]>
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 | 47 | "open_perms", |
da69a530 | 48 | "extended_socket_class", |
2651225b SS |
49 | "always_check_network", |
50 | "cgroup_seclabel" | |
3bb56b25 PM |
51 | }; |
52 | ||
1da177e4 LT |
53 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
54 | ||
55 | static int __init checkreqprot_setup(char *str) | |
56 | { | |
f5269710 | 57 | unsigned long checkreqprot; |
29707b20 | 58 | if (!kstrtoul(str, 0, &checkreqprot)) |
f5269710 | 59 | selinux_checkreqprot = checkreqprot ? 1 : 0; |
1da177e4 LT |
60 | return 1; |
61 | } | |
62 | __setup("checkreqprot=", checkreqprot_setup); | |
63 | ||
bb003079 | 64 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
65 | |
66 | /* global data for booleans */ | |
1872981b EP |
67 | static struct dentry *bool_dir; |
68 | static int bool_num; | |
d313f948 | 69 | static char **bool_pending_names; |
1872981b | 70 | static int *bool_pending_values; |
1da177e4 | 71 | |
e47c8fc5 | 72 | /* global data for classes */ |
1872981b | 73 | static struct dentry *class_dir; |
e47c8fc5 CP |
74 | static unsigned long last_class_ino; |
75 | ||
cee74f47 EP |
76 | static char policy_opened; |
77 | ||
3bb56b25 | 78 | /* global data for policy capabilities */ |
1872981b | 79 | static struct dentry *policycap_dir; |
3bb56b25 | 80 | |
1da177e4 LT |
81 | enum sel_inos { |
82 | SEL_ROOT_INO = 2, | |
83 | SEL_LOAD, /* load policy */ | |
84 | SEL_ENFORCE, /* get or set enforcing status */ | |
85 | SEL_CONTEXT, /* validate context */ | |
86 | SEL_ACCESS, /* compute access decision */ | |
87 | SEL_CREATE, /* compute create labeling decision */ | |
88 | SEL_RELABEL, /* compute relabeling decision */ | |
89 | SEL_USER, /* compute reachable user contexts */ | |
90 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
91 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
92 | SEL_MLS, /* return if MLS policy is enabled */ | |
93 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
94 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
95 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 96 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
97 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
98 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 99 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 100 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 101 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 102 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
103 | }; |
104 | ||
6174eafc JC |
105 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
106 | ||
3bb56b25 PM |
107 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
108 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
109 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
110 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
111 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 112 | |
1da177e4 LT |
113 | #define TMPBUFLEN 12 |
114 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
115 | size_t count, loff_t *ppos) | |
116 | { | |
117 | char tmpbuf[TMPBUFLEN]; | |
118 | ssize_t length; | |
119 | ||
120 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
121 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
122 | } | |
123 | ||
124 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 125 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
126 | size_t count, loff_t *ppos) |
127 | ||
128 | { | |
b77a493b | 129 | char *page = NULL; |
1da177e4 LT |
130 | ssize_t length; |
131 | int new_value; | |
132 | ||
bfd51626 | 133 | if (count >= PAGE_SIZE) |
8365a719 | 134 | return -ENOMEM; |
b77a493b EP |
135 | |
136 | /* No partial writes. */ | |
b77a493b | 137 | if (*ppos != 0) |
8365a719 | 138 | return -EINVAL; |
b77a493b | 139 | |
8365a719 AV |
140 | page = memdup_user_nul(buf, count); |
141 | if (IS_ERR(page)) | |
142 | return PTR_ERR(page); | |
1da177e4 LT |
143 | |
144 | length = -EINVAL; | |
145 | if (sscanf(page, "%d", &new_value) != 1) | |
146 | goto out; | |
147 | ||
ea49d10e SS |
148 | new_value = !!new_value; |
149 | ||
1da177e4 | 150 | if (new_value != selinux_enforcing) { |
be0554c9 SS |
151 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
152 | SECCLASS_SECURITY, SECURITY__SETENFORCE, | |
153 | NULL); | |
1da177e4 LT |
154 | if (length) |
155 | goto out; | |
af601e46 | 156 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
157 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
158 | new_value, selinux_enforcing, | |
581abc09 | 159 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 160 | audit_get_sessionid(current)); |
1da177e4 LT |
161 | selinux_enforcing = new_value; |
162 | if (selinux_enforcing) | |
163 | avc_ss_reset(0); | |
164 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 165 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
166 | } |
167 | length = count; | |
168 | out: | |
8365a719 | 169 | kfree(page); |
1da177e4 LT |
170 | return length; |
171 | } | |
172 | #else | |
173 | #define sel_write_enforce NULL | |
174 | #endif | |
175 | ||
9c2e08c5 | 176 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
177 | .read = sel_read_enforce, |
178 | .write = sel_write_enforce, | |
57a62c23 | 179 | .llseek = generic_file_llseek, |
1da177e4 LT |
180 | }; |
181 | ||
3f12070e EP |
182 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
183 | size_t count, loff_t *ppos) | |
184 | { | |
185 | char tmpbuf[TMPBUFLEN]; | |
186 | ssize_t length; | |
496ad9aa | 187 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
188 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
189 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
190 | ||
191 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
192 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
193 | } | |
194 | ||
195 | static const struct file_operations sel_handle_unknown_ops = { | |
196 | .read = sel_read_handle_unknown, | |
57a62c23 | 197 | .llseek = generic_file_llseek, |
3f12070e EP |
198 | }; |
199 | ||
11904167 KK |
200 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
201 | { | |
202 | struct page *status = selinux_kernel_status_page(); | |
203 | ||
204 | if (!status) | |
205 | return -ENOMEM; | |
206 | ||
207 | filp->private_data = status; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
213 | size_t count, loff_t *ppos) | |
214 | { | |
215 | struct page *status = filp->private_data; | |
216 | ||
217 | BUG_ON(!status); | |
218 | ||
219 | return simple_read_from_buffer(buf, count, ppos, | |
220 | page_address(status), | |
221 | sizeof(struct selinux_kernel_status)); | |
222 | } | |
223 | ||
224 | static int sel_mmap_handle_status(struct file *filp, | |
225 | struct vm_area_struct *vma) | |
226 | { | |
227 | struct page *status = filp->private_data; | |
228 | unsigned long size = vma->vm_end - vma->vm_start; | |
229 | ||
230 | BUG_ON(!status); | |
231 | ||
232 | /* only allows one page from the head */ | |
233 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
234 | return -EIO; | |
235 | /* disallow writable mapping */ | |
236 | if (vma->vm_flags & VM_WRITE) | |
237 | return -EPERM; | |
238 | /* disallow mprotect() turns it into writable */ | |
239 | vma->vm_flags &= ~VM_MAYWRITE; | |
240 | ||
241 | return remap_pfn_range(vma, vma->vm_start, | |
242 | page_to_pfn(status), | |
243 | size, vma->vm_page_prot); | |
244 | } | |
245 | ||
246 | static const struct file_operations sel_handle_status_ops = { | |
247 | .open = sel_open_handle_status, | |
248 | .read = sel_read_handle_status, | |
249 | .mmap = sel_mmap_handle_status, | |
250 | .llseek = generic_file_llseek, | |
251 | }; | |
252 | ||
1da177e4 | 253 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 254 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
255 | size_t count, loff_t *ppos) |
256 | ||
257 | { | |
8365a719 | 258 | char *page; |
1da177e4 LT |
259 | ssize_t length; |
260 | int new_value; | |
1da177e4 | 261 | |
bfd51626 | 262 | if (count >= PAGE_SIZE) |
8365a719 | 263 | return -ENOMEM; |
b77a493b EP |
264 | |
265 | /* No partial writes. */ | |
b77a493b | 266 | if (*ppos != 0) |
8365a719 | 267 | return -EINVAL; |
b77a493b | 268 | |
8365a719 AV |
269 | page = memdup_user_nul(buf, count); |
270 | if (IS_ERR(page)) | |
271 | return PTR_ERR(page); | |
1da177e4 LT |
272 | |
273 | length = -EINVAL; | |
274 | if (sscanf(page, "%d", &new_value) != 1) | |
275 | goto out; | |
276 | ||
277 | if (new_value) { | |
278 | length = selinux_disable(); | |
b77a493b | 279 | if (length) |
1da177e4 | 280 | goto out; |
af601e46 | 281 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b | 282 | "selinux=0 auid=%u ses=%u", |
581abc09 | 283 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 284 | audit_get_sessionid(current)); |
1da177e4 LT |
285 | } |
286 | ||
287 | length = count; | |
288 | out: | |
8365a719 | 289 | kfree(page); |
1da177e4 LT |
290 | return length; |
291 | } | |
292 | #else | |
293 | #define sel_write_disable NULL | |
294 | #endif | |
295 | ||
9c2e08c5 | 296 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 297 | .write = sel_write_disable, |
57a62c23 | 298 | .llseek = generic_file_llseek, |
1da177e4 LT |
299 | }; |
300 | ||
301 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 302 | size_t count, loff_t *ppos) |
1da177e4 LT |
303 | { |
304 | char tmpbuf[TMPBUFLEN]; | |
305 | ssize_t length; | |
306 | ||
307 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
308 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
309 | } | |
310 | ||
9c2e08c5 | 311 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 312 | .read = sel_read_policyvers, |
57a62c23 | 313 | .llseek = generic_file_llseek, |
1da177e4 LT |
314 | }; |
315 | ||
316 | /* declaration for sel_write_load */ | |
317 | static int sel_make_bools(void); | |
e47c8fc5 | 318 | static int sel_make_classes(void); |
3bb56b25 | 319 | static int sel_make_policycap(void); |
e47c8fc5 CP |
320 | |
321 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 322 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 323 | unsigned long *ino); |
1da177e4 LT |
324 | |
325 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
326 | size_t count, loff_t *ppos) | |
327 | { | |
328 | char tmpbuf[TMPBUFLEN]; | |
329 | ssize_t length; | |
330 | ||
0719aaf5 GT |
331 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
332 | security_mls_enabled()); | |
1da177e4 LT |
333 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
334 | } | |
335 | ||
9c2e08c5 | 336 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 337 | .read = sel_read_mls, |
57a62c23 | 338 | .llseek = generic_file_llseek, |
1da177e4 LT |
339 | }; |
340 | ||
cee74f47 EP |
341 | struct policy_load_memory { |
342 | size_t len; | |
343 | void *data; | |
344 | }; | |
345 | ||
346 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
347 | { | |
348 | struct policy_load_memory *plm = NULL; | |
349 | int rc; | |
350 | ||
351 | BUG_ON(filp->private_data); | |
352 | ||
353 | mutex_lock(&sel_mutex); | |
354 | ||
be0554c9 SS |
355 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
356 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); | |
cee74f47 EP |
357 | if (rc) |
358 | goto err; | |
359 | ||
360 | rc = -EBUSY; | |
361 | if (policy_opened) | |
362 | goto err; | |
363 | ||
364 | rc = -ENOMEM; | |
365 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
366 | if (!plm) | |
367 | goto err; | |
368 | ||
369 | if (i_size_read(inode) != security_policydb_len()) { | |
5955102c | 370 | inode_lock(inode); |
cee74f47 | 371 | i_size_write(inode, security_policydb_len()); |
5955102c | 372 | inode_unlock(inode); |
cee74f47 EP |
373 | } |
374 | ||
375 | rc = security_read_policy(&plm->data, &plm->len); | |
376 | if (rc) | |
377 | goto err; | |
378 | ||
379 | policy_opened = 1; | |
380 | ||
381 | filp->private_data = plm; | |
382 | ||
383 | mutex_unlock(&sel_mutex); | |
384 | ||
385 | return 0; | |
386 | err: | |
387 | mutex_unlock(&sel_mutex); | |
388 | ||
389 | if (plm) | |
390 | vfree(plm->data); | |
391 | kfree(plm); | |
392 | return rc; | |
393 | } | |
394 | ||
395 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
396 | { | |
397 | struct policy_load_memory *plm = filp->private_data; | |
398 | ||
399 | BUG_ON(!plm); | |
400 | ||
401 | policy_opened = 0; | |
402 | ||
403 | vfree(plm->data); | |
404 | kfree(plm); | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
410 | size_t count, loff_t *ppos) | |
411 | { | |
412 | struct policy_load_memory *plm = filp->private_data; | |
413 | int ret; | |
414 | ||
415 | mutex_lock(&sel_mutex); | |
416 | ||
be0554c9 SS |
417 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
418 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); | |
cee74f47 EP |
419 | if (ret) |
420 | goto out; | |
421 | ||
422 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
423 | out: | |
424 | mutex_unlock(&sel_mutex); | |
425 | return ret; | |
426 | } | |
427 | ||
11bac800 | 428 | static int sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 429 | { |
11bac800 | 430 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
431 | unsigned long offset; |
432 | struct page *page; | |
433 | ||
434 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
435 | return VM_FAULT_SIGBUS; | |
436 | ||
437 | offset = vmf->pgoff << PAGE_SHIFT; | |
438 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
439 | return VM_FAULT_SIGBUS; | |
440 | ||
441 | page = vmalloc_to_page(plm->data + offset); | |
442 | get_page(page); | |
443 | ||
444 | vmf->page = page; | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
7cbea8dc | 449 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
450 | .fault = sel_mmap_policy_fault, |
451 | .page_mkwrite = sel_mmap_policy_fault, | |
452 | }; | |
453 | ||
ad3fa08c | 454 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
455 | { |
456 | if (vma->vm_flags & VM_SHARED) { | |
457 | /* do not allow mprotect to make mapping writable */ | |
458 | vma->vm_flags &= ~VM_MAYWRITE; | |
459 | ||
460 | if (vma->vm_flags & VM_WRITE) | |
461 | return -EACCES; | |
462 | } | |
463 | ||
314e51b9 | 464 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
465 | vma->vm_ops = &sel_mmap_policy_ops; |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
cee74f47 EP |
470 | static const struct file_operations sel_policy_ops = { |
471 | .open = sel_open_policy, | |
472 | .read = sel_read_policy, | |
845ca30f | 473 | .mmap = sel_mmap_policy, |
cee74f47 | 474 | .release = sel_release_policy, |
47a93a5b | 475 | .llseek = generic_file_llseek, |
cee74f47 EP |
476 | }; |
477 | ||
1872981b | 478 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
479 | size_t count, loff_t *ppos) |
480 | ||
481 | { | |
1da177e4 LT |
482 | ssize_t length; |
483 | void *data = NULL; | |
484 | ||
bb003079 | 485 | mutex_lock(&sel_mutex); |
1da177e4 | 486 | |
be0554c9 SS |
487 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
488 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); | |
1da177e4 LT |
489 | if (length) |
490 | goto out; | |
491 | ||
b77a493b EP |
492 | /* No partial writes. */ |
493 | length = -EINVAL; | |
494 | if (*ppos != 0) | |
1da177e4 | 495 | goto out; |
1da177e4 | 496 | |
b77a493b EP |
497 | length = -EFBIG; |
498 | if (count > 64 * 1024 * 1024) | |
499 | goto out; | |
500 | ||
501 | length = -ENOMEM; | |
502 | data = vmalloc(count); | |
503 | if (!data) | |
1da177e4 | 504 | goto out; |
1da177e4 LT |
505 | |
506 | length = -EFAULT; | |
507 | if (copy_from_user(data, buf, count) != 0) | |
508 | goto out; | |
509 | ||
510 | length = security_load_policy(data, count); | |
4262fb51 GT |
511 | if (length) { |
512 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 513 | goto out; |
4262fb51 | 514 | } |
1da177e4 | 515 | |
b77a493b | 516 | length = sel_make_bools(); |
4262fb51 GT |
517 | if (length) { |
518 | pr_err("SELinux: failed to load policy booleans\n"); | |
e47c8fc5 | 519 | goto out1; |
4262fb51 | 520 | } |
e47c8fc5 | 521 | |
b77a493b | 522 | length = sel_make_classes(); |
4262fb51 GT |
523 | if (length) { |
524 | pr_err("SELinux: failed to load policy classes\n"); | |
3bb56b25 | 525 | goto out1; |
4262fb51 | 526 | } |
3bb56b25 | 527 | |
b77a493b | 528 | length = sel_make_policycap(); |
4262fb51 GT |
529 | if (length) { |
530 | pr_err("SELinux: failed to load policy capabilities\n"); | |
b77a493b | 531 | goto out1; |
4262fb51 | 532 | } |
b77a493b EP |
533 | |
534 | length = count; | |
e47c8fc5 CP |
535 | |
536 | out1: | |
af601e46 | 537 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 538 | "policy loaded auid=%u ses=%u", |
581abc09 | 539 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 540 | audit_get_sessionid(current)); |
1da177e4 | 541 | out: |
bb003079 | 542 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
543 | vfree(data); |
544 | return length; | |
545 | } | |
546 | ||
9c2e08c5 | 547 | static const struct file_operations sel_load_ops = { |
1da177e4 | 548 | .write = sel_write_load, |
57a62c23 | 549 | .llseek = generic_file_llseek, |
1da177e4 LT |
550 | }; |
551 | ||
1872981b | 552 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 553 | { |
b77a493b | 554 | char *canon = NULL; |
ce9982d0 | 555 | u32 sid, len; |
1da177e4 LT |
556 | ssize_t length; |
557 | ||
be0554c9 SS |
558 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
559 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); | |
1da177e4 | 560 | if (length) |
b77a493b | 561 | goto out; |
1da177e4 | 562 | |
52a4c640 | 563 | length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
564 | if (length) |
565 | goto out; | |
1da177e4 | 566 | |
ce9982d0 | 567 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
568 | if (length) |
569 | goto out; | |
ce9982d0 | 570 | |
b77a493b | 571 | length = -ERANGE; |
ce9982d0 | 572 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
573 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
574 | "payload max\n", __func__, len); | |
1da177e4 | 575 | goto out; |
ce9982d0 | 576 | } |
1da177e4 | 577 | |
ce9982d0 SS |
578 | memcpy(buf, canon, len); |
579 | length = len; | |
1da177e4 | 580 | out: |
ce9982d0 | 581 | kfree(canon); |
1da177e4 LT |
582 | return length; |
583 | } | |
584 | ||
1da177e4 LT |
585 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
586 | size_t count, loff_t *ppos) | |
587 | { | |
588 | char tmpbuf[TMPBUFLEN]; | |
589 | ssize_t length; | |
590 | ||
591 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
592 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
593 | } | |
594 | ||
1872981b | 595 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
596 | size_t count, loff_t *ppos) |
597 | { | |
8365a719 | 598 | char *page; |
1da177e4 LT |
599 | ssize_t length; |
600 | unsigned int new_value; | |
601 | ||
be0554c9 SS |
602 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
603 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, | |
604 | NULL); | |
1da177e4 | 605 | if (length) |
8365a719 | 606 | return length; |
1da177e4 | 607 | |
bfd51626 | 608 | if (count >= PAGE_SIZE) |
8365a719 | 609 | return -ENOMEM; |
b77a493b EP |
610 | |
611 | /* No partial writes. */ | |
b77a493b | 612 | if (*ppos != 0) |
8365a719 | 613 | return -EINVAL; |
b77a493b | 614 | |
8365a719 AV |
615 | page = memdup_user_nul(buf, count); |
616 | if (IS_ERR(page)) | |
617 | return PTR_ERR(page); | |
1da177e4 LT |
618 | |
619 | length = -EINVAL; | |
620 | if (sscanf(page, "%u", &new_value) != 1) | |
621 | goto out; | |
622 | ||
623 | selinux_checkreqprot = new_value ? 1 : 0; | |
624 | length = count; | |
625 | out: | |
8365a719 | 626 | kfree(page); |
1da177e4 LT |
627 | return length; |
628 | } | |
9c2e08c5 | 629 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
630 | .read = sel_read_checkreqprot, |
631 | .write = sel_write_checkreqprot, | |
57a62c23 | 632 | .llseek = generic_file_llseek, |
1da177e4 LT |
633 | }; |
634 | ||
f9df6458 AP |
635 | static ssize_t sel_write_validatetrans(struct file *file, |
636 | const char __user *buf, | |
637 | size_t count, loff_t *ppos) | |
638 | { | |
639 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; | |
640 | char *req = NULL; | |
641 | u32 osid, nsid, tsid; | |
642 | u16 tclass; | |
643 | int rc; | |
644 | ||
be0554c9 SS |
645 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
646 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); | |
f9df6458 AP |
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 | ||
be0554c9 SS |
773 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
774 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); | |
1da177e4 | 775 | if (length) |
b77a493b | 776 | goto out; |
1da177e4 LT |
777 | |
778 | length = -ENOMEM; | |
c1a7368a | 779 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 780 | if (!scon) |
b77a493b | 781 | goto out; |
1da177e4 | 782 | |
b77a493b | 783 | length = -ENOMEM; |
c1a7368a | 784 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
785 | if (!tcon) |
786 | goto out; | |
1da177e4 LT |
787 | |
788 | length = -EINVAL; | |
19439d05 | 789 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 790 | goto out; |
1da177e4 | 791 | |
44be2f65 | 792 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
793 | if (length) |
794 | goto out; | |
795 | ||
44be2f65 | 796 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
797 | if (length) |
798 | goto out; | |
1da177e4 | 799 | |
19439d05 | 800 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
801 | |
802 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 803 | "%x %x %x %x %u %x", |
f1c6381a | 804 | avd.allowed, 0xffffffff, |
1da177e4 | 805 | avd.auditallow, avd.auditdeny, |
8a6f83af | 806 | avd.seqno, avd.flags); |
1da177e4 | 807 | out: |
b77a493b | 808 | kfree(tcon); |
1da177e4 LT |
809 | kfree(scon); |
810 | return length; | |
811 | } | |
812 | ||
1872981b | 813 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 814 | { |
b77a493b | 815 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 816 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
817 | u32 ssid, tsid, newsid; |
818 | u16 tclass; | |
819 | ssize_t length; | |
b77a493b | 820 | char *newcon = NULL; |
1da177e4 | 821 | u32 len; |
f50a3ec9 | 822 | int nargs; |
1da177e4 | 823 | |
be0554c9 SS |
824 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
825 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, | |
826 | NULL); | |
1da177e4 | 827 | if (length) |
b77a493b | 828 | goto out; |
1da177e4 LT |
829 | |
830 | length = -ENOMEM; | |
c1a7368a | 831 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 832 | if (!scon) |
b77a493b | 833 | goto out; |
1da177e4 | 834 | |
b77a493b | 835 | length = -ENOMEM; |
c1a7368a | 836 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
837 | if (!tcon) |
838 | goto out; | |
1da177e4 | 839 | |
f50a3ec9 KK |
840 | length = -ENOMEM; |
841 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
842 | if (!namebuf) | |
843 | goto out; | |
844 | ||
1da177e4 | 845 | length = -EINVAL; |
f50a3ec9 KK |
846 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
847 | if (nargs < 3 || nargs > 4) | |
b77a493b | 848 | goto out; |
0f7e4c33 KK |
849 | if (nargs == 4) { |
850 | /* | |
851 | * If and when the name of new object to be queried contains | |
852 | * either whitespace or multibyte characters, they shall be | |
853 | * encoded based on the percentage-encoding rule. | |
854 | * If not encoded, the sscanf logic picks up only left-half | |
855 | * of the supplied name; splitted by a whitespace unexpectedly. | |
856 | */ | |
857 | char *r, *w; | |
858 | int c1, c2; | |
859 | ||
860 | r = w = namebuf; | |
861 | do { | |
862 | c1 = *r++; | |
863 | if (c1 == '+') | |
864 | c1 = ' '; | |
865 | else if (c1 == '%') { | |
af7ff2c2 AS |
866 | c1 = hex_to_bin(*r++); |
867 | if (c1 < 0) | |
0f7e4c33 | 868 | goto out; |
af7ff2c2 AS |
869 | c2 = hex_to_bin(*r++); |
870 | if (c2 < 0) | |
0f7e4c33 KK |
871 | goto out; |
872 | c1 = (c1 << 4) | c2; | |
873 | } | |
874 | *w++ = c1; | |
875 | } while (c1 != '\0'); | |
876 | ||
f50a3ec9 | 877 | objname = namebuf; |
0f7e4c33 | 878 | } |
1da177e4 | 879 | |
44be2f65 | 880 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
881 | if (length) |
882 | goto out; | |
883 | ||
44be2f65 | 884 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
885 | if (length) |
886 | goto out; | |
1da177e4 | 887 | |
f50a3ec9 KK |
888 | length = security_transition_sid_user(ssid, tsid, tclass, |
889 | objname, &newsid); | |
b77a493b EP |
890 | if (length) |
891 | goto out; | |
1da177e4 LT |
892 | |
893 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
894 | if (length) |
895 | goto out; | |
1da177e4 | 896 | |
b77a493b | 897 | length = -ERANGE; |
1da177e4 | 898 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
899 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
900 | "payload max\n", __func__, len); | |
b77a493b | 901 | goto out; |
1da177e4 LT |
902 | } |
903 | ||
904 | memcpy(buf, newcon, len); | |
905 | length = len; | |
b77a493b | 906 | out: |
1da177e4 | 907 | kfree(newcon); |
f50a3ec9 | 908 | kfree(namebuf); |
1da177e4 | 909 | kfree(tcon); |
1da177e4 LT |
910 | kfree(scon); |
911 | return length; | |
912 | } | |
913 | ||
1872981b | 914 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 915 | { |
b77a493b | 916 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
917 | u32 ssid, tsid, newsid; |
918 | u16 tclass; | |
919 | ssize_t length; | |
b77a493b | 920 | char *newcon = NULL; |
1da177e4 LT |
921 | u32 len; |
922 | ||
be0554c9 SS |
923 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
924 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, | |
925 | NULL); | |
1da177e4 | 926 | if (length) |
b77a493b | 927 | goto out; |
1da177e4 LT |
928 | |
929 | length = -ENOMEM; | |
c1a7368a | 930 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 931 | if (!scon) |
b77a493b | 932 | goto out; |
1da177e4 | 933 | |
b77a493b | 934 | length = -ENOMEM; |
c1a7368a | 935 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
936 | if (!tcon) |
937 | goto out; | |
1da177e4 LT |
938 | |
939 | length = -EINVAL; | |
940 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 941 | goto out; |
1da177e4 | 942 | |
44be2f65 | 943 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
944 | if (length) |
945 | goto out; | |
946 | ||
44be2f65 | 947 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
948 | if (length) |
949 | goto out; | |
1da177e4 LT |
950 | |
951 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
952 | if (length) |
953 | goto out; | |
1da177e4 LT |
954 | |
955 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
956 | if (length) |
957 | goto out; | |
1da177e4 | 958 | |
b77a493b EP |
959 | length = -ERANGE; |
960 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
961 | goto out; | |
1da177e4 LT |
962 | |
963 | memcpy(buf, newcon, len); | |
964 | length = len; | |
b77a493b | 965 | out: |
1da177e4 | 966 | kfree(newcon); |
1da177e4 | 967 | kfree(tcon); |
1da177e4 LT |
968 | kfree(scon); |
969 | return length; | |
970 | } | |
971 | ||
1872981b | 972 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 973 | { |
b77a493b EP |
974 | char *con = NULL, *user = NULL, *ptr; |
975 | u32 sid, *sids = NULL; | |
1da177e4 LT |
976 | ssize_t length; |
977 | char *newcon; | |
978 | int i, rc; | |
979 | u32 len, nsids; | |
980 | ||
be0554c9 SS |
981 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
982 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, | |
983 | NULL); | |
1da177e4 | 984 | if (length) |
6eab04a8 | 985 | goto out; |
1da177e4 LT |
986 | |
987 | length = -ENOMEM; | |
c1a7368a | 988 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 989 | if (!con) |
6eab04a8 | 990 | goto out; |
1da177e4 | 991 | |
b77a493b | 992 | length = -ENOMEM; |
c1a7368a | 993 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
994 | if (!user) |
995 | goto out; | |
1da177e4 LT |
996 | |
997 | length = -EINVAL; | |
998 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 999 | goto out; |
1da177e4 | 1000 | |
44be2f65 | 1001 | length = security_context_str_to_sid(con, &sid, GFP_KERNEL); |
b77a493b EP |
1002 | if (length) |
1003 | goto out; | |
1da177e4 LT |
1004 | |
1005 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
1006 | if (length) |
1007 | goto out; | |
1da177e4 LT |
1008 | |
1009 | length = sprintf(buf, "%u", nsids) + 1; | |
1010 | ptr = buf + length; | |
1011 | for (i = 0; i < nsids; i++) { | |
1012 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
1013 | if (rc) { | |
1014 | length = rc; | |
b77a493b | 1015 | goto out; |
1da177e4 LT |
1016 | } |
1017 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1018 | kfree(newcon); | |
1019 | length = -ERANGE; | |
b77a493b | 1020 | goto out; |
1da177e4 LT |
1021 | } |
1022 | memcpy(ptr, newcon, len); | |
1023 | kfree(newcon); | |
1024 | ptr += len; | |
1025 | length += len; | |
1026 | } | |
b77a493b | 1027 | out: |
1da177e4 | 1028 | kfree(sids); |
1da177e4 | 1029 | kfree(user); |
1da177e4 LT |
1030 | kfree(con); |
1031 | return length; | |
1032 | } | |
1033 | ||
1872981b | 1034 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1035 | { |
b77a493b | 1036 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1037 | u32 ssid, tsid, newsid; |
1038 | u16 tclass; | |
1039 | ssize_t length; | |
b77a493b | 1040 | char *newcon = NULL; |
1da177e4 LT |
1041 | u32 len; |
1042 | ||
be0554c9 SS |
1043 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1044 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, | |
1045 | NULL); | |
1da177e4 | 1046 | if (length) |
b77a493b | 1047 | goto out; |
1da177e4 LT |
1048 | |
1049 | length = -ENOMEM; | |
c1a7368a | 1050 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1051 | if (!scon) |
6eab04a8 | 1052 | goto out; |
1da177e4 | 1053 | |
b77a493b | 1054 | length = -ENOMEM; |
c1a7368a | 1055 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1056 | if (!tcon) |
1057 | goto out; | |
1da177e4 LT |
1058 | |
1059 | length = -EINVAL; | |
1060 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1061 | goto out; |
1da177e4 | 1062 | |
44be2f65 | 1063 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1064 | if (length) |
1065 | goto out; | |
1066 | ||
44be2f65 | 1067 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1068 | if (length) |
1069 | goto out; | |
1da177e4 LT |
1070 | |
1071 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1072 | if (length) |
1073 | goto out; | |
1da177e4 LT |
1074 | |
1075 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1076 | if (length) |
1077 | goto out; | |
1da177e4 | 1078 | |
b77a493b | 1079 | length = -ERANGE; |
1da177e4 | 1080 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1081 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1082 | "payload max\n", __func__, len); | |
b77a493b | 1083 | goto out; |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | memcpy(buf, newcon, len); | |
1087 | length = len; | |
b77a493b | 1088 | out: |
1da177e4 | 1089 | kfree(newcon); |
1da177e4 | 1090 | kfree(tcon); |
1da177e4 LT |
1091 | kfree(scon); |
1092 | return length; | |
1093 | } | |
1094 | ||
1095 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1096 | { | |
1097 | struct inode *ret = new_inode(sb); | |
1098 | ||
1099 | if (ret) { | |
1100 | ret->i_mode = mode; | |
078cd827 | 1101 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1102 | } |
1103 | return ret; | |
1104 | } | |
1105 | ||
1da177e4 LT |
1106 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1107 | size_t count, loff_t *ppos) | |
1108 | { | |
1109 | char *page = NULL; | |
1110 | ssize_t length; | |
1da177e4 LT |
1111 | ssize_t ret; |
1112 | int cur_enforcing; | |
496ad9aa | 1113 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1114 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1115 | |
bb003079 | 1116 | mutex_lock(&sel_mutex); |
1da177e4 | 1117 | |
b77a493b EP |
1118 | ret = -EINVAL; |
1119 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1120 | goto out; |
1da177e4 | 1121 | |
b77a493b | 1122 | ret = -ENOMEM; |
1872981b | 1123 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1124 | if (!page) |
1da177e4 | 1125 | goto out; |
1da177e4 | 1126 | |
d313f948 | 1127 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1128 | if (cur_enforcing < 0) { |
1129 | ret = cur_enforcing; | |
1130 | goto out; | |
1131 | } | |
1da177e4 | 1132 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1133 | bool_pending_values[index]); |
68bdcf28 | 1134 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1135 | out: |
bb003079 | 1136 | mutex_unlock(&sel_mutex); |
b77a493b | 1137 | free_page((unsigned long)page); |
1da177e4 LT |
1138 | return ret; |
1139 | } | |
1140 | ||
1141 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1142 | size_t count, loff_t *ppos) | |
1143 | { | |
1144 | char *page = NULL; | |
d313f948 | 1145 | ssize_t length; |
1da177e4 | 1146 | int new_value; |
496ad9aa | 1147 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1148 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1149 | |
bb003079 | 1150 | mutex_lock(&sel_mutex); |
1da177e4 | 1151 | |
be0554c9 SS |
1152 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1153 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1154 | NULL); | |
1da177e4 LT |
1155 | if (length) |
1156 | goto out; | |
1157 | ||
b77a493b EP |
1158 | length = -EINVAL; |
1159 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1160 | goto out; |
d313f948 | 1161 | |
b77a493b EP |
1162 | length = -ENOMEM; |
1163 | if (count >= PAGE_SIZE) | |
1da177e4 | 1164 | goto out; |
d313f948 | 1165 | |
b77a493b EP |
1166 | /* No partial writes. */ |
1167 | length = -EINVAL; | |
1168 | if (*ppos != 0) | |
1da177e4 | 1169 | goto out; |
b77a493b | 1170 | |
8365a719 AV |
1171 | page = memdup_user_nul(buf, count); |
1172 | if (IS_ERR(page)) { | |
1173 | length = PTR_ERR(page); | |
1174 | page = NULL; | |
1da177e4 | 1175 | goto out; |
8365a719 | 1176 | } |
1da177e4 LT |
1177 | |
1178 | length = -EINVAL; | |
1179 | if (sscanf(page, "%d", &new_value) != 1) | |
1180 | goto out; | |
1181 | ||
1182 | if (new_value) | |
1183 | new_value = 1; | |
1184 | ||
d313f948 | 1185 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1186 | length = count; |
1187 | ||
1188 | out: | |
bb003079 | 1189 | mutex_unlock(&sel_mutex); |
8365a719 | 1190 | kfree(page); |
1da177e4 LT |
1191 | return length; |
1192 | } | |
1193 | ||
9c2e08c5 | 1194 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1195 | .read = sel_read_bool, |
1196 | .write = sel_write_bool, | |
57a62c23 | 1197 | .llseek = generic_file_llseek, |
1da177e4 LT |
1198 | }; |
1199 | ||
1200 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1201 | const char __user *buf, | |
1202 | size_t count, loff_t *ppos) | |
1203 | { | |
1204 | char *page = NULL; | |
d313f948 | 1205 | ssize_t length; |
1da177e4 LT |
1206 | int new_value; |
1207 | ||
bb003079 | 1208 | mutex_lock(&sel_mutex); |
1da177e4 | 1209 | |
be0554c9 SS |
1210 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1211 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1212 | NULL); | |
1da177e4 LT |
1213 | if (length) |
1214 | goto out; | |
1215 | ||
b77a493b EP |
1216 | length = -ENOMEM; |
1217 | if (count >= PAGE_SIZE) | |
1da177e4 | 1218 | goto out; |
b77a493b EP |
1219 | |
1220 | /* No partial writes. */ | |
1221 | length = -EINVAL; | |
1222 | if (*ppos != 0) | |
1da177e4 | 1223 | goto out; |
b77a493b | 1224 | |
8365a719 AV |
1225 | page = memdup_user_nul(buf, count); |
1226 | if (IS_ERR(page)) { | |
1227 | length = PTR_ERR(page); | |
1228 | page = NULL; | |
1da177e4 | 1229 | goto out; |
8365a719 | 1230 | } |
1da177e4 LT |
1231 | |
1232 | length = -EINVAL; | |
1233 | if (sscanf(page, "%d", &new_value) != 1) | |
1234 | goto out; | |
1235 | ||
b77a493b | 1236 | length = 0; |
1872981b | 1237 | if (new_value && bool_pending_values) |
b77a493b | 1238 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1239 | |
b77a493b EP |
1240 | if (!length) |
1241 | length = count; | |
1da177e4 LT |
1242 | |
1243 | out: | |
bb003079 | 1244 | mutex_unlock(&sel_mutex); |
8365a719 | 1245 | kfree(page); |
1da177e4 LT |
1246 | return length; |
1247 | } | |
1248 | ||
9c2e08c5 | 1249 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1250 | .write = sel_commit_bools_write, |
57a62c23 | 1251 | .llseek = generic_file_llseek, |
1da177e4 LT |
1252 | }; |
1253 | ||
0c92d7c7 | 1254 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1255 | { |
ad52184b AV |
1256 | d_genocide(de); |
1257 | shrink_dcache_parent(de); | |
1da177e4 LT |
1258 | } |
1259 | ||
1260 | #define BOOL_DIR_NAME "booleans" | |
1261 | ||
1262 | static int sel_make_bools(void) | |
1263 | { | |
b77a493b | 1264 | int i, ret; |
1da177e4 LT |
1265 | ssize_t len; |
1266 | struct dentry *dentry = NULL; | |
1267 | struct dentry *dir = bool_dir; | |
1268 | struct inode *inode = NULL; | |
1269 | struct inode_security_struct *isec; | |
1270 | char **names = NULL, *page; | |
1271 | int num; | |
1272 | int *values = NULL; | |
1273 | u32 sid; | |
1274 | ||
1275 | /* remove any existing files */ | |
8007f102 XF |
1276 | for (i = 0; i < bool_num; i++) |
1277 | kfree(bool_pending_names[i]); | |
d313f948 | 1278 | kfree(bool_pending_names); |
9a5f04bf | 1279 | kfree(bool_pending_values); |
154c50ca | 1280 | bool_num = 0; |
d313f948 | 1281 | bool_pending_names = NULL; |
20c19e41 | 1282 | bool_pending_values = NULL; |
1da177e4 | 1283 | |
0c92d7c7 | 1284 | sel_remove_entries(dir); |
1da177e4 | 1285 | |
b77a493b | 1286 | ret = -ENOMEM; |
1872981b EP |
1287 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1288 | if (!page) | |
b77a493b | 1289 | goto out; |
1da177e4 LT |
1290 | |
1291 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1292 | if (ret) |
1da177e4 LT |
1293 | goto out; |
1294 | ||
1295 | for (i = 0; i < num; i++) { | |
b77a493b | 1296 | ret = -ENOMEM; |
1da177e4 | 1297 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1298 | if (!dentry) |
1299 | goto out; | |
1300 | ||
1301 | ret = -ENOMEM; | |
1da177e4 | 1302 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1303 | if (!inode) |
1304 | goto out; | |
1da177e4 | 1305 | |
b77a493b | 1306 | ret = -ENAMETOOLONG; |
cc1dad71 | 1307 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1308 | if (len >= PAGE_SIZE) |
1309 | goto out; | |
1310 | ||
1872981b EP |
1311 | isec = (struct inode_security_struct *)inode->i_security; |
1312 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
4262fb51 | 1313 | if (ret) { |
900fde06 GT |
1314 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1315 | page); | |
1316 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1317 | } |
1318 | ||
1da177e4 | 1319 | isec->sid = sid; |
42059112 | 1320 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1321 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1322 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1323 | d_add(dentry, inode); |
1324 | } | |
1325 | bool_num = num; | |
d313f948 | 1326 | bool_pending_names = names; |
1da177e4 | 1327 | bool_pending_values = values; |
b77a493b EP |
1328 | |
1329 | free_page((unsigned long)page); | |
1330 | return 0; | |
1da177e4 LT |
1331 | out: |
1332 | free_page((unsigned long)page); | |
b77a493b | 1333 | |
1da177e4 | 1334 | if (names) { |
9a5f04bf JJ |
1335 | for (i = 0; i < num; i++) |
1336 | kfree(names[i]); | |
1da177e4 LT |
1337 | kfree(names); |
1338 | } | |
20c19e41 | 1339 | kfree(values); |
0c92d7c7 | 1340 | sel_remove_entries(dir); |
b77a493b EP |
1341 | |
1342 | return ret; | |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | #define NULL_FILE_NAME "null" | |
1346 | ||
765927b2 | 1347 | struct path selinux_null; |
1da177e4 LT |
1348 | |
1349 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1350 | size_t count, loff_t *ppos) | |
1351 | { | |
1352 | char tmpbuf[TMPBUFLEN]; | |
1353 | ssize_t length; | |
1354 | ||
1355 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1356 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1357 | } | |
1358 | ||
1872981b EP |
1359 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1360 | const char __user *buf, | |
1da177e4 LT |
1361 | size_t count, loff_t *ppos) |
1362 | ||
1363 | { | |
8365a719 | 1364 | char *page; |
1da177e4 | 1365 | ssize_t ret; |
309c5fad | 1366 | unsigned int new_value; |
1da177e4 | 1367 | |
be0554c9 SS |
1368 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1369 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, | |
1370 | NULL); | |
b77a493b | 1371 | if (ret) |
8365a719 | 1372 | return ret; |
1da177e4 | 1373 | |
b77a493b | 1374 | if (count >= PAGE_SIZE) |
8365a719 | 1375 | return -ENOMEM; |
1da177e4 | 1376 | |
b77a493b | 1377 | /* No partial writes. */ |
b77a493b | 1378 | if (*ppos != 0) |
8365a719 | 1379 | return -EINVAL; |
1da177e4 | 1380 | |
8365a719 AV |
1381 | page = memdup_user_nul(buf, count); |
1382 | if (IS_ERR(page)) | |
1383 | return PTR_ERR(page); | |
1da177e4 | 1384 | |
b77a493b EP |
1385 | ret = -EINVAL; |
1386 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1387 | goto out; |
1da177e4 | 1388 | |
b77a493b EP |
1389 | avc_cache_threshold = new_value; |
1390 | ||
1da177e4 | 1391 | ret = count; |
1da177e4 | 1392 | out: |
8365a719 | 1393 | kfree(page); |
1da177e4 LT |
1394 | return ret; |
1395 | } | |
1396 | ||
1397 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1398 | size_t count, loff_t *ppos) | |
1399 | { | |
1400 | char *page; | |
b77a493b | 1401 | ssize_t length; |
1da177e4 LT |
1402 | |
1403 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1404 | if (!page) |
1405 | return -ENOMEM; | |
1406 | ||
1407 | length = avc_get_hash_stats(page); | |
1408 | if (length >= 0) | |
1409 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1410 | free_page((unsigned long)page); |
b77a493b EP |
1411 | |
1412 | return length; | |
1da177e4 LT |
1413 | } |
1414 | ||
9c2e08c5 | 1415 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1416 | .read = sel_read_avc_cache_threshold, |
1417 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1418 | .llseek = generic_file_llseek, |
1da177e4 LT |
1419 | }; |
1420 | ||
9c2e08c5 | 1421 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1422 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1423 | .llseek = generic_file_llseek, |
1da177e4 LT |
1424 | }; |
1425 | ||
1426 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1427 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1428 | { | |
1429 | int cpu; | |
1430 | ||
4f4b6c1a | 1431 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1432 | if (!cpu_possible(cpu)) |
1433 | continue; | |
1434 | *idx = cpu + 1; | |
1435 | return &per_cpu(avc_cache_stats, cpu); | |
1436 | } | |
1437 | return NULL; | |
1438 | } | |
1439 | ||
1440 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1441 | { | |
1442 | loff_t n = *pos - 1; | |
1443 | ||
1444 | if (*pos == 0) | |
1445 | return SEQ_START_TOKEN; | |
1446 | ||
1447 | return sel_avc_get_stat_idx(&n); | |
1448 | } | |
1449 | ||
1450 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1451 | { | |
1452 | return sel_avc_get_stat_idx(pos); | |
1453 | } | |
1454 | ||
1455 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1456 | { | |
1457 | struct avc_cache_stats *st = v; | |
1458 | ||
1459 | if (v == SEQ_START_TOKEN) | |
1460 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1461 | "frees\n"); | |
257313b2 LT |
1462 | else { |
1463 | unsigned int lookups = st->lookups; | |
1464 | unsigned int misses = st->misses; | |
1465 | unsigned int hits = lookups - misses; | |
1466 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1467 | hits, misses, st->allocations, | |
1da177e4 | 1468 | st->reclaims, st->frees); |
257313b2 | 1469 | } |
1da177e4 LT |
1470 | return 0; |
1471 | } | |
1472 | ||
1473 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1474 | { } | |
1475 | ||
1996a109 | 1476 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1477 | .start = sel_avc_stats_seq_start, |
1478 | .next = sel_avc_stats_seq_next, | |
1479 | .show = sel_avc_stats_seq_show, | |
1480 | .stop = sel_avc_stats_seq_stop, | |
1481 | }; | |
1482 | ||
1483 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1484 | { | |
1485 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1486 | } | |
1487 | ||
9c2e08c5 | 1488 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1489 | .open = sel_open_avc_cache_stats, |
1490 | .read = seq_read, | |
1491 | .llseek = seq_lseek, | |
1492 | .release = seq_release, | |
1493 | }; | |
1494 | #endif | |
1495 | ||
1496 | static int sel_make_avc_files(struct dentry *dir) | |
1497 | { | |
b77a493b | 1498 | int i; |
1da177e4 LT |
1499 | static struct tree_descr files[] = { |
1500 | { "cache_threshold", | |
1501 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1502 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1503 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1504 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1505 | #endif | |
1506 | }; | |
1507 | ||
6e20a64a | 1508 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1509 | struct inode *inode; |
1510 | struct dentry *dentry; | |
1511 | ||
1512 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1513 | if (!dentry) |
1514 | return -ENOMEM; | |
1da177e4 LT |
1515 | |
1516 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1517 | if (!inode) |
1518 | return -ENOMEM; | |
1519 | ||
1da177e4 | 1520 | inode->i_fop = files[i].ops; |
6174eafc | 1521 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1522 | d_add(dentry, inode); |
1523 | } | |
b77a493b EP |
1524 | |
1525 | return 0; | |
1da177e4 LT |
1526 | } |
1527 | ||
1872981b | 1528 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1529 | size_t count, loff_t *ppos) |
1530 | { | |
f0ee2e46 JC |
1531 | char *con; |
1532 | u32 sid, len; | |
1533 | ssize_t ret; | |
1534 | ||
496ad9aa | 1535 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1536 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1537 | if (ret) |
f0ee2e46 JC |
1538 | return ret; |
1539 | ||
1540 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1541 | kfree(con); | |
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | static const struct file_operations sel_initcon_ops = { | |
1546 | .read = sel_read_initcon, | |
57a62c23 | 1547 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1548 | }; |
1549 | ||
1550 | static int sel_make_initcon_files(struct dentry *dir) | |
1551 | { | |
b77a493b | 1552 | int i; |
f0ee2e46 JC |
1553 | |
1554 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1555 | struct inode *inode; | |
1556 | struct dentry *dentry; | |
1557 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1558 | if (!dentry) |
1559 | return -ENOMEM; | |
f0ee2e46 JC |
1560 | |
1561 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1562 | if (!inode) |
1563 | return -ENOMEM; | |
1564 | ||
f0ee2e46 JC |
1565 | inode->i_fop = &sel_initcon_ops; |
1566 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1567 | d_add(dentry, inode); | |
1568 | } | |
b77a493b EP |
1569 | |
1570 | return 0; | |
f0ee2e46 JC |
1571 | } |
1572 | ||
e47c8fc5 CP |
1573 | static inline unsigned long sel_class_to_ino(u16 class) |
1574 | { | |
1575 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1576 | } | |
1577 | ||
1578 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1579 | { | |
92ae9e82 | 1580 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1581 | } |
1582 | ||
1583 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1584 | { | |
1585 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1586 | } | |
1587 | ||
1588 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1589 | { | |
1590 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1591 | } | |
1592 | ||
1872981b | 1593 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1594 | size_t count, loff_t *ppos) |
1595 | { | |
496ad9aa | 1596 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1597 | char res[TMPBUFLEN]; |
1598 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1599 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1600 | } |
1601 | ||
1602 | static const struct file_operations sel_class_ops = { | |
1603 | .read = sel_read_class, | |
57a62c23 | 1604 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1605 | }; |
1606 | ||
1872981b | 1607 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1608 | size_t count, loff_t *ppos) |
1609 | { | |
496ad9aa | 1610 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1611 | char res[TMPBUFLEN]; |
1612 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1613 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1614 | } |
1615 | ||
1616 | static const struct file_operations sel_perm_ops = { | |
1617 | .read = sel_read_perm, | |
57a62c23 | 1618 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1619 | }; |
1620 | ||
3bb56b25 PM |
1621 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1622 | size_t count, loff_t *ppos) | |
1623 | { | |
1624 | int value; | |
1625 | char tmpbuf[TMPBUFLEN]; | |
1626 | ssize_t length; | |
496ad9aa | 1627 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1628 | |
1629 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1630 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1631 | ||
1632 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1633 | } | |
1634 | ||
1635 | static const struct file_operations sel_policycap_ops = { | |
1636 | .read = sel_read_policycap, | |
57a62c23 | 1637 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1638 | }; |
1639 | ||
e47c8fc5 CP |
1640 | static int sel_make_perm_files(char *objclass, int classvalue, |
1641 | struct dentry *dir) | |
1642 | { | |
b77a493b | 1643 | int i, rc, nperms; |
e47c8fc5 CP |
1644 | char **perms; |
1645 | ||
1646 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1647 | if (rc) | |
b77a493b | 1648 | return rc; |
e47c8fc5 CP |
1649 | |
1650 | for (i = 0; i < nperms; i++) { | |
1651 | struct inode *inode; | |
1652 | struct dentry *dentry; | |
1653 | ||
b77a493b | 1654 | rc = -ENOMEM; |
e47c8fc5 | 1655 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1656 | if (!dentry) |
1657 | goto out; | |
e47c8fc5 | 1658 | |
b77a493b | 1659 | rc = -ENOMEM; |
e47c8fc5 | 1660 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1661 | if (!inode) |
1662 | goto out; | |
1663 | ||
e47c8fc5 CP |
1664 | inode->i_fop = &sel_perm_ops; |
1665 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1666 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1667 | d_add(dentry, inode); |
1668 | } | |
b77a493b EP |
1669 | rc = 0; |
1670 | out: | |
e47c8fc5 CP |
1671 | for (i = 0; i < nperms; i++) |
1672 | kfree(perms[i]); | |
1673 | kfree(perms); | |
e47c8fc5 CP |
1674 | return rc; |
1675 | } | |
1676 | ||
1677 | static int sel_make_class_dir_entries(char *classname, int index, | |
1678 | struct dentry *dir) | |
1679 | { | |
1680 | struct dentry *dentry = NULL; | |
1681 | struct inode *inode = NULL; | |
1682 | int rc; | |
1683 | ||
1684 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1685 | if (!dentry) |
1686 | return -ENOMEM; | |
e47c8fc5 CP |
1687 | |
1688 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1689 | if (!inode) |
1690 | return -ENOMEM; | |
e47c8fc5 CP |
1691 | |
1692 | inode->i_fop = &sel_class_ops; | |
1693 | inode->i_ino = sel_class_to_ino(index); | |
1694 | d_add(dentry, inode); | |
1695 | ||
a1c2aa1e AV |
1696 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1697 | if (IS_ERR(dentry)) | |
1698 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1699 | |
1700 | rc = sel_make_perm_files(classname, index, dentry); | |
1701 | ||
e47c8fc5 CP |
1702 | return rc; |
1703 | } | |
1704 | ||
e47c8fc5 CP |
1705 | static int sel_make_classes(void) |
1706 | { | |
b77a493b | 1707 | int rc, nclasses, i; |
e47c8fc5 CP |
1708 | char **classes; |
1709 | ||
1710 | /* delete any existing entries */ | |
ad52184b | 1711 | sel_remove_entries(class_dir); |
e47c8fc5 CP |
1712 | |
1713 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1714 | if (rc) |
1715 | return rc; | |
e47c8fc5 CP |
1716 | |
1717 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1718 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1719 | |
1720 | for (i = 0; i < nclasses; i++) { | |
1721 | struct dentry *class_name_dir; | |
1722 | ||
a1c2aa1e | 1723 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1724 | &last_class_ino); |
a1c2aa1e AV |
1725 | if (IS_ERR(class_name_dir)) { |
1726 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1727 | goto out; |
a1c2aa1e | 1728 | } |
e47c8fc5 CP |
1729 | |
1730 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1731 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1732 | class_name_dir); |
1733 | if (rc) | |
b77a493b | 1734 | goto out; |
e47c8fc5 | 1735 | } |
b77a493b EP |
1736 | rc = 0; |
1737 | out: | |
e47c8fc5 CP |
1738 | for (i = 0; i < nclasses; i++) |
1739 | kfree(classes[i]); | |
1740 | kfree(classes); | |
e47c8fc5 CP |
1741 | return rc; |
1742 | } | |
1743 | ||
3bb56b25 PM |
1744 | static int sel_make_policycap(void) |
1745 | { | |
1746 | unsigned int iter; | |
1747 | struct dentry *dentry = NULL; | |
1748 | struct inode *inode = NULL; | |
1749 | ||
1750 | sel_remove_entries(policycap_dir); | |
1751 | ||
1752 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1753 | if (iter < ARRAY_SIZE(policycap_names)) | |
1754 | dentry = d_alloc_name(policycap_dir, | |
1755 | policycap_names[iter]); | |
1756 | else | |
1757 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1758 | ||
1759 | if (dentry == NULL) | |
1760 | return -ENOMEM; | |
1761 | ||
1762 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1763 | if (inode == NULL) | |
1764 | return -ENOMEM; | |
1765 | ||
1766 | inode->i_fop = &sel_policycap_ops; | |
1767 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1768 | d_add(dentry, inode); | |
1769 | } | |
1770 | ||
1771 | return 0; | |
1772 | } | |
1773 | ||
a1c2aa1e | 1774 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1775 | unsigned long *ino) |
1da177e4 | 1776 | { |
a1c2aa1e | 1777 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1778 | struct inode *inode; |
1779 | ||
a1c2aa1e AV |
1780 | if (!dentry) |
1781 | return ERR_PTR(-ENOMEM); | |
1782 | ||
1783 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1784 | if (!inode) { | |
1785 | dput(dentry); | |
1786 | return ERR_PTR(-ENOMEM); | |
1787 | } | |
b77a493b | 1788 | |
1da177e4 LT |
1789 | inode->i_op = &simple_dir_inode_operations; |
1790 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1791 | inode->i_ino = ++(*ino); |
40e906f8 | 1792 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1793 | inc_nlink(inode); |
1da177e4 | 1794 | d_add(dentry, inode); |
edb20fb5 | 1795 | /* bump link count on parent directory, too */ |
ce0b16dd | 1796 | inc_nlink(d_inode(dir)); |
b77a493b | 1797 | |
a1c2aa1e | 1798 | return dentry; |
1da177e4 LT |
1799 | } |
1800 | ||
1872981b | 1801 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1802 | { |
1803 | int ret; | |
1804 | struct dentry *dentry; | |
a1c2aa1e | 1805 | struct inode *inode; |
1da177e4 LT |
1806 | struct inode_security_struct *isec; |
1807 | ||
1808 | static struct tree_descr selinux_files[] = { | |
1809 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1810 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1811 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1812 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1813 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1814 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1815 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1816 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1817 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1818 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1819 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1820 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1821 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1822 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1823 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1824 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1825 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1826 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1827 | S_IWUGO}, | |
1da177e4 LT |
1828 | /* last one */ {""} |
1829 | }; | |
1830 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1831 | if (ret) | |
161ce45a | 1832 | goto err; |
1da177e4 | 1833 | |
a1c2aa1e AV |
1834 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1835 | if (IS_ERR(bool_dir)) { | |
1836 | ret = PTR_ERR(bool_dir); | |
1837 | bool_dir = NULL; | |
161ce45a | 1838 | goto err; |
a1c2aa1e | 1839 | } |
1da177e4 | 1840 | |
b77a493b | 1841 | ret = -ENOMEM; |
1da177e4 | 1842 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1843 | if (!dentry) |
161ce45a | 1844 | goto err; |
1da177e4 | 1845 | |
b77a493b | 1846 | ret = -ENOMEM; |
1da177e4 | 1847 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1848 | if (!inode) |
161ce45a | 1849 | goto err; |
b77a493b | 1850 | |
6174eafc | 1851 | inode->i_ino = ++sel_last_ino; |
1872981b | 1852 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1853 | isec->sid = SECINITSID_DEVNULL; |
1854 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1855 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1856 | |
1857 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1858 | d_add(dentry, inode); | |
765927b2 | 1859 | selinux_null.dentry = dentry; |
1da177e4 | 1860 | |
a1c2aa1e AV |
1861 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1862 | if (IS_ERR(dentry)) { | |
1863 | ret = PTR_ERR(dentry); | |
161ce45a | 1864 | goto err; |
a1c2aa1e | 1865 | } |
1da177e4 LT |
1866 | |
1867 | ret = sel_make_avc_files(dentry); | |
1868 | if (ret) | |
161ce45a | 1869 | goto err; |
f0ee2e46 | 1870 | |
a1c2aa1e AV |
1871 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1872 | if (IS_ERR(dentry)) { | |
1873 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1874 | goto err; |
a1c2aa1e | 1875 | } |
f0ee2e46 JC |
1876 | |
1877 | ret = sel_make_initcon_files(dentry); | |
1878 | if (ret) | |
1879 | goto err; | |
1880 | ||
a1c2aa1e AV |
1881 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1882 | if (IS_ERR(class_dir)) { | |
1883 | ret = PTR_ERR(class_dir); | |
1884 | class_dir = NULL; | |
3bb56b25 | 1885 | goto err; |
a1c2aa1e | 1886 | } |
3bb56b25 | 1887 | |
a1c2aa1e AV |
1888 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1889 | if (IS_ERR(policycap_dir)) { | |
1890 | ret = PTR_ERR(policycap_dir); | |
1891 | policycap_dir = NULL; | |
3bb56b25 | 1892 | goto err; |
a1c2aa1e | 1893 | } |
b77a493b | 1894 | return 0; |
161ce45a | 1895 | err: |
744ba35e EP |
1896 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1897 | __func__); | |
b77a493b | 1898 | return ret; |
1da177e4 LT |
1899 | } |
1900 | ||
fc14f2fe AV |
1901 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1902 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1903 | { |
fc14f2fe | 1904 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1905 | } |
1906 | ||
1907 | static struct file_system_type sel_fs_type = { | |
1908 | .name = "selinuxfs", | |
fc14f2fe | 1909 | .mount = sel_mount, |
1da177e4 LT |
1910 | .kill_sb = kill_litter_super, |
1911 | }; | |
1912 | ||
1913 | struct vfsmount *selinuxfs_mount; | |
1914 | ||
1915 | static int __init init_sel_fs(void) | |
1916 | { | |
1917 | int err; | |
1918 | ||
1919 | if (!selinux_enabled) | |
1920 | return 0; | |
7a627e3b | 1921 | |
f9bb4882 EB |
1922 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
1923 | if (err) | |
1924 | return err; | |
7a627e3b | 1925 | |
1da177e4 | 1926 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 1927 | if (err) { |
f9bb4882 | 1928 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 1929 | return err; |
7a627e3b | 1930 | } |
b77a493b | 1931 | |
765927b2 | 1932 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1933 | if (IS_ERR(selinuxfs_mount)) { |
1934 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1935 | err = PTR_ERR(selinuxfs_mount); | |
1936 | selinuxfs_mount = NULL; | |
1da177e4 | 1937 | } |
b77a493b | 1938 | |
1da177e4 LT |
1939 | return err; |
1940 | } | |
1941 | ||
1942 | __initcall(init_sel_fs); | |
1943 | ||
1944 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1945 | void exit_sel_fs(void) | |
1946 | { | |
f9bb4882 | 1947 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
423e0ab0 | 1948 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1949 | unregister_filesystem(&sel_fs_type); |
1950 | } | |
1951 | #endif |