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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 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/fs.h> | |
bb003079 | 17 | #include <linux/mutex.h> |
1da177e4 LT |
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> | |
af601e46 | 24 | #include <linux/audit.h> |
1da177e4 LT |
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 | ||
4e5ab4cb JM |
40 | #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT |
41 | #define SELINUX_COMPAT_NET_VALUE 0 | |
42 | #else | |
43 | #define SELINUX_COMPAT_NET_VALUE 1 | |
44 | #endif | |
45 | ||
46 | int selinux_compat_net = SELINUX_COMPAT_NET_VALUE; | |
47 | ||
1da177e4 LT |
48 | static int __init checkreqprot_setup(char *str) |
49 | { | |
50 | selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0; | |
51 | return 1; | |
52 | } | |
53 | __setup("checkreqprot=", checkreqprot_setup); | |
54 | ||
4e5ab4cb JM |
55 | static int __init selinux_compat_net_setup(char *str) |
56 | { | |
57 | selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0; | |
58 | return 1; | |
59 | } | |
60 | __setup("selinux_compat_net=", selinux_compat_net_setup); | |
61 | ||
1da177e4 | 62 | |
bb003079 | 63 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
64 | |
65 | /* global data for booleans */ | |
66 | static struct dentry *bool_dir = NULL; | |
67 | static int bool_num = 0; | |
68 | static int *bool_pending_values = NULL; | |
69 | ||
70 | extern void selnl_notify_setenforce(int val); | |
71 | ||
72 | /* Check whether a task is allowed to use a security operation. */ | |
73 | static int task_has_security(struct task_struct *tsk, | |
74 | u32 perms) | |
75 | { | |
76 | struct task_security_struct *tsec; | |
77 | ||
78 | tsec = tsk->security; | |
79 | if (!tsec) | |
80 | return -EACCES; | |
81 | ||
82 | return avc_has_perm(tsec->sid, SECINITSID_SECURITY, | |
83 | SECCLASS_SECURITY, perms, NULL); | |
84 | } | |
85 | ||
86 | enum sel_inos { | |
87 | SEL_ROOT_INO = 2, | |
88 | SEL_LOAD, /* load policy */ | |
89 | SEL_ENFORCE, /* get or set enforcing status */ | |
90 | SEL_CONTEXT, /* validate context */ | |
91 | SEL_ACCESS, /* compute access decision */ | |
92 | SEL_CREATE, /* compute create labeling decision */ | |
93 | SEL_RELABEL, /* compute relabeling decision */ | |
94 | SEL_USER, /* compute reachable user contexts */ | |
95 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
96 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
97 | SEL_MLS, /* return if MLS policy is enabled */ | |
98 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
99 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
100 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 101 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
6174eafc | 102 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
103 | }; |
104 | ||
6174eafc JC |
105 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
106 | ||
f0ee2e46 | 107 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
bce34bc0 | 108 | #define SEL_BOOL_INO_OFFSET 0x02000000 |
f0ee2e46 JC |
109 | #define SEL_INO_MASK 0x00ffffff |
110 | ||
1da177e4 LT |
111 | #define TMPBUFLEN 12 |
112 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
113 | size_t count, loff_t *ppos) | |
114 | { | |
115 | char tmpbuf[TMPBUFLEN]; | |
116 | ssize_t length; | |
117 | ||
118 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
119 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
120 | } | |
121 | ||
122 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
123 | static ssize_t sel_write_enforce(struct file * file, const char __user * buf, | |
124 | size_t count, loff_t *ppos) | |
125 | ||
126 | { | |
127 | char *page; | |
128 | ssize_t length; | |
129 | int new_value; | |
130 | ||
bfd51626 | 131 | if (count >= PAGE_SIZE) |
1da177e4 LT |
132 | return -ENOMEM; |
133 | if (*ppos != 0) { | |
134 | /* No partial writes. */ | |
135 | return -EINVAL; | |
136 | } | |
137 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
138 | if (!page) | |
139 | return -ENOMEM; | |
140 | length = -EFAULT; | |
141 | if (copy_from_user(page, buf, count)) | |
142 | goto out; | |
143 | ||
144 | length = -EINVAL; | |
145 | if (sscanf(page, "%d", &new_value) != 1) | |
146 | goto out; | |
147 | ||
148 | if (new_value != selinux_enforcing) { | |
149 | length = task_has_security(current, SECURITY__SETENFORCE); | |
150 | if (length) | |
151 | goto out; | |
af601e46 SG |
152 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
153 | "enforcing=%d old_enforcing=%d auid=%u", new_value, | |
154 | selinux_enforcing, | |
155 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
156 | selinux_enforcing = new_value; |
157 | if (selinux_enforcing) | |
158 | avc_ss_reset(0); | |
159 | selnl_notify_setenforce(selinux_enforcing); | |
160 | } | |
161 | length = count; | |
162 | out: | |
163 | free_page((unsigned long) page); | |
164 | return length; | |
165 | } | |
166 | #else | |
167 | #define sel_write_enforce NULL | |
168 | #endif | |
169 | ||
9c2e08c5 | 170 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
171 | .read = sel_read_enforce, |
172 | .write = sel_write_enforce, | |
173 | }; | |
174 | ||
175 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
176 | static ssize_t sel_write_disable(struct file * file, const char __user * buf, | |
177 | size_t count, loff_t *ppos) | |
178 | ||
179 | { | |
180 | char *page; | |
181 | ssize_t length; | |
182 | int new_value; | |
183 | extern int selinux_disable(void); | |
184 | ||
bfd51626 | 185 | if (count >= PAGE_SIZE) |
1da177e4 LT |
186 | return -ENOMEM; |
187 | if (*ppos != 0) { | |
188 | /* No partial writes. */ | |
189 | return -EINVAL; | |
190 | } | |
191 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
192 | if (!page) | |
193 | return -ENOMEM; | |
194 | length = -EFAULT; | |
195 | if (copy_from_user(page, buf, count)) | |
196 | goto out; | |
197 | ||
198 | length = -EINVAL; | |
199 | if (sscanf(page, "%d", &new_value) != 1) | |
200 | goto out; | |
201 | ||
202 | if (new_value) { | |
203 | length = selinux_disable(); | |
204 | if (length < 0) | |
205 | goto out; | |
af601e46 SG |
206 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
207 | "selinux=0 auid=%u", | |
208 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
209 | } |
210 | ||
211 | length = count; | |
212 | out: | |
213 | free_page((unsigned long) page); | |
214 | return length; | |
215 | } | |
216 | #else | |
217 | #define sel_write_disable NULL | |
218 | #endif | |
219 | ||
9c2e08c5 | 220 | static const struct file_operations sel_disable_ops = { |
1da177e4 LT |
221 | .write = sel_write_disable, |
222 | }; | |
223 | ||
224 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
225 | size_t count, loff_t *ppos) | |
226 | { | |
227 | char tmpbuf[TMPBUFLEN]; | |
228 | ssize_t length; | |
229 | ||
230 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
231 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
232 | } | |
233 | ||
9c2e08c5 | 234 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 LT |
235 | .read = sel_read_policyvers, |
236 | }; | |
237 | ||
238 | /* declaration for sel_write_load */ | |
239 | static int sel_make_bools(void); | |
240 | ||
241 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
242 | size_t count, loff_t *ppos) | |
243 | { | |
244 | char tmpbuf[TMPBUFLEN]; | |
245 | ssize_t length; | |
246 | ||
247 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled); | |
248 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
249 | } | |
250 | ||
9c2e08c5 | 251 | static const struct file_operations sel_mls_ops = { |
1da177e4 LT |
252 | .read = sel_read_mls, |
253 | }; | |
254 | ||
255 | static ssize_t sel_write_load(struct file * file, const char __user * buf, | |
256 | size_t count, loff_t *ppos) | |
257 | ||
258 | { | |
259 | int ret; | |
260 | ssize_t length; | |
261 | void *data = NULL; | |
262 | ||
bb003079 | 263 | mutex_lock(&sel_mutex); |
1da177e4 LT |
264 | |
265 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
266 | if (length) | |
267 | goto out; | |
268 | ||
269 | if (*ppos != 0) { | |
270 | /* No partial writes. */ | |
271 | length = -EINVAL; | |
272 | goto out; | |
273 | } | |
274 | ||
bfd51626 | 275 | if ((count > 64 * 1024 * 1024) |
1da177e4 LT |
276 | || (data = vmalloc(count)) == NULL) { |
277 | length = -ENOMEM; | |
278 | goto out; | |
279 | } | |
280 | ||
281 | length = -EFAULT; | |
282 | if (copy_from_user(data, buf, count) != 0) | |
283 | goto out; | |
284 | ||
285 | length = security_load_policy(data, count); | |
286 | if (length) | |
287 | goto out; | |
288 | ||
289 | ret = sel_make_bools(); | |
290 | if (ret) | |
291 | length = ret; | |
292 | else | |
293 | length = count; | |
af601e46 SG |
294 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
295 | "policy loaded auid=%u", | |
296 | audit_get_loginuid(current->audit_context)); | |
1da177e4 | 297 | out: |
bb003079 | 298 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
299 | vfree(data); |
300 | return length; | |
301 | } | |
302 | ||
9c2e08c5 | 303 | static const struct file_operations sel_load_ops = { |
1da177e4 LT |
304 | .write = sel_write_load, |
305 | }; | |
306 | ||
ce9982d0 | 307 | static ssize_t sel_write_context(struct file * file, char *buf, size_t size) |
1da177e4 | 308 | { |
ce9982d0 SS |
309 | char *canon; |
310 | u32 sid, len; | |
1da177e4 LT |
311 | ssize_t length; |
312 | ||
313 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
314 | if (length) | |
315 | return length; | |
316 | ||
ce9982d0 SS |
317 | length = security_context_to_sid(buf, size, &sid); |
318 | if (length < 0) | |
319 | return length; | |
1da177e4 | 320 | |
ce9982d0 | 321 | length = security_sid_to_context(sid, &canon, &len); |
1da177e4 | 322 | if (length < 0) |
ce9982d0 SS |
323 | return length; |
324 | ||
325 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
326 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
327 | "max\n", __FUNCTION__, len); | |
328 | length = -ERANGE; | |
1da177e4 | 329 | goto out; |
ce9982d0 | 330 | } |
1da177e4 | 331 | |
ce9982d0 SS |
332 | memcpy(buf, canon, len); |
333 | length = len; | |
1da177e4 | 334 | out: |
ce9982d0 | 335 | kfree(canon); |
1da177e4 LT |
336 | return length; |
337 | } | |
338 | ||
1da177e4 LT |
339 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
340 | size_t count, loff_t *ppos) | |
341 | { | |
342 | char tmpbuf[TMPBUFLEN]; | |
343 | ssize_t length; | |
344 | ||
345 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
346 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
347 | } | |
348 | ||
349 | static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf, | |
350 | size_t count, loff_t *ppos) | |
351 | { | |
352 | char *page; | |
353 | ssize_t length; | |
354 | unsigned int new_value; | |
355 | ||
356 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
357 | if (length) | |
358 | return length; | |
359 | ||
bfd51626 | 360 | if (count >= PAGE_SIZE) |
1da177e4 LT |
361 | return -ENOMEM; |
362 | if (*ppos != 0) { | |
363 | /* No partial writes. */ | |
364 | return -EINVAL; | |
365 | } | |
366 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
367 | if (!page) | |
368 | return -ENOMEM; | |
369 | length = -EFAULT; | |
370 | if (copy_from_user(page, buf, count)) | |
371 | goto out; | |
372 | ||
373 | length = -EINVAL; | |
374 | if (sscanf(page, "%u", &new_value) != 1) | |
375 | goto out; | |
376 | ||
377 | selinux_checkreqprot = new_value ? 1 : 0; | |
378 | length = count; | |
379 | out: | |
380 | free_page((unsigned long) page); | |
381 | return length; | |
382 | } | |
9c2e08c5 | 383 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
384 | .read = sel_read_checkreqprot, |
385 | .write = sel_write_checkreqprot, | |
386 | }; | |
387 | ||
4e5ab4cb JM |
388 | static ssize_t sel_read_compat_net(struct file *filp, char __user *buf, |
389 | size_t count, loff_t *ppos) | |
390 | { | |
391 | char tmpbuf[TMPBUFLEN]; | |
392 | ssize_t length; | |
393 | ||
394 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net); | |
395 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
396 | } | |
397 | ||
398 | static ssize_t sel_write_compat_net(struct file * file, const char __user * buf, | |
399 | size_t count, loff_t *ppos) | |
400 | { | |
401 | char *page; | |
402 | ssize_t length; | |
403 | int new_value; | |
404 | ||
405 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
406 | if (length) | |
407 | return length; | |
408 | ||
409 | if (count >= PAGE_SIZE) | |
410 | return -ENOMEM; | |
411 | if (*ppos != 0) { | |
412 | /* No partial writes. */ | |
413 | return -EINVAL; | |
414 | } | |
415 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
416 | if (!page) | |
417 | return -ENOMEM; | |
418 | length = -EFAULT; | |
419 | if (copy_from_user(page, buf, count)) | |
420 | goto out; | |
421 | ||
422 | length = -EINVAL; | |
423 | if (sscanf(page, "%d", &new_value) != 1) | |
424 | goto out; | |
425 | ||
426 | selinux_compat_net = new_value ? 1 : 0; | |
427 | length = count; | |
428 | out: | |
429 | free_page((unsigned long) page); | |
430 | return length; | |
431 | } | |
9c2e08c5 | 432 | static const struct file_operations sel_compat_net_ops = { |
4e5ab4cb JM |
433 | .read = sel_read_compat_net, |
434 | .write = sel_write_compat_net, | |
435 | }; | |
436 | ||
1da177e4 LT |
437 | /* |
438 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
439 | */ | |
440 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size); | |
441 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size); | |
442 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size); | |
443 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size); | |
444 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size); | |
445 | ||
446 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
447 | [SEL_ACCESS] = sel_write_access, | |
448 | [SEL_CREATE] = sel_write_create, | |
449 | [SEL_RELABEL] = sel_write_relabel, | |
450 | [SEL_USER] = sel_write_user, | |
451 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 452 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
453 | }; |
454 | ||
455 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
456 | { | |
3d5ff529 | 457 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
458 | char *data; |
459 | ssize_t rv; | |
460 | ||
6e20a64a | 461 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
462 | return -EINVAL; |
463 | ||
464 | data = simple_transaction_get(file, buf, size); | |
465 | if (IS_ERR(data)) | |
466 | return PTR_ERR(data); | |
467 | ||
468 | rv = write_op[ino](file, data, size); | |
469 | if (rv>0) { | |
470 | simple_transaction_set(file, rv); | |
471 | rv = size; | |
472 | } | |
473 | return rv; | |
474 | } | |
475 | ||
9c2e08c5 | 476 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
477 | .write = selinux_transaction_write, |
478 | .read = simple_transaction_read, | |
479 | .release = simple_transaction_release, | |
480 | }; | |
481 | ||
482 | /* | |
483 | * payload - write methods | |
484 | * If the method has a response, the response should be put in buf, | |
485 | * and the length returned. Otherwise return 0 or and -error. | |
486 | */ | |
487 | ||
488 | static ssize_t sel_write_access(struct file * file, char *buf, size_t size) | |
489 | { | |
490 | char *scon, *tcon; | |
491 | u32 ssid, tsid; | |
492 | u16 tclass; | |
493 | u32 req; | |
494 | struct av_decision avd; | |
495 | ssize_t length; | |
496 | ||
497 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
498 | if (length) | |
499 | return length; | |
500 | ||
501 | length = -ENOMEM; | |
89d155ef | 502 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
503 | if (!scon) |
504 | return length; | |
1da177e4 | 505 | |
89d155ef | 506 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
507 | if (!tcon) |
508 | goto out; | |
1da177e4 LT |
509 | |
510 | length = -EINVAL; | |
511 | if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4) | |
512 | goto out2; | |
513 | ||
514 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
515 | if (length < 0) | |
516 | goto out2; | |
517 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
518 | if (length < 0) | |
519 | goto out2; | |
520 | ||
521 | length = security_compute_av(ssid, tsid, tclass, req, &avd); | |
522 | if (length < 0) | |
523 | goto out2; | |
524 | ||
525 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
526 | "%x %x %x %x %u", | |
527 | avd.allowed, avd.decided, | |
528 | avd.auditallow, avd.auditdeny, | |
529 | avd.seqno); | |
530 | out2: | |
531 | kfree(tcon); | |
532 | out: | |
533 | kfree(scon); | |
534 | return length; | |
535 | } | |
536 | ||
537 | static ssize_t sel_write_create(struct file * file, char *buf, size_t size) | |
538 | { | |
539 | char *scon, *tcon; | |
540 | u32 ssid, tsid, newsid; | |
541 | u16 tclass; | |
542 | ssize_t length; | |
543 | char *newcon; | |
544 | u32 len; | |
545 | ||
546 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
547 | if (length) | |
548 | return length; | |
549 | ||
550 | length = -ENOMEM; | |
89d155ef | 551 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
552 | if (!scon) |
553 | return length; | |
1da177e4 | 554 | |
89d155ef | 555 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
556 | if (!tcon) |
557 | goto out; | |
1da177e4 LT |
558 | |
559 | length = -EINVAL; | |
560 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
561 | goto out2; | |
562 | ||
563 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
564 | if (length < 0) | |
565 | goto out2; | |
566 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
567 | if (length < 0) | |
568 | goto out2; | |
569 | ||
570 | length = security_transition_sid(ssid, tsid, tclass, &newsid); | |
571 | if (length < 0) | |
572 | goto out2; | |
573 | ||
574 | length = security_sid_to_context(newsid, &newcon, &len); | |
575 | if (length < 0) | |
576 | goto out2; | |
577 | ||
578 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
579 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
580 | "max\n", __FUNCTION__, len); | |
581 | length = -ERANGE; | |
582 | goto out3; | |
583 | } | |
584 | ||
585 | memcpy(buf, newcon, len); | |
586 | length = len; | |
587 | out3: | |
588 | kfree(newcon); | |
589 | out2: | |
590 | kfree(tcon); | |
591 | out: | |
592 | kfree(scon); | |
593 | return length; | |
594 | } | |
595 | ||
596 | static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size) | |
597 | { | |
598 | char *scon, *tcon; | |
599 | u32 ssid, tsid, newsid; | |
600 | u16 tclass; | |
601 | ssize_t length; | |
602 | char *newcon; | |
603 | u32 len; | |
604 | ||
605 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
606 | if (length) | |
607 | return length; | |
608 | ||
609 | length = -ENOMEM; | |
89d155ef | 610 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
611 | if (!scon) |
612 | return length; | |
1da177e4 | 613 | |
89d155ef | 614 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
615 | if (!tcon) |
616 | goto out; | |
1da177e4 LT |
617 | |
618 | length = -EINVAL; | |
619 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
620 | goto out2; | |
621 | ||
622 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
623 | if (length < 0) | |
624 | goto out2; | |
625 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
626 | if (length < 0) | |
627 | goto out2; | |
628 | ||
629 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
630 | if (length < 0) | |
631 | goto out2; | |
632 | ||
633 | length = security_sid_to_context(newsid, &newcon, &len); | |
634 | if (length < 0) | |
635 | goto out2; | |
636 | ||
637 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
638 | length = -ERANGE; | |
639 | goto out3; | |
640 | } | |
641 | ||
642 | memcpy(buf, newcon, len); | |
643 | length = len; | |
644 | out3: | |
645 | kfree(newcon); | |
646 | out2: | |
647 | kfree(tcon); | |
648 | out: | |
649 | kfree(scon); | |
650 | return length; | |
651 | } | |
652 | ||
653 | static ssize_t sel_write_user(struct file * file, char *buf, size_t size) | |
654 | { | |
655 | char *con, *user, *ptr; | |
656 | u32 sid, *sids; | |
657 | ssize_t length; | |
658 | char *newcon; | |
659 | int i, rc; | |
660 | u32 len, nsids; | |
661 | ||
662 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
663 | if (length) | |
664 | return length; | |
665 | ||
666 | length = -ENOMEM; | |
89d155ef | 667 | con = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
668 | if (!con) |
669 | return length; | |
1da177e4 | 670 | |
89d155ef | 671 | user = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
672 | if (!user) |
673 | goto out; | |
1da177e4 LT |
674 | |
675 | length = -EINVAL; | |
676 | if (sscanf(buf, "%s %s", con, user) != 2) | |
677 | goto out2; | |
678 | ||
679 | length = security_context_to_sid(con, strlen(con)+1, &sid); | |
680 | if (length < 0) | |
681 | goto out2; | |
682 | ||
683 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
684 | if (length < 0) | |
685 | goto out2; | |
686 | ||
687 | length = sprintf(buf, "%u", nsids) + 1; | |
688 | ptr = buf + length; | |
689 | for (i = 0; i < nsids; i++) { | |
690 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
691 | if (rc) { | |
692 | length = rc; | |
693 | goto out3; | |
694 | } | |
695 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
696 | kfree(newcon); | |
697 | length = -ERANGE; | |
698 | goto out3; | |
699 | } | |
700 | memcpy(ptr, newcon, len); | |
701 | kfree(newcon); | |
702 | ptr += len; | |
703 | length += len; | |
704 | } | |
705 | out3: | |
706 | kfree(sids); | |
707 | out2: | |
708 | kfree(user); | |
709 | out: | |
710 | kfree(con); | |
711 | return length; | |
712 | } | |
713 | ||
714 | static ssize_t sel_write_member(struct file * file, char *buf, size_t size) | |
715 | { | |
716 | char *scon, *tcon; | |
717 | u32 ssid, tsid, newsid; | |
718 | u16 tclass; | |
719 | ssize_t length; | |
720 | char *newcon; | |
721 | u32 len; | |
722 | ||
723 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
724 | if (length) | |
725 | return length; | |
726 | ||
727 | length = -ENOMEM; | |
89d155ef | 728 | scon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
729 | if (!scon) |
730 | return length; | |
1da177e4 | 731 | |
89d155ef | 732 | tcon = kzalloc(size+1, GFP_KERNEL); |
1da177e4 LT |
733 | if (!tcon) |
734 | goto out; | |
1da177e4 LT |
735 | |
736 | length = -EINVAL; | |
737 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
738 | goto out2; | |
739 | ||
740 | length = security_context_to_sid(scon, strlen(scon)+1, &ssid); | |
741 | if (length < 0) | |
742 | goto out2; | |
743 | length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid); | |
744 | if (length < 0) | |
745 | goto out2; | |
746 | ||
747 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
748 | if (length < 0) | |
749 | goto out2; | |
750 | ||
751 | length = security_sid_to_context(newsid, &newcon, &len); | |
752 | if (length < 0) | |
753 | goto out2; | |
754 | ||
755 | if (len > SIMPLE_TRANSACTION_LIMIT) { | |
756 | printk(KERN_ERR "%s: context size (%u) exceeds payload " | |
757 | "max\n", __FUNCTION__, len); | |
758 | length = -ERANGE; | |
759 | goto out3; | |
760 | } | |
761 | ||
762 | memcpy(buf, newcon, len); | |
763 | length = len; | |
764 | out3: | |
765 | kfree(newcon); | |
766 | out2: | |
767 | kfree(tcon); | |
768 | out: | |
769 | kfree(scon); | |
770 | return length; | |
771 | } | |
772 | ||
773 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
774 | { | |
775 | struct inode *ret = new_inode(sb); | |
776 | ||
777 | if (ret) { | |
778 | ret->i_mode = mode; | |
779 | ret->i_uid = ret->i_gid = 0; | |
1da177e4 LT |
780 | ret->i_blocks = 0; |
781 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; | |
782 | } | |
783 | return ret; | |
784 | } | |
785 | ||
1da177e4 LT |
786 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
787 | size_t count, loff_t *ppos) | |
788 | { | |
789 | char *page = NULL; | |
790 | ssize_t length; | |
1da177e4 LT |
791 | ssize_t ret; |
792 | int cur_enforcing; | |
793 | struct inode *inode; | |
794 | ||
bb003079 | 795 | mutex_lock(&sel_mutex); |
1da177e4 LT |
796 | |
797 | ret = -EFAULT; | |
798 | ||
799 | /* check to see if this file has been deleted */ | |
800 | if (!filep->f_op) | |
801 | goto out; | |
802 | ||
bfd51626 | 803 | if (count > PAGE_SIZE) { |
1da177e4 LT |
804 | ret = -EINVAL; |
805 | goto out; | |
806 | } | |
807 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) { | |
808 | ret = -ENOMEM; | |
809 | goto out; | |
810 | } | |
811 | ||
3d5ff529 | 812 | inode = filep->f_path.dentry->d_inode; |
bce34bc0 | 813 | cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK); |
1da177e4 LT |
814 | if (cur_enforcing < 0) { |
815 | ret = cur_enforcing; | |
816 | goto out; | |
817 | } | |
818 | ||
819 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, | |
bce34bc0 | 820 | bool_pending_values[inode->i_ino&SEL_INO_MASK]); |
68bdcf28 | 821 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 822 | out: |
bb003079 | 823 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
824 | if (page) |
825 | free_page((unsigned long)page); | |
826 | return ret; | |
827 | } | |
828 | ||
829 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
830 | size_t count, loff_t *ppos) | |
831 | { | |
832 | char *page = NULL; | |
833 | ssize_t length = -EFAULT; | |
834 | int new_value; | |
835 | struct inode *inode; | |
836 | ||
bb003079 | 837 | mutex_lock(&sel_mutex); |
1da177e4 LT |
838 | |
839 | length = task_has_security(current, SECURITY__SETBOOL); | |
840 | if (length) | |
841 | goto out; | |
842 | ||
843 | /* check to see if this file has been deleted */ | |
844 | if (!filep->f_op) | |
845 | goto out; | |
846 | ||
bfd51626 | 847 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
848 | length = -ENOMEM; |
849 | goto out; | |
850 | } | |
851 | if (*ppos != 0) { | |
852 | /* No partial writes. */ | |
853 | goto out; | |
854 | } | |
855 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
856 | if (!page) { | |
857 | length = -ENOMEM; | |
858 | goto out; | |
859 | } | |
860 | ||
861 | if (copy_from_user(page, buf, count)) | |
862 | goto out; | |
863 | ||
864 | length = -EINVAL; | |
865 | if (sscanf(page, "%d", &new_value) != 1) | |
866 | goto out; | |
867 | ||
868 | if (new_value) | |
869 | new_value = 1; | |
870 | ||
3d5ff529 | 871 | inode = filep->f_path.dentry->d_inode; |
bce34bc0 | 872 | bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value; |
1da177e4 LT |
873 | length = count; |
874 | ||
875 | out: | |
bb003079 | 876 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
877 | if (page) |
878 | free_page((unsigned long) page); | |
879 | return length; | |
880 | } | |
881 | ||
9c2e08c5 | 882 | static const struct file_operations sel_bool_ops = { |
1da177e4 LT |
883 | .read = sel_read_bool, |
884 | .write = sel_write_bool, | |
885 | }; | |
886 | ||
887 | static ssize_t sel_commit_bools_write(struct file *filep, | |
888 | const char __user *buf, | |
889 | size_t count, loff_t *ppos) | |
890 | { | |
891 | char *page = NULL; | |
892 | ssize_t length = -EFAULT; | |
893 | int new_value; | |
894 | ||
bb003079 | 895 | mutex_lock(&sel_mutex); |
1da177e4 LT |
896 | |
897 | length = task_has_security(current, SECURITY__SETBOOL); | |
898 | if (length) | |
899 | goto out; | |
900 | ||
901 | /* check to see if this file has been deleted */ | |
902 | if (!filep->f_op) | |
903 | goto out; | |
904 | ||
bfd51626 | 905 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
906 | length = -ENOMEM; |
907 | goto out; | |
908 | } | |
909 | if (*ppos != 0) { | |
910 | /* No partial writes. */ | |
911 | goto out; | |
912 | } | |
913 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
914 | if (!page) { | |
915 | length = -ENOMEM; | |
916 | goto out; | |
917 | } | |
918 | ||
919 | if (copy_from_user(page, buf, count)) | |
920 | goto out; | |
921 | ||
922 | length = -EINVAL; | |
923 | if (sscanf(page, "%d", &new_value) != 1) | |
924 | goto out; | |
925 | ||
20c19e41 | 926 | if (new_value && bool_pending_values) { |
1da177e4 LT |
927 | security_set_bools(bool_num, bool_pending_values); |
928 | } | |
929 | ||
930 | length = count; | |
931 | ||
932 | out: | |
bb003079 | 933 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
934 | if (page) |
935 | free_page((unsigned long) page); | |
936 | return length; | |
937 | } | |
938 | ||
9c2e08c5 | 939 | static const struct file_operations sel_commit_bools_ops = { |
1da177e4 LT |
940 | .write = sel_commit_bools_write, |
941 | }; | |
942 | ||
943 | /* delete booleans - partial revoke() from | |
944 | * fs/proc/generic.c proc_kill_inodes */ | |
945 | static void sel_remove_bools(struct dentry *de) | |
946 | { | |
947 | struct list_head *p, *node; | |
948 | struct super_block *sb = de->d_sb; | |
949 | ||
950 | spin_lock(&dcache_lock); | |
951 | node = de->d_subdirs.next; | |
952 | while (node != &de->d_subdirs) { | |
5160ee6f | 953 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
1da177e4 LT |
954 | list_del_init(node); |
955 | ||
956 | if (d->d_inode) { | |
957 | d = dget_locked(d); | |
958 | spin_unlock(&dcache_lock); | |
959 | d_delete(d); | |
960 | simple_unlink(de->d_inode, d); | |
961 | dput(d); | |
962 | spin_lock(&dcache_lock); | |
963 | } | |
964 | node = de->d_subdirs.next; | |
965 | } | |
966 | ||
967 | spin_unlock(&dcache_lock); | |
968 | ||
969 | file_list_lock(); | |
970 | list_for_each(p, &sb->s_files) { | |
2f512016 | 971 | struct file * filp = list_entry(p, struct file, f_u.fu_list); |
3d5ff529 | 972 | struct dentry * dentry = filp->f_path.dentry; |
1da177e4 LT |
973 | |
974 | if (dentry->d_parent != de) { | |
975 | continue; | |
976 | } | |
977 | filp->f_op = NULL; | |
978 | } | |
979 | file_list_unlock(); | |
980 | } | |
981 | ||
982 | #define BOOL_DIR_NAME "booleans" | |
983 | ||
984 | static int sel_make_bools(void) | |
985 | { | |
986 | int i, ret = 0; | |
987 | ssize_t len; | |
988 | struct dentry *dentry = NULL; | |
989 | struct dentry *dir = bool_dir; | |
990 | struct inode *inode = NULL; | |
991 | struct inode_security_struct *isec; | |
992 | char **names = NULL, *page; | |
993 | int num; | |
994 | int *values = NULL; | |
995 | u32 sid; | |
996 | ||
997 | /* remove any existing files */ | |
9a5f04bf | 998 | kfree(bool_pending_values); |
20c19e41 | 999 | bool_pending_values = NULL; |
1da177e4 LT |
1000 | |
1001 | sel_remove_bools(dir); | |
1002 | ||
1003 | if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) | |
1004 | return -ENOMEM; | |
1005 | ||
1006 | ret = security_get_bools(&num, &names, &values); | |
1007 | if (ret != 0) | |
1008 | goto out; | |
1009 | ||
1010 | for (i = 0; i < num; i++) { | |
1011 | dentry = d_alloc_name(dir, names[i]); | |
1012 | if (!dentry) { | |
1013 | ret = -ENOMEM; | |
1014 | goto err; | |
1015 | } | |
1016 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); | |
1017 | if (!inode) { | |
1018 | ret = -ENOMEM; | |
1019 | goto err; | |
1020 | } | |
1021 | ||
1022 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1023 | if (len < 0) { | |
1024 | ret = -EINVAL; | |
1025 | goto err; | |
1026 | } else if (len >= PAGE_SIZE) { | |
1027 | ret = -ENAMETOOLONG; | |
1028 | goto err; | |
1029 | } | |
1030 | isec = (struct inode_security_struct*)inode->i_security; | |
1031 | if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid))) | |
1032 | goto err; | |
1033 | isec->sid = sid; | |
1034 | isec->initialized = 1; | |
1035 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1036 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1037 | d_add(dentry, inode); |
1038 | } | |
1039 | bool_num = num; | |
1040 | bool_pending_values = values; | |
1041 | out: | |
1042 | free_page((unsigned long)page); | |
1043 | if (names) { | |
9a5f04bf JJ |
1044 | for (i = 0; i < num; i++) |
1045 | kfree(names[i]); | |
1da177e4 LT |
1046 | kfree(names); |
1047 | } | |
1048 | return ret; | |
1049 | err: | |
20c19e41 | 1050 | kfree(values); |
253a8b1d | 1051 | sel_remove_bools(dir); |
1da177e4 LT |
1052 | ret = -ENOMEM; |
1053 | goto out; | |
1054 | } | |
1055 | ||
1056 | #define NULL_FILE_NAME "null" | |
1057 | ||
1058 | struct dentry *selinux_null = NULL; | |
1059 | ||
1060 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1061 | size_t count, loff_t *ppos) | |
1062 | { | |
1063 | char tmpbuf[TMPBUFLEN]; | |
1064 | ssize_t length; | |
1065 | ||
1066 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1067 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1068 | } | |
1069 | ||
1070 | static ssize_t sel_write_avc_cache_threshold(struct file * file, | |
1071 | const char __user * buf, | |
1072 | size_t count, loff_t *ppos) | |
1073 | ||
1074 | { | |
1075 | char *page; | |
1076 | ssize_t ret; | |
1077 | int new_value; | |
1078 | ||
bfd51626 | 1079 | if (count >= PAGE_SIZE) { |
1da177e4 LT |
1080 | ret = -ENOMEM; |
1081 | goto out; | |
1082 | } | |
1083 | ||
1084 | if (*ppos != 0) { | |
1085 | /* No partial writes. */ | |
1086 | ret = -EINVAL; | |
1087 | goto out; | |
1088 | } | |
1089 | ||
1090 | page = (char*)get_zeroed_page(GFP_KERNEL); | |
1091 | if (!page) { | |
1092 | ret = -ENOMEM; | |
1093 | goto out; | |
1094 | } | |
1095 | ||
1096 | if (copy_from_user(page, buf, count)) { | |
1097 | ret = -EFAULT; | |
1098 | goto out_free; | |
1099 | } | |
1100 | ||
1101 | if (sscanf(page, "%u", &new_value) != 1) { | |
1102 | ret = -EINVAL; | |
1103 | goto out; | |
1104 | } | |
1105 | ||
1106 | if (new_value != avc_cache_threshold) { | |
1107 | ret = task_has_security(current, SECURITY__SETSECPARAM); | |
1108 | if (ret) | |
1109 | goto out_free; | |
1110 | avc_cache_threshold = new_value; | |
1111 | } | |
1112 | ret = count; | |
1113 | out_free: | |
1114 | free_page((unsigned long)page); | |
1115 | out: | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1120 | size_t count, loff_t *ppos) | |
1121 | { | |
1122 | char *page; | |
1123 | ssize_t ret = 0; | |
1124 | ||
1125 | page = (char *)__get_free_page(GFP_KERNEL); | |
1126 | if (!page) { | |
1127 | ret = -ENOMEM; | |
1128 | goto out; | |
1129 | } | |
1130 | ret = avc_get_hash_stats(page); | |
1131 | if (ret >= 0) | |
1132 | ret = simple_read_from_buffer(buf, count, ppos, page, ret); | |
1133 | free_page((unsigned long)page); | |
1134 | out: | |
1135 | return ret; | |
1136 | } | |
1137 | ||
9c2e08c5 | 1138 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1139 | .read = sel_read_avc_cache_threshold, |
1140 | .write = sel_write_avc_cache_threshold, | |
1141 | }; | |
1142 | ||
9c2e08c5 | 1143 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 LT |
1144 | .read = sel_read_avc_hash_stats, |
1145 | }; | |
1146 | ||
1147 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1148 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1149 | { | |
1150 | int cpu; | |
1151 | ||
1152 | for (cpu = *idx; cpu < NR_CPUS; ++cpu) { | |
1153 | if (!cpu_possible(cpu)) | |
1154 | continue; | |
1155 | *idx = cpu + 1; | |
1156 | return &per_cpu(avc_cache_stats, cpu); | |
1157 | } | |
1158 | return NULL; | |
1159 | } | |
1160 | ||
1161 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1162 | { | |
1163 | loff_t n = *pos - 1; | |
1164 | ||
1165 | if (*pos == 0) | |
1166 | return SEQ_START_TOKEN; | |
1167 | ||
1168 | return sel_avc_get_stat_idx(&n); | |
1169 | } | |
1170 | ||
1171 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1172 | { | |
1173 | return sel_avc_get_stat_idx(pos); | |
1174 | } | |
1175 | ||
1176 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1177 | { | |
1178 | struct avc_cache_stats *st = v; | |
1179 | ||
1180 | if (v == SEQ_START_TOKEN) | |
1181 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1182 | "frees\n"); | |
1183 | else | |
1184 | seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups, | |
1185 | st->hits, st->misses, st->allocations, | |
1186 | st->reclaims, st->frees); | |
1187 | return 0; | |
1188 | } | |
1189 | ||
1190 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1191 | { } | |
1192 | ||
1193 | static struct seq_operations sel_avc_cache_stats_seq_ops = { | |
1194 | .start = sel_avc_stats_seq_start, | |
1195 | .next = sel_avc_stats_seq_next, | |
1196 | .show = sel_avc_stats_seq_show, | |
1197 | .stop = sel_avc_stats_seq_stop, | |
1198 | }; | |
1199 | ||
1200 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1201 | { | |
1202 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1203 | } | |
1204 | ||
9c2e08c5 | 1205 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1206 | .open = sel_open_avc_cache_stats, |
1207 | .read = seq_read, | |
1208 | .llseek = seq_lseek, | |
1209 | .release = seq_release, | |
1210 | }; | |
1211 | #endif | |
1212 | ||
1213 | static int sel_make_avc_files(struct dentry *dir) | |
1214 | { | |
1215 | int i, ret = 0; | |
1216 | static struct tree_descr files[] = { | |
1217 | { "cache_threshold", | |
1218 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1219 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1220 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1221 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1222 | #endif | |
1223 | }; | |
1224 | ||
6e20a64a | 1225 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1226 | struct inode *inode; |
1227 | struct dentry *dentry; | |
1228 | ||
1229 | dentry = d_alloc_name(dir, files[i].name); | |
1230 | if (!dentry) { | |
1231 | ret = -ENOMEM; | |
d6aafa65 | 1232 | goto out; |
1da177e4 LT |
1233 | } |
1234 | ||
1235 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1236 | if (!inode) { | |
1237 | ret = -ENOMEM; | |
d6aafa65 | 1238 | goto out; |
1da177e4 LT |
1239 | } |
1240 | inode->i_fop = files[i].ops; | |
6174eafc | 1241 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1242 | d_add(dentry, inode); |
1243 | } | |
1244 | out: | |
1245 | return ret; | |
1da177e4 LT |
1246 | } |
1247 | ||
f0ee2e46 JC |
1248 | static ssize_t sel_read_initcon(struct file * file, char __user *buf, |
1249 | size_t count, loff_t *ppos) | |
1250 | { | |
1251 | struct inode *inode; | |
1252 | char *con; | |
1253 | u32 sid, len; | |
1254 | ssize_t ret; | |
1255 | ||
1256 | inode = file->f_path.dentry->d_inode; | |
1257 | sid = inode->i_ino&SEL_INO_MASK; | |
1258 | ret = security_sid_to_context(sid, &con, &len); | |
1259 | if (ret < 0) | |
1260 | return ret; | |
1261 | ||
1262 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1263 | kfree(con); | |
1264 | return ret; | |
1265 | } | |
1266 | ||
1267 | static const struct file_operations sel_initcon_ops = { | |
1268 | .read = sel_read_initcon, | |
1269 | }; | |
1270 | ||
1271 | static int sel_make_initcon_files(struct dentry *dir) | |
1272 | { | |
1273 | int i, ret = 0; | |
1274 | ||
1275 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1276 | struct inode *inode; | |
1277 | struct dentry *dentry; | |
1278 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
1279 | if (!dentry) { | |
1280 | ret = -ENOMEM; | |
1281 | goto out; | |
1282 | } | |
1283 | ||
1284 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
1285 | if (!inode) { | |
1286 | ret = -ENOMEM; | |
1287 | goto out; | |
1288 | } | |
1289 | inode->i_fop = &sel_initcon_ops; | |
1290 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1291 | d_add(dentry, inode); | |
1292 | } | |
1293 | out: | |
1294 | return ret; | |
1295 | } | |
1296 | ||
edb20fb5 | 1297 | static int sel_make_dir(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
1298 | { |
1299 | int ret = 0; | |
1300 | struct inode *inode; | |
1301 | ||
edb20fb5 | 1302 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
1da177e4 LT |
1303 | if (!inode) { |
1304 | ret = -ENOMEM; | |
1305 | goto out; | |
1306 | } | |
1307 | inode->i_op = &simple_dir_inode_operations; | |
1308 | inode->i_fop = &simple_dir_operations; | |
6174eafc | 1309 | inode->i_ino = ++sel_last_ino; |
40e906f8 | 1310 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1311 | inc_nlink(inode); |
1da177e4 | 1312 | d_add(dentry, inode); |
edb20fb5 | 1313 | /* bump link count on parent directory, too */ |
d8c76e6f | 1314 | inc_nlink(dir); |
1da177e4 LT |
1315 | out: |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | static int sel_fill_super(struct super_block * sb, void * data, int silent) | |
1320 | { | |
1321 | int ret; | |
1322 | struct dentry *dentry; | |
edb20fb5 | 1323 | struct inode *inode, *root_inode; |
1da177e4 LT |
1324 | struct inode_security_struct *isec; |
1325 | ||
1326 | static struct tree_descr selinux_files[] = { | |
1327 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1328 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1329 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1330 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1331 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1332 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1333 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1334 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1335 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1336 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1337 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1338 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1339 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
4e5ab4cb | 1340 | [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR}, |
1da177e4 LT |
1341 | /* last one */ {""} |
1342 | }; | |
1343 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1344 | if (ret) | |
161ce45a | 1345 | goto err; |
1da177e4 | 1346 | |
edb20fb5 JM |
1347 | root_inode = sb->s_root->d_inode; |
1348 | ||
1da177e4 | 1349 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
161ce45a JM |
1350 | if (!dentry) { |
1351 | ret = -ENOMEM; | |
1352 | goto err; | |
1353 | } | |
1da177e4 | 1354 | |
edb20fb5 | 1355 | ret = sel_make_dir(root_inode, dentry); |
cde174a8 | 1356 | if (ret) |
161ce45a | 1357 | goto err; |
cde174a8 | 1358 | |
1da177e4 | 1359 | bool_dir = dentry; |
1da177e4 LT |
1360 | |
1361 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); | |
161ce45a JM |
1362 | if (!dentry) { |
1363 | ret = -ENOMEM; | |
1364 | goto err; | |
1365 | } | |
1da177e4 LT |
1366 | |
1367 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); | |
161ce45a JM |
1368 | if (!inode) { |
1369 | ret = -ENOMEM; | |
1370 | goto err; | |
1371 | } | |
6174eafc | 1372 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1373 | isec = (struct inode_security_struct*)inode->i_security; |
1374 | isec->sid = SECINITSID_DEVNULL; | |
1375 | isec->sclass = SECCLASS_CHR_FILE; | |
1376 | isec->initialized = 1; | |
1377 | ||
1378 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1379 | d_add(dentry, inode); | |
1380 | selinux_null = dentry; | |
1381 | ||
1382 | dentry = d_alloc_name(sb->s_root, "avc"); | |
161ce45a JM |
1383 | if (!dentry) { |
1384 | ret = -ENOMEM; | |
1385 | goto err; | |
1386 | } | |
1da177e4 | 1387 | |
edb20fb5 | 1388 | ret = sel_make_dir(root_inode, dentry); |
1da177e4 | 1389 | if (ret) |
161ce45a | 1390 | goto err; |
1da177e4 LT |
1391 | |
1392 | ret = sel_make_avc_files(dentry); | |
1393 | if (ret) | |
161ce45a | 1394 | goto err; |
f0ee2e46 JC |
1395 | |
1396 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); | |
1397 | if (!dentry) { | |
1398 | ret = -ENOMEM; | |
1399 | goto err; | |
1400 | } | |
1401 | ||
1402 | ret = sel_make_dir(root_inode, dentry); | |
1403 | if (ret) | |
1404 | goto err; | |
1405 | ||
1406 | ret = sel_make_initcon_files(dentry); | |
1407 | if (ret) | |
1408 | goto err; | |
1409 | ||
1da177e4 | 1410 | out: |
161ce45a JM |
1411 | return ret; |
1412 | err: | |
1da177e4 | 1413 | printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__); |
161ce45a | 1414 | goto out; |
1da177e4 LT |
1415 | } |
1416 | ||
454e2398 DH |
1417 | static int sel_get_sb(struct file_system_type *fs_type, |
1418 | int flags, const char *dev_name, void *data, | |
1419 | struct vfsmount *mnt) | |
1da177e4 | 1420 | { |
454e2398 | 1421 | return get_sb_single(fs_type, flags, data, sel_fill_super, mnt); |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | static struct file_system_type sel_fs_type = { | |
1425 | .name = "selinuxfs", | |
1426 | .get_sb = sel_get_sb, | |
1427 | .kill_sb = kill_litter_super, | |
1428 | }; | |
1429 | ||
1430 | struct vfsmount *selinuxfs_mount; | |
1431 | ||
1432 | static int __init init_sel_fs(void) | |
1433 | { | |
1434 | int err; | |
1435 | ||
1436 | if (!selinux_enabled) | |
1437 | return 0; | |
1438 | err = register_filesystem(&sel_fs_type); | |
1439 | if (!err) { | |
1440 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1441 | if (IS_ERR(selinuxfs_mount)) { | |
1442 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1443 | err = PTR_ERR(selinuxfs_mount); | |
1444 | selinuxfs_mount = NULL; | |
1445 | } | |
1446 | } | |
1447 | return err; | |
1448 | } | |
1449 | ||
1450 | __initcall(init_sel_fs); | |
1451 | ||
1452 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1453 | void exit_sel_fs(void) | |
1454 | { | |
1455 | unregister_filesystem(&sel_fs_type); | |
1456 | } | |
1457 | #endif |