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Commit | Line | Data |
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1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
1872981b | 3 | * Added conditional policy language extensions |
1da177e4 | 4 | * |
82c21bfa | 5 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
3bb56b25 | 6 | * |
1872981b | 7 | * Added support for the policy capability bitmap |
3bb56b25 PM |
8 | * |
9 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
10 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
11 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
12 | * This program is free software; you can redistribute it and/or modify | |
1872981b | 13 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
14 | * the Free Software Foundation, version 2. |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
bb003079 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/percpu.h> | |
af601e46 | 29 | #include <linux/audit.h> |
f5269710 | 30 | #include <linux/uaccess.h> |
7a627e3b | 31 | #include <linux/kobject.h> |
0f7e4c33 | 32 | #include <linux/ctype.h> |
1da177e4 LT |
33 | |
34 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
35 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
36 | ||
37 | #include "flask.h" | |
38 | #include "avc.h" | |
39 | #include "avc_ss.h" | |
40 | #include "security.h" | |
41 | #include "objsec.h" | |
42 | #include "conditional.h" | |
43 | ||
3bb56b25 PM |
44 | /* Policy capability filenames */ |
45 | static char *policycap_names[] = { | |
b0c636b9 EP |
46 | "network_peer_controls", |
47 | "open_perms" | |
3bb56b25 PM |
48 | }; |
49 | ||
1da177e4 LT |
50 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
51 | ||
52 | static int __init checkreqprot_setup(char *str) | |
53 | { | |
f5269710 EP |
54 | unsigned long checkreqprot; |
55 | if (!strict_strtoul(str, 0, &checkreqprot)) | |
56 | selinux_checkreqprot = checkreqprot ? 1 : 0; | |
1da177e4 LT |
57 | return 1; |
58 | } | |
59 | __setup("checkreqprot=", checkreqprot_setup); | |
60 | ||
bb003079 | 61 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
62 | |
63 | /* global data for booleans */ | |
1872981b EP |
64 | static struct dentry *bool_dir; |
65 | static int bool_num; | |
d313f948 | 66 | static char **bool_pending_names; |
1872981b | 67 | static int *bool_pending_values; |
1da177e4 | 68 | |
e47c8fc5 | 69 | /* global data for classes */ |
1872981b | 70 | static struct dentry *class_dir; |
e47c8fc5 CP |
71 | static unsigned long last_class_ino; |
72 | ||
cee74f47 EP |
73 | static char policy_opened; |
74 | ||
3bb56b25 | 75 | /* global data for policy capabilities */ |
1872981b | 76 | static struct dentry *policycap_dir; |
3bb56b25 | 77 | |
1da177e4 LT |
78 | /* Check whether a task is allowed to use a security operation. */ |
79 | static int task_has_security(struct task_struct *tsk, | |
80 | u32 perms) | |
81 | { | |
c69e8d9c DH |
82 | const struct task_security_struct *tsec; |
83 | u32 sid = 0; | |
84 | ||
85 | rcu_read_lock(); | |
86 | tsec = __task_cred(tsk)->security; | |
87 | if (tsec) | |
88 | sid = tsec->sid; | |
89 | rcu_read_unlock(); | |
1da177e4 LT |
90 | if (!tsec) |
91 | return -EACCES; | |
92 | ||
c69e8d9c | 93 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
94 | SECCLASS_SECURITY, perms, NULL); |
95 | } | |
96 | ||
97 | enum sel_inos { | |
98 | SEL_ROOT_INO = 2, | |
99 | SEL_LOAD, /* load policy */ | |
100 | SEL_ENFORCE, /* get or set enforcing status */ | |
101 | SEL_CONTEXT, /* validate context */ | |
102 | SEL_ACCESS, /* compute access decision */ | |
103 | SEL_CREATE, /* compute create labeling decision */ | |
104 | SEL_RELABEL, /* compute relabeling decision */ | |
105 | SEL_USER, /* compute reachable user contexts */ | |
106 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
107 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
108 | SEL_MLS, /* return if MLS policy is enabled */ | |
109 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
110 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
111 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 112 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
113 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
114 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 115 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 116 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
6174eafc | 117 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
118 | }; |
119 | ||
6174eafc JC |
120 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
121 | ||
3bb56b25 PM |
122 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
123 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
124 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
125 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
126 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 127 | |
1da177e4 LT |
128 | #define TMPBUFLEN 12 |
129 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
130 | size_t count, loff_t *ppos) | |
131 | { | |
132 | char tmpbuf[TMPBUFLEN]; | |
133 | ssize_t length; | |
134 | ||
135 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
136 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
137 | } | |
138 | ||
139 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 140 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
141 | size_t count, loff_t *ppos) |
142 | ||
143 | { | |
b77a493b | 144 | char *page = NULL; |
1da177e4 LT |
145 | ssize_t length; |
146 | int new_value; | |
147 | ||
b77a493b | 148 | length = -ENOMEM; |
bfd51626 | 149 | if (count >= PAGE_SIZE) |
b77a493b EP |
150 | goto out; |
151 | ||
152 | /* No partial writes. */ | |
153 | length = EINVAL; | |
154 | if (*ppos != 0) | |
155 | goto out; | |
156 | ||
157 | length = -ENOMEM; | |
1872981b | 158 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 159 | if (!page) |
b77a493b EP |
160 | goto out; |
161 | ||
1da177e4 LT |
162 | length = -EFAULT; |
163 | if (copy_from_user(page, buf, count)) | |
164 | goto out; | |
165 | ||
166 | length = -EINVAL; | |
167 | if (sscanf(page, "%d", &new_value) != 1) | |
168 | goto out; | |
169 | ||
170 | if (new_value != selinux_enforcing) { | |
171 | length = task_has_security(current, SECURITY__SETENFORCE); | |
172 | if (length) | |
173 | goto out; | |
af601e46 | 174 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
175 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
176 | new_value, selinux_enforcing, | |
177 | audit_get_loginuid(current), | |
178 | audit_get_sessionid(current)); | |
1da177e4 LT |
179 | selinux_enforcing = new_value; |
180 | if (selinux_enforcing) | |
181 | avc_ss_reset(0); | |
182 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 183 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
184 | } |
185 | length = count; | |
186 | out: | |
187 | free_page((unsigned long) page); | |
188 | return length; | |
189 | } | |
190 | #else | |
191 | #define sel_write_enforce NULL | |
192 | #endif | |
193 | ||
9c2e08c5 | 194 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
195 | .read = sel_read_enforce, |
196 | .write = sel_write_enforce, | |
57a62c23 | 197 | .llseek = generic_file_llseek, |
1da177e4 LT |
198 | }; |
199 | ||
3f12070e EP |
200 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
201 | size_t count, loff_t *ppos) | |
202 | { | |
203 | char tmpbuf[TMPBUFLEN]; | |
204 | ssize_t length; | |
205 | ino_t ino = filp->f_path.dentry->d_inode->i_ino; | |
206 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? | |
207 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
208 | ||
209 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
210 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
211 | } | |
212 | ||
213 | static const struct file_operations sel_handle_unknown_ops = { | |
214 | .read = sel_read_handle_unknown, | |
57a62c23 | 215 | .llseek = generic_file_llseek, |
3f12070e EP |
216 | }; |
217 | ||
11904167 KK |
218 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
219 | { | |
220 | struct page *status = selinux_kernel_status_page(); | |
221 | ||
222 | if (!status) | |
223 | return -ENOMEM; | |
224 | ||
225 | filp->private_data = status; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
231 | size_t count, loff_t *ppos) | |
232 | { | |
233 | struct page *status = filp->private_data; | |
234 | ||
235 | BUG_ON(!status); | |
236 | ||
237 | return simple_read_from_buffer(buf, count, ppos, | |
238 | page_address(status), | |
239 | sizeof(struct selinux_kernel_status)); | |
240 | } | |
241 | ||
242 | static int sel_mmap_handle_status(struct file *filp, | |
243 | struct vm_area_struct *vma) | |
244 | { | |
245 | struct page *status = filp->private_data; | |
246 | unsigned long size = vma->vm_end - vma->vm_start; | |
247 | ||
248 | BUG_ON(!status); | |
249 | ||
250 | /* only allows one page from the head */ | |
251 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
252 | return -EIO; | |
253 | /* disallow writable mapping */ | |
254 | if (vma->vm_flags & VM_WRITE) | |
255 | return -EPERM; | |
256 | /* disallow mprotect() turns it into writable */ | |
257 | vma->vm_flags &= ~VM_MAYWRITE; | |
258 | ||
259 | return remap_pfn_range(vma, vma->vm_start, | |
260 | page_to_pfn(status), | |
261 | size, vma->vm_page_prot); | |
262 | } | |
263 | ||
264 | static const struct file_operations sel_handle_status_ops = { | |
265 | .open = sel_open_handle_status, | |
266 | .read = sel_read_handle_status, | |
267 | .mmap = sel_mmap_handle_status, | |
268 | .llseek = generic_file_llseek, | |
269 | }; | |
270 | ||
1da177e4 | 271 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 272 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
273 | size_t count, loff_t *ppos) |
274 | ||
275 | { | |
b77a493b | 276 | char *page = NULL; |
1da177e4 LT |
277 | ssize_t length; |
278 | int new_value; | |
1da177e4 | 279 | |
b77a493b | 280 | length = -ENOMEM; |
bfd51626 | 281 | if (count >= PAGE_SIZE) |
6eab04a8 | 282 | goto out; |
b77a493b EP |
283 | |
284 | /* No partial writes. */ | |
285 | length = -EINVAL; | |
286 | if (*ppos != 0) | |
287 | goto out; | |
288 | ||
289 | length = -ENOMEM; | |
1872981b | 290 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 291 | if (!page) |
b77a493b EP |
292 | goto out; |
293 | ||
1da177e4 LT |
294 | length = -EFAULT; |
295 | if (copy_from_user(page, buf, count)) | |
296 | goto out; | |
297 | ||
298 | length = -EINVAL; | |
299 | if (sscanf(page, "%d", &new_value) != 1) | |
300 | goto out; | |
301 | ||
302 | if (new_value) { | |
303 | length = selinux_disable(); | |
b77a493b | 304 | if (length) |
1da177e4 | 305 | goto out; |
af601e46 | 306 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
307 | "selinux=0 auid=%u ses=%u", |
308 | audit_get_loginuid(current), | |
309 | audit_get_sessionid(current)); | |
1da177e4 LT |
310 | } |
311 | ||
312 | length = count; | |
313 | out: | |
314 | free_page((unsigned long) page); | |
315 | return length; | |
316 | } | |
317 | #else | |
318 | #define sel_write_disable NULL | |
319 | #endif | |
320 | ||
9c2e08c5 | 321 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 322 | .write = sel_write_disable, |
57a62c23 | 323 | .llseek = generic_file_llseek, |
1da177e4 LT |
324 | }; |
325 | ||
326 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 327 | size_t count, loff_t *ppos) |
1da177e4 LT |
328 | { |
329 | char tmpbuf[TMPBUFLEN]; | |
330 | ssize_t length; | |
331 | ||
332 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
333 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
334 | } | |
335 | ||
9c2e08c5 | 336 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 337 | .read = sel_read_policyvers, |
57a62c23 | 338 | .llseek = generic_file_llseek, |
1da177e4 LT |
339 | }; |
340 | ||
341 | /* declaration for sel_write_load */ | |
342 | static int sel_make_bools(void); | |
e47c8fc5 | 343 | static int sel_make_classes(void); |
3bb56b25 | 344 | static int sel_make_policycap(void); |
e47c8fc5 CP |
345 | |
346 | /* declaration for sel_make_class_dirs */ | |
347 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, | |
348 | unsigned long *ino); | |
1da177e4 LT |
349 | |
350 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
351 | size_t count, loff_t *ppos) | |
352 | { | |
353 | char tmpbuf[TMPBUFLEN]; | |
354 | ssize_t length; | |
355 | ||
0719aaf5 GT |
356 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
357 | security_mls_enabled()); | |
1da177e4 LT |
358 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
359 | } | |
360 | ||
9c2e08c5 | 361 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 362 | .read = sel_read_mls, |
57a62c23 | 363 | .llseek = generic_file_llseek, |
1da177e4 LT |
364 | }; |
365 | ||
cee74f47 EP |
366 | struct policy_load_memory { |
367 | size_t len; | |
368 | void *data; | |
369 | }; | |
370 | ||
371 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
372 | { | |
373 | struct policy_load_memory *plm = NULL; | |
374 | int rc; | |
375 | ||
376 | BUG_ON(filp->private_data); | |
377 | ||
378 | mutex_lock(&sel_mutex); | |
379 | ||
380 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
381 | if (rc) | |
382 | goto err; | |
383 | ||
384 | rc = -EBUSY; | |
385 | if (policy_opened) | |
386 | goto err; | |
387 | ||
388 | rc = -ENOMEM; | |
389 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
390 | if (!plm) | |
391 | goto err; | |
392 | ||
393 | if (i_size_read(inode) != security_policydb_len()) { | |
394 | mutex_lock(&inode->i_mutex); | |
395 | i_size_write(inode, security_policydb_len()); | |
396 | mutex_unlock(&inode->i_mutex); | |
397 | } | |
398 | ||
399 | rc = security_read_policy(&plm->data, &plm->len); | |
400 | if (rc) | |
401 | goto err; | |
402 | ||
403 | policy_opened = 1; | |
404 | ||
405 | filp->private_data = plm; | |
406 | ||
407 | mutex_unlock(&sel_mutex); | |
408 | ||
409 | return 0; | |
410 | err: | |
411 | mutex_unlock(&sel_mutex); | |
412 | ||
413 | if (plm) | |
414 | vfree(plm->data); | |
415 | kfree(plm); | |
416 | return rc; | |
417 | } | |
418 | ||
419 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
420 | { | |
421 | struct policy_load_memory *plm = filp->private_data; | |
422 | ||
423 | BUG_ON(!plm); | |
424 | ||
425 | policy_opened = 0; | |
426 | ||
427 | vfree(plm->data); | |
428 | kfree(plm); | |
429 | ||
430 | return 0; | |
431 | } | |
432 | ||
433 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
434 | size_t count, loff_t *ppos) | |
435 | { | |
436 | struct policy_load_memory *plm = filp->private_data; | |
437 | int ret; | |
438 | ||
439 | mutex_lock(&sel_mutex); | |
440 | ||
441 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
442 | if (ret) | |
443 | goto out; | |
444 | ||
445 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
446 | out: | |
447 | mutex_unlock(&sel_mutex); | |
448 | return ret; | |
449 | } | |
450 | ||
845ca30f EP |
451 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
452 | struct vm_fault *vmf) | |
453 | { | |
454 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
455 | unsigned long offset; | |
456 | struct page *page; | |
457 | ||
458 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
459 | return VM_FAULT_SIGBUS; | |
460 | ||
461 | offset = vmf->pgoff << PAGE_SHIFT; | |
462 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
463 | return VM_FAULT_SIGBUS; | |
464 | ||
465 | page = vmalloc_to_page(plm->data + offset); | |
466 | get_page(page); | |
467 | ||
468 | vmf->page = page; | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static struct vm_operations_struct sel_mmap_policy_ops = { | |
474 | .fault = sel_mmap_policy_fault, | |
475 | .page_mkwrite = sel_mmap_policy_fault, | |
476 | }; | |
477 | ||
ad3fa08c | 478 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
479 | { |
480 | if (vma->vm_flags & VM_SHARED) { | |
481 | /* do not allow mprotect to make mapping writable */ | |
482 | vma->vm_flags &= ~VM_MAYWRITE; | |
483 | ||
484 | if (vma->vm_flags & VM_WRITE) | |
485 | return -EACCES; | |
486 | } | |
487 | ||
488 | vma->vm_flags |= VM_RESERVED; | |
489 | vma->vm_ops = &sel_mmap_policy_ops; | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
cee74f47 EP |
494 | static const struct file_operations sel_policy_ops = { |
495 | .open = sel_open_policy, | |
496 | .read = sel_read_policy, | |
845ca30f | 497 | .mmap = sel_mmap_policy, |
cee74f47 EP |
498 | .release = sel_release_policy, |
499 | }; | |
500 | ||
1872981b | 501 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
502 | size_t count, loff_t *ppos) |
503 | ||
504 | { | |
1da177e4 LT |
505 | ssize_t length; |
506 | void *data = NULL; | |
507 | ||
bb003079 | 508 | mutex_lock(&sel_mutex); |
1da177e4 LT |
509 | |
510 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
511 | if (length) | |
512 | goto out; | |
513 | ||
b77a493b EP |
514 | /* No partial writes. */ |
515 | length = -EINVAL; | |
516 | if (*ppos != 0) | |
1da177e4 | 517 | goto out; |
1da177e4 | 518 | |
b77a493b EP |
519 | length = -EFBIG; |
520 | if (count > 64 * 1024 * 1024) | |
521 | goto out; | |
522 | ||
523 | length = -ENOMEM; | |
524 | data = vmalloc(count); | |
525 | if (!data) | |
1da177e4 | 526 | goto out; |
1da177e4 LT |
527 | |
528 | length = -EFAULT; | |
529 | if (copy_from_user(data, buf, count) != 0) | |
530 | goto out; | |
531 | ||
532 | length = security_load_policy(data, count); | |
533 | if (length) | |
534 | goto out; | |
535 | ||
b77a493b EP |
536 | length = sel_make_bools(); |
537 | if (length) | |
e47c8fc5 | 538 | goto out1; |
e47c8fc5 | 539 | |
b77a493b EP |
540 | length = sel_make_classes(); |
541 | if (length) | |
3bb56b25 | 542 | goto out1; |
3bb56b25 | 543 | |
b77a493b EP |
544 | length = sel_make_policycap(); |
545 | if (length) | |
546 | goto out1; | |
547 | ||
548 | length = count; | |
e47c8fc5 CP |
549 | |
550 | out1: | |
af601e46 | 551 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b EP |
552 | "policy loaded auid=%u ses=%u", |
553 | audit_get_loginuid(current), | |
554 | audit_get_sessionid(current)); | |
1da177e4 | 555 | out: |
bb003079 | 556 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
557 | vfree(data); |
558 | return length; | |
559 | } | |
560 | ||
9c2e08c5 | 561 | static const struct file_operations sel_load_ops = { |
1da177e4 | 562 | .write = sel_write_load, |
57a62c23 | 563 | .llseek = generic_file_llseek, |
1da177e4 LT |
564 | }; |
565 | ||
1872981b | 566 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 567 | { |
b77a493b | 568 | char *canon = NULL; |
ce9982d0 | 569 | u32 sid, len; |
1da177e4 LT |
570 | ssize_t length; |
571 | ||
572 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
573 | if (length) | |
b77a493b | 574 | goto out; |
1da177e4 | 575 | |
ce9982d0 | 576 | length = security_context_to_sid(buf, size, &sid); |
b77a493b EP |
577 | if (length) |
578 | goto out; | |
1da177e4 | 579 | |
ce9982d0 | 580 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
581 | if (length) |
582 | goto out; | |
ce9982d0 | 583 | |
b77a493b | 584 | length = -ERANGE; |
ce9982d0 | 585 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
586 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
587 | "payload max\n", __func__, len); | |
1da177e4 | 588 | goto out; |
ce9982d0 | 589 | } |
1da177e4 | 590 | |
ce9982d0 SS |
591 | memcpy(buf, canon, len); |
592 | length = len; | |
1da177e4 | 593 | out: |
ce9982d0 | 594 | kfree(canon); |
1da177e4 LT |
595 | return length; |
596 | } | |
597 | ||
1da177e4 LT |
598 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
599 | size_t count, loff_t *ppos) | |
600 | { | |
601 | char tmpbuf[TMPBUFLEN]; | |
602 | ssize_t length; | |
603 | ||
604 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
605 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
606 | } | |
607 | ||
1872981b | 608 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
609 | size_t count, loff_t *ppos) |
610 | { | |
b77a493b | 611 | char *page = NULL; |
1da177e4 LT |
612 | ssize_t length; |
613 | unsigned int new_value; | |
614 | ||
615 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
616 | if (length) | |
b77a493b | 617 | goto out; |
1da177e4 | 618 | |
b77a493b | 619 | length = -ENOMEM; |
bfd51626 | 620 | if (count >= PAGE_SIZE) |
b77a493b EP |
621 | goto out; |
622 | ||
623 | /* No partial writes. */ | |
624 | length = -EINVAL; | |
625 | if (*ppos != 0) | |
626 | goto out; | |
627 | ||
628 | length = -ENOMEM; | |
1872981b | 629 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 630 | if (!page) |
b77a493b EP |
631 | goto out; |
632 | ||
1da177e4 LT |
633 | length = -EFAULT; |
634 | if (copy_from_user(page, buf, count)) | |
635 | goto out; | |
636 | ||
637 | length = -EINVAL; | |
638 | if (sscanf(page, "%u", &new_value) != 1) | |
639 | goto out; | |
640 | ||
641 | selinux_checkreqprot = new_value ? 1 : 0; | |
642 | length = count; | |
643 | out: | |
644 | free_page((unsigned long) page); | |
645 | return length; | |
646 | } | |
9c2e08c5 | 647 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
648 | .read = sel_read_checkreqprot, |
649 | .write = sel_write_checkreqprot, | |
57a62c23 | 650 | .llseek = generic_file_llseek, |
1da177e4 LT |
651 | }; |
652 | ||
653 | /* | |
654 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
655 | */ | |
1872981b EP |
656 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
657 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
658 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
659 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
660 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
661 | |
662 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
663 | [SEL_ACCESS] = sel_write_access, | |
664 | [SEL_CREATE] = sel_write_create, | |
665 | [SEL_RELABEL] = sel_write_relabel, | |
666 | [SEL_USER] = sel_write_user, | |
667 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 668 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
669 | }; |
670 | ||
671 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
672 | { | |
1872981b | 673 | ino_t ino = file->f_path.dentry->d_inode->i_ino; |
1da177e4 LT |
674 | char *data; |
675 | ssize_t rv; | |
676 | ||
6e20a64a | 677 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
678 | return -EINVAL; |
679 | ||
680 | data = simple_transaction_get(file, buf, size); | |
681 | if (IS_ERR(data)) | |
682 | return PTR_ERR(data); | |
683 | ||
1872981b EP |
684 | rv = write_op[ino](file, data, size); |
685 | if (rv > 0) { | |
1da177e4 LT |
686 | simple_transaction_set(file, rv); |
687 | rv = size; | |
688 | } | |
689 | return rv; | |
690 | } | |
691 | ||
9c2e08c5 | 692 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
693 | .write = selinux_transaction_write, |
694 | .read = simple_transaction_read, | |
695 | .release = simple_transaction_release, | |
57a62c23 | 696 | .llseek = generic_file_llseek, |
1da177e4 LT |
697 | }; |
698 | ||
699 | /* | |
700 | * payload - write methods | |
701 | * If the method has a response, the response should be put in buf, | |
702 | * and the length returned. Otherwise return 0 or and -error. | |
703 | */ | |
704 | ||
1872981b | 705 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 706 | { |
b77a493b | 707 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
708 | u32 ssid, tsid; |
709 | u16 tclass; | |
1da177e4 LT |
710 | struct av_decision avd; |
711 | ssize_t length; | |
712 | ||
713 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
714 | if (length) | |
b77a493b | 715 | goto out; |
1da177e4 LT |
716 | |
717 | length = -ENOMEM; | |
c1a7368a | 718 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 719 | if (!scon) |
b77a493b | 720 | goto out; |
1da177e4 | 721 | |
b77a493b | 722 | length = -ENOMEM; |
c1a7368a | 723 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
724 | if (!tcon) |
725 | goto out; | |
1da177e4 LT |
726 | |
727 | length = -EINVAL; | |
19439d05 | 728 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 729 | goto out; |
1da177e4 | 730 | |
c1a7368a | 731 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
732 | if (length) |
733 | goto out; | |
734 | ||
c1a7368a | 735 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
736 | if (length) |
737 | goto out; | |
1da177e4 | 738 | |
19439d05 | 739 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
740 | |
741 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 742 | "%x %x %x %x %u %x", |
f1c6381a | 743 | avd.allowed, 0xffffffff, |
1da177e4 | 744 | avd.auditallow, avd.auditdeny, |
8a6f83af | 745 | avd.seqno, avd.flags); |
1da177e4 | 746 | out: |
b77a493b | 747 | kfree(tcon); |
1da177e4 LT |
748 | kfree(scon); |
749 | return length; | |
750 | } | |
751 | ||
0f7e4c33 KK |
752 | static inline int hexcode_to_int(int code) { |
753 | if (code == '\0' || !isxdigit(code)) | |
754 | return -1; | |
755 | if (isdigit(code)) | |
756 | return code - '0'; | |
757 | return tolower(code) - 'a' + 10; | |
758 | } | |
759 | ||
1872981b | 760 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 761 | { |
b77a493b | 762 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 763 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
764 | u32 ssid, tsid, newsid; |
765 | u16 tclass; | |
766 | ssize_t length; | |
b77a493b | 767 | char *newcon = NULL; |
1da177e4 | 768 | u32 len; |
f50a3ec9 | 769 | int nargs; |
1da177e4 LT |
770 | |
771 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
772 | if (length) | |
b77a493b | 773 | goto out; |
1da177e4 LT |
774 | |
775 | length = -ENOMEM; | |
c1a7368a | 776 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 777 | if (!scon) |
b77a493b | 778 | goto out; |
1da177e4 | 779 | |
b77a493b | 780 | length = -ENOMEM; |
c1a7368a | 781 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
782 | if (!tcon) |
783 | goto out; | |
1da177e4 | 784 | |
f50a3ec9 KK |
785 | length = -ENOMEM; |
786 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
787 | if (!namebuf) | |
788 | goto out; | |
789 | ||
1da177e4 | 790 | length = -EINVAL; |
f50a3ec9 KK |
791 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
792 | if (nargs < 3 || nargs > 4) | |
b77a493b | 793 | goto out; |
0f7e4c33 KK |
794 | if (nargs == 4) { |
795 | /* | |
796 | * If and when the name of new object to be queried contains | |
797 | * either whitespace or multibyte characters, they shall be | |
798 | * encoded based on the percentage-encoding rule. | |
799 | * If not encoded, the sscanf logic picks up only left-half | |
800 | * of the supplied name; splitted by a whitespace unexpectedly. | |
801 | */ | |
802 | char *r, *w; | |
803 | int c1, c2; | |
804 | ||
805 | r = w = namebuf; | |
806 | do { | |
807 | c1 = *r++; | |
808 | if (c1 == '+') | |
809 | c1 = ' '; | |
810 | else if (c1 == '%') { | |
811 | if ((c1 = hexcode_to_int(*r++)) < 0) | |
812 | goto out; | |
813 | if ((c2 = hexcode_to_int(*r++)) < 0) | |
814 | goto out; | |
815 | c1 = (c1 << 4) | c2; | |
816 | } | |
817 | *w++ = c1; | |
818 | } while (c1 != '\0'); | |
819 | ||
f50a3ec9 | 820 | objname = namebuf; |
0f7e4c33 | 821 | } |
1da177e4 | 822 | |
c1a7368a | 823 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
824 | if (length) |
825 | goto out; | |
826 | ||
c1a7368a | 827 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
828 | if (length) |
829 | goto out; | |
1da177e4 | 830 | |
f50a3ec9 KK |
831 | length = security_transition_sid_user(ssid, tsid, tclass, |
832 | objname, &newsid); | |
b77a493b EP |
833 | if (length) |
834 | goto out; | |
1da177e4 LT |
835 | |
836 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
837 | if (length) |
838 | goto out; | |
1da177e4 | 839 | |
b77a493b | 840 | length = -ERANGE; |
1da177e4 | 841 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
842 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
843 | "payload max\n", __func__, len); | |
b77a493b | 844 | goto out; |
1da177e4 LT |
845 | } |
846 | ||
847 | memcpy(buf, newcon, len); | |
848 | length = len; | |
b77a493b | 849 | out: |
1da177e4 | 850 | kfree(newcon); |
f50a3ec9 | 851 | kfree(namebuf); |
1da177e4 | 852 | kfree(tcon); |
1da177e4 LT |
853 | kfree(scon); |
854 | return length; | |
855 | } | |
856 | ||
1872981b | 857 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 858 | { |
b77a493b | 859 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
860 | u32 ssid, tsid, newsid; |
861 | u16 tclass; | |
862 | ssize_t length; | |
b77a493b | 863 | char *newcon = NULL; |
1da177e4 LT |
864 | u32 len; |
865 | ||
866 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
867 | if (length) | |
b77a493b | 868 | goto out; |
1da177e4 LT |
869 | |
870 | length = -ENOMEM; | |
c1a7368a | 871 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 872 | if (!scon) |
b77a493b | 873 | goto out; |
1da177e4 | 874 | |
b77a493b | 875 | length = -ENOMEM; |
c1a7368a | 876 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
877 | if (!tcon) |
878 | goto out; | |
1da177e4 LT |
879 | |
880 | length = -EINVAL; | |
881 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 882 | goto out; |
1da177e4 | 883 | |
c1a7368a | 884 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
885 | if (length) |
886 | goto out; | |
887 | ||
c1a7368a | 888 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
889 | if (length) |
890 | goto out; | |
1da177e4 LT |
891 | |
892 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
893 | if (length) |
894 | goto out; | |
1da177e4 LT |
895 | |
896 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
897 | if (length) |
898 | goto out; | |
1da177e4 | 899 | |
b77a493b EP |
900 | length = -ERANGE; |
901 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
902 | goto out; | |
1da177e4 LT |
903 | |
904 | memcpy(buf, newcon, len); | |
905 | length = len; | |
b77a493b | 906 | out: |
1da177e4 | 907 | kfree(newcon); |
1da177e4 | 908 | kfree(tcon); |
1da177e4 LT |
909 | kfree(scon); |
910 | return length; | |
911 | } | |
912 | ||
1872981b | 913 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 914 | { |
b77a493b EP |
915 | char *con = NULL, *user = NULL, *ptr; |
916 | u32 sid, *sids = NULL; | |
1da177e4 LT |
917 | ssize_t length; |
918 | char *newcon; | |
919 | int i, rc; | |
920 | u32 len, nsids; | |
921 | ||
922 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
923 | if (length) | |
6eab04a8 | 924 | goto out; |
1da177e4 LT |
925 | |
926 | length = -ENOMEM; | |
c1a7368a | 927 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 928 | if (!con) |
6eab04a8 | 929 | goto out; |
1da177e4 | 930 | |
b77a493b | 931 | length = -ENOMEM; |
c1a7368a | 932 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
933 | if (!user) |
934 | goto out; | |
1da177e4 LT |
935 | |
936 | length = -EINVAL; | |
937 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 938 | goto out; |
1da177e4 | 939 | |
c1a7368a | 940 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
b77a493b EP |
941 | if (length) |
942 | goto out; | |
1da177e4 LT |
943 | |
944 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
945 | if (length) |
946 | goto out; | |
1da177e4 LT |
947 | |
948 | length = sprintf(buf, "%u", nsids) + 1; | |
949 | ptr = buf + length; | |
950 | for (i = 0; i < nsids; i++) { | |
951 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
952 | if (rc) { | |
953 | length = rc; | |
b77a493b | 954 | goto out; |
1da177e4 LT |
955 | } |
956 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
957 | kfree(newcon); | |
958 | length = -ERANGE; | |
b77a493b | 959 | goto out; |
1da177e4 LT |
960 | } |
961 | memcpy(ptr, newcon, len); | |
962 | kfree(newcon); | |
963 | ptr += len; | |
964 | length += len; | |
965 | } | |
b77a493b | 966 | out: |
1da177e4 | 967 | kfree(sids); |
1da177e4 | 968 | kfree(user); |
1da177e4 LT |
969 | kfree(con); |
970 | return length; | |
971 | } | |
972 | ||
1872981b | 973 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 974 | { |
b77a493b | 975 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
976 | u32 ssid, tsid, newsid; |
977 | u16 tclass; | |
978 | ssize_t length; | |
b77a493b | 979 | char *newcon = NULL; |
1da177e4 LT |
980 | u32 len; |
981 | ||
982 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
983 | if (length) | |
b77a493b | 984 | goto out; |
1da177e4 LT |
985 | |
986 | length = -ENOMEM; | |
c1a7368a | 987 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 988 | if (!scon) |
6eab04a8 | 989 | goto out; |
1da177e4 | 990 | |
b77a493b | 991 | length = -ENOMEM; |
c1a7368a | 992 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
993 | if (!tcon) |
994 | goto out; | |
1da177e4 LT |
995 | |
996 | length = -EINVAL; | |
997 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 998 | goto out; |
1da177e4 | 999 | |
c1a7368a | 1000 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
1001 | if (length) |
1002 | goto out; | |
1003 | ||
c1a7368a | 1004 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
1005 | if (length) |
1006 | goto out; | |
1da177e4 LT |
1007 | |
1008 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1009 | if (length) |
1010 | goto out; | |
1da177e4 LT |
1011 | |
1012 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1013 | if (length) |
1014 | goto out; | |
1da177e4 | 1015 | |
b77a493b | 1016 | length = -ERANGE; |
1da177e4 | 1017 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1018 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1019 | "payload max\n", __func__, len); | |
b77a493b | 1020 | goto out; |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | memcpy(buf, newcon, len); | |
1024 | length = len; | |
b77a493b | 1025 | out: |
1da177e4 | 1026 | kfree(newcon); |
1da177e4 | 1027 | kfree(tcon); |
1da177e4 LT |
1028 | kfree(scon); |
1029 | return length; | |
1030 | } | |
1031 | ||
1032 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1033 | { | |
1034 | struct inode *ret = new_inode(sb); | |
1035 | ||
1036 | if (ret) { | |
1037 | ret->i_mode = mode; | |
1da177e4 LT |
1038 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1039 | } | |
1040 | return ret; | |
1041 | } | |
1042 | ||
1da177e4 LT |
1043 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1044 | size_t count, loff_t *ppos) | |
1045 | { | |
1046 | char *page = NULL; | |
1047 | ssize_t length; | |
1da177e4 LT |
1048 | ssize_t ret; |
1049 | int cur_enforcing; | |
d313f948 SS |
1050 | struct inode *inode = filep->f_path.dentry->d_inode; |
1051 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1052 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1053 | |
bb003079 | 1054 | mutex_lock(&sel_mutex); |
1da177e4 | 1055 | |
b77a493b EP |
1056 | ret = -EINVAL; |
1057 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1058 | goto out; |
1da177e4 | 1059 | |
b77a493b | 1060 | ret = -ENOMEM; |
1872981b | 1061 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1062 | if (!page) |
1da177e4 | 1063 | goto out; |
1da177e4 | 1064 | |
d313f948 | 1065 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1066 | if (cur_enforcing < 0) { |
1067 | ret = cur_enforcing; | |
1068 | goto out; | |
1069 | } | |
1da177e4 | 1070 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1071 | bool_pending_values[index]); |
68bdcf28 | 1072 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1073 | out: |
bb003079 | 1074 | mutex_unlock(&sel_mutex); |
b77a493b | 1075 | free_page((unsigned long)page); |
1da177e4 LT |
1076 | return ret; |
1077 | } | |
1078 | ||
1079 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1080 | size_t count, loff_t *ppos) | |
1081 | { | |
1082 | char *page = NULL; | |
d313f948 | 1083 | ssize_t length; |
1da177e4 | 1084 | int new_value; |
d313f948 SS |
1085 | struct inode *inode = filep->f_path.dentry->d_inode; |
1086 | unsigned index = inode->i_ino & SEL_INO_MASK; | |
1087 | const char *name = filep->f_path.dentry->d_name.name; | |
1da177e4 | 1088 | |
bb003079 | 1089 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1090 | |
1091 | length = task_has_security(current, SECURITY__SETBOOL); | |
1092 | if (length) | |
1093 | goto out; | |
1094 | ||
b77a493b EP |
1095 | length = -EINVAL; |
1096 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1097 | goto out; |
d313f948 | 1098 | |
b77a493b EP |
1099 | length = -ENOMEM; |
1100 | if (count >= PAGE_SIZE) | |
1da177e4 | 1101 | goto out; |
d313f948 | 1102 | |
b77a493b EP |
1103 | /* No partial writes. */ |
1104 | length = -EINVAL; | |
1105 | if (*ppos != 0) | |
1da177e4 | 1106 | goto out; |
b77a493b EP |
1107 | |
1108 | length = -ENOMEM; | |
1872981b | 1109 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1110 | if (!page) |
1da177e4 | 1111 | goto out; |
1da177e4 | 1112 | |
d313f948 | 1113 | length = -EFAULT; |
1da177e4 LT |
1114 | if (copy_from_user(page, buf, count)) |
1115 | goto out; | |
1116 | ||
1117 | length = -EINVAL; | |
1118 | if (sscanf(page, "%d", &new_value) != 1) | |
1119 | goto out; | |
1120 | ||
1121 | if (new_value) | |
1122 | new_value = 1; | |
1123 | ||
d313f948 | 1124 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1125 | length = count; |
1126 | ||
1127 | out: | |
bb003079 | 1128 | mutex_unlock(&sel_mutex); |
b77a493b | 1129 | free_page((unsigned long) page); |
1da177e4 LT |
1130 | return length; |
1131 | } | |
1132 | ||
9c2e08c5 | 1133 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1134 | .read = sel_read_bool, |
1135 | .write = sel_write_bool, | |
57a62c23 | 1136 | .llseek = generic_file_llseek, |
1da177e4 LT |
1137 | }; |
1138 | ||
1139 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1140 | const char __user *buf, | |
1141 | size_t count, loff_t *ppos) | |
1142 | { | |
1143 | char *page = NULL; | |
d313f948 | 1144 | ssize_t length; |
1da177e4 LT |
1145 | int new_value; |
1146 | ||
bb003079 | 1147 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1148 | |
1149 | length = task_has_security(current, SECURITY__SETBOOL); | |
1150 | if (length) | |
1151 | goto out; | |
1152 | ||
b77a493b EP |
1153 | length = -ENOMEM; |
1154 | if (count >= PAGE_SIZE) | |
1da177e4 | 1155 | goto out; |
b77a493b EP |
1156 | |
1157 | /* No partial writes. */ | |
1158 | length = -EINVAL; | |
1159 | if (*ppos != 0) | |
1da177e4 | 1160 | goto out; |
b77a493b EP |
1161 | |
1162 | length = -ENOMEM; | |
1872981b | 1163 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1164 | if (!page) |
1da177e4 | 1165 | goto out; |
1da177e4 | 1166 | |
d313f948 | 1167 | length = -EFAULT; |
1da177e4 LT |
1168 | if (copy_from_user(page, buf, count)) |
1169 | goto out; | |
1170 | ||
1171 | length = -EINVAL; | |
1172 | if (sscanf(page, "%d", &new_value) != 1) | |
1173 | goto out; | |
1174 | ||
b77a493b | 1175 | length = 0; |
1872981b | 1176 | if (new_value && bool_pending_values) |
b77a493b | 1177 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1178 | |
b77a493b EP |
1179 | if (!length) |
1180 | length = count; | |
1da177e4 LT |
1181 | |
1182 | out: | |
bb003079 | 1183 | mutex_unlock(&sel_mutex); |
b77a493b | 1184 | free_page((unsigned long) page); |
1da177e4 LT |
1185 | return length; |
1186 | } | |
1187 | ||
9c2e08c5 | 1188 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1189 | .write = sel_commit_bools_write, |
57a62c23 | 1190 | .llseek = generic_file_llseek, |
1da177e4 LT |
1191 | }; |
1192 | ||
0c92d7c7 | 1193 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1194 | { |
0955dc03 | 1195 | struct list_head *node; |
1da177e4 | 1196 | |
2fd6b7f5 | 1197 | spin_lock(&de->d_lock); |
1da177e4 LT |
1198 | node = de->d_subdirs.next; |
1199 | while (node != &de->d_subdirs) { | |
5160ee6f | 1200 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1201 | |
1202 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1203 | list_del_init(node); |
1204 | ||
1205 | if (d->d_inode) { | |
dc0474be | 1206 | dget_dlock(d); |
2fd6b7f5 NP |
1207 | spin_unlock(&de->d_lock); |
1208 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1209 | d_delete(d); |
1210 | simple_unlink(de->d_inode, d); | |
1211 | dput(d); | |
2fd6b7f5 NP |
1212 | spin_lock(&de->d_lock); |
1213 | } else | |
1214 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1215 | node = de->d_subdirs.next; |
1216 | } | |
1217 | ||
2fd6b7f5 | 1218 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | #define BOOL_DIR_NAME "booleans" | |
1222 | ||
1223 | static int sel_make_bools(void) | |
1224 | { | |
b77a493b | 1225 | int i, ret; |
1da177e4 LT |
1226 | ssize_t len; |
1227 | struct dentry *dentry = NULL; | |
1228 | struct dentry *dir = bool_dir; | |
1229 | struct inode *inode = NULL; | |
1230 | struct inode_security_struct *isec; | |
1231 | char **names = NULL, *page; | |
1232 | int num; | |
1233 | int *values = NULL; | |
1234 | u32 sid; | |
1235 | ||
1236 | /* remove any existing files */ | |
8007f102 XF |
1237 | for (i = 0; i < bool_num; i++) |
1238 | kfree(bool_pending_names[i]); | |
d313f948 | 1239 | kfree(bool_pending_names); |
9a5f04bf | 1240 | kfree(bool_pending_values); |
d313f948 | 1241 | bool_pending_names = NULL; |
20c19e41 | 1242 | bool_pending_values = NULL; |
1da177e4 | 1243 | |
0c92d7c7 | 1244 | sel_remove_entries(dir); |
1da177e4 | 1245 | |
b77a493b | 1246 | ret = -ENOMEM; |
1872981b EP |
1247 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1248 | if (!page) | |
b77a493b | 1249 | goto out; |
1da177e4 LT |
1250 | |
1251 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1252 | if (ret) |
1da177e4 LT |
1253 | goto out; |
1254 | ||
1255 | for (i = 0; i < num; i++) { | |
b77a493b | 1256 | ret = -ENOMEM; |
1da177e4 | 1257 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1258 | if (!dentry) |
1259 | goto out; | |
1260 | ||
1261 | ret = -ENOMEM; | |
1da177e4 | 1262 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1263 | if (!inode) |
1264 | goto out; | |
1da177e4 | 1265 | |
b77a493b | 1266 | ret = -EINVAL; |
1da177e4 | 1267 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1268 | if (len < 0) |
1269 | goto out; | |
1270 | ||
1271 | ret = -ENAMETOOLONG; | |
1272 | if (len >= PAGE_SIZE) | |
1273 | goto out; | |
1274 | ||
1872981b EP |
1275 | isec = (struct inode_security_struct *)inode->i_security; |
1276 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1277 | if (ret) | |
b77a493b EP |
1278 | goto out; |
1279 | ||
1da177e4 LT |
1280 | isec->sid = sid; |
1281 | isec->initialized = 1; | |
1282 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1283 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1284 | d_add(dentry, inode); |
1285 | } | |
1286 | bool_num = num; | |
d313f948 | 1287 | bool_pending_names = names; |
1da177e4 | 1288 | bool_pending_values = values; |
b77a493b EP |
1289 | |
1290 | free_page((unsigned long)page); | |
1291 | return 0; | |
1da177e4 LT |
1292 | out: |
1293 | free_page((unsigned long)page); | |
b77a493b | 1294 | |
1da177e4 | 1295 | if (names) { |
9a5f04bf JJ |
1296 | for (i = 0; i < num; i++) |
1297 | kfree(names[i]); | |
1da177e4 LT |
1298 | kfree(names); |
1299 | } | |
20c19e41 | 1300 | kfree(values); |
0c92d7c7 | 1301 | sel_remove_entries(dir); |
b77a493b EP |
1302 | |
1303 | return ret; | |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | #define NULL_FILE_NAME "null" | |
1307 | ||
1872981b | 1308 | struct dentry *selinux_null; |
1da177e4 LT |
1309 | |
1310 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1311 | size_t count, loff_t *ppos) | |
1312 | { | |
1313 | char tmpbuf[TMPBUFLEN]; | |
1314 | ssize_t length; | |
1315 | ||
1316 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1317 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1318 | } | |
1319 | ||
1872981b EP |
1320 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1321 | const char __user *buf, | |
1da177e4 LT |
1322 | size_t count, loff_t *ppos) |
1323 | ||
1324 | { | |
b77a493b | 1325 | char *page = NULL; |
1da177e4 LT |
1326 | ssize_t ret; |
1327 | int new_value; | |
1328 | ||
b77a493b EP |
1329 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1330 | if (ret) | |
1da177e4 | 1331 | goto out; |
1da177e4 | 1332 | |
b77a493b EP |
1333 | ret = -ENOMEM; |
1334 | if (count >= PAGE_SIZE) | |
1da177e4 | 1335 | goto out; |
1da177e4 | 1336 | |
b77a493b EP |
1337 | /* No partial writes. */ |
1338 | ret = -EINVAL; | |
1339 | if (*ppos != 0) | |
1340 | goto out; | |
1341 | ||
1342 | ret = -ENOMEM; | |
1872981b | 1343 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1344 | if (!page) |
1da177e4 | 1345 | goto out; |
1da177e4 | 1346 | |
b77a493b EP |
1347 | ret = -EFAULT; |
1348 | if (copy_from_user(page, buf, count)) | |
1349 | goto out; | |
1da177e4 | 1350 | |
b77a493b EP |
1351 | ret = -EINVAL; |
1352 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1353 | goto out; |
1da177e4 | 1354 | |
b77a493b EP |
1355 | avc_cache_threshold = new_value; |
1356 | ||
1da177e4 | 1357 | ret = count; |
1da177e4 | 1358 | out: |
b77a493b | 1359 | free_page((unsigned long)page); |
1da177e4 LT |
1360 | return ret; |
1361 | } | |
1362 | ||
1363 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1364 | size_t count, loff_t *ppos) | |
1365 | { | |
1366 | char *page; | |
b77a493b | 1367 | ssize_t length; |
1da177e4 LT |
1368 | |
1369 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1370 | if (!page) |
1371 | return -ENOMEM; | |
1372 | ||
1373 | length = avc_get_hash_stats(page); | |
1374 | if (length >= 0) | |
1375 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1376 | free_page((unsigned long)page); |
b77a493b EP |
1377 | |
1378 | return length; | |
1da177e4 LT |
1379 | } |
1380 | ||
9c2e08c5 | 1381 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1382 | .read = sel_read_avc_cache_threshold, |
1383 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1384 | .llseek = generic_file_llseek, |
1da177e4 LT |
1385 | }; |
1386 | ||
9c2e08c5 | 1387 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1388 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1389 | .llseek = generic_file_llseek, |
1da177e4 LT |
1390 | }; |
1391 | ||
1392 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1393 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1394 | { | |
1395 | int cpu; | |
1396 | ||
4f4b6c1a | 1397 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1398 | if (!cpu_possible(cpu)) |
1399 | continue; | |
1400 | *idx = cpu + 1; | |
1401 | return &per_cpu(avc_cache_stats, cpu); | |
1402 | } | |
1403 | return NULL; | |
1404 | } | |
1405 | ||
1406 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1407 | { | |
1408 | loff_t n = *pos - 1; | |
1409 | ||
1410 | if (*pos == 0) | |
1411 | return SEQ_START_TOKEN; | |
1412 | ||
1413 | return sel_avc_get_stat_idx(&n); | |
1414 | } | |
1415 | ||
1416 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1417 | { | |
1418 | return sel_avc_get_stat_idx(pos); | |
1419 | } | |
1420 | ||
1421 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1422 | { | |
1423 | struct avc_cache_stats *st = v; | |
1424 | ||
1425 | if (v == SEQ_START_TOKEN) | |
1426 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1427 | "frees\n"); | |
257313b2 LT |
1428 | else { |
1429 | unsigned int lookups = st->lookups; | |
1430 | unsigned int misses = st->misses; | |
1431 | unsigned int hits = lookups - misses; | |
1432 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1433 | hits, misses, st->allocations, | |
1da177e4 | 1434 | st->reclaims, st->frees); |
257313b2 | 1435 | } |
1da177e4 LT |
1436 | return 0; |
1437 | } | |
1438 | ||
1439 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1440 | { } | |
1441 | ||
1996a109 | 1442 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1443 | .start = sel_avc_stats_seq_start, |
1444 | .next = sel_avc_stats_seq_next, | |
1445 | .show = sel_avc_stats_seq_show, | |
1446 | .stop = sel_avc_stats_seq_stop, | |
1447 | }; | |
1448 | ||
1449 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1450 | { | |
1451 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1452 | } | |
1453 | ||
9c2e08c5 | 1454 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1455 | .open = sel_open_avc_cache_stats, |
1456 | .read = seq_read, | |
1457 | .llseek = seq_lseek, | |
1458 | .release = seq_release, | |
1459 | }; | |
1460 | #endif | |
1461 | ||
1462 | static int sel_make_avc_files(struct dentry *dir) | |
1463 | { | |
b77a493b | 1464 | int i; |
1da177e4 LT |
1465 | static struct tree_descr files[] = { |
1466 | { "cache_threshold", | |
1467 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1468 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1469 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1470 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1471 | #endif | |
1472 | }; | |
1473 | ||
6e20a64a | 1474 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1475 | struct inode *inode; |
1476 | struct dentry *dentry; | |
1477 | ||
1478 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1479 | if (!dentry) |
1480 | return -ENOMEM; | |
1da177e4 LT |
1481 | |
1482 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1483 | if (!inode) |
1484 | return -ENOMEM; | |
1485 | ||
1da177e4 | 1486 | inode->i_fop = files[i].ops; |
6174eafc | 1487 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1488 | d_add(dentry, inode); |
1489 | } | |
b77a493b EP |
1490 | |
1491 | return 0; | |
1da177e4 LT |
1492 | } |
1493 | ||
1872981b | 1494 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1495 | size_t count, loff_t *ppos) |
1496 | { | |
1497 | struct inode *inode; | |
1498 | char *con; | |
1499 | u32 sid, len; | |
1500 | ssize_t ret; | |
1501 | ||
1502 | inode = file->f_path.dentry->d_inode; | |
1503 | sid = inode->i_ino&SEL_INO_MASK; | |
1504 | ret = security_sid_to_context(sid, &con, &len); | |
b77a493b | 1505 | if (ret) |
f0ee2e46 JC |
1506 | return ret; |
1507 | ||
1508 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1509 | kfree(con); | |
1510 | return ret; | |
1511 | } | |
1512 | ||
1513 | static const struct file_operations sel_initcon_ops = { | |
1514 | .read = sel_read_initcon, | |
57a62c23 | 1515 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1516 | }; |
1517 | ||
1518 | static int sel_make_initcon_files(struct dentry *dir) | |
1519 | { | |
b77a493b | 1520 | int i; |
f0ee2e46 JC |
1521 | |
1522 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1523 | struct inode *inode; | |
1524 | struct dentry *dentry; | |
1525 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1526 | if (!dentry) |
1527 | return -ENOMEM; | |
f0ee2e46 JC |
1528 | |
1529 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1530 | if (!inode) |
1531 | return -ENOMEM; | |
1532 | ||
f0ee2e46 JC |
1533 | inode->i_fop = &sel_initcon_ops; |
1534 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1535 | d_add(dentry, inode); | |
1536 | } | |
b77a493b EP |
1537 | |
1538 | return 0; | |
f0ee2e46 JC |
1539 | } |
1540 | ||
e47c8fc5 CP |
1541 | static inline unsigned int sel_div(unsigned long a, unsigned long b) |
1542 | { | |
1543 | return a / b - (a % b < 0); | |
1544 | } | |
1545 | ||
1546 | static inline unsigned long sel_class_to_ino(u16 class) | |
1547 | { | |
1548 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1549 | } | |
1550 | ||
1551 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1552 | { | |
1553 | return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1); | |
1554 | } | |
1555 | ||
1556 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1557 | { | |
1558 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1559 | } | |
1560 | ||
1561 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1562 | { | |
1563 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1564 | } | |
1565 | ||
1872981b | 1566 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1567 | size_t count, loff_t *ppos) |
1568 | { | |
1569 | ssize_t rc, len; | |
1570 | char *page; | |
1571 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1572 | ||
1573 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1574 | if (!page) |
1575 | return -ENOMEM; | |
e47c8fc5 CP |
1576 | |
1577 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino)); | |
1578 | rc = simple_read_from_buffer(buf, count, ppos, page, len); | |
1579 | free_page((unsigned long)page); | |
b77a493b | 1580 | |
e47c8fc5 CP |
1581 | return rc; |
1582 | } | |
1583 | ||
1584 | static const struct file_operations sel_class_ops = { | |
1585 | .read = sel_read_class, | |
57a62c23 | 1586 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1587 | }; |
1588 | ||
1872981b | 1589 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1590 | size_t count, loff_t *ppos) |
1591 | { | |
1592 | ssize_t rc, len; | |
1593 | char *page; | |
1594 | unsigned long ino = file->f_path.dentry->d_inode->i_ino; | |
1595 | ||
1596 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1597 | if (!page) |
1598 | return -ENOMEM; | |
e47c8fc5 | 1599 | |
1872981b | 1600 | len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino)); |
e47c8fc5 CP |
1601 | rc = simple_read_from_buffer(buf, count, ppos, page, len); |
1602 | free_page((unsigned long)page); | |
b77a493b | 1603 | |
e47c8fc5 CP |
1604 | return rc; |
1605 | } | |
1606 | ||
1607 | static const struct file_operations sel_perm_ops = { | |
1608 | .read = sel_read_perm, | |
57a62c23 | 1609 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1610 | }; |
1611 | ||
3bb56b25 PM |
1612 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1613 | size_t count, loff_t *ppos) | |
1614 | { | |
1615 | int value; | |
1616 | char tmpbuf[TMPBUFLEN]; | |
1617 | ssize_t length; | |
1618 | unsigned long i_ino = file->f_path.dentry->d_inode->i_ino; | |
1619 | ||
1620 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1621 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1622 | ||
1623 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1624 | } | |
1625 | ||
1626 | static const struct file_operations sel_policycap_ops = { | |
1627 | .read = sel_read_policycap, | |
57a62c23 | 1628 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1629 | }; |
1630 | ||
e47c8fc5 CP |
1631 | static int sel_make_perm_files(char *objclass, int classvalue, |
1632 | struct dentry *dir) | |
1633 | { | |
b77a493b | 1634 | int i, rc, nperms; |
e47c8fc5 CP |
1635 | char **perms; |
1636 | ||
1637 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1638 | if (rc) | |
b77a493b | 1639 | return rc; |
e47c8fc5 CP |
1640 | |
1641 | for (i = 0; i < nperms; i++) { | |
1642 | struct inode *inode; | |
1643 | struct dentry *dentry; | |
1644 | ||
b77a493b | 1645 | rc = -ENOMEM; |
e47c8fc5 | 1646 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1647 | if (!dentry) |
1648 | goto out; | |
e47c8fc5 | 1649 | |
b77a493b | 1650 | rc = -ENOMEM; |
e47c8fc5 | 1651 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1652 | if (!inode) |
1653 | goto out; | |
1654 | ||
e47c8fc5 CP |
1655 | inode->i_fop = &sel_perm_ops; |
1656 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1657 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1658 | d_add(dentry, inode); |
1659 | } | |
b77a493b EP |
1660 | rc = 0; |
1661 | out: | |
e47c8fc5 CP |
1662 | for (i = 0; i < nperms; i++) |
1663 | kfree(perms[i]); | |
1664 | kfree(perms); | |
e47c8fc5 CP |
1665 | return rc; |
1666 | } | |
1667 | ||
1668 | static int sel_make_class_dir_entries(char *classname, int index, | |
1669 | struct dentry *dir) | |
1670 | { | |
1671 | struct dentry *dentry = NULL; | |
1672 | struct inode *inode = NULL; | |
1673 | int rc; | |
1674 | ||
1675 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1676 | if (!dentry) |
1677 | return -ENOMEM; | |
e47c8fc5 CP |
1678 | |
1679 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1680 | if (!inode) |
1681 | return -ENOMEM; | |
e47c8fc5 CP |
1682 | |
1683 | inode->i_fop = &sel_class_ops; | |
1684 | inode->i_ino = sel_class_to_ino(index); | |
1685 | d_add(dentry, inode); | |
1686 | ||
1687 | dentry = d_alloc_name(dir, "perms"); | |
b77a493b EP |
1688 | if (!dentry) |
1689 | return -ENOMEM; | |
e47c8fc5 CP |
1690 | |
1691 | rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino); | |
1692 | if (rc) | |
b77a493b | 1693 | return rc; |
e47c8fc5 CP |
1694 | |
1695 | rc = sel_make_perm_files(classname, index, dentry); | |
1696 | ||
e47c8fc5 CP |
1697 | return rc; |
1698 | } | |
1699 | ||
1700 | static void sel_remove_classes(void) | |
1701 | { | |
1702 | struct list_head *class_node; | |
1703 | ||
1704 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1705 | struct dentry *class_subdir = list_entry(class_node, | |
1706 | struct dentry, d_u.d_child); | |
1707 | struct list_head *class_subdir_node; | |
1708 | ||
1709 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1710 | struct dentry *d = list_entry(class_subdir_node, | |
1711 | struct dentry, d_u.d_child); | |
1712 | ||
1713 | if (d->d_inode) | |
1714 | if (d->d_inode->i_mode & S_IFDIR) | |
1715 | sel_remove_entries(d); | |
1716 | } | |
1717 | ||
1718 | sel_remove_entries(class_subdir); | |
1719 | } | |
1720 | ||
1721 | sel_remove_entries(class_dir); | |
1722 | } | |
1723 | ||
1724 | static int sel_make_classes(void) | |
1725 | { | |
b77a493b | 1726 | int rc, nclasses, i; |
e47c8fc5 CP |
1727 | char **classes; |
1728 | ||
1729 | /* delete any existing entries */ | |
1730 | sel_remove_classes(); | |
1731 | ||
1732 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1733 | if (rc) |
1734 | return rc; | |
e47c8fc5 CP |
1735 | |
1736 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1737 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1738 | |
1739 | for (i = 0; i < nclasses; i++) { | |
1740 | struct dentry *class_name_dir; | |
1741 | ||
b77a493b | 1742 | rc = -ENOMEM; |
e47c8fc5 | 1743 | class_name_dir = d_alloc_name(class_dir, classes[i]); |
b77a493b EP |
1744 | if (!class_name_dir) |
1745 | goto out; | |
e47c8fc5 CP |
1746 | |
1747 | rc = sel_make_dir(class_dir->d_inode, class_name_dir, | |
1748 | &last_class_ino); | |
1749 | if (rc) | |
b77a493b | 1750 | goto out; |
e47c8fc5 CP |
1751 | |
1752 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1753 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1754 | class_name_dir); |
1755 | if (rc) | |
b77a493b | 1756 | goto out; |
e47c8fc5 | 1757 | } |
b77a493b EP |
1758 | rc = 0; |
1759 | out: | |
e47c8fc5 CP |
1760 | for (i = 0; i < nclasses; i++) |
1761 | kfree(classes[i]); | |
1762 | kfree(classes); | |
e47c8fc5 CP |
1763 | return rc; |
1764 | } | |
1765 | ||
3bb56b25 PM |
1766 | static int sel_make_policycap(void) |
1767 | { | |
1768 | unsigned int iter; | |
1769 | struct dentry *dentry = NULL; | |
1770 | struct inode *inode = NULL; | |
1771 | ||
1772 | sel_remove_entries(policycap_dir); | |
1773 | ||
1774 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1775 | if (iter < ARRAY_SIZE(policycap_names)) | |
1776 | dentry = d_alloc_name(policycap_dir, | |
1777 | policycap_names[iter]); | |
1778 | else | |
1779 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1780 | ||
1781 | if (dentry == NULL) | |
1782 | return -ENOMEM; | |
1783 | ||
1784 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1785 | if (inode == NULL) | |
1786 | return -ENOMEM; | |
1787 | ||
1788 | inode->i_fop = &sel_policycap_ops; | |
1789 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1790 | d_add(dentry, inode); | |
1791 | } | |
1792 | ||
1793 | return 0; | |
1794 | } | |
1795 | ||
0dd4ae51 CP |
1796 | static int sel_make_dir(struct inode *dir, struct dentry *dentry, |
1797 | unsigned long *ino) | |
1da177e4 | 1798 | { |
1da177e4 LT |
1799 | struct inode *inode; |
1800 | ||
edb20fb5 | 1801 | inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO); |
b77a493b EP |
1802 | if (!inode) |
1803 | return -ENOMEM; | |
1804 | ||
1da177e4 LT |
1805 | inode->i_op = &simple_dir_inode_operations; |
1806 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1807 | inode->i_ino = ++(*ino); |
40e906f8 | 1808 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1809 | inc_nlink(inode); |
1da177e4 | 1810 | d_add(dentry, inode); |
edb20fb5 | 1811 | /* bump link count on parent directory, too */ |
d8c76e6f | 1812 | inc_nlink(dir); |
b77a493b EP |
1813 | |
1814 | return 0; | |
1da177e4 LT |
1815 | } |
1816 | ||
1872981b | 1817 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1818 | { |
1819 | int ret; | |
1820 | struct dentry *dentry; | |
edb20fb5 | 1821 | struct inode *inode, *root_inode; |
1da177e4 LT |
1822 | struct inode_security_struct *isec; |
1823 | ||
1824 | static struct tree_descr selinux_files[] = { | |
1825 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1826 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1827 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1828 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1829 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1830 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1831 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1832 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1833 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1834 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1835 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1836 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1837 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1838 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1839 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1840 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
cee74f47 | 1841 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR}, |
1da177e4 LT |
1842 | /* last one */ {""} |
1843 | }; | |
1844 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1845 | if (ret) | |
161ce45a | 1846 | goto err; |
1da177e4 | 1847 | |
edb20fb5 JM |
1848 | root_inode = sb->s_root->d_inode; |
1849 | ||
b77a493b | 1850 | ret = -ENOMEM; |
1da177e4 | 1851 | dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME); |
b77a493b | 1852 | if (!dentry) |
161ce45a | 1853 | goto err; |
1da177e4 | 1854 | |
0dd4ae51 | 1855 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
cde174a8 | 1856 | if (ret) |
161ce45a | 1857 | goto err; |
cde174a8 | 1858 | |
1da177e4 | 1859 | bool_dir = dentry; |
1da177e4 | 1860 | |
b77a493b | 1861 | ret = -ENOMEM; |
1da177e4 | 1862 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1863 | if (!dentry) |
161ce45a | 1864 | goto err; |
1da177e4 | 1865 | |
b77a493b | 1866 | ret = -ENOMEM; |
1da177e4 | 1867 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1868 | if (!inode) |
161ce45a | 1869 | goto err; |
b77a493b | 1870 | |
6174eafc | 1871 | inode->i_ino = ++sel_last_ino; |
1872981b | 1872 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1873 | isec->sid = SECINITSID_DEVNULL; |
1874 | isec->sclass = SECCLASS_CHR_FILE; | |
1875 | isec->initialized = 1; | |
1876 | ||
1877 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1878 | d_add(dentry, inode); | |
1879 | selinux_null = dentry; | |
1880 | ||
b77a493b | 1881 | ret = -ENOMEM; |
1da177e4 | 1882 | dentry = d_alloc_name(sb->s_root, "avc"); |
b77a493b | 1883 | if (!dentry) |
161ce45a | 1884 | goto err; |
1da177e4 | 1885 | |
0dd4ae51 | 1886 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
1da177e4 | 1887 | if (ret) |
161ce45a | 1888 | goto err; |
1da177e4 LT |
1889 | |
1890 | ret = sel_make_avc_files(dentry); | |
1891 | if (ret) | |
161ce45a | 1892 | goto err; |
f0ee2e46 | 1893 | |
b77a493b | 1894 | ret = -ENOMEM; |
f0ee2e46 | 1895 | dentry = d_alloc_name(sb->s_root, "initial_contexts"); |
b77a493b | 1896 | if (!dentry) |
f0ee2e46 | 1897 | goto err; |
f0ee2e46 | 1898 | |
0dd4ae51 | 1899 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); |
f0ee2e46 JC |
1900 | if (ret) |
1901 | goto err; | |
1902 | ||
1903 | ret = sel_make_initcon_files(dentry); | |
1904 | if (ret) | |
1905 | goto err; | |
1906 | ||
b77a493b | 1907 | ret = -ENOMEM; |
e47c8fc5 | 1908 | dentry = d_alloc_name(sb->s_root, "class"); |
b77a493b | 1909 | if (!dentry) |
e47c8fc5 | 1910 | goto err; |
e47c8fc5 CP |
1911 | |
1912 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1913 | if (ret) | |
1914 | goto err; | |
1915 | ||
1916 | class_dir = dentry; | |
1917 | ||
b77a493b | 1918 | ret = -ENOMEM; |
3bb56b25 | 1919 | dentry = d_alloc_name(sb->s_root, "policy_capabilities"); |
b77a493b | 1920 | if (!dentry) |
3bb56b25 | 1921 | goto err; |
3bb56b25 PM |
1922 | |
1923 | ret = sel_make_dir(root_inode, dentry, &sel_last_ino); | |
1924 | if (ret) | |
1925 | goto err; | |
1926 | ||
1927 | policycap_dir = dentry; | |
1928 | ||
b77a493b | 1929 | return 0; |
161ce45a | 1930 | err: |
744ba35e EP |
1931 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1932 | __func__); | |
b77a493b | 1933 | return ret; |
1da177e4 LT |
1934 | } |
1935 | ||
fc14f2fe AV |
1936 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1937 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1938 | { |
fc14f2fe | 1939 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1940 | } |
1941 | ||
1942 | static struct file_system_type sel_fs_type = { | |
1943 | .name = "selinuxfs", | |
fc14f2fe | 1944 | .mount = sel_mount, |
1da177e4 LT |
1945 | .kill_sb = kill_litter_super, |
1946 | }; | |
1947 | ||
1948 | struct vfsmount *selinuxfs_mount; | |
7a627e3b | 1949 | static struct kobject *selinuxfs_kobj; |
1da177e4 LT |
1950 | |
1951 | static int __init init_sel_fs(void) | |
1952 | { | |
1953 | int err; | |
1954 | ||
1955 | if (!selinux_enabled) | |
1956 | return 0; | |
7a627e3b GKH |
1957 | |
1958 | selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj); | |
1959 | if (!selinuxfs_kobj) | |
1960 | return -ENOMEM; | |
1961 | ||
1da177e4 | 1962 | err = register_filesystem(&sel_fs_type); |
7a627e3b GKH |
1963 | if (err) { |
1964 | kobject_put(selinuxfs_kobj); | |
b77a493b | 1965 | return err; |
7a627e3b | 1966 | } |
b77a493b EP |
1967 | |
1968 | selinuxfs_mount = kern_mount(&sel_fs_type); | |
1969 | if (IS_ERR(selinuxfs_mount)) { | |
1970 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1971 | err = PTR_ERR(selinuxfs_mount); | |
1972 | selinuxfs_mount = NULL; | |
1da177e4 | 1973 | } |
b77a493b | 1974 | |
1da177e4 LT |
1975 | return err; |
1976 | } | |
1977 | ||
1978 | __initcall(init_sel_fs); | |
1979 | ||
1980 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1981 | void exit_sel_fs(void) | |
1982 | { | |
7a627e3b | 1983 | kobject_put(selinuxfs_kobj); |
423e0ab0 | 1984 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1985 | unregister_filesystem(&sel_fs_type); |
1986 | } | |
1987 | #endif |