]>
Commit | Line | Data |
---|---|---|
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 | 46 | "network_peer_controls", |
2be4d74f CP |
47 | "open_perms", |
48 | "redhat1", | |
49 | "always_check_network" | |
3bb56b25 PM |
50 | }; |
51 | ||
1da177e4 LT |
52 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
53 | ||
54 | static int __init checkreqprot_setup(char *str) | |
55 | { | |
f5269710 EP |
56 | unsigned long checkreqprot; |
57 | if (!strict_strtoul(str, 0, &checkreqprot)) | |
58 | selinux_checkreqprot = checkreqprot ? 1 : 0; | |
1da177e4 LT |
59 | return 1; |
60 | } | |
61 | __setup("checkreqprot=", checkreqprot_setup); | |
62 | ||
bb003079 | 63 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
64 | |
65 | /* global data for booleans */ | |
1872981b EP |
66 | static struct dentry *bool_dir; |
67 | static int bool_num; | |
d313f948 | 68 | static char **bool_pending_names; |
1872981b | 69 | static int *bool_pending_values; |
1da177e4 | 70 | |
e47c8fc5 | 71 | /* global data for classes */ |
1872981b | 72 | static struct dentry *class_dir; |
e47c8fc5 CP |
73 | static unsigned long last_class_ino; |
74 | ||
cee74f47 EP |
75 | static char policy_opened; |
76 | ||
3bb56b25 | 77 | /* global data for policy capabilities */ |
1872981b | 78 | static struct dentry *policycap_dir; |
3bb56b25 | 79 | |
1da177e4 LT |
80 | /* Check whether a task is allowed to use a security operation. */ |
81 | static int task_has_security(struct task_struct *tsk, | |
82 | u32 perms) | |
83 | { | |
c69e8d9c DH |
84 | const struct task_security_struct *tsec; |
85 | u32 sid = 0; | |
86 | ||
87 | rcu_read_lock(); | |
88 | tsec = __task_cred(tsk)->security; | |
89 | if (tsec) | |
90 | sid = tsec->sid; | |
91 | rcu_read_unlock(); | |
1da177e4 LT |
92 | if (!tsec) |
93 | return -EACCES; | |
94 | ||
c69e8d9c | 95 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
96 | SECCLASS_SECURITY, perms, NULL); |
97 | } | |
98 | ||
99 | enum sel_inos { | |
100 | SEL_ROOT_INO = 2, | |
101 | SEL_LOAD, /* load policy */ | |
102 | SEL_ENFORCE, /* get or set enforcing status */ | |
103 | SEL_CONTEXT, /* validate context */ | |
104 | SEL_ACCESS, /* compute access decision */ | |
105 | SEL_CREATE, /* compute create labeling decision */ | |
106 | SEL_RELABEL, /* compute relabeling decision */ | |
107 | SEL_USER, /* compute reachable user contexts */ | |
108 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
109 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
110 | SEL_MLS, /* return if MLS policy is enabled */ | |
111 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
112 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
113 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 114 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
115 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
116 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 117 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 118 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
6174eafc | 119 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
120 | }; |
121 | ||
6174eafc JC |
122 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
123 | ||
3bb56b25 PM |
124 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
125 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
126 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
127 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
128 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 129 | |
1da177e4 LT |
130 | #define TMPBUFLEN 12 |
131 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
132 | size_t count, loff_t *ppos) | |
133 | { | |
134 | char tmpbuf[TMPBUFLEN]; | |
135 | ssize_t length; | |
136 | ||
137 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
138 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
139 | } | |
140 | ||
141 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 142 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
143 | size_t count, loff_t *ppos) |
144 | ||
145 | { | |
b77a493b | 146 | char *page = NULL; |
1da177e4 LT |
147 | ssize_t length; |
148 | int new_value; | |
149 | ||
b77a493b | 150 | length = -ENOMEM; |
bfd51626 | 151 | if (count >= PAGE_SIZE) |
b77a493b EP |
152 | goto out; |
153 | ||
154 | /* No partial writes. */ | |
155 | length = EINVAL; | |
156 | if (*ppos != 0) | |
157 | goto out; | |
158 | ||
159 | length = -ENOMEM; | |
1872981b | 160 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 161 | if (!page) |
b77a493b EP |
162 | goto out; |
163 | ||
1da177e4 LT |
164 | length = -EFAULT; |
165 | if (copy_from_user(page, buf, count)) | |
166 | goto out; | |
167 | ||
168 | length = -EINVAL; | |
169 | if (sscanf(page, "%d", &new_value) != 1) | |
170 | goto out; | |
171 | ||
172 | if (new_value != selinux_enforcing) { | |
173 | length = task_has_security(current, SECURITY__SETENFORCE); | |
174 | if (length) | |
175 | goto out; | |
af601e46 | 176 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
177 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
178 | new_value, selinux_enforcing, | |
581abc09 | 179 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 180 | audit_get_sessionid(current)); |
1da177e4 LT |
181 | selinux_enforcing = new_value; |
182 | if (selinux_enforcing) | |
183 | avc_ss_reset(0); | |
184 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 185 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
186 | } |
187 | length = count; | |
188 | out: | |
189 | free_page((unsigned long) page); | |
190 | return length; | |
191 | } | |
192 | #else | |
193 | #define sel_write_enforce NULL | |
194 | #endif | |
195 | ||
9c2e08c5 | 196 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
197 | .read = sel_read_enforce, |
198 | .write = sel_write_enforce, | |
57a62c23 | 199 | .llseek = generic_file_llseek, |
1da177e4 LT |
200 | }; |
201 | ||
3f12070e EP |
202 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
203 | size_t count, loff_t *ppos) | |
204 | { | |
205 | char tmpbuf[TMPBUFLEN]; | |
206 | ssize_t length; | |
496ad9aa | 207 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
208 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
209 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
210 | ||
211 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
212 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
213 | } | |
214 | ||
215 | static const struct file_operations sel_handle_unknown_ops = { | |
216 | .read = sel_read_handle_unknown, | |
57a62c23 | 217 | .llseek = generic_file_llseek, |
3f12070e EP |
218 | }; |
219 | ||
11904167 KK |
220 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
221 | { | |
222 | struct page *status = selinux_kernel_status_page(); | |
223 | ||
224 | if (!status) | |
225 | return -ENOMEM; | |
226 | ||
227 | filp->private_data = status; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
233 | size_t count, loff_t *ppos) | |
234 | { | |
235 | struct page *status = filp->private_data; | |
236 | ||
237 | BUG_ON(!status); | |
238 | ||
239 | return simple_read_from_buffer(buf, count, ppos, | |
240 | page_address(status), | |
241 | sizeof(struct selinux_kernel_status)); | |
242 | } | |
243 | ||
244 | static int sel_mmap_handle_status(struct file *filp, | |
245 | struct vm_area_struct *vma) | |
246 | { | |
247 | struct page *status = filp->private_data; | |
248 | unsigned long size = vma->vm_end - vma->vm_start; | |
249 | ||
250 | BUG_ON(!status); | |
251 | ||
252 | /* only allows one page from the head */ | |
253 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
254 | return -EIO; | |
255 | /* disallow writable mapping */ | |
256 | if (vma->vm_flags & VM_WRITE) | |
257 | return -EPERM; | |
258 | /* disallow mprotect() turns it into writable */ | |
259 | vma->vm_flags &= ~VM_MAYWRITE; | |
260 | ||
261 | return remap_pfn_range(vma, vma->vm_start, | |
262 | page_to_pfn(status), | |
263 | size, vma->vm_page_prot); | |
264 | } | |
265 | ||
266 | static const struct file_operations sel_handle_status_ops = { | |
267 | .open = sel_open_handle_status, | |
268 | .read = sel_read_handle_status, | |
269 | .mmap = sel_mmap_handle_status, | |
270 | .llseek = generic_file_llseek, | |
271 | }; | |
272 | ||
1da177e4 | 273 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 274 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
275 | size_t count, loff_t *ppos) |
276 | ||
277 | { | |
b77a493b | 278 | char *page = NULL; |
1da177e4 LT |
279 | ssize_t length; |
280 | int new_value; | |
1da177e4 | 281 | |
b77a493b | 282 | length = -ENOMEM; |
bfd51626 | 283 | if (count >= PAGE_SIZE) |
6eab04a8 | 284 | goto out; |
b77a493b EP |
285 | |
286 | /* No partial writes. */ | |
287 | length = -EINVAL; | |
288 | if (*ppos != 0) | |
289 | goto out; | |
290 | ||
291 | length = -ENOMEM; | |
1872981b | 292 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 293 | if (!page) |
b77a493b EP |
294 | goto out; |
295 | ||
1da177e4 LT |
296 | length = -EFAULT; |
297 | if (copy_from_user(page, buf, count)) | |
298 | goto out; | |
299 | ||
300 | length = -EINVAL; | |
301 | if (sscanf(page, "%d", &new_value) != 1) | |
302 | goto out; | |
303 | ||
304 | if (new_value) { | |
305 | length = selinux_disable(); | |
b77a493b | 306 | if (length) |
1da177e4 | 307 | goto out; |
af601e46 | 308 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b | 309 | "selinux=0 auid=%u ses=%u", |
581abc09 | 310 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 311 | audit_get_sessionid(current)); |
1da177e4 LT |
312 | } |
313 | ||
314 | length = count; | |
315 | out: | |
316 | free_page((unsigned long) page); | |
317 | return length; | |
318 | } | |
319 | #else | |
320 | #define sel_write_disable NULL | |
321 | #endif | |
322 | ||
9c2e08c5 | 323 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 324 | .write = sel_write_disable, |
57a62c23 | 325 | .llseek = generic_file_llseek, |
1da177e4 LT |
326 | }; |
327 | ||
328 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 329 | size_t count, loff_t *ppos) |
1da177e4 LT |
330 | { |
331 | char tmpbuf[TMPBUFLEN]; | |
332 | ssize_t length; | |
333 | ||
334 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
335 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
336 | } | |
337 | ||
9c2e08c5 | 338 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 339 | .read = sel_read_policyvers, |
57a62c23 | 340 | .llseek = generic_file_llseek, |
1da177e4 LT |
341 | }; |
342 | ||
343 | /* declaration for sel_write_load */ | |
344 | static int sel_make_bools(void); | |
e47c8fc5 | 345 | static int sel_make_classes(void); |
3bb56b25 | 346 | static int sel_make_policycap(void); |
e47c8fc5 CP |
347 | |
348 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 349 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 350 | unsigned long *ino); |
1da177e4 LT |
351 | |
352 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
353 | size_t count, loff_t *ppos) | |
354 | { | |
355 | char tmpbuf[TMPBUFLEN]; | |
356 | ssize_t length; | |
357 | ||
0719aaf5 GT |
358 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
359 | security_mls_enabled()); | |
1da177e4 LT |
360 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
361 | } | |
362 | ||
9c2e08c5 | 363 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 364 | .read = sel_read_mls, |
57a62c23 | 365 | .llseek = generic_file_llseek, |
1da177e4 LT |
366 | }; |
367 | ||
cee74f47 EP |
368 | struct policy_load_memory { |
369 | size_t len; | |
370 | void *data; | |
371 | }; | |
372 | ||
373 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
374 | { | |
375 | struct policy_load_memory *plm = NULL; | |
376 | int rc; | |
377 | ||
378 | BUG_ON(filp->private_data); | |
379 | ||
380 | mutex_lock(&sel_mutex); | |
381 | ||
382 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
383 | if (rc) | |
384 | goto err; | |
385 | ||
386 | rc = -EBUSY; | |
387 | if (policy_opened) | |
388 | goto err; | |
389 | ||
390 | rc = -ENOMEM; | |
391 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
392 | if (!plm) | |
393 | goto err; | |
394 | ||
395 | if (i_size_read(inode) != security_policydb_len()) { | |
396 | mutex_lock(&inode->i_mutex); | |
397 | i_size_write(inode, security_policydb_len()); | |
398 | mutex_unlock(&inode->i_mutex); | |
399 | } | |
400 | ||
401 | rc = security_read_policy(&plm->data, &plm->len); | |
402 | if (rc) | |
403 | goto err; | |
404 | ||
405 | policy_opened = 1; | |
406 | ||
407 | filp->private_data = plm; | |
408 | ||
409 | mutex_unlock(&sel_mutex); | |
410 | ||
411 | return 0; | |
412 | err: | |
413 | mutex_unlock(&sel_mutex); | |
414 | ||
415 | if (plm) | |
416 | vfree(plm->data); | |
417 | kfree(plm); | |
418 | return rc; | |
419 | } | |
420 | ||
421 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
422 | { | |
423 | struct policy_load_memory *plm = filp->private_data; | |
424 | ||
425 | BUG_ON(!plm); | |
426 | ||
427 | policy_opened = 0; | |
428 | ||
429 | vfree(plm->data); | |
430 | kfree(plm); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
436 | size_t count, loff_t *ppos) | |
437 | { | |
438 | struct policy_load_memory *plm = filp->private_data; | |
439 | int ret; | |
440 | ||
441 | mutex_lock(&sel_mutex); | |
442 | ||
443 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
444 | if (ret) | |
445 | goto out; | |
446 | ||
447 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
448 | out: | |
449 | mutex_unlock(&sel_mutex); | |
450 | return ret; | |
451 | } | |
452 | ||
845ca30f EP |
453 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
454 | struct vm_fault *vmf) | |
455 | { | |
456 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
457 | unsigned long offset; | |
458 | struct page *page; | |
459 | ||
460 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
461 | return VM_FAULT_SIGBUS; | |
462 | ||
463 | offset = vmf->pgoff << PAGE_SHIFT; | |
464 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
465 | return VM_FAULT_SIGBUS; | |
466 | ||
467 | page = vmalloc_to_page(plm->data + offset); | |
468 | get_page(page); | |
469 | ||
470 | vmf->page = page; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | static struct vm_operations_struct sel_mmap_policy_ops = { | |
476 | .fault = sel_mmap_policy_fault, | |
477 | .page_mkwrite = sel_mmap_policy_fault, | |
478 | }; | |
479 | ||
ad3fa08c | 480 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
481 | { |
482 | if (vma->vm_flags & VM_SHARED) { | |
483 | /* do not allow mprotect to make mapping writable */ | |
484 | vma->vm_flags &= ~VM_MAYWRITE; | |
485 | ||
486 | if (vma->vm_flags & VM_WRITE) | |
487 | return -EACCES; | |
488 | } | |
489 | ||
314e51b9 | 490 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
491 | vma->vm_ops = &sel_mmap_policy_ops; |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
cee74f47 EP |
496 | static const struct file_operations sel_policy_ops = { |
497 | .open = sel_open_policy, | |
498 | .read = sel_read_policy, | |
845ca30f | 499 | .mmap = sel_mmap_policy, |
cee74f47 | 500 | .release = sel_release_policy, |
47a93a5b | 501 | .llseek = generic_file_llseek, |
cee74f47 EP |
502 | }; |
503 | ||
1872981b | 504 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
505 | size_t count, loff_t *ppos) |
506 | ||
507 | { | |
1da177e4 LT |
508 | ssize_t length; |
509 | void *data = NULL; | |
510 | ||
bb003079 | 511 | mutex_lock(&sel_mutex); |
1da177e4 LT |
512 | |
513 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
514 | if (length) | |
515 | goto out; | |
516 | ||
b77a493b EP |
517 | /* No partial writes. */ |
518 | length = -EINVAL; | |
519 | if (*ppos != 0) | |
1da177e4 | 520 | goto out; |
1da177e4 | 521 | |
b77a493b EP |
522 | length = -EFBIG; |
523 | if (count > 64 * 1024 * 1024) | |
524 | goto out; | |
525 | ||
526 | length = -ENOMEM; | |
527 | data = vmalloc(count); | |
528 | if (!data) | |
1da177e4 | 529 | goto out; |
1da177e4 LT |
530 | |
531 | length = -EFAULT; | |
532 | if (copy_from_user(data, buf, count) != 0) | |
533 | goto out; | |
534 | ||
535 | length = security_load_policy(data, count); | |
536 | if (length) | |
537 | goto out; | |
538 | ||
b77a493b EP |
539 | length = sel_make_bools(); |
540 | if (length) | |
e47c8fc5 | 541 | goto out1; |
e47c8fc5 | 542 | |
b77a493b EP |
543 | length = sel_make_classes(); |
544 | if (length) | |
3bb56b25 | 545 | goto out1; |
3bb56b25 | 546 | |
b77a493b EP |
547 | length = sel_make_policycap(); |
548 | if (length) | |
549 | goto out1; | |
550 | ||
551 | length = count; | |
e47c8fc5 CP |
552 | |
553 | out1: | |
af601e46 | 554 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 555 | "policy loaded auid=%u ses=%u", |
581abc09 | 556 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 557 | audit_get_sessionid(current)); |
1da177e4 | 558 | out: |
bb003079 | 559 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
560 | vfree(data); |
561 | return length; | |
562 | } | |
563 | ||
9c2e08c5 | 564 | static const struct file_operations sel_load_ops = { |
1da177e4 | 565 | .write = sel_write_load, |
57a62c23 | 566 | .llseek = generic_file_llseek, |
1da177e4 LT |
567 | }; |
568 | ||
1872981b | 569 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 570 | { |
b77a493b | 571 | char *canon = NULL; |
ce9982d0 | 572 | u32 sid, len; |
1da177e4 LT |
573 | ssize_t length; |
574 | ||
575 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
576 | if (length) | |
b77a493b | 577 | goto out; |
1da177e4 | 578 | |
ce9982d0 | 579 | length = security_context_to_sid(buf, size, &sid); |
b77a493b EP |
580 | if (length) |
581 | goto out; | |
1da177e4 | 582 | |
ce9982d0 | 583 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
584 | if (length) |
585 | goto out; | |
ce9982d0 | 586 | |
b77a493b | 587 | length = -ERANGE; |
ce9982d0 | 588 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
589 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
590 | "payload max\n", __func__, len); | |
1da177e4 | 591 | goto out; |
ce9982d0 | 592 | } |
1da177e4 | 593 | |
ce9982d0 SS |
594 | memcpy(buf, canon, len); |
595 | length = len; | |
1da177e4 | 596 | out: |
ce9982d0 | 597 | kfree(canon); |
1da177e4 LT |
598 | return length; |
599 | } | |
600 | ||
1da177e4 LT |
601 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
602 | size_t count, loff_t *ppos) | |
603 | { | |
604 | char tmpbuf[TMPBUFLEN]; | |
605 | ssize_t length; | |
606 | ||
607 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
608 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
609 | } | |
610 | ||
1872981b | 611 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
612 | size_t count, loff_t *ppos) |
613 | { | |
b77a493b | 614 | char *page = NULL; |
1da177e4 LT |
615 | ssize_t length; |
616 | unsigned int new_value; | |
617 | ||
618 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
619 | if (length) | |
b77a493b | 620 | goto out; |
1da177e4 | 621 | |
b77a493b | 622 | length = -ENOMEM; |
bfd51626 | 623 | if (count >= PAGE_SIZE) |
b77a493b EP |
624 | goto out; |
625 | ||
626 | /* No partial writes. */ | |
627 | length = -EINVAL; | |
628 | if (*ppos != 0) | |
629 | goto out; | |
630 | ||
631 | length = -ENOMEM; | |
1872981b | 632 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 633 | if (!page) |
b77a493b EP |
634 | goto out; |
635 | ||
1da177e4 LT |
636 | length = -EFAULT; |
637 | if (copy_from_user(page, buf, count)) | |
638 | goto out; | |
639 | ||
640 | length = -EINVAL; | |
641 | if (sscanf(page, "%u", &new_value) != 1) | |
642 | goto out; | |
643 | ||
644 | selinux_checkreqprot = new_value ? 1 : 0; | |
645 | length = count; | |
646 | out: | |
647 | free_page((unsigned long) page); | |
648 | return length; | |
649 | } | |
9c2e08c5 | 650 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
651 | .read = sel_read_checkreqprot, |
652 | .write = sel_write_checkreqprot, | |
57a62c23 | 653 | .llseek = generic_file_llseek, |
1da177e4 LT |
654 | }; |
655 | ||
656 | /* | |
657 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
658 | */ | |
1872981b EP |
659 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
660 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
661 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
662 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
663 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
664 | |
665 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
666 | [SEL_ACCESS] = sel_write_access, | |
667 | [SEL_CREATE] = sel_write_create, | |
668 | [SEL_RELABEL] = sel_write_relabel, | |
669 | [SEL_USER] = sel_write_user, | |
670 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 671 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
672 | }; |
673 | ||
674 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
675 | { | |
496ad9aa | 676 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
677 | char *data; |
678 | ssize_t rv; | |
679 | ||
6e20a64a | 680 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
681 | return -EINVAL; |
682 | ||
683 | data = simple_transaction_get(file, buf, size); | |
684 | if (IS_ERR(data)) | |
685 | return PTR_ERR(data); | |
686 | ||
1872981b EP |
687 | rv = write_op[ino](file, data, size); |
688 | if (rv > 0) { | |
1da177e4 LT |
689 | simple_transaction_set(file, rv); |
690 | rv = size; | |
691 | } | |
692 | return rv; | |
693 | } | |
694 | ||
9c2e08c5 | 695 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
696 | .write = selinux_transaction_write, |
697 | .read = simple_transaction_read, | |
698 | .release = simple_transaction_release, | |
57a62c23 | 699 | .llseek = generic_file_llseek, |
1da177e4 LT |
700 | }; |
701 | ||
702 | /* | |
703 | * payload - write methods | |
704 | * If the method has a response, the response should be put in buf, | |
705 | * and the length returned. Otherwise return 0 or and -error. | |
706 | */ | |
707 | ||
1872981b | 708 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 709 | { |
b77a493b | 710 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
711 | u32 ssid, tsid; |
712 | u16 tclass; | |
1da177e4 LT |
713 | struct av_decision avd; |
714 | ssize_t length; | |
715 | ||
716 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
717 | if (length) | |
b77a493b | 718 | goto out; |
1da177e4 LT |
719 | |
720 | length = -ENOMEM; | |
c1a7368a | 721 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 722 | if (!scon) |
b77a493b | 723 | goto out; |
1da177e4 | 724 | |
b77a493b | 725 | length = -ENOMEM; |
c1a7368a | 726 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
727 | if (!tcon) |
728 | goto out; | |
1da177e4 LT |
729 | |
730 | length = -EINVAL; | |
19439d05 | 731 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 732 | goto out; |
1da177e4 | 733 | |
c1a7368a | 734 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
735 | if (length) |
736 | goto out; | |
737 | ||
c1a7368a | 738 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
739 | if (length) |
740 | goto out; | |
1da177e4 | 741 | |
19439d05 | 742 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
743 | |
744 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 745 | "%x %x %x %x %u %x", |
f1c6381a | 746 | avd.allowed, 0xffffffff, |
1da177e4 | 747 | avd.auditallow, avd.auditdeny, |
8a6f83af | 748 | avd.seqno, avd.flags); |
1da177e4 | 749 | out: |
b77a493b | 750 | kfree(tcon); |
1da177e4 LT |
751 | kfree(scon); |
752 | return length; | |
753 | } | |
754 | ||
1872981b | 755 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 756 | { |
b77a493b | 757 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 758 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
759 | u32 ssid, tsid, newsid; |
760 | u16 tclass; | |
761 | ssize_t length; | |
b77a493b | 762 | char *newcon = NULL; |
1da177e4 | 763 | u32 len; |
f50a3ec9 | 764 | int nargs; |
1da177e4 LT |
765 | |
766 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
767 | if (length) | |
b77a493b | 768 | goto out; |
1da177e4 LT |
769 | |
770 | length = -ENOMEM; | |
c1a7368a | 771 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 772 | if (!scon) |
b77a493b | 773 | goto out; |
1da177e4 | 774 | |
b77a493b | 775 | length = -ENOMEM; |
c1a7368a | 776 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
777 | if (!tcon) |
778 | goto out; | |
1da177e4 | 779 | |
f50a3ec9 KK |
780 | length = -ENOMEM; |
781 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
782 | if (!namebuf) | |
783 | goto out; | |
784 | ||
1da177e4 | 785 | length = -EINVAL; |
f50a3ec9 KK |
786 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
787 | if (nargs < 3 || nargs > 4) | |
b77a493b | 788 | goto out; |
0f7e4c33 KK |
789 | if (nargs == 4) { |
790 | /* | |
791 | * If and when the name of new object to be queried contains | |
792 | * either whitespace or multibyte characters, they shall be | |
793 | * encoded based on the percentage-encoding rule. | |
794 | * If not encoded, the sscanf logic picks up only left-half | |
795 | * of the supplied name; splitted by a whitespace unexpectedly. | |
796 | */ | |
797 | char *r, *w; | |
798 | int c1, c2; | |
799 | ||
800 | r = w = namebuf; | |
801 | do { | |
802 | c1 = *r++; | |
803 | if (c1 == '+') | |
804 | c1 = ' '; | |
805 | else if (c1 == '%') { | |
af7ff2c2 AS |
806 | c1 = hex_to_bin(*r++); |
807 | if (c1 < 0) | |
0f7e4c33 | 808 | goto out; |
af7ff2c2 AS |
809 | c2 = hex_to_bin(*r++); |
810 | if (c2 < 0) | |
0f7e4c33 KK |
811 | goto out; |
812 | c1 = (c1 << 4) | c2; | |
813 | } | |
814 | *w++ = c1; | |
815 | } while (c1 != '\0'); | |
816 | ||
f50a3ec9 | 817 | objname = namebuf; |
0f7e4c33 | 818 | } |
1da177e4 | 819 | |
c1a7368a | 820 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
821 | if (length) |
822 | goto out; | |
823 | ||
c1a7368a | 824 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
825 | if (length) |
826 | goto out; | |
1da177e4 | 827 | |
f50a3ec9 KK |
828 | length = security_transition_sid_user(ssid, tsid, tclass, |
829 | objname, &newsid); | |
b77a493b EP |
830 | if (length) |
831 | goto out; | |
1da177e4 LT |
832 | |
833 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
834 | if (length) |
835 | goto out; | |
1da177e4 | 836 | |
b77a493b | 837 | length = -ERANGE; |
1da177e4 | 838 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
839 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
840 | "payload max\n", __func__, len); | |
b77a493b | 841 | goto out; |
1da177e4 LT |
842 | } |
843 | ||
844 | memcpy(buf, newcon, len); | |
845 | length = len; | |
b77a493b | 846 | out: |
1da177e4 | 847 | kfree(newcon); |
f50a3ec9 | 848 | kfree(namebuf); |
1da177e4 | 849 | kfree(tcon); |
1da177e4 LT |
850 | kfree(scon); |
851 | return length; | |
852 | } | |
853 | ||
1872981b | 854 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 855 | { |
b77a493b | 856 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
857 | u32 ssid, tsid, newsid; |
858 | u16 tclass; | |
859 | ssize_t length; | |
b77a493b | 860 | char *newcon = NULL; |
1da177e4 LT |
861 | u32 len; |
862 | ||
863 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
864 | if (length) | |
b77a493b | 865 | goto out; |
1da177e4 LT |
866 | |
867 | length = -ENOMEM; | |
c1a7368a | 868 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 869 | if (!scon) |
b77a493b | 870 | goto out; |
1da177e4 | 871 | |
b77a493b | 872 | length = -ENOMEM; |
c1a7368a | 873 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
874 | if (!tcon) |
875 | goto out; | |
1da177e4 LT |
876 | |
877 | length = -EINVAL; | |
878 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 879 | goto out; |
1da177e4 | 880 | |
c1a7368a | 881 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
882 | if (length) |
883 | goto out; | |
884 | ||
c1a7368a | 885 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
886 | if (length) |
887 | goto out; | |
1da177e4 LT |
888 | |
889 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
890 | if (length) |
891 | goto out; | |
1da177e4 LT |
892 | |
893 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
894 | if (length) |
895 | goto out; | |
1da177e4 | 896 | |
b77a493b EP |
897 | length = -ERANGE; |
898 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
899 | goto out; | |
1da177e4 LT |
900 | |
901 | memcpy(buf, newcon, len); | |
902 | length = len; | |
b77a493b | 903 | out: |
1da177e4 | 904 | kfree(newcon); |
1da177e4 | 905 | kfree(tcon); |
1da177e4 LT |
906 | kfree(scon); |
907 | return length; | |
908 | } | |
909 | ||
1872981b | 910 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 911 | { |
b77a493b EP |
912 | char *con = NULL, *user = NULL, *ptr; |
913 | u32 sid, *sids = NULL; | |
1da177e4 LT |
914 | ssize_t length; |
915 | char *newcon; | |
916 | int i, rc; | |
917 | u32 len, nsids; | |
918 | ||
919 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
920 | if (length) | |
6eab04a8 | 921 | goto out; |
1da177e4 LT |
922 | |
923 | length = -ENOMEM; | |
c1a7368a | 924 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 925 | if (!con) |
6eab04a8 | 926 | goto out; |
1da177e4 | 927 | |
b77a493b | 928 | length = -ENOMEM; |
c1a7368a | 929 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
930 | if (!user) |
931 | goto out; | |
1da177e4 LT |
932 | |
933 | length = -EINVAL; | |
934 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 935 | goto out; |
1da177e4 | 936 | |
c1a7368a | 937 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
b77a493b EP |
938 | if (length) |
939 | goto out; | |
1da177e4 LT |
940 | |
941 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
942 | if (length) |
943 | goto out; | |
1da177e4 LT |
944 | |
945 | length = sprintf(buf, "%u", nsids) + 1; | |
946 | ptr = buf + length; | |
947 | for (i = 0; i < nsids; i++) { | |
948 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
949 | if (rc) { | |
950 | length = rc; | |
b77a493b | 951 | goto out; |
1da177e4 LT |
952 | } |
953 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
954 | kfree(newcon); | |
955 | length = -ERANGE; | |
b77a493b | 956 | goto out; |
1da177e4 LT |
957 | } |
958 | memcpy(ptr, newcon, len); | |
959 | kfree(newcon); | |
960 | ptr += len; | |
961 | length += len; | |
962 | } | |
b77a493b | 963 | out: |
1da177e4 | 964 | kfree(sids); |
1da177e4 | 965 | kfree(user); |
1da177e4 LT |
966 | kfree(con); |
967 | return length; | |
968 | } | |
969 | ||
1872981b | 970 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 971 | { |
b77a493b | 972 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
973 | u32 ssid, tsid, newsid; |
974 | u16 tclass; | |
975 | ssize_t length; | |
b77a493b | 976 | char *newcon = NULL; |
1da177e4 LT |
977 | u32 len; |
978 | ||
979 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
980 | if (length) | |
b77a493b | 981 | goto out; |
1da177e4 LT |
982 | |
983 | length = -ENOMEM; | |
c1a7368a | 984 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 985 | if (!scon) |
6eab04a8 | 986 | goto out; |
1da177e4 | 987 | |
b77a493b | 988 | length = -ENOMEM; |
c1a7368a | 989 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
990 | if (!tcon) |
991 | goto out; | |
1da177e4 LT |
992 | |
993 | length = -EINVAL; | |
994 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 995 | goto out; |
1da177e4 | 996 | |
c1a7368a | 997 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
998 | if (length) |
999 | goto out; | |
1000 | ||
c1a7368a | 1001 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
1002 | if (length) |
1003 | goto out; | |
1da177e4 LT |
1004 | |
1005 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1006 | if (length) |
1007 | goto out; | |
1da177e4 LT |
1008 | |
1009 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1010 | if (length) |
1011 | goto out; | |
1da177e4 | 1012 | |
b77a493b | 1013 | length = -ERANGE; |
1da177e4 | 1014 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1015 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1016 | "payload max\n", __func__, len); | |
b77a493b | 1017 | goto out; |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | memcpy(buf, newcon, len); | |
1021 | length = len; | |
b77a493b | 1022 | out: |
1da177e4 | 1023 | kfree(newcon); |
1da177e4 | 1024 | kfree(tcon); |
1da177e4 LT |
1025 | kfree(scon); |
1026 | return length; | |
1027 | } | |
1028 | ||
1029 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1030 | { | |
1031 | struct inode *ret = new_inode(sb); | |
1032 | ||
1033 | if (ret) { | |
1034 | ret->i_mode = mode; | |
1da177e4 LT |
1035 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1036 | } | |
1037 | return ret; | |
1038 | } | |
1039 | ||
1da177e4 LT |
1040 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1041 | size_t count, loff_t *ppos) | |
1042 | { | |
1043 | char *page = NULL; | |
1044 | ssize_t length; | |
1da177e4 LT |
1045 | ssize_t ret; |
1046 | int cur_enforcing; | |
496ad9aa | 1047 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1048 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1049 | |
bb003079 | 1050 | mutex_lock(&sel_mutex); |
1da177e4 | 1051 | |
b77a493b EP |
1052 | ret = -EINVAL; |
1053 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1054 | goto out; |
1da177e4 | 1055 | |
b77a493b | 1056 | ret = -ENOMEM; |
1872981b | 1057 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1058 | if (!page) |
1da177e4 | 1059 | goto out; |
1da177e4 | 1060 | |
d313f948 | 1061 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1062 | if (cur_enforcing < 0) { |
1063 | ret = cur_enforcing; | |
1064 | goto out; | |
1065 | } | |
1da177e4 | 1066 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1067 | bool_pending_values[index]); |
68bdcf28 | 1068 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1069 | out: |
bb003079 | 1070 | mutex_unlock(&sel_mutex); |
b77a493b | 1071 | free_page((unsigned long)page); |
1da177e4 LT |
1072 | return ret; |
1073 | } | |
1074 | ||
1075 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1076 | size_t count, loff_t *ppos) | |
1077 | { | |
1078 | char *page = NULL; | |
d313f948 | 1079 | ssize_t length; |
1da177e4 | 1080 | int new_value; |
496ad9aa | 1081 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1082 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1083 | |
bb003079 | 1084 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1085 | |
1086 | length = task_has_security(current, SECURITY__SETBOOL); | |
1087 | if (length) | |
1088 | goto out; | |
1089 | ||
b77a493b EP |
1090 | length = -EINVAL; |
1091 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1092 | goto out; |
d313f948 | 1093 | |
b77a493b EP |
1094 | length = -ENOMEM; |
1095 | if (count >= PAGE_SIZE) | |
1da177e4 | 1096 | goto out; |
d313f948 | 1097 | |
b77a493b EP |
1098 | /* No partial writes. */ |
1099 | length = -EINVAL; | |
1100 | if (*ppos != 0) | |
1da177e4 | 1101 | goto out; |
b77a493b EP |
1102 | |
1103 | length = -ENOMEM; | |
1872981b | 1104 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1105 | if (!page) |
1da177e4 | 1106 | goto out; |
1da177e4 | 1107 | |
d313f948 | 1108 | length = -EFAULT; |
1da177e4 LT |
1109 | if (copy_from_user(page, buf, count)) |
1110 | goto out; | |
1111 | ||
1112 | length = -EINVAL; | |
1113 | if (sscanf(page, "%d", &new_value) != 1) | |
1114 | goto out; | |
1115 | ||
1116 | if (new_value) | |
1117 | new_value = 1; | |
1118 | ||
d313f948 | 1119 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1120 | length = count; |
1121 | ||
1122 | out: | |
bb003079 | 1123 | mutex_unlock(&sel_mutex); |
b77a493b | 1124 | free_page((unsigned long) page); |
1da177e4 LT |
1125 | return length; |
1126 | } | |
1127 | ||
9c2e08c5 | 1128 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1129 | .read = sel_read_bool, |
1130 | .write = sel_write_bool, | |
57a62c23 | 1131 | .llseek = generic_file_llseek, |
1da177e4 LT |
1132 | }; |
1133 | ||
1134 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1135 | const char __user *buf, | |
1136 | size_t count, loff_t *ppos) | |
1137 | { | |
1138 | char *page = NULL; | |
d313f948 | 1139 | ssize_t length; |
1da177e4 LT |
1140 | int new_value; |
1141 | ||
bb003079 | 1142 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1143 | |
1144 | length = task_has_security(current, SECURITY__SETBOOL); | |
1145 | if (length) | |
1146 | goto out; | |
1147 | ||
b77a493b EP |
1148 | length = -ENOMEM; |
1149 | if (count >= PAGE_SIZE) | |
1da177e4 | 1150 | goto out; |
b77a493b EP |
1151 | |
1152 | /* No partial writes. */ | |
1153 | length = -EINVAL; | |
1154 | if (*ppos != 0) | |
1da177e4 | 1155 | goto out; |
b77a493b EP |
1156 | |
1157 | length = -ENOMEM; | |
1872981b | 1158 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1159 | if (!page) |
1da177e4 | 1160 | goto out; |
1da177e4 | 1161 | |
d313f948 | 1162 | length = -EFAULT; |
1da177e4 LT |
1163 | if (copy_from_user(page, buf, count)) |
1164 | goto out; | |
1165 | ||
1166 | length = -EINVAL; | |
1167 | if (sscanf(page, "%d", &new_value) != 1) | |
1168 | goto out; | |
1169 | ||
b77a493b | 1170 | length = 0; |
1872981b | 1171 | if (new_value && bool_pending_values) |
b77a493b | 1172 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1173 | |
b77a493b EP |
1174 | if (!length) |
1175 | length = count; | |
1da177e4 LT |
1176 | |
1177 | out: | |
bb003079 | 1178 | mutex_unlock(&sel_mutex); |
b77a493b | 1179 | free_page((unsigned long) page); |
1da177e4 LT |
1180 | return length; |
1181 | } | |
1182 | ||
9c2e08c5 | 1183 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1184 | .write = sel_commit_bools_write, |
57a62c23 | 1185 | .llseek = generic_file_llseek, |
1da177e4 LT |
1186 | }; |
1187 | ||
0c92d7c7 | 1188 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1189 | { |
0955dc03 | 1190 | struct list_head *node; |
1da177e4 | 1191 | |
2fd6b7f5 | 1192 | spin_lock(&de->d_lock); |
1da177e4 LT |
1193 | node = de->d_subdirs.next; |
1194 | while (node != &de->d_subdirs) { | |
5160ee6f | 1195 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1196 | |
1197 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1198 | list_del_init(node); |
1199 | ||
1200 | if (d->d_inode) { | |
dc0474be | 1201 | dget_dlock(d); |
2fd6b7f5 NP |
1202 | spin_unlock(&de->d_lock); |
1203 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1204 | d_delete(d); |
1205 | simple_unlink(de->d_inode, d); | |
1206 | dput(d); | |
2fd6b7f5 NP |
1207 | spin_lock(&de->d_lock); |
1208 | } else | |
1209 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1210 | node = de->d_subdirs.next; |
1211 | } | |
1212 | ||
2fd6b7f5 | 1213 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1214 | } |
1215 | ||
1216 | #define BOOL_DIR_NAME "booleans" | |
1217 | ||
1218 | static int sel_make_bools(void) | |
1219 | { | |
b77a493b | 1220 | int i, ret; |
1da177e4 LT |
1221 | ssize_t len; |
1222 | struct dentry *dentry = NULL; | |
1223 | struct dentry *dir = bool_dir; | |
1224 | struct inode *inode = NULL; | |
1225 | struct inode_security_struct *isec; | |
1226 | char **names = NULL, *page; | |
1227 | int num; | |
1228 | int *values = NULL; | |
1229 | u32 sid; | |
1230 | ||
1231 | /* remove any existing files */ | |
8007f102 XF |
1232 | for (i = 0; i < bool_num; i++) |
1233 | kfree(bool_pending_names[i]); | |
d313f948 | 1234 | kfree(bool_pending_names); |
9a5f04bf | 1235 | kfree(bool_pending_values); |
154c50ca | 1236 | bool_num = 0; |
d313f948 | 1237 | bool_pending_names = NULL; |
20c19e41 | 1238 | bool_pending_values = NULL; |
1da177e4 | 1239 | |
0c92d7c7 | 1240 | sel_remove_entries(dir); |
1da177e4 | 1241 | |
b77a493b | 1242 | ret = -ENOMEM; |
1872981b EP |
1243 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1244 | if (!page) | |
b77a493b | 1245 | goto out; |
1da177e4 LT |
1246 | |
1247 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1248 | if (ret) |
1da177e4 LT |
1249 | goto out; |
1250 | ||
1251 | for (i = 0; i < num; i++) { | |
b77a493b | 1252 | ret = -ENOMEM; |
1da177e4 | 1253 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1254 | if (!dentry) |
1255 | goto out; | |
1256 | ||
1257 | ret = -ENOMEM; | |
1da177e4 | 1258 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1259 | if (!inode) |
1260 | goto out; | |
1da177e4 | 1261 | |
b77a493b | 1262 | ret = -ENAMETOOLONG; |
cc1dad71 | 1263 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1264 | if (len >= PAGE_SIZE) |
1265 | goto out; | |
1266 | ||
1872981b EP |
1267 | isec = (struct inode_security_struct *)inode->i_security; |
1268 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1269 | if (ret) | |
b77a493b EP |
1270 | goto out; |
1271 | ||
1da177e4 LT |
1272 | isec->sid = sid; |
1273 | isec->initialized = 1; | |
1274 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1275 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1276 | d_add(dentry, inode); |
1277 | } | |
1278 | bool_num = num; | |
d313f948 | 1279 | bool_pending_names = names; |
1da177e4 | 1280 | bool_pending_values = values; |
b77a493b EP |
1281 | |
1282 | free_page((unsigned long)page); | |
1283 | return 0; | |
1da177e4 LT |
1284 | out: |
1285 | free_page((unsigned long)page); | |
b77a493b | 1286 | |
1da177e4 | 1287 | if (names) { |
9a5f04bf JJ |
1288 | for (i = 0; i < num; i++) |
1289 | kfree(names[i]); | |
1da177e4 LT |
1290 | kfree(names); |
1291 | } | |
20c19e41 | 1292 | kfree(values); |
0c92d7c7 | 1293 | sel_remove_entries(dir); |
b77a493b EP |
1294 | |
1295 | return ret; | |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | #define NULL_FILE_NAME "null" | |
1299 | ||
765927b2 | 1300 | struct path selinux_null; |
1da177e4 LT |
1301 | |
1302 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1303 | size_t count, loff_t *ppos) | |
1304 | { | |
1305 | char tmpbuf[TMPBUFLEN]; | |
1306 | ssize_t length; | |
1307 | ||
1308 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1309 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1310 | } | |
1311 | ||
1872981b EP |
1312 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1313 | const char __user *buf, | |
1da177e4 LT |
1314 | size_t count, loff_t *ppos) |
1315 | ||
1316 | { | |
b77a493b | 1317 | char *page = NULL; |
1da177e4 LT |
1318 | ssize_t ret; |
1319 | int new_value; | |
1320 | ||
b77a493b EP |
1321 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1322 | if (ret) | |
1da177e4 | 1323 | goto out; |
1da177e4 | 1324 | |
b77a493b EP |
1325 | ret = -ENOMEM; |
1326 | if (count >= PAGE_SIZE) | |
1da177e4 | 1327 | goto out; |
1da177e4 | 1328 | |
b77a493b EP |
1329 | /* No partial writes. */ |
1330 | ret = -EINVAL; | |
1331 | if (*ppos != 0) | |
1332 | goto out; | |
1333 | ||
1334 | ret = -ENOMEM; | |
1872981b | 1335 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1336 | if (!page) |
1da177e4 | 1337 | goto out; |
1da177e4 | 1338 | |
b77a493b EP |
1339 | ret = -EFAULT; |
1340 | if (copy_from_user(page, buf, count)) | |
1341 | goto out; | |
1da177e4 | 1342 | |
b77a493b EP |
1343 | ret = -EINVAL; |
1344 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1345 | goto out; |
1da177e4 | 1346 | |
b77a493b EP |
1347 | avc_cache_threshold = new_value; |
1348 | ||
1da177e4 | 1349 | ret = count; |
1da177e4 | 1350 | out: |
b77a493b | 1351 | free_page((unsigned long)page); |
1da177e4 LT |
1352 | return ret; |
1353 | } | |
1354 | ||
1355 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1356 | size_t count, loff_t *ppos) | |
1357 | { | |
1358 | char *page; | |
b77a493b | 1359 | ssize_t length; |
1da177e4 LT |
1360 | |
1361 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1362 | if (!page) |
1363 | return -ENOMEM; | |
1364 | ||
1365 | length = avc_get_hash_stats(page); | |
1366 | if (length >= 0) | |
1367 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1368 | free_page((unsigned long)page); |
b77a493b EP |
1369 | |
1370 | return length; | |
1da177e4 LT |
1371 | } |
1372 | ||
9c2e08c5 | 1373 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1374 | .read = sel_read_avc_cache_threshold, |
1375 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1376 | .llseek = generic_file_llseek, |
1da177e4 LT |
1377 | }; |
1378 | ||
9c2e08c5 | 1379 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1380 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1381 | .llseek = generic_file_llseek, |
1da177e4 LT |
1382 | }; |
1383 | ||
1384 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1385 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1386 | { | |
1387 | int cpu; | |
1388 | ||
4f4b6c1a | 1389 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1390 | if (!cpu_possible(cpu)) |
1391 | continue; | |
1392 | *idx = cpu + 1; | |
1393 | return &per_cpu(avc_cache_stats, cpu); | |
1394 | } | |
1395 | return NULL; | |
1396 | } | |
1397 | ||
1398 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1399 | { | |
1400 | loff_t n = *pos - 1; | |
1401 | ||
1402 | if (*pos == 0) | |
1403 | return SEQ_START_TOKEN; | |
1404 | ||
1405 | return sel_avc_get_stat_idx(&n); | |
1406 | } | |
1407 | ||
1408 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1409 | { | |
1410 | return sel_avc_get_stat_idx(pos); | |
1411 | } | |
1412 | ||
1413 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1414 | { | |
1415 | struct avc_cache_stats *st = v; | |
1416 | ||
1417 | if (v == SEQ_START_TOKEN) | |
1418 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1419 | "frees\n"); | |
257313b2 LT |
1420 | else { |
1421 | unsigned int lookups = st->lookups; | |
1422 | unsigned int misses = st->misses; | |
1423 | unsigned int hits = lookups - misses; | |
1424 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1425 | hits, misses, st->allocations, | |
1da177e4 | 1426 | st->reclaims, st->frees); |
257313b2 | 1427 | } |
1da177e4 LT |
1428 | return 0; |
1429 | } | |
1430 | ||
1431 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1432 | { } | |
1433 | ||
1996a109 | 1434 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1435 | .start = sel_avc_stats_seq_start, |
1436 | .next = sel_avc_stats_seq_next, | |
1437 | .show = sel_avc_stats_seq_show, | |
1438 | .stop = sel_avc_stats_seq_stop, | |
1439 | }; | |
1440 | ||
1441 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1442 | { | |
1443 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1444 | } | |
1445 | ||
9c2e08c5 | 1446 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1447 | .open = sel_open_avc_cache_stats, |
1448 | .read = seq_read, | |
1449 | .llseek = seq_lseek, | |
1450 | .release = seq_release, | |
1451 | }; | |
1452 | #endif | |
1453 | ||
1454 | static int sel_make_avc_files(struct dentry *dir) | |
1455 | { | |
b77a493b | 1456 | int i; |
1da177e4 LT |
1457 | static struct tree_descr files[] = { |
1458 | { "cache_threshold", | |
1459 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1460 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1461 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1462 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1463 | #endif | |
1464 | }; | |
1465 | ||
6e20a64a | 1466 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1467 | struct inode *inode; |
1468 | struct dentry *dentry; | |
1469 | ||
1470 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1471 | if (!dentry) |
1472 | return -ENOMEM; | |
1da177e4 LT |
1473 | |
1474 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1475 | if (!inode) |
1476 | return -ENOMEM; | |
1477 | ||
1da177e4 | 1478 | inode->i_fop = files[i].ops; |
6174eafc | 1479 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1480 | d_add(dentry, inode); |
1481 | } | |
b77a493b EP |
1482 | |
1483 | return 0; | |
1da177e4 LT |
1484 | } |
1485 | ||
1872981b | 1486 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1487 | size_t count, loff_t *ppos) |
1488 | { | |
f0ee2e46 JC |
1489 | char *con; |
1490 | u32 sid, len; | |
1491 | ssize_t ret; | |
1492 | ||
496ad9aa | 1493 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1494 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1495 | if (ret) |
f0ee2e46 JC |
1496 | return ret; |
1497 | ||
1498 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1499 | kfree(con); | |
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | static const struct file_operations sel_initcon_ops = { | |
1504 | .read = sel_read_initcon, | |
57a62c23 | 1505 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1506 | }; |
1507 | ||
1508 | static int sel_make_initcon_files(struct dentry *dir) | |
1509 | { | |
b77a493b | 1510 | int i; |
f0ee2e46 JC |
1511 | |
1512 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1513 | struct inode *inode; | |
1514 | struct dentry *dentry; | |
1515 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1516 | if (!dentry) |
1517 | return -ENOMEM; | |
f0ee2e46 JC |
1518 | |
1519 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1520 | if (!inode) |
1521 | return -ENOMEM; | |
1522 | ||
f0ee2e46 JC |
1523 | inode->i_fop = &sel_initcon_ops; |
1524 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1525 | d_add(dentry, inode); | |
1526 | } | |
b77a493b EP |
1527 | |
1528 | return 0; | |
f0ee2e46 JC |
1529 | } |
1530 | ||
e47c8fc5 CP |
1531 | static inline unsigned long sel_class_to_ino(u16 class) |
1532 | { | |
1533 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1534 | } | |
1535 | ||
1536 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1537 | { | |
92ae9e82 | 1538 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1539 | } |
1540 | ||
1541 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1542 | { | |
1543 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1544 | } | |
1545 | ||
1546 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1547 | { | |
1548 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1549 | } | |
1550 | ||
1872981b | 1551 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1552 | size_t count, loff_t *ppos) |
1553 | { | |
496ad9aa | 1554 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1555 | char res[TMPBUFLEN]; |
1556 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1557 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1558 | } |
1559 | ||
1560 | static const struct file_operations sel_class_ops = { | |
1561 | .read = sel_read_class, | |
57a62c23 | 1562 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1563 | }; |
1564 | ||
1872981b | 1565 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1566 | size_t count, loff_t *ppos) |
1567 | { | |
496ad9aa | 1568 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1569 | char res[TMPBUFLEN]; |
1570 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1571 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1572 | } |
1573 | ||
1574 | static const struct file_operations sel_perm_ops = { | |
1575 | .read = sel_read_perm, | |
57a62c23 | 1576 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1577 | }; |
1578 | ||
3bb56b25 PM |
1579 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1580 | size_t count, loff_t *ppos) | |
1581 | { | |
1582 | int value; | |
1583 | char tmpbuf[TMPBUFLEN]; | |
1584 | ssize_t length; | |
496ad9aa | 1585 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1586 | |
1587 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1588 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1589 | ||
1590 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1591 | } | |
1592 | ||
1593 | static const struct file_operations sel_policycap_ops = { | |
1594 | .read = sel_read_policycap, | |
57a62c23 | 1595 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1596 | }; |
1597 | ||
e47c8fc5 CP |
1598 | static int sel_make_perm_files(char *objclass, int classvalue, |
1599 | struct dentry *dir) | |
1600 | { | |
b77a493b | 1601 | int i, rc, nperms; |
e47c8fc5 CP |
1602 | char **perms; |
1603 | ||
1604 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1605 | if (rc) | |
b77a493b | 1606 | return rc; |
e47c8fc5 CP |
1607 | |
1608 | for (i = 0; i < nperms; i++) { | |
1609 | struct inode *inode; | |
1610 | struct dentry *dentry; | |
1611 | ||
b77a493b | 1612 | rc = -ENOMEM; |
e47c8fc5 | 1613 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1614 | if (!dentry) |
1615 | goto out; | |
e47c8fc5 | 1616 | |
b77a493b | 1617 | rc = -ENOMEM; |
e47c8fc5 | 1618 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1619 | if (!inode) |
1620 | goto out; | |
1621 | ||
e47c8fc5 CP |
1622 | inode->i_fop = &sel_perm_ops; |
1623 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1624 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1625 | d_add(dentry, inode); |
1626 | } | |
b77a493b EP |
1627 | rc = 0; |
1628 | out: | |
e47c8fc5 CP |
1629 | for (i = 0; i < nperms; i++) |
1630 | kfree(perms[i]); | |
1631 | kfree(perms); | |
e47c8fc5 CP |
1632 | return rc; |
1633 | } | |
1634 | ||
1635 | static int sel_make_class_dir_entries(char *classname, int index, | |
1636 | struct dentry *dir) | |
1637 | { | |
1638 | struct dentry *dentry = NULL; | |
1639 | struct inode *inode = NULL; | |
1640 | int rc; | |
1641 | ||
1642 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1643 | if (!dentry) |
1644 | return -ENOMEM; | |
e47c8fc5 CP |
1645 | |
1646 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1647 | if (!inode) |
1648 | return -ENOMEM; | |
e47c8fc5 CP |
1649 | |
1650 | inode->i_fop = &sel_class_ops; | |
1651 | inode->i_ino = sel_class_to_ino(index); | |
1652 | d_add(dentry, inode); | |
1653 | ||
a1c2aa1e AV |
1654 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1655 | if (IS_ERR(dentry)) | |
1656 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1657 | |
1658 | rc = sel_make_perm_files(classname, index, dentry); | |
1659 | ||
e47c8fc5 CP |
1660 | return rc; |
1661 | } | |
1662 | ||
1663 | static void sel_remove_classes(void) | |
1664 | { | |
1665 | struct list_head *class_node; | |
1666 | ||
1667 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1668 | struct dentry *class_subdir = list_entry(class_node, | |
1669 | struct dentry, d_u.d_child); | |
1670 | struct list_head *class_subdir_node; | |
1671 | ||
1672 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1673 | struct dentry *d = list_entry(class_subdir_node, | |
1674 | struct dentry, d_u.d_child); | |
1675 | ||
1676 | if (d->d_inode) | |
1677 | if (d->d_inode->i_mode & S_IFDIR) | |
1678 | sel_remove_entries(d); | |
1679 | } | |
1680 | ||
1681 | sel_remove_entries(class_subdir); | |
1682 | } | |
1683 | ||
1684 | sel_remove_entries(class_dir); | |
1685 | } | |
1686 | ||
1687 | static int sel_make_classes(void) | |
1688 | { | |
b77a493b | 1689 | int rc, nclasses, i; |
e47c8fc5 CP |
1690 | char **classes; |
1691 | ||
1692 | /* delete any existing entries */ | |
1693 | sel_remove_classes(); | |
1694 | ||
1695 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1696 | if (rc) |
1697 | return rc; | |
e47c8fc5 CP |
1698 | |
1699 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1700 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1701 | |
1702 | for (i = 0; i < nclasses; i++) { | |
1703 | struct dentry *class_name_dir; | |
1704 | ||
a1c2aa1e | 1705 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1706 | &last_class_ino); |
a1c2aa1e AV |
1707 | if (IS_ERR(class_name_dir)) { |
1708 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1709 | goto out; |
a1c2aa1e | 1710 | } |
e47c8fc5 CP |
1711 | |
1712 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1713 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1714 | class_name_dir); |
1715 | if (rc) | |
b77a493b | 1716 | goto out; |
e47c8fc5 | 1717 | } |
b77a493b EP |
1718 | rc = 0; |
1719 | out: | |
e47c8fc5 CP |
1720 | for (i = 0; i < nclasses; i++) |
1721 | kfree(classes[i]); | |
1722 | kfree(classes); | |
e47c8fc5 CP |
1723 | return rc; |
1724 | } | |
1725 | ||
3bb56b25 PM |
1726 | static int sel_make_policycap(void) |
1727 | { | |
1728 | unsigned int iter; | |
1729 | struct dentry *dentry = NULL; | |
1730 | struct inode *inode = NULL; | |
1731 | ||
1732 | sel_remove_entries(policycap_dir); | |
1733 | ||
1734 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1735 | if (iter < ARRAY_SIZE(policycap_names)) | |
1736 | dentry = d_alloc_name(policycap_dir, | |
1737 | policycap_names[iter]); | |
1738 | else | |
1739 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1740 | ||
1741 | if (dentry == NULL) | |
1742 | return -ENOMEM; | |
1743 | ||
1744 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1745 | if (inode == NULL) | |
1746 | return -ENOMEM; | |
1747 | ||
1748 | inode->i_fop = &sel_policycap_ops; | |
1749 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1750 | d_add(dentry, inode); | |
1751 | } | |
1752 | ||
1753 | return 0; | |
1754 | } | |
1755 | ||
a1c2aa1e | 1756 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1757 | unsigned long *ino) |
1da177e4 | 1758 | { |
a1c2aa1e | 1759 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1760 | struct inode *inode; |
1761 | ||
a1c2aa1e AV |
1762 | if (!dentry) |
1763 | return ERR_PTR(-ENOMEM); | |
1764 | ||
1765 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1766 | if (!inode) { | |
1767 | dput(dentry); | |
1768 | return ERR_PTR(-ENOMEM); | |
1769 | } | |
b77a493b | 1770 | |
1da177e4 LT |
1771 | inode->i_op = &simple_dir_inode_operations; |
1772 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1773 | inode->i_ino = ++(*ino); |
40e906f8 | 1774 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1775 | inc_nlink(inode); |
1da177e4 | 1776 | d_add(dentry, inode); |
edb20fb5 | 1777 | /* bump link count on parent directory, too */ |
a1c2aa1e | 1778 | inc_nlink(dir->d_inode); |
b77a493b | 1779 | |
a1c2aa1e | 1780 | return dentry; |
1da177e4 LT |
1781 | } |
1782 | ||
1872981b | 1783 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1784 | { |
1785 | int ret; | |
1786 | struct dentry *dentry; | |
a1c2aa1e | 1787 | struct inode *inode; |
1da177e4 LT |
1788 | struct inode_security_struct *isec; |
1789 | ||
1790 | static struct tree_descr selinux_files[] = { | |
1791 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1792 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1793 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1794 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1795 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1796 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1797 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1798 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1799 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1800 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1801 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1802 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1803 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1804 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1805 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1806 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1807 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
1da177e4 LT |
1808 | /* last one */ {""} |
1809 | }; | |
1810 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1811 | if (ret) | |
161ce45a | 1812 | goto err; |
1da177e4 | 1813 | |
a1c2aa1e AV |
1814 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1815 | if (IS_ERR(bool_dir)) { | |
1816 | ret = PTR_ERR(bool_dir); | |
1817 | bool_dir = NULL; | |
161ce45a | 1818 | goto err; |
a1c2aa1e | 1819 | } |
1da177e4 | 1820 | |
b77a493b | 1821 | ret = -ENOMEM; |
1da177e4 | 1822 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1823 | if (!dentry) |
161ce45a | 1824 | goto err; |
1da177e4 | 1825 | |
b77a493b | 1826 | ret = -ENOMEM; |
1da177e4 | 1827 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1828 | if (!inode) |
161ce45a | 1829 | goto err; |
b77a493b | 1830 | |
6174eafc | 1831 | inode->i_ino = ++sel_last_ino; |
1872981b | 1832 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1833 | isec->sid = SECINITSID_DEVNULL; |
1834 | isec->sclass = SECCLASS_CHR_FILE; | |
1835 | isec->initialized = 1; | |
1836 | ||
1837 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1838 | d_add(dentry, inode); | |
765927b2 | 1839 | selinux_null.dentry = dentry; |
1da177e4 | 1840 | |
a1c2aa1e AV |
1841 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1842 | if (IS_ERR(dentry)) { | |
1843 | ret = PTR_ERR(dentry); | |
161ce45a | 1844 | goto err; |
a1c2aa1e | 1845 | } |
1da177e4 LT |
1846 | |
1847 | ret = sel_make_avc_files(dentry); | |
1848 | if (ret) | |
161ce45a | 1849 | goto err; |
f0ee2e46 | 1850 | |
a1c2aa1e AV |
1851 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1852 | if (IS_ERR(dentry)) { | |
1853 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1854 | goto err; |
a1c2aa1e | 1855 | } |
f0ee2e46 JC |
1856 | |
1857 | ret = sel_make_initcon_files(dentry); | |
1858 | if (ret) | |
1859 | goto err; | |
1860 | ||
a1c2aa1e AV |
1861 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1862 | if (IS_ERR(class_dir)) { | |
1863 | ret = PTR_ERR(class_dir); | |
1864 | class_dir = NULL; | |
3bb56b25 | 1865 | goto err; |
a1c2aa1e | 1866 | } |
3bb56b25 | 1867 | |
a1c2aa1e AV |
1868 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1869 | if (IS_ERR(policycap_dir)) { | |
1870 | ret = PTR_ERR(policycap_dir); | |
1871 | policycap_dir = NULL; | |
3bb56b25 | 1872 | goto err; |
a1c2aa1e | 1873 | } |
b77a493b | 1874 | return 0; |
161ce45a | 1875 | err: |
744ba35e EP |
1876 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1877 | __func__); | |
b77a493b | 1878 | return ret; |
1da177e4 LT |
1879 | } |
1880 | ||
fc14f2fe AV |
1881 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1882 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1883 | { |
fc14f2fe | 1884 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1885 | } |
1886 | ||
1887 | static struct file_system_type sel_fs_type = { | |
1888 | .name = "selinuxfs", | |
fc14f2fe | 1889 | .mount = sel_mount, |
1da177e4 LT |
1890 | .kill_sb = kill_litter_super, |
1891 | }; | |
1892 | ||
1893 | struct vfsmount *selinuxfs_mount; | |
7a627e3b | 1894 | static struct kobject *selinuxfs_kobj; |
1da177e4 LT |
1895 | |
1896 | static int __init init_sel_fs(void) | |
1897 | { | |
1898 | int err; | |
1899 | ||
1900 | if (!selinux_enabled) | |
1901 | return 0; | |
7a627e3b GKH |
1902 | |
1903 | selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj); | |
1904 | if (!selinuxfs_kobj) | |
1905 | return -ENOMEM; | |
1906 | ||
1da177e4 | 1907 | err = register_filesystem(&sel_fs_type); |
7a627e3b GKH |
1908 | if (err) { |
1909 | kobject_put(selinuxfs_kobj); | |
b77a493b | 1910 | return err; |
7a627e3b | 1911 | } |
b77a493b | 1912 | |
765927b2 | 1913 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1914 | if (IS_ERR(selinuxfs_mount)) { |
1915 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1916 | err = PTR_ERR(selinuxfs_mount); | |
1917 | selinuxfs_mount = NULL; | |
1da177e4 | 1918 | } |
b77a493b | 1919 | |
1da177e4 LT |
1920 | return err; |
1921 | } | |
1922 | ||
1923 | __initcall(init_sel_fs); | |
1924 | ||
1925 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1926 | void exit_sel_fs(void) | |
1927 | { | |
7a627e3b | 1928 | kobject_put(selinuxfs_kobj); |
423e0ab0 | 1929 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1930 | unregister_filesystem(&sel_fs_type); |
1931 | } | |
1932 | #endif |