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Commit | Line | Data |
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1da177e4 LT |
1 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
2 | * | |
1872981b | 3 | * Added conditional policy language extensions |
1da177e4 | 4 | * |
82c21bfa | 5 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
3bb56b25 | 6 | * |
1872981b | 7 | * Added support for the policy capability bitmap |
3bb56b25 PM |
8 | * |
9 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
10 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
11 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
12 | * This program is free software; you can redistribute it and/or modify | |
1872981b | 13 | * it under the terms of the GNU General Public License as published by |
1da177e4 LT |
14 | * the Free Software Foundation, version 2. |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/fs.h> | |
bb003079 | 22 | #include <linux/mutex.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/percpu.h> | |
af601e46 | 29 | #include <linux/audit.h> |
f5269710 | 30 | #include <linux/uaccess.h> |
7a627e3b | 31 | #include <linux/kobject.h> |
0f7e4c33 | 32 | #include <linux/ctype.h> |
1da177e4 LT |
33 | |
34 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
35 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
36 | ||
37 | #include "flask.h" | |
38 | #include "avc.h" | |
39 | #include "avc_ss.h" | |
40 | #include "security.h" | |
41 | #include "objsec.h" | |
42 | #include "conditional.h" | |
43 | ||
44 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; | |
45 | ||
46 | static int __init checkreqprot_setup(char *str) | |
47 | { | |
f5269710 | 48 | unsigned long checkreqprot; |
29707b20 | 49 | if (!kstrtoul(str, 0, &checkreqprot)) |
f5269710 | 50 | selinux_checkreqprot = checkreqprot ? 1 : 0; |
1da177e4 LT |
51 | return 1; |
52 | } | |
53 | __setup("checkreqprot=", checkreqprot_setup); | |
54 | ||
bb003079 | 55 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
56 | |
57 | /* global data for booleans */ | |
1872981b EP |
58 | static struct dentry *bool_dir; |
59 | static int bool_num; | |
d313f948 | 60 | static char **bool_pending_names; |
1872981b | 61 | static int *bool_pending_values; |
1da177e4 | 62 | |
e47c8fc5 | 63 | /* global data for classes */ |
1872981b | 64 | static struct dentry *class_dir; |
e47c8fc5 CP |
65 | static unsigned long last_class_ino; |
66 | ||
cee74f47 EP |
67 | static char policy_opened; |
68 | ||
3bb56b25 | 69 | /* global data for policy capabilities */ |
1872981b | 70 | static struct dentry *policycap_dir; |
3bb56b25 | 71 | |
1da177e4 LT |
72 | enum sel_inos { |
73 | SEL_ROOT_INO = 2, | |
74 | SEL_LOAD, /* load policy */ | |
75 | SEL_ENFORCE, /* get or set enforcing status */ | |
76 | SEL_CONTEXT, /* validate context */ | |
77 | SEL_ACCESS, /* compute access decision */ | |
78 | SEL_CREATE, /* compute create labeling decision */ | |
79 | SEL_RELABEL, /* compute relabeling decision */ | |
80 | SEL_USER, /* compute reachable user contexts */ | |
81 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
82 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
83 | SEL_MLS, /* return if MLS policy is enabled */ | |
84 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
85 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
86 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 87 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
88 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
89 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 90 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 91 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 92 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 93 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
94 | }; |
95 | ||
6174eafc JC |
96 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
97 | ||
3bb56b25 PM |
98 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
99 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
100 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
101 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
102 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 103 | |
1da177e4 LT |
104 | #define TMPBUFLEN 12 |
105 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
106 | size_t count, loff_t *ppos) | |
107 | { | |
108 | char tmpbuf[TMPBUFLEN]; | |
109 | ssize_t length; | |
110 | ||
111 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
112 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
113 | } | |
114 | ||
115 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 116 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
117 | size_t count, loff_t *ppos) |
118 | ||
119 | { | |
b77a493b | 120 | char *page = NULL; |
1da177e4 LT |
121 | ssize_t length; |
122 | int new_value; | |
123 | ||
bfd51626 | 124 | if (count >= PAGE_SIZE) |
8365a719 | 125 | return -ENOMEM; |
b77a493b EP |
126 | |
127 | /* No partial writes. */ | |
b77a493b | 128 | if (*ppos != 0) |
8365a719 | 129 | return -EINVAL; |
b77a493b | 130 | |
8365a719 AV |
131 | page = memdup_user_nul(buf, count); |
132 | if (IS_ERR(page)) | |
133 | return PTR_ERR(page); | |
1da177e4 LT |
134 | |
135 | length = -EINVAL; | |
136 | if (sscanf(page, "%d", &new_value) != 1) | |
137 | goto out; | |
138 | ||
ea49d10e SS |
139 | new_value = !!new_value; |
140 | ||
1da177e4 | 141 | if (new_value != selinux_enforcing) { |
be0554c9 SS |
142 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
143 | SECCLASS_SECURITY, SECURITY__SETENFORCE, | |
144 | NULL); | |
1da177e4 LT |
145 | if (length) |
146 | goto out; | |
af601e46 | 147 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
148 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
149 | new_value, selinux_enforcing, | |
581abc09 | 150 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 151 | audit_get_sessionid(current)); |
1da177e4 LT |
152 | selinux_enforcing = new_value; |
153 | if (selinux_enforcing) | |
154 | avc_ss_reset(0); | |
155 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 156 | selinux_status_update_setenforce(selinux_enforcing); |
8f408ab6 DJ |
157 | if (!selinux_enforcing) |
158 | call_lsm_notifier(LSM_POLICY_CHANGE, NULL); | |
1da177e4 LT |
159 | } |
160 | length = count; | |
161 | out: | |
8365a719 | 162 | kfree(page); |
1da177e4 LT |
163 | return length; |
164 | } | |
165 | #else | |
166 | #define sel_write_enforce NULL | |
167 | #endif | |
168 | ||
9c2e08c5 | 169 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
170 | .read = sel_read_enforce, |
171 | .write = sel_write_enforce, | |
57a62c23 | 172 | .llseek = generic_file_llseek, |
1da177e4 LT |
173 | }; |
174 | ||
3f12070e EP |
175 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
176 | size_t count, loff_t *ppos) | |
177 | { | |
178 | char tmpbuf[TMPBUFLEN]; | |
179 | ssize_t length; | |
496ad9aa | 180 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
181 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
182 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
183 | ||
184 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
185 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
186 | } | |
187 | ||
188 | static const struct file_operations sel_handle_unknown_ops = { | |
189 | .read = sel_read_handle_unknown, | |
57a62c23 | 190 | .llseek = generic_file_llseek, |
3f12070e EP |
191 | }; |
192 | ||
11904167 KK |
193 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
194 | { | |
195 | struct page *status = selinux_kernel_status_page(); | |
196 | ||
197 | if (!status) | |
198 | return -ENOMEM; | |
199 | ||
200 | filp->private_data = status; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
206 | size_t count, loff_t *ppos) | |
207 | { | |
208 | struct page *status = filp->private_data; | |
209 | ||
210 | BUG_ON(!status); | |
211 | ||
212 | return simple_read_from_buffer(buf, count, ppos, | |
213 | page_address(status), | |
214 | sizeof(struct selinux_kernel_status)); | |
215 | } | |
216 | ||
217 | static int sel_mmap_handle_status(struct file *filp, | |
218 | struct vm_area_struct *vma) | |
219 | { | |
220 | struct page *status = filp->private_data; | |
221 | unsigned long size = vma->vm_end - vma->vm_start; | |
222 | ||
223 | BUG_ON(!status); | |
224 | ||
225 | /* only allows one page from the head */ | |
226 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
227 | return -EIO; | |
228 | /* disallow writable mapping */ | |
229 | if (vma->vm_flags & VM_WRITE) | |
230 | return -EPERM; | |
231 | /* disallow mprotect() turns it into writable */ | |
232 | vma->vm_flags &= ~VM_MAYWRITE; | |
233 | ||
234 | return remap_pfn_range(vma, vma->vm_start, | |
235 | page_to_pfn(status), | |
236 | size, vma->vm_page_prot); | |
237 | } | |
238 | ||
239 | static const struct file_operations sel_handle_status_ops = { | |
240 | .open = sel_open_handle_status, | |
241 | .read = sel_read_handle_status, | |
242 | .mmap = sel_mmap_handle_status, | |
243 | .llseek = generic_file_llseek, | |
244 | }; | |
245 | ||
1da177e4 | 246 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 247 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
248 | size_t count, loff_t *ppos) |
249 | ||
250 | { | |
8365a719 | 251 | char *page; |
1da177e4 LT |
252 | ssize_t length; |
253 | int new_value; | |
1da177e4 | 254 | |
bfd51626 | 255 | if (count >= PAGE_SIZE) |
8365a719 | 256 | return -ENOMEM; |
b77a493b EP |
257 | |
258 | /* No partial writes. */ | |
b77a493b | 259 | if (*ppos != 0) |
8365a719 | 260 | return -EINVAL; |
b77a493b | 261 | |
8365a719 AV |
262 | page = memdup_user_nul(buf, count); |
263 | if (IS_ERR(page)) | |
264 | return PTR_ERR(page); | |
1da177e4 LT |
265 | |
266 | length = -EINVAL; | |
267 | if (sscanf(page, "%d", &new_value) != 1) | |
268 | goto out; | |
269 | ||
270 | if (new_value) { | |
271 | length = selinux_disable(); | |
b77a493b | 272 | if (length) |
1da177e4 | 273 | goto out; |
af601e46 | 274 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b | 275 | "selinux=0 auid=%u ses=%u", |
581abc09 | 276 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 277 | audit_get_sessionid(current)); |
1da177e4 LT |
278 | } |
279 | ||
280 | length = count; | |
281 | out: | |
8365a719 | 282 | kfree(page); |
1da177e4 LT |
283 | return length; |
284 | } | |
285 | #else | |
286 | #define sel_write_disable NULL | |
287 | #endif | |
288 | ||
9c2e08c5 | 289 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 290 | .write = sel_write_disable, |
57a62c23 | 291 | .llseek = generic_file_llseek, |
1da177e4 LT |
292 | }; |
293 | ||
294 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 295 | size_t count, loff_t *ppos) |
1da177e4 LT |
296 | { |
297 | char tmpbuf[TMPBUFLEN]; | |
298 | ssize_t length; | |
299 | ||
300 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
301 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
302 | } | |
303 | ||
9c2e08c5 | 304 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 305 | .read = sel_read_policyvers, |
57a62c23 | 306 | .llseek = generic_file_llseek, |
1da177e4 LT |
307 | }; |
308 | ||
309 | /* declaration for sel_write_load */ | |
310 | static int sel_make_bools(void); | |
e47c8fc5 | 311 | static int sel_make_classes(void); |
3bb56b25 | 312 | static int sel_make_policycap(void); |
e47c8fc5 CP |
313 | |
314 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 315 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 316 | unsigned long *ino); |
1da177e4 LT |
317 | |
318 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
319 | size_t count, loff_t *ppos) | |
320 | { | |
321 | char tmpbuf[TMPBUFLEN]; | |
322 | ssize_t length; | |
323 | ||
0719aaf5 GT |
324 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
325 | security_mls_enabled()); | |
1da177e4 LT |
326 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
327 | } | |
328 | ||
9c2e08c5 | 329 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 330 | .read = sel_read_mls, |
57a62c23 | 331 | .llseek = generic_file_llseek, |
1da177e4 LT |
332 | }; |
333 | ||
cee74f47 EP |
334 | struct policy_load_memory { |
335 | size_t len; | |
336 | void *data; | |
337 | }; | |
338 | ||
339 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
340 | { | |
341 | struct policy_load_memory *plm = NULL; | |
342 | int rc; | |
343 | ||
344 | BUG_ON(filp->private_data); | |
345 | ||
346 | mutex_lock(&sel_mutex); | |
347 | ||
be0554c9 SS |
348 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
349 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); | |
cee74f47 EP |
350 | if (rc) |
351 | goto err; | |
352 | ||
353 | rc = -EBUSY; | |
354 | if (policy_opened) | |
355 | goto err; | |
356 | ||
357 | rc = -ENOMEM; | |
358 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
359 | if (!plm) | |
360 | goto err; | |
361 | ||
362 | if (i_size_read(inode) != security_policydb_len()) { | |
5955102c | 363 | inode_lock(inode); |
cee74f47 | 364 | i_size_write(inode, security_policydb_len()); |
5955102c | 365 | inode_unlock(inode); |
cee74f47 EP |
366 | } |
367 | ||
368 | rc = security_read_policy(&plm->data, &plm->len); | |
369 | if (rc) | |
370 | goto err; | |
371 | ||
372 | policy_opened = 1; | |
373 | ||
374 | filp->private_data = plm; | |
375 | ||
376 | mutex_unlock(&sel_mutex); | |
377 | ||
378 | return 0; | |
379 | err: | |
380 | mutex_unlock(&sel_mutex); | |
381 | ||
382 | if (plm) | |
383 | vfree(plm->data); | |
384 | kfree(plm); | |
385 | return rc; | |
386 | } | |
387 | ||
388 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
389 | { | |
390 | struct policy_load_memory *plm = filp->private_data; | |
391 | ||
392 | BUG_ON(!plm); | |
393 | ||
394 | policy_opened = 0; | |
395 | ||
396 | vfree(plm->data); | |
397 | kfree(plm); | |
398 | ||
399 | return 0; | |
400 | } | |
401 | ||
402 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
403 | size_t count, loff_t *ppos) | |
404 | { | |
405 | struct policy_load_memory *plm = filp->private_data; | |
406 | int ret; | |
407 | ||
408 | mutex_lock(&sel_mutex); | |
409 | ||
be0554c9 SS |
410 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
411 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); | |
cee74f47 EP |
412 | if (ret) |
413 | goto out; | |
414 | ||
415 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
416 | out: | |
417 | mutex_unlock(&sel_mutex); | |
418 | return ret; | |
419 | } | |
420 | ||
11bac800 | 421 | static int sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 422 | { |
11bac800 | 423 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
424 | unsigned long offset; |
425 | struct page *page; | |
426 | ||
427 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
428 | return VM_FAULT_SIGBUS; | |
429 | ||
430 | offset = vmf->pgoff << PAGE_SHIFT; | |
431 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
432 | return VM_FAULT_SIGBUS; | |
433 | ||
434 | page = vmalloc_to_page(plm->data + offset); | |
435 | get_page(page); | |
436 | ||
437 | vmf->page = page; | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
7cbea8dc | 442 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
443 | .fault = sel_mmap_policy_fault, |
444 | .page_mkwrite = sel_mmap_policy_fault, | |
445 | }; | |
446 | ||
ad3fa08c | 447 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
448 | { |
449 | if (vma->vm_flags & VM_SHARED) { | |
450 | /* do not allow mprotect to make mapping writable */ | |
451 | vma->vm_flags &= ~VM_MAYWRITE; | |
452 | ||
453 | if (vma->vm_flags & VM_WRITE) | |
454 | return -EACCES; | |
455 | } | |
456 | ||
314e51b9 | 457 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
458 | vma->vm_ops = &sel_mmap_policy_ops; |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
cee74f47 EP |
463 | static const struct file_operations sel_policy_ops = { |
464 | .open = sel_open_policy, | |
465 | .read = sel_read_policy, | |
845ca30f | 466 | .mmap = sel_mmap_policy, |
cee74f47 | 467 | .release = sel_release_policy, |
47a93a5b | 468 | .llseek = generic_file_llseek, |
cee74f47 EP |
469 | }; |
470 | ||
1872981b | 471 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
472 | size_t count, loff_t *ppos) |
473 | ||
474 | { | |
1da177e4 LT |
475 | ssize_t length; |
476 | void *data = NULL; | |
477 | ||
bb003079 | 478 | mutex_lock(&sel_mutex); |
1da177e4 | 479 | |
be0554c9 SS |
480 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
481 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); | |
1da177e4 LT |
482 | if (length) |
483 | goto out; | |
484 | ||
b77a493b EP |
485 | /* No partial writes. */ |
486 | length = -EINVAL; | |
487 | if (*ppos != 0) | |
1da177e4 | 488 | goto out; |
1da177e4 | 489 | |
b77a493b EP |
490 | length = -EFBIG; |
491 | if (count > 64 * 1024 * 1024) | |
492 | goto out; | |
493 | ||
494 | length = -ENOMEM; | |
495 | data = vmalloc(count); | |
496 | if (!data) | |
1da177e4 | 497 | goto out; |
1da177e4 LT |
498 | |
499 | length = -EFAULT; | |
500 | if (copy_from_user(data, buf, count) != 0) | |
501 | goto out; | |
502 | ||
503 | length = security_load_policy(data, count); | |
4262fb51 GT |
504 | if (length) { |
505 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 506 | goto out; |
4262fb51 | 507 | } |
1da177e4 | 508 | |
b77a493b | 509 | length = sel_make_bools(); |
4262fb51 GT |
510 | if (length) { |
511 | pr_err("SELinux: failed to load policy booleans\n"); | |
e47c8fc5 | 512 | goto out1; |
4262fb51 | 513 | } |
e47c8fc5 | 514 | |
b77a493b | 515 | length = sel_make_classes(); |
4262fb51 GT |
516 | if (length) { |
517 | pr_err("SELinux: failed to load policy classes\n"); | |
3bb56b25 | 518 | goto out1; |
4262fb51 | 519 | } |
3bb56b25 | 520 | |
b77a493b | 521 | length = sel_make_policycap(); |
4262fb51 GT |
522 | if (length) { |
523 | pr_err("SELinux: failed to load policy capabilities\n"); | |
b77a493b | 524 | goto out1; |
4262fb51 | 525 | } |
b77a493b EP |
526 | |
527 | length = count; | |
e47c8fc5 CP |
528 | |
529 | out1: | |
af601e46 | 530 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 531 | "policy loaded auid=%u ses=%u", |
581abc09 | 532 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 533 | audit_get_sessionid(current)); |
1da177e4 | 534 | out: |
bb003079 | 535 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
536 | vfree(data); |
537 | return length; | |
538 | } | |
539 | ||
9c2e08c5 | 540 | static const struct file_operations sel_load_ops = { |
1da177e4 | 541 | .write = sel_write_load, |
57a62c23 | 542 | .llseek = generic_file_llseek, |
1da177e4 LT |
543 | }; |
544 | ||
1872981b | 545 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 546 | { |
b77a493b | 547 | char *canon = NULL; |
ce9982d0 | 548 | u32 sid, len; |
1da177e4 LT |
549 | ssize_t length; |
550 | ||
be0554c9 SS |
551 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
552 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); | |
1da177e4 | 553 | if (length) |
b77a493b | 554 | goto out; |
1da177e4 | 555 | |
52a4c640 | 556 | length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
557 | if (length) |
558 | goto out; | |
1da177e4 | 559 | |
ce9982d0 | 560 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
561 | if (length) |
562 | goto out; | |
ce9982d0 | 563 | |
b77a493b | 564 | length = -ERANGE; |
ce9982d0 | 565 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
566 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
567 | "payload max\n", __func__, len); | |
1da177e4 | 568 | goto out; |
ce9982d0 | 569 | } |
1da177e4 | 570 | |
ce9982d0 SS |
571 | memcpy(buf, canon, len); |
572 | length = len; | |
1da177e4 | 573 | out: |
ce9982d0 | 574 | kfree(canon); |
1da177e4 LT |
575 | return length; |
576 | } | |
577 | ||
1da177e4 LT |
578 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
579 | size_t count, loff_t *ppos) | |
580 | { | |
581 | char tmpbuf[TMPBUFLEN]; | |
582 | ssize_t length; | |
583 | ||
584 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
585 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
586 | } | |
587 | ||
1872981b | 588 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
589 | size_t count, loff_t *ppos) |
590 | { | |
8365a719 | 591 | char *page; |
1da177e4 LT |
592 | ssize_t length; |
593 | unsigned int new_value; | |
594 | ||
be0554c9 SS |
595 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
596 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, | |
597 | NULL); | |
1da177e4 | 598 | if (length) |
8365a719 | 599 | return length; |
1da177e4 | 600 | |
bfd51626 | 601 | if (count >= PAGE_SIZE) |
8365a719 | 602 | return -ENOMEM; |
b77a493b EP |
603 | |
604 | /* No partial writes. */ | |
b77a493b | 605 | if (*ppos != 0) |
8365a719 | 606 | return -EINVAL; |
b77a493b | 607 | |
8365a719 AV |
608 | page = memdup_user_nul(buf, count); |
609 | if (IS_ERR(page)) | |
610 | return PTR_ERR(page); | |
1da177e4 LT |
611 | |
612 | length = -EINVAL; | |
613 | if (sscanf(page, "%u", &new_value) != 1) | |
614 | goto out; | |
615 | ||
616 | selinux_checkreqprot = new_value ? 1 : 0; | |
617 | length = count; | |
618 | out: | |
8365a719 | 619 | kfree(page); |
1da177e4 LT |
620 | return length; |
621 | } | |
9c2e08c5 | 622 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
623 | .read = sel_read_checkreqprot, |
624 | .write = sel_write_checkreqprot, | |
57a62c23 | 625 | .llseek = generic_file_llseek, |
1da177e4 LT |
626 | }; |
627 | ||
f9df6458 AP |
628 | static ssize_t sel_write_validatetrans(struct file *file, |
629 | const char __user *buf, | |
630 | size_t count, loff_t *ppos) | |
631 | { | |
632 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; | |
633 | char *req = NULL; | |
634 | u32 osid, nsid, tsid; | |
635 | u16 tclass; | |
636 | int rc; | |
637 | ||
be0554c9 SS |
638 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
639 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); | |
f9df6458 AP |
640 | if (rc) |
641 | goto out; | |
642 | ||
643 | rc = -ENOMEM; | |
644 | if (count >= PAGE_SIZE) | |
645 | goto out; | |
646 | ||
647 | /* No partial writes. */ | |
648 | rc = -EINVAL; | |
649 | if (*ppos != 0) | |
650 | goto out; | |
651 | ||
652 | rc = -ENOMEM; | |
653 | req = kzalloc(count + 1, GFP_KERNEL); | |
654 | if (!req) | |
655 | goto out; | |
656 | ||
657 | rc = -EFAULT; | |
658 | if (copy_from_user(req, buf, count)) | |
659 | goto out; | |
660 | ||
661 | rc = -ENOMEM; | |
662 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
663 | if (!oldcon) | |
664 | goto out; | |
665 | ||
666 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
667 | if (!newcon) | |
668 | goto out; | |
669 | ||
670 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
671 | if (!taskcon) | |
672 | goto out; | |
673 | ||
674 | rc = -EINVAL; | |
675 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
676 | goto out; | |
677 | ||
678 | rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); | |
679 | if (rc) | |
680 | goto out; | |
681 | ||
682 | rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); | |
683 | if (rc) | |
684 | goto out; | |
685 | ||
686 | rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); | |
687 | if (rc) | |
688 | goto out; | |
689 | ||
690 | rc = security_validate_transition_user(osid, nsid, tsid, tclass); | |
691 | if (!rc) | |
692 | rc = count; | |
693 | out: | |
694 | kfree(req); | |
695 | kfree(oldcon); | |
696 | kfree(newcon); | |
697 | kfree(taskcon); | |
698 | return rc; | |
699 | } | |
700 | ||
701 | static const struct file_operations sel_transition_ops = { | |
702 | .write = sel_write_validatetrans, | |
703 | .llseek = generic_file_llseek, | |
704 | }; | |
705 | ||
1da177e4 LT |
706 | /* |
707 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
708 | */ | |
1872981b EP |
709 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
710 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
711 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
712 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
713 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
714 | |
715 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
716 | [SEL_ACCESS] = sel_write_access, | |
717 | [SEL_CREATE] = sel_write_create, | |
718 | [SEL_RELABEL] = sel_write_relabel, | |
719 | [SEL_USER] = sel_write_user, | |
720 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 721 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
722 | }; |
723 | ||
724 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
725 | { | |
496ad9aa | 726 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
727 | char *data; |
728 | ssize_t rv; | |
729 | ||
6e20a64a | 730 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
731 | return -EINVAL; |
732 | ||
733 | data = simple_transaction_get(file, buf, size); | |
734 | if (IS_ERR(data)) | |
735 | return PTR_ERR(data); | |
736 | ||
1872981b EP |
737 | rv = write_op[ino](file, data, size); |
738 | if (rv > 0) { | |
1da177e4 LT |
739 | simple_transaction_set(file, rv); |
740 | rv = size; | |
741 | } | |
742 | return rv; | |
743 | } | |
744 | ||
9c2e08c5 | 745 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
746 | .write = selinux_transaction_write, |
747 | .read = simple_transaction_read, | |
748 | .release = simple_transaction_release, | |
57a62c23 | 749 | .llseek = generic_file_llseek, |
1da177e4 LT |
750 | }; |
751 | ||
752 | /* | |
753 | * payload - write methods | |
754 | * If the method has a response, the response should be put in buf, | |
755 | * and the length returned. Otherwise return 0 or and -error. | |
756 | */ | |
757 | ||
1872981b | 758 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 759 | { |
b77a493b | 760 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
761 | u32 ssid, tsid; |
762 | u16 tclass; | |
1da177e4 LT |
763 | struct av_decision avd; |
764 | ssize_t length; | |
765 | ||
be0554c9 SS |
766 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
767 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); | |
1da177e4 | 768 | if (length) |
b77a493b | 769 | goto out; |
1da177e4 LT |
770 | |
771 | length = -ENOMEM; | |
c1a7368a | 772 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 773 | if (!scon) |
b77a493b | 774 | goto out; |
1da177e4 | 775 | |
b77a493b | 776 | length = -ENOMEM; |
c1a7368a | 777 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
778 | if (!tcon) |
779 | goto out; | |
1da177e4 LT |
780 | |
781 | length = -EINVAL; | |
19439d05 | 782 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 783 | goto out; |
1da177e4 | 784 | |
44be2f65 | 785 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
786 | if (length) |
787 | goto out; | |
788 | ||
44be2f65 | 789 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
790 | if (length) |
791 | goto out; | |
1da177e4 | 792 | |
19439d05 | 793 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
794 | |
795 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 796 | "%x %x %x %x %u %x", |
f1c6381a | 797 | avd.allowed, 0xffffffff, |
1da177e4 | 798 | avd.auditallow, avd.auditdeny, |
8a6f83af | 799 | avd.seqno, avd.flags); |
1da177e4 | 800 | out: |
b77a493b | 801 | kfree(tcon); |
1da177e4 LT |
802 | kfree(scon); |
803 | return length; | |
804 | } | |
805 | ||
1872981b | 806 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 807 | { |
b77a493b | 808 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 809 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
810 | u32 ssid, tsid, newsid; |
811 | u16 tclass; | |
812 | ssize_t length; | |
b77a493b | 813 | char *newcon = NULL; |
1da177e4 | 814 | u32 len; |
f50a3ec9 | 815 | int nargs; |
1da177e4 | 816 | |
be0554c9 SS |
817 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
818 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, | |
819 | NULL); | |
1da177e4 | 820 | if (length) |
b77a493b | 821 | goto out; |
1da177e4 LT |
822 | |
823 | length = -ENOMEM; | |
c1a7368a | 824 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 825 | if (!scon) |
b77a493b | 826 | goto out; |
1da177e4 | 827 | |
b77a493b | 828 | length = -ENOMEM; |
c1a7368a | 829 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
830 | if (!tcon) |
831 | goto out; | |
1da177e4 | 832 | |
f50a3ec9 KK |
833 | length = -ENOMEM; |
834 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
835 | if (!namebuf) | |
836 | goto out; | |
837 | ||
1da177e4 | 838 | length = -EINVAL; |
f50a3ec9 KK |
839 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
840 | if (nargs < 3 || nargs > 4) | |
b77a493b | 841 | goto out; |
0f7e4c33 KK |
842 | if (nargs == 4) { |
843 | /* | |
844 | * If and when the name of new object to be queried contains | |
845 | * either whitespace or multibyte characters, they shall be | |
846 | * encoded based on the percentage-encoding rule. | |
847 | * If not encoded, the sscanf logic picks up only left-half | |
848 | * of the supplied name; splitted by a whitespace unexpectedly. | |
849 | */ | |
850 | char *r, *w; | |
851 | int c1, c2; | |
852 | ||
853 | r = w = namebuf; | |
854 | do { | |
855 | c1 = *r++; | |
856 | if (c1 == '+') | |
857 | c1 = ' '; | |
858 | else if (c1 == '%') { | |
af7ff2c2 AS |
859 | c1 = hex_to_bin(*r++); |
860 | if (c1 < 0) | |
0f7e4c33 | 861 | goto out; |
af7ff2c2 AS |
862 | c2 = hex_to_bin(*r++); |
863 | if (c2 < 0) | |
0f7e4c33 KK |
864 | goto out; |
865 | c1 = (c1 << 4) | c2; | |
866 | } | |
867 | *w++ = c1; | |
868 | } while (c1 != '\0'); | |
869 | ||
f50a3ec9 | 870 | objname = namebuf; |
0f7e4c33 | 871 | } |
1da177e4 | 872 | |
44be2f65 | 873 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
874 | if (length) |
875 | goto out; | |
876 | ||
44be2f65 | 877 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
878 | if (length) |
879 | goto out; | |
1da177e4 | 880 | |
f50a3ec9 KK |
881 | length = security_transition_sid_user(ssid, tsid, tclass, |
882 | objname, &newsid); | |
b77a493b EP |
883 | if (length) |
884 | goto out; | |
1da177e4 LT |
885 | |
886 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
887 | if (length) |
888 | goto out; | |
1da177e4 | 889 | |
b77a493b | 890 | length = -ERANGE; |
1da177e4 | 891 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
892 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
893 | "payload max\n", __func__, len); | |
b77a493b | 894 | goto out; |
1da177e4 LT |
895 | } |
896 | ||
897 | memcpy(buf, newcon, len); | |
898 | length = len; | |
b77a493b | 899 | out: |
1da177e4 | 900 | kfree(newcon); |
f50a3ec9 | 901 | kfree(namebuf); |
1da177e4 | 902 | kfree(tcon); |
1da177e4 LT |
903 | kfree(scon); |
904 | return length; | |
905 | } | |
906 | ||
1872981b | 907 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 908 | { |
b77a493b | 909 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
910 | u32 ssid, tsid, newsid; |
911 | u16 tclass; | |
912 | ssize_t length; | |
b77a493b | 913 | char *newcon = NULL; |
1da177e4 LT |
914 | u32 len; |
915 | ||
be0554c9 SS |
916 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
917 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, | |
918 | NULL); | |
1da177e4 | 919 | if (length) |
b77a493b | 920 | goto out; |
1da177e4 LT |
921 | |
922 | length = -ENOMEM; | |
c1a7368a | 923 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 924 | if (!scon) |
b77a493b | 925 | goto out; |
1da177e4 | 926 | |
b77a493b | 927 | length = -ENOMEM; |
c1a7368a | 928 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
929 | if (!tcon) |
930 | goto out; | |
1da177e4 LT |
931 | |
932 | length = -EINVAL; | |
933 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 934 | goto out; |
1da177e4 | 935 | |
44be2f65 | 936 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
937 | if (length) |
938 | goto out; | |
939 | ||
44be2f65 | 940 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
941 | if (length) |
942 | goto out; | |
1da177e4 LT |
943 | |
944 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
945 | if (length) |
946 | goto out; | |
1da177e4 LT |
947 | |
948 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
949 | if (length) |
950 | goto out; | |
1da177e4 | 951 | |
b77a493b EP |
952 | length = -ERANGE; |
953 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
954 | goto out; | |
1da177e4 LT |
955 | |
956 | memcpy(buf, newcon, len); | |
957 | length = len; | |
b77a493b | 958 | out: |
1da177e4 | 959 | kfree(newcon); |
1da177e4 | 960 | kfree(tcon); |
1da177e4 LT |
961 | kfree(scon); |
962 | return length; | |
963 | } | |
964 | ||
1872981b | 965 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 966 | { |
b77a493b EP |
967 | char *con = NULL, *user = NULL, *ptr; |
968 | u32 sid, *sids = NULL; | |
1da177e4 LT |
969 | ssize_t length; |
970 | char *newcon; | |
971 | int i, rc; | |
972 | u32 len, nsids; | |
973 | ||
be0554c9 SS |
974 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
975 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, | |
976 | NULL); | |
1da177e4 | 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 | ||
be0554c9 SS |
1036 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1037 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, | |
1038 | NULL); | |
1da177e4 | 1039 | if (length) |
b77a493b | 1040 | goto out; |
1da177e4 LT |
1041 | |
1042 | length = -ENOMEM; | |
c1a7368a | 1043 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1044 | if (!scon) |
6eab04a8 | 1045 | goto out; |
1da177e4 | 1046 | |
b77a493b | 1047 | length = -ENOMEM; |
c1a7368a | 1048 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1049 | if (!tcon) |
1050 | goto out; | |
1da177e4 LT |
1051 | |
1052 | length = -EINVAL; | |
1053 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1054 | goto out; |
1da177e4 | 1055 | |
44be2f65 | 1056 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1057 | if (length) |
1058 | goto out; | |
1059 | ||
44be2f65 | 1060 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1061 | if (length) |
1062 | goto out; | |
1da177e4 LT |
1063 | |
1064 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1065 | if (length) |
1066 | goto out; | |
1da177e4 LT |
1067 | |
1068 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1069 | if (length) |
1070 | goto out; | |
1da177e4 | 1071 | |
b77a493b | 1072 | length = -ERANGE; |
1da177e4 | 1073 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1074 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1075 | "payload max\n", __func__, len); | |
b77a493b | 1076 | goto out; |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | memcpy(buf, newcon, len); | |
1080 | length = len; | |
b77a493b | 1081 | out: |
1da177e4 | 1082 | kfree(newcon); |
1da177e4 | 1083 | kfree(tcon); |
1da177e4 LT |
1084 | kfree(scon); |
1085 | return length; | |
1086 | } | |
1087 | ||
1088 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1089 | { | |
1090 | struct inode *ret = new_inode(sb); | |
1091 | ||
1092 | if (ret) { | |
1093 | ret->i_mode = mode; | |
078cd827 | 1094 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1095 | } |
1096 | return ret; | |
1097 | } | |
1098 | ||
1da177e4 LT |
1099 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1100 | size_t count, loff_t *ppos) | |
1101 | { | |
1102 | char *page = NULL; | |
1103 | ssize_t length; | |
1da177e4 LT |
1104 | ssize_t ret; |
1105 | int cur_enforcing; | |
496ad9aa | 1106 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1107 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1108 | |
bb003079 | 1109 | mutex_lock(&sel_mutex); |
1da177e4 | 1110 | |
b77a493b EP |
1111 | ret = -EINVAL; |
1112 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1113 | goto out; |
1da177e4 | 1114 | |
b77a493b | 1115 | ret = -ENOMEM; |
1872981b | 1116 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1117 | if (!page) |
1da177e4 | 1118 | goto out; |
1da177e4 | 1119 | |
d313f948 | 1120 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1121 | if (cur_enforcing < 0) { |
1122 | ret = cur_enforcing; | |
1123 | goto out; | |
1124 | } | |
1da177e4 | 1125 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1126 | bool_pending_values[index]); |
68bdcf28 | 1127 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1128 | out: |
bb003079 | 1129 | mutex_unlock(&sel_mutex); |
b77a493b | 1130 | free_page((unsigned long)page); |
1da177e4 LT |
1131 | return ret; |
1132 | } | |
1133 | ||
1134 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1135 | size_t count, loff_t *ppos) | |
1136 | { | |
1137 | char *page = NULL; | |
d313f948 | 1138 | ssize_t length; |
1da177e4 | 1139 | int new_value; |
496ad9aa | 1140 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1141 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1142 | |
bb003079 | 1143 | mutex_lock(&sel_mutex); |
1da177e4 | 1144 | |
be0554c9 SS |
1145 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1146 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1147 | NULL); | |
1da177e4 LT |
1148 | if (length) |
1149 | goto out; | |
1150 | ||
b77a493b EP |
1151 | length = -EINVAL; |
1152 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1153 | goto out; |
d313f948 | 1154 | |
b77a493b EP |
1155 | length = -ENOMEM; |
1156 | if (count >= PAGE_SIZE) | |
1da177e4 | 1157 | goto out; |
d313f948 | 1158 | |
b77a493b EP |
1159 | /* No partial writes. */ |
1160 | length = -EINVAL; | |
1161 | if (*ppos != 0) | |
1da177e4 | 1162 | goto out; |
b77a493b | 1163 | |
8365a719 AV |
1164 | page = memdup_user_nul(buf, count); |
1165 | if (IS_ERR(page)) { | |
1166 | length = PTR_ERR(page); | |
1167 | page = NULL; | |
1da177e4 | 1168 | goto out; |
8365a719 | 1169 | } |
1da177e4 LT |
1170 | |
1171 | length = -EINVAL; | |
1172 | if (sscanf(page, "%d", &new_value) != 1) | |
1173 | goto out; | |
1174 | ||
1175 | if (new_value) | |
1176 | new_value = 1; | |
1177 | ||
d313f948 | 1178 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1179 | length = count; |
1180 | ||
1181 | out: | |
bb003079 | 1182 | mutex_unlock(&sel_mutex); |
8365a719 | 1183 | kfree(page); |
1da177e4 LT |
1184 | return length; |
1185 | } | |
1186 | ||
9c2e08c5 | 1187 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1188 | .read = sel_read_bool, |
1189 | .write = sel_write_bool, | |
57a62c23 | 1190 | .llseek = generic_file_llseek, |
1da177e4 LT |
1191 | }; |
1192 | ||
1193 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1194 | const char __user *buf, | |
1195 | size_t count, loff_t *ppos) | |
1196 | { | |
1197 | char *page = NULL; | |
d313f948 | 1198 | ssize_t length; |
1da177e4 LT |
1199 | int new_value; |
1200 | ||
bb003079 | 1201 | mutex_lock(&sel_mutex); |
1da177e4 | 1202 | |
be0554c9 SS |
1203 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1204 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1205 | NULL); | |
1da177e4 LT |
1206 | if (length) |
1207 | goto out; | |
1208 | ||
b77a493b EP |
1209 | length = -ENOMEM; |
1210 | if (count >= PAGE_SIZE) | |
1da177e4 | 1211 | goto out; |
b77a493b EP |
1212 | |
1213 | /* No partial writes. */ | |
1214 | length = -EINVAL; | |
1215 | if (*ppos != 0) | |
1da177e4 | 1216 | goto out; |
b77a493b | 1217 | |
8365a719 AV |
1218 | page = memdup_user_nul(buf, count); |
1219 | if (IS_ERR(page)) { | |
1220 | length = PTR_ERR(page); | |
1221 | page = NULL; | |
1da177e4 | 1222 | goto out; |
8365a719 | 1223 | } |
1da177e4 LT |
1224 | |
1225 | length = -EINVAL; | |
1226 | if (sscanf(page, "%d", &new_value) != 1) | |
1227 | goto out; | |
1228 | ||
b77a493b | 1229 | length = 0; |
1872981b | 1230 | if (new_value && bool_pending_values) |
b77a493b | 1231 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1232 | |
b77a493b EP |
1233 | if (!length) |
1234 | length = count; | |
1da177e4 LT |
1235 | |
1236 | out: | |
bb003079 | 1237 | mutex_unlock(&sel_mutex); |
8365a719 | 1238 | kfree(page); |
1da177e4 LT |
1239 | return length; |
1240 | } | |
1241 | ||
9c2e08c5 | 1242 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1243 | .write = sel_commit_bools_write, |
57a62c23 | 1244 | .llseek = generic_file_llseek, |
1da177e4 LT |
1245 | }; |
1246 | ||
0c92d7c7 | 1247 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1248 | { |
ad52184b AV |
1249 | d_genocide(de); |
1250 | shrink_dcache_parent(de); | |
1da177e4 LT |
1251 | } |
1252 | ||
1253 | #define BOOL_DIR_NAME "booleans" | |
1254 | ||
1255 | static int sel_make_bools(void) | |
1256 | { | |
b77a493b | 1257 | int i, ret; |
1da177e4 LT |
1258 | ssize_t len; |
1259 | struct dentry *dentry = NULL; | |
1260 | struct dentry *dir = bool_dir; | |
1261 | struct inode *inode = NULL; | |
1262 | struct inode_security_struct *isec; | |
1263 | char **names = NULL, *page; | |
1264 | int num; | |
1265 | int *values = NULL; | |
1266 | u32 sid; | |
1267 | ||
1268 | /* remove any existing files */ | |
8007f102 XF |
1269 | for (i = 0; i < bool_num; i++) |
1270 | kfree(bool_pending_names[i]); | |
d313f948 | 1271 | kfree(bool_pending_names); |
9a5f04bf | 1272 | kfree(bool_pending_values); |
154c50ca | 1273 | bool_num = 0; |
d313f948 | 1274 | bool_pending_names = NULL; |
20c19e41 | 1275 | bool_pending_values = NULL; |
1da177e4 | 1276 | |
0c92d7c7 | 1277 | sel_remove_entries(dir); |
1da177e4 | 1278 | |
b77a493b | 1279 | ret = -ENOMEM; |
1872981b EP |
1280 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1281 | if (!page) | |
b77a493b | 1282 | goto out; |
1da177e4 LT |
1283 | |
1284 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1285 | if (ret) |
1da177e4 LT |
1286 | goto out; |
1287 | ||
1288 | for (i = 0; i < num; i++) { | |
b77a493b | 1289 | ret = -ENOMEM; |
1da177e4 | 1290 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1291 | if (!dentry) |
1292 | goto out; | |
1293 | ||
1294 | ret = -ENOMEM; | |
1da177e4 | 1295 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1296 | if (!inode) |
1297 | goto out; | |
1da177e4 | 1298 | |
b77a493b | 1299 | ret = -ENAMETOOLONG; |
cc1dad71 | 1300 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1301 | if (len >= PAGE_SIZE) |
1302 | goto out; | |
1303 | ||
1872981b EP |
1304 | isec = (struct inode_security_struct *)inode->i_security; |
1305 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
4262fb51 | 1306 | if (ret) { |
900fde06 GT |
1307 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1308 | page); | |
1309 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1310 | } |
1311 | ||
1da177e4 | 1312 | isec->sid = sid; |
42059112 | 1313 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1314 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1315 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1316 | d_add(dentry, inode); |
1317 | } | |
1318 | bool_num = num; | |
d313f948 | 1319 | bool_pending_names = names; |
1da177e4 | 1320 | bool_pending_values = values; |
b77a493b EP |
1321 | |
1322 | free_page((unsigned long)page); | |
1323 | return 0; | |
1da177e4 LT |
1324 | out: |
1325 | free_page((unsigned long)page); | |
b77a493b | 1326 | |
1da177e4 | 1327 | if (names) { |
9a5f04bf JJ |
1328 | for (i = 0; i < num; i++) |
1329 | kfree(names[i]); | |
1da177e4 LT |
1330 | kfree(names); |
1331 | } | |
20c19e41 | 1332 | kfree(values); |
0c92d7c7 | 1333 | sel_remove_entries(dir); |
b77a493b EP |
1334 | |
1335 | return ret; | |
1da177e4 LT |
1336 | } |
1337 | ||
1338 | #define NULL_FILE_NAME "null" | |
1339 | ||
765927b2 | 1340 | struct path selinux_null; |
1da177e4 LT |
1341 | |
1342 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1343 | size_t count, loff_t *ppos) | |
1344 | { | |
1345 | char tmpbuf[TMPBUFLEN]; | |
1346 | ssize_t length; | |
1347 | ||
1348 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1349 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1350 | } | |
1351 | ||
1872981b EP |
1352 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1353 | const char __user *buf, | |
1da177e4 LT |
1354 | size_t count, loff_t *ppos) |
1355 | ||
1356 | { | |
8365a719 | 1357 | char *page; |
1da177e4 | 1358 | ssize_t ret; |
309c5fad | 1359 | unsigned int new_value; |
1da177e4 | 1360 | |
be0554c9 SS |
1361 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1362 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, | |
1363 | NULL); | |
b77a493b | 1364 | if (ret) |
8365a719 | 1365 | return ret; |
1da177e4 | 1366 | |
b77a493b | 1367 | if (count >= PAGE_SIZE) |
8365a719 | 1368 | return -ENOMEM; |
1da177e4 | 1369 | |
b77a493b | 1370 | /* No partial writes. */ |
b77a493b | 1371 | if (*ppos != 0) |
8365a719 | 1372 | return -EINVAL; |
1da177e4 | 1373 | |
8365a719 AV |
1374 | page = memdup_user_nul(buf, count); |
1375 | if (IS_ERR(page)) | |
1376 | return PTR_ERR(page); | |
1da177e4 | 1377 | |
b77a493b EP |
1378 | ret = -EINVAL; |
1379 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1380 | goto out; |
1da177e4 | 1381 | |
b77a493b EP |
1382 | avc_cache_threshold = new_value; |
1383 | ||
1da177e4 | 1384 | ret = count; |
1da177e4 | 1385 | out: |
8365a719 | 1386 | kfree(page); |
1da177e4 LT |
1387 | return ret; |
1388 | } | |
1389 | ||
1390 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1391 | size_t count, loff_t *ppos) | |
1392 | { | |
1393 | char *page; | |
b77a493b | 1394 | ssize_t length; |
1da177e4 LT |
1395 | |
1396 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1397 | if (!page) |
1398 | return -ENOMEM; | |
1399 | ||
1400 | length = avc_get_hash_stats(page); | |
1401 | if (length >= 0) | |
1402 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1403 | free_page((unsigned long)page); |
b77a493b EP |
1404 | |
1405 | return length; | |
1da177e4 LT |
1406 | } |
1407 | ||
9c2e08c5 | 1408 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1409 | .read = sel_read_avc_cache_threshold, |
1410 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1411 | .llseek = generic_file_llseek, |
1da177e4 LT |
1412 | }; |
1413 | ||
9c2e08c5 | 1414 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1415 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1416 | .llseek = generic_file_llseek, |
1da177e4 LT |
1417 | }; |
1418 | ||
1419 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1420 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1421 | { | |
1422 | int cpu; | |
1423 | ||
4f4b6c1a | 1424 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1425 | if (!cpu_possible(cpu)) |
1426 | continue; | |
1427 | *idx = cpu + 1; | |
1428 | return &per_cpu(avc_cache_stats, cpu); | |
1429 | } | |
1430 | return NULL; | |
1431 | } | |
1432 | ||
1433 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1434 | { | |
1435 | loff_t n = *pos - 1; | |
1436 | ||
1437 | if (*pos == 0) | |
1438 | return SEQ_START_TOKEN; | |
1439 | ||
1440 | return sel_avc_get_stat_idx(&n); | |
1441 | } | |
1442 | ||
1443 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1444 | { | |
1445 | return sel_avc_get_stat_idx(pos); | |
1446 | } | |
1447 | ||
1448 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1449 | { | |
1450 | struct avc_cache_stats *st = v; | |
1451 | ||
710a0647 ME |
1452 | if (v == SEQ_START_TOKEN) { |
1453 | seq_puts(seq, | |
1454 | "lookups hits misses allocations reclaims frees\n"); | |
1455 | } else { | |
257313b2 LT |
1456 | unsigned int lookups = st->lookups; |
1457 | unsigned int misses = st->misses; | |
1458 | unsigned int hits = lookups - misses; | |
1459 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1460 | hits, misses, st->allocations, | |
1da177e4 | 1461 | st->reclaims, st->frees); |
257313b2 | 1462 | } |
1da177e4 LT |
1463 | return 0; |
1464 | } | |
1465 | ||
1466 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1467 | { } | |
1468 | ||
1996a109 | 1469 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1470 | .start = sel_avc_stats_seq_start, |
1471 | .next = sel_avc_stats_seq_next, | |
1472 | .show = sel_avc_stats_seq_show, | |
1473 | .stop = sel_avc_stats_seq_stop, | |
1474 | }; | |
1475 | ||
1476 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1477 | { | |
1478 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1479 | } | |
1480 | ||
9c2e08c5 | 1481 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1482 | .open = sel_open_avc_cache_stats, |
1483 | .read = seq_read, | |
1484 | .llseek = seq_lseek, | |
1485 | .release = seq_release, | |
1486 | }; | |
1487 | #endif | |
1488 | ||
1489 | static int sel_make_avc_files(struct dentry *dir) | |
1490 | { | |
b77a493b | 1491 | int i; |
cda37124 | 1492 | static const struct tree_descr files[] = { |
1da177e4 LT |
1493 | { "cache_threshold", |
1494 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1495 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1496 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1497 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1498 | #endif | |
1499 | }; | |
1500 | ||
6e20a64a | 1501 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1502 | struct inode *inode; |
1503 | struct dentry *dentry; | |
1504 | ||
1505 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1506 | if (!dentry) |
1507 | return -ENOMEM; | |
1da177e4 LT |
1508 | |
1509 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1510 | if (!inode) |
1511 | return -ENOMEM; | |
1512 | ||
1da177e4 | 1513 | inode->i_fop = files[i].ops; |
6174eafc | 1514 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1515 | d_add(dentry, inode); |
1516 | } | |
b77a493b EP |
1517 | |
1518 | return 0; | |
1da177e4 LT |
1519 | } |
1520 | ||
1872981b | 1521 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1522 | size_t count, loff_t *ppos) |
1523 | { | |
f0ee2e46 JC |
1524 | char *con; |
1525 | u32 sid, len; | |
1526 | ssize_t ret; | |
1527 | ||
496ad9aa | 1528 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1529 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1530 | if (ret) |
f0ee2e46 JC |
1531 | return ret; |
1532 | ||
1533 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1534 | kfree(con); | |
1535 | return ret; | |
1536 | } | |
1537 | ||
1538 | static const struct file_operations sel_initcon_ops = { | |
1539 | .read = sel_read_initcon, | |
57a62c23 | 1540 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1541 | }; |
1542 | ||
1543 | static int sel_make_initcon_files(struct dentry *dir) | |
1544 | { | |
b77a493b | 1545 | int i; |
f0ee2e46 JC |
1546 | |
1547 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1548 | struct inode *inode; | |
1549 | struct dentry *dentry; | |
1550 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1551 | if (!dentry) |
1552 | return -ENOMEM; | |
f0ee2e46 JC |
1553 | |
1554 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1555 | if (!inode) |
1556 | return -ENOMEM; | |
1557 | ||
f0ee2e46 JC |
1558 | inode->i_fop = &sel_initcon_ops; |
1559 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1560 | d_add(dentry, inode); | |
1561 | } | |
b77a493b EP |
1562 | |
1563 | return 0; | |
f0ee2e46 JC |
1564 | } |
1565 | ||
e47c8fc5 CP |
1566 | static inline unsigned long sel_class_to_ino(u16 class) |
1567 | { | |
1568 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1569 | } | |
1570 | ||
1571 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1572 | { | |
92ae9e82 | 1573 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1574 | } |
1575 | ||
1576 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1577 | { | |
1578 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1579 | } | |
1580 | ||
1581 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1582 | { | |
1583 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1584 | } | |
1585 | ||
1872981b | 1586 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1587 | size_t count, loff_t *ppos) |
1588 | { | |
496ad9aa | 1589 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1590 | char res[TMPBUFLEN]; |
1591 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1592 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1593 | } |
1594 | ||
1595 | static const struct file_operations sel_class_ops = { | |
1596 | .read = sel_read_class, | |
57a62c23 | 1597 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1598 | }; |
1599 | ||
1872981b | 1600 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1601 | size_t count, loff_t *ppos) |
1602 | { | |
496ad9aa | 1603 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1604 | char res[TMPBUFLEN]; |
1605 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1606 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1607 | } |
1608 | ||
1609 | static const struct file_operations sel_perm_ops = { | |
1610 | .read = sel_read_perm, | |
57a62c23 | 1611 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1612 | }; |
1613 | ||
3bb56b25 PM |
1614 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1615 | size_t count, loff_t *ppos) | |
1616 | { | |
1617 | int value; | |
1618 | char tmpbuf[TMPBUFLEN]; | |
1619 | ssize_t length; | |
496ad9aa | 1620 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1621 | |
1622 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1623 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1624 | ||
1625 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1626 | } | |
1627 | ||
1628 | static const struct file_operations sel_policycap_ops = { | |
1629 | .read = sel_read_policycap, | |
57a62c23 | 1630 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1631 | }; |
1632 | ||
e47c8fc5 CP |
1633 | static int sel_make_perm_files(char *objclass, int classvalue, |
1634 | struct dentry *dir) | |
1635 | { | |
b77a493b | 1636 | int i, rc, nperms; |
e47c8fc5 CP |
1637 | char **perms; |
1638 | ||
1639 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1640 | if (rc) | |
b77a493b | 1641 | return rc; |
e47c8fc5 CP |
1642 | |
1643 | for (i = 0; i < nperms; i++) { | |
1644 | struct inode *inode; | |
1645 | struct dentry *dentry; | |
1646 | ||
b77a493b | 1647 | rc = -ENOMEM; |
e47c8fc5 | 1648 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1649 | if (!dentry) |
1650 | goto out; | |
e47c8fc5 | 1651 | |
b77a493b | 1652 | rc = -ENOMEM; |
e47c8fc5 | 1653 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1654 | if (!inode) |
1655 | goto out; | |
1656 | ||
e47c8fc5 CP |
1657 | inode->i_fop = &sel_perm_ops; |
1658 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1659 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1660 | d_add(dentry, inode); |
1661 | } | |
b77a493b EP |
1662 | rc = 0; |
1663 | out: | |
e47c8fc5 CP |
1664 | for (i = 0; i < nperms; i++) |
1665 | kfree(perms[i]); | |
1666 | kfree(perms); | |
e47c8fc5 CP |
1667 | return rc; |
1668 | } | |
1669 | ||
1670 | static int sel_make_class_dir_entries(char *classname, int index, | |
1671 | struct dentry *dir) | |
1672 | { | |
1673 | struct dentry *dentry = NULL; | |
1674 | struct inode *inode = NULL; | |
1675 | int rc; | |
1676 | ||
1677 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1678 | if (!dentry) |
1679 | return -ENOMEM; | |
e47c8fc5 CP |
1680 | |
1681 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1682 | if (!inode) |
1683 | return -ENOMEM; | |
e47c8fc5 CP |
1684 | |
1685 | inode->i_fop = &sel_class_ops; | |
1686 | inode->i_ino = sel_class_to_ino(index); | |
1687 | d_add(dentry, inode); | |
1688 | ||
a1c2aa1e AV |
1689 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1690 | if (IS_ERR(dentry)) | |
1691 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1692 | |
1693 | rc = sel_make_perm_files(classname, index, dentry); | |
1694 | ||
e47c8fc5 CP |
1695 | return rc; |
1696 | } | |
1697 | ||
e47c8fc5 CP |
1698 | static int sel_make_classes(void) |
1699 | { | |
b77a493b | 1700 | int rc, nclasses, i; |
e47c8fc5 CP |
1701 | char **classes; |
1702 | ||
1703 | /* delete any existing entries */ | |
ad52184b | 1704 | sel_remove_entries(class_dir); |
e47c8fc5 CP |
1705 | |
1706 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1707 | if (rc) |
1708 | return rc; | |
e47c8fc5 CP |
1709 | |
1710 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1711 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1712 | |
1713 | for (i = 0; i < nclasses; i++) { | |
1714 | struct dentry *class_name_dir; | |
1715 | ||
a1c2aa1e | 1716 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1717 | &last_class_ino); |
a1c2aa1e AV |
1718 | if (IS_ERR(class_name_dir)) { |
1719 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1720 | goto out; |
a1c2aa1e | 1721 | } |
e47c8fc5 CP |
1722 | |
1723 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1724 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1725 | class_name_dir); |
1726 | if (rc) | |
b77a493b | 1727 | goto out; |
e47c8fc5 | 1728 | } |
b77a493b EP |
1729 | rc = 0; |
1730 | out: | |
e47c8fc5 CP |
1731 | for (i = 0; i < nclasses; i++) |
1732 | kfree(classes[i]); | |
1733 | kfree(classes); | |
e47c8fc5 CP |
1734 | return rc; |
1735 | } | |
1736 | ||
3bb56b25 PM |
1737 | static int sel_make_policycap(void) |
1738 | { | |
1739 | unsigned int iter; | |
1740 | struct dentry *dentry = NULL; | |
1741 | struct inode *inode = NULL; | |
1742 | ||
1743 | sel_remove_entries(policycap_dir); | |
1744 | ||
1745 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
4dc2fce3 | 1746 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
3bb56b25 | 1747 | dentry = d_alloc_name(policycap_dir, |
4dc2fce3 | 1748 | selinux_policycap_names[iter]); |
3bb56b25 PM |
1749 | else |
1750 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1751 | ||
1752 | if (dentry == NULL) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1756 | if (inode == NULL) | |
1757 | return -ENOMEM; | |
1758 | ||
1759 | inode->i_fop = &sel_policycap_ops; | |
1760 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1761 | d_add(dentry, inode); | |
1762 | } | |
1763 | ||
1764 | return 0; | |
1765 | } | |
1766 | ||
a1c2aa1e | 1767 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1768 | unsigned long *ino) |
1da177e4 | 1769 | { |
a1c2aa1e | 1770 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1771 | struct inode *inode; |
1772 | ||
a1c2aa1e AV |
1773 | if (!dentry) |
1774 | return ERR_PTR(-ENOMEM); | |
1775 | ||
1776 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1777 | if (!inode) { | |
1778 | dput(dentry); | |
1779 | return ERR_PTR(-ENOMEM); | |
1780 | } | |
b77a493b | 1781 | |
1da177e4 LT |
1782 | inode->i_op = &simple_dir_inode_operations; |
1783 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1784 | inode->i_ino = ++(*ino); |
40e906f8 | 1785 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1786 | inc_nlink(inode); |
1da177e4 | 1787 | d_add(dentry, inode); |
edb20fb5 | 1788 | /* bump link count on parent directory, too */ |
ce0b16dd | 1789 | inc_nlink(d_inode(dir)); |
b77a493b | 1790 | |
a1c2aa1e | 1791 | return dentry; |
1da177e4 LT |
1792 | } |
1793 | ||
1872981b | 1794 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1795 | { |
1796 | int ret; | |
1797 | struct dentry *dentry; | |
a1c2aa1e | 1798 | struct inode *inode; |
1da177e4 LT |
1799 | struct inode_security_struct *isec; |
1800 | ||
cda37124 | 1801 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
1802 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
1803 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1804 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1805 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1806 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1807 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1808 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1809 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1810 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1811 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1812 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1813 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1814 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1815 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1816 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1817 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1818 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1819 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1820 | S_IWUGO}, | |
1da177e4 LT |
1821 | /* last one */ {""} |
1822 | }; | |
1823 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1824 | if (ret) | |
161ce45a | 1825 | goto err; |
1da177e4 | 1826 | |
a1c2aa1e AV |
1827 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1828 | if (IS_ERR(bool_dir)) { | |
1829 | ret = PTR_ERR(bool_dir); | |
1830 | bool_dir = NULL; | |
161ce45a | 1831 | goto err; |
a1c2aa1e | 1832 | } |
1da177e4 | 1833 | |
b77a493b | 1834 | ret = -ENOMEM; |
1da177e4 | 1835 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1836 | if (!dentry) |
161ce45a | 1837 | goto err; |
1da177e4 | 1838 | |
b77a493b | 1839 | ret = -ENOMEM; |
1da177e4 | 1840 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1841 | if (!inode) |
161ce45a | 1842 | goto err; |
b77a493b | 1843 | |
6174eafc | 1844 | inode->i_ino = ++sel_last_ino; |
1872981b | 1845 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1846 | isec->sid = SECINITSID_DEVNULL; |
1847 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1848 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1849 | |
1850 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1851 | d_add(dentry, inode); | |
765927b2 | 1852 | selinux_null.dentry = dentry; |
1da177e4 | 1853 | |
a1c2aa1e AV |
1854 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1855 | if (IS_ERR(dentry)) { | |
1856 | ret = PTR_ERR(dentry); | |
161ce45a | 1857 | goto err; |
a1c2aa1e | 1858 | } |
1da177e4 LT |
1859 | |
1860 | ret = sel_make_avc_files(dentry); | |
1861 | if (ret) | |
161ce45a | 1862 | goto err; |
f0ee2e46 | 1863 | |
a1c2aa1e AV |
1864 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1865 | if (IS_ERR(dentry)) { | |
1866 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1867 | goto err; |
a1c2aa1e | 1868 | } |
f0ee2e46 JC |
1869 | |
1870 | ret = sel_make_initcon_files(dentry); | |
1871 | if (ret) | |
1872 | goto err; | |
1873 | ||
a1c2aa1e AV |
1874 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1875 | if (IS_ERR(class_dir)) { | |
1876 | ret = PTR_ERR(class_dir); | |
1877 | class_dir = NULL; | |
3bb56b25 | 1878 | goto err; |
a1c2aa1e | 1879 | } |
3bb56b25 | 1880 | |
a1c2aa1e AV |
1881 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1882 | if (IS_ERR(policycap_dir)) { | |
1883 | ret = PTR_ERR(policycap_dir); | |
1884 | policycap_dir = NULL; | |
3bb56b25 | 1885 | goto err; |
a1c2aa1e | 1886 | } |
b77a493b | 1887 | return 0; |
161ce45a | 1888 | err: |
744ba35e EP |
1889 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1890 | __func__); | |
b77a493b | 1891 | return ret; |
1da177e4 LT |
1892 | } |
1893 | ||
fc14f2fe AV |
1894 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1895 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1896 | { |
fc14f2fe | 1897 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1898 | } |
1899 | ||
1900 | static struct file_system_type sel_fs_type = { | |
1901 | .name = "selinuxfs", | |
fc14f2fe | 1902 | .mount = sel_mount, |
1da177e4 LT |
1903 | .kill_sb = kill_litter_super, |
1904 | }; | |
1905 | ||
1906 | struct vfsmount *selinuxfs_mount; | |
1907 | ||
1908 | static int __init init_sel_fs(void) | |
1909 | { | |
1910 | int err; | |
1911 | ||
1912 | if (!selinux_enabled) | |
1913 | return 0; | |
7a627e3b | 1914 | |
f9bb4882 EB |
1915 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
1916 | if (err) | |
1917 | return err; | |
7a627e3b | 1918 | |
1da177e4 | 1919 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 1920 | if (err) { |
f9bb4882 | 1921 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 1922 | return err; |
7a627e3b | 1923 | } |
b77a493b | 1924 | |
765927b2 | 1925 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1926 | if (IS_ERR(selinuxfs_mount)) { |
1927 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1928 | err = PTR_ERR(selinuxfs_mount); | |
1929 | selinuxfs_mount = NULL; | |
1da177e4 | 1930 | } |
b77a493b | 1931 | |
1da177e4 LT |
1932 | return err; |
1933 | } | |
1934 | ||
1935 | __initcall(init_sel_fs); | |
1936 | ||
1937 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1938 | void exit_sel_fs(void) | |
1939 | { | |
f9bb4882 | 1940 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
423e0ab0 | 1941 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1942 | unregister_filesystem(&sel_fs_type); |
1943 | } | |
1944 | #endif |