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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
3 | * | |
1872981b | 4 | * Added conditional policy language extensions |
1da177e4 | 5 | * |
82c21bfa | 6 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
3bb56b25 | 7 | * |
1872981b | 8 | * Added support for the policy capability bitmap |
3bb56b25 PM |
9 | * |
10 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
11 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
12 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
1da177e4 LT |
13 | */ |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/fs.h> | |
920f50b2 | 20 | #include <linux/fs_context.h> |
0619f0f5 | 21 | #include <linux/mount.h> |
bb003079 | 22 | #include <linux/mutex.h> |
0eea6091 | 23 | #include <linux/namei.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/major.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/percpu.h> | |
af601e46 | 30 | #include <linux/audit.h> |
f5269710 | 31 | #include <linux/uaccess.h> |
7a627e3b | 32 | #include <linux/kobject.h> |
0f7e4c33 | 33 | #include <linux/ctype.h> |
1da177e4 LT |
34 | |
35 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
36 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
37 | ||
38 | #include "flask.h" | |
39 | #include "avc.h" | |
40 | #include "avc_ss.h" | |
41 | #include "security.h" | |
42 | #include "objsec.h" | |
43 | #include "conditional.h" | |
2554a48f | 44 | #include "ima.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | enum sel_inos { |
47 | SEL_ROOT_INO = 2, | |
48 | SEL_LOAD, /* load policy */ | |
49 | SEL_ENFORCE, /* get or set enforcing status */ | |
50 | SEL_CONTEXT, /* validate context */ | |
51 | SEL_ACCESS, /* compute access decision */ | |
52 | SEL_CREATE, /* compute create labeling decision */ | |
53 | SEL_RELABEL, /* compute relabeling decision */ | |
54 | SEL_USER, /* compute reachable user contexts */ | |
55 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
56 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
57 | SEL_MLS, /* return if MLS policy is enabled */ | |
58 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
59 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
60 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 61 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
62 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
63 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 64 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 65 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 66 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 67 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
68 | }; |
69 | ||
0619f0f5 SS |
70 | struct selinux_fs_info { |
71 | struct dentry *bool_dir; | |
72 | unsigned int bool_num; | |
73 | char **bool_pending_names; | |
c3fae2b2 | 74 | int *bool_pending_values; |
0619f0f5 SS |
75 | struct dentry *class_dir; |
76 | unsigned long last_class_ino; | |
77 | bool policy_opened; | |
78 | struct dentry *policycap_dir; | |
0619f0f5 | 79 | unsigned long last_ino; |
0619f0f5 SS |
80 | struct super_block *sb; |
81 | }; | |
82 | ||
83 | static int selinux_fs_info_create(struct super_block *sb) | |
84 | { | |
85 | struct selinux_fs_info *fsi; | |
86 | ||
87 | fsi = kzalloc(sizeof(*fsi), GFP_KERNEL); | |
88 | if (!fsi) | |
89 | return -ENOMEM; | |
90 | ||
0619f0f5 | 91 | fsi->last_ino = SEL_INO_NEXT - 1; |
0619f0f5 SS |
92 | fsi->sb = sb; |
93 | sb->s_fs_info = fsi; | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static void selinux_fs_info_free(struct super_block *sb) | |
98 | { | |
99 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
97842c56 | 100 | unsigned int i; |
0619f0f5 SS |
101 | |
102 | if (fsi) { | |
103 | for (i = 0; i < fsi->bool_num; i++) | |
104 | kfree(fsi->bool_pending_names[i]); | |
105 | kfree(fsi->bool_pending_names); | |
106 | kfree(fsi->bool_pending_values); | |
107 | } | |
108 | kfree(sb->s_fs_info); | |
109 | sb->s_fs_info = NULL; | |
110 | } | |
6174eafc | 111 | |
3bb56b25 PM |
112 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
113 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
114 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
115 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
116 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 117 | |
613ba187 DB |
118 | #define BOOL_DIR_NAME "booleans" |
119 | #define CLASS_DIR_NAME "class" | |
120 | #define POLICYCAP_DIR_NAME "policy_capabilities" | |
121 | ||
1da177e4 LT |
122 | #define TMPBUFLEN 12 |
123 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
124 | size_t count, loff_t *ppos) | |
125 | { | |
126 | char tmpbuf[TMPBUFLEN]; | |
127 | ssize_t length; | |
128 | ||
aa8e712c | 129 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
e67b7985 | 130 | enforcing_enabled()); |
1da177e4 LT |
131 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
132 | } | |
133 | ||
134 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 135 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
136 | size_t count, loff_t *ppos) |
137 | ||
138 | { | |
b77a493b | 139 | char *page = NULL; |
1da177e4 | 140 | ssize_t length; |
c867248c CG |
141 | int scan_value; |
142 | bool old_value, new_value; | |
1da177e4 | 143 | |
bfd51626 | 144 | if (count >= PAGE_SIZE) |
8365a719 | 145 | return -ENOMEM; |
b77a493b EP |
146 | |
147 | /* No partial writes. */ | |
b77a493b | 148 | if (*ppos != 0) |
8365a719 | 149 | return -EINVAL; |
b77a493b | 150 | |
8365a719 AV |
151 | page = memdup_user_nul(buf, count); |
152 | if (IS_ERR(page)) | |
153 | return PTR_ERR(page); | |
1da177e4 LT |
154 | |
155 | length = -EINVAL; | |
c867248c | 156 | if (sscanf(page, "%d", &scan_value) != 1) |
1da177e4 LT |
157 | goto out; |
158 | ||
c867248c | 159 | new_value = !!scan_value; |
ea49d10e | 160 | |
e67b7985 | 161 | old_value = enforcing_enabled(); |
aa8e712c | 162 | if (new_value != old_value) { |
e67b7985 | 163 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
164 | SECCLASS_SECURITY, SECURITY__SETENFORCE, |
165 | NULL); | |
1da177e4 LT |
166 | if (length) |
167 | goto out; | |
cdfb6b34 | 168 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 | 169 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
6c5a682e | 170 | " enabled=1 old-enabled=1 lsm=selinux res=1", |
aa8e712c | 171 | new_value, old_value, |
581abc09 | 172 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
6c5a682e | 173 | audit_get_sessionid(current)); |
e67b7985 | 174 | enforcing_set(new_value); |
aa8e712c | 175 | if (new_value) |
e67b7985 | 176 | avc_ss_reset(0); |
aa8e712c | 177 | selnl_notify_setenforce(new_value); |
e67b7985 | 178 | selinux_status_update_setenforce(new_value); |
aa8e712c | 179 | if (!new_value) |
42df744c | 180 | call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL); |
2554a48f | 181 | |
e67b7985 | 182 | selinux_ima_measure_state(); |
1da177e4 LT |
183 | } |
184 | length = count; | |
185 | out: | |
8365a719 | 186 | kfree(page); |
1da177e4 LT |
187 | return length; |
188 | } | |
189 | #else | |
190 | #define sel_write_enforce NULL | |
191 | #endif | |
192 | ||
9c2e08c5 | 193 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
194 | .read = sel_read_enforce, |
195 | .write = sel_write_enforce, | |
57a62c23 | 196 | .llseek = generic_file_llseek, |
1da177e4 LT |
197 | }; |
198 | ||
3f12070e EP |
199 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
200 | size_t count, loff_t *ppos) | |
201 | { | |
202 | char tmpbuf[TMPBUFLEN]; | |
203 | ssize_t length; | |
496ad9aa | 204 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e | 205 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
e67b7985 SS |
206 | security_get_reject_unknown() : |
207 | !security_get_allow_unknown(); | |
3f12070e EP |
208 | |
209 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
210 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
211 | } | |
212 | ||
213 | static const struct file_operations sel_handle_unknown_ops = { | |
214 | .read = sel_read_handle_unknown, | |
57a62c23 | 215 | .llseek = generic_file_llseek, |
3f12070e EP |
216 | }; |
217 | ||
11904167 KK |
218 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
219 | { | |
e67b7985 | 220 | struct page *status = selinux_kernel_status_page(); |
11904167 KK |
221 | |
222 | if (!status) | |
223 | return -ENOMEM; | |
224 | ||
225 | filp->private_data = status; | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
231 | size_t count, loff_t *ppos) | |
232 | { | |
233 | struct page *status = filp->private_data; | |
234 | ||
235 | BUG_ON(!status); | |
236 | ||
237 | return simple_read_from_buffer(buf, count, ppos, | |
238 | page_address(status), | |
239 | sizeof(struct selinux_kernel_status)); | |
240 | } | |
241 | ||
242 | static int sel_mmap_handle_status(struct file *filp, | |
243 | struct vm_area_struct *vma) | |
244 | { | |
245 | struct page *status = filp->private_data; | |
246 | unsigned long size = vma->vm_end - vma->vm_start; | |
247 | ||
248 | BUG_ON(!status); | |
249 | ||
250 | /* only allows one page from the head */ | |
251 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
252 | return -EIO; | |
253 | /* disallow writable mapping */ | |
254 | if (vma->vm_flags & VM_WRITE) | |
255 | return -EPERM; | |
256 | /* disallow mprotect() turns it into writable */ | |
1c71222e | 257 | vm_flags_clear(vma, VM_MAYWRITE); |
11904167 KK |
258 | |
259 | return remap_pfn_range(vma, vma->vm_start, | |
260 | page_to_pfn(status), | |
261 | size, vma->vm_page_prot); | |
262 | } | |
263 | ||
264 | static const struct file_operations sel_handle_status_ops = { | |
265 | .open = sel_open_handle_status, | |
266 | .read = sel_read_handle_status, | |
267 | .mmap = sel_mmap_handle_status, | |
268 | .llseek = generic_file_llseek, | |
269 | }; | |
270 | ||
1872981b | 271 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
272 | size_t count, loff_t *ppos) |
273 | ||
274 | { | |
8365a719 | 275 | char *page; |
1da177e4 LT |
276 | ssize_t length; |
277 | int new_value; | |
89b223bf | 278 | |
bfd51626 | 279 | if (count >= PAGE_SIZE) |
8365a719 | 280 | return -ENOMEM; |
b77a493b EP |
281 | |
282 | /* No partial writes. */ | |
b77a493b | 283 | if (*ppos != 0) |
8365a719 | 284 | return -EINVAL; |
b77a493b | 285 | |
8365a719 AV |
286 | page = memdup_user_nul(buf, count); |
287 | if (IS_ERR(page)) | |
288 | return PTR_ERR(page); | |
1da177e4 | 289 | |
f22f9aaf PM |
290 | if (sscanf(page, "%d", &new_value) != 1) { |
291 | length = -EINVAL; | |
1da177e4 | 292 | goto out; |
f22f9aaf PM |
293 | } |
294 | length = count; | |
1da177e4 LT |
295 | |
296 | if (new_value) { | |
f22f9aaf PM |
297 | pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n"); |
298 | pr_err("SELinux: Runtime disable is not supported, use selinux=0 on the kernel cmdline.\n"); | |
1da177e4 LT |
299 | } |
300 | ||
1da177e4 | 301 | out: |
8365a719 | 302 | kfree(page); |
1da177e4 LT |
303 | return length; |
304 | } | |
1da177e4 | 305 | |
9c2e08c5 | 306 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 307 | .write = sel_write_disable, |
57a62c23 | 308 | .llseek = generic_file_llseek, |
1da177e4 LT |
309 | }; |
310 | ||
311 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 312 | size_t count, loff_t *ppos) |
1da177e4 LT |
313 | { |
314 | char tmpbuf[TMPBUFLEN]; | |
315 | ssize_t length; | |
316 | ||
317 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
318 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
319 | } | |
320 | ||
9c2e08c5 | 321 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 322 | .read = sel_read_policyvers, |
57a62c23 | 323 | .llseek = generic_file_llseek, |
1da177e4 LT |
324 | }; |
325 | ||
326 | /* declaration for sel_write_load */ | |
66ec384a DB |
327 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
328 | unsigned int *bool_num, char ***bool_pending_names, | |
c3fae2b2 | 329 | int **bool_pending_values); |
66ec384a DB |
330 | static int sel_make_classes(struct selinux_policy *newpolicy, |
331 | struct dentry *class_dir, | |
332 | unsigned long *last_class_ino); | |
e47c8fc5 CP |
333 | |
334 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 335 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 336 | unsigned long *ino); |
1da177e4 | 337 | |
0eea6091 | 338 | /* declaration for sel_make_policy_nodes */ |
4a0b33f7 | 339 | static struct dentry *sel_make_swapover_dir(struct super_block *sb, |
0eea6091 DB |
340 | unsigned long *ino); |
341 | ||
1da177e4 LT |
342 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, |
343 | size_t count, loff_t *ppos) | |
344 | { | |
345 | char tmpbuf[TMPBUFLEN]; | |
346 | ssize_t length; | |
347 | ||
0719aaf5 | 348 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
e67b7985 | 349 | security_mls_enabled()); |
1da177e4 LT |
350 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
351 | } | |
352 | ||
9c2e08c5 | 353 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 354 | .read = sel_read_mls, |
57a62c23 | 355 | .llseek = generic_file_llseek, |
1da177e4 LT |
356 | }; |
357 | ||
cee74f47 EP |
358 | struct policy_load_memory { |
359 | size_t len; | |
360 | void *data; | |
361 | }; | |
362 | ||
363 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
364 | { | |
0619f0f5 | 365 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
366 | struct policy_load_memory *plm = NULL; |
367 | int rc; | |
368 | ||
369 | BUG_ON(filp->private_data); | |
370 | ||
e67b7985 | 371 | mutex_lock(&selinux_state.policy_mutex); |
cee74f47 | 372 | |
e67b7985 | 373 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 374 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 EP |
375 | if (rc) |
376 | goto err; | |
377 | ||
378 | rc = -EBUSY; | |
0619f0f5 | 379 | if (fsi->policy_opened) |
cee74f47 EP |
380 | goto err; |
381 | ||
382 | rc = -ENOMEM; | |
383 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
384 | if (!plm) | |
385 | goto err; | |
386 | ||
e67b7985 | 387 | rc = security_read_policy(&plm->data, &plm->len); |
cee74f47 EP |
388 | if (rc) |
389 | goto err; | |
390 | ||
66ccd256 OM |
391 | if ((size_t)i_size_read(inode) != plm->len) { |
392 | inode_lock(inode); | |
393 | i_size_write(inode, plm->len); | |
394 | inode_unlock(inode); | |
395 | } | |
396 | ||
0619f0f5 | 397 | fsi->policy_opened = 1; |
cee74f47 EP |
398 | |
399 | filp->private_data = plm; | |
400 | ||
e67b7985 | 401 | mutex_unlock(&selinux_state.policy_mutex); |
cee74f47 EP |
402 | |
403 | return 0; | |
404 | err: | |
e67b7985 | 405 | mutex_unlock(&selinux_state.policy_mutex); |
cee74f47 EP |
406 | |
407 | if (plm) | |
408 | vfree(plm->data); | |
409 | kfree(plm); | |
410 | return rc; | |
411 | } | |
412 | ||
413 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
414 | { | |
0619f0f5 | 415 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
416 | struct policy_load_memory *plm = filp->private_data; |
417 | ||
418 | BUG_ON(!plm); | |
419 | ||
0619f0f5 | 420 | fsi->policy_opened = 0; |
cee74f47 EP |
421 | |
422 | vfree(plm->data); | |
423 | kfree(plm); | |
424 | ||
425 | return 0; | |
426 | } | |
427 | ||
428 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
429 | size_t count, loff_t *ppos) | |
430 | { | |
431 | struct policy_load_memory *plm = filp->private_data; | |
432 | int ret; | |
433 | ||
e67b7985 | 434 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 435 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 | 436 | if (ret) |
0da74120 | 437 | return ret; |
cee74f47 | 438 | |
0da74120 | 439 | return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); |
cee74f47 EP |
440 | } |
441 | ||
ac9a1f6d | 442 | static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 443 | { |
11bac800 | 444 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
445 | unsigned long offset; |
446 | struct page *page; | |
447 | ||
448 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
449 | return VM_FAULT_SIGBUS; | |
450 | ||
451 | offset = vmf->pgoff << PAGE_SHIFT; | |
452 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
453 | return VM_FAULT_SIGBUS; | |
454 | ||
455 | page = vmalloc_to_page(plm->data + offset); | |
456 | get_page(page); | |
457 | ||
458 | vmf->page = page; | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
7cbea8dc | 463 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
464 | .fault = sel_mmap_policy_fault, |
465 | .page_mkwrite = sel_mmap_policy_fault, | |
466 | }; | |
467 | ||
ad3fa08c | 468 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
469 | { |
470 | if (vma->vm_flags & VM_SHARED) { | |
471 | /* do not allow mprotect to make mapping writable */ | |
1c71222e | 472 | vm_flags_clear(vma, VM_MAYWRITE); |
845ca30f EP |
473 | |
474 | if (vma->vm_flags & VM_WRITE) | |
475 | return -EACCES; | |
476 | } | |
477 | ||
1c71222e | 478 | vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); |
845ca30f EP |
479 | vma->vm_ops = &sel_mmap_policy_ops; |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
cee74f47 EP |
484 | static const struct file_operations sel_policy_ops = { |
485 | .open = sel_open_policy, | |
486 | .read = sel_read_policy, | |
845ca30f | 487 | .mmap = sel_mmap_policy, |
cee74f47 | 488 | .release = sel_release_policy, |
47a93a5b | 489 | .llseek = generic_file_llseek, |
cee74f47 EP |
490 | }; |
491 | ||
0eea6091 | 492 | static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names, |
c3fae2b2 | 493 | int *bool_values) |
aeecf4a3 DB |
494 | { |
495 | u32 i; | |
496 | ||
497 | /* bool_dir cleanup */ | |
0eea6091 DB |
498 | for (i = 0; i < bool_num; i++) |
499 | kfree(bool_names[i]); | |
500 | kfree(bool_names); | |
501 | kfree(bool_values); | |
aeecf4a3 DB |
502 | } |
503 | ||
02a52c5c SS |
504 | static int sel_make_policy_nodes(struct selinux_fs_info *fsi, |
505 | struct selinux_policy *newpolicy) | |
0619f0f5 | 506 | { |
0eea6091 | 507 | int ret = 0; |
4a0b33f7 AV |
508 | struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir; |
509 | unsigned int bool_num = 0; | |
510 | char **bool_names = NULL; | |
511 | int *bool_values = NULL; | |
0eea6091 DB |
512 | unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */ |
513 | ||
4a0b33f7 | 514 | tmp_parent = sel_make_swapover_dir(fsi->sb, &tmp_ino); |
0eea6091 DB |
515 | if (IS_ERR(tmp_parent)) |
516 | return PTR_ERR(tmp_parent); | |
517 | ||
518 | tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ | |
519 | tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino); | |
520 | if (IS_ERR(tmp_bool_dir)) { | |
521 | ret = PTR_ERR(tmp_bool_dir); | |
522 | goto out; | |
523 | } | |
0619f0f5 | 524 | |
0eea6091 DB |
525 | tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ |
526 | tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino); | |
527 | if (IS_ERR(tmp_class_dir)) { | |
528 | ret = PTR_ERR(tmp_class_dir); | |
529 | goto out; | |
530 | } | |
aeecf4a3 | 531 | |
4a0b33f7 AV |
532 | ret = sel_make_bools(newpolicy, tmp_bool_dir, &bool_num, |
533 | &bool_names, &bool_values); | |
ee5de60a | 534 | if (ret) |
0eea6091 | 535 | goto out; |
0619f0f5 | 536 | |
0eea6091 | 537 | ret = sel_make_classes(newpolicy, tmp_class_dir, |
66ec384a | 538 | &fsi->last_class_ino); |
ee5de60a | 539 | if (ret) |
0eea6091 | 540 | goto out; |
0619f0f5 | 541 | |
4a0b33f7 AV |
542 | lock_rename(tmp_parent, fsi->sb->s_root); |
543 | ||
0eea6091 | 544 | /* booleans */ |
0eea6091 DB |
545 | d_exchange(tmp_bool_dir, fsi->bool_dir); |
546 | ||
4a0b33f7 AV |
547 | swap(fsi->bool_num, bool_num); |
548 | swap(fsi->bool_pending_names, bool_names); | |
549 | swap(fsi->bool_pending_values, bool_values); | |
0eea6091 DB |
550 | |
551 | fsi->bool_dir = tmp_bool_dir; | |
0eea6091 DB |
552 | |
553 | /* classes */ | |
0eea6091 DB |
554 | d_exchange(tmp_class_dir, fsi->class_dir); |
555 | fsi->class_dir = tmp_class_dir; | |
4a0b33f7 AV |
556 | |
557 | unlock_rename(tmp_parent, fsi->sb->s_root); | |
0eea6091 DB |
558 | |
559 | out: | |
4a0b33f7 | 560 | sel_remove_old_bool_data(bool_num, bool_names, bool_values); |
0eea6091 DB |
561 | /* Since the other temporary dirs are children of tmp_parent |
562 | * this will handle all the cleanup in the case of a failure before | |
563 | * the swapover | |
564 | */ | |
4a0b33f7 | 565 | simple_recursive_removal(tmp_parent, NULL); |
0eea6091 DB |
566 | |
567 | return ret; | |
0619f0f5 SS |
568 | } |
569 | ||
1872981b | 570 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
571 | size_t count, loff_t *ppos) |
572 | ||
573 | { | |
42c77323 | 574 | struct selinux_fs_info *fsi; |
6406887a | 575 | struct selinux_load_state load_state; |
1da177e4 LT |
576 | ssize_t length; |
577 | void *data = NULL; | |
578 | ||
42c77323 PM |
579 | /* no partial writes */ |
580 | if (*ppos) | |
581 | return -EINVAL; | |
582 | /* no empty policies */ | |
583 | if (!count) | |
584 | return -EINVAL; | |
585 | ||
e67b7985 | 586 | mutex_lock(&selinux_state.policy_mutex); |
1da177e4 | 587 | |
e67b7985 | 588 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 589 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); |
1da177e4 LT |
590 | if (length) |
591 | goto out; | |
592 | ||
b77a493b | 593 | data = vmalloc(count); |
42c77323 PM |
594 | if (!data) { |
595 | length = -ENOMEM; | |
1da177e4 | 596 | goto out; |
42c77323 PM |
597 | } |
598 | if (copy_from_user(data, buf, count) != 0) { | |
599 | length = -EFAULT; | |
1da177e4 | 600 | goto out; |
42c77323 | 601 | } |
1da177e4 | 602 | |
e67b7985 | 603 | length = security_load_policy(data, count, &load_state); |
4262fb51 GT |
604 | if (length) { |
605 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 606 | goto out; |
4262fb51 | 607 | } |
42c77323 | 608 | fsi = file_inode(file)->i_sb->s_fs_info; |
6406887a | 609 | length = sel_make_policy_nodes(fsi, load_state.policy); |
02a52c5c | 610 | if (length) { |
ee5de60a | 611 | pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n"); |
e67b7985 | 612 | selinux_policy_cancel(&load_state); |
519dad3b | 613 | goto out; |
02a52c5c SS |
614 | } |
615 | ||
e67b7985 | 616 | selinux_policy_commit(&load_state); |
b77a493b | 617 | length = count; |
cdfb6b34 | 618 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
d141136f | 619 | "auid=%u ses=%u lsm=selinux res=1", |
581abc09 | 620 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 621 | audit_get_sessionid(current)); |
42c77323 | 622 | |
1da177e4 | 623 | out: |
e67b7985 | 624 | mutex_unlock(&selinux_state.policy_mutex); |
1da177e4 LT |
625 | vfree(data); |
626 | return length; | |
627 | } | |
628 | ||
9c2e08c5 | 629 | static const struct file_operations sel_load_ops = { |
1da177e4 | 630 | .write = sel_write_load, |
57a62c23 | 631 | .llseek = generic_file_llseek, |
1da177e4 LT |
632 | }; |
633 | ||
1872981b | 634 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 635 | { |
b77a493b | 636 | char *canon = NULL; |
ce9982d0 | 637 | u32 sid, len; |
1da177e4 LT |
638 | ssize_t length; |
639 | ||
e67b7985 | 640 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 641 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); |
1da177e4 | 642 | if (length) |
b77a493b | 643 | goto out; |
1da177e4 | 644 | |
e67b7985 | 645 | length = security_context_to_sid(buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
646 | if (length) |
647 | goto out; | |
1da177e4 | 648 | |
e67b7985 | 649 | length = security_sid_to_context(sid, &canon, &len); |
b77a493b EP |
650 | if (length) |
651 | goto out; | |
ce9982d0 | 652 | |
b77a493b | 653 | length = -ERANGE; |
ce9982d0 | 654 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 655 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 656 | "payload max\n", __func__, len); |
1da177e4 | 657 | goto out; |
ce9982d0 | 658 | } |
1da177e4 | 659 | |
ce9982d0 SS |
660 | memcpy(buf, canon, len); |
661 | length = len; | |
1da177e4 | 662 | out: |
ce9982d0 | 663 | kfree(canon); |
1da177e4 LT |
664 | return length; |
665 | } | |
666 | ||
1da177e4 LT |
667 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
668 | size_t count, loff_t *ppos) | |
669 | { | |
670 | char tmpbuf[TMPBUFLEN]; | |
671 | ssize_t length; | |
672 | ||
8861d0af | 673 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e67b7985 | 674 | checkreqprot_get()); |
1da177e4 LT |
675 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
676 | } | |
677 | ||
1872981b | 678 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
679 | size_t count, loff_t *ppos) |
680 | { | |
8365a719 | 681 | char *page; |
1da177e4 LT |
682 | ssize_t length; |
683 | unsigned int new_value; | |
684 | ||
e67b7985 | 685 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
686 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, |
687 | NULL); | |
1da177e4 | 688 | if (length) |
8365a719 | 689 | return length; |
1da177e4 | 690 | |
bfd51626 | 691 | if (count >= PAGE_SIZE) |
8365a719 | 692 | return -ENOMEM; |
b77a493b EP |
693 | |
694 | /* No partial writes. */ | |
b77a493b | 695 | if (*ppos != 0) |
8365a719 | 696 | return -EINVAL; |
b77a493b | 697 | |
8365a719 AV |
698 | page = memdup_user_nul(buf, count); |
699 | if (IS_ERR(page)) | |
700 | return PTR_ERR(page); | |
1da177e4 | 701 | |
a7e4676e PM |
702 | if (sscanf(page, "%u", &new_value) != 1) { |
703 | length = -EINVAL; | |
1da177e4 | 704 | goto out; |
a7e4676e PM |
705 | } |
706 | length = count; | |
1da177e4 | 707 | |
e9c38f9f SS |
708 | if (new_value) { |
709 | char comm[sizeof(current->comm)]; | |
710 | ||
711 | memcpy(comm, current->comm, sizeof(comm)); | |
a7e4676e | 712 | pr_err("SELinux: %s (%d) set checkreqprot to 1. This is no longer supported.\n", |
81200b02 | 713 | comm, current->pid); |
e9c38f9f SS |
714 | } |
715 | ||
e67b7985 | 716 | selinux_ima_measure_state(); |
2554a48f | 717 | |
1da177e4 | 718 | out: |
8365a719 | 719 | kfree(page); |
1da177e4 LT |
720 | return length; |
721 | } | |
9c2e08c5 | 722 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
723 | .read = sel_read_checkreqprot, |
724 | .write = sel_write_checkreqprot, | |
57a62c23 | 725 | .llseek = generic_file_llseek, |
1da177e4 LT |
726 | }; |
727 | ||
f9df6458 AP |
728 | static ssize_t sel_write_validatetrans(struct file *file, |
729 | const char __user *buf, | |
730 | size_t count, loff_t *ppos) | |
731 | { | |
732 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; | |
733 | char *req = NULL; | |
734 | u32 osid, nsid, tsid; | |
735 | u16 tclass; | |
736 | int rc; | |
737 | ||
e67b7985 | 738 | rc = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 739 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); |
f9df6458 AP |
740 | if (rc) |
741 | goto out; | |
742 | ||
743 | rc = -ENOMEM; | |
744 | if (count >= PAGE_SIZE) | |
745 | goto out; | |
746 | ||
747 | /* No partial writes. */ | |
748 | rc = -EINVAL; | |
749 | if (*ppos != 0) | |
750 | goto out; | |
751 | ||
0b884d25 AV |
752 | req = memdup_user_nul(buf, count); |
753 | if (IS_ERR(req)) { | |
754 | rc = PTR_ERR(req); | |
755 | req = NULL; | |
f9df6458 | 756 | goto out; |
0b884d25 | 757 | } |
f9df6458 AP |
758 | |
759 | rc = -ENOMEM; | |
760 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
761 | if (!oldcon) | |
762 | goto out; | |
763 | ||
764 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
765 | if (!newcon) | |
766 | goto out; | |
767 | ||
768 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
769 | if (!taskcon) | |
770 | goto out; | |
771 | ||
772 | rc = -EINVAL; | |
773 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
774 | goto out; | |
775 | ||
e67b7985 | 776 | rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL); |
f9df6458 AP |
777 | if (rc) |
778 | goto out; | |
779 | ||
e67b7985 | 780 | rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL); |
f9df6458 AP |
781 | if (rc) |
782 | goto out; | |
783 | ||
e67b7985 | 784 | rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL); |
f9df6458 AP |
785 | if (rc) |
786 | goto out; | |
787 | ||
e67b7985 | 788 | rc = security_validate_transition_user(osid, nsid, tsid, tclass); |
f9df6458 AP |
789 | if (!rc) |
790 | rc = count; | |
791 | out: | |
792 | kfree(req); | |
793 | kfree(oldcon); | |
794 | kfree(newcon); | |
795 | kfree(taskcon); | |
796 | return rc; | |
797 | } | |
798 | ||
799 | static const struct file_operations sel_transition_ops = { | |
800 | .write = sel_write_validatetrans, | |
801 | .llseek = generic_file_llseek, | |
802 | }; | |
803 | ||
1da177e4 LT |
804 | /* |
805 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
806 | */ | |
1872981b EP |
807 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
808 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
809 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
810 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
811 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 | 812 | |
631d2b49 | 813 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
1da177e4 LT |
814 | [SEL_ACCESS] = sel_write_access, |
815 | [SEL_CREATE] = sel_write_create, | |
816 | [SEL_RELABEL] = sel_write_relabel, | |
817 | [SEL_USER] = sel_write_user, | |
818 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 819 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
820 | }; |
821 | ||
822 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
823 | { | |
496ad9aa | 824 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
825 | char *data; |
826 | ssize_t rv; | |
827 | ||
6e20a64a | 828 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
829 | return -EINVAL; |
830 | ||
831 | data = simple_transaction_get(file, buf, size); | |
832 | if (IS_ERR(data)) | |
833 | return PTR_ERR(data); | |
834 | ||
1872981b EP |
835 | rv = write_op[ino](file, data, size); |
836 | if (rv > 0) { | |
1da177e4 LT |
837 | simple_transaction_set(file, rv); |
838 | rv = size; | |
839 | } | |
840 | return rv; | |
841 | } | |
842 | ||
9c2e08c5 | 843 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
844 | .write = selinux_transaction_write, |
845 | .read = simple_transaction_read, | |
846 | .release = simple_transaction_release, | |
57a62c23 | 847 | .llseek = generic_file_llseek, |
1da177e4 LT |
848 | }; |
849 | ||
850 | /* | |
851 | * payload - write methods | |
852 | * If the method has a response, the response should be put in buf, | |
853 | * and the length returned. Otherwise return 0 or and -error. | |
854 | */ | |
855 | ||
1872981b | 856 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 857 | { |
b77a493b | 858 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
859 | u32 ssid, tsid; |
860 | u16 tclass; | |
1da177e4 LT |
861 | struct av_decision avd; |
862 | ssize_t length; | |
863 | ||
e67b7985 | 864 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 | 865 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); |
1da177e4 | 866 | if (length) |
b77a493b | 867 | goto out; |
1da177e4 LT |
868 | |
869 | length = -ENOMEM; | |
c1a7368a | 870 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 871 | if (!scon) |
b77a493b | 872 | goto out; |
1da177e4 | 873 | |
b77a493b | 874 | length = -ENOMEM; |
c1a7368a | 875 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
876 | if (!tcon) |
877 | goto out; | |
1da177e4 LT |
878 | |
879 | length = -EINVAL; | |
19439d05 | 880 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 881 | goto out; |
1da177e4 | 882 | |
e67b7985 | 883 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
884 | if (length) |
885 | goto out; | |
886 | ||
e67b7985 | 887 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
888 | if (length) |
889 | goto out; | |
1da177e4 | 890 | |
e67b7985 | 891 | security_compute_av_user(ssid, tsid, tclass, &avd); |
1da177e4 LT |
892 | |
893 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 894 | "%x %x %x %x %u %x", |
f1c6381a | 895 | avd.allowed, 0xffffffff, |
1da177e4 | 896 | avd.auditallow, avd.auditdeny, |
8a6f83af | 897 | avd.seqno, avd.flags); |
1da177e4 | 898 | out: |
b77a493b | 899 | kfree(tcon); |
1da177e4 LT |
900 | kfree(scon); |
901 | return length; | |
902 | } | |
903 | ||
1872981b | 904 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 905 | { |
b77a493b | 906 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 907 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
908 | u32 ssid, tsid, newsid; |
909 | u16 tclass; | |
910 | ssize_t length; | |
b77a493b | 911 | char *newcon = NULL; |
1da177e4 | 912 | u32 len; |
f50a3ec9 | 913 | int nargs; |
1da177e4 | 914 | |
e67b7985 | 915 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
916 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, |
917 | NULL); | |
1da177e4 | 918 | if (length) |
b77a493b | 919 | goto out; |
1da177e4 LT |
920 | |
921 | length = -ENOMEM; | |
c1a7368a | 922 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 923 | if (!scon) |
b77a493b | 924 | goto out; |
1da177e4 | 925 | |
b77a493b | 926 | length = -ENOMEM; |
c1a7368a | 927 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
928 | if (!tcon) |
929 | goto out; | |
1da177e4 | 930 | |
f50a3ec9 KK |
931 | length = -ENOMEM; |
932 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
933 | if (!namebuf) | |
934 | goto out; | |
935 | ||
1da177e4 | 936 | length = -EINVAL; |
f50a3ec9 KK |
937 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
938 | if (nargs < 3 || nargs > 4) | |
b77a493b | 939 | goto out; |
0f7e4c33 KK |
940 | if (nargs == 4) { |
941 | /* | |
942 | * If and when the name of new object to be queried contains | |
943 | * either whitespace or multibyte characters, they shall be | |
944 | * encoded based on the percentage-encoding rule. | |
945 | * If not encoded, the sscanf logic picks up only left-half | |
3d9047a0 | 946 | * of the supplied name; split by a whitespace unexpectedly. |
0f7e4c33 KK |
947 | */ |
948 | char *r, *w; | |
949 | int c1, c2; | |
950 | ||
951 | r = w = namebuf; | |
952 | do { | |
953 | c1 = *r++; | |
954 | if (c1 == '+') | |
955 | c1 = ' '; | |
956 | else if (c1 == '%') { | |
af7ff2c2 AS |
957 | c1 = hex_to_bin(*r++); |
958 | if (c1 < 0) | |
0f7e4c33 | 959 | goto out; |
af7ff2c2 AS |
960 | c2 = hex_to_bin(*r++); |
961 | if (c2 < 0) | |
0f7e4c33 KK |
962 | goto out; |
963 | c1 = (c1 << 4) | c2; | |
964 | } | |
965 | *w++ = c1; | |
966 | } while (c1 != '\0'); | |
967 | ||
f50a3ec9 | 968 | objname = namebuf; |
0f7e4c33 | 969 | } |
1da177e4 | 970 | |
e67b7985 | 971 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
972 | if (length) |
973 | goto out; | |
974 | ||
e67b7985 | 975 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
976 | if (length) |
977 | goto out; | |
1da177e4 | 978 | |
e67b7985 | 979 | length = security_transition_sid_user(ssid, tsid, tclass, |
0619f0f5 | 980 | objname, &newsid); |
b77a493b EP |
981 | if (length) |
982 | goto out; | |
1da177e4 | 983 | |
e67b7985 | 984 | length = security_sid_to_context(newsid, &newcon, &len); |
b77a493b EP |
985 | if (length) |
986 | goto out; | |
1da177e4 | 987 | |
b77a493b | 988 | length = -ERANGE; |
1da177e4 | 989 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 990 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 991 | "payload max\n", __func__, len); |
b77a493b | 992 | goto out; |
1da177e4 LT |
993 | } |
994 | ||
995 | memcpy(buf, newcon, len); | |
996 | length = len; | |
b77a493b | 997 | out: |
1da177e4 | 998 | kfree(newcon); |
f50a3ec9 | 999 | kfree(namebuf); |
1da177e4 | 1000 | kfree(tcon); |
1da177e4 LT |
1001 | kfree(scon); |
1002 | return length; | |
1003 | } | |
1004 | ||
1872981b | 1005 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 1006 | { |
b77a493b | 1007 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1008 | u32 ssid, tsid, newsid; |
1009 | u16 tclass; | |
1010 | ssize_t length; | |
b77a493b | 1011 | char *newcon = NULL; |
1da177e4 LT |
1012 | u32 len; |
1013 | ||
e67b7985 | 1014 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1015 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, |
1016 | NULL); | |
1da177e4 | 1017 | if (length) |
b77a493b | 1018 | goto out; |
1da177e4 LT |
1019 | |
1020 | length = -ENOMEM; | |
c1a7368a | 1021 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1022 | if (!scon) |
b77a493b | 1023 | goto out; |
1da177e4 | 1024 | |
b77a493b | 1025 | length = -ENOMEM; |
c1a7368a | 1026 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1027 | if (!tcon) |
1028 | goto out; | |
1da177e4 LT |
1029 | |
1030 | length = -EINVAL; | |
1031 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1032 | goto out; |
1da177e4 | 1033 | |
e67b7985 | 1034 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1035 | if (length) |
1036 | goto out; | |
1037 | ||
e67b7985 | 1038 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1039 | if (length) |
1040 | goto out; | |
1da177e4 | 1041 | |
e67b7985 | 1042 | length = security_change_sid(ssid, tsid, tclass, &newsid); |
b77a493b EP |
1043 | if (length) |
1044 | goto out; | |
1da177e4 | 1045 | |
e67b7985 | 1046 | length = security_sid_to_context(newsid, &newcon, &len); |
b77a493b EP |
1047 | if (length) |
1048 | goto out; | |
1da177e4 | 1049 | |
b77a493b EP |
1050 | length = -ERANGE; |
1051 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
1052 | goto out; | |
1da177e4 LT |
1053 | |
1054 | memcpy(buf, newcon, len); | |
1055 | length = len; | |
b77a493b | 1056 | out: |
1da177e4 | 1057 | kfree(newcon); |
1da177e4 | 1058 | kfree(tcon); |
1da177e4 LT |
1059 | kfree(scon); |
1060 | return length; | |
1061 | } | |
1062 | ||
1872981b | 1063 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 1064 | { |
b77a493b EP |
1065 | char *con = NULL, *user = NULL, *ptr; |
1066 | u32 sid, *sids = NULL; | |
1da177e4 LT |
1067 | ssize_t length; |
1068 | char *newcon; | |
97842c56 CG |
1069 | int rc; |
1070 | u32 i, len, nsids; | |
1da177e4 | 1071 | |
e67b7985 | 1072 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1073 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, |
1074 | NULL); | |
1da177e4 | 1075 | if (length) |
6eab04a8 | 1076 | goto out; |
1da177e4 LT |
1077 | |
1078 | length = -ENOMEM; | |
c1a7368a | 1079 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1080 | if (!con) |
6eab04a8 | 1081 | goto out; |
1da177e4 | 1082 | |
b77a493b | 1083 | length = -ENOMEM; |
c1a7368a | 1084 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1085 | if (!user) |
1086 | goto out; | |
1da177e4 LT |
1087 | |
1088 | length = -EINVAL; | |
1089 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 1090 | goto out; |
1da177e4 | 1091 | |
e67b7985 | 1092 | length = security_context_str_to_sid(con, &sid, GFP_KERNEL); |
b77a493b EP |
1093 | if (length) |
1094 | goto out; | |
1da177e4 | 1095 | |
e67b7985 | 1096 | length = security_get_user_sids(sid, user, &sids, &nsids); |
b77a493b EP |
1097 | if (length) |
1098 | goto out; | |
1da177e4 LT |
1099 | |
1100 | length = sprintf(buf, "%u", nsids) + 1; | |
1101 | ptr = buf + length; | |
1102 | for (i = 0; i < nsids; i++) { | |
e67b7985 | 1103 | rc = security_sid_to_context(sids[i], &newcon, &len); |
1da177e4 LT |
1104 | if (rc) { |
1105 | length = rc; | |
b77a493b | 1106 | goto out; |
1da177e4 LT |
1107 | } |
1108 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1109 | kfree(newcon); | |
1110 | length = -ERANGE; | |
b77a493b | 1111 | goto out; |
1da177e4 LT |
1112 | } |
1113 | memcpy(ptr, newcon, len); | |
1114 | kfree(newcon); | |
1115 | ptr += len; | |
1116 | length += len; | |
1117 | } | |
b77a493b | 1118 | out: |
1da177e4 | 1119 | kfree(sids); |
1da177e4 | 1120 | kfree(user); |
1da177e4 LT |
1121 | kfree(con); |
1122 | return length; | |
1123 | } | |
1124 | ||
1872981b | 1125 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1126 | { |
b77a493b | 1127 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1128 | u32 ssid, tsid, newsid; |
1129 | u16 tclass; | |
1130 | ssize_t length; | |
b77a493b | 1131 | char *newcon = NULL; |
1da177e4 LT |
1132 | u32 len; |
1133 | ||
e67b7985 | 1134 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1135 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, |
1136 | NULL); | |
1da177e4 | 1137 | if (length) |
b77a493b | 1138 | goto out; |
1da177e4 LT |
1139 | |
1140 | length = -ENOMEM; | |
c1a7368a | 1141 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1142 | if (!scon) |
6eab04a8 | 1143 | goto out; |
1da177e4 | 1144 | |
b77a493b | 1145 | length = -ENOMEM; |
c1a7368a | 1146 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1147 | if (!tcon) |
1148 | goto out; | |
1da177e4 LT |
1149 | |
1150 | length = -EINVAL; | |
1151 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1152 | goto out; |
1da177e4 | 1153 | |
e67b7985 | 1154 | length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1155 | if (length) |
1156 | goto out; | |
1157 | ||
e67b7985 | 1158 | length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1159 | if (length) |
1160 | goto out; | |
1da177e4 | 1161 | |
e67b7985 | 1162 | length = security_member_sid(ssid, tsid, tclass, &newsid); |
b77a493b EP |
1163 | if (length) |
1164 | goto out; | |
1da177e4 | 1165 | |
e67b7985 | 1166 | length = security_sid_to_context(newsid, &newcon, &len); |
b77a493b EP |
1167 | if (length) |
1168 | goto out; | |
1da177e4 | 1169 | |
b77a493b | 1170 | length = -ERANGE; |
1da177e4 | 1171 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1172 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1173 | "payload max\n", __func__, len); |
b77a493b | 1174 | goto out; |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | memcpy(buf, newcon, len); | |
1178 | length = len; | |
b77a493b | 1179 | out: |
1da177e4 | 1180 | kfree(newcon); |
1da177e4 | 1181 | kfree(tcon); |
1da177e4 LT |
1182 | kfree(scon); |
1183 | return length; | |
1184 | } | |
1185 | ||
97842c56 | 1186 | static struct inode *sel_make_inode(struct super_block *sb, umode_t mode) |
1da177e4 LT |
1187 | { |
1188 | struct inode *ret = new_inode(sb); | |
1189 | ||
1190 | if (ret) { | |
1191 | ret->i_mode = mode; | |
26d12831 | 1192 | simple_inode_init_ts(ret); |
1da177e4 LT |
1193 | } |
1194 | return ret; | |
1195 | } | |
1196 | ||
1da177e4 LT |
1197 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1198 | size_t count, loff_t *ppos) | |
1199 | { | |
0619f0f5 | 1200 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 LT |
1201 | char *page = NULL; |
1202 | ssize_t length; | |
1da177e4 LT |
1203 | ssize_t ret; |
1204 | int cur_enforcing; | |
496ad9aa | 1205 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1206 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1207 | |
e67b7985 | 1208 | mutex_lock(&selinux_state.policy_mutex); |
1da177e4 | 1209 | |
b77a493b | 1210 | ret = -EINVAL; |
0619f0f5 SS |
1211 | if (index >= fsi->bool_num || strcmp(name, |
1212 | fsi->bool_pending_names[index])) | |
0da74120 | 1213 | goto out_unlock; |
1da177e4 | 1214 | |
b77a493b | 1215 | ret = -ENOMEM; |
1872981b | 1216 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1217 | if (!page) |
0da74120 | 1218 | goto out_unlock; |
1da177e4 | 1219 | |
e67b7985 | 1220 | cur_enforcing = security_get_bool_value(index); |
1da177e4 LT |
1221 | if (cur_enforcing < 0) { |
1222 | ret = cur_enforcing; | |
0da74120 | 1223 | goto out_unlock; |
1da177e4 | 1224 | } |
1da177e4 | 1225 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
0619f0f5 | 1226 | fsi->bool_pending_values[index]); |
e67b7985 | 1227 | mutex_unlock(&selinux_state.policy_mutex); |
0da74120 JH |
1228 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1229 | out_free: | |
b77a493b | 1230 | free_page((unsigned long)page); |
1da177e4 | 1231 | return ret; |
0da74120 JH |
1232 | |
1233 | out_unlock: | |
e67b7985 | 1234 | mutex_unlock(&selinux_state.policy_mutex); |
0da74120 | 1235 | goto out_free; |
1da177e4 LT |
1236 | } |
1237 | ||
1238 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1239 | size_t count, loff_t *ppos) | |
1240 | { | |
0619f0f5 | 1241 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1242 | char *page = NULL; |
d313f948 | 1243 | ssize_t length; |
1da177e4 | 1244 | int new_value; |
496ad9aa | 1245 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1246 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1247 | |
0da74120 JH |
1248 | if (count >= PAGE_SIZE) |
1249 | return -ENOMEM; | |
1250 | ||
1251 | /* No partial writes. */ | |
1252 | if (*ppos != 0) | |
1253 | return -EINVAL; | |
1254 | ||
1255 | page = memdup_user_nul(buf, count); | |
1256 | if (IS_ERR(page)) | |
1257 | return PTR_ERR(page); | |
1258 | ||
e67b7985 | 1259 | mutex_lock(&selinux_state.policy_mutex); |
1da177e4 | 1260 | |
e67b7985 | 1261 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1262 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1263 | NULL); | |
1da177e4 LT |
1264 | if (length) |
1265 | goto out; | |
1266 | ||
b77a493b | 1267 | length = -EINVAL; |
0619f0f5 SS |
1268 | if (index >= fsi->bool_num || strcmp(name, |
1269 | fsi->bool_pending_names[index])) | |
d313f948 | 1270 | goto out; |
d313f948 | 1271 | |
1da177e4 LT |
1272 | length = -EINVAL; |
1273 | if (sscanf(page, "%d", &new_value) != 1) | |
1274 | goto out; | |
1275 | ||
1276 | if (new_value) | |
1277 | new_value = 1; | |
1278 | ||
0619f0f5 | 1279 | fsi->bool_pending_values[index] = new_value; |
1da177e4 LT |
1280 | length = count; |
1281 | ||
1282 | out: | |
e67b7985 | 1283 | mutex_unlock(&selinux_state.policy_mutex); |
8365a719 | 1284 | kfree(page); |
1da177e4 LT |
1285 | return length; |
1286 | } | |
1287 | ||
9c2e08c5 | 1288 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1289 | .read = sel_read_bool, |
1290 | .write = sel_write_bool, | |
57a62c23 | 1291 | .llseek = generic_file_llseek, |
1da177e4 LT |
1292 | }; |
1293 | ||
1294 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1295 | const char __user *buf, | |
1296 | size_t count, loff_t *ppos) | |
1297 | { | |
0619f0f5 | 1298 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1299 | char *page = NULL; |
d313f948 | 1300 | ssize_t length; |
1da177e4 LT |
1301 | int new_value; |
1302 | ||
0da74120 JH |
1303 | if (count >= PAGE_SIZE) |
1304 | return -ENOMEM; | |
1305 | ||
1306 | /* No partial writes. */ | |
1307 | if (*ppos != 0) | |
1308 | return -EINVAL; | |
1309 | ||
1310 | page = memdup_user_nul(buf, count); | |
1311 | if (IS_ERR(page)) | |
1312 | return PTR_ERR(page); | |
1313 | ||
e67b7985 | 1314 | mutex_lock(&selinux_state.policy_mutex); |
1da177e4 | 1315 | |
e67b7985 | 1316 | length = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1317 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1318 | NULL); | |
1da177e4 LT |
1319 | if (length) |
1320 | goto out; | |
1321 | ||
1da177e4 LT |
1322 | length = -EINVAL; |
1323 | if (sscanf(page, "%d", &new_value) != 1) | |
1324 | goto out; | |
1325 | ||
b77a493b | 1326 | length = 0; |
0619f0f5 | 1327 | if (new_value && fsi->bool_pending_values) |
e67b7985 | 1328 | length = security_set_bools(fsi->bool_num, |
0619f0f5 | 1329 | fsi->bool_pending_values); |
1da177e4 | 1330 | |
b77a493b EP |
1331 | if (!length) |
1332 | length = count; | |
1da177e4 LT |
1333 | |
1334 | out: | |
e67b7985 | 1335 | mutex_unlock(&selinux_state.policy_mutex); |
8365a719 | 1336 | kfree(page); |
1da177e4 LT |
1337 | return length; |
1338 | } | |
1339 | ||
9c2e08c5 | 1340 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1341 | .write = sel_commit_bools_write, |
57a62c23 | 1342 | .llseek = generic_file_llseek, |
1da177e4 LT |
1343 | }; |
1344 | ||
66ec384a DB |
1345 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
1346 | unsigned int *bool_num, char ***bool_pending_names, | |
c3fae2b2 | 1347 | int **bool_pending_values) |
1da177e4 | 1348 | { |
60abd318 | 1349 | int ret; |
4a0b33f7 | 1350 | char **names, *page; |
60abd318 | 1351 | u32 i, num; |
1da177e4 | 1352 | |
1872981b EP |
1353 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1354 | if (!page) | |
4a0b33f7 | 1355 | return -ENOMEM; |
1da177e4 | 1356 | |
4a0b33f7 | 1357 | ret = security_get_bools(newpolicy, &num, &names, bool_pending_values); |
b77a493b | 1358 | if (ret) |
1da177e4 LT |
1359 | goto out; |
1360 | ||
4a0b33f7 AV |
1361 | *bool_num = num; |
1362 | *bool_pending_names = names; | |
1363 | ||
1da177e4 | 1364 | for (i = 0; i < num; i++) { |
4a0b33f7 AV |
1365 | struct dentry *dentry; |
1366 | struct inode *inode; | |
1367 | struct inode_security_struct *isec; | |
1368 | ssize_t len; | |
1369 | u32 sid; | |
1370 | ||
1371 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); | |
1372 | if (len >= PAGE_SIZE) { | |
1373 | ret = -ENAMETOOLONG; | |
1374 | break; | |
1375 | } | |
66ec384a | 1376 | dentry = d_alloc_name(bool_dir, names[i]); |
4a0b33f7 AV |
1377 | if (!dentry) { |
1378 | ret = -ENOMEM; | |
1379 | break; | |
1380 | } | |
b77a493b | 1381 | |
66ec384a | 1382 | inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
7e4237fa | 1383 | if (!inode) { |
1384 | dput(dentry); | |
4a0b33f7 AV |
1385 | ret = -ENOMEM; |
1386 | break; | |
7e4237fa | 1387 | } |
b77a493b | 1388 | |
80788c22 | 1389 | isec = selinux_inode(inode); |
02a52c5c | 1390 | ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page, |
aa8e712c | 1391 | SECCLASS_FILE, &sid); |
4262fb51 | 1392 | if (ret) { |
900fde06 GT |
1393 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1394 | page); | |
1395 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1396 | } |
1397 | ||
1da177e4 | 1398 | isec->sid = sid; |
42059112 | 1399 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1400 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1401 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1402 | d_add(dentry, inode); |
1403 | } | |
1da177e4 LT |
1404 | out: |
1405 | free_page((unsigned long)page); | |
b77a493b | 1406 | return ret; |
1da177e4 LT |
1407 | } |
1408 | ||
1da177e4 LT |
1409 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
1410 | size_t count, loff_t *ppos) | |
1411 | { | |
1412 | char tmpbuf[TMPBUFLEN]; | |
1413 | ssize_t length; | |
1414 | ||
6b6bc620 | 1415 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e67b7985 | 1416 | avc_get_cache_threshold()); |
1da177e4 LT |
1417 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1418 | } | |
1419 | ||
1872981b EP |
1420 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1421 | const char __user *buf, | |
1da177e4 LT |
1422 | size_t count, loff_t *ppos) |
1423 | ||
1424 | { | |
8365a719 | 1425 | char *page; |
1da177e4 | 1426 | ssize_t ret; |
309c5fad | 1427 | unsigned int new_value; |
1da177e4 | 1428 | |
e67b7985 | 1429 | ret = avc_has_perm(current_sid(), SECINITSID_SECURITY, |
be0554c9 SS |
1430 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, |
1431 | NULL); | |
b77a493b | 1432 | if (ret) |
8365a719 | 1433 | return ret; |
1da177e4 | 1434 | |
b77a493b | 1435 | if (count >= PAGE_SIZE) |
8365a719 | 1436 | return -ENOMEM; |
1da177e4 | 1437 | |
b77a493b | 1438 | /* No partial writes. */ |
b77a493b | 1439 | if (*ppos != 0) |
8365a719 | 1440 | return -EINVAL; |
1da177e4 | 1441 | |
8365a719 AV |
1442 | page = memdup_user_nul(buf, count); |
1443 | if (IS_ERR(page)) | |
1444 | return PTR_ERR(page); | |
1da177e4 | 1445 | |
b77a493b EP |
1446 | ret = -EINVAL; |
1447 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1448 | goto out; |
1da177e4 | 1449 | |
e67b7985 | 1450 | avc_set_cache_threshold(new_value); |
b77a493b | 1451 | |
1da177e4 | 1452 | ret = count; |
1da177e4 | 1453 | out: |
8365a719 | 1454 | kfree(page); |
1da177e4 LT |
1455 | return ret; |
1456 | } | |
1457 | ||
1458 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1459 | size_t count, loff_t *ppos) | |
1460 | { | |
1461 | char *page; | |
b77a493b | 1462 | ssize_t length; |
1da177e4 LT |
1463 | |
1464 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1465 | if (!page) |
1466 | return -ENOMEM; | |
1467 | ||
e67b7985 | 1468 | length = avc_get_hash_stats(page); |
b77a493b EP |
1469 | if (length >= 0) |
1470 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1471 | free_page((unsigned long)page); |
b77a493b EP |
1472 | |
1473 | return length; | |
1da177e4 LT |
1474 | } |
1475 | ||
66f8e2f0 JVS |
1476 | static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf, |
1477 | size_t count, loff_t *ppos) | |
1478 | { | |
66f8e2f0 JVS |
1479 | char *page; |
1480 | ssize_t length; | |
1481 | ||
1482 | page = (char *)__get_free_page(GFP_KERNEL); | |
1483 | if (!page) | |
1484 | return -ENOMEM; | |
1485 | ||
e67b7985 | 1486 | length = security_sidtab_hash_stats(page); |
66f8e2f0 JVS |
1487 | if (length >= 0) |
1488 | length = simple_read_from_buffer(buf, count, ppos, page, | |
1489 | length); | |
1490 | free_page((unsigned long)page); | |
1491 | ||
1492 | return length; | |
1493 | } | |
1494 | ||
1495 | static const struct file_operations sel_sidtab_hash_stats_ops = { | |
1496 | .read = sel_read_sidtab_hash_stats, | |
1497 | .llseek = generic_file_llseek, | |
1498 | }; | |
1499 | ||
9c2e08c5 | 1500 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1501 | .read = sel_read_avc_cache_threshold, |
1502 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1503 | .llseek = generic_file_llseek, |
1da177e4 LT |
1504 | }; |
1505 | ||
9c2e08c5 | 1506 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1507 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1508 | .llseek = generic_file_llseek, |
1da177e4 LT |
1509 | }; |
1510 | ||
1511 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1512 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1513 | { | |
1514 | int cpu; | |
1515 | ||
4f4b6c1a | 1516 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1517 | if (!cpu_possible(cpu)) |
1518 | continue; | |
1519 | *idx = cpu + 1; | |
1520 | return &per_cpu(avc_cache_stats, cpu); | |
1521 | } | |
8d269a8e | 1522 | (*idx)++; |
1da177e4 LT |
1523 | return NULL; |
1524 | } | |
1525 | ||
1526 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1527 | { | |
1528 | loff_t n = *pos - 1; | |
1529 | ||
1530 | if (*pos == 0) | |
1531 | return SEQ_START_TOKEN; | |
1532 | ||
1533 | return sel_avc_get_stat_idx(&n); | |
1534 | } | |
1535 | ||
1536 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1537 | { | |
1538 | return sel_avc_get_stat_idx(pos); | |
1539 | } | |
1540 | ||
1541 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1542 | { | |
1543 | struct avc_cache_stats *st = v; | |
1544 | ||
710a0647 ME |
1545 | if (v == SEQ_START_TOKEN) { |
1546 | seq_puts(seq, | |
1547 | "lookups hits misses allocations reclaims frees\n"); | |
1548 | } else { | |
257313b2 LT |
1549 | unsigned int lookups = st->lookups; |
1550 | unsigned int misses = st->misses; | |
1551 | unsigned int hits = lookups - misses; | |
1552 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1553 | hits, misses, st->allocations, | |
1da177e4 | 1554 | st->reclaims, st->frees); |
257313b2 | 1555 | } |
1da177e4 LT |
1556 | return 0; |
1557 | } | |
1558 | ||
1559 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1560 | { } | |
1561 | ||
1996a109 | 1562 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1563 | .start = sel_avc_stats_seq_start, |
1564 | .next = sel_avc_stats_seq_next, | |
1565 | .show = sel_avc_stats_seq_show, | |
1566 | .stop = sel_avc_stats_seq_stop, | |
1567 | }; | |
1568 | ||
1569 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1570 | { | |
1571 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1572 | } | |
1573 | ||
9c2e08c5 | 1574 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1575 | .open = sel_open_avc_cache_stats, |
1576 | .read = seq_read, | |
1577 | .llseek = seq_lseek, | |
1578 | .release = seq_release, | |
1579 | }; | |
1580 | #endif | |
1581 | ||
1582 | static int sel_make_avc_files(struct dentry *dir) | |
1583 | { | |
0619f0f5 SS |
1584 | struct super_block *sb = dir->d_sb; |
1585 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
97842c56 | 1586 | unsigned int i; |
cda37124 | 1587 | static const struct tree_descr files[] = { |
1da177e4 LT |
1588 | { "cache_threshold", |
1589 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1590 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1591 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1592 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1593 | #endif | |
1594 | }; | |
1595 | ||
6e20a64a | 1596 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1597 | struct inode *inode; |
1598 | struct dentry *dentry; | |
1599 | ||
1600 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1601 | if (!dentry) |
1602 | return -ENOMEM; | |
1da177e4 LT |
1603 | |
1604 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
7e4237fa | 1605 | if (!inode) { |
1606 | dput(dentry); | |
b77a493b | 1607 | return -ENOMEM; |
7e4237fa | 1608 | } |
b77a493b | 1609 | |
1da177e4 | 1610 | inode->i_fop = files[i].ops; |
0619f0f5 | 1611 | inode->i_ino = ++fsi->last_ino; |
1da177e4 LT |
1612 | d_add(dentry, inode); |
1613 | } | |
b77a493b EP |
1614 | |
1615 | return 0; | |
1da177e4 LT |
1616 | } |
1617 | ||
66f8e2f0 JVS |
1618 | static int sel_make_ss_files(struct dentry *dir) |
1619 | { | |
1620 | struct super_block *sb = dir->d_sb; | |
1621 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
97842c56 | 1622 | unsigned int i; |
4158cb60 | 1623 | static const struct tree_descr files[] = { |
66f8e2f0 JVS |
1624 | { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO }, |
1625 | }; | |
1626 | ||
1627 | for (i = 0; i < ARRAY_SIZE(files); i++) { | |
1628 | struct inode *inode; | |
1629 | struct dentry *dentry; | |
1630 | ||
1631 | dentry = d_alloc_name(dir, files[i].name); | |
1632 | if (!dentry) | |
1633 | return -ENOMEM; | |
1634 | ||
1635 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1636 | if (!inode) { | |
1637 | dput(dentry); | |
1638 | return -ENOMEM; | |
1639 | } | |
1640 | ||
1641 | inode->i_fop = files[i].ops; | |
1642 | inode->i_ino = ++fsi->last_ino; | |
1643 | d_add(dentry, inode); | |
1644 | } | |
1645 | ||
1646 | return 0; | |
1647 | } | |
1648 | ||
1872981b | 1649 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1650 | size_t count, loff_t *ppos) |
1651 | { | |
f0ee2e46 JC |
1652 | char *con; |
1653 | u32 sid, len; | |
1654 | ssize_t ret; | |
1655 | ||
496ad9aa | 1656 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
e67b7985 | 1657 | ret = security_sid_to_context(sid, &con, &len); |
b77a493b | 1658 | if (ret) |
f0ee2e46 JC |
1659 | return ret; |
1660 | ||
1661 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1662 | kfree(con); | |
1663 | return ret; | |
1664 | } | |
1665 | ||
1666 | static const struct file_operations sel_initcon_ops = { | |
1667 | .read = sel_read_initcon, | |
57a62c23 | 1668 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1669 | }; |
1670 | ||
1671 | static int sel_make_initcon_files(struct dentry *dir) | |
1672 | { | |
97842c56 | 1673 | unsigned int i; |
f0ee2e46 JC |
1674 | |
1675 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1676 | struct inode *inode; | |
1677 | struct dentry *dentry; | |
e3e0b582 SS |
1678 | const char *s = security_get_initial_sid_context(i); |
1679 | ||
1680 | if (!s) | |
1681 | continue; | |
1682 | dentry = d_alloc_name(dir, s); | |
b77a493b EP |
1683 | if (!dentry) |
1684 | return -ENOMEM; | |
f0ee2e46 JC |
1685 | |
1686 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1687 | if (!inode) { |
1688 | dput(dentry); | |
b77a493b | 1689 | return -ENOMEM; |
7e4237fa | 1690 | } |
b77a493b | 1691 | |
f0ee2e46 JC |
1692 | inode->i_fop = &sel_initcon_ops; |
1693 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1694 | d_add(dentry, inode); | |
1695 | } | |
b77a493b EP |
1696 | |
1697 | return 0; | |
f0ee2e46 JC |
1698 | } |
1699 | ||
e47c8fc5 CP |
1700 | static inline unsigned long sel_class_to_ino(u16 class) |
1701 | { | |
1702 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1703 | } | |
1704 | ||
1705 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1706 | { | |
92ae9e82 | 1707 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1708 | } |
1709 | ||
1710 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1711 | { | |
1712 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1713 | } | |
1714 | ||
1715 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1716 | { | |
1717 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1718 | } | |
1719 | ||
1872981b | 1720 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1721 | size_t count, loff_t *ppos) |
1722 | { | |
496ad9aa | 1723 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1724 | char res[TMPBUFLEN]; |
7e78c875 | 1725 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); |
cc1dad71 | 1726 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1727 | } |
1728 | ||
1729 | static const struct file_operations sel_class_ops = { | |
1730 | .read = sel_read_class, | |
57a62c23 | 1731 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1732 | }; |
1733 | ||
1872981b | 1734 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1735 | size_t count, loff_t *ppos) |
1736 | { | |
496ad9aa | 1737 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1738 | char res[TMPBUFLEN]; |
7e78c875 | 1739 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); |
cc1dad71 | 1740 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1741 | } |
1742 | ||
1743 | static const struct file_operations sel_perm_ops = { | |
1744 | .read = sel_read_perm, | |
57a62c23 | 1745 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1746 | }; |
1747 | ||
3bb56b25 PM |
1748 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1749 | size_t count, loff_t *ppos) | |
1750 | { | |
1751 | int value; | |
1752 | char tmpbuf[TMPBUFLEN]; | |
1753 | ssize_t length; | |
496ad9aa | 1754 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 | 1755 | |
e67b7985 | 1756 | value = security_policycap_supported(i_ino & SEL_INO_MASK); |
3bb56b25 PM |
1757 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); |
1758 | ||
1759 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1760 | } | |
1761 | ||
1762 | static const struct file_operations sel_policycap_ops = { | |
1763 | .read = sel_read_policycap, | |
57a62c23 | 1764 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1765 | }; |
1766 | ||
02a52c5c SS |
1767 | static int sel_make_perm_files(struct selinux_policy *newpolicy, |
1768 | char *objclass, int classvalue, | |
1769 | struct dentry *dir) | |
e47c8fc5 | 1770 | { |
c50e125d CG |
1771 | u32 i, nperms; |
1772 | int rc; | |
e47c8fc5 CP |
1773 | char **perms; |
1774 | ||
02a52c5c | 1775 | rc = security_get_permissions(newpolicy, objclass, &perms, &nperms); |
e47c8fc5 | 1776 | if (rc) |
b77a493b | 1777 | return rc; |
e47c8fc5 CP |
1778 | |
1779 | for (i = 0; i < nperms; i++) { | |
1780 | struct inode *inode; | |
1781 | struct dentry *dentry; | |
1782 | ||
b77a493b | 1783 | rc = -ENOMEM; |
e47c8fc5 | 1784 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1785 | if (!dentry) |
1786 | goto out; | |
e47c8fc5 | 1787 | |
b77a493b | 1788 | rc = -ENOMEM; |
e47c8fc5 | 1789 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
7e4237fa | 1790 | if (!inode) { |
1791 | dput(dentry); | |
b77a493b | 1792 | goto out; |
7e4237fa | 1793 | } |
b77a493b | 1794 | |
e47c8fc5 CP |
1795 | inode->i_fop = &sel_perm_ops; |
1796 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1797 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1798 | d_add(dentry, inode); |
1799 | } | |
b77a493b EP |
1800 | rc = 0; |
1801 | out: | |
e47c8fc5 CP |
1802 | for (i = 0; i < nperms; i++) |
1803 | kfree(perms[i]); | |
1804 | kfree(perms); | |
e47c8fc5 CP |
1805 | return rc; |
1806 | } | |
1807 | ||
02a52c5c SS |
1808 | static int sel_make_class_dir_entries(struct selinux_policy *newpolicy, |
1809 | char *classname, int index, | |
1810 | struct dentry *dir) | |
e47c8fc5 | 1811 | { |
0619f0f5 SS |
1812 | struct super_block *sb = dir->d_sb; |
1813 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
e47c8fc5 CP |
1814 | struct dentry *dentry = NULL; |
1815 | struct inode *inode = NULL; | |
e47c8fc5 CP |
1816 | |
1817 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1818 | if (!dentry) |
1819 | return -ENOMEM; | |
e47c8fc5 CP |
1820 | |
1821 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1822 | if (!inode) { |
1823 | dput(dentry); | |
b77a493b | 1824 | return -ENOMEM; |
7e4237fa | 1825 | } |
e47c8fc5 CP |
1826 | |
1827 | inode->i_fop = &sel_class_ops; | |
1828 | inode->i_ino = sel_class_to_ino(index); | |
1829 | d_add(dentry, inode); | |
1830 | ||
0619f0f5 | 1831 | dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); |
a1c2aa1e AV |
1832 | if (IS_ERR(dentry)) |
1833 | return PTR_ERR(dentry); | |
e47c8fc5 | 1834 | |
5698f081 | 1835 | return sel_make_perm_files(newpolicy, classname, index, dentry); |
e47c8fc5 CP |
1836 | } |
1837 | ||
66ec384a DB |
1838 | static int sel_make_classes(struct selinux_policy *newpolicy, |
1839 | struct dentry *class_dir, | |
1840 | unsigned long *last_class_ino) | |
e47c8fc5 | 1841 | { |
c50e125d CG |
1842 | u32 i, nclasses; |
1843 | int rc; | |
e47c8fc5 CP |
1844 | char **classes; |
1845 | ||
02a52c5c | 1846 | rc = security_get_classes(newpolicy, &classes, &nclasses); |
b77a493b EP |
1847 | if (rc) |
1848 | return rc; | |
e47c8fc5 CP |
1849 | |
1850 | /* +2 since classes are 1-indexed */ | |
66ec384a | 1851 | *last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1852 | |
1853 | for (i = 0; i < nclasses; i++) { | |
1854 | struct dentry *class_name_dir; | |
1855 | ||
66ec384a DB |
1856 | class_name_dir = sel_make_dir(class_dir, classes[i], |
1857 | last_class_ino); | |
a1c2aa1e AV |
1858 | if (IS_ERR(class_name_dir)) { |
1859 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1860 | goto out; |
a1c2aa1e | 1861 | } |
e47c8fc5 CP |
1862 | |
1863 | /* i+1 since class values are 1-indexed */ | |
02a52c5c | 1864 | rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1, |
e47c8fc5 CP |
1865 | class_name_dir); |
1866 | if (rc) | |
b77a493b | 1867 | goto out; |
e47c8fc5 | 1868 | } |
b77a493b EP |
1869 | rc = 0; |
1870 | out: | |
e47c8fc5 CP |
1871 | for (i = 0; i < nclasses; i++) |
1872 | kfree(classes[i]); | |
1873 | kfree(classes); | |
e47c8fc5 CP |
1874 | return rc; |
1875 | } | |
1876 | ||
0619f0f5 | 1877 | static int sel_make_policycap(struct selinux_fs_info *fsi) |
3bb56b25 PM |
1878 | { |
1879 | unsigned int iter; | |
1880 | struct dentry *dentry = NULL; | |
1881 | struct inode *inode = NULL; | |
1882 | ||
cdbec3ed | 1883 | for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) { |
4dc2fce3 | 1884 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
0619f0f5 | 1885 | dentry = d_alloc_name(fsi->policycap_dir, |
4dc2fce3 | 1886 | selinux_policycap_names[iter]); |
3bb56b25 | 1887 | else |
0619f0f5 | 1888 | dentry = d_alloc_name(fsi->policycap_dir, "unknown"); |
3bb56b25 PM |
1889 | |
1890 | if (dentry == NULL) | |
1891 | return -ENOMEM; | |
1892 | ||
0619f0f5 | 1893 | inode = sel_make_inode(fsi->sb, S_IFREG | 0444); |
7e4237fa | 1894 | if (inode == NULL) { |
1895 | dput(dentry); | |
3bb56b25 | 1896 | return -ENOMEM; |
7e4237fa | 1897 | } |
3bb56b25 PM |
1898 | |
1899 | inode->i_fop = &sel_policycap_ops; | |
1900 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1901 | d_add(dentry, inode); | |
1902 | } | |
1903 | ||
1904 | return 0; | |
1905 | } | |
1906 | ||
a1c2aa1e | 1907 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1908 | unsigned long *ino) |
1da177e4 | 1909 | { |
a1c2aa1e | 1910 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1911 | struct inode *inode; |
1912 | ||
a1c2aa1e AV |
1913 | if (!dentry) |
1914 | return ERR_PTR(-ENOMEM); | |
1915 | ||
1916 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1917 | if (!inode) { | |
1918 | dput(dentry); | |
1919 | return ERR_PTR(-ENOMEM); | |
1920 | } | |
b77a493b | 1921 | |
1da177e4 LT |
1922 | inode->i_op = &simple_dir_inode_operations; |
1923 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1924 | inode->i_ino = ++(*ino); |
40e906f8 | 1925 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1926 | inc_nlink(inode); |
1da177e4 | 1927 | d_add(dentry, inode); |
edb20fb5 | 1928 | /* bump link count on parent directory, too */ |
ce0b16dd | 1929 | inc_nlink(d_inode(dir)); |
b77a493b | 1930 | |
a1c2aa1e | 1931 | return dentry; |
1da177e4 LT |
1932 | } |
1933 | ||
4a0b33f7 AV |
1934 | static int reject_all(struct mnt_idmap *idmap, struct inode *inode, int mask) |
1935 | { | |
1936 | return -EPERM; // no access for anyone, root or no root. | |
1937 | } | |
1938 | ||
1939 | static const struct inode_operations swapover_dir_inode_operations = { | |
1940 | .lookup = simple_lookup, | |
1941 | .permission = reject_all, | |
1942 | }; | |
1943 | ||
1944 | static struct dentry *sel_make_swapover_dir(struct super_block *sb, | |
0eea6091 DB |
1945 | unsigned long *ino) |
1946 | { | |
4a0b33f7 AV |
1947 | struct dentry *dentry = d_alloc_name(sb->s_root, ".swapover"); |
1948 | struct inode *inode; | |
0eea6091 | 1949 | |
4a0b33f7 | 1950 | if (!dentry) |
0eea6091 DB |
1951 | return ERR_PTR(-ENOMEM); |
1952 | ||
4a0b33f7 AV |
1953 | inode = sel_make_inode(sb, S_IFDIR); |
1954 | if (!inode) { | |
1955 | dput(dentry); | |
1956 | return ERR_PTR(-ENOMEM); | |
1957 | } | |
1958 | ||
1959 | inode->i_op = &swapover_dir_inode_operations; | |
0eea6091 DB |
1960 | inode->i_ino = ++(*ino); |
1961 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
1962 | inc_nlink(inode); | |
4a0b33f7 AV |
1963 | inode_lock(sb->s_root->d_inode); |
1964 | d_add(dentry, inode); | |
1965 | inc_nlink(sb->s_root->d_inode); | |
1966 | inode_unlock(sb->s_root->d_inode); | |
1967 | return dentry; | |
0eea6091 DB |
1968 | } |
1969 | ||
0619f0f5 SS |
1970 | #define NULL_FILE_NAME "null" |
1971 | ||
920f50b2 | 1972 | static int sel_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 1973 | { |
0619f0f5 | 1974 | struct selinux_fs_info *fsi; |
1da177e4 LT |
1975 | int ret; |
1976 | struct dentry *dentry; | |
a1c2aa1e | 1977 | struct inode *inode; |
1da177e4 LT |
1978 | struct inode_security_struct *isec; |
1979 | ||
cda37124 | 1980 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
1981 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
1982 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1983 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1984 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1985 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1986 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1987 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1988 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1989 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1990 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1991 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1992 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1993 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1994 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1995 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1996 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1997 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1998 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1999 | S_IWUGO}, | |
1da177e4 LT |
2000 | /* last one */ {""} |
2001 | }; | |
0619f0f5 SS |
2002 | |
2003 | ret = selinux_fs_info_create(sb); | |
2004 | if (ret) | |
2005 | goto err; | |
2006 | ||
1da177e4 LT |
2007 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
2008 | if (ret) | |
161ce45a | 2009 | goto err; |
1da177e4 | 2010 | |
0619f0f5 SS |
2011 | fsi = sb->s_fs_info; |
2012 | fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); | |
2013 | if (IS_ERR(fsi->bool_dir)) { | |
2014 | ret = PTR_ERR(fsi->bool_dir); | |
2015 | fsi->bool_dir = NULL; | |
161ce45a | 2016 | goto err; |
a1c2aa1e | 2017 | } |
1da177e4 | 2018 | |
b77a493b | 2019 | ret = -ENOMEM; |
1da177e4 | 2020 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 2021 | if (!dentry) |
161ce45a | 2022 | goto err; |
1da177e4 | 2023 | |
b77a493b | 2024 | ret = -ENOMEM; |
1da177e4 | 2025 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
7e4237fa | 2026 | if (!inode) { |
2027 | dput(dentry); | |
161ce45a | 2028 | goto err; |
7e4237fa | 2029 | } |
b77a493b | 2030 | |
0619f0f5 | 2031 | inode->i_ino = ++fsi->last_ino; |
80788c22 | 2032 | isec = selinux_inode(inode); |
1da177e4 LT |
2033 | isec->sid = SECINITSID_DEVNULL; |
2034 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 2035 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
2036 | |
2037 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
2038 | d_add(dentry, inode); | |
1da177e4 | 2039 | |
0619f0f5 | 2040 | dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); |
a1c2aa1e AV |
2041 | if (IS_ERR(dentry)) { |
2042 | ret = PTR_ERR(dentry); | |
161ce45a | 2043 | goto err; |
a1c2aa1e | 2044 | } |
1da177e4 LT |
2045 | |
2046 | ret = sel_make_avc_files(dentry); | |
bcb62828 CG |
2047 | if (ret) |
2048 | goto err; | |
66f8e2f0 JVS |
2049 | |
2050 | dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino); | |
2051 | if (IS_ERR(dentry)) { | |
2052 | ret = PTR_ERR(dentry); | |
2053 | goto err; | |
2054 | } | |
2055 | ||
2056 | ret = sel_make_ss_files(dentry); | |
1da177e4 | 2057 | if (ret) |
161ce45a | 2058 | goto err; |
f0ee2e46 | 2059 | |
0619f0f5 | 2060 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); |
a1c2aa1e AV |
2061 | if (IS_ERR(dentry)) { |
2062 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 2063 | goto err; |
a1c2aa1e | 2064 | } |
f0ee2e46 JC |
2065 | |
2066 | ret = sel_make_initcon_files(dentry); | |
2067 | if (ret) | |
2068 | goto err; | |
2069 | ||
613ba187 | 2070 | fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino); |
0619f0f5 SS |
2071 | if (IS_ERR(fsi->class_dir)) { |
2072 | ret = PTR_ERR(fsi->class_dir); | |
2073 | fsi->class_dir = NULL; | |
3bb56b25 | 2074 | goto err; |
a1c2aa1e | 2075 | } |
3bb56b25 | 2076 | |
613ba187 | 2077 | fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME, |
0619f0f5 SS |
2078 | &fsi->last_ino); |
2079 | if (IS_ERR(fsi->policycap_dir)) { | |
2080 | ret = PTR_ERR(fsi->policycap_dir); | |
2081 | fsi->policycap_dir = NULL; | |
3bb56b25 | 2082 | goto err; |
a1c2aa1e | 2083 | } |
0619f0f5 | 2084 | |
02a52c5c SS |
2085 | ret = sel_make_policycap(fsi); |
2086 | if (ret) { | |
2087 | pr_err("SELinux: failed to load policy capabilities\n"); | |
0619f0f5 | 2088 | goto err; |
02a52c5c SS |
2089 | } |
2090 | ||
b77a493b | 2091 | return 0; |
161ce45a | 2092 | err: |
f8b69a5f | 2093 | pr_err("SELinux: %s: failed while creating inodes\n", |
744ba35e | 2094 | __func__); |
0619f0f5 SS |
2095 | |
2096 | selinux_fs_info_free(sb); | |
2097 | ||
b77a493b | 2098 | return ret; |
1da177e4 LT |
2099 | } |
2100 | ||
920f50b2 | 2101 | static int sel_get_tree(struct fs_context *fc) |
1da177e4 | 2102 | { |
920f50b2 DH |
2103 | return get_tree_single(fc, sel_fill_super); |
2104 | } | |
2105 | ||
2106 | static const struct fs_context_operations sel_context_ops = { | |
2107 | .get_tree = sel_get_tree, | |
2108 | }; | |
2109 | ||
2110 | static int sel_init_fs_context(struct fs_context *fc) | |
2111 | { | |
2112 | fc->ops = &sel_context_ops; | |
2113 | return 0; | |
1da177e4 LT |
2114 | } |
2115 | ||
0619f0f5 SS |
2116 | static void sel_kill_sb(struct super_block *sb) |
2117 | { | |
2118 | selinux_fs_info_free(sb); | |
2119 | kill_litter_super(sb); | |
2120 | } | |
2121 | ||
1da177e4 LT |
2122 | static struct file_system_type sel_fs_type = { |
2123 | .name = "selinuxfs", | |
920f50b2 | 2124 | .init_fs_context = sel_init_fs_context, |
0619f0f5 | 2125 | .kill_sb = sel_kill_sb, |
1da177e4 LT |
2126 | }; |
2127 | ||
cd2bb4cb | 2128 | struct path selinux_null __ro_after_init; |
1da177e4 LT |
2129 | |
2130 | static int __init init_sel_fs(void) | |
2131 | { | |
0619f0f5 SS |
2132 | struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, |
2133 | sizeof(NULL_FILE_NAME)-1); | |
1da177e4 LT |
2134 | int err; |
2135 | ||
6c5a682e | 2136 | if (!selinux_enabled_boot) |
1da177e4 | 2137 | return 0; |
7a627e3b | 2138 | |
f9bb4882 EB |
2139 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
2140 | if (err) | |
2141 | return err; | |
7a627e3b | 2142 | |
1da177e4 | 2143 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 2144 | if (err) { |
f9bb4882 | 2145 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 2146 | return err; |
7a627e3b | 2147 | } |
b77a493b | 2148 | |
37801a36 CG |
2149 | selinux_null.mnt = kern_mount(&sel_fs_type); |
2150 | if (IS_ERR(selinux_null.mnt)) { | |
f8b69a5f | 2151 | pr_err("selinuxfs: could not mount!\n"); |
37801a36 CG |
2152 | err = PTR_ERR(selinux_null.mnt); |
2153 | selinux_null.mnt = NULL; | |
2154 | return err; | |
1da177e4 | 2155 | } |
37801a36 | 2156 | |
0619f0f5 SS |
2157 | selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, |
2158 | &null_name); | |
2159 | if (IS_ERR(selinux_null.dentry)) { | |
2160 | pr_err("selinuxfs: could not lookup null!\n"); | |
2161 | err = PTR_ERR(selinux_null.dentry); | |
2162 | selinux_null.dentry = NULL; | |
37801a36 | 2163 | return err; |
0619f0f5 | 2164 | } |
b77a493b | 2165 | |
fc983171 CG |
2166 | /* |
2167 | * Try to pre-allocate the status page, so the sequence number of the | |
2168 | * initial policy load can be stored. | |
2169 | */ | |
2170 | (void) selinux_kernel_status_page(); | |
2171 | ||
1da177e4 LT |
2172 | return err; |
2173 | } | |
2174 | ||
2175 | __initcall(init_sel_fs); |