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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 | ||
3bb56b25 PM |
44 | /* Policy capability filenames */ |
45 | static char *policycap_names[] = { | |
b0c636b9 | 46 | "network_peer_controls", |
2be4d74f CP |
47 | "open_perms", |
48 | "redhat1", | |
49 | "always_check_network" | |
3bb56b25 PM |
50 | }; |
51 | ||
1da177e4 LT |
52 | unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE; |
53 | ||
54 | static int __init checkreqprot_setup(char *str) | |
55 | { | |
f5269710 | 56 | unsigned long checkreqprot; |
29707b20 | 57 | if (!kstrtoul(str, 0, &checkreqprot)) |
f5269710 | 58 | selinux_checkreqprot = checkreqprot ? 1 : 0; |
1da177e4 LT |
59 | return 1; |
60 | } | |
61 | __setup("checkreqprot=", checkreqprot_setup); | |
62 | ||
bb003079 | 63 | static DEFINE_MUTEX(sel_mutex); |
1da177e4 LT |
64 | |
65 | /* global data for booleans */ | |
1872981b EP |
66 | static struct dentry *bool_dir; |
67 | static int bool_num; | |
d313f948 | 68 | static char **bool_pending_names; |
1872981b | 69 | static int *bool_pending_values; |
1da177e4 | 70 | |
e47c8fc5 | 71 | /* global data for classes */ |
1872981b | 72 | static struct dentry *class_dir; |
e47c8fc5 CP |
73 | static unsigned long last_class_ino; |
74 | ||
cee74f47 EP |
75 | static char policy_opened; |
76 | ||
3bb56b25 | 77 | /* global data for policy capabilities */ |
1872981b | 78 | static struct dentry *policycap_dir; |
3bb56b25 | 79 | |
1da177e4 LT |
80 | /* Check whether a task is allowed to use a security operation. */ |
81 | static int task_has_security(struct task_struct *tsk, | |
82 | u32 perms) | |
83 | { | |
c69e8d9c DH |
84 | const struct task_security_struct *tsec; |
85 | u32 sid = 0; | |
86 | ||
87 | rcu_read_lock(); | |
88 | tsec = __task_cred(tsk)->security; | |
89 | if (tsec) | |
90 | sid = tsec->sid; | |
91 | rcu_read_unlock(); | |
1da177e4 LT |
92 | if (!tsec) |
93 | return -EACCES; | |
94 | ||
c69e8d9c | 95 | return avc_has_perm(sid, SECINITSID_SECURITY, |
1da177e4 LT |
96 | SECCLASS_SECURITY, perms, NULL); |
97 | } | |
98 | ||
99 | enum sel_inos { | |
100 | SEL_ROOT_INO = 2, | |
101 | SEL_LOAD, /* load policy */ | |
102 | SEL_ENFORCE, /* get or set enforcing status */ | |
103 | SEL_CONTEXT, /* validate context */ | |
104 | SEL_ACCESS, /* compute access decision */ | |
105 | SEL_CREATE, /* compute create labeling decision */ | |
106 | SEL_RELABEL, /* compute relabeling decision */ | |
107 | SEL_USER, /* compute reachable user contexts */ | |
108 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
109 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
110 | SEL_MLS, /* return if MLS policy is enabled */ | |
111 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
112 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
113 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 114 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
115 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
116 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 117 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 118 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 119 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 120 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
121 | }; |
122 | ||
6174eafc JC |
123 | static unsigned long sel_last_ino = SEL_INO_NEXT - 1; |
124 | ||
3bb56b25 PM |
125 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
126 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
127 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
128 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
129 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 130 | |
1da177e4 LT |
131 | #define TMPBUFLEN 12 |
132 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
133 | size_t count, loff_t *ppos) | |
134 | { | |
135 | char tmpbuf[TMPBUFLEN]; | |
136 | ssize_t length; | |
137 | ||
138 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing); | |
139 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
140 | } | |
141 | ||
142 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 143 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
144 | size_t count, loff_t *ppos) |
145 | ||
146 | { | |
b77a493b | 147 | char *page = NULL; |
1da177e4 LT |
148 | ssize_t length; |
149 | int new_value; | |
150 | ||
bfd51626 | 151 | if (count >= PAGE_SIZE) |
8365a719 | 152 | return -ENOMEM; |
b77a493b EP |
153 | |
154 | /* No partial writes. */ | |
b77a493b | 155 | if (*ppos != 0) |
8365a719 | 156 | return -EINVAL; |
b77a493b | 157 | |
8365a719 AV |
158 | page = memdup_user_nul(buf, count); |
159 | if (IS_ERR(page)) | |
160 | return PTR_ERR(page); | |
1da177e4 LT |
161 | |
162 | length = -EINVAL; | |
163 | if (sscanf(page, "%d", &new_value) != 1) | |
164 | goto out; | |
165 | ||
ea49d10e SS |
166 | new_value = !!new_value; |
167 | ||
1da177e4 LT |
168 | if (new_value != selinux_enforcing) { |
169 | length = task_has_security(current, SECURITY__SETENFORCE); | |
170 | if (length) | |
171 | goto out; | |
af601e46 | 172 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b EP |
173 | "enforcing=%d old_enforcing=%d auid=%u ses=%u", |
174 | new_value, selinux_enforcing, | |
581abc09 | 175 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 176 | audit_get_sessionid(current)); |
1da177e4 LT |
177 | selinux_enforcing = new_value; |
178 | if (selinux_enforcing) | |
179 | avc_ss_reset(0); | |
180 | selnl_notify_setenforce(selinux_enforcing); | |
11904167 | 181 | selinux_status_update_setenforce(selinux_enforcing); |
1da177e4 LT |
182 | } |
183 | length = count; | |
184 | out: | |
8365a719 | 185 | kfree(page); |
1da177e4 LT |
186 | return length; |
187 | } | |
188 | #else | |
189 | #define sel_write_enforce NULL | |
190 | #endif | |
191 | ||
9c2e08c5 | 192 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
193 | .read = sel_read_enforce, |
194 | .write = sel_write_enforce, | |
57a62c23 | 195 | .llseek = generic_file_llseek, |
1da177e4 LT |
196 | }; |
197 | ||
3f12070e EP |
198 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
199 | size_t count, loff_t *ppos) | |
200 | { | |
201 | char tmpbuf[TMPBUFLEN]; | |
202 | ssize_t length; | |
496ad9aa | 203 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e EP |
204 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
205 | security_get_reject_unknown() : !security_get_allow_unknown(); | |
206 | ||
207 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
208 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
209 | } | |
210 | ||
211 | static const struct file_operations sel_handle_unknown_ops = { | |
212 | .read = sel_read_handle_unknown, | |
57a62c23 | 213 | .llseek = generic_file_llseek, |
3f12070e EP |
214 | }; |
215 | ||
11904167 KK |
216 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
217 | { | |
218 | struct page *status = selinux_kernel_status_page(); | |
219 | ||
220 | if (!status) | |
221 | return -ENOMEM; | |
222 | ||
223 | filp->private_data = status; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
229 | size_t count, loff_t *ppos) | |
230 | { | |
231 | struct page *status = filp->private_data; | |
232 | ||
233 | BUG_ON(!status); | |
234 | ||
235 | return simple_read_from_buffer(buf, count, ppos, | |
236 | page_address(status), | |
237 | sizeof(struct selinux_kernel_status)); | |
238 | } | |
239 | ||
240 | static int sel_mmap_handle_status(struct file *filp, | |
241 | struct vm_area_struct *vma) | |
242 | { | |
243 | struct page *status = filp->private_data; | |
244 | unsigned long size = vma->vm_end - vma->vm_start; | |
245 | ||
246 | BUG_ON(!status); | |
247 | ||
248 | /* only allows one page from the head */ | |
249 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
250 | return -EIO; | |
251 | /* disallow writable mapping */ | |
252 | if (vma->vm_flags & VM_WRITE) | |
253 | return -EPERM; | |
254 | /* disallow mprotect() turns it into writable */ | |
255 | vma->vm_flags &= ~VM_MAYWRITE; | |
256 | ||
257 | return remap_pfn_range(vma, vma->vm_start, | |
258 | page_to_pfn(status), | |
259 | size, vma->vm_page_prot); | |
260 | } | |
261 | ||
262 | static const struct file_operations sel_handle_status_ops = { | |
263 | .open = sel_open_handle_status, | |
264 | .read = sel_read_handle_status, | |
265 | .mmap = sel_mmap_handle_status, | |
266 | .llseek = generic_file_llseek, | |
267 | }; | |
268 | ||
1da177e4 | 269 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 270 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
271 | size_t count, loff_t *ppos) |
272 | ||
273 | { | |
8365a719 | 274 | char *page; |
1da177e4 LT |
275 | ssize_t length; |
276 | int new_value; | |
1da177e4 | 277 | |
bfd51626 | 278 | if (count >= PAGE_SIZE) |
8365a719 | 279 | return -ENOMEM; |
b77a493b EP |
280 | |
281 | /* No partial writes. */ | |
b77a493b | 282 | if (*ppos != 0) |
8365a719 | 283 | return -EINVAL; |
b77a493b | 284 | |
8365a719 AV |
285 | page = memdup_user_nul(buf, count); |
286 | if (IS_ERR(page)) | |
287 | return PTR_ERR(page); | |
1da177e4 LT |
288 | |
289 | length = -EINVAL; | |
290 | if (sscanf(page, "%d", &new_value) != 1) | |
291 | goto out; | |
292 | ||
293 | if (new_value) { | |
294 | length = selinux_disable(); | |
b77a493b | 295 | if (length) |
1da177e4 | 296 | goto out; |
af601e46 | 297 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS, |
4746ec5b | 298 | "selinux=0 auid=%u ses=%u", |
581abc09 | 299 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 300 | audit_get_sessionid(current)); |
1da177e4 LT |
301 | } |
302 | ||
303 | length = count; | |
304 | out: | |
8365a719 | 305 | kfree(page); |
1da177e4 LT |
306 | return length; |
307 | } | |
308 | #else | |
309 | #define sel_write_disable NULL | |
310 | #endif | |
311 | ||
9c2e08c5 | 312 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 313 | .write = sel_write_disable, |
57a62c23 | 314 | .llseek = generic_file_llseek, |
1da177e4 LT |
315 | }; |
316 | ||
317 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 318 | size_t count, loff_t *ppos) |
1da177e4 LT |
319 | { |
320 | char tmpbuf[TMPBUFLEN]; | |
321 | ssize_t length; | |
322 | ||
323 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
324 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
325 | } | |
326 | ||
9c2e08c5 | 327 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 328 | .read = sel_read_policyvers, |
57a62c23 | 329 | .llseek = generic_file_llseek, |
1da177e4 LT |
330 | }; |
331 | ||
332 | /* declaration for sel_write_load */ | |
333 | static int sel_make_bools(void); | |
e47c8fc5 | 334 | static int sel_make_classes(void); |
3bb56b25 | 335 | static int sel_make_policycap(void); |
e47c8fc5 CP |
336 | |
337 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 338 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 339 | unsigned long *ino); |
1da177e4 LT |
340 | |
341 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
342 | size_t count, loff_t *ppos) | |
343 | { | |
344 | char tmpbuf[TMPBUFLEN]; | |
345 | ssize_t length; | |
346 | ||
0719aaf5 GT |
347 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
348 | security_mls_enabled()); | |
1da177e4 LT |
349 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
350 | } | |
351 | ||
9c2e08c5 | 352 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 353 | .read = sel_read_mls, |
57a62c23 | 354 | .llseek = generic_file_llseek, |
1da177e4 LT |
355 | }; |
356 | ||
cee74f47 EP |
357 | struct policy_load_memory { |
358 | size_t len; | |
359 | void *data; | |
360 | }; | |
361 | ||
362 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
363 | { | |
364 | struct policy_load_memory *plm = NULL; | |
365 | int rc; | |
366 | ||
367 | BUG_ON(filp->private_data); | |
368 | ||
369 | mutex_lock(&sel_mutex); | |
370 | ||
371 | rc = task_has_security(current, SECURITY__READ_POLICY); | |
372 | if (rc) | |
373 | goto err; | |
374 | ||
375 | rc = -EBUSY; | |
376 | if (policy_opened) | |
377 | goto err; | |
378 | ||
379 | rc = -ENOMEM; | |
380 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
381 | if (!plm) | |
382 | goto err; | |
383 | ||
384 | if (i_size_read(inode) != security_policydb_len()) { | |
5955102c | 385 | inode_lock(inode); |
cee74f47 | 386 | i_size_write(inode, security_policydb_len()); |
5955102c | 387 | inode_unlock(inode); |
cee74f47 EP |
388 | } |
389 | ||
390 | rc = security_read_policy(&plm->data, &plm->len); | |
391 | if (rc) | |
392 | goto err; | |
393 | ||
394 | policy_opened = 1; | |
395 | ||
396 | filp->private_data = plm; | |
397 | ||
398 | mutex_unlock(&sel_mutex); | |
399 | ||
400 | return 0; | |
401 | err: | |
402 | mutex_unlock(&sel_mutex); | |
403 | ||
404 | if (plm) | |
405 | vfree(plm->data); | |
406 | kfree(plm); | |
407 | return rc; | |
408 | } | |
409 | ||
410 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
411 | { | |
412 | struct policy_load_memory *plm = filp->private_data; | |
413 | ||
414 | BUG_ON(!plm); | |
415 | ||
416 | policy_opened = 0; | |
417 | ||
418 | vfree(plm->data); | |
419 | kfree(plm); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
425 | size_t count, loff_t *ppos) | |
426 | { | |
427 | struct policy_load_memory *plm = filp->private_data; | |
428 | int ret; | |
429 | ||
430 | mutex_lock(&sel_mutex); | |
431 | ||
432 | ret = task_has_security(current, SECURITY__READ_POLICY); | |
433 | if (ret) | |
434 | goto out; | |
435 | ||
436 | ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); | |
437 | out: | |
438 | mutex_unlock(&sel_mutex); | |
439 | return ret; | |
440 | } | |
441 | ||
845ca30f EP |
442 | static int sel_mmap_policy_fault(struct vm_area_struct *vma, |
443 | struct vm_fault *vmf) | |
444 | { | |
445 | struct policy_load_memory *plm = vma->vm_file->private_data; | |
446 | unsigned long offset; | |
447 | struct page *page; | |
448 | ||
449 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
450 | return VM_FAULT_SIGBUS; | |
451 | ||
452 | offset = vmf->pgoff << PAGE_SHIFT; | |
453 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
454 | return VM_FAULT_SIGBUS; | |
455 | ||
456 | page = vmalloc_to_page(plm->data + offset); | |
457 | get_page(page); | |
458 | ||
459 | vmf->page = page; | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
7cbea8dc | 464 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
465 | .fault = sel_mmap_policy_fault, |
466 | .page_mkwrite = sel_mmap_policy_fault, | |
467 | }; | |
468 | ||
ad3fa08c | 469 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
470 | { |
471 | if (vma->vm_flags & VM_SHARED) { | |
472 | /* do not allow mprotect to make mapping writable */ | |
473 | vma->vm_flags &= ~VM_MAYWRITE; | |
474 | ||
475 | if (vma->vm_flags & VM_WRITE) | |
476 | return -EACCES; | |
477 | } | |
478 | ||
314e51b9 | 479 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
480 | vma->vm_ops = &sel_mmap_policy_ops; |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
cee74f47 EP |
485 | static const struct file_operations sel_policy_ops = { |
486 | .open = sel_open_policy, | |
487 | .read = sel_read_policy, | |
845ca30f | 488 | .mmap = sel_mmap_policy, |
cee74f47 | 489 | .release = sel_release_policy, |
47a93a5b | 490 | .llseek = generic_file_llseek, |
cee74f47 EP |
491 | }; |
492 | ||
1872981b | 493 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
494 | size_t count, loff_t *ppos) |
495 | ||
496 | { | |
1da177e4 LT |
497 | ssize_t length; |
498 | void *data = NULL; | |
499 | ||
bb003079 | 500 | mutex_lock(&sel_mutex); |
1da177e4 LT |
501 | |
502 | length = task_has_security(current, SECURITY__LOAD_POLICY); | |
503 | if (length) | |
504 | goto out; | |
505 | ||
b77a493b EP |
506 | /* No partial writes. */ |
507 | length = -EINVAL; | |
508 | if (*ppos != 0) | |
1da177e4 | 509 | goto out; |
1da177e4 | 510 | |
b77a493b EP |
511 | length = -EFBIG; |
512 | if (count > 64 * 1024 * 1024) | |
513 | goto out; | |
514 | ||
515 | length = -ENOMEM; | |
516 | data = vmalloc(count); | |
517 | if (!data) | |
1da177e4 | 518 | goto out; |
1da177e4 LT |
519 | |
520 | length = -EFAULT; | |
521 | if (copy_from_user(data, buf, count) != 0) | |
522 | goto out; | |
523 | ||
524 | length = security_load_policy(data, count); | |
525 | if (length) | |
526 | goto out; | |
527 | ||
b77a493b EP |
528 | length = sel_make_bools(); |
529 | if (length) | |
e47c8fc5 | 530 | goto out1; |
e47c8fc5 | 531 | |
b77a493b EP |
532 | length = sel_make_classes(); |
533 | if (length) | |
3bb56b25 | 534 | goto out1; |
3bb56b25 | 535 | |
b77a493b EP |
536 | length = sel_make_policycap(); |
537 | if (length) | |
538 | goto out1; | |
539 | ||
540 | length = count; | |
e47c8fc5 CP |
541 | |
542 | out1: | |
af601e46 | 543 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
4746ec5b | 544 | "policy loaded auid=%u ses=%u", |
581abc09 | 545 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 546 | audit_get_sessionid(current)); |
1da177e4 | 547 | out: |
bb003079 | 548 | mutex_unlock(&sel_mutex); |
1da177e4 LT |
549 | vfree(data); |
550 | return length; | |
551 | } | |
552 | ||
9c2e08c5 | 553 | static const struct file_operations sel_load_ops = { |
1da177e4 | 554 | .write = sel_write_load, |
57a62c23 | 555 | .llseek = generic_file_llseek, |
1da177e4 LT |
556 | }; |
557 | ||
1872981b | 558 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 559 | { |
b77a493b | 560 | char *canon = NULL; |
ce9982d0 | 561 | u32 sid, len; |
1da177e4 LT |
562 | ssize_t length; |
563 | ||
564 | length = task_has_security(current, SECURITY__CHECK_CONTEXT); | |
565 | if (length) | |
b77a493b | 566 | goto out; |
1da177e4 | 567 | |
52a4c640 | 568 | length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
569 | if (length) |
570 | goto out; | |
1da177e4 | 571 | |
ce9982d0 | 572 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
573 | if (length) |
574 | goto out; | |
ce9982d0 | 575 | |
b77a493b | 576 | length = -ERANGE; |
ce9982d0 | 577 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
578 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
579 | "payload max\n", __func__, len); | |
1da177e4 | 580 | goto out; |
ce9982d0 | 581 | } |
1da177e4 | 582 | |
ce9982d0 SS |
583 | memcpy(buf, canon, len); |
584 | length = len; | |
1da177e4 | 585 | out: |
ce9982d0 | 586 | kfree(canon); |
1da177e4 LT |
587 | return length; |
588 | } | |
589 | ||
1da177e4 LT |
590 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
591 | size_t count, loff_t *ppos) | |
592 | { | |
593 | char tmpbuf[TMPBUFLEN]; | |
594 | ssize_t length; | |
595 | ||
596 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot); | |
597 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
598 | } | |
599 | ||
1872981b | 600 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
601 | size_t count, loff_t *ppos) |
602 | { | |
8365a719 | 603 | char *page; |
1da177e4 LT |
604 | ssize_t length; |
605 | unsigned int new_value; | |
606 | ||
607 | length = task_has_security(current, SECURITY__SETCHECKREQPROT); | |
608 | if (length) | |
8365a719 | 609 | return length; |
1da177e4 | 610 | |
bfd51626 | 611 | if (count >= PAGE_SIZE) |
8365a719 | 612 | return -ENOMEM; |
b77a493b EP |
613 | |
614 | /* No partial writes. */ | |
b77a493b | 615 | if (*ppos != 0) |
8365a719 | 616 | return -EINVAL; |
b77a493b | 617 | |
8365a719 AV |
618 | page = memdup_user_nul(buf, count); |
619 | if (IS_ERR(page)) | |
620 | return PTR_ERR(page); | |
1da177e4 LT |
621 | |
622 | length = -EINVAL; | |
623 | if (sscanf(page, "%u", &new_value) != 1) | |
624 | goto out; | |
625 | ||
626 | selinux_checkreqprot = new_value ? 1 : 0; | |
627 | length = count; | |
628 | out: | |
8365a719 | 629 | kfree(page); |
1da177e4 LT |
630 | return length; |
631 | } | |
9c2e08c5 | 632 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
633 | .read = sel_read_checkreqprot, |
634 | .write = sel_write_checkreqprot, | |
57a62c23 | 635 | .llseek = generic_file_llseek, |
1da177e4 LT |
636 | }; |
637 | ||
f9df6458 AP |
638 | static ssize_t sel_write_validatetrans(struct file *file, |
639 | const char __user *buf, | |
640 | size_t count, loff_t *ppos) | |
641 | { | |
642 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; | |
643 | char *req = NULL; | |
644 | u32 osid, nsid, tsid; | |
645 | u16 tclass; | |
646 | int rc; | |
647 | ||
648 | rc = task_has_security(current, SECURITY__VALIDATE_TRANS); | |
649 | if (rc) | |
650 | goto out; | |
651 | ||
652 | rc = -ENOMEM; | |
653 | if (count >= PAGE_SIZE) | |
654 | goto out; | |
655 | ||
656 | /* No partial writes. */ | |
657 | rc = -EINVAL; | |
658 | if (*ppos != 0) | |
659 | goto out; | |
660 | ||
661 | rc = -ENOMEM; | |
662 | req = kzalloc(count + 1, GFP_KERNEL); | |
663 | if (!req) | |
664 | goto out; | |
665 | ||
666 | rc = -EFAULT; | |
667 | if (copy_from_user(req, buf, count)) | |
668 | goto out; | |
669 | ||
670 | rc = -ENOMEM; | |
671 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
672 | if (!oldcon) | |
673 | goto out; | |
674 | ||
675 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
676 | if (!newcon) | |
677 | goto out; | |
678 | ||
679 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
680 | if (!taskcon) | |
681 | goto out; | |
682 | ||
683 | rc = -EINVAL; | |
684 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
685 | goto out; | |
686 | ||
687 | rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); | |
688 | if (rc) | |
689 | goto out; | |
690 | ||
691 | rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); | |
692 | if (rc) | |
693 | goto out; | |
694 | ||
695 | rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); | |
696 | if (rc) | |
697 | goto out; | |
698 | ||
699 | rc = security_validate_transition_user(osid, nsid, tsid, tclass); | |
700 | if (!rc) | |
701 | rc = count; | |
702 | out: | |
703 | kfree(req); | |
704 | kfree(oldcon); | |
705 | kfree(newcon); | |
706 | kfree(taskcon); | |
707 | return rc; | |
708 | } | |
709 | ||
710 | static const struct file_operations sel_transition_ops = { | |
711 | .write = sel_write_validatetrans, | |
712 | .llseek = generic_file_llseek, | |
713 | }; | |
714 | ||
1da177e4 LT |
715 | /* |
716 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
717 | */ | |
1872981b EP |
718 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
719 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
720 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
721 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
722 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 LT |
723 | |
724 | static ssize_t (*write_op[])(struct file *, char *, size_t) = { | |
725 | [SEL_ACCESS] = sel_write_access, | |
726 | [SEL_CREATE] = sel_write_create, | |
727 | [SEL_RELABEL] = sel_write_relabel, | |
728 | [SEL_USER] = sel_write_user, | |
729 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 730 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
731 | }; |
732 | ||
733 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
734 | { | |
496ad9aa | 735 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
736 | char *data; |
737 | ssize_t rv; | |
738 | ||
6e20a64a | 739 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
740 | return -EINVAL; |
741 | ||
742 | data = simple_transaction_get(file, buf, size); | |
743 | if (IS_ERR(data)) | |
744 | return PTR_ERR(data); | |
745 | ||
1872981b EP |
746 | rv = write_op[ino](file, data, size); |
747 | if (rv > 0) { | |
1da177e4 LT |
748 | simple_transaction_set(file, rv); |
749 | rv = size; | |
750 | } | |
751 | return rv; | |
752 | } | |
753 | ||
9c2e08c5 | 754 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
755 | .write = selinux_transaction_write, |
756 | .read = simple_transaction_read, | |
757 | .release = simple_transaction_release, | |
57a62c23 | 758 | .llseek = generic_file_llseek, |
1da177e4 LT |
759 | }; |
760 | ||
761 | /* | |
762 | * payload - write methods | |
763 | * If the method has a response, the response should be put in buf, | |
764 | * and the length returned. Otherwise return 0 or and -error. | |
765 | */ | |
766 | ||
1872981b | 767 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 768 | { |
b77a493b | 769 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
770 | u32 ssid, tsid; |
771 | u16 tclass; | |
1da177e4 LT |
772 | struct av_decision avd; |
773 | ssize_t length; | |
774 | ||
775 | length = task_has_security(current, SECURITY__COMPUTE_AV); | |
776 | if (length) | |
b77a493b | 777 | goto out; |
1da177e4 LT |
778 | |
779 | length = -ENOMEM; | |
c1a7368a | 780 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 781 | if (!scon) |
b77a493b | 782 | goto out; |
1da177e4 | 783 | |
b77a493b | 784 | length = -ENOMEM; |
c1a7368a | 785 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
786 | if (!tcon) |
787 | goto out; | |
1da177e4 LT |
788 | |
789 | length = -EINVAL; | |
19439d05 | 790 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 791 | goto out; |
1da177e4 | 792 | |
44be2f65 | 793 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
794 | if (length) |
795 | goto out; | |
796 | ||
44be2f65 | 797 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
798 | if (length) |
799 | goto out; | |
1da177e4 | 800 | |
19439d05 | 801 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
802 | |
803 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 804 | "%x %x %x %x %u %x", |
f1c6381a | 805 | avd.allowed, 0xffffffff, |
1da177e4 | 806 | avd.auditallow, avd.auditdeny, |
8a6f83af | 807 | avd.seqno, avd.flags); |
1da177e4 | 808 | out: |
b77a493b | 809 | kfree(tcon); |
1da177e4 LT |
810 | kfree(scon); |
811 | return length; | |
812 | } | |
813 | ||
1872981b | 814 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 815 | { |
b77a493b | 816 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 817 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
818 | u32 ssid, tsid, newsid; |
819 | u16 tclass; | |
820 | ssize_t length; | |
b77a493b | 821 | char *newcon = NULL; |
1da177e4 | 822 | u32 len; |
f50a3ec9 | 823 | int nargs; |
1da177e4 LT |
824 | |
825 | length = task_has_security(current, SECURITY__COMPUTE_CREATE); | |
826 | if (length) | |
b77a493b | 827 | goto out; |
1da177e4 LT |
828 | |
829 | length = -ENOMEM; | |
c1a7368a | 830 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 831 | if (!scon) |
b77a493b | 832 | goto out; |
1da177e4 | 833 | |
b77a493b | 834 | length = -ENOMEM; |
c1a7368a | 835 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
836 | if (!tcon) |
837 | goto out; | |
1da177e4 | 838 | |
f50a3ec9 KK |
839 | length = -ENOMEM; |
840 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
841 | if (!namebuf) | |
842 | goto out; | |
843 | ||
1da177e4 | 844 | length = -EINVAL; |
f50a3ec9 KK |
845 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
846 | if (nargs < 3 || nargs > 4) | |
b77a493b | 847 | goto out; |
0f7e4c33 KK |
848 | if (nargs == 4) { |
849 | /* | |
850 | * If and when the name of new object to be queried contains | |
851 | * either whitespace or multibyte characters, they shall be | |
852 | * encoded based on the percentage-encoding rule. | |
853 | * If not encoded, the sscanf logic picks up only left-half | |
854 | * of the supplied name; splitted by a whitespace unexpectedly. | |
855 | */ | |
856 | char *r, *w; | |
857 | int c1, c2; | |
858 | ||
859 | r = w = namebuf; | |
860 | do { | |
861 | c1 = *r++; | |
862 | if (c1 == '+') | |
863 | c1 = ' '; | |
864 | else if (c1 == '%') { | |
af7ff2c2 AS |
865 | c1 = hex_to_bin(*r++); |
866 | if (c1 < 0) | |
0f7e4c33 | 867 | goto out; |
af7ff2c2 AS |
868 | c2 = hex_to_bin(*r++); |
869 | if (c2 < 0) | |
0f7e4c33 KK |
870 | goto out; |
871 | c1 = (c1 << 4) | c2; | |
872 | } | |
873 | *w++ = c1; | |
874 | } while (c1 != '\0'); | |
875 | ||
f50a3ec9 | 876 | objname = namebuf; |
0f7e4c33 | 877 | } |
1da177e4 | 878 | |
44be2f65 | 879 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
880 | if (length) |
881 | goto out; | |
882 | ||
44be2f65 | 883 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
884 | if (length) |
885 | goto out; | |
1da177e4 | 886 | |
f50a3ec9 KK |
887 | length = security_transition_sid_user(ssid, tsid, tclass, |
888 | objname, &newsid); | |
b77a493b EP |
889 | if (length) |
890 | goto out; | |
1da177e4 LT |
891 | |
892 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
893 | if (length) |
894 | goto out; | |
1da177e4 | 895 | |
b77a493b | 896 | length = -ERANGE; |
1da177e4 | 897 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
744ba35e EP |
898 | printk(KERN_ERR "SELinux: %s: context size (%u) exceeds " |
899 | "payload max\n", __func__, len); | |
b77a493b | 900 | goto out; |
1da177e4 LT |
901 | } |
902 | ||
903 | memcpy(buf, newcon, len); | |
904 | length = len; | |
b77a493b | 905 | out: |
1da177e4 | 906 | kfree(newcon); |
f50a3ec9 | 907 | kfree(namebuf); |
1da177e4 | 908 | kfree(tcon); |
1da177e4 LT |
909 | kfree(scon); |
910 | return length; | |
911 | } | |
912 | ||
1872981b | 913 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 914 | { |
b77a493b | 915 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
916 | u32 ssid, tsid, newsid; |
917 | u16 tclass; | |
918 | ssize_t length; | |
b77a493b | 919 | char *newcon = NULL; |
1da177e4 LT |
920 | u32 len; |
921 | ||
922 | length = task_has_security(current, SECURITY__COMPUTE_RELABEL); | |
923 | if (length) | |
b77a493b | 924 | goto out; |
1da177e4 LT |
925 | |
926 | length = -ENOMEM; | |
c1a7368a | 927 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 928 | if (!scon) |
b77a493b | 929 | goto out; |
1da177e4 | 930 | |
b77a493b | 931 | length = -ENOMEM; |
c1a7368a | 932 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
933 | if (!tcon) |
934 | goto out; | |
1da177e4 LT |
935 | |
936 | length = -EINVAL; | |
937 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 938 | goto out; |
1da177e4 | 939 | |
44be2f65 | 940 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
941 | if (length) |
942 | goto out; | |
943 | ||
44be2f65 | 944 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
945 | if (length) |
946 | goto out; | |
1da177e4 LT |
947 | |
948 | length = security_change_sid(ssid, tsid, tclass, &newsid); | |
b77a493b EP |
949 | if (length) |
950 | goto out; | |
1da177e4 LT |
951 | |
952 | length = security_sid_to_context(newsid, &newcon, &len); | |
b77a493b EP |
953 | if (length) |
954 | goto out; | |
1da177e4 | 955 | |
b77a493b EP |
956 | length = -ERANGE; |
957 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
958 | goto out; | |
1da177e4 LT |
959 | |
960 | memcpy(buf, newcon, len); | |
961 | length = len; | |
b77a493b | 962 | out: |
1da177e4 | 963 | kfree(newcon); |
1da177e4 | 964 | kfree(tcon); |
1da177e4 LT |
965 | kfree(scon); |
966 | return length; | |
967 | } | |
968 | ||
1872981b | 969 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 970 | { |
b77a493b EP |
971 | char *con = NULL, *user = NULL, *ptr; |
972 | u32 sid, *sids = NULL; | |
1da177e4 LT |
973 | ssize_t length; |
974 | char *newcon; | |
975 | int i, rc; | |
976 | u32 len, nsids; | |
977 | ||
978 | length = task_has_security(current, SECURITY__COMPUTE_USER); | |
979 | if (length) | |
6eab04a8 | 980 | goto out; |
1da177e4 LT |
981 | |
982 | length = -ENOMEM; | |
c1a7368a | 983 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 984 | if (!con) |
6eab04a8 | 985 | goto out; |
1da177e4 | 986 | |
b77a493b | 987 | length = -ENOMEM; |
c1a7368a | 988 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
989 | if (!user) |
990 | goto out; | |
1da177e4 LT |
991 | |
992 | length = -EINVAL; | |
993 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 994 | goto out; |
1da177e4 | 995 | |
44be2f65 | 996 | length = security_context_str_to_sid(con, &sid, GFP_KERNEL); |
b77a493b EP |
997 | if (length) |
998 | goto out; | |
1da177e4 LT |
999 | |
1000 | length = security_get_user_sids(sid, user, &sids, &nsids); | |
b77a493b EP |
1001 | if (length) |
1002 | goto out; | |
1da177e4 LT |
1003 | |
1004 | length = sprintf(buf, "%u", nsids) + 1; | |
1005 | ptr = buf + length; | |
1006 | for (i = 0; i < nsids; i++) { | |
1007 | rc = security_sid_to_context(sids[i], &newcon, &len); | |
1008 | if (rc) { | |
1009 | length = rc; | |
b77a493b | 1010 | goto out; |
1da177e4 LT |
1011 | } |
1012 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1013 | kfree(newcon); | |
1014 | length = -ERANGE; | |
b77a493b | 1015 | goto out; |
1da177e4 LT |
1016 | } |
1017 | memcpy(ptr, newcon, len); | |
1018 | kfree(newcon); | |
1019 | ptr += len; | |
1020 | length += len; | |
1021 | } | |
b77a493b | 1022 | out: |
1da177e4 | 1023 | kfree(sids); |
1da177e4 | 1024 | kfree(user); |
1da177e4 LT |
1025 | kfree(con); |
1026 | return length; | |
1027 | } | |
1028 | ||
1872981b | 1029 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1030 | { |
b77a493b | 1031 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1032 | u32 ssid, tsid, newsid; |
1033 | u16 tclass; | |
1034 | ssize_t length; | |
b77a493b | 1035 | char *newcon = NULL; |
1da177e4 LT |
1036 | u32 len; |
1037 | ||
1038 | length = task_has_security(current, SECURITY__COMPUTE_MEMBER); | |
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 LT |
1144 | |
1145 | length = task_has_security(current, SECURITY__SETBOOL); | |
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 LT |
1200 | |
1201 | length = task_has_security(current, SECURITY__SETBOOL); | |
1202 | if (length) | |
1203 | goto out; | |
1204 | ||
b77a493b EP |
1205 | length = -ENOMEM; |
1206 | if (count >= PAGE_SIZE) | |
1da177e4 | 1207 | goto out; |
b77a493b EP |
1208 | |
1209 | /* No partial writes. */ | |
1210 | length = -EINVAL; | |
1211 | if (*ppos != 0) | |
1da177e4 | 1212 | goto out; |
b77a493b | 1213 | |
8365a719 AV |
1214 | page = memdup_user_nul(buf, count); |
1215 | if (IS_ERR(page)) { | |
1216 | length = PTR_ERR(page); | |
1217 | page = NULL; | |
1da177e4 | 1218 | goto out; |
8365a719 | 1219 | } |
1da177e4 LT |
1220 | |
1221 | length = -EINVAL; | |
1222 | if (sscanf(page, "%d", &new_value) != 1) | |
1223 | goto out; | |
1224 | ||
b77a493b | 1225 | length = 0; |
1872981b | 1226 | if (new_value && bool_pending_values) |
b77a493b | 1227 | length = security_set_bools(bool_num, bool_pending_values); |
1da177e4 | 1228 | |
b77a493b EP |
1229 | if (!length) |
1230 | length = count; | |
1da177e4 LT |
1231 | |
1232 | out: | |
bb003079 | 1233 | mutex_unlock(&sel_mutex); |
8365a719 | 1234 | kfree(page); |
1da177e4 LT |
1235 | return length; |
1236 | } | |
1237 | ||
9c2e08c5 | 1238 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1239 | .write = sel_commit_bools_write, |
57a62c23 | 1240 | .llseek = generic_file_llseek, |
1da177e4 LT |
1241 | }; |
1242 | ||
0c92d7c7 | 1243 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1244 | { |
ad52184b AV |
1245 | d_genocide(de); |
1246 | shrink_dcache_parent(de); | |
1da177e4 LT |
1247 | } |
1248 | ||
1249 | #define BOOL_DIR_NAME "booleans" | |
1250 | ||
1251 | static int sel_make_bools(void) | |
1252 | { | |
b77a493b | 1253 | int i, ret; |
1da177e4 LT |
1254 | ssize_t len; |
1255 | struct dentry *dentry = NULL; | |
1256 | struct dentry *dir = bool_dir; | |
1257 | struct inode *inode = NULL; | |
1258 | struct inode_security_struct *isec; | |
1259 | char **names = NULL, *page; | |
1260 | int num; | |
1261 | int *values = NULL; | |
1262 | u32 sid; | |
1263 | ||
1264 | /* remove any existing files */ | |
8007f102 XF |
1265 | for (i = 0; i < bool_num; i++) |
1266 | kfree(bool_pending_names[i]); | |
d313f948 | 1267 | kfree(bool_pending_names); |
9a5f04bf | 1268 | kfree(bool_pending_values); |
154c50ca | 1269 | bool_num = 0; |
d313f948 | 1270 | bool_pending_names = NULL; |
20c19e41 | 1271 | bool_pending_values = NULL; |
1da177e4 | 1272 | |
0c92d7c7 | 1273 | sel_remove_entries(dir); |
1da177e4 | 1274 | |
b77a493b | 1275 | ret = -ENOMEM; |
1872981b EP |
1276 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1277 | if (!page) | |
b77a493b | 1278 | goto out; |
1da177e4 LT |
1279 | |
1280 | ret = security_get_bools(&num, &names, &values); | |
b77a493b | 1281 | if (ret) |
1da177e4 LT |
1282 | goto out; |
1283 | ||
1284 | for (i = 0; i < num; i++) { | |
b77a493b | 1285 | ret = -ENOMEM; |
1da177e4 | 1286 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1287 | if (!dentry) |
1288 | goto out; | |
1289 | ||
1290 | ret = -ENOMEM; | |
1da177e4 | 1291 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
b77a493b EP |
1292 | if (!inode) |
1293 | goto out; | |
1da177e4 | 1294 | |
b77a493b | 1295 | ret = -ENAMETOOLONG; |
cc1dad71 | 1296 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
b77a493b EP |
1297 | if (len >= PAGE_SIZE) |
1298 | goto out; | |
1299 | ||
1872981b EP |
1300 | isec = (struct inode_security_struct *)inode->i_security; |
1301 | ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid); | |
1302 | if (ret) | |
b77a493b EP |
1303 | goto out; |
1304 | ||
1da177e4 | 1305 | isec->sid = sid; |
42059112 | 1306 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1307 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1308 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1309 | d_add(dentry, inode); |
1310 | } | |
1311 | bool_num = num; | |
d313f948 | 1312 | bool_pending_names = names; |
1da177e4 | 1313 | bool_pending_values = values; |
b77a493b EP |
1314 | |
1315 | free_page((unsigned long)page); | |
1316 | return 0; | |
1da177e4 LT |
1317 | out: |
1318 | free_page((unsigned long)page); | |
b77a493b | 1319 | |
1da177e4 | 1320 | if (names) { |
9a5f04bf JJ |
1321 | for (i = 0; i < num; i++) |
1322 | kfree(names[i]); | |
1da177e4 LT |
1323 | kfree(names); |
1324 | } | |
20c19e41 | 1325 | kfree(values); |
0c92d7c7 | 1326 | sel_remove_entries(dir); |
b77a493b EP |
1327 | |
1328 | return ret; | |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | #define NULL_FILE_NAME "null" | |
1332 | ||
765927b2 | 1333 | struct path selinux_null; |
1da177e4 LT |
1334 | |
1335 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, | |
1336 | size_t count, loff_t *ppos) | |
1337 | { | |
1338 | char tmpbuf[TMPBUFLEN]; | |
1339 | ssize_t length; | |
1340 | ||
1341 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold); | |
1342 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1343 | } | |
1344 | ||
1872981b EP |
1345 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1346 | const char __user *buf, | |
1da177e4 LT |
1347 | size_t count, loff_t *ppos) |
1348 | ||
1349 | { | |
8365a719 | 1350 | char *page; |
1da177e4 | 1351 | ssize_t ret; |
309c5fad | 1352 | unsigned int new_value; |
1da177e4 | 1353 | |
b77a493b EP |
1354 | ret = task_has_security(current, SECURITY__SETSECPARAM); |
1355 | if (ret) | |
8365a719 | 1356 | return ret; |
1da177e4 | 1357 | |
b77a493b | 1358 | if (count >= PAGE_SIZE) |
8365a719 | 1359 | return -ENOMEM; |
1da177e4 | 1360 | |
b77a493b | 1361 | /* No partial writes. */ |
b77a493b | 1362 | if (*ppos != 0) |
8365a719 | 1363 | return -EINVAL; |
1da177e4 | 1364 | |
8365a719 AV |
1365 | page = memdup_user_nul(buf, count); |
1366 | if (IS_ERR(page)) | |
1367 | return PTR_ERR(page); | |
1da177e4 | 1368 | |
b77a493b EP |
1369 | ret = -EINVAL; |
1370 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1371 | goto out; |
1da177e4 | 1372 | |
b77a493b EP |
1373 | avc_cache_threshold = new_value; |
1374 | ||
1da177e4 | 1375 | ret = count; |
1da177e4 | 1376 | out: |
8365a719 | 1377 | kfree(page); |
1da177e4 LT |
1378 | return ret; |
1379 | } | |
1380 | ||
1381 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1382 | size_t count, loff_t *ppos) | |
1383 | { | |
1384 | char *page; | |
b77a493b | 1385 | ssize_t length; |
1da177e4 LT |
1386 | |
1387 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1388 | if (!page) |
1389 | return -ENOMEM; | |
1390 | ||
1391 | length = avc_get_hash_stats(page); | |
1392 | if (length >= 0) | |
1393 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1394 | free_page((unsigned long)page); |
b77a493b EP |
1395 | |
1396 | return length; | |
1da177e4 LT |
1397 | } |
1398 | ||
9c2e08c5 | 1399 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1400 | .read = sel_read_avc_cache_threshold, |
1401 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1402 | .llseek = generic_file_llseek, |
1da177e4 LT |
1403 | }; |
1404 | ||
9c2e08c5 | 1405 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1406 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1407 | .llseek = generic_file_llseek, |
1da177e4 LT |
1408 | }; |
1409 | ||
1410 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1411 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1412 | { | |
1413 | int cpu; | |
1414 | ||
4f4b6c1a | 1415 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1416 | if (!cpu_possible(cpu)) |
1417 | continue; | |
1418 | *idx = cpu + 1; | |
1419 | return &per_cpu(avc_cache_stats, cpu); | |
1420 | } | |
1421 | return NULL; | |
1422 | } | |
1423 | ||
1424 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1425 | { | |
1426 | loff_t n = *pos - 1; | |
1427 | ||
1428 | if (*pos == 0) | |
1429 | return SEQ_START_TOKEN; | |
1430 | ||
1431 | return sel_avc_get_stat_idx(&n); | |
1432 | } | |
1433 | ||
1434 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1435 | { | |
1436 | return sel_avc_get_stat_idx(pos); | |
1437 | } | |
1438 | ||
1439 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1440 | { | |
1441 | struct avc_cache_stats *st = v; | |
1442 | ||
1443 | if (v == SEQ_START_TOKEN) | |
1444 | seq_printf(seq, "lookups hits misses allocations reclaims " | |
1445 | "frees\n"); | |
257313b2 LT |
1446 | else { |
1447 | unsigned int lookups = st->lookups; | |
1448 | unsigned int misses = st->misses; | |
1449 | unsigned int hits = lookups - misses; | |
1450 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1451 | hits, misses, st->allocations, | |
1da177e4 | 1452 | st->reclaims, st->frees); |
257313b2 | 1453 | } |
1da177e4 LT |
1454 | return 0; |
1455 | } | |
1456 | ||
1457 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1458 | { } | |
1459 | ||
1996a109 | 1460 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1461 | .start = sel_avc_stats_seq_start, |
1462 | .next = sel_avc_stats_seq_next, | |
1463 | .show = sel_avc_stats_seq_show, | |
1464 | .stop = sel_avc_stats_seq_stop, | |
1465 | }; | |
1466 | ||
1467 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1468 | { | |
1469 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1470 | } | |
1471 | ||
9c2e08c5 | 1472 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1473 | .open = sel_open_avc_cache_stats, |
1474 | .read = seq_read, | |
1475 | .llseek = seq_lseek, | |
1476 | .release = seq_release, | |
1477 | }; | |
1478 | #endif | |
1479 | ||
1480 | static int sel_make_avc_files(struct dentry *dir) | |
1481 | { | |
b77a493b | 1482 | int i; |
1da177e4 LT |
1483 | static struct tree_descr files[] = { |
1484 | { "cache_threshold", | |
1485 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1486 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1487 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1488 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1489 | #endif | |
1490 | }; | |
1491 | ||
6e20a64a | 1492 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1493 | struct inode *inode; |
1494 | struct dentry *dentry; | |
1495 | ||
1496 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1497 | if (!dentry) |
1498 | return -ENOMEM; | |
1da177e4 LT |
1499 | |
1500 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
b77a493b EP |
1501 | if (!inode) |
1502 | return -ENOMEM; | |
1503 | ||
1da177e4 | 1504 | inode->i_fop = files[i].ops; |
6174eafc | 1505 | inode->i_ino = ++sel_last_ino; |
1da177e4 LT |
1506 | d_add(dentry, inode); |
1507 | } | |
b77a493b EP |
1508 | |
1509 | return 0; | |
1da177e4 LT |
1510 | } |
1511 | ||
1872981b | 1512 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1513 | size_t count, loff_t *ppos) |
1514 | { | |
f0ee2e46 JC |
1515 | char *con; |
1516 | u32 sid, len; | |
1517 | ssize_t ret; | |
1518 | ||
496ad9aa | 1519 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
f0ee2e46 | 1520 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1521 | if (ret) |
f0ee2e46 JC |
1522 | return ret; |
1523 | ||
1524 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1525 | kfree(con); | |
1526 | return ret; | |
1527 | } | |
1528 | ||
1529 | static const struct file_operations sel_initcon_ops = { | |
1530 | .read = sel_read_initcon, | |
57a62c23 | 1531 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1532 | }; |
1533 | ||
1534 | static int sel_make_initcon_files(struct dentry *dir) | |
1535 | { | |
b77a493b | 1536 | int i; |
f0ee2e46 JC |
1537 | |
1538 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1539 | struct inode *inode; | |
1540 | struct dentry *dentry; | |
1541 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1542 | if (!dentry) |
1543 | return -ENOMEM; | |
f0ee2e46 JC |
1544 | |
1545 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1546 | if (!inode) |
1547 | return -ENOMEM; | |
1548 | ||
f0ee2e46 JC |
1549 | inode->i_fop = &sel_initcon_ops; |
1550 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1551 | d_add(dentry, inode); | |
1552 | } | |
b77a493b EP |
1553 | |
1554 | return 0; | |
f0ee2e46 JC |
1555 | } |
1556 | ||
e47c8fc5 CP |
1557 | static inline unsigned long sel_class_to_ino(u16 class) |
1558 | { | |
1559 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1560 | } | |
1561 | ||
1562 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1563 | { | |
92ae9e82 | 1564 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1565 | } |
1566 | ||
1567 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1568 | { | |
1569 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1570 | } | |
1571 | ||
1572 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1573 | { | |
1574 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1575 | } | |
1576 | ||
1872981b | 1577 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1578 | size_t count, loff_t *ppos) |
1579 | { | |
496ad9aa | 1580 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1581 | char res[TMPBUFLEN]; |
1582 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1583 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1584 | } |
1585 | ||
1586 | static const struct file_operations sel_class_ops = { | |
1587 | .read = sel_read_class, | |
57a62c23 | 1588 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1589 | }; |
1590 | ||
1872981b | 1591 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1592 | size_t count, loff_t *ppos) |
1593 | { | |
496ad9aa | 1594 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1595 | char res[TMPBUFLEN]; |
1596 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1597 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1598 | } |
1599 | ||
1600 | static const struct file_operations sel_perm_ops = { | |
1601 | .read = sel_read_perm, | |
57a62c23 | 1602 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1603 | }; |
1604 | ||
3bb56b25 PM |
1605 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1606 | size_t count, loff_t *ppos) | |
1607 | { | |
1608 | int value; | |
1609 | char tmpbuf[TMPBUFLEN]; | |
1610 | ssize_t length; | |
496ad9aa | 1611 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 PM |
1612 | |
1613 | value = security_policycap_supported(i_ino & SEL_INO_MASK); | |
1614 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); | |
1615 | ||
1616 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1617 | } | |
1618 | ||
1619 | static const struct file_operations sel_policycap_ops = { | |
1620 | .read = sel_read_policycap, | |
57a62c23 | 1621 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1622 | }; |
1623 | ||
e47c8fc5 CP |
1624 | static int sel_make_perm_files(char *objclass, int classvalue, |
1625 | struct dentry *dir) | |
1626 | { | |
b77a493b | 1627 | int i, rc, nperms; |
e47c8fc5 CP |
1628 | char **perms; |
1629 | ||
1630 | rc = security_get_permissions(objclass, &perms, &nperms); | |
1631 | if (rc) | |
b77a493b | 1632 | return rc; |
e47c8fc5 CP |
1633 | |
1634 | for (i = 0; i < nperms; i++) { | |
1635 | struct inode *inode; | |
1636 | struct dentry *dentry; | |
1637 | ||
b77a493b | 1638 | rc = -ENOMEM; |
e47c8fc5 | 1639 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1640 | if (!dentry) |
1641 | goto out; | |
e47c8fc5 | 1642 | |
b77a493b | 1643 | rc = -ENOMEM; |
e47c8fc5 | 1644 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
b77a493b EP |
1645 | if (!inode) |
1646 | goto out; | |
1647 | ||
e47c8fc5 CP |
1648 | inode->i_fop = &sel_perm_ops; |
1649 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1650 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1651 | d_add(dentry, inode); |
1652 | } | |
b77a493b EP |
1653 | rc = 0; |
1654 | out: | |
e47c8fc5 CP |
1655 | for (i = 0; i < nperms; i++) |
1656 | kfree(perms[i]); | |
1657 | kfree(perms); | |
e47c8fc5 CP |
1658 | return rc; |
1659 | } | |
1660 | ||
1661 | static int sel_make_class_dir_entries(char *classname, int index, | |
1662 | struct dentry *dir) | |
1663 | { | |
1664 | struct dentry *dentry = NULL; | |
1665 | struct inode *inode = NULL; | |
1666 | int rc; | |
1667 | ||
1668 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1669 | if (!dentry) |
1670 | return -ENOMEM; | |
e47c8fc5 CP |
1671 | |
1672 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
b77a493b EP |
1673 | if (!inode) |
1674 | return -ENOMEM; | |
e47c8fc5 CP |
1675 | |
1676 | inode->i_fop = &sel_class_ops; | |
1677 | inode->i_ino = sel_class_to_ino(index); | |
1678 | d_add(dentry, inode); | |
1679 | ||
a1c2aa1e AV |
1680 | dentry = sel_make_dir(dir, "perms", &last_class_ino); |
1681 | if (IS_ERR(dentry)) | |
1682 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1683 | |
1684 | rc = sel_make_perm_files(classname, index, dentry); | |
1685 | ||
e47c8fc5 CP |
1686 | return rc; |
1687 | } | |
1688 | ||
e47c8fc5 CP |
1689 | static int sel_make_classes(void) |
1690 | { | |
b77a493b | 1691 | int rc, nclasses, i; |
e47c8fc5 CP |
1692 | char **classes; |
1693 | ||
1694 | /* delete any existing entries */ | |
ad52184b | 1695 | sel_remove_entries(class_dir); |
e47c8fc5 CP |
1696 | |
1697 | rc = security_get_classes(&classes, &nclasses); | |
b77a493b EP |
1698 | if (rc) |
1699 | return rc; | |
e47c8fc5 CP |
1700 | |
1701 | /* +2 since classes are 1-indexed */ | |
c1a7368a | 1702 | last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1703 | |
1704 | for (i = 0; i < nclasses; i++) { | |
1705 | struct dentry *class_name_dir; | |
1706 | ||
a1c2aa1e | 1707 | class_name_dir = sel_make_dir(class_dir, classes[i], |
e47c8fc5 | 1708 | &last_class_ino); |
a1c2aa1e AV |
1709 | if (IS_ERR(class_name_dir)) { |
1710 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1711 | goto out; |
a1c2aa1e | 1712 | } |
e47c8fc5 CP |
1713 | |
1714 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1715 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1716 | class_name_dir); |
1717 | if (rc) | |
b77a493b | 1718 | goto out; |
e47c8fc5 | 1719 | } |
b77a493b EP |
1720 | rc = 0; |
1721 | out: | |
e47c8fc5 CP |
1722 | for (i = 0; i < nclasses; i++) |
1723 | kfree(classes[i]); | |
1724 | kfree(classes); | |
e47c8fc5 CP |
1725 | return rc; |
1726 | } | |
1727 | ||
3bb56b25 PM |
1728 | static int sel_make_policycap(void) |
1729 | { | |
1730 | unsigned int iter; | |
1731 | struct dentry *dentry = NULL; | |
1732 | struct inode *inode = NULL; | |
1733 | ||
1734 | sel_remove_entries(policycap_dir); | |
1735 | ||
1736 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
1737 | if (iter < ARRAY_SIZE(policycap_names)) | |
1738 | dentry = d_alloc_name(policycap_dir, | |
1739 | policycap_names[iter]); | |
1740 | else | |
1741 | dentry = d_alloc_name(policycap_dir, "unknown"); | |
1742 | ||
1743 | if (dentry == NULL) | |
1744 | return -ENOMEM; | |
1745 | ||
1746 | inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO); | |
1747 | if (inode == NULL) | |
1748 | return -ENOMEM; | |
1749 | ||
1750 | inode->i_fop = &sel_policycap_ops; | |
1751 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1752 | d_add(dentry, inode); | |
1753 | } | |
1754 | ||
1755 | return 0; | |
1756 | } | |
1757 | ||
a1c2aa1e | 1758 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1759 | unsigned long *ino) |
1da177e4 | 1760 | { |
a1c2aa1e | 1761 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1762 | struct inode *inode; |
1763 | ||
a1c2aa1e AV |
1764 | if (!dentry) |
1765 | return ERR_PTR(-ENOMEM); | |
1766 | ||
1767 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1768 | if (!inode) { | |
1769 | dput(dentry); | |
1770 | return ERR_PTR(-ENOMEM); | |
1771 | } | |
b77a493b | 1772 | |
1da177e4 LT |
1773 | inode->i_op = &simple_dir_inode_operations; |
1774 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1775 | inode->i_ino = ++(*ino); |
40e906f8 | 1776 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1777 | inc_nlink(inode); |
1da177e4 | 1778 | d_add(dentry, inode); |
edb20fb5 | 1779 | /* bump link count on parent directory, too */ |
ce0b16dd | 1780 | inc_nlink(d_inode(dir)); |
b77a493b | 1781 | |
a1c2aa1e | 1782 | return dentry; |
1da177e4 LT |
1783 | } |
1784 | ||
1872981b | 1785 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 LT |
1786 | { |
1787 | int ret; | |
1788 | struct dentry *dentry; | |
a1c2aa1e | 1789 | struct inode *inode; |
1da177e4 LT |
1790 | struct inode_security_struct *isec; |
1791 | ||
1792 | static struct tree_descr selinux_files[] = { | |
1793 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, | |
1794 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1795 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1796 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1797 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1798 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1799 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1800 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1801 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1802 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1803 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1804 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1805 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1806 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1807 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1808 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1809 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1810 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1811 | S_IWUGO}, | |
1da177e4 LT |
1812 | /* last one */ {""} |
1813 | }; | |
1814 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); | |
1815 | if (ret) | |
161ce45a | 1816 | goto err; |
1da177e4 | 1817 | |
a1c2aa1e AV |
1818 | bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino); |
1819 | if (IS_ERR(bool_dir)) { | |
1820 | ret = PTR_ERR(bool_dir); | |
1821 | bool_dir = NULL; | |
161ce45a | 1822 | goto err; |
a1c2aa1e | 1823 | } |
1da177e4 | 1824 | |
b77a493b | 1825 | ret = -ENOMEM; |
1da177e4 | 1826 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1827 | if (!dentry) |
161ce45a | 1828 | goto err; |
1da177e4 | 1829 | |
b77a493b | 1830 | ret = -ENOMEM; |
1da177e4 | 1831 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
b77a493b | 1832 | if (!inode) |
161ce45a | 1833 | goto err; |
b77a493b | 1834 | |
6174eafc | 1835 | inode->i_ino = ++sel_last_ino; |
1872981b | 1836 | isec = (struct inode_security_struct *)inode->i_security; |
1da177e4 LT |
1837 | isec->sid = SECINITSID_DEVNULL; |
1838 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1839 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1840 | |
1841 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1842 | d_add(dentry, inode); | |
765927b2 | 1843 | selinux_null.dentry = dentry; |
1da177e4 | 1844 | |
a1c2aa1e AV |
1845 | dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino); |
1846 | if (IS_ERR(dentry)) { | |
1847 | ret = PTR_ERR(dentry); | |
161ce45a | 1848 | goto err; |
a1c2aa1e | 1849 | } |
1da177e4 LT |
1850 | |
1851 | ret = sel_make_avc_files(dentry); | |
1852 | if (ret) | |
161ce45a | 1853 | goto err; |
f0ee2e46 | 1854 | |
a1c2aa1e AV |
1855 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino); |
1856 | if (IS_ERR(dentry)) { | |
1857 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1858 | goto err; |
a1c2aa1e | 1859 | } |
f0ee2e46 JC |
1860 | |
1861 | ret = sel_make_initcon_files(dentry); | |
1862 | if (ret) | |
1863 | goto err; | |
1864 | ||
a1c2aa1e AV |
1865 | class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino); |
1866 | if (IS_ERR(class_dir)) { | |
1867 | ret = PTR_ERR(class_dir); | |
1868 | class_dir = NULL; | |
3bb56b25 | 1869 | goto err; |
a1c2aa1e | 1870 | } |
3bb56b25 | 1871 | |
a1c2aa1e AV |
1872 | policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino); |
1873 | if (IS_ERR(policycap_dir)) { | |
1874 | ret = PTR_ERR(policycap_dir); | |
1875 | policycap_dir = NULL; | |
3bb56b25 | 1876 | goto err; |
a1c2aa1e | 1877 | } |
b77a493b | 1878 | return 0; |
161ce45a | 1879 | err: |
744ba35e EP |
1880 | printk(KERN_ERR "SELinux: %s: failed while creating inodes\n", |
1881 | __func__); | |
b77a493b | 1882 | return ret; |
1da177e4 LT |
1883 | } |
1884 | ||
fc14f2fe AV |
1885 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
1886 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1887 | { |
fc14f2fe | 1888 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
1889 | } |
1890 | ||
1891 | static struct file_system_type sel_fs_type = { | |
1892 | .name = "selinuxfs", | |
fc14f2fe | 1893 | .mount = sel_mount, |
1da177e4 LT |
1894 | .kill_sb = kill_litter_super, |
1895 | }; | |
1896 | ||
1897 | struct vfsmount *selinuxfs_mount; | |
1898 | ||
1899 | static int __init init_sel_fs(void) | |
1900 | { | |
1901 | int err; | |
1902 | ||
1903 | if (!selinux_enabled) | |
1904 | return 0; | |
7a627e3b | 1905 | |
f9bb4882 EB |
1906 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
1907 | if (err) | |
1908 | return err; | |
7a627e3b | 1909 | |
1da177e4 | 1910 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 1911 | if (err) { |
f9bb4882 | 1912 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 1913 | return err; |
7a627e3b | 1914 | } |
b77a493b | 1915 | |
765927b2 | 1916 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b EP |
1917 | if (IS_ERR(selinuxfs_mount)) { |
1918 | printk(KERN_ERR "selinuxfs: could not mount!\n"); | |
1919 | err = PTR_ERR(selinuxfs_mount); | |
1920 | selinuxfs_mount = NULL; | |
1da177e4 | 1921 | } |
b77a493b | 1922 | |
1da177e4 LT |
1923 | return err; |
1924 | } | |
1925 | ||
1926 | __initcall(init_sel_fs); | |
1927 | ||
1928 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
1929 | void exit_sel_fs(void) | |
1930 | { | |
f9bb4882 | 1931 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
423e0ab0 | 1932 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
1933 | unregister_filesystem(&sel_fs_type); |
1934 | } | |
1935 | #endif |