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 | 56 | unsigned long checkreqprot; |
29707b20 | 57 | if (!kstrtoul(str, 0, &checkreqprot)) |
f5269710 | 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 */ |
f9df6458 | 119 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 120 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
121 | }; |
122 | ||
6174eafc JC |
123 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
124 | ||
3bb56b25 PM |
125 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
126 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
127 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
128 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
129 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 130 | |
1da177e4 LT |
131 | #define TMPBUFLEN 12 |
132 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
133 | size_t count, loff_t *ppos) | |
134 | { | |
135 | char tmpbuf[TMPBUFLEN]; | |
136 | ssize_t length; | |
137 | ||
138 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
139 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
140 | } | |
141 | ||
142 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 143 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
144 | size_t count, loff_t *ppos) |
145 | ||
146 | { | |
b77a493b | 147 | char *page = NULL; |
1da177e4 LT |
148 | ssize_t length; |
149 | int new_value; | |
150 | ||
bfd51626 | 151 | if (count >= PAGE_SIZE) |
8365a719 | 152 | return -ENOMEM; |
b77a493b EP |
153 | |
154 | /* No partial writes. */ | |
b77a493b | 155 | if (*ppos != 0) |
8365a719 | 156 | return -EINVAL; |
b77a493b | 157 | |
8365a719 AV |
158 | page = memdup_user_nul(buf, count); |
159 | if (IS_ERR(page)) | |
160 | return PTR_ERR(page); | |
1da177e4 LT |
161 | |
162 | length = -EINVAL; | |
163 | if (sscanf(page, "%d", &new_value) != 1) | |
164 | goto out; | |
165 | ||
166 | if (new_value != selinux_enforcing) { | |
167 | length = task_has_security(current, SECURITY__SETENFORCE); | |
168 | if (length) | |
169 | goto out; | |
af601e46 | 170 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
171 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
172 | new_value, selinux_enforcing, | |
581abc09 | 173 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 174 | audit_get_sessionid(current)); |
1da177e4 LT |
175 | selinux_enforcing = new_value; |
176 | if (selinux_enforcing) | |
177 | avc_ss_reset(0); | |
178 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 179 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
180 | } |
181 | length = count; | |
182 | out: | |
8365a719 | 183 | kfree(page); |
1da177e4 LT |
184 | return length; |
185 | } | |
186 | #else | |
187 | #define sel_write_enforce NULL | |
188 | #endif | |
189 | ||
9c2e08c5 | 190 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
191 | .read = sel_read_enforce, |
192 | .write = sel_write_enforce, | |
57a62c23 | 193 | .llseek = generic_file_llseek, |
1da177e4 LT |
194 | }; |
195 | ||
3f12070e EP |
196 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
197 | size_t count, loff_t *ppos) | |
198 | { | |
199 | char tmpbuf[TMPBUFLEN]; | |
200 | ssize_t length; | |
496ad9aa | 201 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
202 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
203 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
204 | ||
205 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
206 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
207 | } | |
208 | ||
209 | static const struct file_operations sel_handle_unknown_ops = { | |
210 | .read = sel_read_handle_unknown, | |
57a62c23 | 211 | .llseek = generic_file_llseek, |
3f12070e EP |
212 | }; |
213 | ||
11904167 KK |
214 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
215 | { | |
216 | struct page *status = selinux_kernel_status_page(); | |
217 | ||
218 | if (!status) | |
219 | return -ENOMEM; | |
220 | ||
221 | filp->private_data = status; | |
222 | ||
223 | return 0; | |
224 | } | |
225 | ||
226 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
227 | size_t count, loff_t *ppos) | |
228 | { | |
229 | struct page *status = filp->private_data; | |
230 | ||
231 | BUG_ON(!status); | |
232 | ||
233 | return simple_read_from_buffer(buf, count, ppos, | |
234 | page_address(status), | |
235 | sizeof(struct selinux_kernel_status)); | |
236 | } | |
237 | ||
238 | static int sel_mmap_handle_status(struct file *filp, | |
239 | struct vm_area_struct *vma) | |
240 | { | |
241 | struct page *status = filp->private_data; | |
242 | unsigned long size = vma->vm_end - vma->vm_start; | |
243 | ||
244 | BUG_ON(!status); | |
245 | ||
246 | /* only allows one page from the head */ | |
247 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
248 | return -EIO; | |
249 | /* disallow writable mapping */ | |
250 | if (vma->vm_flags & VM_WRITE) | |
251 | return -EPERM; | |
252 | /* disallow mprotect() turns it into writable */ | |
253 | vma->vm_flags &= ~VM_MAYWRITE; | |
254 | ||
255 | return remap_pfn_range(vma, vma->vm_start, | |
256 | page_to_pfn(status), | |
257 | size, vma->vm_page_prot); | |
258 | } | |
259 | ||
260 | static const struct file_operations sel_handle_status_ops = { | |
261 | .open = sel_open_handle_status, | |
262 | .read = sel_read_handle_status, | |
263 | .mmap = sel_mmap_handle_status, | |
264 | .llseek = generic_file_llseek, | |
265 | }; | |
266 | ||
1da177e4 | 267 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 268 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
269 | size_t count, loff_t *ppos) |
270 | ||
271 | { | |
8365a719 | 272 | char *page; |
1da177e4 LT |
273 | ssize_t length; |
274 | int new_value; | |
1da177e4 | 275 | |
bfd51626 | 276 | if (count >= PAGE_SIZE) |
8365a719 | 277 | return -ENOMEM; |
b77a493b EP |
278 | |
279 | /* No partial writes. */ | |
b77a493b | 280 | if (*ppos != 0) |
8365a719 | 281 | return -EINVAL; |
b77a493b | 282 | |
8365a719 AV |
283 | page = memdup_user_nul(buf, count); |
284 | if (IS_ERR(page)) | |
285 | return PTR_ERR(page); | |
1da177e4 LT |
286 | |
287 | length = -EINVAL; | |
288 | if (sscanf(page, "%d", &new_value) != 1) | |
289 | goto out; | |
290 | ||
291 | if (new_value) { | |
292 | length = selinux_disable(); | |
b77a493b | 293 | if (length) |
1da177e4 | 294 | goto out; |
af601e46 | 295 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b | 296 | "selinux=0 auid=%u ses=%u", |
581abc09 | 297 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 298 | audit_get_sessionid(current)); |
1da177e4 LT |
299 | } |
300 | ||
301 | length = count; | |
302 | out: | |
8365a719 | 303 | kfree(page); |
1da177e4 LT |
304 | return length; |
305 | } | |
306 | #else | |
307 | #define sel_write_disable NULL | |
308 | #endif | |
309 | ||
9c2e08c5 | 310 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 311 | .write = sel_write_disable, |
57a62c23 | 312 | .llseek = generic_file_llseek, |
1da177e4 LT |
313 | }; |
314 | ||
315 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 316 | size_t count, loff_t *ppos) |
1da177e4 LT |
317 | { |
318 | char tmpbuf[TMPBUFLEN]; | |
319 | ssize_t length; | |
320 | ||
321 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
322 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
323 | } | |
324 | ||
9c2e08c5 | 325 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 326 | .read = sel_read_policyvers, |
57a62c23 | 327 | .llseek = generic_file_llseek, |
1da177e4 LT |
328 | }; |
329 | ||
330 | /* declaration for sel_write_load */ | |
331 | static int sel_make_bools(void); | |
e47c8fc5 | 332 | static int sel_make_classes(void); |
3bb56b25 | 333 | static int sel_make_policycap(void); |
e47c8fc5 CP |
334 | |
335 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 336 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 337 | unsigned long *ino); |
1da177e4 LT |
338 | |
339 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
340 | size_t count, loff_t *ppos) | |
341 | { | |
342 | char tmpbuf[TMPBUFLEN]; | |
343 | ssize_t length; | |
344 | ||
0719aaf5 GT |
345 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
346 | security_mls_enabled()); | |
1da177e4 LT |
347 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
348 | } | |
349 | ||
9c2e08c5 | 350 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 351 | .read = sel_read_mls, |
57a62c23 | 352 | .llseek = generic_file_llseek, |
1da177e4 LT |
353 | }; |
354 | ||
cee74f47 EP |
355 | struct policy_load_memory { |
356 | size_t len; | |
357 | void *data; | |
358 | }; | |
359 | ||
360 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
361 | { | |
362 | struct policy_load_memory *plm = NULL; | |
363 | int rc; | |
364 | ||
365 | BUG_ON(filp->private_data); | |
366 | ||
367 | mutex_lock(&sel_mutex); | |
368 | ||
369 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
370 | if (rc) | |
371 | goto err; | |
372 | ||
373 | rc = -EBUSY; | |
374 | if (policy_opened) | |
375 | goto err; | |
376 | ||
377 | rc = -ENOMEM; | |
378 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
379 | if (!plm) | |
380 | goto err; | |
381 | ||
382 | if (i_size_read(inode) != security_policydb_len()) { | |
5955102c | 383 | inode_lock(inode); |
cee74f47 | 384 | i_size_write(inode, security_policydb_len()); |
5955102c | 385 | inode_unlock(inode); |
cee74f47 EP |
386 | } |
387 | ||
388 | rc = security_read_policy(&plm->data, &plm->len); | |
389 | if (rc) | |
390 | goto err; | |
391 | ||
392 | policy_opened = 1; | |
393 | ||
394 | filp->private_data = plm; | |
395 | ||
396 | mutex_unlock(&sel_mutex); | |
397 | ||
398 | return 0; | |
399 | err: | |
400 | mutex_unlock(&sel_mutex); | |
401 | ||
402 | if (plm) | |
403 | vfree(plm->data); | |
404 | kfree(plm); | |
405 | return rc; | |
406 | } | |
407 | ||
408 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
409 | { | |
410 | struct policy_load_memory *plm = filp->private_data; | |
411 | ||
412 | BUG_ON(!plm); | |
413 | ||
414 | policy_opened = 0; | |
415 | ||
416 | vfree(plm->data); | |
417 | kfree(plm); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
423 | size_t count, loff_t *ppos) | |
424 | { | |
425 | struct policy_load_memory *plm = filp->private_data; | |
426 | int ret; | |
427 | ||
428 | mutex_lock(&sel_mutex); | |
429 | ||
430 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
431 | if (ret) | |
432 | goto out; | |
433 | ||
434 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
435 | out: | |
436 | mutex_unlock(&sel_mutex); | |
437 | return ret; | |
438 | } | |
439 | ||
845ca30f EP |
440 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
441 | struct vm_fault *vmf) | |
442 | { | |
443 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
444 | unsigned long offset; | |
445 | struct page *page; | |
446 | ||
447 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
448 | return VM_FAULT_SIGBUS; | |
449 | ||
450 | offset = vmf->pgoff << PAGE_SHIFT; | |
451 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
452 | return VM_FAULT_SIGBUS; | |
453 | ||
454 | page = vmalloc_to_page(plm->data + offset); | |
455 | get_page(page); | |
456 | ||
457 | vmf->page = page; | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
7cbea8dc | 462 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
463 | .fault = sel_mmap_policy_fault, |
464 | .page_mkwrite = sel_mmap_policy_fault, | |
465 | }; | |
466 | ||
ad3fa08c | 467 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
468 | { |
469 | if (vma->vm_flags & VM_SHARED) { | |
470 | /* do not allow mprotect to make mapping writable */ | |
471 | vma->vm_flags &= ~VM_MAYWRITE; | |
472 | ||
473 | if (vma->vm_flags & VM_WRITE) | |
474 | return -EACCES; | |
475 | } | |
476 | ||
314e51b9 | 477 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
478 | vma->vm_ops = &sel_mmap_policy_ops; |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
cee74f47 EP |
483 | static const struct file_operations sel_policy_ops = { |
484 | .open = sel_open_policy, | |
485 | .read = sel_read_policy, | |
845ca30f | 486 | .mmap = sel_mmap_policy, |
cee74f47 | 487 | .release = sel_release_policy, |
47a93a5b | 488 | .llseek = generic_file_llseek, |
cee74f47 EP |
489 | }; |
490 | ||
1872981b | 491 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
492 | size_t count, loff_t *ppos) |
493 | ||
494 | { | |
1da177e4 LT |
495 | ssize_t length; |
496 | void *data = NULL; | |
497 | ||
bb003079 | 498 | mutex_lock(&sel_mutex); |
1da177e4 LT |
499 | |
500 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
501 | if (length) | |
502 | goto out; | |
503 | ||
b77a493b EP |
504 | /* No partial writes. */ |
505 | length = -EINVAL; | |
506 | if (*ppos != 0) | |
1da177e4 | 507 | goto out; |
1da177e4 | 508 | |
b77a493b EP |
509 | length = -EFBIG; |
510 | if (count > 64 * 1024 * 1024) | |
511 | goto out; | |
512 | ||
513 | length = -ENOMEM; | |
514 | data = vmalloc(count); | |
515 | if (!data) | |
1da177e4 | 516 | goto out; |
1da177e4 LT |
517 | |
518 | length = -EFAULT; | |
519 | if (copy_from_user(data, buf, count) != 0) | |
520 | goto out; | |
521 | ||
522 | length = security_load_policy(data, count); | |
523 | if (length) | |
524 | goto out; | |
525 | ||
b77a493b EP |
526 | length = sel_make_bools(); |
527 | if (length) | |
e47c8fc5 | 528 | goto out1; |
e47c8fc5 | 529 | |
b77a493b EP |
530 | length = sel_make_classes(); |
531 | if (length) | |
3bb56b25 | 532 | goto out1; |
3bb56b25 | 533 | |
b77a493b EP |
534 | length = sel_make_policycap(); |
535 | if (length) | |
536 | goto out1; | |
537 | ||
538 | length = count; | |
e47c8fc5 CP |
539 | |
540 | out1: | |
af601e46 | 541 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 542 | "policy loaded auid=%u ses=%u", |
581abc09 | 543 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 544 | audit_get_sessionid(current)); |
1da177e4 | 545 | out: |
bb003079 | 546 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
547 | vfree(data); |
548 | return length; | |
549 | } | |
550 | ||
9c2e08c5 | 551 | static const struct file_operations sel_load_ops = { |
1da177e4 | 552 | .write = sel_write_load, |
57a62c23 | 553 | .llseek = generic_file_llseek, |
1da177e4 LT |
554 | }; |
555 | ||
1872981b | 556 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 557 | { |
b77a493b | 558 | char *canon = NULL; |
ce9982d0 | 559 | u32 sid, len; |
1da177e4 LT |
560 | ssize_t length; |
561 | ||
562 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
563 | if (length) | |
b77a493b | 564 | goto out; |
1da177e4 | 565 | |
52a4c640 | 566 | length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
567 | if (length) |
568 | goto out; | |
1da177e4 | 569 | |
ce9982d0 | 570 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
571 | if (length) |
572 | goto out; | |
ce9982d0 | 573 | |
b77a493b | 574 | length = -ERANGE; |
ce9982d0 | 575 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
576 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
577 | "payload max\n", __func__, len); | |
1da177e4 | 578 | goto out; |
ce9982d0 | 579 | } |
1da177e4 | 580 | |
ce9982d0 SS |
581 | memcpy(buf, canon, len); |
582 | length = len; | |
1da177e4 | 583 | out: |
ce9982d0 | 584 | kfree(canon); |
1da177e4 LT |
585 | return length; |
586 | } | |
587 | ||
1da177e4 LT |
588 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
589 | size_t count, loff_t *ppos) | |
590 | { | |
591 | char tmpbuf[TMPBUFLEN]; | |
592 | ssize_t length; | |
593 | ||
594 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
595 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
596 | } | |
597 | ||
1872981b | 598 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
599 | size_t count, loff_t *ppos) |
600 | { | |
8365a719 | 601 | char *page; |
1da177e4 LT |
602 | ssize_t length; |
603 | unsigned int new_value; | |
604 | ||
605 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
606 | if (length) | |
8365a719 | 607 | return length; |
1da177e4 | 608 | |
bfd51626 | 609 | if (count >= PAGE_SIZE) |
8365a719 | 610 | return -ENOMEM; |
b77a493b EP |
611 | |
612 | /* No partial writes. */ | |
b77a493b | 613 | if (*ppos != 0) |
8365a719 | 614 | return -EINVAL; |
b77a493b | 615 | |
8365a719 AV |
616 | page = memdup_user_nul(buf, count); |
617 | if (IS_ERR(page)) | |
618 | return PTR_ERR(page); | |
1da177e4 LT |
619 | |
620 | length = -EINVAL; | |
621 | if (sscanf(page, "%u", &new_value) != 1) | |
622 | goto out; | |
623 | ||
624 | selinux_checkreqprot = new_value ? 1 : 0; | |
625 | length = count; | |
626 | out: | |
8365a719 | 627 | kfree(page); |
1da177e4 LT |
628 | return length; |
629 | } | |
9c2e08c5 | 630 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
631 | .read = sel_read_checkreqprot, |
632 | .write = sel_write_checkreqprot, | |
57a62c23 | 633 | .llseek = generic_file_llseek, |
1da177e4 LT |
634 | }; |
635 | ||
f9df6458 AP |
636 | static ssize_t sel_write_validatetrans(struct file *file, |
637 | const char __user *buf, | |
638 | size_t count, loff_t *ppos) | |
639 | { | |
640 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; | |
641 | char *req = NULL; | |
642 | u32 osid, nsid, tsid; | |
643 | u16 tclass; | |
644 | int rc; | |
645 | ||
646 | rc = task_has_security(current, SECURITY__VALIDATE_TRANS); | |
647 | if (rc) | |
648 | goto out; | |
649 | ||
650 | rc = -ENOMEM; | |
651 | if (count >= PAGE_SIZE) | |
652 | goto out; | |
653 | ||
654 | /* No partial writes. */ | |
655 | rc = -EINVAL; | |
656 | if (*ppos != 0) | |
657 | goto out; | |
658 | ||
659 | rc = -ENOMEM; | |
660 | req = kzalloc(count + 1, GFP_KERNEL); | |
661 | if (!req) | |
662 | goto out; | |
663 | ||
664 | rc = -EFAULT; | |
665 | if (copy_from_user(req, buf, count)) | |
666 | goto out; | |
667 | ||
668 | rc = -ENOMEM; | |
669 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
670 | if (!oldcon) | |
671 | goto out; | |
672 | ||
673 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
674 | if (!newcon) | |
675 | goto out; | |
676 | ||
677 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
678 | if (!taskcon) | |
679 | goto out; | |
680 | ||
681 | rc = -EINVAL; | |
682 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
683 | goto out; | |
684 | ||
685 | rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); | |
686 | if (rc) | |
687 | goto out; | |
688 | ||
689 | rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); | |
690 | if (rc) | |
691 | goto out; | |
692 | ||
693 | rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); | |
694 | if (rc) | |
695 | goto out; | |
696 | ||
697 | rc = security_validate_transition_user(osid, nsid, tsid, tclass); | |
698 | if (!rc) | |
699 | rc = count; | |
700 | out: | |
701 | kfree(req); | |
702 | kfree(oldcon); | |
703 | kfree(newcon); | |
704 | kfree(taskcon); | |
705 | return rc; | |
706 | } | |
707 | ||
708 | static const struct file_operations sel_transition_ops = { | |
709 | .write = sel_write_validatetrans, | |
710 | .llseek = generic_file_llseek, | |
711 | }; | |
712 | ||
1da177e4 LT |
713 | /* |
714 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
715 | */ | |
1872981b EP |
716 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
717 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
718 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
719 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
720 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
721 | |
722 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
723 | [SEL_ACCESS] = sel_write_access, | |
724 | [SEL_CREATE] = sel_write_create, | |
725 | [SEL_RELABEL] = sel_write_relabel, | |
726 | [SEL_USER] = sel_write_user, | |
727 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 728 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
729 | }; |
730 | ||
731 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
732 | { | |
496ad9aa | 733 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
734 | char *data; |
735 | ssize_t rv; | |
736 | ||
6e20a64a | 737 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
738 | return -EINVAL; |
739 | ||
740 | data = simple_transaction_get(file, buf, size); | |
741 | if (IS_ERR(data)) | |
742 | return PTR_ERR(data); | |
743 | ||
1872981b EP |
744 | rv = write_op[ino](file, data, size); |
745 | if (rv > 0) { | |
1da177e4 LT |
746 | simple_transaction_set(file, rv); |
747 | rv = size; | |
748 | } | |
749 | return rv; | |
750 | } | |
751 | ||
9c2e08c5 | 752 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
753 | .write = selinux_transaction_write, |
754 | .read = simple_transaction_read, | |
755 | .release = simple_transaction_release, | |
57a62c23 | 756 | .llseek = generic_file_llseek, |
1da177e4 LT |
757 | }; |
758 | ||
759 | /* | |
760 | * payload - write methods | |
761 | * If the method has a response, the response should be put in buf, | |
762 | * and the length returned. Otherwise return 0 or and -error. | |
763 | */ | |
764 | ||
1872981b | 765 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 766 | { |
b77a493b | 767 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
768 | u32 ssid, tsid; |
769 | u16 tclass; | |
1da177e4 LT |
770 | struct av_decision avd; |
771 | ssize_t length; | |
772 | ||
773 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
774 | if (length) | |
b77a493b | 775 | goto out; |
1da177e4 LT |
776 | |
777 | length = -ENOMEM; | |
c1a7368a | 778 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 779 | if (!scon) |
b77a493b | 780 | goto out; |
1da177e4 | 781 | |
b77a493b | 782 | length = -ENOMEM; |
c1a7368a | 783 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
784 | if (!tcon) |
785 | goto out; | |
1da177e4 LT |
786 | |
787 | length = -EINVAL; | |
19439d05 | 788 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 789 | goto out; |
1da177e4 | 790 | |
44be2f65 | 791 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
792 | if (length) |
793 | goto out; | |
794 | ||
44be2f65 | 795 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
796 | if (length) |
797 | goto out; | |
1da177e4 | 798 | |
19439d05 | 799 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
800 | |
801 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 802 | "%x %x %x %x %u %x", |
f1c6381a | 803 | avd.allowed, 0xffffffff, |
1da177e4 | 804 | avd.auditallow, avd.auditdeny, |
8a6f83af | 805 | avd.seqno, avd.flags); |
1da177e4 | 806 | out: |
b77a493b | 807 | kfree(tcon); |
1da177e4 LT |
808 | kfree(scon); |
809 | return length; | |
810 | } | |
811 | ||
1872981b | 812 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 813 | { |
b77a493b | 814 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 815 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
816 | u32 ssid, tsid, newsid; |
817 | u16 tclass; | |
818 | ssize_t length; | |
b77a493b | 819 | char *newcon = NULL; |
1da177e4 | 820 | u32 len; |
f50a3ec9 | 821 | int nargs; |
1da177e4 LT |
822 | |
823 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
824 | if (length) | |
b77a493b | 825 | goto out; |
1da177e4 LT |
826 | |
827 | length = -ENOMEM; | |
c1a7368a | 828 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 829 | if (!scon) |
b77a493b | 830 | goto out; |
1da177e4 | 831 | |
b77a493b | 832 | length = -ENOMEM; |
c1a7368a | 833 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
834 | if (!tcon) |
835 | goto out; | |
1da177e4 | 836 | |
f50a3ec9 KK |
837 | length = -ENOMEM; |
838 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
839 | if (!namebuf) | |
840 | goto out; | |
841 | ||
1da177e4 | 842 | length = -EINVAL; |
f50a3ec9 KK |
843 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
844 | if (nargs < 3 || nargs > 4) | |
b77a493b | 845 | goto out; |
0f7e4c33 KK |
846 | if (nargs == 4) { |
847 | /* | |
848 | * If and when the name of new object to be queried contains | |
849 | * either whitespace or multibyte characters, they shall be | |
850 | * encoded based on the percentage-encoding rule. | |
851 | * If not encoded, the sscanf logic picks up only left-half | |
852 | * of the supplied name; splitted by a whitespace unexpectedly. | |
853 | */ | |
854 | char *r, *w; | |
855 | int c1, c2; | |
856 | ||
857 | r = w = namebuf; | |
858 | do { | |
859 | c1 = *r++; | |
860 | if (c1 == '+') | |
861 | c1 = ' '; | |
862 | else if (c1 == '%') { | |
af7ff2c2 AS |
863 | c1 = hex_to_bin(*r++); |
864 | if (c1 < 0) | |
0f7e4c33 | 865 | goto out; |
af7ff2c2 AS |
866 | c2 = hex_to_bin(*r++); |
867 | if (c2 < 0) | |
0f7e4c33 KK |
868 | goto out; |
869 | c1 = (c1 << 4) | c2; | |
870 | } | |
871 | *w++ = c1; | |
872 | } while (c1 != '\0'); | |
873 | ||
f50a3ec9 | 874 | objname = namebuf; |
0f7e4c33 | 875 | } |
1da177e4 | 876 | |
44be2f65 | 877 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
878 | if (length) |
879 | goto out; | |
880 | ||
44be2f65 | 881 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
882 | if (length) |
883 | goto out; | |
1da177e4 | 884 | |
f50a3ec9 KK |
885 | length = security_transition_sid_user(ssid, tsid, tclass, |
886 | objname, &newsid); | |
b77a493b EP |
887 | if (length) |
888 | goto out; | |
1da177e4 LT |
889 | |
890 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
891 | if (length) |
892 | goto out; | |
1da177e4 | 893 | |
b77a493b | 894 | length = -ERANGE; |
1da177e4 | 895 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
896 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
897 | "payload max\n", __func__, len); | |
b77a493b | 898 | goto out; |
1da177e4 LT |
899 | } |
900 | ||
901 | memcpy(buf, newcon, len); | |
902 | length = len; | |
b77a493b | 903 | out: |
1da177e4 | 904 | kfree(newcon); |
f50a3ec9 | 905 | kfree(namebuf); |
1da177e4 | 906 | kfree(tcon); |
1da177e4 LT |
907 | kfree(scon); |
908 | return length; | |
909 | } | |
910 | ||
1872981b | 911 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 912 | { |
b77a493b | 913 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
914 | u32 ssid, tsid, newsid; |
915 | u16 tclass; | |
916 | ssize_t length; | |
b77a493b | 917 | char *newcon = NULL; |
1da177e4 LT |
918 | u32 len; |
919 | ||
920 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
921 | if (length) | |
b77a493b | 922 | goto out; |
1da177e4 LT |
923 | |
924 | length = -ENOMEM; | |
c1a7368a | 925 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 926 | if (!scon) |
b77a493b | 927 | goto out; |
1da177e4 | 928 | |
b77a493b | 929 | length = -ENOMEM; |
c1a7368a | 930 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
931 | if (!tcon) |
932 | goto out; | |
1da177e4 LT |
933 | |
934 | length = -EINVAL; | |
935 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 936 | goto out; |
1da177e4 | 937 | |
44be2f65 | 938 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
939 | if (length) |
940 | goto out; | |
941 | ||
44be2f65 | 942 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
943 | if (length) |
944 | goto out; | |
1da177e4 LT |
945 | |
946 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
947 | if (length) |
948 | goto out; | |
1da177e4 LT |
949 | |
950 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
951 | if (length) |
952 | goto out; | |
1da177e4 | 953 | |
b77a493b EP |
954 | length = -ERANGE; |
955 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
956 | goto out; | |
1da177e4 LT |
957 | |
958 | memcpy(buf, newcon, len); | |
959 | length = len; | |
b77a493b | 960 | out: |
1da177e4 | 961 | kfree(newcon); |
1da177e4 | 962 | kfree(tcon); |
1da177e4 LT |
963 | kfree(scon); |
964 | return length; | |
965 | } | |
966 | ||
1872981b | 967 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 968 | { |
b77a493b EP |
969 | char *con = NULL, *user = NULL, *ptr; |
970 | u32 sid, *sids = NULL; | |
1da177e4 LT |
971 | ssize_t length; |
972 | char *newcon; | |
973 | int i, rc; | |
974 | u32 len, nsids; | |
975 | ||
976 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
977 | if (length) | |
6eab04a8 | 978 | goto out; |
1da177e4 LT |
979 | |
980 | length = -ENOMEM; | |
c1a7368a | 981 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 982 | if (!con) |
6eab04a8 | 983 | goto out; |
1da177e4 | 984 | |
b77a493b | 985 | length = -ENOMEM; |
c1a7368a | 986 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
987 | if (!user) |
988 | goto out; | |
1da177e4 LT |
989 | |
990 | length = -EINVAL; | |
991 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 992 | goto out; |
1da177e4 | 993 | |
44be2f65 | 994 | length = security_context_str_to_sid(con, &sid, GFP_KERNEL); |
b77a493b EP |
995 | if (length) |
996 | goto out; | |
1da177e4 LT |
997 | |
998 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
999 | if (length) |
1000 | goto out; | |
1da177e4 LT |
1001 | |
1002 | length = sprintf(buf, "%u", nsids) + 1; | |
1003 | ptr = buf + length; | |
1004 | for (i = 0; i < nsids; i++) { | |
1005 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
1006 | if (rc) { | |
1007 | length = rc; | |
b77a493b | 1008 | goto out; |
1da177e4 LT |
1009 | } |
1010 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1011 | kfree(newcon); | |
1012 | length = -ERANGE; | |
b77a493b | 1013 | goto out; |
1da177e4 LT |
1014 | } |
1015 | memcpy(ptr, newcon, len); | |
1016 | kfree(newcon); | |
1017 | ptr += len; | |
1018 | length += len; | |
1019 | } | |
b77a493b | 1020 | out: |
1da177e4 | 1021 | kfree(sids); |
1da177e4 | 1022 | kfree(user); |
1da177e4 LT |
1023 | kfree(con); |
1024 | return length; | |
1025 | } | |
1026 | ||
1872981b | 1027 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1028 | { |
b77a493b | 1029 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1030 | u32 ssid, tsid, newsid; |
1031 | u16 tclass; | |
1032 | ssize_t length; | |
b77a493b | 1033 | char *newcon = NULL; |
1da177e4 LT |
1034 | u32 len; |
1035 | ||
1036 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
1037 | if (length) | |
b77a493b | 1038 | goto out; |
1da177e4 LT |
1039 | |
1040 | length = -ENOMEM; | |
c1a7368a | 1041 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1042 | if (!scon) |
6eab04a8 | 1043 | goto out; |
1da177e4 | 1044 | |
b77a493b | 1045 | length = -ENOMEM; |
c1a7368a | 1046 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1047 | if (!tcon) |
1048 | goto out; | |
1da177e4 LT |
1049 | |
1050 | length = -EINVAL; | |
1051 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1052 | goto out; |
1da177e4 | 1053 | |
44be2f65 | 1054 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1055 | if (length) |
1056 | goto out; | |
1057 | ||
44be2f65 | 1058 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1059 | if (length) |
1060 | goto out; | |
1da177e4 LT |
1061 | |
1062 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1063 | if (length) |
1064 | goto out; | |
1da177e4 LT |
1065 | |
1066 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1067 | if (length) |
1068 | goto out; | |
1da177e4 | 1069 | |
b77a493b | 1070 | length = -ERANGE; |
1da177e4 | 1071 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1072 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1073 | "payload max\n", __func__, len); | |
b77a493b | 1074 | goto out; |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | memcpy(buf, newcon, len); | |
1078 | length = len; | |
b77a493b | 1079 | out: |
1da177e4 | 1080 | kfree(newcon); |
1da177e4 | 1081 | kfree(tcon); |
1da177e4 LT |
1082 | kfree(scon); |
1083 | return length; | |
1084 | } | |
1085 | ||
1086 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1087 | { | |
1088 | struct inode *ret = new_inode(sb); | |
1089 | ||
1090 | if (ret) { | |
1091 | ret->i_mode = mode; | |
1da177e4 LT |
1092 | ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; |
1093 | } | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1da177e4 LT |
1097 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1098 | size_t count, loff_t *ppos) | |
1099 | { | |
1100 | char *page = NULL; | |
1101 | ssize_t length; | |
1da177e4 LT |
1102 | ssize_t ret; |
1103 | int cur_enforcing; | |
496ad9aa | 1104 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1105 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1106 | |
bb003079 | 1107 | mutex_lock(&sel_mutex); |
1da177e4 | 1108 | |
b77a493b EP |
1109 | ret = -EINVAL; |
1110 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1111 | goto out; |
1da177e4 | 1112 | |
b77a493b | 1113 | ret = -ENOMEM; |
1872981b | 1114 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1115 | if (!page) |
1da177e4 | 1116 | goto out; |
1da177e4 | 1117 | |
d313f948 | 1118 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1119 | if (cur_enforcing < 0) { |
1120 | ret = cur_enforcing; | |
1121 | goto out; | |
1122 | } | |
1da177e4 | 1123 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1124 | bool_pending_values[index]); |
68bdcf28 | 1125 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1126 | out: |
bb003079 | 1127 | mutex_unlock(&sel_mutex); |
b77a493b | 1128 | free_page((unsigned long)page); |
1da177e4 LT |
1129 | return ret; |
1130 | } | |
1131 | ||
1132 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1133 | size_t count, loff_t *ppos) | |
1134 | { | |
1135 | char *page = NULL; | |
d313f948 | 1136 | ssize_t length; |
1da177e4 | 1137 | int new_value; |
496ad9aa | 1138 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1139 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1140 | |
bb003079 | 1141 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1142 | |
1143 | length = task_has_security(current, SECURITY__SETBOOL); | |
1144 | if (length) | |
1145 | goto out; | |
1146 | ||
b77a493b EP |
1147 | length = -EINVAL; |
1148 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1149 | goto out; |
d313f948 | 1150 | |
b77a493b EP |
1151 | length = -ENOMEM; |
1152 | if (count >= PAGE_SIZE) | |
1da177e4 | 1153 | goto out; |
d313f948 | 1154 | |
b77a493b EP |
1155 | /* No partial writes. */ |
1156 | length = -EINVAL; | |
1157 | if (*ppos != 0) | |
1da177e4 | 1158 | goto out; |
b77a493b | 1159 | |
8365a719 AV |
1160 | page = memdup_user_nul(buf, count); |
1161 | if (IS_ERR(page)) { | |
1162 | length = PTR_ERR(page); | |
1163 | page = NULL; | |
1da177e4 | 1164 | goto out; |
8365a719 | 1165 | } |
1da177e4 LT |
1166 | |
1167 | length = -EINVAL; | |
1168 | if (sscanf(page, "%d", &new_value) != 1) | |
1169 | goto out; | |
1170 | ||
1171 | if (new_value) | |
1172 | new_value = 1; | |
1173 | ||
d313f948 | 1174 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1175 | length = count; |
1176 | ||
1177 | out: | |
bb003079 | 1178 | mutex_unlock(&sel_mutex); |
8365a719 | 1179 | kfree(page); |
1da177e4 LT |
1180 | return length; |
1181 | } | |
1182 | ||
9c2e08c5 | 1183 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1184 | .read = sel_read_bool, |
1185 | .write = sel_write_bool, | |
57a62c23 | 1186 | .llseek = generic_file_llseek, |
1da177e4 LT |
1187 | }; |
1188 | ||
1189 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1190 | const char __user *buf, | |
1191 | size_t count, loff_t *ppos) | |
1192 | { | |
1193 | char *page = NULL; | |
d313f948 | 1194 | ssize_t length; |
1da177e4 LT |
1195 | int new_value; |
1196 | ||
bb003079 | 1197 | mutex_lock(&sel_mutex); |
1da177e4 LT |
1198 | |
1199 | length = task_has_security(current, SECURITY__SETBOOL); | |
1200 | if (length) | |
1201 | goto out; | |
1202 | ||
b77a493b EP |
1203 | length = -ENOMEM; |
1204 | if (count >= PAGE_SIZE) | |
1da177e4 | 1205 | goto out; |
b77a493b EP |
1206 | |
1207 | /* No partial writes. */ | |
1208 | length = -EINVAL; | |
1209 | if (*ppos != 0) | |
1da177e4 | 1210 | goto out; |
b77a493b | 1211 | |
8365a719 AV |
1212 | page = memdup_user_nul(buf, count); |
1213 | if (IS_ERR(page)) { | |
1214 | length = PTR_ERR(page); | |
1215 | page = NULL; | |
1da177e4 | 1216 | goto out; |
8365a719 | 1217 | } |
1da177e4 LT |
1218 | |
1219 | length = -EINVAL; | |
1220 | if (sscanf(page, "%d", &new_value) != 1) | |
1221 | goto out; | |
1222 | ||
b77a493b | 1223 | length = 0; |
1872981b | 1224 | if (new_value && bool_pending_values) |
b77a493b | 1225 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1226 | |
b77a493b EP |
1227 | if (!length) |
1228 | length = count; | |
1da177e4 LT |
1229 | |
1230 | out: | |
bb003079 | 1231 | mutex_unlock(&sel_mutex); |
8365a719 | 1232 | kfree(page); |
1da177e4 LT |
1233 | return length; |
1234 | } | |
1235 | ||
9c2e08c5 | 1236 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1237 | .write = sel_commit_bools_write, |
57a62c23 | 1238 | .llseek = generic_file_llseek, |
1da177e4 LT |
1239 | }; |
1240 | ||
0c92d7c7 | 1241 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1242 | { |
ad52184b AV |
1243 | d_genocide(de); |
1244 | shrink_dcache_parent(de); | |
1da177e4 LT |
1245 | } |
1246 | ||
1247 | #define BOOL_DIR_NAME "booleans" | |
1248 | ||
1249 | static int sel_make_bools(void) | |
1250 | { | |
b77a493b | 1251 | int i, ret; |
1da177e4 LT |
1252 | ssize_t len; |
1253 | struct dentry *dentry = NULL; | |
1254 | struct dentry *dir = bool_dir; | |
1255 | struct inode *inode = NULL; | |
1256 | struct inode_security_struct *isec; | |
1257 | char **names = NULL, *page; | |
1258 | int num; | |
1259 | int *values = NULL; | |
1260 | u32 sid; | |
1261 | ||
1262 | /* remove any existing files */ | |
8007f102 XF |
1263 | for (i = 0; i < bool_num; i++) |
1264 | kfree(bool_pending_names[i]); | |
d313f948 | 1265 | kfree(bool_pending_names); |
9a5f04bf | 1266 | kfree(bool_pending_values); |
154c50ca | 1267 | bool_num = 0; |
d313f948 | 1268 | bool_pending_names = NULL; |
20c19e41 | 1269 | bool_pending_values = NULL; |
1da177e4 | 1270 | |
0c92d7c7 | 1271 | sel_remove_entries(dir); |
1da177e4 | 1272 | |
b77a493b | 1273 | ret = -ENOMEM; |
1872981b EP |
1274 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1275 | if (!page) | |
b77a493b | 1276 | goto out; |
1da177e4 LT |
1277 | |
1278 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1279 | if (ret) |
1da177e4 LT |
1280 | goto out; |
1281 | ||
1282 | for (i = 0; i < num; i++) { | |
b77a493b | 1283 | ret = -ENOMEM; |
1da177e4 | 1284 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1285 | if (!dentry) |
1286 | goto out; | |
1287 | ||
1288 | ret = -ENOMEM; | |
1da177e4 | 1289 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1290 | if (!inode) |
1291 | goto out; | |
1da177e4 | 1292 | |
b77a493b | 1293 | ret = -ENAMETOOLONG; |
cc1dad71 | 1294 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1295 | if (len >= PAGE_SIZE) |
1296 | goto out; | |
1297 | ||
1872981b EP |
1298 | isec = (struct inode_security_struct *)inode->i_security; |
1299 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1300 | if (ret) | |
b77a493b EP |
1301 | goto out; |
1302 | ||
1da177e4 LT |
1303 | isec->sid = sid; |
1304 | isec->initialized = 1; | |
1305 | inode->i_fop = &sel_bool_ops; | |
bce34bc0 | 1306 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1307 | d_add(dentry, inode); |
1308 | } | |
1309 | bool_num = num; | |
d313f948 | 1310 | bool_pending_names = names; |
1da177e4 | 1311 | bool_pending_values = values; |
b77a493b EP |
1312 | |
1313 | free_page((unsigned long)page); | |
1314 | return 0; | |
1da177e4 LT |
1315 | out: |
1316 | free_page((unsigned long)page); | |
b77a493b | 1317 | |
1da177e4 | 1318 | if (names) { |
9a5f04bf JJ |
1319 | for (i = 0; i < num; i++) |
1320 | kfree(names[i]); | |
1da177e4 LT |
1321 | kfree(names); |
1322 | } | |
20c19e41 | 1323 | kfree(values); |
0c92d7c7 | 1324 | sel_remove_entries(dir); |
b77a493b EP |
1325 | |
1326 | return ret; | |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | #define NULL_FILE_NAME "null" | |
1330 | ||
765927b2 | 1331 | struct path selinux_null; |
1da177e4 LT |
1332 | |
1333 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1334 | size_t count, loff_t *ppos) | |
1335 | { | |
1336 | char tmpbuf[TMPBUFLEN]; | |
1337 | ssize_t length; | |
1338 | ||
1339 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1340 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1341 | } | |
1342 | ||
1872981b EP |
1343 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1344 | const char __user *buf, | |
1da177e4 LT |
1345 | size_t count, loff_t *ppos) |
1346 | ||
1347 | { | |
8365a719 | 1348 | char *page; |
1da177e4 LT |
1349 | ssize_t ret; |
1350 | int new_value; | |
1351 | ||
b77a493b EP |
1352 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1353 | if (ret) | |
8365a719 | 1354 | return ret; |
1da177e4 | 1355 | |
b77a493b | 1356 | if (count >= PAGE_SIZE) |
8365a719 | 1357 | return -ENOMEM; |
1da177e4 | 1358 | |
b77a493b | 1359 | /* No partial writes. */ |
b77a493b | 1360 | if (*ppos != 0) |
8365a719 | 1361 | return -EINVAL; |
1da177e4 | 1362 | |
8365a719 AV |
1363 | page = memdup_user_nul(buf, count); |
1364 | if (IS_ERR(page)) | |
1365 | return PTR_ERR(page); | |
1da177e4 | 1366 | |
b77a493b EP |
1367 | ret = -EINVAL; |
1368 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1369 | goto out; |
1da177e4 | 1370 | |
b77a493b EP |
1371 | avc_cache_threshold = new_value; |
1372 | ||
1da177e4 | 1373 | ret = count; |
1da177e4 | 1374 | out: |
8365a719 | 1375 | kfree(page); |
1da177e4 LT |
1376 | return ret; |
1377 | } | |
1378 | ||
1379 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1380 | size_t count, loff_t *ppos) | |
1381 | { | |
1382 | char *page; | |
b77a493b | 1383 | ssize_t length; |
1da177e4 LT |
1384 | |
1385 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1386 | if (!page) |
1387 | return -ENOMEM; | |
1388 | ||
1389 | length = avc_get_hash_stats(page); | |
1390 | if (length >= 0) | |
1391 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1392 | free_page((unsigned long)page); |
b77a493b EP |
1393 | |
1394 | return length; | |
1da177e4 LT |
1395 | } |
1396 | ||
9c2e08c5 | 1397 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1398 | .read = sel_read_avc_cache_threshold, |
1399 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1400 | .llseek = generic_file_llseek, |
1da177e4 LT |
1401 | }; |
1402 | ||
9c2e08c5 | 1403 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1404 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1405 | .llseek = generic_file_llseek, |
1da177e4 LT |
1406 | }; |
1407 | ||
1408 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1409 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1410 | { | |
1411 | int cpu; | |
1412 | ||
4f4b6c1a | 1413 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1414 | if (!cpu_possible(cpu)) |
1415 | continue; | |
1416 | *idx = cpu + 1; | |
1417 | return &per_cpu(avc_cache_stats, cpu); | |
1418 | } | |
1419 | return NULL; | |
1420 | } | |
1421 | ||
1422 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1423 | { | |
1424 | loff_t n = *pos - 1; | |
1425 | ||
1426 | if (*pos == 0) | |
1427 | return SEQ_START_TOKEN; | |
1428 | ||
1429 | return sel_avc_get_stat_idx(&n); | |
1430 | } | |
1431 | ||
1432 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1433 | { | |
1434 | return sel_avc_get_stat_idx(pos); | |
1435 | } | |
1436 | ||
1437 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1438 | { | |
1439 | struct avc_cache_stats *st = v; | |
1440 | ||
1441 | if (v == SEQ_START_TOKEN) | |
1442 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1443 | "frees\n"); | |
257313b2 LT |
1444 | else { |
1445 | unsigned int lookups = st->lookups; | |
1446 | unsigned int misses = st->misses; | |
1447 | unsigned int hits = lookups - misses; | |
1448 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1449 | hits, misses, st->allocations, | |
1da177e4 | 1450 | st->reclaims, st->frees); |
257313b2 | 1451 | } |
1da177e4 LT |
1452 | return 0; |
1453 | } | |
1454 | ||
1455 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1456 | { } | |
1457 | ||
1996a109 | 1458 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1459 | .start = sel_avc_stats_seq_start, |
1460 | .next = sel_avc_stats_seq_next, | |
1461 | .show = sel_avc_stats_seq_show, | |
1462 | .stop = sel_avc_stats_seq_stop, | |
1463 | }; | |
1464 | ||
1465 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1466 | { | |
1467 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1468 | } | |
1469 | ||
9c2e08c5 | 1470 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1471 | .open = sel_open_avc_cache_stats, |
1472 | .read = seq_read, | |
1473 | .llseek = seq_lseek, | |
1474 | .release = seq_release, | |
1475 | }; | |
1476 | #endif | |
1477 | ||
1478 | static int sel_make_avc_files(struct dentry *dir) | |
1479 | { | |
b77a493b | 1480 | int i; |
1da177e4 LT |
1481 | static struct tree_descr files[] = { |
1482 | { "cache_threshold", | |
1483 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1484 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1485 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1486 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1487 | #endif | |
1488 | }; | |
1489 | ||
6e20a64a | 1490 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1491 | struct inode *inode; |
1492 | struct dentry *dentry; | |
1493 | ||
1494 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1495 | if (!dentry) |
1496 | return -ENOMEM; | |
1da177e4 LT |
1497 | |
1498 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1499 | if (!inode) |
1500 | return -ENOMEM; | |
1501 | ||
1da177e4 | 1502 | inode->i_fop = files[i].ops; |
6174eafc | 1503 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1504 | d_add(dentry, inode); |
1505 | } | |
b77a493b EP |
1506 | |
1507 | return 0; | |
1da177e4 LT |
1508 | } |
1509 | ||
1872981b | 1510 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1511 | size_t count, loff_t *ppos) |
1512 | { | |
f0ee2e46 JC |
1513 | char *con; |
1514 | u32 sid, len; | |
1515 | ssize_t ret; | |
1516 | ||
496ad9aa | 1517 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1518 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1519 | if (ret) |
f0ee2e46 JC |
1520 | return ret; |
1521 | ||
1522 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1523 | kfree(con); | |
1524 | return ret; | |
1525 | } | |
1526 | ||
1527 | static const struct file_operations sel_initcon_ops = { | |
1528 | .read = sel_read_initcon, | |
57a62c23 | 1529 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1530 | }; |
1531 | ||
1532 | static int sel_make_initcon_files(struct dentry *dir) | |
1533 | { | |
b77a493b | 1534 | int i; |
f0ee2e46 JC |
1535 | |
1536 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1537 | struct inode *inode; | |
1538 | struct dentry *dentry; | |
1539 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1540 | if (!dentry) |
1541 | return -ENOMEM; | |
f0ee2e46 JC |
1542 | |
1543 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1544 | if (!inode) |
1545 | return -ENOMEM; | |
1546 | ||
f0ee2e46 JC |
1547 | inode->i_fop = &sel_initcon_ops; |
1548 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1549 | d_add(dentry, inode); | |
1550 | } | |
b77a493b EP |
1551 | |
1552 | return 0; | |
f0ee2e46 JC |
1553 | } |
1554 | ||
e47c8fc5 CP |
1555 | static inline unsigned long sel_class_to_ino(u16 class) |
1556 | { | |
1557 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1558 | } | |
1559 | ||
1560 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1561 | { | |
92ae9e82 | 1562 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1563 | } |
1564 | ||
1565 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1566 | { | |
1567 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1568 | } | |
1569 | ||
1570 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1571 | { | |
1572 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1573 | } | |
1574 | ||
1872981b | 1575 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1576 | size_t count, loff_t *ppos) |
1577 | { | |
496ad9aa | 1578 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1579 | char res[TMPBUFLEN]; |
1580 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1581 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1582 | } |
1583 | ||
1584 | static const struct file_operations sel_class_ops = { | |
1585 | .read = sel_read_class, | |
57a62c23 | 1586 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1587 | }; |
1588 | ||
1872981b | 1589 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1590 | size_t count, loff_t *ppos) |
1591 | { | |
496ad9aa | 1592 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1593 | char res[TMPBUFLEN]; |
1594 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1595 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1596 | } |
1597 | ||
1598 | static const struct file_operations sel_perm_ops = { | |
1599 | .read = sel_read_perm, | |
57a62c23 | 1600 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1601 | }; |
1602 | ||
3bb56b25 PM |
1603 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1604 | size_t count, loff_t *ppos) | |
1605 | { | |
1606 | int value; | |
1607 | char tmpbuf[TMPBUFLEN]; | |
1608 | ssize_t length; | |
496ad9aa | 1609 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1610 | |
1611 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1612 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1613 | ||
1614 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1615 | } | |
1616 | ||
1617 | static const struct file_operations sel_policycap_ops = { | |
1618 | .read = sel_read_policycap, | |
57a62c23 | 1619 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1620 | }; |
1621 | ||
e47c8fc5 CP |
1622 | static int sel_make_perm_files(char *objclass, int classvalue, |
1623 | struct dentry *dir) | |
1624 | { | |
b77a493b | 1625 | int i, rc, nperms; |
e47c8fc5 CP |
1626 | char **perms; |
1627 | ||
1628 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1629 | if (rc) | |
b77a493b | 1630 | return rc; |
e47c8fc5 CP |
1631 | |
1632 | for (i = 0; i < nperms; i++) { | |
1633 | struct inode *inode; | |
1634 | struct dentry *dentry; | |
1635 | ||
b77a493b | 1636 | rc = -ENOMEM; |
e47c8fc5 | 1637 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1638 | if (!dentry) |
1639 | goto out; | |
e47c8fc5 | 1640 | |
b77a493b | 1641 | rc = -ENOMEM; |
e47c8fc5 | 1642 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1643 | if (!inode) |
1644 | goto out; | |
1645 | ||
e47c8fc5 CP |
1646 | inode->i_fop = &sel_perm_ops; |
1647 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1648 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1649 | d_add(dentry, inode); |
1650 | } | |
b77a493b EP |
1651 | rc = 0; |
1652 | out: | |
e47c8fc5 CP |
1653 | for (i = 0; i < nperms; i++) |
1654 | kfree(perms[i]); | |
1655 | kfree(perms); | |
e47c8fc5 CP |
1656 | return rc; |
1657 | } | |
1658 | ||
1659 | static int sel_make_class_dir_entries(char *classname, int index, | |
1660 | struct dentry *dir) | |
1661 | { | |
1662 | struct dentry *dentry = NULL; | |
1663 | struct inode *inode = NULL; | |
1664 | int rc; | |
1665 | ||
1666 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1667 | if (!dentry) |
1668 | return -ENOMEM; | |
e47c8fc5 CP |
1669 | |
1670 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1671 | if (!inode) |
1672 | return -ENOMEM; | |
e47c8fc5 CP |
1673 | |
1674 | inode->i_fop = &sel_class_ops; | |
1675 | inode->i_ino = sel_class_to_ino(index); | |
1676 | d_add(dentry, inode); | |
1677 | ||
a1c2aa1e AV |
1678 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1679 | if (IS_ERR(dentry)) | |
1680 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1681 | |
1682 | rc = sel_make_perm_files(classname, index, dentry); | |
1683 | ||
e47c8fc5 CP |
1684 | return rc; |
1685 | } | |
1686 | ||
e47c8fc5 CP |
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 */ | |
ad52184b | 1693 | sel_remove_entries(class_dir); |
e47c8fc5 CP |
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 */ |
ce0b16dd | 1778 | inc_nlink(d_inode(dir)); |
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}, |
f9df6458 AP |
1808 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1809 | S_IWUGO}, | |
1da177e4 LT |
1810 | /* last one */ {""} |
1811 | }; | |
1812 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1813 | if (ret) | |
161ce45a | 1814 | goto err; |
1da177e4 | 1815 | |
a1c2aa1e AV |
1816 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1817 | if (IS_ERR(bool_dir)) { | |
1818 | ret = PTR_ERR(bool_dir); | |
1819 | bool_dir = NULL; | |
161ce45a | 1820 | goto err; |
a1c2aa1e | 1821 | } |
1da177e4 | 1822 | |
b77a493b | 1823 | ret = -ENOMEM; |
1da177e4 | 1824 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1825 | if (!dentry) |
161ce45a | 1826 | goto err; |
1da177e4 | 1827 | |
b77a493b | 1828 | ret = -ENOMEM; |
1da177e4 | 1829 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1830 | if (!inode) |
161ce45a | 1831 | goto err; |
b77a493b | 1832 | |
6174eafc | 1833 | inode->i_ino = ++sel_last_ino; |
1872981b | 1834 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1835 | isec->sid = SECINITSID_DEVNULL; |
1836 | isec->sclass = SECCLASS_CHR_FILE; | |
1837 | isec->initialized = 1; | |
1838 | ||
1839 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1840 | d_add(dentry, inode); | |
765927b2 | 1841 | selinux_null.dentry = dentry; |
1da177e4 | 1842 | |
a1c2aa1e AV |
1843 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1844 | if (IS_ERR(dentry)) { | |
1845 | ret = PTR_ERR(dentry); | |
161ce45a | 1846 | goto err; |
a1c2aa1e | 1847 | } |
1da177e4 LT |
1848 | |
1849 | ret = sel_make_avc_files(dentry); | |
1850 | if (ret) | |
161ce45a | 1851 | goto err; |
f0ee2e46 | 1852 | |
a1c2aa1e AV |
1853 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1854 | if (IS_ERR(dentry)) { | |
1855 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1856 | goto err; |
a1c2aa1e | 1857 | } |
f0ee2e46 JC |
1858 | |
1859 | ret = sel_make_initcon_files(dentry); | |
1860 | if (ret) | |
1861 | goto err; | |
1862 | ||
a1c2aa1e AV |
1863 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1864 | if (IS_ERR(class_dir)) { | |
1865 | ret = PTR_ERR(class_dir); | |
1866 | class_dir = NULL; | |
3bb56b25 | 1867 | goto err; |
a1c2aa1e | 1868 | } |
3bb56b25 | 1869 | |
a1c2aa1e AV |
1870 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1871 | if (IS_ERR(policycap_dir)) { | |
1872 | ret = PTR_ERR(policycap_dir); | |
1873 | policycap_dir = NULL; | |
3bb56b25 | 1874 | goto err; |
a1c2aa1e | 1875 | } |
b77a493b | 1876 | return 0; |
161ce45a | 1877 | err: |
744ba35e EP |
1878 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1879 | __func__); | |
b77a493b | 1880 | return ret; |
1da177e4 LT |
1881 | } |
1882 | ||
fc14f2fe AV |
1883 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1884 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1885 | { |
fc14f2fe | 1886 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1887 | } |
1888 | ||
1889 | static struct file_system_type sel_fs_type = { | |
1890 | .name = "selinuxfs", | |
fc14f2fe | 1891 | .mount = sel_mount, |
1da177e4 LT |
1892 | .kill_sb = kill_litter_super, |
1893 | }; | |
1894 | ||
1895 | struct vfsmount *selinuxfs_mount; | |
1896 | ||
1897 | static int __init init_sel_fs(void) | |
1898 | { | |
1899 | int err; | |
1900 | ||
1901 | if (!selinux_enabled) | |
1902 | return 0; | |
7a627e3b | 1903 | |
f9bb4882 EB |
1904 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
1905 | if (err) | |
1906 | return err; | |
7a627e3b | 1907 | |
1da177e4 | 1908 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 1909 | if (err) { |
f9bb4882 | 1910 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 1911 | return err; |
7a627e3b | 1912 | } |
b77a493b | 1913 | |
765927b2 | 1914 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1915 | if (IS_ERR(selinuxfs_mount)) { |
1916 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1917 | err = PTR_ERR(selinuxfs_mount); | |
1918 | selinuxfs_mount = NULL; | |
1da177e4 | 1919 | } |
b77a493b | 1920 | |
1da177e4 LT |
1921 | return err; |
1922 | } | |
1923 | ||
1924 | __initcall(init_sel_fs); | |
1925 | ||
1926 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1927 | void exit_sel_fs(void) | |
1928 | { | |
f9bb4882 | 1929 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
423e0ab0 | 1930 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1931 | unregister_filesystem(&sel_fs_type); |
1932 | } | |
1933 | #endif |