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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 | ||
0b884d25 AV |
652 | req = memdup_user_nul(buf, count); |
653 | if (IS_ERR(req)) { | |
654 | rc = PTR_ERR(req); | |
655 | req = NULL; | |
f9df6458 | 656 | goto out; |
0b884d25 | 657 | } |
f9df6458 AP |
658 | |
659 | rc = -ENOMEM; | |
660 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
661 | if (!oldcon) | |
662 | goto out; | |
663 | ||
664 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
665 | if (!newcon) | |
666 | goto out; | |
667 | ||
668 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
669 | if (!taskcon) | |
670 | goto out; | |
671 | ||
672 | rc = -EINVAL; | |
673 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
674 | goto out; | |
675 | ||
676 | rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); | |
677 | if (rc) | |
678 | goto out; | |
679 | ||
680 | rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); | |
681 | if (rc) | |
682 | goto out; | |
683 | ||
684 | rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); | |
685 | if (rc) | |
686 | goto out; | |
687 | ||
688 | rc = security_validate_transition_user(osid, nsid, tsid, tclass); | |
689 | if (!rc) | |
690 | rc = count; | |
691 | out: | |
692 | kfree(req); | |
693 | kfree(oldcon); | |
694 | kfree(newcon); | |
695 | kfree(taskcon); | |
696 | return rc; | |
697 | } | |
698 | ||
699 | static const struct file_operations sel_transition_ops = { | |
700 | .write = sel_write_validatetrans, | |
701 | .llseek = generic_file_llseek, | |
702 | }; | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
706 | */ | |
1872981b EP |
707 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
708 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
709 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
710 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
711 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
712 | |
713 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
714 | [SEL_ACCESS] = sel_write_access, | |
715 | [SEL_CREATE] = sel_write_create, | |
716 | [SEL_RELABEL] = sel_write_relabel, | |
717 | [SEL_USER] = sel_write_user, | |
718 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 719 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
720 | }; |
721 | ||
722 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
723 | { | |
496ad9aa | 724 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
725 | char *data; |
726 | ssize_t rv; | |
727 | ||
6e20a64a | 728 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
729 | return -EINVAL; |
730 | ||
731 | data = simple_transaction_get(file, buf, size); | |
732 | if (IS_ERR(data)) | |
733 | return PTR_ERR(data); | |
734 | ||
1872981b EP |
735 | rv = write_op[ino](file, data, size); |
736 | if (rv > 0) { | |
1da177e4 LT |
737 | simple_transaction_set(file, rv); |
738 | rv = size; | |
739 | } | |
740 | return rv; | |
741 | } | |
742 | ||
9c2e08c5 | 743 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
744 | .write = selinux_transaction_write, |
745 | .read = simple_transaction_read, | |
746 | .release = simple_transaction_release, | |
57a62c23 | 747 | .llseek = generic_file_llseek, |
1da177e4 LT |
748 | }; |
749 | ||
750 | /* | |
751 | * payload - write methods | |
752 | * If the method has a response, the response should be put in buf, | |
753 | * and the length returned. Otherwise return 0 or and -error. | |
754 | */ | |
755 | ||
1872981b | 756 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 757 | { |
b77a493b | 758 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
759 | u32 ssid, tsid; |
760 | u16 tclass; | |
1da177e4 LT |
761 | struct av_decision avd; |
762 | ssize_t length; | |
763 | ||
be0554c9 SS |
764 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
765 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); | |
1da177e4 | 766 | if (length) |
b77a493b | 767 | goto out; |
1da177e4 LT |
768 | |
769 | length = -ENOMEM; | |
c1a7368a | 770 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 771 | if (!scon) |
b77a493b | 772 | goto out; |
1da177e4 | 773 | |
b77a493b | 774 | length = -ENOMEM; |
c1a7368a | 775 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
776 | if (!tcon) |
777 | goto out; | |
1da177e4 LT |
778 | |
779 | length = -EINVAL; | |
19439d05 | 780 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 781 | goto out; |
1da177e4 | 782 | |
44be2f65 | 783 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
784 | if (length) |
785 | goto out; | |
786 | ||
44be2f65 | 787 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
788 | if (length) |
789 | goto out; | |
1da177e4 | 790 | |
19439d05 | 791 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
792 | |
793 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 794 | "%x %x %x %x %u %x", |
f1c6381a | 795 | avd.allowed, 0xffffffff, |
1da177e4 | 796 | avd.auditallow, avd.auditdeny, |
8a6f83af | 797 | avd.seqno, avd.flags); |
1da177e4 | 798 | out: |
b77a493b | 799 | kfree(tcon); |
1da177e4 LT |
800 | kfree(scon); |
801 | return length; | |
802 | } | |
803 | ||
1872981b | 804 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 805 | { |
b77a493b | 806 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 807 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
808 | u32 ssid, tsid, newsid; |
809 | u16 tclass; | |
810 | ssize_t length; | |
b77a493b | 811 | char *newcon = NULL; |
1da177e4 | 812 | u32 len; |
f50a3ec9 | 813 | int nargs; |
1da177e4 | 814 | |
be0554c9 SS |
815 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
816 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, | |
817 | NULL); | |
1da177e4 | 818 | if (length) |
b77a493b | 819 | goto out; |
1da177e4 LT |
820 | |
821 | length = -ENOMEM; | |
c1a7368a | 822 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 823 | if (!scon) |
b77a493b | 824 | goto out; |
1da177e4 | 825 | |
b77a493b | 826 | length = -ENOMEM; |
c1a7368a | 827 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
828 | if (!tcon) |
829 | goto out; | |
1da177e4 | 830 | |
f50a3ec9 KK |
831 | length = -ENOMEM; |
832 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
833 | if (!namebuf) | |
834 | goto out; | |
835 | ||
1da177e4 | 836 | length = -EINVAL; |
f50a3ec9 KK |
837 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
838 | if (nargs < 3 || nargs > 4) | |
b77a493b | 839 | goto out; |
0f7e4c33 KK |
840 | if (nargs == 4) { |
841 | /* | |
842 | * If and when the name of new object to be queried contains | |
843 | * either whitespace or multibyte characters, they shall be | |
844 | * encoded based on the percentage-encoding rule. | |
845 | * If not encoded, the sscanf logic picks up only left-half | |
846 | * of the supplied name; splitted by a whitespace unexpectedly. | |
847 | */ | |
848 | char *r, *w; | |
849 | int c1, c2; | |
850 | ||
851 | r = w = namebuf; | |
852 | do { | |
853 | c1 = *r++; | |
854 | if (c1 == '+') | |
855 | c1 = ' '; | |
856 | else if (c1 == '%') { | |
af7ff2c2 AS |
857 | c1 = hex_to_bin(*r++); |
858 | if (c1 < 0) | |
0f7e4c33 | 859 | goto out; |
af7ff2c2 AS |
860 | c2 = hex_to_bin(*r++); |
861 | if (c2 < 0) | |
0f7e4c33 KK |
862 | goto out; |
863 | c1 = (c1 << 4) | c2; | |
864 | } | |
865 | *w++ = c1; | |
866 | } while (c1 != '\0'); | |
867 | ||
f50a3ec9 | 868 | objname = namebuf; |
0f7e4c33 | 869 | } |
1da177e4 | 870 | |
44be2f65 | 871 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
872 | if (length) |
873 | goto out; | |
874 | ||
44be2f65 | 875 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
876 | if (length) |
877 | goto out; | |
1da177e4 | 878 | |
f50a3ec9 KK |
879 | length = security_transition_sid_user(ssid, tsid, tclass, |
880 | objname, &newsid); | |
b77a493b EP |
881 | if (length) |
882 | goto out; | |
1da177e4 LT |
883 | |
884 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
885 | if (length) |
886 | goto out; | |
1da177e4 | 887 | |
b77a493b | 888 | length = -ERANGE; |
1da177e4 | 889 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
890 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
891 | "payload max\n", __func__, len); | |
b77a493b | 892 | goto out; |
1da177e4 LT |
893 | } |
894 | ||
895 | memcpy(buf, newcon, len); | |
896 | length = len; | |
b77a493b | 897 | out: |
1da177e4 | 898 | kfree(newcon); |
f50a3ec9 | 899 | kfree(namebuf); |
1da177e4 | 900 | kfree(tcon); |
1da177e4 LT |
901 | kfree(scon); |
902 | return length; | |
903 | } | |
904 | ||
1872981b | 905 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 906 | { |
b77a493b | 907 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
908 | u32 ssid, tsid, newsid; |
909 | u16 tclass; | |
910 | ssize_t length; | |
b77a493b | 911 | char *newcon = NULL; |
1da177e4 LT |
912 | u32 len; |
913 | ||
be0554c9 SS |
914 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
915 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, | |
916 | NULL); | |
1da177e4 | 917 | if (length) |
b77a493b | 918 | goto out; |
1da177e4 LT |
919 | |
920 | length = -ENOMEM; | |
c1a7368a | 921 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 922 | if (!scon) |
b77a493b | 923 | goto out; |
1da177e4 | 924 | |
b77a493b | 925 | length = -ENOMEM; |
c1a7368a | 926 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
927 | if (!tcon) |
928 | goto out; | |
1da177e4 LT |
929 | |
930 | length = -EINVAL; | |
931 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 932 | goto out; |
1da177e4 | 933 | |
44be2f65 | 934 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
935 | if (length) |
936 | goto out; | |
937 | ||
44be2f65 | 938 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
939 | if (length) |
940 | goto out; | |
1da177e4 LT |
941 | |
942 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
943 | if (length) |
944 | goto out; | |
1da177e4 LT |
945 | |
946 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
947 | if (length) |
948 | goto out; | |
1da177e4 | 949 | |
b77a493b EP |
950 | length = -ERANGE; |
951 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
952 | goto out; | |
1da177e4 LT |
953 | |
954 | memcpy(buf, newcon, len); | |
955 | length = len; | |
b77a493b | 956 | out: |
1da177e4 | 957 | kfree(newcon); |
1da177e4 | 958 | kfree(tcon); |
1da177e4 LT |
959 | kfree(scon); |
960 | return length; | |
961 | } | |
962 | ||
1872981b | 963 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 964 | { |
b77a493b EP |
965 | char *con = NULL, *user = NULL, *ptr; |
966 | u32 sid, *sids = NULL; | |
1da177e4 LT |
967 | ssize_t length; |
968 | char *newcon; | |
969 | int i, rc; | |
970 | u32 len, nsids; | |
971 | ||
be0554c9 SS |
972 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
973 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, | |
974 | NULL); | |
1da177e4 | 975 | if (length) |
6eab04a8 | 976 | goto out; |
1da177e4 LT |
977 | |
978 | length = -ENOMEM; | |
c1a7368a | 979 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 980 | if (!con) |
6eab04a8 | 981 | goto out; |
1da177e4 | 982 | |
b77a493b | 983 | length = -ENOMEM; |
c1a7368a | 984 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
985 | if (!user) |
986 | goto out; | |
1da177e4 LT |
987 | |
988 | length = -EINVAL; | |
989 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 990 | goto out; |
1da177e4 | 991 | |
44be2f65 | 992 | length = security_context_str_to_sid(con, &sid, GFP_KERNEL); |
b77a493b EP |
993 | if (length) |
994 | goto out; | |
1da177e4 LT |
995 | |
996 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
997 | if (length) |
998 | goto out; | |
1da177e4 LT |
999 | |
1000 | length = sprintf(buf, "%u", nsids) + 1; | |
1001 | ptr = buf + length; | |
1002 | for (i = 0; i < nsids; i++) { | |
1003 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
1004 | if (rc) { | |
1005 | length = rc; | |
b77a493b | 1006 | goto out; |
1da177e4 LT |
1007 | } |
1008 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1009 | kfree(newcon); | |
1010 | length = -ERANGE; | |
b77a493b | 1011 | goto out; |
1da177e4 LT |
1012 | } |
1013 | memcpy(ptr, newcon, len); | |
1014 | kfree(newcon); | |
1015 | ptr += len; | |
1016 | length += len; | |
1017 | } | |
b77a493b | 1018 | out: |
1da177e4 | 1019 | kfree(sids); |
1da177e4 | 1020 | kfree(user); |
1da177e4 LT |
1021 | kfree(con); |
1022 | return length; | |
1023 | } | |
1024 | ||
1872981b | 1025 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1026 | { |
b77a493b | 1027 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1028 | u32 ssid, tsid, newsid; |
1029 | u16 tclass; | |
1030 | ssize_t length; | |
b77a493b | 1031 | char *newcon = NULL; |
1da177e4 LT |
1032 | u32 len; |
1033 | ||
be0554c9 SS |
1034 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1035 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, | |
1036 | NULL); | |
1da177e4 | 1037 | if (length) |
b77a493b | 1038 | goto out; |
1da177e4 LT |
1039 | |
1040 | length = -ENOMEM; | |
c1a7368a | 1041 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1042 | if (!scon) |
6eab04a8 | 1043 | goto out; |
1da177e4 | 1044 | |
b77a493b | 1045 | length = -ENOMEM; |
c1a7368a | 1046 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1047 | if (!tcon) |
1048 | goto out; | |
1da177e4 LT |
1049 | |
1050 | length = -EINVAL; | |
1051 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1052 | goto out; |
1da177e4 | 1053 | |
44be2f65 | 1054 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1055 | if (length) |
1056 | goto out; | |
1057 | ||
44be2f65 | 1058 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1059 | if (length) |
1060 | goto out; | |
1da177e4 LT |
1061 | |
1062 | length = security_member_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
1063 | if (length) |
1064 | goto out; | |
1da177e4 LT |
1065 | |
1066 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
1067 | if (length) |
1068 | goto out; | |
1da177e4 | 1069 | |
b77a493b | 1070 | length = -ERANGE; |
1da177e4 | 1071 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
1072 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
1073 | "payload max\n", __func__, len); | |
b77a493b | 1074 | goto out; |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | memcpy(buf, newcon, len); | |
1078 | length = len; | |
b77a493b | 1079 | out: |
1da177e4 | 1080 | kfree(newcon); |
1da177e4 | 1081 | kfree(tcon); |
1da177e4 LT |
1082 | kfree(scon); |
1083 | return length; | |
1084 | } | |
1085 | ||
1086 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1087 | { | |
1088 | struct inode *ret = new_inode(sb); | |
1089 | ||
1090 | if (ret) { | |
1091 | ret->i_mode = mode; | |
078cd827 | 1092 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1093 | } |
1094 | return ret; | |
1095 | } | |
1096 | ||
1da177e4 LT |
1097 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1098 | size_t count, loff_t *ppos) | |
1099 | { | |
1100 | char *page = NULL; | |
1101 | ssize_t length; | |
1da177e4 LT |
1102 | ssize_t ret; |
1103 | int cur_enforcing; | |
496ad9aa | 1104 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1105 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1106 | |
bb003079 | 1107 | mutex_lock(&sel_mutex); |
1da177e4 | 1108 | |
b77a493b EP |
1109 | ret = -EINVAL; |
1110 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1111 | goto out; |
1da177e4 | 1112 | |
b77a493b | 1113 | ret = -ENOMEM; |
1872981b | 1114 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1115 | if (!page) |
1da177e4 | 1116 | goto out; |
1da177e4 | 1117 | |
d313f948 | 1118 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1119 | if (cur_enforcing < 0) { |
1120 | ret = cur_enforcing; | |
1121 | goto out; | |
1122 | } | |
1da177e4 | 1123 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
d313f948 | 1124 | bool_pending_values[index]); |
68bdcf28 | 1125 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1da177e4 | 1126 | out: |
bb003079 | 1127 | mutex_unlock(&sel_mutex); |
b77a493b | 1128 | free_page((unsigned long)page); |
1da177e4 LT |
1129 | return ret; |
1130 | } | |
1131 | ||
1132 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1133 | size_t count, loff_t *ppos) | |
1134 | { | |
1135 | char *page = NULL; | |
d313f948 | 1136 | ssize_t length; |
1da177e4 | 1137 | int new_value; |
496ad9aa | 1138 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1139 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1140 | |
bb003079 | 1141 | mutex_lock(&sel_mutex); |
1da177e4 | 1142 | |
be0554c9 SS |
1143 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1144 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1145 | NULL); | |
1da177e4 LT |
1146 | if (length) |
1147 | goto out; | |
1148 | ||
b77a493b EP |
1149 | length = -EINVAL; |
1150 | if (index >= bool_num || strcmp(name, bool_pending_names[index])) | |
d313f948 | 1151 | goto out; |
d313f948 | 1152 | |
b77a493b EP |
1153 | length = -ENOMEM; |
1154 | if (count >= PAGE_SIZE) | |
1da177e4 | 1155 | goto out; |
d313f948 | 1156 | |
b77a493b EP |
1157 | /* No partial writes. */ |
1158 | length = -EINVAL; | |
1159 | if (*ppos != 0) | |
1da177e4 | 1160 | goto out; |
b77a493b | 1161 | |
8365a719 AV |
1162 | page = memdup_user_nul(buf, count); |
1163 | if (IS_ERR(page)) { | |
1164 | length = PTR_ERR(page); | |
1165 | page = NULL; | |
1da177e4 | 1166 | goto out; |
8365a719 | 1167 | } |
1da177e4 LT |
1168 | |
1169 | length = -EINVAL; | |
1170 | if (sscanf(page, "%d", &new_value) != 1) | |
1171 | goto out; | |
1172 | ||
1173 | if (new_value) | |
1174 | new_value = 1; | |
1175 | ||
d313f948 | 1176 | bool_pending_values[index] = new_value; |
1da177e4 LT |
1177 | length = count; |
1178 | ||
1179 | out: | |
bb003079 | 1180 | mutex_unlock(&sel_mutex); |
8365a719 | 1181 | kfree(page); |
1da177e4 LT |
1182 | return length; |
1183 | } | |
1184 | ||
9c2e08c5 | 1185 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1186 | .read = sel_read_bool, |
1187 | .write = sel_write_bool, | |
57a62c23 | 1188 | .llseek = generic_file_llseek, |
1da177e4 LT |
1189 | }; |
1190 | ||
1191 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1192 | const char __user *buf, | |
1193 | size_t count, loff_t *ppos) | |
1194 | { | |
1195 | char *page = NULL; | |
d313f948 | 1196 | ssize_t length; |
1da177e4 LT |
1197 | int new_value; |
1198 | ||
bb003079 | 1199 | mutex_lock(&sel_mutex); |
1da177e4 | 1200 | |
be0554c9 SS |
1201 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1202 | SECCLASS_SECURITY, SECURITY__SETBOOL, | |
1203 | NULL); | |
1da177e4 LT |
1204 | if (length) |
1205 | goto out; | |
1206 | ||
b77a493b EP |
1207 | length = -ENOMEM; |
1208 | if (count >= PAGE_SIZE) | |
1da177e4 | 1209 | goto out; |
b77a493b EP |
1210 | |
1211 | /* No partial writes. */ | |
1212 | length = -EINVAL; | |
1213 | if (*ppos != 0) | |
1da177e4 | 1214 | goto out; |
b77a493b | 1215 | |
8365a719 AV |
1216 | page = memdup_user_nul(buf, count); |
1217 | if (IS_ERR(page)) { | |
1218 | length = PTR_ERR(page); | |
1219 | page = NULL; | |
1da177e4 | 1220 | goto out; |
8365a719 | 1221 | } |
1da177e4 LT |
1222 | |
1223 | length = -EINVAL; | |
1224 | if (sscanf(page, "%d", &new_value) != 1) | |
1225 | goto out; | |
1226 | ||
b77a493b | 1227 | length = 0; |
1872981b | 1228 | if (new_value && bool_pending_values) |
b77a493b | 1229 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1230 | |
b77a493b EP |
1231 | if (!length) |
1232 | length = count; | |
1da177e4 LT |
1233 | |
1234 | out: | |
bb003079 | 1235 | mutex_unlock(&sel_mutex); |
8365a719 | 1236 | kfree(page); |
1da177e4 LT |
1237 | return length; |
1238 | } | |
1239 | ||
9c2e08c5 | 1240 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1241 | .write = sel_commit_bools_write, |
57a62c23 | 1242 | .llseek = generic_file_llseek, |
1da177e4 LT |
1243 | }; |
1244 | ||
0c92d7c7 | 1245 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1246 | { |
ad52184b AV |
1247 | d_genocide(de); |
1248 | shrink_dcache_parent(de); | |
1da177e4 LT |
1249 | } |
1250 | ||
1251 | #define BOOL_DIR_NAME "booleans" | |
1252 | ||
1253 | static int sel_make_bools(void) | |
1254 | { | |
b77a493b | 1255 | int i, ret; |
1da177e4 LT |
1256 | ssize_t len; |
1257 | struct dentry *dentry = NULL; | |
1258 | struct dentry *dir = bool_dir; | |
1259 | struct inode *inode = NULL; | |
1260 | struct inode_security_struct *isec; | |
1261 | char **names = NULL, *page; | |
1262 | int num; | |
1263 | int *values = NULL; | |
1264 | u32 sid; | |
1265 | ||
1266 | /* remove any existing files */ | |
8007f102 XF |
1267 | for (i = 0; i < bool_num; i++) |
1268 | kfree(bool_pending_names[i]); | |
d313f948 | 1269 | kfree(bool_pending_names); |
9a5f04bf | 1270 | kfree(bool_pending_values); |
154c50ca | 1271 | bool_num = 0; |
d313f948 | 1272 | bool_pending_names = NULL; |
20c19e41 | 1273 | bool_pending_values = NULL; |
1da177e4 | 1274 | |
0c92d7c7 | 1275 | sel_remove_entries(dir); |
1da177e4 | 1276 | |
b77a493b | 1277 | ret = -ENOMEM; |
1872981b EP |
1278 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1279 | if (!page) | |
b77a493b | 1280 | goto out; |
1da177e4 LT |
1281 | |
1282 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1283 | if (ret) |
1da177e4 LT |
1284 | goto out; |
1285 | ||
1286 | for (i = 0; i < num; i++) { | |
b77a493b | 1287 | ret = -ENOMEM; |
1da177e4 | 1288 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1289 | if (!dentry) |
1290 | goto out; | |
1291 | ||
1292 | ret = -ENOMEM; | |
1da177e4 | 1293 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1294 | if (!inode) |
1295 | goto out; | |
1da177e4 | 1296 | |
b77a493b | 1297 | ret = -ENAMETOOLONG; |
cc1dad71 | 1298 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1299 | if (len >= PAGE_SIZE) |
1300 | goto out; | |
1301 | ||
1872981b EP |
1302 | isec = (struct inode_security_struct *)inode->i_security; |
1303 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
4262fb51 | 1304 | if (ret) { |
900fde06 GT |
1305 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1306 | page); | |
1307 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1308 | } |
1309 | ||
1da177e4 | 1310 | isec->sid = sid; |
42059112 | 1311 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1312 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1313 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1314 | d_add(dentry, inode); |
1315 | } | |
1316 | bool_num = num; | |
d313f948 | 1317 | bool_pending_names = names; |
1da177e4 | 1318 | bool_pending_values = values; |
b77a493b EP |
1319 | |
1320 | free_page((unsigned long)page); | |
1321 | return 0; | |
1da177e4 LT |
1322 | out: |
1323 | free_page((unsigned long)page); | |
b77a493b | 1324 | |
1da177e4 | 1325 | if (names) { |
9a5f04bf JJ |
1326 | for (i = 0; i < num; i++) |
1327 | kfree(names[i]); | |
1da177e4 LT |
1328 | kfree(names); |
1329 | } | |
20c19e41 | 1330 | kfree(values); |
0c92d7c7 | 1331 | sel_remove_entries(dir); |
b77a493b EP |
1332 | |
1333 | return ret; | |
1da177e4 LT |
1334 | } |
1335 | ||
1336 | #define NULL_FILE_NAME "null" | |
1337 | ||
765927b2 | 1338 | struct path selinux_null; |
1da177e4 LT |
1339 | |
1340 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1341 | size_t count, loff_t *ppos) | |
1342 | { | |
1343 | char tmpbuf[TMPBUFLEN]; | |
1344 | ssize_t length; | |
1345 | ||
1346 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1347 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1348 | } | |
1349 | ||
1872981b EP |
1350 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1351 | const char __user *buf, | |
1da177e4 LT |
1352 | size_t count, loff_t *ppos) |
1353 | ||
1354 | { | |
8365a719 | 1355 | char *page; |
1da177e4 | 1356 | ssize_t ret; |
309c5fad | 1357 | unsigned int new_value; |
1da177e4 | 1358 | |
be0554c9 SS |
1359 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
1360 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, | |
1361 | NULL); | |
b77a493b | 1362 | if (ret) |
8365a719 | 1363 | return ret; |
1da177e4 | 1364 | |
b77a493b | 1365 | if (count >= PAGE_SIZE) |
8365a719 | 1366 | return -ENOMEM; |
1da177e4 | 1367 | |
b77a493b | 1368 | /* No partial writes. */ |
b77a493b | 1369 | if (*ppos != 0) |
8365a719 | 1370 | return -EINVAL; |
1da177e4 | 1371 | |
8365a719 AV |
1372 | page = memdup_user_nul(buf, count); |
1373 | if (IS_ERR(page)) | |
1374 | return PTR_ERR(page); | |
1da177e4 | 1375 | |
b77a493b EP |
1376 | ret = -EINVAL; |
1377 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1378 | goto out; |
1da177e4 | 1379 | |
b77a493b EP |
1380 | avc_cache_threshold = new_value; |
1381 | ||
1da177e4 | 1382 | ret = count; |
1da177e4 | 1383 | out: |
8365a719 | 1384 | kfree(page); |
1da177e4 LT |
1385 | return ret; |
1386 | } | |
1387 | ||
1388 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1389 | size_t count, loff_t *ppos) | |
1390 | { | |
1391 | char *page; | |
b77a493b | 1392 | ssize_t length; |
1da177e4 LT |
1393 | |
1394 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1395 | if (!page) |
1396 | return -ENOMEM; | |
1397 | ||
1398 | length = avc_get_hash_stats(page); | |
1399 | if (length >= 0) | |
1400 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1401 | free_page((unsigned long)page); |
b77a493b EP |
1402 | |
1403 | return length; | |
1da177e4 LT |
1404 | } |
1405 | ||
9c2e08c5 | 1406 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1407 | .read = sel_read_avc_cache_threshold, |
1408 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1409 | .llseek = generic_file_llseek, |
1da177e4 LT |
1410 | }; |
1411 | ||
9c2e08c5 | 1412 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1413 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1414 | .llseek = generic_file_llseek, |
1da177e4 LT |
1415 | }; |
1416 | ||
1417 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1418 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1419 | { | |
1420 | int cpu; | |
1421 | ||
4f4b6c1a | 1422 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1423 | if (!cpu_possible(cpu)) |
1424 | continue; | |
1425 | *idx = cpu + 1; | |
1426 | return &per_cpu(avc_cache_stats, cpu); | |
1427 | } | |
1428 | return NULL; | |
1429 | } | |
1430 | ||
1431 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1432 | { | |
1433 | loff_t n = *pos - 1; | |
1434 | ||
1435 | if (*pos == 0) | |
1436 | return SEQ_START_TOKEN; | |
1437 | ||
1438 | return sel_avc_get_stat_idx(&n); | |
1439 | } | |
1440 | ||
1441 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1442 | { | |
1443 | return sel_avc_get_stat_idx(pos); | |
1444 | } | |
1445 | ||
1446 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1447 | { | |
1448 | struct avc_cache_stats *st = v; | |
1449 | ||
710a0647 ME |
1450 | if (v == SEQ_START_TOKEN) { |
1451 | seq_puts(seq, | |
1452 | "lookups hits misses allocations reclaims frees\n"); | |
1453 | } else { | |
257313b2 LT |
1454 | unsigned int lookups = st->lookups; |
1455 | unsigned int misses = st->misses; | |
1456 | unsigned int hits = lookups - misses; | |
1457 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1458 | hits, misses, st->allocations, | |
1da177e4 | 1459 | st->reclaims, st->frees); |
257313b2 | 1460 | } |
1da177e4 LT |
1461 | return 0; |
1462 | } | |
1463 | ||
1464 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1465 | { } | |
1466 | ||
1996a109 | 1467 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1468 | .start = sel_avc_stats_seq_start, |
1469 | .next = sel_avc_stats_seq_next, | |
1470 | .show = sel_avc_stats_seq_show, | |
1471 | .stop = sel_avc_stats_seq_stop, | |
1472 | }; | |
1473 | ||
1474 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1475 | { | |
1476 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1477 | } | |
1478 | ||
9c2e08c5 | 1479 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1480 | .open = sel_open_avc_cache_stats, |
1481 | .read = seq_read, | |
1482 | .llseek = seq_lseek, | |
1483 | .release = seq_release, | |
1484 | }; | |
1485 | #endif | |
1486 | ||
1487 | static int sel_make_avc_files(struct dentry *dir) | |
1488 | { | |
b77a493b | 1489 | int i; |
cda37124 | 1490 | static const struct tree_descr files[] = { |
1da177e4 LT |
1491 | { "cache_threshold", |
1492 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1493 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1494 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1495 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1496 | #endif | |
1497 | }; | |
1498 | ||
6e20a64a | 1499 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1500 | struct inode *inode; |
1501 | struct dentry *dentry; | |
1502 | ||
1503 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1504 | if (!dentry) |
1505 | return -ENOMEM; | |
1da177e4 LT |
1506 | |
1507 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1508 | if (!inode) |
1509 | return -ENOMEM; | |
1510 | ||
1da177e4 | 1511 | inode->i_fop = files[i].ops; |
6174eafc | 1512 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1513 | d_add(dentry, inode); |
1514 | } | |
b77a493b EP |
1515 | |
1516 | return 0; | |
1da177e4 LT |
1517 | } |
1518 | ||
1872981b | 1519 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1520 | size_t count, loff_t *ppos) |
1521 | { | |
f0ee2e46 JC |
1522 | char *con; |
1523 | u32 sid, len; | |
1524 | ssize_t ret; | |
1525 | ||
496ad9aa | 1526 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1527 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1528 | if (ret) |
f0ee2e46 JC |
1529 | return ret; |
1530 | ||
1531 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1532 | kfree(con); | |
1533 | return ret; | |
1534 | } | |
1535 | ||
1536 | static const struct file_operations sel_initcon_ops = { | |
1537 | .read = sel_read_initcon, | |
57a62c23 | 1538 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1539 | }; |
1540 | ||
1541 | static int sel_make_initcon_files(struct dentry *dir) | |
1542 | { | |
b77a493b | 1543 | int i; |
f0ee2e46 JC |
1544 | |
1545 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1546 | struct inode *inode; | |
1547 | struct dentry *dentry; | |
1548 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1549 | if (!dentry) |
1550 | return -ENOMEM; | |
f0ee2e46 JC |
1551 | |
1552 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1553 | if (!inode) |
1554 | return -ENOMEM; | |
1555 | ||
f0ee2e46 JC |
1556 | inode->i_fop = &sel_initcon_ops; |
1557 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1558 | d_add(dentry, inode); | |
1559 | } | |
b77a493b EP |
1560 | |
1561 | return 0; | |
f0ee2e46 JC |
1562 | } |
1563 | ||
e47c8fc5 CP |
1564 | static inline unsigned long sel_class_to_ino(u16 class) |
1565 | { | |
1566 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1567 | } | |
1568 | ||
1569 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1570 | { | |
92ae9e82 | 1571 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1572 | } |
1573 | ||
1574 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1575 | { | |
1576 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1577 | } | |
1578 | ||
1579 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1580 | { | |
1581 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1582 | } | |
1583 | ||
1872981b | 1584 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1585 | size_t count, loff_t *ppos) |
1586 | { | |
496ad9aa | 1587 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1588 | char res[TMPBUFLEN]; |
1589 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1590 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1591 | } |
1592 | ||
1593 | static const struct file_operations sel_class_ops = { | |
1594 | .read = sel_read_class, | |
57a62c23 | 1595 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1596 | }; |
1597 | ||
1872981b | 1598 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1599 | size_t count, loff_t *ppos) |
1600 | { | |
496ad9aa | 1601 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1602 | char res[TMPBUFLEN]; |
1603 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1604 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1605 | } |
1606 | ||
1607 | static const struct file_operations sel_perm_ops = { | |
1608 | .read = sel_read_perm, | |
57a62c23 | 1609 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1610 | }; |
1611 | ||
3bb56b25 PM |
1612 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1613 | size_t count, loff_t *ppos) | |
1614 | { | |
1615 | int value; | |
1616 | char tmpbuf[TMPBUFLEN]; | |
1617 | ssize_t length; | |
496ad9aa | 1618 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1619 | |
1620 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1621 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1622 | ||
1623 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1624 | } | |
1625 | ||
1626 | static const struct file_operations sel_policycap_ops = { | |
1627 | .read = sel_read_policycap, | |
57a62c23 | 1628 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1629 | }; |
1630 | ||
e47c8fc5 CP |
1631 | static int sel_make_perm_files(char *objclass, int classvalue, |
1632 | struct dentry *dir) | |
1633 | { | |
b77a493b | 1634 | int i, rc, nperms; |
e47c8fc5 CP |
1635 | char **perms; |
1636 | ||
1637 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1638 | if (rc) | |
b77a493b | 1639 | return rc; |
e47c8fc5 CP |
1640 | |
1641 | for (i = 0; i < nperms; i++) { | |
1642 | struct inode *inode; | |
1643 | struct dentry *dentry; | |
1644 | ||
b77a493b | 1645 | rc = -ENOMEM; |
e47c8fc5 | 1646 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1647 | if (!dentry) |
1648 | goto out; | |
e47c8fc5 | 1649 | |
b77a493b | 1650 | rc = -ENOMEM; |
e47c8fc5 | 1651 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1652 | if (!inode) |
1653 | goto out; | |
1654 | ||
e47c8fc5 CP |
1655 | inode->i_fop = &sel_perm_ops; |
1656 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1657 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1658 | d_add(dentry, inode); |
1659 | } | |
b77a493b EP |
1660 | rc = 0; |
1661 | out: | |
e47c8fc5 CP |
1662 | for (i = 0; i < nperms; i++) |
1663 | kfree(perms[i]); | |
1664 | kfree(perms); | |
e47c8fc5 CP |
1665 | return rc; |
1666 | } | |
1667 | ||
1668 | static int sel_make_class_dir_entries(char *classname, int index, | |
1669 | struct dentry *dir) | |
1670 | { | |
1671 | struct dentry *dentry = NULL; | |
1672 | struct inode *inode = NULL; | |
1673 | int rc; | |
1674 | ||
1675 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1676 | if (!dentry) |
1677 | return -ENOMEM; | |
e47c8fc5 CP |
1678 | |
1679 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1680 | if (!inode) |
1681 | return -ENOMEM; | |
e47c8fc5 CP |
1682 | |
1683 | inode->i_fop = &sel_class_ops; | |
1684 | inode->i_ino = sel_class_to_ino(index); | |
1685 | d_add(dentry, inode); | |
1686 | ||
a1c2aa1e AV |
1687 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1688 | if (IS_ERR(dentry)) | |
1689 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1690 | |
1691 | rc = sel_make_perm_files(classname, index, dentry); | |
1692 | ||
e47c8fc5 CP |
1693 | return rc; |
1694 | } | |
1695 | ||
e47c8fc5 CP |
1696 | static int sel_make_classes(void) |
1697 | { | |
b77a493b | 1698 | int rc, nclasses, i; |
e47c8fc5 CP |
1699 | char **classes; |
1700 | ||
1701 | /* delete any existing entries */ | |
ad52184b | 1702 | sel_remove_entries(class_dir); |
e47c8fc5 CP |
1703 | |
1704 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1705 | if (rc) |
1706 | return rc; | |
e47c8fc5 CP |
1707 | |
1708 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1709 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1710 | |
1711 | for (i = 0; i < nclasses; i++) { | |
1712 | struct dentry *class_name_dir; | |
1713 | ||
a1c2aa1e | 1714 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1715 | &last_class_ino); |
a1c2aa1e AV |
1716 | if (IS_ERR(class_name_dir)) { |
1717 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1718 | goto out; |
a1c2aa1e | 1719 | } |
e47c8fc5 CP |
1720 | |
1721 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1722 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1723 | class_name_dir); |
1724 | if (rc) | |
b77a493b | 1725 | goto out; |
e47c8fc5 | 1726 | } |
b77a493b EP |
1727 | rc = 0; |
1728 | out: | |
e47c8fc5 CP |
1729 | for (i = 0; i < nclasses; i++) |
1730 | kfree(classes[i]); | |
1731 | kfree(classes); | |
e47c8fc5 CP |
1732 | return rc; |
1733 | } | |
1734 | ||
3bb56b25 PM |
1735 | static int sel_make_policycap(void) |
1736 | { | |
1737 | unsigned int iter; | |
1738 | struct dentry *dentry = NULL; | |
1739 | struct inode *inode = NULL; | |
1740 | ||
1741 | sel_remove_entries(policycap_dir); | |
1742 | ||
1743 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
4dc2fce3 | 1744 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
3bb56b25 | 1745 | dentry = d_alloc_name(policycap_dir, |
4dc2fce3 | 1746 | selinux_policycap_names[iter]); |
3bb56b25 PM |
1747 | else |
1748 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1749 | ||
1750 | if (dentry == NULL) | |
1751 | return -ENOMEM; | |
1752 | ||
1753 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1754 | if (inode == NULL) | |
1755 | return -ENOMEM; | |
1756 | ||
1757 | inode->i_fop = &sel_policycap_ops; | |
1758 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1759 | d_add(dentry, inode); | |
1760 | } | |
1761 | ||
1762 | return 0; | |
1763 | } | |
1764 | ||
a1c2aa1e | 1765 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1766 | unsigned long *ino) |
1da177e4 | 1767 | { |
a1c2aa1e | 1768 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1769 | struct inode *inode; |
1770 | ||
a1c2aa1e AV |
1771 | if (!dentry) |
1772 | return ERR_PTR(-ENOMEM); | |
1773 | ||
1774 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1775 | if (!inode) { | |
1776 | dput(dentry); | |
1777 | return ERR_PTR(-ENOMEM); | |
1778 | } | |
b77a493b | 1779 | |
1da177e4 LT |
1780 | inode->i_op = &simple_dir_inode_operations; |
1781 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1782 | inode->i_ino = ++(*ino); |
40e906f8 | 1783 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1784 | inc_nlink(inode); |
1da177e4 | 1785 | d_add(dentry, inode); |
edb20fb5 | 1786 | /* bump link count on parent directory, too */ |
ce0b16dd | 1787 | inc_nlink(d_inode(dir)); |
b77a493b | 1788 | |
a1c2aa1e | 1789 | return dentry; |
1da177e4 LT |
1790 | } |
1791 | ||
1872981b | 1792 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1793 | { |
1794 | int ret; | |
1795 | struct dentry *dentry; | |
a1c2aa1e | 1796 | struct inode *inode; |
1da177e4 LT |
1797 | struct inode_security_struct *isec; |
1798 | ||
cda37124 | 1799 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
1800 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
1801 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1802 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1803 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1804 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1805 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1806 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1807 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1808 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1809 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1810 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1811 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1812 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1813 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1814 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1815 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1816 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1817 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1818 | S_IWUGO}, | |
1da177e4 LT |
1819 | /* last one */ {""} |
1820 | }; | |
1821 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1822 | if (ret) | |
161ce45a | 1823 | goto err; |
1da177e4 | 1824 | |
a1c2aa1e AV |
1825 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1826 | if (IS_ERR(bool_dir)) { | |
1827 | ret = PTR_ERR(bool_dir); | |
1828 | bool_dir = NULL; | |
161ce45a | 1829 | goto err; |
a1c2aa1e | 1830 | } |
1da177e4 | 1831 | |
b77a493b | 1832 | ret = -ENOMEM; |
1da177e4 | 1833 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1834 | if (!dentry) |
161ce45a | 1835 | goto err; |
1da177e4 | 1836 | |
b77a493b | 1837 | ret = -ENOMEM; |
1da177e4 | 1838 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1839 | if (!inode) |
161ce45a | 1840 | goto err; |
b77a493b | 1841 | |
6174eafc | 1842 | inode->i_ino = ++sel_last_ino; |
1872981b | 1843 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1844 | isec->sid = SECINITSID_DEVNULL; |
1845 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1846 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1847 | |
1848 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1849 | d_add(dentry, inode); | |
765927b2 | 1850 | selinux_null.dentry = dentry; |
1da177e4 | 1851 | |
a1c2aa1e AV |
1852 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1853 | if (IS_ERR(dentry)) { | |
1854 | ret = PTR_ERR(dentry); | |
161ce45a | 1855 | goto err; |
a1c2aa1e | 1856 | } |
1da177e4 LT |
1857 | |
1858 | ret = sel_make_avc_files(dentry); | |
1859 | if (ret) | |
161ce45a | 1860 | goto err; |
f0ee2e46 | 1861 | |
a1c2aa1e AV |
1862 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1863 | if (IS_ERR(dentry)) { | |
1864 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1865 | goto err; |
a1c2aa1e | 1866 | } |
f0ee2e46 JC |
1867 | |
1868 | ret = sel_make_initcon_files(dentry); | |
1869 | if (ret) | |
1870 | goto err; | |
1871 | ||
a1c2aa1e AV |
1872 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1873 | if (IS_ERR(class_dir)) { | |
1874 | ret = PTR_ERR(class_dir); | |
1875 | class_dir = NULL; | |
3bb56b25 | 1876 | goto err; |
a1c2aa1e | 1877 | } |
3bb56b25 | 1878 | |
a1c2aa1e AV |
1879 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1880 | if (IS_ERR(policycap_dir)) { | |
1881 | ret = PTR_ERR(policycap_dir); | |
1882 | policycap_dir = NULL; | |
3bb56b25 | 1883 | goto err; |
a1c2aa1e | 1884 | } |
b77a493b | 1885 | return 0; |
161ce45a | 1886 | err: |
744ba35e EP |
1887 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1888 | __func__); | |
b77a493b | 1889 | return ret; |
1da177e4 LT |
1890 | } |
1891 | ||
fc14f2fe AV |
1892 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1893 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1894 | { |
fc14f2fe | 1895 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1896 | } |
1897 | ||
1898 | static struct file_system_type sel_fs_type = { | |
1899 | .name = "selinuxfs", | |
fc14f2fe | 1900 | .mount = sel_mount, |
1da177e4 LT |
1901 | .kill_sb = kill_litter_super, |
1902 | }; | |
1903 | ||
1904 | struct vfsmount *selinuxfs_mount; | |
1905 | ||
1906 | static int __init init_sel_fs(void) | |
1907 | { | |
1908 | int err; | |
1909 | ||
1910 | if (!selinux_enabled) | |
1911 | return 0; | |
7a627e3b | 1912 | |
f9bb4882 EB |
1913 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
1914 | if (err) | |
1915 | return err; | |
7a627e3b | 1916 | |
1da177e4 | 1917 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 1918 | if (err) { |
f9bb4882 | 1919 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 1920 | return err; |
7a627e3b | 1921 | } |
b77a493b | 1922 | |
765927b2 | 1923 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1924 | if (IS_ERR(selinuxfs_mount)) { |
1925 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1926 | err = PTR_ERR(selinuxfs_mount); | |
1927 | selinuxfs_mount = NULL; | |
1da177e4 | 1928 | } |
b77a493b | 1929 | |
1da177e4 LT |
1930 | return err; |
1931 | } | |
1932 | ||
1933 | __initcall(init_sel_fs); | |
1934 | ||
1935 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1936 | void exit_sel_fs(void) | |
1937 | { | |
f9bb4882 | 1938 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
423e0ab0 | 1939 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1940 | unregister_filesystem(&sel_fs_type); |
1941 | } | |
1942 | #endif |