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 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, | |
581abc09 | 177 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 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; | |
496ad9aa | 205 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
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 | 307 | "selinux=0 auid=%u ses=%u", |
581abc09 | 308 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 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 */ | |
a1c2aa1e | 347 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 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 | ||
314e51b9 | 488 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
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 | 498 | .release = sel_release_policy, |
47a93a5b | 499 | .llseek = generic_file_llseek, |
cee74f47 EP |
500 | }; |
501 | ||
1872981b | 502 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
503 | size_t count, loff_t *ppos) |
504 | ||
505 | { | |
1da177e4 LT |
506 | ssize_t length; |
507 | void *data = NULL; | |
508 | ||
bb003079 | 509 | mutex_lock(&sel_mutex); |
1da177e4 LT |
510 | |
511 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
512 | if (length) | |
513 | goto out; | |
514 | ||
b77a493b EP |
515 | /* No partial writes. */ |
516 | length = -EINVAL; | |
517 | if (*ppos != 0) | |
1da177e4 | 518 | goto out; |
1da177e4 | 519 | |
b77a493b EP |
520 | length = -EFBIG; |
521 | if (count > 64 * 1024 * 1024) | |
522 | goto out; | |
523 | ||
524 | length = -ENOMEM; | |
525 | data = vmalloc(count); | |
526 | if (!data) | |
1da177e4 | 527 | goto out; |
1da177e4 LT |
528 | |
529 | length = -EFAULT; | |
530 | if (copy_from_user(data, buf, count) != 0) | |
531 | goto out; | |
532 | ||
533 | length = security_load_policy(data, count); | |
534 | if (length) | |
535 | goto out; | |
536 | ||
b77a493b EP |
537 | length = sel_make_bools(); |
538 | if (length) | |
e47c8fc5 | 539 | goto out1; |
e47c8fc5 | 540 | |
b77a493b EP |
541 | length = sel_make_classes(); |
542 | if (length) | |
3bb56b25 | 543 | goto out1; |
3bb56b25 | 544 | |
b77a493b EP |
545 | length = sel_make_policycap(); |
546 | if (length) | |
547 | goto out1; | |
548 | ||
549 | length = count; | |
e47c8fc5 CP |
550 | |
551 | out1: | |
af601e46 | 552 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 553 | "policy loaded auid=%u ses=%u", |
581abc09 | 554 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 555 | audit_get_sessionid(current)); |
1da177e4 | 556 | out: |
bb003079 | 557 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
558 | vfree(data); |
559 | return length; | |
560 | } | |
561 | ||
9c2e08c5 | 562 | static const struct file_operations sel_load_ops = { |
1da177e4 | 563 | .write = sel_write_load, |
57a62c23 | 564 | .llseek = generic_file_llseek, |
1da177e4 LT |
565 | }; |
566 | ||
1872981b | 567 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 568 | { |
b77a493b | 569 | char *canon = NULL; |
ce9982d0 | 570 | u32 sid, len; |
1da177e4 LT |
571 | ssize_t length; |
572 | ||
573 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
574 | if (length) | |
b77a493b | 575 | goto out; |
1da177e4 | 576 | |
ce9982d0 | 577 | length = security_context_to_sid(buf, size, &sid); |
b77a493b EP |
578 | if (length) |
579 | goto out; | |
1da177e4 | 580 | |
ce9982d0 | 581 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
582 | if (length) |
583 | goto out; | |
ce9982d0 | 584 | |
b77a493b | 585 | length = -ERANGE; |
ce9982d0 | 586 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
587 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
588 | "payload max\n", __func__, len); | |
1da177e4 | 589 | goto out; |
ce9982d0 | 590 | } |
1da177e4 | 591 | |
ce9982d0 SS |
592 | memcpy(buf, canon, len); |
593 | length = len; | |
1da177e4 | 594 | out: |
ce9982d0 | 595 | kfree(canon); |
1da177e4 LT |
596 | return length; |
597 | } | |
598 | ||
1da177e4 LT |
599 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
600 | size_t count, loff_t *ppos) | |
601 | { | |
602 | char tmpbuf[TMPBUFLEN]; | |
603 | ssize_t length; | |
604 | ||
605 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
606 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
607 | } | |
608 | ||
1872981b | 609 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
610 | size_t count, loff_t *ppos) |
611 | { | |
b77a493b | 612 | char *page = NULL; |
1da177e4 LT |
613 | ssize_t length; |
614 | unsigned int new_value; | |
615 | ||
616 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
617 | if (length) | |
b77a493b | 618 | goto out; |
1da177e4 | 619 | |
b77a493b | 620 | length = -ENOMEM; |
bfd51626 | 621 | if (count >= PAGE_SIZE) |
b77a493b EP |
622 | goto out; |
623 | ||
624 | /* No partial writes. */ | |
625 | length = -EINVAL; | |
626 | if (*ppos != 0) | |
627 | goto out; | |
628 | ||
629 | length = -ENOMEM; | |
1872981b | 630 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1da177e4 | 631 | if (!page) |
b77a493b EP |
632 | goto out; |
633 | ||
1da177e4 LT |
634 | length = -EFAULT; |
635 | if (copy_from_user(page, buf, count)) | |
636 | goto out; | |
637 | ||
638 | length = -EINVAL; | |
639 | if (sscanf(page, "%u", &new_value) != 1) | |
640 | goto out; | |
641 | ||
642 | selinux_checkreqprot = new_value ? 1 : 0; | |
643 | length = count; | |
644 | out: | |
645 | free_page((unsigned long) page); | |
646 | return length; | |
647 | } | |
9c2e08c5 | 648 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
649 | .read = sel_read_checkreqprot, |
650 | .write = sel_write_checkreqprot, | |
57a62c23 | 651 | .llseek = generic_file_llseek, |
1da177e4 LT |
652 | }; |
653 | ||
654 | /* | |
655 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
656 | */ | |
1872981b EP |
657 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
658 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
659 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
660 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
661 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
662 | |
663 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
664 | [SEL_ACCESS] = sel_write_access, | |
665 | [SEL_CREATE] = sel_write_create, | |
666 | [SEL_RELABEL] = sel_write_relabel, | |
667 | [SEL_USER] = sel_write_user, | |
668 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 669 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
670 | }; |
671 | ||
672 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
673 | { | |
496ad9aa | 674 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
675 | char *data; |
676 | ssize_t rv; | |
677 | ||
6e20a64a | 678 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
679 | return -EINVAL; |
680 | ||
681 | data = simple_transaction_get(file, buf, size); | |
682 | if (IS_ERR(data)) | |
683 | return PTR_ERR(data); | |
684 | ||
1872981b EP |
685 | rv = write_op[ino](file, data, size); |
686 | if (rv > 0) { | |
1da177e4 LT |
687 | simple_transaction_set(file, rv); |
688 | rv = size; | |
689 | } | |
690 | return rv; | |
691 | } | |
692 | ||
9c2e08c5 | 693 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
694 | .write = selinux_transaction_write, |
695 | .read = simple_transaction_read, | |
696 | .release = simple_transaction_release, | |
57a62c23 | 697 | .llseek = generic_file_llseek, |
1da177e4 LT |
698 | }; |
699 | ||
700 | /* | |
701 | * payload - write methods | |
702 | * If the method has a response, the response should be put in buf, | |
703 | * and the length returned. Otherwise return 0 or and -error. | |
704 | */ | |
705 | ||
1872981b | 706 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 707 | { |
b77a493b | 708 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
709 | u32 ssid, tsid; |
710 | u16 tclass; | |
1da177e4 LT |
711 | struct av_decision avd; |
712 | ssize_t length; | |
713 | ||
714 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
715 | if (length) | |
b77a493b | 716 | goto out; |
1da177e4 LT |
717 | |
718 | length = -ENOMEM; | |
c1a7368a | 719 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 720 | if (!scon) |
b77a493b | 721 | goto out; |
1da177e4 | 722 | |
b77a493b | 723 | length = -ENOMEM; |
c1a7368a | 724 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
725 | if (!tcon) |
726 | goto out; | |
1da177e4 LT |
727 | |
728 | length = -EINVAL; | |
19439d05 | 729 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 730 | goto out; |
1da177e4 | 731 | |
c1a7368a | 732 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
733 | if (length) |
734 | goto out; | |
735 | ||
c1a7368a | 736 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
737 | if (length) |
738 | goto out; | |
1da177e4 | 739 | |
19439d05 | 740 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
741 | |
742 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 743 | "%x %x %x %x %u %x", |
f1c6381a | 744 | avd.allowed, 0xffffffff, |
1da177e4 | 745 | avd.auditallow, avd.auditdeny, |
8a6f83af | 746 | avd.seqno, avd.flags); |
1da177e4 | 747 | out: |
b77a493b | 748 | kfree(tcon); |
1da177e4 LT |
749 | kfree(scon); |
750 | return length; | |
751 | } | |
752 | ||
1872981b | 753 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 754 | { |
b77a493b | 755 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 756 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
757 | u32 ssid, tsid, newsid; |
758 | u16 tclass; | |
759 | ssize_t length; | |
b77a493b | 760 | char *newcon = NULL; |
1da177e4 | 761 | u32 len; |
f50a3ec9 | 762 | int nargs; |
1da177e4 LT |
763 | |
764 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
765 | if (length) | |
b77a493b | 766 | goto out; |
1da177e4 LT |
767 | |
768 | length = -ENOMEM; | |
c1a7368a | 769 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 770 | if (!scon) |
b77a493b | 771 | goto out; |
1da177e4 | 772 | |
b77a493b | 773 | length = -ENOMEM; |
c1a7368a | 774 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
775 | if (!tcon) |
776 | goto out; | |
1da177e4 | 777 | |
f50a3ec9 KK |
778 | length = -ENOMEM; |
779 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
780 | if (!namebuf) | |
781 | goto out; | |
782 | ||
1da177e4 | 783 | length = -EINVAL; |
f50a3ec9 KK |
784 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
785 | if (nargs < 3 || nargs > 4) | |
b77a493b | 786 | goto out; |
0f7e4c33 KK |
787 | if (nargs == 4) { |
788 | /* | |
789 | * If and when the name of new object to be queried contains | |
790 | * either whitespace or multibyte characters, they shall be | |
791 | * encoded based on the percentage-encoding rule. | |
792 | * If not encoded, the sscanf logic picks up only left-half | |
793 | * of the supplied name; splitted by a whitespace unexpectedly. | |
794 | */ | |
795 | char *r, *w; | |
796 | int c1, c2; | |
797 | ||
798 | r = w = namebuf; | |
799 | do { | |
800 | c1 = *r++; | |
801 | if (c1 == '+') | |
802 | c1 = ' '; | |
803 | else if (c1 == '%') { | |
af7ff2c2 AS |
804 | c1 = hex_to_bin(*r++); |
805 | if (c1 < 0) | |
0f7e4c33 | 806 | goto out; |
af7ff2c2 AS |
807 | c2 = hex_to_bin(*r++); |
808 | if (c2 < 0) | |
0f7e4c33 KK |
809 | goto out; |
810 | c1 = (c1 << 4) | c2; | |
811 | } | |
812 | *w++ = c1; | |
813 | } while (c1 != '\0'); | |
814 | ||
f50a3ec9 | 815 | objname = namebuf; |
0f7e4c33 | 816 | } |
1da177e4 | 817 | |
c1a7368a | 818 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
819 | if (length) |
820 | goto out; | |
821 | ||
c1a7368a | 822 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
823 | if (length) |
824 | goto out; | |
1da177e4 | 825 | |
f50a3ec9 KK |
826 | length = security_transition_sid_user(ssid, tsid, tclass, |
827 | objname, &newsid); | |
b77a493b EP |
828 | if (length) |
829 | goto out; | |
1da177e4 LT |
830 | |
831 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
832 | if (length) |
833 | goto out; | |
1da177e4 | 834 | |
b77a493b | 835 | length = -ERANGE; |
1da177e4 | 836 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
837 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
838 | "payload max\n", __func__, len); | |
b77a493b | 839 | goto out; |
1da177e4 LT |
840 | } |
841 | ||
842 | memcpy(buf, newcon, len); | |
843 | length = len; | |
b77a493b | 844 | out: |
1da177e4 | 845 | kfree(newcon); |
f50a3ec9 | 846 | kfree(namebuf); |
1da177e4 | 847 | kfree(tcon); |
1da177e4 LT |
848 | kfree(scon); |
849 | return length; | |
850 | } | |
851 | ||
1872981b | 852 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 853 | { |
b77a493b | 854 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
855 | u32 ssid, tsid, newsid; |
856 | u16 tclass; | |
857 | ssize_t length; | |
b77a493b | 858 | char *newcon = NULL; |
1da177e4 LT |
859 | u32 len; |
860 | ||
861 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
862 | if (length) | |
b77a493b | 863 | goto out; |
1da177e4 LT |
864 | |
865 | length = -ENOMEM; | |
c1a7368a | 866 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 867 | if (!scon) |
b77a493b | 868 | goto out; |
1da177e4 | 869 | |
b77a493b | 870 | length = -ENOMEM; |
c1a7368a | 871 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
872 | if (!tcon) |
873 | goto out; | |
1da177e4 LT |
874 | |
875 | length = -EINVAL; | |
876 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 877 | goto out; |
1da177e4 | 878 | |
c1a7368a | 879 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
880 | if (length) |
881 | goto out; | |
882 | ||
c1a7368a | 883 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
884 | if (length) |
885 | goto out; | |
1da177e4 LT |
886 | |
887 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
888 | if (length) |
889 | goto out; | |
1da177e4 LT |
890 | |
891 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
892 | if (length) |
893 | goto out; | |
1da177e4 | 894 | |
b77a493b EP |
895 | length = -ERANGE; |
896 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
897 | goto out; | |
1da177e4 LT |
898 | |
899 | memcpy(buf, newcon, len); | |
900 | length = len; | |
b77a493b | 901 | out: |
1da177e4 | 902 | kfree(newcon); |
1da177e4 | 903 | kfree(tcon); |
1da177e4 LT |
904 | kfree(scon); |
905 | return length; | |
906 | } | |
907 | ||
1872981b | 908 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 909 | { |
b77a493b EP |
910 | char *con = NULL, *user = NULL, *ptr; |
911 | u32 sid, *sids = NULL; | |
1da177e4 LT |
912 | ssize_t length; |
913 | char *newcon; | |
914 | int i, rc; | |
915 | u32 len, nsids; | |
916 | ||
917 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
918 | if (length) | |
6eab04a8 | 919 | goto out; |
1da177e4 LT |
920 | |
921 | length = -ENOMEM; | |
c1a7368a | 922 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 923 | if (!con) |
6eab04a8 | 924 | goto out; |
1da177e4 | 925 | |
b77a493b | 926 | length = -ENOMEM; |
c1a7368a | 927 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
928 | if (!user) |
929 | goto out; | |
1da177e4 LT |
930 | |
931 | length = -EINVAL; | |
932 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 933 | goto out; |
1da177e4 | 934 | |
c1a7368a | 935 | length = security_context_to_sid(con, strlen(con) + 1, &sid); |
b77a493b EP |
936 | if (length) |
937 | goto out; | |
1da177e4 LT |
938 | |
939 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
940 | if (length) |
941 | goto out; | |
1da177e4 LT |
942 | |
943 | length = sprintf(buf, "%u", nsids) + 1; | |
944 | ptr = buf + length; | |
945 | for (i = 0; i < nsids; i++) { | |
946 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
947 | if (rc) { | |
948 | length = rc; | |
b77a493b | 949 | goto out; |
1da177e4 LT |
950 | } |
951 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
952 | kfree(newcon); | |
953 | length = -ERANGE; | |
b77a493b | 954 | goto out; |
1da177e4 LT |
955 | } |
956 | memcpy(ptr, newcon, len); | |
957 | kfree(newcon); | |
958 | ptr += len; | |
959 | length += len; | |
960 | } | |
b77a493b | 961 | out: |
1da177e4 | 962 | kfree(sids); |
1da177e4 | 963 | kfree(user); |
1da177e4 LT |
964 | kfree(con); |
965 | return length; | |
966 | } | |
967 | ||
1872981b | 968 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 969 | { |
b77a493b | 970 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
971 | u32 ssid, tsid, newsid; |
972 | u16 tclass; | |
973 | ssize_t length; | |
b77a493b | 974 | char *newcon = NULL; |
1da177e4 LT |
975 | u32 len; |
976 | ||
977 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
978 | if (length) | |
b77a493b | 979 | goto out; |
1da177e4 LT |
980 | |
981 | length = -ENOMEM; | |
c1a7368a | 982 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 983 | if (!scon) |
6eab04a8 | 984 | goto out; |
1da177e4 | 985 | |
b77a493b | 986 | length = -ENOMEM; |
c1a7368a | 987 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
988 | if (!tcon) |
989 | goto out; | |
1da177e4 LT |
990 | |
991 | length = -EINVAL; | |
992 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 993 | goto out; |
1da177e4 | 994 | |
c1a7368a | 995 | length = security_context_to_sid(scon, strlen(scon) + 1, &ssid); |
b77a493b EP |
996 | if (length) |
997 | goto out; | |
998 | ||
c1a7368a | 999 | length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid); |
b77a493b EP |
1000 | if (length) |
1001 | goto out; | |
1da177e4 LT |
1002 | |
1003 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1004 | if (length) |
1005 | goto out; | |
1da177e4 LT |
1006 | |
1007 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1008 | if (length) |
1009 | goto out; | |
1da177e4 | 1010 | |
b77a493b | 1011 | length = -ERANGE; |
1da177e4 | 1012 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1013 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1014 | "payload max\n", __func__, len); | |
b77a493b | 1015 | goto out; |
1da177e4 LT |
1016 | } |
1017 | ||
1018 | memcpy(buf, newcon, len); | |
1019 | length = len; | |
b77a493b | 1020 | out: |
1da177e4 | 1021 | kfree(newcon); |
1da177e4 | 1022 | kfree(tcon); |
1da177e4 LT |
1023 | kfree(scon); |
1024 | return length; | |
1025 | } | |
1026 | ||
1027 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1028 | { | |
1029 | struct inode *ret = new_inode(sb); | |
1030 | ||
1031 | if (ret) { | |
1032 | ret->i_mode = mode; | |
1da177e4 LT |
1033 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1034 | } | |
1035 | return ret; | |
1036 | } | |
1037 | ||
1da177e4 LT |
1038 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1039 | size_t count, loff_t *ppos) | |
1040 | { | |
1041 | char *page = NULL; | |
1042 | ssize_t length; | |
1da177e4 LT |
1043 | ssize_t ret; |
1044 | int cur_enforcing; | |
496ad9aa | 1045 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1046 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1047 | |
bb003079 | 1048 | mutex_lock(&sel_mutex); |
1da177e4 | 1049 | |
b77a493b EP |
1050 | ret = -EINVAL; |
1051 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1052 | goto out; |
1da177e4 | 1053 | |
b77a493b | 1054 | ret = -ENOMEM; |
1872981b | 1055 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1056 | if (!page) |
1da177e4 | 1057 | goto out; |
1da177e4 | 1058 | |
d313f948 | 1059 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1060 | if (cur_enforcing < 0) { |
1061 | ret = cur_enforcing; | |
1062 | goto out; | |
1063 | } | |
1da177e4 | 1064 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1065 | bool_pending_values[index]); |
68bdcf28 | 1066 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1067 | out: |
bb003079 | 1068 | mutex_unlock(&sel_mutex); |
b77a493b | 1069 | free_page((unsigned long)page); |
1da177e4 LT |
1070 | return ret; |
1071 | } | |
1072 | ||
1073 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1074 | size_t count, loff_t *ppos) | |
1075 | { | |
1076 | char *page = NULL; | |
d313f948 | 1077 | ssize_t length; |
1da177e4 | 1078 | int new_value; |
496ad9aa | 1079 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1080 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1081 | |
bb003079 | 1082 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1083 | |
1084 | length = task_has_security(current, SECURITY__SETBOOL); | |
1085 | if (length) | |
1086 | goto out; | |
1087 | ||
b77a493b EP |
1088 | length = -EINVAL; |
1089 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1090 | goto out; |
d313f948 | 1091 | |
b77a493b EP |
1092 | length = -ENOMEM; |
1093 | if (count >= PAGE_SIZE) | |
1da177e4 | 1094 | goto out; |
d313f948 | 1095 | |
b77a493b EP |
1096 | /* No partial writes. */ |
1097 | length = -EINVAL; | |
1098 | if (*ppos != 0) | |
1da177e4 | 1099 | goto out; |
b77a493b EP |
1100 | |
1101 | length = -ENOMEM; | |
1872981b | 1102 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1103 | if (!page) |
1da177e4 | 1104 | goto out; |
1da177e4 | 1105 | |
d313f948 | 1106 | length = -EFAULT; |
1da177e4 LT |
1107 | if (copy_from_user(page, buf, count)) |
1108 | goto out; | |
1109 | ||
1110 | length = -EINVAL; | |
1111 | if (sscanf(page, "%d", &new_value) != 1) | |
1112 | goto out; | |
1113 | ||
1114 | if (new_value) | |
1115 | new_value = 1; | |
1116 | ||
d313f948 | 1117 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1118 | length = count; |
1119 | ||
1120 | out: | |
bb003079 | 1121 | mutex_unlock(&sel_mutex); |
b77a493b | 1122 | free_page((unsigned long) page); |
1da177e4 LT |
1123 | return length; |
1124 | } | |
1125 | ||
9c2e08c5 | 1126 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1127 | .read = sel_read_bool, |
1128 | .write = sel_write_bool, | |
57a62c23 | 1129 | .llseek = generic_file_llseek, |
1da177e4 LT |
1130 | }; |
1131 | ||
1132 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1133 | const char __user *buf, | |
1134 | size_t count, loff_t *ppos) | |
1135 | { | |
1136 | char *page = NULL; | |
d313f948 | 1137 | ssize_t length; |
1da177e4 LT |
1138 | int new_value; |
1139 | ||
bb003079 | 1140 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1141 | |
1142 | length = task_has_security(current, SECURITY__SETBOOL); | |
1143 | if (length) | |
1144 | goto out; | |
1145 | ||
b77a493b EP |
1146 | length = -ENOMEM; |
1147 | if (count >= PAGE_SIZE) | |
1da177e4 | 1148 | goto out; |
b77a493b EP |
1149 | |
1150 | /* No partial writes. */ | |
1151 | length = -EINVAL; | |
1152 | if (*ppos != 0) | |
1da177e4 | 1153 | goto out; |
b77a493b EP |
1154 | |
1155 | length = -ENOMEM; | |
1872981b | 1156 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1157 | if (!page) |
1da177e4 | 1158 | goto out; |
1da177e4 | 1159 | |
d313f948 | 1160 | length = -EFAULT; |
1da177e4 LT |
1161 | if (copy_from_user(page, buf, count)) |
1162 | goto out; | |
1163 | ||
1164 | length = -EINVAL; | |
1165 | if (sscanf(page, "%d", &new_value) != 1) | |
1166 | goto out; | |
1167 | ||
b77a493b | 1168 | length = 0; |
1872981b | 1169 | if (new_value && bool_pending_values) |
b77a493b | 1170 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1171 | |
b77a493b EP |
1172 | if (!length) |
1173 | length = count; | |
1da177e4 LT |
1174 | |
1175 | out: | |
bb003079 | 1176 | mutex_unlock(&sel_mutex); |
b77a493b | 1177 | free_page((unsigned long) page); |
1da177e4 LT |
1178 | return length; |
1179 | } | |
1180 | ||
9c2e08c5 | 1181 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1182 | .write = sel_commit_bools_write, |
57a62c23 | 1183 | .llseek = generic_file_llseek, |
1da177e4 LT |
1184 | }; |
1185 | ||
0c92d7c7 | 1186 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1187 | { |
0955dc03 | 1188 | struct list_head *node; |
1da177e4 | 1189 | |
2fd6b7f5 | 1190 | spin_lock(&de->d_lock); |
1da177e4 LT |
1191 | node = de->d_subdirs.next; |
1192 | while (node != &de->d_subdirs) { | |
5160ee6f | 1193 | struct dentry *d = list_entry(node, struct dentry, d_u.d_child); |
2fd6b7f5 NP |
1194 | |
1195 | spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); | |
1da177e4 LT |
1196 | list_del_init(node); |
1197 | ||
1198 | if (d->d_inode) { | |
dc0474be | 1199 | dget_dlock(d); |
2fd6b7f5 NP |
1200 | spin_unlock(&de->d_lock); |
1201 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1202 | d_delete(d); |
1203 | simple_unlink(de->d_inode, d); | |
1204 | dput(d); | |
2fd6b7f5 NP |
1205 | spin_lock(&de->d_lock); |
1206 | } else | |
1207 | spin_unlock(&d->d_lock); | |
1da177e4 LT |
1208 | node = de->d_subdirs.next; |
1209 | } | |
1210 | ||
2fd6b7f5 | 1211 | spin_unlock(&de->d_lock); |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | #define BOOL_DIR_NAME "booleans" | |
1215 | ||
1216 | static int sel_make_bools(void) | |
1217 | { | |
b77a493b | 1218 | int i, ret; |
1da177e4 LT |
1219 | ssize_t len; |
1220 | struct dentry *dentry = NULL; | |
1221 | struct dentry *dir = bool_dir; | |
1222 | struct inode *inode = NULL; | |
1223 | struct inode_security_struct *isec; | |
1224 | char **names = NULL, *page; | |
1225 | int num; | |
1226 | int *values = NULL; | |
1227 | u32 sid; | |
1228 | ||
1229 | /* remove any existing files */ | |
8007f102 XF |
1230 | for (i = 0; i < bool_num; i++) |
1231 | kfree(bool_pending_names[i]); | |
d313f948 | 1232 | kfree(bool_pending_names); |
9a5f04bf | 1233 | kfree(bool_pending_values); |
154c50ca | 1234 | bool_num = 0; |
d313f948 | 1235 | bool_pending_names = NULL; |
20c19e41 | 1236 | bool_pending_values = NULL; |
1da177e4 | 1237 | |
0c92d7c7 | 1238 | sel_remove_entries(dir); |
1da177e4 | 1239 | |
b77a493b | 1240 | ret = -ENOMEM; |
1872981b EP |
1241 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1242 | if (!page) | |
b77a493b | 1243 | goto out; |
1da177e4 LT |
1244 | |
1245 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1246 | if (ret) |
1da177e4 LT |
1247 | goto out; |
1248 | ||
1249 | for (i = 0; i < num; i++) { | |
b77a493b | 1250 | ret = -ENOMEM; |
1da177e4 | 1251 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1252 | if (!dentry) |
1253 | goto out; | |
1254 | ||
1255 | ret = -ENOMEM; | |
1da177e4 | 1256 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1257 | if (!inode) |
1258 | goto out; | |
1da177e4 | 1259 | |
b77a493b | 1260 | ret = -ENAMETOOLONG; |
cc1dad71 | 1261 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1262 | if (len >= PAGE_SIZE) |
1263 | goto out; | |
1264 | ||
1872981b EP |
1265 | isec = (struct inode_security_struct *)inode->i_security; |
1266 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1267 | if (ret) | |
b77a493b EP |
1268 | goto out; |
1269 | ||
1da177e4 LT |
1270 | isec->sid = sid; |
1271 | isec->initialized = 1; | |
1272 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1273 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1274 | d_add(dentry, inode); |
1275 | } | |
1276 | bool_num = num; | |
d313f948 | 1277 | bool_pending_names = names; |
1da177e4 | 1278 | bool_pending_values = values; |
b77a493b EP |
1279 | |
1280 | free_page((unsigned long)page); | |
1281 | return 0; | |
1da177e4 LT |
1282 | out: |
1283 | free_page((unsigned long)page); | |
b77a493b | 1284 | |
1da177e4 | 1285 | if (names) { |
9a5f04bf JJ |
1286 | for (i = 0; i < num; i++) |
1287 | kfree(names[i]); | |
1da177e4 LT |
1288 | kfree(names); |
1289 | } | |
20c19e41 | 1290 | kfree(values); |
0c92d7c7 | 1291 | sel_remove_entries(dir); |
b77a493b EP |
1292 | |
1293 | return ret; | |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | #define NULL_FILE_NAME "null" | |
1297 | ||
765927b2 | 1298 | struct path selinux_null; |
1da177e4 LT |
1299 | |
1300 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1301 | size_t count, loff_t *ppos) | |
1302 | { | |
1303 | char tmpbuf[TMPBUFLEN]; | |
1304 | ssize_t length; | |
1305 | ||
1306 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1307 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1308 | } | |
1309 | ||
1872981b EP |
1310 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1311 | const char __user *buf, | |
1da177e4 LT |
1312 | size_t count, loff_t *ppos) |
1313 | ||
1314 | { | |
b77a493b | 1315 | char *page = NULL; |
1da177e4 LT |
1316 | ssize_t ret; |
1317 | int new_value; | |
1318 | ||
b77a493b EP |
1319 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1320 | if (ret) | |
1da177e4 | 1321 | goto out; |
1da177e4 | 1322 | |
b77a493b EP |
1323 | ret = -ENOMEM; |
1324 | if (count >= PAGE_SIZE) | |
1da177e4 | 1325 | goto out; |
1da177e4 | 1326 | |
b77a493b EP |
1327 | /* No partial writes. */ |
1328 | ret = -EINVAL; | |
1329 | if (*ppos != 0) | |
1330 | goto out; | |
1331 | ||
1332 | ret = -ENOMEM; | |
1872981b | 1333 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1334 | if (!page) |
1da177e4 | 1335 | goto out; |
1da177e4 | 1336 | |
b77a493b EP |
1337 | ret = -EFAULT; |
1338 | if (copy_from_user(page, buf, count)) | |
1339 | goto out; | |
1da177e4 | 1340 | |
b77a493b EP |
1341 | ret = -EINVAL; |
1342 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1343 | goto out; |
1da177e4 | 1344 | |
b77a493b EP |
1345 | avc_cache_threshold = new_value; |
1346 | ||
1da177e4 | 1347 | ret = count; |
1da177e4 | 1348 | out: |
b77a493b | 1349 | free_page((unsigned long)page); |
1da177e4 LT |
1350 | return ret; |
1351 | } | |
1352 | ||
1353 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1354 | size_t count, loff_t *ppos) | |
1355 | { | |
1356 | char *page; | |
b77a493b | 1357 | ssize_t length; |
1da177e4 LT |
1358 | |
1359 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1360 | if (!page) |
1361 | return -ENOMEM; | |
1362 | ||
1363 | length = avc_get_hash_stats(page); | |
1364 | if (length >= 0) | |
1365 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1366 | free_page((unsigned long)page); |
b77a493b EP |
1367 | |
1368 | return length; | |
1da177e4 LT |
1369 | } |
1370 | ||
9c2e08c5 | 1371 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1372 | .read = sel_read_avc_cache_threshold, |
1373 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1374 | .llseek = generic_file_llseek, |
1da177e4 LT |
1375 | }; |
1376 | ||
9c2e08c5 | 1377 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1378 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1379 | .llseek = generic_file_llseek, |
1da177e4 LT |
1380 | }; |
1381 | ||
1382 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1383 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1384 | { | |
1385 | int cpu; | |
1386 | ||
4f4b6c1a | 1387 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1388 | if (!cpu_possible(cpu)) |
1389 | continue; | |
1390 | *idx = cpu + 1; | |
1391 | return &per_cpu(avc_cache_stats, cpu); | |
1392 | } | |
1393 | return NULL; | |
1394 | } | |
1395 | ||
1396 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1397 | { | |
1398 | loff_t n = *pos - 1; | |
1399 | ||
1400 | if (*pos == 0) | |
1401 | return SEQ_START_TOKEN; | |
1402 | ||
1403 | return sel_avc_get_stat_idx(&n); | |
1404 | } | |
1405 | ||
1406 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1407 | { | |
1408 | return sel_avc_get_stat_idx(pos); | |
1409 | } | |
1410 | ||
1411 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1412 | { | |
1413 | struct avc_cache_stats *st = v; | |
1414 | ||
1415 | if (v == SEQ_START_TOKEN) | |
1416 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1417 | "frees\n"); | |
257313b2 LT |
1418 | else { |
1419 | unsigned int lookups = st->lookups; | |
1420 | unsigned int misses = st->misses; | |
1421 | unsigned int hits = lookups - misses; | |
1422 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1423 | hits, misses, st->allocations, | |
1da177e4 | 1424 | st->reclaims, st->frees); |
257313b2 | 1425 | } |
1da177e4 LT |
1426 | return 0; |
1427 | } | |
1428 | ||
1429 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1430 | { } | |
1431 | ||
1996a109 | 1432 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1433 | .start = sel_avc_stats_seq_start, |
1434 | .next = sel_avc_stats_seq_next, | |
1435 | .show = sel_avc_stats_seq_show, | |
1436 | .stop = sel_avc_stats_seq_stop, | |
1437 | }; | |
1438 | ||
1439 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1440 | { | |
1441 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1442 | } | |
1443 | ||
9c2e08c5 | 1444 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1445 | .open = sel_open_avc_cache_stats, |
1446 | .read = seq_read, | |
1447 | .llseek = seq_lseek, | |
1448 | .release = seq_release, | |
1449 | }; | |
1450 | #endif | |
1451 | ||
1452 | static int sel_make_avc_files(struct dentry *dir) | |
1453 | { | |
b77a493b | 1454 | int i; |
1da177e4 LT |
1455 | static struct tree_descr files[] = { |
1456 | { "cache_threshold", | |
1457 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1458 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1459 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1460 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1461 | #endif | |
1462 | }; | |
1463 | ||
6e20a64a | 1464 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1465 | struct inode *inode; |
1466 | struct dentry *dentry; | |
1467 | ||
1468 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1469 | if (!dentry) |
1470 | return -ENOMEM; | |
1da177e4 LT |
1471 | |
1472 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1473 | if (!inode) |
1474 | return -ENOMEM; | |
1475 | ||
1da177e4 | 1476 | inode->i_fop = files[i].ops; |
6174eafc | 1477 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1478 | d_add(dentry, inode); |
1479 | } | |
b77a493b EP |
1480 | |
1481 | return 0; | |
1da177e4 LT |
1482 | } |
1483 | ||
1872981b | 1484 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1485 | size_t count, loff_t *ppos) |
1486 | { | |
f0ee2e46 JC |
1487 | char *con; |
1488 | u32 sid, len; | |
1489 | ssize_t ret; | |
1490 | ||
496ad9aa | 1491 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1492 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1493 | if (ret) |
f0ee2e46 JC |
1494 | return ret; |
1495 | ||
1496 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1497 | kfree(con); | |
1498 | return ret; | |
1499 | } | |
1500 | ||
1501 | static const struct file_operations sel_initcon_ops = { | |
1502 | .read = sel_read_initcon, | |
57a62c23 | 1503 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1504 | }; |
1505 | ||
1506 | static int sel_make_initcon_files(struct dentry *dir) | |
1507 | { | |
b77a493b | 1508 | int i; |
f0ee2e46 JC |
1509 | |
1510 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1511 | struct inode *inode; | |
1512 | struct dentry *dentry; | |
1513 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1514 | if (!dentry) |
1515 | return -ENOMEM; | |
f0ee2e46 JC |
1516 | |
1517 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1518 | if (!inode) |
1519 | return -ENOMEM; | |
1520 | ||
f0ee2e46 JC |
1521 | inode->i_fop = &sel_initcon_ops; |
1522 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1523 | d_add(dentry, inode); | |
1524 | } | |
b77a493b EP |
1525 | |
1526 | return 0; | |
f0ee2e46 JC |
1527 | } |
1528 | ||
e47c8fc5 CP |
1529 | static inline unsigned long sel_class_to_ino(u16 class) |
1530 | { | |
1531 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1532 | } | |
1533 | ||
1534 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1535 | { | |
92ae9e82 | 1536 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1537 | } |
1538 | ||
1539 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1540 | { | |
1541 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1542 | } | |
1543 | ||
1544 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1545 | { | |
1546 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1547 | } | |
1548 | ||
1872981b | 1549 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1550 | size_t count, loff_t *ppos) |
1551 | { | |
496ad9aa | 1552 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1553 | char res[TMPBUFLEN]; |
1554 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1555 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1556 | } |
1557 | ||
1558 | static const struct file_operations sel_class_ops = { | |
1559 | .read = sel_read_class, | |
57a62c23 | 1560 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1561 | }; |
1562 | ||
1872981b | 1563 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1564 | size_t count, loff_t *ppos) |
1565 | { | |
496ad9aa | 1566 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1567 | char res[TMPBUFLEN]; |
1568 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1569 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1570 | } |
1571 | ||
1572 | static const struct file_operations sel_perm_ops = { | |
1573 | .read = sel_read_perm, | |
57a62c23 | 1574 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1575 | }; |
1576 | ||
3bb56b25 PM |
1577 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1578 | size_t count, loff_t *ppos) | |
1579 | { | |
1580 | int value; | |
1581 | char tmpbuf[TMPBUFLEN]; | |
1582 | ssize_t length; | |
496ad9aa | 1583 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1584 | |
1585 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1586 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1587 | ||
1588 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1589 | } | |
1590 | ||
1591 | static const struct file_operations sel_policycap_ops = { | |
1592 | .read = sel_read_policycap, | |
57a62c23 | 1593 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1594 | }; |
1595 | ||
e47c8fc5 CP |
1596 | static int sel_make_perm_files(char *objclass, int classvalue, |
1597 | struct dentry *dir) | |
1598 | { | |
b77a493b | 1599 | int i, rc, nperms; |
e47c8fc5 CP |
1600 | char **perms; |
1601 | ||
1602 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1603 | if (rc) | |
b77a493b | 1604 | return rc; |
e47c8fc5 CP |
1605 | |
1606 | for (i = 0; i < nperms; i++) { | |
1607 | struct inode *inode; | |
1608 | struct dentry *dentry; | |
1609 | ||
b77a493b | 1610 | rc = -ENOMEM; |
e47c8fc5 | 1611 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1612 | if (!dentry) |
1613 | goto out; | |
e47c8fc5 | 1614 | |
b77a493b | 1615 | rc = -ENOMEM; |
e47c8fc5 | 1616 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1617 | if (!inode) |
1618 | goto out; | |
1619 | ||
e47c8fc5 CP |
1620 | inode->i_fop = &sel_perm_ops; |
1621 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1622 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1623 | d_add(dentry, inode); |
1624 | } | |
b77a493b EP |
1625 | rc = 0; |
1626 | out: | |
e47c8fc5 CP |
1627 | for (i = 0; i < nperms; i++) |
1628 | kfree(perms[i]); | |
1629 | kfree(perms); | |
e47c8fc5 CP |
1630 | return rc; |
1631 | } | |
1632 | ||
1633 | static int sel_make_class_dir_entries(char *classname, int index, | |
1634 | struct dentry *dir) | |
1635 | { | |
1636 | struct dentry *dentry = NULL; | |
1637 | struct inode *inode = NULL; | |
1638 | int rc; | |
1639 | ||
1640 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1641 | if (!dentry) |
1642 | return -ENOMEM; | |
e47c8fc5 CP |
1643 | |
1644 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1645 | if (!inode) |
1646 | return -ENOMEM; | |
e47c8fc5 CP |
1647 | |
1648 | inode->i_fop = &sel_class_ops; | |
1649 | inode->i_ino = sel_class_to_ino(index); | |
1650 | d_add(dentry, inode); | |
1651 | ||
a1c2aa1e AV |
1652 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1653 | if (IS_ERR(dentry)) | |
1654 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1655 | |
1656 | rc = sel_make_perm_files(classname, index, dentry); | |
1657 | ||
e47c8fc5 CP |
1658 | return rc; |
1659 | } | |
1660 | ||
1661 | static void sel_remove_classes(void) | |
1662 | { | |
1663 | struct list_head *class_node; | |
1664 | ||
1665 | list_for_each(class_node, &class_dir->d_subdirs) { | |
1666 | struct dentry *class_subdir = list_entry(class_node, | |
1667 | struct dentry, d_u.d_child); | |
1668 | struct list_head *class_subdir_node; | |
1669 | ||
1670 | list_for_each(class_subdir_node, &class_subdir->d_subdirs) { | |
1671 | struct dentry *d = list_entry(class_subdir_node, | |
1672 | struct dentry, d_u.d_child); | |
1673 | ||
1674 | if (d->d_inode) | |
1675 | if (d->d_inode->i_mode & S_IFDIR) | |
1676 | sel_remove_entries(d); | |
1677 | } | |
1678 | ||
1679 | sel_remove_entries(class_subdir); | |
1680 | } | |
1681 | ||
1682 | sel_remove_entries(class_dir); | |
1683 | } | |
1684 | ||
1685 | static int sel_make_classes(void) | |
1686 | { | |
b77a493b | 1687 | int rc, nclasses, i; |
e47c8fc5 CP |
1688 | char **classes; |
1689 | ||
1690 | /* delete any existing entries */ | |
1691 | sel_remove_classes(); | |
1692 | ||
1693 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1694 | if (rc) |
1695 | return rc; | |
e47c8fc5 CP |
1696 | |
1697 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1698 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1699 | |
1700 | for (i = 0; i < nclasses; i++) { | |
1701 | struct dentry *class_name_dir; | |
1702 | ||
a1c2aa1e | 1703 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1704 | &last_class_ino); |
a1c2aa1e AV |
1705 | if (IS_ERR(class_name_dir)) { |
1706 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1707 | goto out; |
a1c2aa1e | 1708 | } |
e47c8fc5 CP |
1709 | |
1710 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1711 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1712 | class_name_dir); |
1713 | if (rc) | |
b77a493b | 1714 | goto out; |
e47c8fc5 | 1715 | } |
b77a493b EP |
1716 | rc = 0; |
1717 | out: | |
e47c8fc5 CP |
1718 | for (i = 0; i < nclasses; i++) |
1719 | kfree(classes[i]); | |
1720 | kfree(classes); | |
e47c8fc5 CP |
1721 | return rc; |
1722 | } | |
1723 | ||
3bb56b25 PM |
1724 | static int sel_make_policycap(void) |
1725 | { | |
1726 | unsigned int iter; | |
1727 | struct dentry *dentry = NULL; | |
1728 | struct inode *inode = NULL; | |
1729 | ||
1730 | sel_remove_entries(policycap_dir); | |
1731 | ||
1732 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1733 | if (iter < ARRAY_SIZE(policycap_names)) | |
1734 | dentry = d_alloc_name(policycap_dir, | |
1735 | policycap_names[iter]); | |
1736 | else | |
1737 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1738 | ||
1739 | if (dentry == NULL) | |
1740 | return -ENOMEM; | |
1741 | ||
1742 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1743 | if (inode == NULL) | |
1744 | return -ENOMEM; | |
1745 | ||
1746 | inode->i_fop = &sel_policycap_ops; | |
1747 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1748 | d_add(dentry, inode); | |
1749 | } | |
1750 | ||
1751 | return 0; | |
1752 | } | |
1753 | ||
a1c2aa1e | 1754 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1755 | unsigned long *ino) |
1da177e4 | 1756 | { |
a1c2aa1e | 1757 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1758 | struct inode *inode; |
1759 | ||
a1c2aa1e AV |
1760 | if (!dentry) |
1761 | return ERR_PTR(-ENOMEM); | |
1762 | ||
1763 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1764 | if (!inode) { | |
1765 | dput(dentry); | |
1766 | return ERR_PTR(-ENOMEM); | |
1767 | } | |
b77a493b | 1768 | |
1da177e4 LT |
1769 | inode->i_op = &simple_dir_inode_operations; |
1770 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1771 | inode->i_ino = ++(*ino); |
40e906f8 | 1772 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1773 | inc_nlink(inode); |
1da177e4 | 1774 | d_add(dentry, inode); |
edb20fb5 | 1775 | /* bump link count on parent directory, too */ |
a1c2aa1e | 1776 | inc_nlink(dir->d_inode); |
b77a493b | 1777 | |
a1c2aa1e | 1778 | return dentry; |
1da177e4 LT |
1779 | } |
1780 | ||
1872981b | 1781 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1782 | { |
1783 | int ret; | |
1784 | struct dentry *dentry; | |
a1c2aa1e | 1785 | struct inode *inode; |
1da177e4 LT |
1786 | struct inode_security_struct *isec; |
1787 | ||
1788 | static struct tree_descr selinux_files[] = { | |
1789 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1790 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1791 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1792 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1793 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1794 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1795 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1796 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1797 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1798 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1799 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1800 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1801 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1802 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1803 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1804 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1805 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
1da177e4 LT |
1806 | /* last one */ {""} |
1807 | }; | |
1808 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1809 | if (ret) | |
161ce45a | 1810 | goto err; |
1da177e4 | 1811 | |
a1c2aa1e AV |
1812 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1813 | if (IS_ERR(bool_dir)) { | |
1814 | ret = PTR_ERR(bool_dir); | |
1815 | bool_dir = NULL; | |
161ce45a | 1816 | goto err; |
a1c2aa1e | 1817 | } |
1da177e4 | 1818 | |
b77a493b | 1819 | ret = -ENOMEM; |
1da177e4 | 1820 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1821 | if (!dentry) |
161ce45a | 1822 | goto err; |
1da177e4 | 1823 | |
b77a493b | 1824 | ret = -ENOMEM; |
1da177e4 | 1825 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1826 | if (!inode) |
161ce45a | 1827 | goto err; |
b77a493b | 1828 | |
6174eafc | 1829 | inode->i_ino = ++sel_last_ino; |
1872981b | 1830 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1831 | isec->sid = SECINITSID_DEVNULL; |
1832 | isec->sclass = SECCLASS_CHR_FILE; | |
1833 | isec->initialized = 1; | |
1834 | ||
1835 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1836 | d_add(dentry, inode); | |
765927b2 | 1837 | selinux_null.dentry = dentry; |
1da177e4 | 1838 | |
a1c2aa1e AV |
1839 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1840 | if (IS_ERR(dentry)) { | |
1841 | ret = PTR_ERR(dentry); | |
161ce45a | 1842 | goto err; |
a1c2aa1e | 1843 | } |
1da177e4 LT |
1844 | |
1845 | ret = sel_make_avc_files(dentry); | |
1846 | if (ret) | |
161ce45a | 1847 | goto err; |
f0ee2e46 | 1848 | |
a1c2aa1e AV |
1849 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1850 | if (IS_ERR(dentry)) { | |
1851 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1852 | goto err; |
a1c2aa1e | 1853 | } |
f0ee2e46 JC |
1854 | |
1855 | ret = sel_make_initcon_files(dentry); | |
1856 | if (ret) | |
1857 | goto err; | |
1858 | ||
a1c2aa1e AV |
1859 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1860 | if (IS_ERR(class_dir)) { | |
1861 | ret = PTR_ERR(class_dir); | |
1862 | class_dir = NULL; | |
3bb56b25 | 1863 | goto err; |
a1c2aa1e | 1864 | } |
3bb56b25 | 1865 | |
a1c2aa1e AV |
1866 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1867 | if (IS_ERR(policycap_dir)) { | |
1868 | ret = PTR_ERR(policycap_dir); | |
1869 | policycap_dir = NULL; | |
3bb56b25 | 1870 | goto err; |
a1c2aa1e | 1871 | } |
b77a493b | 1872 | return 0; |
161ce45a | 1873 | err: |
744ba35e EP |
1874 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1875 | __func__); | |
b77a493b | 1876 | return ret; |
1da177e4 LT |
1877 | } |
1878 | ||
fc14f2fe AV |
1879 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1880 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1881 | { |
fc14f2fe | 1882 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1883 | } |
1884 | ||
1885 | static struct file_system_type sel_fs_type = { | |
1886 | .name = "selinuxfs", | |
fc14f2fe | 1887 | .mount = sel_mount, |
1da177e4 LT |
1888 | .kill_sb = kill_litter_super, |
1889 | }; | |
1890 | ||
1891 | struct vfsmount *selinuxfs_mount; | |
7a627e3b | 1892 | static struct kobject *selinuxfs_kobj; |
1da177e4 LT |
1893 | |
1894 | static int __init init_sel_fs(void) | |
1895 | { | |
1896 | int err; | |
1897 | ||
1898 | if (!selinux_enabled) | |
1899 | return 0; | |
7a627e3b GKH |
1900 | |
1901 | selinuxfs_kobj = kobject_create_and_add("selinux", fs_kobj); | |
1902 | if (!selinuxfs_kobj) | |
1903 | return -ENOMEM; | |
1904 | ||
1da177e4 | 1905 | err = register_filesystem(&sel_fs_type); |
7a627e3b GKH |
1906 | if (err) { |
1907 | kobject_put(selinuxfs_kobj); | |
b77a493b | 1908 | return err; |
7a627e3b | 1909 | } |
b77a493b | 1910 | |
765927b2 | 1911 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1912 | if (IS_ERR(selinuxfs_mount)) { |
1913 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1914 | err = PTR_ERR(selinuxfs_mount); | |
1915 | selinuxfs_mount = NULL; | |
1da177e4 | 1916 | } |
b77a493b | 1917 | |
1da177e4 LT |
1918 | return err; |
1919 | } | |
1920 | ||
1921 | __initcall(init_sel_fs); | |
1922 | ||
1923 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1924 | void exit_sel_fs(void) | |
1925 | { | |
7a627e3b | 1926 | kobject_put(selinuxfs_kobj); |
423e0ab0 | 1927 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1928 | unregister_filesystem(&sel_fs_type); |
1929 | } | |
1930 | #endif |