
455 | ||
456 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
457 | { | |
458 | char *scon, *tcon; | |
459 | u32 ssid, tsid, newsid; | |
460 | u16 tclass; | |
461 | ssize_t length; | |
462 | char *newcon; | |
463 | u32 len; | |
464 | ||
465 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
466 | if (length) | |
467 | return length; | |
468 | ||
469 | length = -ENOMEM; | |
89d155ef | 470 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
471 | if (!scon) |
472 | return length; | |
1da177e4 | 473 | |
89d155ef | 474 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
475 | if (!tcon) |
476 | goto out; | |
1da177e4 LT |
477 | |
478 | length = -EINVAL; | |
479 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
480 | goto out2; | |
481 | ||
482 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
483 | if (length < 0) | |
484 | goto out2; | |
485 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
486 | if (length < 0) | |
487 | goto out2; | |
488 | ||
489 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
490 | if (length < 0) | |
491 | goto out2; | |
492 | ||
493 | length = security_sid_to_context(newsid, &newcon, &len); | |
494 | if (length < 0) | |
495 | goto out2; | |
496 | ||
497 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
498 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
499 | "max\n", __FUNCTION__, len); | |
500 | length = -ERANGE; | |
501 | goto out3; | |
502 | } | |
503 | ||
504 | memcpy(buf, newcon, len); | |
505 | length = len; | |
506 | out3: | |
507 | kfree(newcon); | |
508 | out2: | |
509 | kfree(tcon); | |
510 | out: | |
511 | kfree(scon); | |
512 | return length; | |
513 | } | |
514 | ||
515 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
516 | { | |
517 | char *scon, *tcon; | |
518 | u32 ssid, tsid, newsid; | |
519 | u16 tclass; | |
520 | ssize_t length; | |
521 | char *newcon; | |
522 | u32 len; | |
523 | ||
524 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
525 | if (length) | |
526 | return length; | |
527 | ||
528 | length = -ENOMEM; | |
89d155ef | 529 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
530 | if (!scon) |
531 | return length; | |
1da177e4 | 532 | |
89d155ef | 533 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
534 | if (!tcon) |
535 | goto out; | |
1da177e4 LT |
536 | |
537 | length = -EINVAL; | |
538 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
539 | goto out2; | |
540 | ||
541 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
542 | if (length < 0) | |
543 | goto out2; | |
544 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
545 | if (length < 0) | |
546 | goto out2; | |
547 | ||
548 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
549 | if (length < 0) | |
550 | goto out2; | |
551 | ||
552 | length = security_sid_to_context(newsid, &newcon, &len); | |
553 | if (length < 0) | |
554 | goto out2; | |
555 | ||
556 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
557 | length = -ERANGE; | |
558 | goto out3; | |
559 | } | |
560 | ||
561 | memcpy(buf, newcon, len); | |
562 | length = len; | |
563 | out3: | |
564 | kfree(newcon); | |
565 | out2: | |
566 | kfree(tcon); | |
567 | out: | |
568 | kfree(scon); | |
569 | return length; | |
570 | } | |
571 | ||
572 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
573 | { | |
574 | char *con, *user, *ptr; | |
575 | u32 sid, *sids; | |
576 | ssize_t length; | |
577 | char *newcon; | |
578 | int i, rc; | |
579 | u32 len, nsids; | |
580 | ||
581 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
582 | if (length) | |
583 | return length; | |
584 | ||
585 | length = -ENOMEM; | |
89d155ef | 586 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
587 | if (!con) |
588 | return length; | |
1da177e4 | 589 | |
89d155ef | 590 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
591 | if (!user) |
592 | goto out; | |
1da177e4 LT |
593 | |
594 | length = -EINVAL; | |
595 | if (sscanf(buf, "%s %s", con, user) != 2) | |
596 | goto out2; | |
597 | ||
598 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
599 | if (length < 0) | |
600 | goto out2; | |
601 | ||
602 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
603 | if (length < 0) | |
604 | goto out2; | |
605 | ||
606 | length = sprintf(buf, "%u", nsids) + 1; | |
607 | ptr = buf + length; | |
608 | for (i = 0; i < nsids; i++) { | |
609 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
610 | if (rc) { | |
611 | length = rc; | |
612 | goto out3; | |
613 | } | |
614 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
615 | kfree(newcon); | |
616 | length = -ERANGE; | |
617 | goto out3; | |
618 | } | |
619 | memcpy(ptr, newcon, len); | |
620 | kfree(newcon); | |
621 | ptr += len; | |
622 | length += len; | |
623 | } | |
624 | out3: | |
625 | kfree(sids); | |
626 | out2: | |
627 | kfree(user); | |
628 | out: | |
629 | kfree(con); | |
630 | return length; | |
631 | } | |
632 | ||
633 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
634 | { | |
635 | char *scon, *tcon; | |
636 | u32 ssid, tsid, newsid; | |
637 | u16 tclass; | |
638 | ssize_t length; | |
639 | char *newcon; | |
640 | u32 len; | |
641 | ||
642 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
643 | if (length) | |
644 | return length; | |
645 | ||
646 | length = -ENOMEM; | |
89d155ef | 647 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
648 | if (!scon) |
649 | return length; | |
1da177e4 | 650 | |
89d155ef | 651 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
652 | if (!tcon) |
653 | goto out; | |
1da177e4 LT |
654 | |
655 | length = -EINVAL; | |
656 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
657 | goto out2; | |
658 | ||
659 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
660 | if (length < 0) | |
661 | goto out2; | |
662 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
663 | if (length < 0) | |
664 | goto out2; | |
665 | ||
666 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
667 | if (length < 0) | |
668 | goto out2; | |
669 | ||
670 | length = security_sid_to_context(newsid, &newcon, &len); | |
671 | if (length < 0) | |
672 | goto out2; | |
673 | ||
674 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
675 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
676 | "max\n", __FUNCTION__, len); | |
677 | length = -ERANGE; | |
678 | goto out3; | |
679 | } | |
680 | ||
681 | memcpy(buf, newcon, len); | |
682 | length = len; | |
683 | out3: | |
684 | kfree(newcon); | |
685 | out2: | |
686 | kfree(tcon); | |
687 | out: | |
688 | kfree(scon); | |
689 | return length; | |
690 | } | |
691 | ||
692 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
693 | { | |
694 | struct inode *ret = new_inode(sb); | |
695 | ||
696 | if (ret) { | |
697 | ret->i_mode = mode; | |
698 | ret->i_uid = ret->i_gid = 0; | |
699 | ret->i_blksize = PAGE_CACHE_SIZE; | |
700 | ret->i_blocks = 0; | |
701 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
702 | } | |
703 | return ret; | |
704 | } | |
705 | ||
706 | #define BOOL_INO_OFFSET 30 | |
707 | ||
708 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, | |
709 | size_t count, loff_t *ppos) | |
710 | { | |
711 | char *page = NULL; | |
712 | ssize_t length; | |
1da177e4 LT |
713 | ssize_t ret; |
714 | int cur_enforcing; | |
715 | struct inode *inode; | |
716 | ||
bb003079 | 717 | mutex_lock(&sel_mutex); |
1da177e4 LT |
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]); | |
68bdcf28 | 743 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 744 | out: |
bb003079 | 745 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
746 | if (page) |
747 | free_page((unsigned long)page); | |
748 | return ret; | |
749 | } | |
750 | ||
751 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
752 | size_t count, loff_t *ppos) | |
753 | { | |
754 | char *page = NULL; | |
755 | ssize_t length = -EFAULT; | |
756 | int new_value; | |
757 | struct inode *inode; | |
758 | ||
bb003079 | 759 | mutex_lock(&sel_mutex); |
1da177e4 LT |
760 | |
761 | length = task_has_security(current, SECURITY__SETBOOL); | |
762 | if (length) | |
763 | goto out; | |
764 | ||
765 | /* check to see if this file has been deleted */ | |
766 | if (!filep->f_op) | |
767 | goto out; | |
768 | ||
bfd51626 | 769 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
770 | length = -ENOMEM; |
771 | goto out; | |
772 | } | |
773 | if (*ppos != 0) { | |
774 | /* No partial writes. */ | |
775 | goto out; | |
776 | } | |
777 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
778 | if (!page) { | |
779 | length = -ENOMEM; | |
780 | goto out; | |
781 | } | |
782 | ||
783 | if (copy_from_user(page, buf, count)) | |
784 | goto out; | |
785 | ||
786 | length = -EINVAL; | |
787 | if (sscanf(page, "%d", &new_value) != 1) | |
788 | goto out; | |
789 | ||
790 | if (new_value) | |
791 | new_value = 1; | |
792 | ||
793 | inode = filep->f_dentry->d_inode; | |
794 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; | |
795 | length = count; | |
796 | ||
797 | out: | |
bb003079 | 798 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
799 | if (page) |
800 | free_page((unsigned long) page); | |
801 | return length; | |
802 | } | |
803 | ||
804 | static struct file_operations sel_bool_ops = { | |
805 | .read = sel_read_bool, | |
806 | .write = sel_write_bool, | |
807 | }; | |
808 | ||
809 | static ssize_t sel_commit_bools_write(struct file *filep, | |
810 | const char __user *buf, | |
811 | size_t count, loff_t *ppos) | |
812 | { | |
813 | char *page = NULL; | |
814 | ssize_t length = -EFAULT; | |
815 | int new_value; | |
816 | ||
bb003079 | 817 | mutex_lock(&sel_mutex); |
1da177e4 LT |
818 | |
819 | length = task_has_security(current, SECURITY__SETBOOL); | |
820 | if (length) | |
821 | goto out; | |
822 | ||
823 | /* check to see if this file has been deleted */ | |
824 | if (!filep->f_op) | |
825 | goto out; | |
826 | ||
bfd51626 | 827 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
828 | length = -ENOMEM; |
829 | goto out; | |
830 | } | |
831 | if (*ppos != 0) { | |
832 | /* No partial writes. */ | |
833 | goto out; | |
834 | } | |
835 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
836 | if (!page) { | |
837 | length = -ENOMEM; | |
838 | goto out; | |
839 | } | |
840 | ||
841 | if (copy_from_user(page, buf, count)) | |
842 | goto out; | |
843 | ||
844 | length = -EINVAL; | |
845 | if (sscanf(page, "%d", &new_value) != 1) | |
846 | goto out; | |
847 | ||
20c19e41 | 848 | if (new_value && bool_pending_values) { |
1da177e4 LT |
849 | security_set_bools(bool_num, bool_pending_values); |
850 | } | |
851 | ||
852 | length = count; | |
853 | ||
854 | out: | |
bb003079 | 855 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
856 | if (page) |
857 | free_page((unsigned long) page); | |
858 | return length; | |
859 | } | |
860 | ||
861 | static struct file_operations sel_commit_bools_ops = { | |
862 | .write = sel_commit_bools_write, | |
863 | }; | |
864 | ||
865 | /* delete booleans - partial revoke() from | |
866 | * fs/proc/generic.c proc_kill_inodes */ | |
867 | static void sel_remove_bools(struct dentry *de) | |
868 | { | |
869 | struct list_head *p, *node; | |
870 | struct super_block *sb = de->d_sb; | |
871 | ||
872 | spin_lock(&dcache_lock); | |
873 | node = de->d_subdirs.next; | |
874 | while (node != &de->d_subdirs) { | |
5160ee6f | 875 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
876 | list_del_init(node); |
877 | ||
878 | if (d->d_inode) { | |
879 | d = dget_locked(d); | |
880 | spin_unlock(&dcache_lock); | |
881 | d_delete(d); | |
882 | simple_unlink(de->d_inode, d); | |
883 | dput(d); | |
884 | spin_lock(&dcache_lock); | |
885 | } | |
886 | node = de->d_subdirs.next; | |
887 | } | |
888 | ||
889 | spin_unlock(&dcache_lock); | |
890 | ||
891 | file_list_lock(); | |
892 | list_for_each(p, &sb->s_files) { | |
2f512016 | 893 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
1da177e4 LT |
894 | struct dentry * dentry = filp->f_dentry; |
895 | ||
896 | if (dentry->d_parent != de) { | |
897 | continue; | |
898 | } | |
899 | filp->f_op = NULL; | |
900 | } | |
901 | file_list_unlock(); | |
902 | } | |
903 | ||
904 | #define BOOL_DIR_NAME "booleans" | |
905 | ||
906 | static int sel_make_bools(void) | |
907 | { | |
908 | int i, ret = 0; | |
909 | ssize_t len; | |
910 | struct dentry *dentry = NULL; | |
911 | struct dentry *dir = bool_dir; | |
912 | struct inode *inode = NULL; | |
913 | struct inode_security_struct *isec; | |
914 | char **names = NULL, *page; | |
915 | int num; | |
916 | int *values = NULL; | |
917 | u32 sid; | |
918 | ||
919 | /* remove any existing files */ | |
9a5f04bf | 920 | kfree(bool_pending_values); |
20c19e41 | 921 | bool_pending_values = NULL; |
1da177e4 LT |
922 | |
923 | sel_remove_bools(dir); | |
924 | ||
925 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
926 | return -ENOMEM; | |
927 | ||
928 | ret = security_get_bools(&num, &names, &values); | |
929 | if (ret != 0) | |
930 | goto out; | |
931 | ||
932 | for (i = 0; i < num; i++) { | |
933 | dentry = d_alloc_name(dir, names[i]); | |
934 | if (!dentry) { | |
935 | ret = -ENOMEM; | |
936 | goto err; | |
937 | } | |
938 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
939 | if (!inode) { | |
940 | ret = -ENOMEM; | |
941 | goto err; | |
942 | } | |
943 | ||
944 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
945 | if (len < 0) { | |
946 | ret = -EINVAL; | |
947 | goto err; | |
948 | } else if (len >= PAGE_SIZE) { | |
949 | ret = -ENAMETOOLONG; | |
950 | goto err; | |
951 | } | |
952 | isec = (struct inode_security_struct*)inode->i_security; | |
953 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
954 | goto err; | |
955 | isec->sid = sid; | |
956 | isec->initialized = 1; | |
957 | inode->i_fop = &sel_bool_ops; | |
958 | inode->i_ino = i + BOOL_INO_OFFSET; | |
959 | d_add(dentry, inode); | |
960 | } | |
961 | bool_num = num; | |
962 | bool_pending_values = values; | |
963 | out: | |
964 | free_page((unsigned long)page); | |
965 | if (names) { | |
9a5f04bf JJ |
966 | for (i = 0; i < num; i++) |
967 | kfree(names[i]); | |
1da177e4 LT |
968 | kfree(names); |
969 | } | |
970 | return ret; | |
971 | err: | |
20c19e41 | 972 | kfree(values); |
1da177e4 LT |
973 | d_genocide(dir); |
974 | ret = -ENOMEM; | |
975 | goto out; | |
976 | } | |
977 | ||
978 | #define NULL_FILE_NAME "null" | |
979 | ||
980 | struct dentry *selinux_null = NULL; | |
981 | ||
982 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
983 | size_t count, loff_t *ppos) | |
984 | { | |
985 | char tmpbuf[TMPBUFLEN]; | |
986 | ssize_t length; | |
987 | ||
988 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
989 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
990 | } | |
991 | ||
992 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
993 | const char __user * buf, | |
994 | size_t count, loff_t *ppos) | |
995 | ||
996 | { | |
997 | char *page; | |
998 | ssize_t ret; | |
999 | int new_value; | |
1000 | ||
bfd51626 | 1001 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1002 | ret = -ENOMEM; |
1003 | goto out; | |
1004 | } | |
1005 | ||
1006 | if (*ppos != 0) { | |
1007 | /* No partial writes. */ | |
1008 | ret = -EINVAL; | |
1009 | goto out; | |
1010 | } | |
1011 | ||
1012 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1013 | if (!page) { | |
1014 | ret = -ENOMEM; | |
1015 | goto out; | |
1016 | } | |
1017 | ||
1018 | if (copy_from_user(page, buf, count)) { | |
1019 | ret = -EFAULT; | |
1020 | goto out_free; | |
1021 | } | |
1022 | ||
1023 | if (sscanf(page, "%u", &new_value) != 1) { | |
1024 | ret = -EINVAL; | |
1025 | goto out; | |
1026 | } | |
1027 | ||
1028 | if (new_value != avc_cache_threshold) { | |
1029 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1030 | if (ret) | |
1031 | goto out_free; | |
1032 | avc_cache_threshold = new_value; | |
1033 | } | |
1034 | ret = count; | |
1035 | out_free: | |
1036 | free_page((unsigned long)page); | |
1037 | out: | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1042 | size_t count, loff_t *ppos) | |
1043 | { | |
1044 | char *page; | |
1045 | ssize_t ret = 0; | |
1046 | ||
1047 | page = (char *)__get_free_page(GFP_KERNEL); | |
1048 | if (!page) { | |
1049 | ret = -ENOMEM; | |
1050 | goto out; | |
1051 | } | |
1052 | ret = avc_get_hash_stats(page); | |
1053 | if (ret >= 0) | |
1054 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1055 | free_page((unsigned long)page); | |
1056 | out: | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | static struct file_operations sel_avc_cache_threshold_ops = { | |
1061 | .read = sel_read_avc_cache_threshold, | |
1062 | .write = sel_write_avc_cache_threshold, | |
1063 | }; | |
1064 | ||
1065 | static struct file_operations sel_avc_hash_stats_ops = { | |
1066 | .read = sel_read_avc_hash_stats, | |
1067 | }; | |
1068 | ||
1069 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1070 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1071 | { | |
1072 | int cpu; | |
1073 | ||
1074 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1075 | if (!cpu_possible(cpu)) | |
1076 | continue; | |
1077 | *idx = cpu + 1; | |
1078 | return &per_cpu(avc_cache_stats, cpu); | |
1079 | } | |
1080 | return NULL; | |
1081 | } | |
1082 | ||
1083 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1084 | { | |
1085 | loff_t n = *pos - 1; | |
1086 | ||
1087 | if (*pos == 0) | |
1088 | return SEQ_START_TOKEN; | |
1089 | ||
1090 | return sel_avc_get_stat_idx(&n); | |
1091 | } | |
1092 | ||
1093 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1094 | { | |
1095 | return sel_avc_get_stat_idx(pos); | |
1096 | } | |
1097 | ||
1098 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1099 | { | |
1100 | struct avc_cache_stats *st = v; | |
1101 | ||
1102 | if (v == SEQ_START_TOKEN) | |
1103 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1104 | "frees\n"); | |
1105 | else | |
1106 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1107 | st->hits, st->misses, st->allocations, | |
1108 | st->reclaims, st->frees); | |
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1113 | { } | |
1114 | ||
1115 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1116 | .start = sel_avc_stats_seq_start, | |
1117 | .next = sel_avc_stats_seq_next, | |
1118 | .show = sel_avc_stats_seq_show, | |
1119 | .stop = sel_avc_stats_seq_stop, | |
1120 | }; | |
1121 | ||
1122 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1123 | { | |
1124 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1125 | } | |
1126 | ||
1127 | static struct file_operations sel_avc_cache_stats_ops = { | |
1128 | .open = sel_open_avc_cache_stats, | |
1129 | .read = seq_read, | |
1130 | .llseek = seq_lseek, | |
1131 | .release = seq_release, | |
1132 | }; | |
1133 | #endif | |
1134 | ||
1135 | static int sel_make_avc_files(struct dentry *dir) | |
1136 | { | |
1137 | int i, ret = 0; | |
1138 | static struct tree_descr files[] = { | |
1139 | { "cache_threshold", | |
1140 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1141 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1142 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1143 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1144 | #endif | |
1145 | }; | |
1146 | ||
6e20a64a | 1147 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1148 | struct inode *inode; |
1149 | struct dentry *dentry; | |
1150 | ||
1151 | dentry = d_alloc_name(dir, files[i].name); | |
1152 | if (!dentry) { | |
1153 | ret = -ENOMEM; | |
1154 | goto err; | |
1155 | } | |
1156 | ||
1157 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1158 | if (!inode) { | |
1159 | ret = -ENOMEM; | |
1160 | goto err; | |
1161 | } | |
1162 | inode->i_fop = files[i].ops; | |
1163 | d_add(dentry, inode); | |
1164 | } | |
1165 | out: | |
1166 | return ret; | |
1167 | err: | |
1168 | d_genocide(dir); | |
1169 | goto out; | |
1170 | } | |
1171 | ||
1172 | static int sel_make_dir(struct super_block *sb, struct dentry *dentry) | |
1173 | { | |
1174 | int ret = 0; | |
1175 | struct inode *inode; | |
1176 | ||
1177 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1178 | if (!inode) { | |
1179 | ret = -ENOMEM; | |
1180 | goto out; | |
1181 | } | |
1182 | inode->i_op = &simple_dir_inode_operations; | |
1183 | inode->i_fop = &simple_dir_operations; | |
40e906f8 JM |
1184 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
1185 | inode->i_nlink++; | |
1da177e4 LT |
1186 | d_add(dentry, inode); |
1187 | out: | |
1188 | return ret; | |
1189 | } | |
1190 | ||
1191 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1192 | { | |
1193 | int ret; | |
1194 | struct dentry *dentry; | |
1195 | struct inode *inode; | |
1196 | struct inode_security_struct *isec; | |
1197 | ||
1198 | static struct tree_descr selinux_files[] = { | |
1199 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1200 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1201 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1202 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1203 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1204 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1205 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1206 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1207 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1208 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1209 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1210 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1211 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
1212 | /* last one */ {""} | |
1213 | }; | |
1214 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1215 | if (ret) | |
1216 | return ret; | |
1217 | ||
1218 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); | |
1219 | if (!dentry) | |
1220 | return -ENOMEM; | |
1221 | ||
1222 | inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1223 | if (!inode) | |
1224 | goto out; | |
1225 | inode->i_op = &simple_dir_inode_operations; | |
1226 | inode->i_fop = &simple_dir_operations; | |
40e906f8 JM |
1227 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
1228 | inode->i_nlink++; | |
1da177e4 LT |
1229 | d_add(dentry, inode); |
1230 | bool_dir = dentry; | |
1231 | ret = sel_make_bools(); | |
1232 | if (ret) | |
1233 | goto out; | |
1234 | ||
1235 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
1236 | if (!dentry) | |
1237 | return -ENOMEM; | |
1238 | ||
1239 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
1240 | if (!inode) | |
1241 | goto out; | |
1242 | isec = (struct inode_security_struct*)inode->i_security; | |
1243 | isec->sid = SECINITSID_DEVNULL; | |
1244 | isec->sclass = SECCLASS_CHR_FILE; | |
1245 | isec->initialized = 1; | |
1246 | ||
1247 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1248 | d_add(dentry, inode); | |
1249 | selinux_null = dentry; | |
1250 | ||
1251 | dentry = d_alloc_name(sb->s_root, "avc"); | |
1252 | if (!dentry) | |
1253 | return -ENOMEM; | |
1254 | ||
1255 | ret = sel_make_dir(sb, dentry); | |
1256 | if (ret) | |
1257 | goto out; | |
1258 | ||
1259 | ret = sel_make_avc_files(dentry); | |
1260 | if (ret) | |
1261 | goto out; | |
1262 | ||
1263 | return 0; | |
1264 | out: | |
1265 | dput(dentry); | |
1266 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); | |
1267 | return -ENOMEM; | |
1268 | } | |
1269 | ||
1270 | static struct super_block *sel_get_sb(struct file_system_type *fs_type, | |
1271 | int flags, const char *dev_name, void *data) | |
1272 | { | |
1273 | return get_sb_single(fs_type, flags, data, sel_fill_super); | |
1274 | } | |
1275 | ||
1276 | static struct file_system_type sel_fs_type = { | |
1277 | .name = "selinuxfs", | |
1278 | .get_sb = sel_get_sb, | |
1279 | .kill_sb = kill_litter_super, | |
1280 | }; | |
1281 | ||
1282 | struct vfsmount *selinuxfs_mount; | |
1283 | ||
1284 | static int __init init_sel_fs(void) | |
1285 | { | |
1286 | int err; | |
1287 | ||
1288 | if (!selinux_enabled) | |
1289 | return 0; | |
1290 | err = register_filesystem(&sel_fs_type); | |
1291 | if (!err) { | |
1292 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1293 | if (IS_ERR(selinuxfs_mount)) { | |
1294 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1295 | err = PTR_ERR(selinuxfs_mount); | |
1296 | selinuxfs_mount = NULL; | |
1297 | } | |
1298 | } | |
1299 | return err; | |
1300 | } | |
1301 | ||
1302 | __initcall(init_sel_fs); | |
1303 | ||
1304 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1305 | void exit_sel_fs(void) | |
1306 | { | |
1307 | unregister_filesystem(&sel_fs_type); | |
1308 | } | |
1309 | #endif |