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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> | |
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> | |
af601e46 | 25 | #include <linux/audit.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | #include <asm/semaphore.h> | |
28 | ||
29 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
30 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
31 | ||
32 | #include "flask.h" | |
33 | #include "avc.h" | |
34 | #include "avc_ss.h" | |
35 | #include "security.h" | |
36 | #include "objsec.h" | |
37 | #include "conditional.h" | |
38 | ||
39 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; | |
40 | ||
4e5ab4cb JM |
41 | #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT |
42 | #define SELINUX_COMPAT_NET_VALUE 0 | |
43 | #else | |
44 | #define SELINUX_COMPAT_NET_VALUE 1 | |
45 | #endif | |
46 | ||
47 | int selinux_compat_net = SELINUX_COMPAT_NET_VALUE; | |
48 | ||
1da177e4 LT |
49 | static int __init checkreqprot_setup(char *str) |
50 | { | |
51 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; | |
52 | return 1; | |
53 | } | |
54 | __setup("checkreqprot=", checkreqprot_setup); | |
55 | ||
4e5ab4cb JM |
56 | static int __init selinux_compat_net_setup(char *str) |
57 | { | |
58 | selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0; | |
59 | return 1; | |
60 | } | |
61 | __setup("selinux_compat_net=", selinux_compat_net_setup); | |
62 | ||
1da177e4 | 63 | |
bb003079 | 64 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
65 | |
66 | /* global data for booleans */ | |
67 | static struct dentry *bool_dir = NULL; | |
68 | static int bool_num = 0; | |
69 | static int *bool_pending_values = NULL; | |
70 | ||
71 | extern void selnl_notify_setenforce(int val); | |
72 | ||
73 | /* Check whether a task is allowed to use a security operation. */ | |
74 | static int task_has_security(struct task_struct *tsk, | |
75 | u32 perms) | |
76 | { | |
77 | struct task_security_struct *tsec; | |
78 | ||
79 | tsec = tsk->security; | |
80 | if (!tsec) | |
81 | return -EACCES; | |
82 | ||
83 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, | |
84 | SECCLASS_SECURITY, perms, NULL); | |
85 | } | |
86 | ||
87 | enum sel_inos { | |
88 | SEL_ROOT_INO = 2, | |
89 | SEL_LOAD, /* load policy */ | |
90 | SEL_ENFORCE, /* get or set enforcing status */ | |
91 | SEL_CONTEXT, /* validate context */ | |
92 | SEL_ACCESS, /* compute access decision */ | |
93 | SEL_CREATE, /* compute create labeling decision */ | |
94 | SEL_RELABEL, /* compute relabeling decision */ | |
95 | SEL_USER, /* compute reachable user contexts */ | |
96 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
97 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
98 | SEL_MLS, /* return if MLS policy is enabled */ | |
99 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
100 | SEL_AVC, /* AVC management directory */ | |
101 | SEL_MEMBER, /* compute polyinstantiation membership decision */ | |
102 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 103 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
1da177e4 LT |
104 | }; |
105 | ||
106 | #define TMPBUFLEN 12 | |
107 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
108 | size_t count, loff_t *ppos) | |
109 | { | |
110 | char tmpbuf[TMPBUFLEN]; | |
111 | ssize_t length; | |
112 | ||
113 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
114 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
115 | } | |
116 | ||
117 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
118 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, | |
119 | size_t count, loff_t *ppos) | |
120 | ||
121 | { | |
122 | char *page; | |
123 | ssize_t length; | |
124 | int new_value; | |
125 | ||
bfd51626 | 126 | if (count >= PAGE_SIZE) |
1da177e4 LT |
127 | return -ENOMEM; |
128 | if (*ppos != 0) { | |
129 | /* No partial writes. */ | |
130 | return -EINVAL; | |
131 | } | |
132 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
133 | if (!page) | |
134 | return -ENOMEM; | |
135 | length = -EFAULT; | |
136 | if (copy_from_user(page, buf, count)) | |
137 | goto out; | |
138 | ||
139 | length = -EINVAL; | |
140 | if (sscanf(page, "%d", &new_value) != 1) | |
141 | goto out; | |
142 | ||
143 | if (new_value != selinux_enforcing) { | |
144 | length = task_has_security(current, SECURITY__SETENFORCE); | |
145 | if (length) | |
146 | goto out; | |
af601e46 SG |
147 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
148 | "enforcing=%d old_enforcing=%d auid=%u", new_value, | |
149 | selinux_enforcing, | |
150 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
151 | selinux_enforcing = new_value; |
152 | if (selinux_enforcing) | |
153 | avc_ss_reset(0); | |
154 | selnl_notify_setenforce(selinux_enforcing); | |
155 | } | |
156 | length = count; | |
157 | out: | |
158 | free_page((unsigned long) page); | |
159 | return length; | |
160 | } | |
161 | #else | |
162 | #define sel_write_enforce NULL | |
163 | #endif | |
164 | ||
165 | static struct file_operations sel_enforce_ops = { | |
166 | .read = sel_read_enforce, | |
167 | .write = sel_write_enforce, | |
168 | }; | |
169 | ||
170 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
171 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, | |
172 | size_t count, loff_t *ppos) | |
173 | ||
174 | { | |
175 | char *page; | |
176 | ssize_t length; | |
177 | int new_value; | |
178 | extern int selinux_disable(void); | |
179 | ||
bfd51626 | 180 | if (count >= PAGE_SIZE) |
1da177e4 LT |
181 | return -ENOMEM; |
182 | if (*ppos != 0) { | |
183 | /* No partial writes. */ | |
184 | return -EINVAL; | |
185 | } | |
186 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
187 | if (!page) | |
188 | return -ENOMEM; | |
189 | length = -EFAULT; | |
190 | if (copy_from_user(page, buf, count)) | |
191 | goto out; | |
192 | ||
193 | length = -EINVAL; | |
194 | if (sscanf(page, "%d", &new_value) != 1) | |
195 | goto out; | |
196 | ||
197 | if (new_value) { | |
198 | length = selinux_disable(); | |
199 | if (length < 0) | |
200 | goto out; | |
af601e46 SG |
201 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
202 | "selinux=0 auid=%u", | |
203 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
204 | } |
205 | ||
206 | length = count; | |
207 | out: | |
208 | free_page((unsigned long) page); | |
209 | return length; | |
210 | } | |
211 | #else | |
212 | #define sel_write_disable NULL | |
213 | #endif | |
214 | ||
215 | static struct file_operations sel_disable_ops = { | |
216 | .write = sel_write_disable, | |
217 | }; | |
218 | ||
219 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
220 | size_t count, loff_t *ppos) | |
221 | { | |
222 | char tmpbuf[TMPBUFLEN]; | |
223 | ssize_t length; | |
224 | ||
225 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
226 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
227 | } | |
228 | ||
229 | static struct file_operations sel_policyvers_ops = { | |
230 | .read = sel_read_policyvers, | |
231 | }; | |
232 | ||
233 | /* declaration for sel_write_load */ | |
234 | static int sel_make_bools(void); | |
235 | ||
236 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
237 | size_t count, loff_t *ppos) | |
238 | { | |
239 | char tmpbuf[TMPBUFLEN]; | |
240 | ssize_t length; | |
241 | ||
242 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); | |
243 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
244 | } | |
245 | ||
246 | static struct file_operations sel_mls_ops = { | |
247 | .read = sel_read_mls, | |
248 | }; | |
249 | ||
250 | static ssize_t sel_write_load(struct file * file, const char __user * buf, | |
251 | size_t count, loff_t *ppos) | |
252 | ||
253 | { | |
254 | int ret; | |
255 | ssize_t length; | |
256 | void *data = NULL; | |
257 | ||
bb003079 | 258 | mutex_lock(&sel_mutex); |
1da177e4 LT |
259 | |
260 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
261 | if (length) | |
262 | goto out; | |
263 | ||
264 | if (*ppos != 0) { | |
265 | /* No partial writes. */ | |
266 | length = -EINVAL; | |
267 | goto out; | |
268 | } | |
269 | ||
bfd51626 | 270 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
271 | || (data = vmalloc(count)) == NULL) { |
272 | length = -ENOMEM; | |
273 | goto out; | |
274 | } | |
275 | ||
276 | length = -EFAULT; | |
277 | if (copy_from_user(data, buf, count) != 0) | |
278 | goto out; | |
279 | ||
280 | length = security_load_policy(data, count); | |
281 | if (length) | |
282 | goto out; | |
283 | ||
284 | ret = sel_make_bools(); | |
285 | if (ret) | |
286 | length = ret; | |
287 | else | |
288 | length = count; | |
af601e46 SG |
289 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
290 | "policy loaded auid=%u", | |
291 | audit_get_loginuid(current->audit_context)); | |
1da177e4 | 292 | out: |
bb003079 | 293 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
294 | vfree(data); |
295 | return length; | |
296 | } | |
297 | ||
298 | static struct file_operations sel_load_ops = { | |
299 | .write = sel_write_load, | |
300 | }; | |
301 | ||
ce9982d0 | 302 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
1da177e4 | 303 | { |
ce9982d0 SS |
304 | char *canon; |
305 | u32 sid, len; | |
1da177e4 LT |
306 | ssize_t length; |
307 | ||
308 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
309 | if (length) | |
310 | return length; | |
311 | ||
ce9982d0 SS |
312 | length = security_context_to_sid(buf, size, &sid); |
313 | if (length < 0) | |
314 | return length; | |
1da177e4 | 315 | |
ce9982d0 | 316 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 317 | if (length < 0) |
ce9982d0 SS |
318 | return length; |
319 | ||
320 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
321 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
322 | "max\n", __FUNCTION__, len); | |
323 | length = -ERANGE; | |
1da177e4 | 324 | goto out; |
ce9982d0 | 325 | } |
1da177e4 | 326 | |
ce9982d0 SS |
327 | memcpy(buf, canon, len); |
328 | length = len; | |
1da177e4 | 329 | out: |
ce9982d0 | 330 | kfree(canon); |
1da177e4 LT |
331 | return length; |
332 | } | |
333 | ||
1da177e4 LT |
334 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
335 | size_t count, loff_t *ppos) | |
336 | { | |
337 | char tmpbuf[TMPBUFLEN]; | |
338 | ssize_t length; | |
339 | ||
340 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
341 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
342 | } | |
343 | ||
344 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
345 | size_t count, loff_t *ppos) | |
346 | { | |
347 | char *page; | |
348 | ssize_t length; | |
349 | unsigned int new_value; | |
350 | ||
351 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
352 | if (length) | |
353 | return length; | |
354 | ||
bfd51626 | 355 | if (count >= PAGE_SIZE) |
1da177e4 LT |
356 | return -ENOMEM; |
357 | if (*ppos != 0) { | |
358 | /* No partial writes. */ | |
359 | return -EINVAL; | |
360 | } | |
361 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
362 | if (!page) | |
363 | return -ENOMEM; | |
364 | length = -EFAULT; | |
365 | if (copy_from_user(page, buf, count)) | |
366 | goto out; | |
367 | ||
368 | length = -EINVAL; | |
369 | if (sscanf(page, "%u", &new_value) != 1) | |
370 | goto out; | |
371 | ||
372 | selinux_checkreqprot = new_value ? 1 : 0; | |
373 | length = count; | |
374 | out: | |
375 | free_page((unsigned long) page); | |
376 | return length; | |
377 | } | |
378 | static struct file_operations sel_checkreqprot_ops = { | |
379 | .read = sel_read_checkreqprot, | |
380 | .write = sel_write_checkreqprot, | |
381 | }; | |
382 | ||
4e5ab4cb JM |
383 | static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, |
384 | size_t count, loff_t *ppos) | |
385 | { | |
386 | char tmpbuf[TMPBUFLEN]; | |
387 | ssize_t length; | |
388 | ||
389 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); | |
390 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
391 | } | |
392 | ||
393 | static ssize_t sel_write_compat_net(struct file * file, const char __user * buf, | |
394 | size_t count, loff_t *ppos) | |
395 | { | |
396 | char *page; | |
397 | ssize_t length; | |
398 | int new_value; | |
399 | ||
400 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
401 | if (length) | |
402 | return length; | |
403 | ||
404 | if (count >= PAGE_SIZE) | |
405 | return -ENOMEM; | |
406 | if (*ppos != 0) { | |
407 | /* No partial writes. */ | |
408 | return -EINVAL; | |
409 | } | |
410 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
411 | if (!page) | |
412 | return -ENOMEM; | |
413 | length = -EFAULT; | |
414 | if (copy_from_user(page, buf, count)) | |
415 | goto out; | |
416 | ||
417 | length = -EINVAL; | |
418 | if (sscanf(page, "%d", &new_value) != 1) | |
419 | goto out; | |
420 | ||
421 | selinux_compat_net = new_value ? 1 : 0; | |
422 | length = count; | |
423 | out: | |
424 | free_page((unsigned long) page); | |
425 | return length; | |
426 | } | |
427 | static struct file_operations sel_compat_net_ops = { | |
428 | .read = sel_read_compat_net, | |
429 | .write = sel_write_compat_net, | |
430 | }; | |
431 | ||
1da177e4 LT |
432 | /* |
433 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
434 | */ | |
435 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
436 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
437 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
438 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
439 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
440 | ||
441 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
442 | [SEL_ACCESS] = sel_write_access, | |
443 | [SEL_CREATE] = sel_write_create, | |
444 | [SEL_RELABEL] = sel_write_relabel, | |
445 | [SEL_USER] = sel_write_user, | |
446 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 447 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
448 | }; |
449 | ||
450 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
451 | { | |
452 | ino_t ino = file->f_dentry->d_inode->i_ino; | |
453 | char *data; | |
454 | ssize_t rv; | |
455 | ||
6e20a64a | 456 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
457 | return -EINVAL; |
458 | ||
459 | data = simple_transaction_get(file, buf, size); | |
460 | if (IS_ERR(data)) | |
461 | return PTR_ERR(data); | |
462 | ||
463 | rv = write_op[ino](file, data, size); | |
464 | if (rv>0) { | |
465 | simple_transaction_set(file, rv); | |
466 | rv = size; | |
467 | } | |
468 | return rv; | |
469 | } | |
470 | ||
471 | static struct file_operations transaction_ops = { | |
472 | .write = selinux_transaction_write, | |
473 | .read = simple_transaction_read, | |
474 | .release = simple_transaction_release, | |
475 | }; | |
476 | ||
477 | /* | |
478 | * payload - write methods | |
479 | * If the method has a response, the response should be put in buf, | |
480 | * and the length returned. Otherwise return 0 or and -error. | |
481 | */ | |
482 | ||
483 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
484 | { | |
485 | char *scon, *tcon; | |
486 | u32 ssid, tsid; | |
487 | u16 tclass; | |
488 | u32 req; | |
489 | struct av_decision avd; | |
490 | ssize_t length; | |
491 | ||
492 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
493 | if (length) | |
494 | return length; | |
495 | ||
496 | length = -ENOMEM; | |
89d155ef | 497 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
498 | if (!scon) |
499 | return length; | |
1da177e4 | 500 | |
89d155ef | 501 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
502 | if (!tcon) |
503 | goto out; | |
1da177e4 LT |
504 | |
505 | length = -EINVAL; | |
506 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
507 | goto out2; | |
508 | ||
509 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
510 | if (length < 0) | |
511 | goto out2; | |
512 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
513 | if (length < 0) | |
514 | goto out2; | |
515 | ||
516 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
517 | if (length < 0) | |
518 | goto out2; | |
519 | ||
520 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
521 | "%x %x %x %x %u", | |
522 | avd.allowed, avd.decided, | |
523 | avd.auditallow, avd.auditdeny, | |
524 | avd.seqno); | |
525 | out2: | |
526 | kfree(tcon); | |
527 | out: | |
528 | kfree(scon); | |
529 | return length; | |
530 | } | |
531 | ||
532 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
533 | { | |
534 | char *scon, *tcon; | |
535 | u32 ssid, tsid, newsid; | |
536 | u16 tclass; | |
537 | ssize_t length; | |
538 | char *newcon; | |
539 | u32 len; | |
540 | ||
541 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
542 | if (length) | |
543 | return length; | |
544 | ||
545 | length = -ENOMEM; | |
89d155ef | 546 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
547 | if (!scon) |
548 | return length; | |
1da177e4 | 549 | |
89d155ef | 550 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
551 | if (!tcon) |
552 | goto out; | |
1da177e4 LT |
553 | |
554 | length = -EINVAL; | |
555 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
556 | goto out2; | |
557 | ||
558 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
559 | if (length < 0) | |
560 | goto out2; | |
561 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
562 | if (length < 0) | |
563 | goto out2; | |
564 | ||
565 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
566 | if (length < 0) | |
567 | goto out2; | |
568 | ||
569 | length = security_sid_to_context(newsid, &newcon, &len); | |
570 | if (length < 0) | |
571 | goto out2; | |
572 | ||
573 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
574 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
575 | "max\n", __FUNCTION__, len); | |
576 | length = -ERANGE; | |
577 | goto out3; | |
578 | } | |
579 | ||
580 | memcpy(buf, newcon, len); | |
581 | length = len; | |
582 | out3: | |
583 | kfree(newcon); | |
584 | out2: | |
585 | kfree(tcon); | |
586 | out: | |
587 | kfree(scon); | |
588 | return length; | |
589 | } | |
590 | ||
591 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
592 | { | |
593 | char *scon, *tcon; | |
594 | u32 ssid, tsid, newsid; | |
595 | u16 tclass; | |
596 | ssize_t length; | |
597 | char *newcon; | |
598 | u32 len; | |
599 | ||
600 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
601 | if (length) | |
602 | return length; | |
603 | ||
604 | length = -ENOMEM; | |
89d155ef | 605 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
606 | if (!scon) |
607 | return length; | |
1da177e4 | 608 | |
89d155ef | 609 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
610 | if (!tcon) |
611 | goto out; | |
1da177e4 LT |
612 | |
613 | length = -EINVAL; | |
614 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
615 | goto out2; | |
616 | ||
617 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
618 | if (length < 0) | |
619 | goto out2; | |
620 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
621 | if (length < 0) | |
622 | goto out2; | |
623 | ||
624 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
625 | if (length < 0) | |
626 | goto out2; | |
627 | ||
628 | length = security_sid_to_context(newsid, &newcon, &len); | |
629 | if (length < 0) | |
630 | goto out2; | |
631 | ||
632 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
633 | length = -ERANGE; | |
634 | goto out3; | |
635 | } | |
636 | ||
637 | memcpy(buf, newcon, len); | |
638 | length = len; | |
639 | out3: | |
640 | kfree(newcon); | |
641 | out2: | |
642 | kfree(tcon); | |
643 | out: | |
644 | kfree(scon); | |
645 | return length; | |
646 | } | |
647 | ||
648 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
649 | { | |
650 | char *con, *user, *ptr; | |
651 | u32 sid, *sids; | |
652 | ssize_t length; | |
653 | char *newcon; | |
654 | int i, rc; | |
655 | u32 len, nsids; | |
656 | ||
657 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
658 | if (length) | |
659 | return length; | |
660 | ||
661 | length = -ENOMEM; | |
89d155ef | 662 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
663 | if (!con) |
664 | return length; | |
1da177e4 | 665 | |
89d155ef | 666 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
667 | if (!user) |
668 | goto out; | |
1da177e4 LT |
669 | |
670 | length = -EINVAL; | |
671 | if (sscanf(buf, "%s %s", con, user) != 2) | |
672 | goto out2; | |
673 | ||
674 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
675 | if (length < 0) | |
676 | goto out2; | |
677 | ||
678 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
679 | if (length < 0) | |
680 | goto out2; | |
681 | ||
682 | length = sprintf(buf, "%u", nsids) + 1; | |
683 | ptr = buf + length; | |
684 | for (i = 0; i < nsids; i++) { | |
685 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
686 | if (rc) { | |
687 | length = rc; | |
688 | goto out3; | |
689 | } | |
690 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
691 | kfree(newcon); | |
692 | length = -ERANGE; | |
693 | goto out3; | |
694 | } | |
695 | memcpy(ptr, newcon, len); | |
696 | kfree(newcon); | |
697 | ptr += len; | |
698 | length += len; | |
699 | } | |
700 | out3: | |
701 | kfree(sids); | |
702 | out2: | |
703 | kfree(user); | |
704 | out: | |
705 | kfree(con); | |
706 | return length; | |
707 | } | |
708 | ||
709 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
710 | { | |
711 | char *scon, *tcon; | |
712 | u32 ssid, tsid, newsid; | |
713 | u16 tclass; | |
714 | ssize_t length; | |
715 | char *newcon; | |
716 | u32 len; | |
717 | ||
718 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
719 | if (length) | |
720 | return length; | |
721 | ||
722 | length = -ENOMEM; | |
89d155ef | 723 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
724 | if (!scon) |
725 | return length; | |
1da177e4 | 726 | |
89d155ef | 727 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
728 | if (!tcon) |
729 | goto out; | |
1da177e4 LT |
730 | |
731 | length = -EINVAL; | |
732 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
733 | goto out2; | |
734 | ||
735 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
736 | if (length < 0) | |
737 | goto out2; | |
738 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
739 | if (length < 0) | |
740 | goto out2; | |
741 | ||
742 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
743 | if (length < 0) | |
744 | goto out2; | |
745 | ||
746 | length = security_sid_to_context(newsid, &newcon, &len); | |
747 | if (length < 0) | |
748 | goto out2; | |
749 | ||
750 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
751 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
752 | "max\n", __FUNCTION__, len); | |
753 | length = -ERANGE; | |
754 | goto out3; | |
755 | } | |
756 | ||
757 | memcpy(buf, newcon, len); | |
758 | length = len; | |
759 | out3: | |
760 | kfree(newcon); | |
761 | out2: | |
762 | kfree(tcon); | |
763 | out: | |
764 | kfree(scon); | |
765 | return length; | |
766 | } | |
767 | ||
768 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
769 | { | |
770 | struct inode *ret = new_inode(sb); | |
771 | ||
772 | if (ret) { | |
773 | ret->i_mode = mode; | |
774 | ret->i_uid = ret->i_gid = 0; | |
775 | ret->i_blksize = PAGE_CACHE_SIZE; | |
776 | ret->i_blocks = 0; | |
777 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
778 | } | |
779 | return ret; | |
780 | } | |
781 | ||
782 | #define BOOL_INO_OFFSET 30 | |
783 | ||
784 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, | |
785 | size_t count, loff_t *ppos) | |
786 | { | |
787 | char *page = NULL; | |
788 | ssize_t length; | |
1da177e4 LT |
789 | ssize_t ret; |
790 | int cur_enforcing; | |
791 | struct inode *inode; | |
792 | ||
bb003079 | 793 | mutex_lock(&sel_mutex); |
1da177e4 LT |
794 | |
795 | ret = -EFAULT; | |
796 | ||
797 | /* check to see if this file has been deleted */ | |
798 | if (!filep->f_op) | |
799 | goto out; | |
800 | ||
bfd51626 | 801 | if (count > PAGE_SIZE) { |
1da177e4 LT |
802 | ret = -EINVAL; |
803 | goto out; | |
804 | } | |
805 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
806 | ret = -ENOMEM; | |
807 | goto out; | |
808 | } | |
809 | ||
810 | inode = filep->f_dentry->d_inode; | |
811 | cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET); | |
812 | if (cur_enforcing < 0) { | |
813 | ret = cur_enforcing; | |
814 | goto out; | |
815 | } | |
816 | ||
817 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
818 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]); | |
68bdcf28 | 819 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 820 | out: |
bb003079 | 821 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
822 | if (page) |
823 | free_page((unsigned long)page); | |
824 | return ret; | |
825 | } | |
826 | ||
827 | static ssize_t sel_write_bool(struct file *filep, 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 | struct inode *inode; | |
834 | ||
bb003079 | 835 | mutex_lock(&sel_mutex); |
1da177e4 LT |
836 | |
837 | length = task_has_security(current, SECURITY__SETBOOL); | |
838 | if (length) | |
839 | goto out; | |
840 | ||
841 | /* check to see if this file has been deleted */ | |
842 | if (!filep->f_op) | |
843 | goto out; | |
844 | ||
bfd51626 | 845 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
846 | length = -ENOMEM; |
847 | goto out; | |
848 | } | |
849 | if (*ppos != 0) { | |
850 | /* No partial writes. */ | |
851 | goto out; | |
852 | } | |
853 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
854 | if (!page) { | |
855 | length = -ENOMEM; | |
856 | goto out; | |
857 | } | |
858 | ||
859 | if (copy_from_user(page, buf, count)) | |
860 | goto out; | |
861 | ||
862 | length = -EINVAL; | |
863 | if (sscanf(page, "%d", &new_value) != 1) | |
864 | goto out; | |
865 | ||
866 | if (new_value) | |
867 | new_value = 1; | |
868 | ||
869 | inode = filep->f_dentry->d_inode; | |
870 | bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value; | |
871 | length = count; | |
872 | ||
873 | out: | |
bb003079 | 874 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
875 | if (page) |
876 | free_page((unsigned long) page); | |
877 | return length; | |
878 | } | |
879 | ||
880 | static struct file_operations sel_bool_ops = { | |
881 | .read = sel_read_bool, | |
882 | .write = sel_write_bool, | |
883 | }; | |
884 | ||
885 | static ssize_t sel_commit_bools_write(struct file *filep, | |
886 | const char __user *buf, | |
887 | size_t count, loff_t *ppos) | |
888 | { | |
889 | char *page = NULL; | |
890 | ssize_t length = -EFAULT; | |
891 | int new_value; | |
892 | ||
bb003079 | 893 | mutex_lock(&sel_mutex); |
1da177e4 LT |
894 | |
895 | length = task_has_security(current, SECURITY__SETBOOL); | |
896 | if (length) | |
897 | goto out; | |
898 | ||
899 | /* check to see if this file has been deleted */ | |
900 | if (!filep->f_op) | |
901 | goto out; | |
902 | ||
bfd51626 | 903 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
904 | length = -ENOMEM; |
905 | goto out; | |
906 | } | |
907 | if (*ppos != 0) { | |
908 | /* No partial writes. */ | |
909 | goto out; | |
910 | } | |
911 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
912 | if (!page) { | |
913 | length = -ENOMEM; | |
914 | goto out; | |
915 | } | |
916 | ||
917 | if (copy_from_user(page, buf, count)) | |
918 | goto out; | |
919 | ||
920 | length = -EINVAL; | |
921 | if (sscanf(page, "%d", &new_value) != 1) | |
922 | goto out; | |
923 | ||
20c19e41 | 924 | if (new_value && bool_pending_values) { |
1da177e4 LT |
925 | security_set_bools(bool_num, bool_pending_values); |
926 | } | |
927 | ||
928 | length = count; | |
929 | ||
930 | out: | |
bb003079 | 931 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
932 | if (page) |
933 | free_page((unsigned long) page); | |
934 | return length; | |
935 | } | |
936 | ||
937 | static struct file_operations sel_commit_bools_ops = { | |
938 | .write = sel_commit_bools_write, | |
939 | }; | |
940 | ||
941 | /* delete booleans - partial revoke() from | |
942 | * fs/proc/generic.c proc_kill_inodes */ | |
943 | static void sel_remove_bools(struct dentry *de) | |
944 | { | |
945 | struct list_head *p, *node; | |
946 | struct super_block *sb = de->d_sb; | |
947 | ||
948 | spin_lock(&dcache_lock); | |
949 | node = de->d_subdirs.next; | |
950 | while (node != &de->d_subdirs) { | |
5160ee6f | 951 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
952 | list_del_init(node); |
953 | ||
954 | if (d->d_inode) { | |
955 | d = dget_locked(d); | |
956 | spin_unlock(&dcache_lock); | |
957 | d_delete(d); | |
958 | simple_unlink(de->d_inode, d); | |
959 | dput(d); | |
960 | spin_lock(&dcache_lock); | |
961 | } | |
962 | node = de->d_subdirs.next; | |
963 | } | |
964 | ||
965 | spin_unlock(&dcache_lock); | |
966 | ||
967 | file_list_lock(); | |
968 | list_for_each(p, &sb->s_files) { | |
2f512016 | 969 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
1da177e4 LT |
970 | struct dentry * dentry = filp->f_dentry; |
971 | ||
972 | if (dentry->d_parent != de) { | |
973 | continue; | |
974 | } | |
975 | filp->f_op = NULL; | |
976 | } | |
977 | file_list_unlock(); | |
978 | } | |
979 | ||
980 | #define BOOL_DIR_NAME "booleans" | |
981 | ||
982 | static int sel_make_bools(void) | |
983 | { | |
984 | int i, ret = 0; | |
985 | ssize_t len; | |
986 | struct dentry *dentry = NULL; | |
987 | struct dentry *dir = bool_dir; | |
988 | struct inode *inode = NULL; | |
989 | struct inode_security_struct *isec; | |
990 | char **names = NULL, *page; | |
991 | int num; | |
992 | int *values = NULL; | |
993 | u32 sid; | |
994 | ||
995 | /* remove any existing files */ | |
9a5f04bf | 996 | kfree(bool_pending_values); |
20c19e41 | 997 | bool_pending_values = NULL; |
1da177e4 LT |
998 | |
999 | sel_remove_bools(dir); | |
1000 | ||
1001 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
1002 | return -ENOMEM; | |
1003 | ||
1004 | ret = security_get_bools(&num, &names, &values); | |
1005 | if (ret != 0) | |
1006 | goto out; | |
1007 | ||
1008 | for (i = 0; i < num; i++) { | |
1009 | dentry = d_alloc_name(dir, names[i]); | |
1010 | if (!dentry) { | |
1011 | ret = -ENOMEM; | |
1012 | goto err; | |
1013 | } | |
1014 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
1015 | if (!inode) { | |
1016 | ret = -ENOMEM; | |
1017 | goto err; | |
1018 | } | |
1019 | ||
1020 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1021 | if (len < 0) { | |
1022 | ret = -EINVAL; | |
1023 | goto err; | |
1024 | } else if (len >= PAGE_SIZE) { | |
1025 | ret = -ENAMETOOLONG; | |
1026 | goto err; | |
1027 | } | |
1028 | isec = (struct inode_security_struct*)inode->i_security; | |
1029 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
1030 | goto err; | |
1031 | isec->sid = sid; | |
1032 | isec->initialized = 1; | |
1033 | inode->i_fop = &sel_bool_ops; | |
1034 | inode->i_ino = i + BOOL_INO_OFFSET; | |
1035 | d_add(dentry, inode); | |
1036 | } | |
1037 | bool_num = num; | |
1038 | bool_pending_values = values; | |
1039 | out: | |
1040 | free_page((unsigned long)page); | |
1041 | if (names) { | |
9a5f04bf JJ |
1042 | for (i = 0; i < num; i++) |
1043 | kfree(names[i]); | |
1da177e4 LT |
1044 | kfree(names); |
1045 | } | |
1046 | return ret; | |
1047 | err: | |
20c19e41 | 1048 | kfree(values); |
253a8b1d | 1049 | sel_remove_bools(dir); |
1da177e4 LT |
1050 | ret = -ENOMEM; |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | #define NULL_FILE_NAME "null" | |
1055 | ||
1056 | struct dentry *selinux_null = NULL; | |
1057 | ||
1058 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1059 | size_t count, loff_t *ppos) | |
1060 | { | |
1061 | char tmpbuf[TMPBUFLEN]; | |
1062 | ssize_t length; | |
1063 | ||
1064 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1065 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1066 | } | |
1067 | ||
1068 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1069 | const char __user * buf, | |
1070 | size_t count, loff_t *ppos) | |
1071 | ||
1072 | { | |
1073 | char *page; | |
1074 | ssize_t ret; | |
1075 | int new_value; | |
1076 | ||
bfd51626 | 1077 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1078 | ret = -ENOMEM; |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | if (*ppos != 0) { | |
1083 | /* No partial writes. */ | |
1084 | ret = -EINVAL; | |
1085 | goto out; | |
1086 | } | |
1087 | ||
1088 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1089 | if (!page) { | |
1090 | ret = -ENOMEM; | |
1091 | goto out; | |
1092 | } | |
1093 | ||
1094 | if (copy_from_user(page, buf, count)) { | |
1095 | ret = -EFAULT; | |
1096 | goto out_free; | |
1097 | } | |
1098 | ||
1099 | if (sscanf(page, "%u", &new_value) != 1) { | |
1100 | ret = -EINVAL; | |
1101 | goto out; | |
1102 | } | |
1103 | ||
1104 | if (new_value != avc_cache_threshold) { | |
1105 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1106 | if (ret) | |
1107 | goto out_free; | |
1108 | avc_cache_threshold = new_value; | |
1109 | } | |
1110 | ret = count; | |
1111 | out_free: | |
1112 | free_page((unsigned long)page); | |
1113 | out: | |
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1118 | size_t count, loff_t *ppos) | |
1119 | { | |
1120 | char *page; | |
1121 | ssize_t ret = 0; | |
1122 | ||
1123 | page = (char *)__get_free_page(GFP_KERNEL); | |
1124 | if (!page) { | |
1125 | ret = -ENOMEM; | |
1126 | goto out; | |
1127 | } | |
1128 | ret = avc_get_hash_stats(page); | |
1129 | if (ret >= 0) | |
1130 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1131 | free_page((unsigned long)page); | |
1132 | out: | |
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static struct file_operations sel_avc_cache_threshold_ops = { | |
1137 | .read = sel_read_avc_cache_threshold, | |
1138 | .write = sel_write_avc_cache_threshold, | |
1139 | }; | |
1140 | ||
1141 | static struct file_operations sel_avc_hash_stats_ops = { | |
1142 | .read = sel_read_avc_hash_stats, | |
1143 | }; | |
1144 | ||
1145 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1146 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1147 | { | |
1148 | int cpu; | |
1149 | ||
1150 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1151 | if (!cpu_possible(cpu)) | |
1152 | continue; | |
1153 | *idx = cpu + 1; | |
1154 | return &per_cpu(avc_cache_stats, cpu); | |
1155 | } | |
1156 | return NULL; | |
1157 | } | |
1158 | ||
1159 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1160 | { | |
1161 | loff_t n = *pos - 1; | |
1162 | ||
1163 | if (*pos == 0) | |
1164 | return SEQ_START_TOKEN; | |
1165 | ||
1166 | return sel_avc_get_stat_idx(&n); | |
1167 | } | |
1168 | ||
1169 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1170 | { | |
1171 | return sel_avc_get_stat_idx(pos); | |
1172 | } | |
1173 | ||
1174 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1175 | { | |
1176 | struct avc_cache_stats *st = v; | |
1177 | ||
1178 | if (v == SEQ_START_TOKEN) | |
1179 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1180 | "frees\n"); | |
1181 | else | |
1182 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1183 | st->hits, st->misses, st->allocations, | |
1184 | st->reclaims, st->frees); | |
1185 | return 0; | |
1186 | } | |
1187 | ||
1188 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1189 | { } | |
1190 | ||
1191 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1192 | .start = sel_avc_stats_seq_start, | |
1193 | .next = sel_avc_stats_seq_next, | |
1194 | .show = sel_avc_stats_seq_show, | |
1195 | .stop = sel_avc_stats_seq_stop, | |
1196 | }; | |
1197 | ||
1198 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1199 | { | |
1200 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1201 | } | |
1202 | ||
1203 | static struct file_operations sel_avc_cache_stats_ops = { | |
1204 | .open = sel_open_avc_cache_stats, | |
1205 | .read = seq_read, | |
1206 | .llseek = seq_lseek, | |
1207 | .release = seq_release, | |
1208 | }; | |
1209 | #endif | |
1210 | ||
1211 | static int sel_make_avc_files(struct dentry *dir) | |
1212 | { | |
1213 | int i, ret = 0; | |
1214 | static struct tree_descr files[] = { | |
1215 | { "cache_threshold", | |
1216 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1217 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1218 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1219 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1220 | #endif | |
1221 | }; | |
1222 | ||
6e20a64a | 1223 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1224 | struct inode *inode; |
1225 | struct dentry *dentry; | |
1226 | ||
1227 | dentry = d_alloc_name(dir, files[i].name); | |
1228 | if (!dentry) { | |
1229 | ret = -ENOMEM; | |
d6aafa65 | 1230 | goto out; |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1234 | if (!inode) { | |
1235 | ret = -ENOMEM; | |
d6aafa65 | 1236 | goto out; |
1da177e4 LT |
1237 | } |
1238 | inode->i_fop = files[i].ops; | |
1239 | d_add(dentry, inode); | |
1240 | } | |
1241 | out: | |
1242 | return ret; | |
1da177e4 LT |
1243 | } |
1244 | ||
edb20fb5 | 1245 | static int sel_make_dir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1246 | { |
1247 | int ret = 0; | |
1248 | struct inode *inode; | |
1249 | ||
edb20fb5 | 1250 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
1da177e4 LT |
1251 | if (!inode) { |
1252 | ret = -ENOMEM; | |
1253 | goto out; | |
1254 | } | |
1255 | inode->i_op = &simple_dir_inode_operations; | |
1256 | inode->i_fop = &simple_dir_operations; | |
40e906f8 JM |
1257 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
1258 | inode->i_nlink++; | |
1da177e4 | 1259 | d_add(dentry, inode); |
edb20fb5 JM |
1260 | /* bump link count on parent directory, too */ |
1261 | dir->i_nlink++; | |
1da177e4 LT |
1262 | out: |
1263 | return ret; | |
1264 | } | |
1265 | ||
1266 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1267 | { | |
1268 | int ret; | |
1269 | struct dentry *dentry; | |
edb20fb5 | 1270 | struct inode *inode, *root_inode; |
1da177e4 LT |
1271 | struct inode_security_struct *isec; |
1272 | ||
1273 | static struct tree_descr selinux_files[] = { | |
1274 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1275 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1276 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1277 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1278 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1279 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1280 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1281 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1282 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1283 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1284 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1285 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1286 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
4e5ab4cb | 1287 | [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, |
1da177e4 LT |
1288 | /* last one */ {""} |
1289 | }; | |
1290 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1291 | if (ret) | |
161ce45a | 1292 | goto err; |
1da177e4 | 1293 | |
edb20fb5 JM |
1294 | root_inode = sb->s_root->d_inode; |
1295 | ||
1da177e4 | 1296 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
161ce45a JM |
1297 | if (!dentry) { |
1298 | ret = -ENOMEM; | |
1299 | goto err; | |
1300 | } | |
1da177e4 | 1301 | |
edb20fb5 | 1302 | ret = sel_make_dir(root_inode, dentry); |
cde174a8 | 1303 | if (ret) |
161ce45a | 1304 | goto err; |
cde174a8 | 1305 | |
1da177e4 | 1306 | bool_dir = dentry; |
1da177e4 LT |
1307 | |
1308 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
161ce45a JM |
1309 | if (!dentry) { |
1310 | ret = -ENOMEM; | |
1311 | goto err; | |
1312 | } | |
1da177e4 LT |
1313 | |
1314 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
161ce45a JM |
1315 | if (!inode) { |
1316 | ret = -ENOMEM; | |
1317 | goto err; | |
1318 | } | |
1da177e4 LT |
1319 | isec = (struct inode_security_struct*)inode->i_security; |
1320 | isec->sid = SECINITSID_DEVNULL; | |
1321 | isec->sclass = SECCLASS_CHR_FILE; | |
1322 | isec->initialized = 1; | |
1323 | ||
1324 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1325 | d_add(dentry, inode); | |
1326 | selinux_null = dentry; | |
1327 | ||
1328 | dentry = d_alloc_name(sb->s_root, "avc"); | |
161ce45a JM |
1329 | if (!dentry) { |
1330 | ret = -ENOMEM; | |
1331 | goto err; | |
1332 | } | |
1da177e4 | 1333 | |
edb20fb5 | 1334 | ret = sel_make_dir(root_inode, dentry); |
1da177e4 | 1335 | if (ret) |
161ce45a | 1336 | goto err; |
1da177e4 LT |
1337 | |
1338 | ret = sel_make_avc_files(dentry); | |
1339 | if (ret) | |
161ce45a | 1340 | goto err; |
1da177e4 | 1341 | out: |
161ce45a JM |
1342 | return ret; |
1343 | err: | |
1da177e4 | 1344 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); |
161ce45a | 1345 | goto out; |
1da177e4 LT |
1346 | } |
1347 | ||
454e2398 DH |
1348 | static int sel_get_sb(struct file_system_type *fs_type, |
1349 | int flags, const char *dev_name, void *data, | |
1350 | struct vfsmount *mnt) | |
1da177e4 | 1351 | { |
454e2398 | 1352 | return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); |
1da177e4 LT |
1353 | } |
1354 | ||
1355 | static struct file_system_type sel_fs_type = { | |
1356 | .name = "selinuxfs", | |
1357 | .get_sb = sel_get_sb, | |
1358 | .kill_sb = kill_litter_super, | |
1359 | }; | |
1360 | ||
1361 | struct vfsmount *selinuxfs_mount; | |
1362 | ||
1363 | static int __init init_sel_fs(void) | |
1364 | { | |
1365 | int err; | |
1366 | ||
1367 | if (!selinux_enabled) | |
1368 | return 0; | |
1369 | err = register_filesystem(&sel_fs_type); | |
1370 | if (!err) { | |
1371 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1372 | if (IS_ERR(selinuxfs_mount)) { | |
1373 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1374 | err = PTR_ERR(selinuxfs_mount); | |
1375 | selinuxfs_mount = NULL; | |
1376 | } | |
1377 | } | |
1378 | return err; | |
1379 | } | |
1380 | ||
1381 | __initcall(init_sel_fs); | |
1382 | ||
1383 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1384 | void exit_sel_fs(void) | |
1385 | { | |
1386 | unregister_filesystem(&sel_fs_type); | |
1387 | } | |
1388 | #endif |