Commit | Line | Data |
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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> | |
0619f0f5 | 20 | #include <linux/mount.h> |
bb003079 | 21 | #include <linux/mutex.h> |
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/string.h> | |
24 | #include <linux/security.h> | |
25 | #include <linux/major.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/percpu.h> | |
af601e46 | 28 | #include <linux/audit.h> |
f5269710 | 29 | #include <linux/uaccess.h> |
7a627e3b | 30 | #include <linux/kobject.h> |
0f7e4c33 | 31 | #include <linux/ctype.h> |
1da177e4 LT |
32 | |
33 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
34 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
35 | ||
36 | #include "flask.h" | |
37 | #include "avc.h" | |
38 | #include "avc_ss.h" | |
39 | #include "security.h" | |
40 | #include "objsec.h" | |
41 | #include "conditional.h" | |
42 | ||
1da177e4 LT |
43 | enum sel_inos { |
44 | SEL_ROOT_INO = 2, | |
45 | SEL_LOAD, /* load policy */ | |
46 | SEL_ENFORCE, /* get or set enforcing status */ | |
47 | SEL_CONTEXT, /* validate context */ | |
48 | SEL_ACCESS, /* compute access decision */ | |
49 | SEL_CREATE, /* compute create labeling decision */ | |
50 | SEL_RELABEL, /* compute relabeling decision */ | |
51 | SEL_USER, /* compute reachable user contexts */ | |
52 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
53 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
54 | SEL_MLS, /* return if MLS policy is enabled */ | |
55 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
56 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
57 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 58 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
59 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
60 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 61 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 62 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 63 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 64 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
65 | }; |
66 | ||
0619f0f5 SS |
67 | struct selinux_fs_info { |
68 | struct dentry *bool_dir; | |
69 | unsigned int bool_num; | |
70 | char **bool_pending_names; | |
71 | unsigned int *bool_pending_values; | |
72 | struct dentry *class_dir; | |
73 | unsigned long last_class_ino; | |
74 | bool policy_opened; | |
75 | struct dentry *policycap_dir; | |
76 | struct mutex mutex; | |
77 | unsigned long last_ino; | |
78 | struct selinux_state *state; | |
79 | struct super_block *sb; | |
80 | }; | |
81 | ||
82 | static int selinux_fs_info_create(struct super_block *sb) | |
83 | { | |
84 | struct selinux_fs_info *fsi; | |
85 | ||
86 | fsi = kzalloc(sizeof(*fsi), GFP_KERNEL); | |
87 | if (!fsi) | |
88 | return -ENOMEM; | |
89 | ||
90 | mutex_init(&fsi->mutex); | |
91 | fsi->last_ino = SEL_INO_NEXT - 1; | |
92 | fsi->state = &selinux_state; | |
93 | fsi->sb = sb; | |
94 | sb->s_fs_info = fsi; | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static void selinux_fs_info_free(struct super_block *sb) | |
99 | { | |
100 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
101 | int i; | |
102 | ||
103 | if (fsi) { | |
104 | for (i = 0; i < fsi->bool_num; i++) | |
105 | kfree(fsi->bool_pending_names[i]); | |
106 | kfree(fsi->bool_pending_names); | |
107 | kfree(fsi->bool_pending_values); | |
108 | } | |
109 | kfree(sb->s_fs_info); | |
110 | sb->s_fs_info = NULL; | |
111 | } | |
6174eafc | 112 | |
3bb56b25 PM |
113 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
114 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
115 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
116 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
117 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 118 | |
1da177e4 LT |
119 | #define TMPBUFLEN 12 |
120 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
121 | size_t count, loff_t *ppos) | |
122 | { | |
0619f0f5 | 123 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
124 | char tmpbuf[TMPBUFLEN]; |
125 | ssize_t length; | |
126 | ||
aa8e712c | 127 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 128 | enforcing_enabled(fsi->state)); |
1da177e4 LT |
129 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
130 | } | |
131 | ||
132 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 133 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
134 | size_t count, loff_t *ppos) |
135 | ||
136 | { | |
0619f0f5 SS |
137 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
138 | struct selinux_state *state = fsi->state; | |
b77a493b | 139 | char *page = NULL; |
1da177e4 | 140 | ssize_t length; |
aa8e712c | 141 | int old_value, new_value; |
1da177e4 | 142 | |
bfd51626 | 143 | if (count >= PAGE_SIZE) |
8365a719 | 144 | return -ENOMEM; |
b77a493b EP |
145 | |
146 | /* No partial writes. */ | |
b77a493b | 147 | if (*ppos != 0) |
8365a719 | 148 | return -EINVAL; |
b77a493b | 149 | |
8365a719 AV |
150 | page = memdup_user_nul(buf, count); |
151 | if (IS_ERR(page)) | |
152 | return PTR_ERR(page); | |
1da177e4 LT |
153 | |
154 | length = -EINVAL; | |
155 | if (sscanf(page, "%d", &new_value) != 1) | |
156 | goto out; | |
157 | ||
ea49d10e SS |
158 | new_value = !!new_value; |
159 | ||
0619f0f5 | 160 | old_value = enforcing_enabled(state); |
aa8e712c | 161 | if (new_value != old_value) { |
6b6bc620 SS |
162 | length = avc_has_perm(&selinux_state, |
163 | 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 RGB |
169 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
170 | " enabled=%d old-enabled=%d lsm=selinux res=1", | |
aa8e712c | 171 | new_value, old_value, |
581abc09 | 172 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4195ed42 RGB |
173 | audit_get_sessionid(current), |
174 | selinux_enabled, selinux_enabled); | |
0619f0f5 | 175 | enforcing_set(state, new_value); |
aa8e712c | 176 | if (new_value) |
6b6bc620 | 177 | avc_ss_reset(state->avc, 0); |
aa8e712c | 178 | selnl_notify_setenforce(new_value); |
0619f0f5 | 179 | selinux_status_update_setenforce(state, new_value); |
aa8e712c | 180 | if (!new_value) |
8f408ab6 | 181 | call_lsm_notifier(LSM_POLICY_CHANGE, NULL); |
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 | { | |
0619f0f5 SS |
201 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
202 | struct selinux_state *state = fsi->state; | |
3f12070e EP |
203 | char tmpbuf[TMPBUFLEN]; |
204 | ssize_t length; | |
496ad9aa | 205 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e | 206 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
0619f0f5 SS |
207 | security_get_reject_unknown(state) : |
208 | !security_get_allow_unknown(state); | |
3f12070e EP |
209 | |
210 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
211 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
212 | } | |
213 | ||
214 | static const struct file_operations sel_handle_unknown_ops = { | |
215 | .read = sel_read_handle_unknown, | |
57a62c23 | 216 | .llseek = generic_file_llseek, |
3f12070e EP |
217 | }; |
218 | ||
11904167 KK |
219 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
220 | { | |
0619f0f5 SS |
221 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
222 | struct page *status = selinux_kernel_status_page(fsi->state); | |
11904167 KK |
223 | |
224 | if (!status) | |
225 | return -ENOMEM; | |
226 | ||
227 | filp->private_data = status; | |
228 | ||
229 | return 0; | |
230 | } | |
231 | ||
232 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
233 | size_t count, loff_t *ppos) | |
234 | { | |
235 | struct page *status = filp->private_data; | |
236 | ||
237 | BUG_ON(!status); | |
238 | ||
239 | return simple_read_from_buffer(buf, count, ppos, | |
240 | page_address(status), | |
241 | sizeof(struct selinux_kernel_status)); | |
242 | } | |
243 | ||
244 | static int sel_mmap_handle_status(struct file *filp, | |
245 | struct vm_area_struct *vma) | |
246 | { | |
247 | struct page *status = filp->private_data; | |
248 | unsigned long size = vma->vm_end - vma->vm_start; | |
249 | ||
250 | BUG_ON(!status); | |
251 | ||
252 | /* only allows one page from the head */ | |
253 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
254 | return -EIO; | |
255 | /* disallow writable mapping */ | |
256 | if (vma->vm_flags & VM_WRITE) | |
257 | return -EPERM; | |
258 | /* disallow mprotect() turns it into writable */ | |
259 | vma->vm_flags &= ~VM_MAYWRITE; | |
260 | ||
261 | return remap_pfn_range(vma, vma->vm_start, | |
262 | page_to_pfn(status), | |
263 | size, vma->vm_page_prot); | |
264 | } | |
265 | ||
266 | static const struct file_operations sel_handle_status_ops = { | |
267 | .open = sel_open_handle_status, | |
268 | .read = sel_read_handle_status, | |
269 | .mmap = sel_mmap_handle_status, | |
270 | .llseek = generic_file_llseek, | |
271 | }; | |
272 | ||
1da177e4 | 273 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 274 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
275 | size_t count, loff_t *ppos) |
276 | ||
277 | { | |
0619f0f5 | 278 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 279 | char *page; |
1da177e4 LT |
280 | ssize_t length; |
281 | int new_value; | |
4195ed42 | 282 | int enforcing; |
1da177e4 | 283 | |
bfd51626 | 284 | if (count >= PAGE_SIZE) |
8365a719 | 285 | return -ENOMEM; |
b77a493b EP |
286 | |
287 | /* No partial writes. */ | |
b77a493b | 288 | if (*ppos != 0) |
8365a719 | 289 | return -EINVAL; |
b77a493b | 290 | |
8365a719 AV |
291 | page = memdup_user_nul(buf, count); |
292 | if (IS_ERR(page)) | |
293 | return PTR_ERR(page); | |
1da177e4 LT |
294 | |
295 | length = -EINVAL; | |
296 | if (sscanf(page, "%d", &new_value) != 1) | |
297 | goto out; | |
298 | ||
299 | if (new_value) { | |
4195ed42 | 300 | enforcing = enforcing_enabled(fsi->state); |
0619f0f5 | 301 | length = selinux_disable(fsi->state); |
b77a493b | 302 | if (length) |
1da177e4 | 303 | goto out; |
cdfb6b34 | 304 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 RGB |
305 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
306 | " enabled=%d old-enabled=%d lsm=selinux res=1", | |
307 | enforcing, enforcing, | |
581abc09 | 308 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4195ed42 | 309 | audit_get_sessionid(current), 0, 1); |
1da177e4 LT |
310 | } |
311 | ||
312 | length = count; | |
313 | out: | |
8365a719 | 314 | kfree(page); |
1da177e4 LT |
315 | return length; |
316 | } | |
317 | #else | |
318 | #define sel_write_disable NULL | |
319 | #endif | |
320 | ||
9c2e08c5 | 321 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 322 | .write = sel_write_disable, |
57a62c23 | 323 | .llseek = generic_file_llseek, |
1da177e4 LT |
324 | }; |
325 | ||
326 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 327 | size_t count, loff_t *ppos) |
1da177e4 LT |
328 | { |
329 | char tmpbuf[TMPBUFLEN]; | |
330 | ssize_t length; | |
331 | ||
332 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
333 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
334 | } | |
335 | ||
9c2e08c5 | 336 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 337 | .read = sel_read_policyvers, |
57a62c23 | 338 | .llseek = generic_file_llseek, |
1da177e4 LT |
339 | }; |
340 | ||
341 | /* declaration for sel_write_load */ | |
0619f0f5 SS |
342 | static int sel_make_bools(struct selinux_fs_info *fsi); |
343 | static int sel_make_classes(struct selinux_fs_info *fsi); | |
344 | static int sel_make_policycap(struct selinux_fs_info *fsi); | |
e47c8fc5 CP |
345 | |
346 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 347 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 348 | unsigned long *ino); |
1da177e4 LT |
349 | |
350 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
351 | size_t count, loff_t *ppos) | |
352 | { | |
0619f0f5 | 353 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
354 | char tmpbuf[TMPBUFLEN]; |
355 | ssize_t length; | |
356 | ||
0719aaf5 | 357 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 358 | security_mls_enabled(fsi->state)); |
1da177e4 LT |
359 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
360 | } | |
361 | ||
9c2e08c5 | 362 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 363 | .read = sel_read_mls, |
57a62c23 | 364 | .llseek = generic_file_llseek, |
1da177e4 LT |
365 | }; |
366 | ||
cee74f47 EP |
367 | struct policy_load_memory { |
368 | size_t len; | |
369 | void *data; | |
370 | }; | |
371 | ||
372 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
373 | { | |
0619f0f5 SS |
374 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
375 | struct selinux_state *state = fsi->state; | |
cee74f47 EP |
376 | struct policy_load_memory *plm = NULL; |
377 | int rc; | |
378 | ||
379 | BUG_ON(filp->private_data); | |
380 | ||
0619f0f5 | 381 | mutex_lock(&fsi->mutex); |
cee74f47 | 382 | |
6b6bc620 SS |
383 | rc = avc_has_perm(&selinux_state, |
384 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 385 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 EP |
386 | if (rc) |
387 | goto err; | |
388 | ||
389 | rc = -EBUSY; | |
0619f0f5 | 390 | if (fsi->policy_opened) |
cee74f47 EP |
391 | goto err; |
392 | ||
393 | rc = -ENOMEM; | |
394 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
395 | if (!plm) | |
396 | goto err; | |
397 | ||
0619f0f5 | 398 | if (i_size_read(inode) != security_policydb_len(state)) { |
5955102c | 399 | inode_lock(inode); |
0619f0f5 | 400 | i_size_write(inode, security_policydb_len(state)); |
5955102c | 401 | inode_unlock(inode); |
cee74f47 EP |
402 | } |
403 | ||
0619f0f5 | 404 | rc = security_read_policy(state, &plm->data, &plm->len); |
cee74f47 EP |
405 | if (rc) |
406 | goto err; | |
407 | ||
0619f0f5 | 408 | fsi->policy_opened = 1; |
cee74f47 EP |
409 | |
410 | filp->private_data = plm; | |
411 | ||
0619f0f5 | 412 | mutex_unlock(&fsi->mutex); |
cee74f47 EP |
413 | |
414 | return 0; | |
415 | err: | |
0619f0f5 | 416 | mutex_unlock(&fsi->mutex); |
cee74f47 EP |
417 | |
418 | if (plm) | |
419 | vfree(plm->data); | |
420 | kfree(plm); | |
421 | return rc; | |
422 | } | |
423 | ||
424 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
425 | { | |
0619f0f5 | 426 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
427 | struct policy_load_memory *plm = filp->private_data; |
428 | ||
429 | BUG_ON(!plm); | |
430 | ||
0619f0f5 | 431 | fsi->policy_opened = 0; |
cee74f47 EP |
432 | |
433 | vfree(plm->data); | |
434 | kfree(plm); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
440 | size_t count, loff_t *ppos) | |
441 | { | |
442 | struct policy_load_memory *plm = filp->private_data; | |
443 | int ret; | |
444 | ||
6b6bc620 SS |
445 | ret = avc_has_perm(&selinux_state, |
446 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 447 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 | 448 | if (ret) |
0da74120 | 449 | return ret; |
cee74f47 | 450 | |
0da74120 | 451 | return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); |
cee74f47 EP |
452 | } |
453 | ||
ac9a1f6d | 454 | static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 455 | { |
11bac800 | 456 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
457 | unsigned long offset; |
458 | struct page *page; | |
459 | ||
460 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
461 | return VM_FAULT_SIGBUS; | |
462 | ||
463 | offset = vmf->pgoff << PAGE_SHIFT; | |
464 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
465 | return VM_FAULT_SIGBUS; | |
466 | ||
467 | page = vmalloc_to_page(plm->data + offset); | |
468 | get_page(page); | |
469 | ||
470 | vmf->page = page; | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
7cbea8dc | 475 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
476 | .fault = sel_mmap_policy_fault, |
477 | .page_mkwrite = sel_mmap_policy_fault, | |
478 | }; | |
479 | ||
ad3fa08c | 480 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
481 | { |
482 | if (vma->vm_flags & VM_SHARED) { | |
483 | /* do not allow mprotect to make mapping writable */ | |
484 | vma->vm_flags &= ~VM_MAYWRITE; | |
485 | ||
486 | if (vma->vm_flags & VM_WRITE) | |
487 | return -EACCES; | |
488 | } | |
489 | ||
314e51b9 | 490 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
491 | vma->vm_ops = &sel_mmap_policy_ops; |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
cee74f47 EP |
496 | static const struct file_operations sel_policy_ops = { |
497 | .open = sel_open_policy, | |
498 | .read = sel_read_policy, | |
845ca30f | 499 | .mmap = sel_mmap_policy, |
cee74f47 | 500 | .release = sel_release_policy, |
47a93a5b | 501 | .llseek = generic_file_llseek, |
cee74f47 EP |
502 | }; |
503 | ||
0619f0f5 SS |
504 | static int sel_make_policy_nodes(struct selinux_fs_info *fsi) |
505 | { | |
506 | int ret; | |
507 | ||
508 | ret = sel_make_bools(fsi); | |
509 | if (ret) { | |
510 | pr_err("SELinux: failed to load policy booleans\n"); | |
511 | return ret; | |
512 | } | |
513 | ||
514 | ret = sel_make_classes(fsi); | |
515 | if (ret) { | |
516 | pr_err("SELinux: failed to load policy classes\n"); | |
517 | return ret; | |
518 | } | |
519 | ||
520 | ret = sel_make_policycap(fsi); | |
521 | if (ret) { | |
522 | pr_err("SELinux: failed to load policy capabilities\n"); | |
523 | return ret; | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
1872981b | 529 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
530 | size_t count, loff_t *ppos) |
531 | ||
532 | { | |
0619f0f5 | 533 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1da177e4 LT |
534 | ssize_t length; |
535 | void *data = NULL; | |
536 | ||
0619f0f5 | 537 | mutex_lock(&fsi->mutex); |
1da177e4 | 538 | |
6b6bc620 SS |
539 | length = avc_has_perm(&selinux_state, |
540 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 541 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); |
1da177e4 LT |
542 | if (length) |
543 | goto out; | |
544 | ||
b77a493b EP |
545 | /* No partial writes. */ |
546 | length = -EINVAL; | |
547 | if (*ppos != 0) | |
1da177e4 | 548 | goto out; |
1da177e4 | 549 | |
b77a493b EP |
550 | length = -EFBIG; |
551 | if (count > 64 * 1024 * 1024) | |
552 | goto out; | |
553 | ||
554 | length = -ENOMEM; | |
555 | data = vmalloc(count); | |
556 | if (!data) | |
1da177e4 | 557 | goto out; |
1da177e4 LT |
558 | |
559 | length = -EFAULT; | |
560 | if (copy_from_user(data, buf, count) != 0) | |
561 | goto out; | |
562 | ||
0619f0f5 | 563 | length = security_load_policy(fsi->state, data, count); |
4262fb51 GT |
564 | if (length) { |
565 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 566 | goto out; |
4262fb51 | 567 | } |
1da177e4 | 568 | |
0619f0f5 SS |
569 | length = sel_make_policy_nodes(fsi); |
570 | if (length) | |
b77a493b EP |
571 | goto out1; |
572 | ||
573 | length = count; | |
e47c8fc5 CP |
574 | |
575 | out1: | |
cdfb6b34 | 576 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
d141136f | 577 | "auid=%u ses=%u lsm=selinux res=1", |
581abc09 | 578 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 579 | audit_get_sessionid(current)); |
1da177e4 | 580 | out: |
0619f0f5 | 581 | mutex_unlock(&fsi->mutex); |
1da177e4 LT |
582 | vfree(data); |
583 | return length; | |
584 | } | |
585 | ||
9c2e08c5 | 586 | static const struct file_operations sel_load_ops = { |
1da177e4 | 587 | .write = sel_write_load, |
57a62c23 | 588 | .llseek = generic_file_llseek, |
1da177e4 LT |
589 | }; |
590 | ||
1872981b | 591 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 592 | { |
0619f0f5 SS |
593 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
594 | struct selinux_state *state = fsi->state; | |
b77a493b | 595 | char *canon = NULL; |
ce9982d0 | 596 | u32 sid, len; |
1da177e4 LT |
597 | ssize_t length; |
598 | ||
6b6bc620 SS |
599 | length = avc_has_perm(&selinux_state, |
600 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 601 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); |
1da177e4 | 602 | if (length) |
b77a493b | 603 | goto out; |
1da177e4 | 604 | |
0619f0f5 | 605 | length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
606 | if (length) |
607 | goto out; | |
1da177e4 | 608 | |
0619f0f5 | 609 | length = security_sid_to_context(state, sid, &canon, &len); |
b77a493b EP |
610 | if (length) |
611 | goto out; | |
ce9982d0 | 612 | |
b77a493b | 613 | length = -ERANGE; |
ce9982d0 | 614 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 615 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 616 | "payload max\n", __func__, len); |
1da177e4 | 617 | goto out; |
ce9982d0 | 618 | } |
1da177e4 | 619 | |
ce9982d0 SS |
620 | memcpy(buf, canon, len); |
621 | length = len; | |
1da177e4 | 622 | out: |
ce9982d0 | 623 | kfree(canon); |
1da177e4 LT |
624 | return length; |
625 | } | |
626 | ||
1da177e4 LT |
627 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
628 | size_t count, loff_t *ppos) | |
629 | { | |
0619f0f5 | 630 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
631 | char tmpbuf[TMPBUFLEN]; |
632 | ssize_t length; | |
633 | ||
0619f0f5 | 634 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot); |
1da177e4 LT |
635 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
636 | } | |
637 | ||
1872981b | 638 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
639 | size_t count, loff_t *ppos) |
640 | { | |
0619f0f5 | 641 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 642 | char *page; |
1da177e4 LT |
643 | ssize_t length; |
644 | unsigned int new_value; | |
645 | ||
6b6bc620 SS |
646 | length = avc_has_perm(&selinux_state, |
647 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
648 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, |
649 | NULL); | |
1da177e4 | 650 | if (length) |
8365a719 | 651 | return length; |
1da177e4 | 652 | |
bfd51626 | 653 | if (count >= PAGE_SIZE) |
8365a719 | 654 | return -ENOMEM; |
b77a493b EP |
655 | |
656 | /* No partial writes. */ | |
b77a493b | 657 | if (*ppos != 0) |
8365a719 | 658 | return -EINVAL; |
b77a493b | 659 | |
8365a719 AV |
660 | page = memdup_user_nul(buf, count); |
661 | if (IS_ERR(page)) | |
662 | return PTR_ERR(page); | |
1da177e4 LT |
663 | |
664 | length = -EINVAL; | |
665 | if (sscanf(page, "%u", &new_value) != 1) | |
666 | goto out; | |
667 | ||
0619f0f5 | 668 | fsi->state->checkreqprot = new_value ? 1 : 0; |
1da177e4 LT |
669 | length = count; |
670 | out: | |
8365a719 | 671 | kfree(page); |
1da177e4 LT |
672 | return length; |
673 | } | |
9c2e08c5 | 674 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
675 | .read = sel_read_checkreqprot, |
676 | .write = sel_write_checkreqprot, | |
57a62c23 | 677 | .llseek = generic_file_llseek, |
1da177e4 LT |
678 | }; |
679 | ||
f9df6458 AP |
680 | static ssize_t sel_write_validatetrans(struct file *file, |
681 | const char __user *buf, | |
682 | size_t count, loff_t *ppos) | |
683 | { | |
0619f0f5 SS |
684 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
685 | struct selinux_state *state = fsi->state; | |
f9df6458 AP |
686 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; |
687 | char *req = NULL; | |
688 | u32 osid, nsid, tsid; | |
689 | u16 tclass; | |
690 | int rc; | |
691 | ||
6b6bc620 SS |
692 | rc = avc_has_perm(&selinux_state, |
693 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 694 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); |
f9df6458 AP |
695 | if (rc) |
696 | goto out; | |
697 | ||
698 | rc = -ENOMEM; | |
699 | if (count >= PAGE_SIZE) | |
700 | goto out; | |
701 | ||
702 | /* No partial writes. */ | |
703 | rc = -EINVAL; | |
704 | if (*ppos != 0) | |
705 | goto out; | |
706 | ||
0b884d25 AV |
707 | req = memdup_user_nul(buf, count); |
708 | if (IS_ERR(req)) { | |
709 | rc = PTR_ERR(req); | |
710 | req = NULL; | |
f9df6458 | 711 | goto out; |
0b884d25 | 712 | } |
f9df6458 AP |
713 | |
714 | rc = -ENOMEM; | |
715 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
716 | if (!oldcon) | |
717 | goto out; | |
718 | ||
719 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
720 | if (!newcon) | |
721 | goto out; | |
722 | ||
723 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
724 | if (!taskcon) | |
725 | goto out; | |
726 | ||
727 | rc = -EINVAL; | |
728 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
729 | goto out; | |
730 | ||
0619f0f5 | 731 | rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL); |
f9df6458 AP |
732 | if (rc) |
733 | goto out; | |
734 | ||
0619f0f5 | 735 | rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL); |
f9df6458 AP |
736 | if (rc) |
737 | goto out; | |
738 | ||
0619f0f5 | 739 | rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL); |
f9df6458 AP |
740 | if (rc) |
741 | goto out; | |
742 | ||
0619f0f5 | 743 | rc = security_validate_transition_user(state, osid, nsid, tsid, tclass); |
f9df6458 AP |
744 | if (!rc) |
745 | rc = count; | |
746 | out: | |
747 | kfree(req); | |
748 | kfree(oldcon); | |
749 | kfree(newcon); | |
750 | kfree(taskcon); | |
751 | return rc; | |
752 | } | |
753 | ||
754 | static const struct file_operations sel_transition_ops = { | |
755 | .write = sel_write_validatetrans, | |
756 | .llseek = generic_file_llseek, | |
757 | }; | |
758 | ||
1da177e4 LT |
759 | /* |
760 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
761 | */ | |
1872981b EP |
762 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
763 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
764 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
765 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
766 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 | 767 | |
631d2b49 | 768 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
1da177e4 LT |
769 | [SEL_ACCESS] = sel_write_access, |
770 | [SEL_CREATE] = sel_write_create, | |
771 | [SEL_RELABEL] = sel_write_relabel, | |
772 | [SEL_USER] = sel_write_user, | |
773 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 774 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
775 | }; |
776 | ||
777 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
778 | { | |
496ad9aa | 779 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
780 | char *data; |
781 | ssize_t rv; | |
782 | ||
6e20a64a | 783 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
784 | return -EINVAL; |
785 | ||
786 | data = simple_transaction_get(file, buf, size); | |
787 | if (IS_ERR(data)) | |
788 | return PTR_ERR(data); | |
789 | ||
1872981b EP |
790 | rv = write_op[ino](file, data, size); |
791 | if (rv > 0) { | |
1da177e4 LT |
792 | simple_transaction_set(file, rv); |
793 | rv = size; | |
794 | } | |
795 | return rv; | |
796 | } | |
797 | ||
9c2e08c5 | 798 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
799 | .write = selinux_transaction_write, |
800 | .read = simple_transaction_read, | |
801 | .release = simple_transaction_release, | |
57a62c23 | 802 | .llseek = generic_file_llseek, |
1da177e4 LT |
803 | }; |
804 | ||
805 | /* | |
806 | * payload - write methods | |
807 | * If the method has a response, the response should be put in buf, | |
808 | * and the length returned. Otherwise return 0 or and -error. | |
809 | */ | |
810 | ||
1872981b | 811 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 812 | { |
0619f0f5 SS |
813 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
814 | struct selinux_state *state = fsi->state; | |
b77a493b | 815 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
816 | u32 ssid, tsid; |
817 | u16 tclass; | |
1da177e4 LT |
818 | struct av_decision avd; |
819 | ssize_t length; | |
820 | ||
6b6bc620 SS |
821 | length = avc_has_perm(&selinux_state, |
822 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 823 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); |
1da177e4 | 824 | if (length) |
b77a493b | 825 | goto out; |
1da177e4 LT |
826 | |
827 | length = -ENOMEM; | |
c1a7368a | 828 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 829 | if (!scon) |
b77a493b | 830 | goto out; |
1da177e4 | 831 | |
b77a493b | 832 | length = -ENOMEM; |
c1a7368a | 833 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
834 | if (!tcon) |
835 | goto out; | |
1da177e4 LT |
836 | |
837 | length = -EINVAL; | |
19439d05 | 838 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 839 | goto out; |
1da177e4 | 840 | |
0619f0f5 | 841 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
842 | if (length) |
843 | goto out; | |
844 | ||
0619f0f5 | 845 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
846 | if (length) |
847 | goto out; | |
1da177e4 | 848 | |
0619f0f5 | 849 | security_compute_av_user(state, ssid, tsid, tclass, &avd); |
1da177e4 LT |
850 | |
851 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 852 | "%x %x %x %x %u %x", |
f1c6381a | 853 | avd.allowed, 0xffffffff, |
1da177e4 | 854 | avd.auditallow, avd.auditdeny, |
8a6f83af | 855 | avd.seqno, avd.flags); |
1da177e4 | 856 | out: |
b77a493b | 857 | kfree(tcon); |
1da177e4 LT |
858 | kfree(scon); |
859 | return length; | |
860 | } | |
861 | ||
1872981b | 862 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 863 | { |
0619f0f5 SS |
864 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
865 | struct selinux_state *state = fsi->state; | |
b77a493b | 866 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 867 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
868 | u32 ssid, tsid, newsid; |
869 | u16 tclass; | |
870 | ssize_t length; | |
b77a493b | 871 | char *newcon = NULL; |
1da177e4 | 872 | u32 len; |
f50a3ec9 | 873 | int nargs; |
1da177e4 | 874 | |
6b6bc620 SS |
875 | length = avc_has_perm(&selinux_state, |
876 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
877 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, |
878 | NULL); | |
1da177e4 | 879 | if (length) |
b77a493b | 880 | goto out; |
1da177e4 LT |
881 | |
882 | length = -ENOMEM; | |
c1a7368a | 883 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 884 | if (!scon) |
b77a493b | 885 | goto out; |
1da177e4 | 886 | |
b77a493b | 887 | length = -ENOMEM; |
c1a7368a | 888 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
889 | if (!tcon) |
890 | goto out; | |
1da177e4 | 891 | |
f50a3ec9 KK |
892 | length = -ENOMEM; |
893 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
894 | if (!namebuf) | |
895 | goto out; | |
896 | ||
1da177e4 | 897 | length = -EINVAL; |
f50a3ec9 KK |
898 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
899 | if (nargs < 3 || nargs > 4) | |
b77a493b | 900 | goto out; |
0f7e4c33 KK |
901 | if (nargs == 4) { |
902 | /* | |
903 | * If and when the name of new object to be queried contains | |
904 | * either whitespace or multibyte characters, they shall be | |
905 | * encoded based on the percentage-encoding rule. | |
906 | * If not encoded, the sscanf logic picks up only left-half | |
907 | * of the supplied name; splitted by a whitespace unexpectedly. | |
908 | */ | |
909 | char *r, *w; | |
910 | int c1, c2; | |
911 | ||
912 | r = w = namebuf; | |
913 | do { | |
914 | c1 = *r++; | |
915 | if (c1 == '+') | |
916 | c1 = ' '; | |
917 | else if (c1 == '%') { | |
af7ff2c2 AS |
918 | c1 = hex_to_bin(*r++); |
919 | if (c1 < 0) | |
0f7e4c33 | 920 | goto out; |
af7ff2c2 AS |
921 | c2 = hex_to_bin(*r++); |
922 | if (c2 < 0) | |
0f7e4c33 KK |
923 | goto out; |
924 | c1 = (c1 << 4) | c2; | |
925 | } | |
926 | *w++ = c1; | |
927 | } while (c1 != '\0'); | |
928 | ||
f50a3ec9 | 929 | objname = namebuf; |
0f7e4c33 | 930 | } |
1da177e4 | 931 | |
0619f0f5 | 932 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
933 | if (length) |
934 | goto out; | |
935 | ||
0619f0f5 | 936 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
937 | if (length) |
938 | goto out; | |
1da177e4 | 939 | |
0619f0f5 SS |
940 | length = security_transition_sid_user(state, ssid, tsid, tclass, |
941 | objname, &newsid); | |
b77a493b EP |
942 | if (length) |
943 | goto out; | |
1da177e4 | 944 | |
0619f0f5 | 945 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
946 | if (length) |
947 | goto out; | |
1da177e4 | 948 | |
b77a493b | 949 | length = -ERANGE; |
1da177e4 | 950 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 951 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 952 | "payload max\n", __func__, len); |
b77a493b | 953 | goto out; |
1da177e4 LT |
954 | } |
955 | ||
956 | memcpy(buf, newcon, len); | |
957 | length = len; | |
b77a493b | 958 | out: |
1da177e4 | 959 | kfree(newcon); |
f50a3ec9 | 960 | kfree(namebuf); |
1da177e4 | 961 | kfree(tcon); |
1da177e4 LT |
962 | kfree(scon); |
963 | return length; | |
964 | } | |
965 | ||
1872981b | 966 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 967 | { |
0619f0f5 SS |
968 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
969 | struct selinux_state *state = fsi->state; | |
b77a493b | 970 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
971 | u32 ssid, tsid, newsid; |
972 | u16 tclass; | |
973 | ssize_t length; | |
b77a493b | 974 | char *newcon = NULL; |
1da177e4 LT |
975 | u32 len; |
976 | ||
6b6bc620 SS |
977 | length = avc_has_perm(&selinux_state, |
978 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
979 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, |
980 | NULL); | |
1da177e4 | 981 | if (length) |
b77a493b | 982 | goto out; |
1da177e4 LT |
983 | |
984 | length = -ENOMEM; | |
c1a7368a | 985 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 986 | if (!scon) |
b77a493b | 987 | goto out; |
1da177e4 | 988 | |
b77a493b | 989 | length = -ENOMEM; |
c1a7368a | 990 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
991 | if (!tcon) |
992 | goto out; | |
1da177e4 LT |
993 | |
994 | length = -EINVAL; | |
995 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 996 | goto out; |
1da177e4 | 997 | |
0619f0f5 | 998 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
999 | if (length) |
1000 | goto out; | |
1001 | ||
0619f0f5 | 1002 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1003 | if (length) |
1004 | goto out; | |
1da177e4 | 1005 | |
0619f0f5 | 1006 | length = security_change_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1007 | if (length) |
1008 | goto out; | |
1da177e4 | 1009 | |
0619f0f5 | 1010 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1011 | if (length) |
1012 | goto out; | |
1da177e4 | 1013 | |
b77a493b EP |
1014 | length = -ERANGE; |
1015 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
1016 | goto out; | |
1da177e4 LT |
1017 | |
1018 | memcpy(buf, newcon, len); | |
1019 | length = len; | |
b77a493b | 1020 | out: |
1da177e4 | 1021 | kfree(newcon); |
1da177e4 | 1022 | kfree(tcon); |
1da177e4 LT |
1023 | kfree(scon); |
1024 | return length; | |
1025 | } | |
1026 | ||
1872981b | 1027 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 1028 | { |
0619f0f5 SS |
1029 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1030 | struct selinux_state *state = fsi->state; | |
b77a493b EP |
1031 | char *con = NULL, *user = NULL, *ptr; |
1032 | u32 sid, *sids = NULL; | |
1da177e4 LT |
1033 | ssize_t length; |
1034 | char *newcon; | |
1035 | int i, rc; | |
1036 | u32 len, nsids; | |
1037 | ||
6b6bc620 SS |
1038 | length = avc_has_perm(&selinux_state, |
1039 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1040 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, |
1041 | NULL); | |
1da177e4 | 1042 | if (length) |
6eab04a8 | 1043 | goto out; |
1da177e4 LT |
1044 | |
1045 | length = -ENOMEM; | |
c1a7368a | 1046 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1047 | if (!con) |
6eab04a8 | 1048 | goto out; |
1da177e4 | 1049 | |
b77a493b | 1050 | length = -ENOMEM; |
c1a7368a | 1051 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1052 | if (!user) |
1053 | goto out; | |
1da177e4 LT |
1054 | |
1055 | length = -EINVAL; | |
1056 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 1057 | goto out; |
1da177e4 | 1058 | |
0619f0f5 | 1059 | length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL); |
b77a493b EP |
1060 | if (length) |
1061 | goto out; | |
1da177e4 | 1062 | |
0619f0f5 | 1063 | length = security_get_user_sids(state, sid, user, &sids, &nsids); |
b77a493b EP |
1064 | if (length) |
1065 | goto out; | |
1da177e4 LT |
1066 | |
1067 | length = sprintf(buf, "%u", nsids) + 1; | |
1068 | ptr = buf + length; | |
1069 | for (i = 0; i < nsids; i++) { | |
0619f0f5 | 1070 | rc = security_sid_to_context(state, sids[i], &newcon, &len); |
1da177e4 LT |
1071 | if (rc) { |
1072 | length = rc; | |
b77a493b | 1073 | goto out; |
1da177e4 LT |
1074 | } |
1075 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1076 | kfree(newcon); | |
1077 | length = -ERANGE; | |
b77a493b | 1078 | goto out; |
1da177e4 LT |
1079 | } |
1080 | memcpy(ptr, newcon, len); | |
1081 | kfree(newcon); | |
1082 | ptr += len; | |
1083 | length += len; | |
1084 | } | |
b77a493b | 1085 | out: |
1da177e4 | 1086 | kfree(sids); |
1da177e4 | 1087 | kfree(user); |
1da177e4 LT |
1088 | kfree(con); |
1089 | return length; | |
1090 | } | |
1091 | ||
1872981b | 1092 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1093 | { |
0619f0f5 SS |
1094 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1095 | struct selinux_state *state = fsi->state; | |
b77a493b | 1096 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1097 | u32 ssid, tsid, newsid; |
1098 | u16 tclass; | |
1099 | ssize_t length; | |
b77a493b | 1100 | char *newcon = NULL; |
1da177e4 LT |
1101 | u32 len; |
1102 | ||
6b6bc620 SS |
1103 | length = avc_has_perm(&selinux_state, |
1104 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1105 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, |
1106 | NULL); | |
1da177e4 | 1107 | if (length) |
b77a493b | 1108 | goto out; |
1da177e4 LT |
1109 | |
1110 | length = -ENOMEM; | |
c1a7368a | 1111 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1112 | if (!scon) |
6eab04a8 | 1113 | goto out; |
1da177e4 | 1114 | |
b77a493b | 1115 | length = -ENOMEM; |
c1a7368a | 1116 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1117 | if (!tcon) |
1118 | goto out; | |
1da177e4 LT |
1119 | |
1120 | length = -EINVAL; | |
1121 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1122 | goto out; |
1da177e4 | 1123 | |
0619f0f5 | 1124 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1125 | if (length) |
1126 | goto out; | |
1127 | ||
0619f0f5 | 1128 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1129 | if (length) |
1130 | goto out; | |
1da177e4 | 1131 | |
0619f0f5 | 1132 | length = security_member_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1133 | if (length) |
1134 | goto out; | |
1da177e4 | 1135 | |
0619f0f5 | 1136 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1137 | if (length) |
1138 | goto out; | |
1da177e4 | 1139 | |
b77a493b | 1140 | length = -ERANGE; |
1da177e4 | 1141 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1142 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1143 | "payload max\n", __func__, len); |
b77a493b | 1144 | goto out; |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | memcpy(buf, newcon, len); | |
1148 | length = len; | |
b77a493b | 1149 | out: |
1da177e4 | 1150 | kfree(newcon); |
1da177e4 | 1151 | kfree(tcon); |
1da177e4 LT |
1152 | kfree(scon); |
1153 | return length; | |
1154 | } | |
1155 | ||
1156 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1157 | { | |
1158 | struct inode *ret = new_inode(sb); | |
1159 | ||
1160 | if (ret) { | |
1161 | ret->i_mode = mode; | |
078cd827 | 1162 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1163 | } |
1164 | return ret; | |
1165 | } | |
1166 | ||
1da177e4 LT |
1167 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1168 | size_t count, loff_t *ppos) | |
1169 | { | |
0619f0f5 | 1170 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 LT |
1171 | char *page = NULL; |
1172 | ssize_t length; | |
1da177e4 LT |
1173 | ssize_t ret; |
1174 | int cur_enforcing; | |
496ad9aa | 1175 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1176 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1177 | |
0619f0f5 | 1178 | mutex_lock(&fsi->mutex); |
1da177e4 | 1179 | |
b77a493b | 1180 | ret = -EINVAL; |
0619f0f5 SS |
1181 | if (index >= fsi->bool_num || strcmp(name, |
1182 | fsi->bool_pending_names[index])) | |
0da74120 | 1183 | goto out_unlock; |
1da177e4 | 1184 | |
b77a493b | 1185 | ret = -ENOMEM; |
1872981b | 1186 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1187 | if (!page) |
0da74120 | 1188 | goto out_unlock; |
1da177e4 | 1189 | |
0619f0f5 | 1190 | cur_enforcing = security_get_bool_value(fsi->state, index); |
1da177e4 LT |
1191 | if (cur_enforcing < 0) { |
1192 | ret = cur_enforcing; | |
0da74120 | 1193 | goto out_unlock; |
1da177e4 | 1194 | } |
1da177e4 | 1195 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
0619f0f5 | 1196 | fsi->bool_pending_values[index]); |
0619f0f5 | 1197 | mutex_unlock(&fsi->mutex); |
0da74120 JH |
1198 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1199 | out_free: | |
b77a493b | 1200 | free_page((unsigned long)page); |
1da177e4 | 1201 | return ret; |
0da74120 JH |
1202 | |
1203 | out_unlock: | |
1204 | mutex_unlock(&fsi->mutex); | |
1205 | goto out_free; | |
1da177e4 LT |
1206 | } |
1207 | ||
1208 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1209 | size_t count, loff_t *ppos) | |
1210 | { | |
0619f0f5 | 1211 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1212 | char *page = NULL; |
d313f948 | 1213 | ssize_t length; |
1da177e4 | 1214 | int new_value; |
496ad9aa | 1215 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1216 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1217 | |
0da74120 JH |
1218 | if (count >= PAGE_SIZE) |
1219 | return -ENOMEM; | |
1220 | ||
1221 | /* No partial writes. */ | |
1222 | if (*ppos != 0) | |
1223 | return -EINVAL; | |
1224 | ||
1225 | page = memdup_user_nul(buf, count); | |
1226 | if (IS_ERR(page)) | |
1227 | return PTR_ERR(page); | |
1228 | ||
0619f0f5 | 1229 | mutex_lock(&fsi->mutex); |
1da177e4 | 1230 | |
6b6bc620 SS |
1231 | length = avc_has_perm(&selinux_state, |
1232 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1233 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1234 | NULL); | |
1da177e4 LT |
1235 | if (length) |
1236 | goto out; | |
1237 | ||
b77a493b | 1238 | length = -EINVAL; |
0619f0f5 SS |
1239 | if (index >= fsi->bool_num || strcmp(name, |
1240 | fsi->bool_pending_names[index])) | |
d313f948 | 1241 | goto out; |
d313f948 | 1242 | |
1da177e4 LT |
1243 | length = -EINVAL; |
1244 | if (sscanf(page, "%d", &new_value) != 1) | |
1245 | goto out; | |
1246 | ||
1247 | if (new_value) | |
1248 | new_value = 1; | |
1249 | ||
0619f0f5 | 1250 | fsi->bool_pending_values[index] = new_value; |
1da177e4 LT |
1251 | length = count; |
1252 | ||
1253 | out: | |
0619f0f5 | 1254 | mutex_unlock(&fsi->mutex); |
8365a719 | 1255 | kfree(page); |
1da177e4 LT |
1256 | return length; |
1257 | } | |
1258 | ||
9c2e08c5 | 1259 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1260 | .read = sel_read_bool, |
1261 | .write = sel_write_bool, | |
57a62c23 | 1262 | .llseek = generic_file_llseek, |
1da177e4 LT |
1263 | }; |
1264 | ||
1265 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1266 | const char __user *buf, | |
1267 | size_t count, loff_t *ppos) | |
1268 | { | |
0619f0f5 | 1269 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1270 | char *page = NULL; |
d313f948 | 1271 | ssize_t length; |
1da177e4 LT |
1272 | int new_value; |
1273 | ||
0da74120 JH |
1274 | if (count >= PAGE_SIZE) |
1275 | return -ENOMEM; | |
1276 | ||
1277 | /* No partial writes. */ | |
1278 | if (*ppos != 0) | |
1279 | return -EINVAL; | |
1280 | ||
1281 | page = memdup_user_nul(buf, count); | |
1282 | if (IS_ERR(page)) | |
1283 | return PTR_ERR(page); | |
1284 | ||
0619f0f5 | 1285 | mutex_lock(&fsi->mutex); |
1da177e4 | 1286 | |
6b6bc620 SS |
1287 | length = avc_has_perm(&selinux_state, |
1288 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1289 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1290 | NULL); | |
1da177e4 LT |
1291 | if (length) |
1292 | goto out; | |
1293 | ||
1da177e4 LT |
1294 | length = -EINVAL; |
1295 | if (sscanf(page, "%d", &new_value) != 1) | |
1296 | goto out; | |
1297 | ||
b77a493b | 1298 | length = 0; |
0619f0f5 SS |
1299 | if (new_value && fsi->bool_pending_values) |
1300 | length = security_set_bools(fsi->state, fsi->bool_num, | |
1301 | fsi->bool_pending_values); | |
1da177e4 | 1302 | |
b77a493b EP |
1303 | if (!length) |
1304 | length = count; | |
1da177e4 LT |
1305 | |
1306 | out: | |
0619f0f5 | 1307 | mutex_unlock(&fsi->mutex); |
8365a719 | 1308 | kfree(page); |
1da177e4 LT |
1309 | return length; |
1310 | } | |
1311 | ||
9c2e08c5 | 1312 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1313 | .write = sel_commit_bools_write, |
57a62c23 | 1314 | .llseek = generic_file_llseek, |
1da177e4 LT |
1315 | }; |
1316 | ||
0c92d7c7 | 1317 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1318 | { |
ad52184b AV |
1319 | d_genocide(de); |
1320 | shrink_dcache_parent(de); | |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | #define BOOL_DIR_NAME "booleans" | |
1324 | ||
0619f0f5 | 1325 | static int sel_make_bools(struct selinux_fs_info *fsi) |
1da177e4 | 1326 | { |
b77a493b | 1327 | int i, ret; |
1da177e4 LT |
1328 | ssize_t len; |
1329 | struct dentry *dentry = NULL; | |
0619f0f5 | 1330 | struct dentry *dir = fsi->bool_dir; |
1da177e4 LT |
1331 | struct inode *inode = NULL; |
1332 | struct inode_security_struct *isec; | |
1333 | char **names = NULL, *page; | |
1334 | int num; | |
1335 | int *values = NULL; | |
1336 | u32 sid; | |
1337 | ||
1338 | /* remove any existing files */ | |
0619f0f5 SS |
1339 | for (i = 0; i < fsi->bool_num; i++) |
1340 | kfree(fsi->bool_pending_names[i]); | |
1341 | kfree(fsi->bool_pending_names); | |
1342 | kfree(fsi->bool_pending_values); | |
1343 | fsi->bool_num = 0; | |
1344 | fsi->bool_pending_names = NULL; | |
1345 | fsi->bool_pending_values = NULL; | |
1da177e4 | 1346 | |
0c92d7c7 | 1347 | sel_remove_entries(dir); |
1da177e4 | 1348 | |
b77a493b | 1349 | ret = -ENOMEM; |
1872981b EP |
1350 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1351 | if (!page) | |
b77a493b | 1352 | goto out; |
1da177e4 | 1353 | |
0619f0f5 | 1354 | ret = security_get_bools(fsi->state, &num, &names, &values); |
b77a493b | 1355 | if (ret) |
1da177e4 LT |
1356 | goto out; |
1357 | ||
1358 | for (i = 0; i < num; i++) { | |
b77a493b | 1359 | ret = -ENOMEM; |
1da177e4 | 1360 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1361 | if (!dentry) |
1362 | goto out; | |
1363 | ||
1364 | ret = -ENOMEM; | |
1da177e4 | 1365 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
7e4237fa | 1366 | if (!inode) { |
1367 | dput(dentry); | |
b77a493b | 1368 | goto out; |
7e4237fa | 1369 | } |
1da177e4 | 1370 | |
b77a493b | 1371 | ret = -ENAMETOOLONG; |
cc1dad71 | 1372 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
7e4237fa | 1373 | if (len >= PAGE_SIZE) { |
1374 | dput(dentry); | |
1375 | iput(inode); | |
b77a493b | 1376 | goto out; |
7e4237fa | 1377 | } |
b77a493b | 1378 | |
80788c22 | 1379 | isec = selinux_inode(inode); |
0619f0f5 | 1380 | ret = security_genfs_sid(fsi->state, "selinuxfs", page, |
aa8e712c | 1381 | SECCLASS_FILE, &sid); |
4262fb51 | 1382 | if (ret) { |
900fde06 GT |
1383 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1384 | page); | |
1385 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1386 | } |
1387 | ||
1da177e4 | 1388 | isec->sid = sid; |
42059112 | 1389 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1390 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1391 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1392 | d_add(dentry, inode); |
1393 | } | |
0619f0f5 SS |
1394 | fsi->bool_num = num; |
1395 | fsi->bool_pending_names = names; | |
1396 | fsi->bool_pending_values = values; | |
b77a493b EP |
1397 | |
1398 | free_page((unsigned long)page); | |
1399 | return 0; | |
1da177e4 LT |
1400 | out: |
1401 | free_page((unsigned long)page); | |
b77a493b | 1402 | |
1da177e4 | 1403 | if (names) { |
9a5f04bf JJ |
1404 | for (i = 0; i < num; i++) |
1405 | kfree(names[i]); | |
1da177e4 LT |
1406 | kfree(names); |
1407 | } | |
20c19e41 | 1408 | kfree(values); |
0c92d7c7 | 1409 | sel_remove_entries(dir); |
b77a493b EP |
1410 | |
1411 | return ret; | |
1da177e4 LT |
1412 | } |
1413 | ||
1da177e4 LT |
1414 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
1415 | size_t count, loff_t *ppos) | |
1416 | { | |
6b6bc620 SS |
1417 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1418 | struct selinux_state *state = fsi->state; | |
1da177e4 LT |
1419 | char tmpbuf[TMPBUFLEN]; |
1420 | ssize_t length; | |
1421 | ||
6b6bc620 SS |
1422 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
1423 | avc_get_cache_threshold(state->avc)); | |
1da177e4 LT |
1424 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1425 | } | |
1426 | ||
1872981b EP |
1427 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1428 | const char __user *buf, | |
1da177e4 LT |
1429 | size_t count, loff_t *ppos) |
1430 | ||
1431 | { | |
6b6bc620 SS |
1432 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1433 | struct selinux_state *state = fsi->state; | |
8365a719 | 1434 | char *page; |
1da177e4 | 1435 | ssize_t ret; |
309c5fad | 1436 | unsigned int new_value; |
1da177e4 | 1437 | |
6b6bc620 SS |
1438 | ret = avc_has_perm(&selinux_state, |
1439 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1440 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, |
1441 | NULL); | |
b77a493b | 1442 | if (ret) |
8365a719 | 1443 | return ret; |
1da177e4 | 1444 | |
b77a493b | 1445 | if (count >= PAGE_SIZE) |
8365a719 | 1446 | return -ENOMEM; |
1da177e4 | 1447 | |
b77a493b | 1448 | /* No partial writes. */ |
b77a493b | 1449 | if (*ppos != 0) |
8365a719 | 1450 | return -EINVAL; |
1da177e4 | 1451 | |
8365a719 AV |
1452 | page = memdup_user_nul(buf, count); |
1453 | if (IS_ERR(page)) | |
1454 | return PTR_ERR(page); | |
1da177e4 | 1455 | |
b77a493b EP |
1456 | ret = -EINVAL; |
1457 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1458 | goto out; |
1da177e4 | 1459 | |
6b6bc620 | 1460 | avc_set_cache_threshold(state->avc, new_value); |
b77a493b | 1461 | |
1da177e4 | 1462 | ret = count; |
1da177e4 | 1463 | out: |
8365a719 | 1464 | kfree(page); |
1da177e4 LT |
1465 | return ret; |
1466 | } | |
1467 | ||
1468 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1469 | size_t count, loff_t *ppos) | |
1470 | { | |
6b6bc620 SS |
1471 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1472 | struct selinux_state *state = fsi->state; | |
1da177e4 | 1473 | char *page; |
b77a493b | 1474 | ssize_t length; |
1da177e4 LT |
1475 | |
1476 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1477 | if (!page) |
1478 | return -ENOMEM; | |
1479 | ||
6b6bc620 | 1480 | length = avc_get_hash_stats(state->avc, page); |
b77a493b EP |
1481 | if (length >= 0) |
1482 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1483 | free_page((unsigned long)page); |
b77a493b EP |
1484 | |
1485 | return length; | |
1da177e4 LT |
1486 | } |
1487 | ||
9c2e08c5 | 1488 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1489 | .read = sel_read_avc_cache_threshold, |
1490 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1491 | .llseek = generic_file_llseek, |
1da177e4 LT |
1492 | }; |
1493 | ||
9c2e08c5 | 1494 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1495 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1496 | .llseek = generic_file_llseek, |
1da177e4 LT |
1497 | }; |
1498 | ||
1499 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1500 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1501 | { | |
1502 | int cpu; | |
1503 | ||
4f4b6c1a | 1504 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1505 | if (!cpu_possible(cpu)) |
1506 | continue; | |
1507 | *idx = cpu + 1; | |
1508 | return &per_cpu(avc_cache_stats, cpu); | |
1509 | } | |
1510 | return NULL; | |
1511 | } | |
1512 | ||
1513 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1514 | { | |
1515 | loff_t n = *pos - 1; | |
1516 | ||
1517 | if (*pos == 0) | |
1518 | return SEQ_START_TOKEN; | |
1519 | ||
1520 | return sel_avc_get_stat_idx(&n); | |
1521 | } | |
1522 | ||
1523 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1524 | { | |
1525 | return sel_avc_get_stat_idx(pos); | |
1526 | } | |
1527 | ||
1528 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1529 | { | |
1530 | struct avc_cache_stats *st = v; | |
1531 | ||
710a0647 ME |
1532 | if (v == SEQ_START_TOKEN) { |
1533 | seq_puts(seq, | |
1534 | "lookups hits misses allocations reclaims frees\n"); | |
1535 | } else { | |
257313b2 LT |
1536 | unsigned int lookups = st->lookups; |
1537 | unsigned int misses = st->misses; | |
1538 | unsigned int hits = lookups - misses; | |
1539 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1540 | hits, misses, st->allocations, | |
1da177e4 | 1541 | st->reclaims, st->frees); |
257313b2 | 1542 | } |
1da177e4 LT |
1543 | return 0; |
1544 | } | |
1545 | ||
1546 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1547 | { } | |
1548 | ||
1996a109 | 1549 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1550 | .start = sel_avc_stats_seq_start, |
1551 | .next = sel_avc_stats_seq_next, | |
1552 | .show = sel_avc_stats_seq_show, | |
1553 | .stop = sel_avc_stats_seq_stop, | |
1554 | }; | |
1555 | ||
1556 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1557 | { | |
1558 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1559 | } | |
1560 | ||
9c2e08c5 | 1561 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1562 | .open = sel_open_avc_cache_stats, |
1563 | .read = seq_read, | |
1564 | .llseek = seq_lseek, | |
1565 | .release = seq_release, | |
1566 | }; | |
1567 | #endif | |
1568 | ||
1569 | static int sel_make_avc_files(struct dentry *dir) | |
1570 | { | |
0619f0f5 SS |
1571 | struct super_block *sb = dir->d_sb; |
1572 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
b77a493b | 1573 | int i; |
cda37124 | 1574 | static const struct tree_descr files[] = { |
1da177e4 LT |
1575 | { "cache_threshold", |
1576 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1577 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1578 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1579 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1580 | #endif | |
1581 | }; | |
1582 | ||
6e20a64a | 1583 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1584 | struct inode *inode; |
1585 | struct dentry *dentry; | |
1586 | ||
1587 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1588 | if (!dentry) |
1589 | return -ENOMEM; | |
1da177e4 LT |
1590 | |
1591 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
7e4237fa | 1592 | if (!inode) { |
1593 | dput(dentry); | |
b77a493b | 1594 | return -ENOMEM; |
7e4237fa | 1595 | } |
b77a493b | 1596 | |
1da177e4 | 1597 | inode->i_fop = files[i].ops; |
0619f0f5 | 1598 | inode->i_ino = ++fsi->last_ino; |
1da177e4 LT |
1599 | d_add(dentry, inode); |
1600 | } | |
b77a493b EP |
1601 | |
1602 | return 0; | |
1da177e4 LT |
1603 | } |
1604 | ||
1872981b | 1605 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1606 | size_t count, loff_t *ppos) |
1607 | { | |
0619f0f5 | 1608 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
f0ee2e46 JC |
1609 | char *con; |
1610 | u32 sid, len; | |
1611 | ssize_t ret; | |
1612 | ||
496ad9aa | 1613 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
0619f0f5 | 1614 | ret = security_sid_to_context(fsi->state, sid, &con, &len); |
b77a493b | 1615 | if (ret) |
f0ee2e46 JC |
1616 | return ret; |
1617 | ||
1618 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1619 | kfree(con); | |
1620 | return ret; | |
1621 | } | |
1622 | ||
1623 | static const struct file_operations sel_initcon_ops = { | |
1624 | .read = sel_read_initcon, | |
57a62c23 | 1625 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1626 | }; |
1627 | ||
1628 | static int sel_make_initcon_files(struct dentry *dir) | |
1629 | { | |
b77a493b | 1630 | int i; |
f0ee2e46 JC |
1631 | |
1632 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1633 | struct inode *inode; | |
1634 | struct dentry *dentry; | |
1635 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1636 | if (!dentry) |
1637 | return -ENOMEM; | |
f0ee2e46 JC |
1638 | |
1639 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1640 | if (!inode) { |
1641 | dput(dentry); | |
b77a493b | 1642 | return -ENOMEM; |
7e4237fa | 1643 | } |
b77a493b | 1644 | |
f0ee2e46 JC |
1645 | inode->i_fop = &sel_initcon_ops; |
1646 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1647 | d_add(dentry, inode); | |
1648 | } | |
b77a493b EP |
1649 | |
1650 | return 0; | |
f0ee2e46 JC |
1651 | } |
1652 | ||
e47c8fc5 CP |
1653 | static inline unsigned long sel_class_to_ino(u16 class) |
1654 | { | |
1655 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1656 | } | |
1657 | ||
1658 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1659 | { | |
92ae9e82 | 1660 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1661 | } |
1662 | ||
1663 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1664 | { | |
1665 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1666 | } | |
1667 | ||
1668 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1669 | { | |
1670 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1671 | } | |
1672 | ||
1872981b | 1673 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1674 | size_t count, loff_t *ppos) |
1675 | { | |
496ad9aa | 1676 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1677 | char res[TMPBUFLEN]; |
1678 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1679 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1680 | } |
1681 | ||
1682 | static const struct file_operations sel_class_ops = { | |
1683 | .read = sel_read_class, | |
57a62c23 | 1684 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1685 | }; |
1686 | ||
1872981b | 1687 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1688 | size_t count, loff_t *ppos) |
1689 | { | |
496ad9aa | 1690 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1691 | char res[TMPBUFLEN]; |
1692 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1693 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1694 | } |
1695 | ||
1696 | static const struct file_operations sel_perm_ops = { | |
1697 | .read = sel_read_perm, | |
57a62c23 | 1698 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1699 | }; |
1700 | ||
3bb56b25 PM |
1701 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1702 | size_t count, loff_t *ppos) | |
1703 | { | |
0619f0f5 | 1704 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
3bb56b25 PM |
1705 | int value; |
1706 | char tmpbuf[TMPBUFLEN]; | |
1707 | ssize_t length; | |
496ad9aa | 1708 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 | 1709 | |
0619f0f5 | 1710 | value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK); |
3bb56b25 PM |
1711 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); |
1712 | ||
1713 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1714 | } | |
1715 | ||
1716 | static const struct file_operations sel_policycap_ops = { | |
1717 | .read = sel_read_policycap, | |
57a62c23 | 1718 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1719 | }; |
1720 | ||
e47c8fc5 CP |
1721 | static int sel_make_perm_files(char *objclass, int classvalue, |
1722 | struct dentry *dir) | |
1723 | { | |
0619f0f5 | 1724 | struct selinux_fs_info *fsi = dir->d_sb->s_fs_info; |
b77a493b | 1725 | int i, rc, nperms; |
e47c8fc5 CP |
1726 | char **perms; |
1727 | ||
0619f0f5 | 1728 | rc = security_get_permissions(fsi->state, objclass, &perms, &nperms); |
e47c8fc5 | 1729 | if (rc) |
b77a493b | 1730 | return rc; |
e47c8fc5 CP |
1731 | |
1732 | for (i = 0; i < nperms; i++) { | |
1733 | struct inode *inode; | |
1734 | struct dentry *dentry; | |
1735 | ||
b77a493b | 1736 | rc = -ENOMEM; |
e47c8fc5 | 1737 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1738 | if (!dentry) |
1739 | goto out; | |
e47c8fc5 | 1740 | |
b77a493b | 1741 | rc = -ENOMEM; |
e47c8fc5 | 1742 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
7e4237fa | 1743 | if (!inode) { |
1744 | dput(dentry); | |
b77a493b | 1745 | goto out; |
7e4237fa | 1746 | } |
b77a493b | 1747 | |
e47c8fc5 CP |
1748 | inode->i_fop = &sel_perm_ops; |
1749 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1750 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1751 | d_add(dentry, inode); |
1752 | } | |
b77a493b EP |
1753 | rc = 0; |
1754 | out: | |
e47c8fc5 CP |
1755 | for (i = 0; i < nperms; i++) |
1756 | kfree(perms[i]); | |
1757 | kfree(perms); | |
e47c8fc5 CP |
1758 | return rc; |
1759 | } | |
1760 | ||
1761 | static int sel_make_class_dir_entries(char *classname, int index, | |
1762 | struct dentry *dir) | |
1763 | { | |
0619f0f5 SS |
1764 | struct super_block *sb = dir->d_sb; |
1765 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
e47c8fc5 CP |
1766 | struct dentry *dentry = NULL; |
1767 | struct inode *inode = NULL; | |
1768 | int rc; | |
1769 | ||
1770 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1771 | if (!dentry) |
1772 | return -ENOMEM; | |
e47c8fc5 CP |
1773 | |
1774 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1775 | if (!inode) { |
1776 | dput(dentry); | |
b77a493b | 1777 | return -ENOMEM; |
7e4237fa | 1778 | } |
e47c8fc5 CP |
1779 | |
1780 | inode->i_fop = &sel_class_ops; | |
1781 | inode->i_ino = sel_class_to_ino(index); | |
1782 | d_add(dentry, inode); | |
1783 | ||
0619f0f5 | 1784 | dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); |
a1c2aa1e AV |
1785 | if (IS_ERR(dentry)) |
1786 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1787 | |
1788 | rc = sel_make_perm_files(classname, index, dentry); | |
1789 | ||
e47c8fc5 CP |
1790 | return rc; |
1791 | } | |
1792 | ||
0619f0f5 | 1793 | static int sel_make_classes(struct selinux_fs_info *fsi) |
e47c8fc5 | 1794 | { |
0619f0f5 | 1795 | |
b77a493b | 1796 | int rc, nclasses, i; |
e47c8fc5 CP |
1797 | char **classes; |
1798 | ||
1799 | /* delete any existing entries */ | |
0619f0f5 | 1800 | sel_remove_entries(fsi->class_dir); |
e47c8fc5 | 1801 | |
0619f0f5 | 1802 | rc = security_get_classes(fsi->state, &classes, &nclasses); |
b77a493b EP |
1803 | if (rc) |
1804 | return rc; | |
e47c8fc5 CP |
1805 | |
1806 | /* +2 since classes are 1-indexed */ | |
0619f0f5 | 1807 | fsi->last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1808 | |
1809 | for (i = 0; i < nclasses; i++) { | |
1810 | struct dentry *class_name_dir; | |
1811 | ||
0619f0f5 SS |
1812 | class_name_dir = sel_make_dir(fsi->class_dir, classes[i], |
1813 | &fsi->last_class_ino); | |
a1c2aa1e AV |
1814 | if (IS_ERR(class_name_dir)) { |
1815 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1816 | goto out; |
a1c2aa1e | 1817 | } |
e47c8fc5 CP |
1818 | |
1819 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1820 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1821 | class_name_dir); |
1822 | if (rc) | |
b77a493b | 1823 | goto out; |
e47c8fc5 | 1824 | } |
b77a493b EP |
1825 | rc = 0; |
1826 | out: | |
e47c8fc5 CP |
1827 | for (i = 0; i < nclasses; i++) |
1828 | kfree(classes[i]); | |
1829 | kfree(classes); | |
e47c8fc5 CP |
1830 | return rc; |
1831 | } | |
1832 | ||
0619f0f5 | 1833 | static int sel_make_policycap(struct selinux_fs_info *fsi) |
3bb56b25 PM |
1834 | { |
1835 | unsigned int iter; | |
1836 | struct dentry *dentry = NULL; | |
1837 | struct inode *inode = NULL; | |
1838 | ||
0619f0f5 | 1839 | sel_remove_entries(fsi->policycap_dir); |
3bb56b25 PM |
1840 | |
1841 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
4dc2fce3 | 1842 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
0619f0f5 | 1843 | dentry = d_alloc_name(fsi->policycap_dir, |
4dc2fce3 | 1844 | selinux_policycap_names[iter]); |
3bb56b25 | 1845 | else |
0619f0f5 | 1846 | dentry = d_alloc_name(fsi->policycap_dir, "unknown"); |
3bb56b25 PM |
1847 | |
1848 | if (dentry == NULL) | |
1849 | return -ENOMEM; | |
1850 | ||
0619f0f5 | 1851 | inode = sel_make_inode(fsi->sb, S_IFREG | 0444); |
7e4237fa | 1852 | if (inode == NULL) { |
1853 | dput(dentry); | |
3bb56b25 | 1854 | return -ENOMEM; |
7e4237fa | 1855 | } |
3bb56b25 PM |
1856 | |
1857 | inode->i_fop = &sel_policycap_ops; | |
1858 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1859 | d_add(dentry, inode); | |
1860 | } | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
a1c2aa1e | 1865 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1866 | unsigned long *ino) |
1da177e4 | 1867 | { |
a1c2aa1e | 1868 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1869 | struct inode *inode; |
1870 | ||
a1c2aa1e AV |
1871 | if (!dentry) |
1872 | return ERR_PTR(-ENOMEM); | |
1873 | ||
1874 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1875 | if (!inode) { | |
1876 | dput(dentry); | |
1877 | return ERR_PTR(-ENOMEM); | |
1878 | } | |
b77a493b | 1879 | |
1da177e4 LT |
1880 | inode->i_op = &simple_dir_inode_operations; |
1881 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1882 | inode->i_ino = ++(*ino); |
40e906f8 | 1883 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1884 | inc_nlink(inode); |
1da177e4 | 1885 | d_add(dentry, inode); |
edb20fb5 | 1886 | /* bump link count on parent directory, too */ |
ce0b16dd | 1887 | inc_nlink(d_inode(dir)); |
b77a493b | 1888 | |
a1c2aa1e | 1889 | return dentry; |
1da177e4 LT |
1890 | } |
1891 | ||
0619f0f5 SS |
1892 | #define NULL_FILE_NAME "null" |
1893 | ||
1872981b | 1894 | static int sel_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4 | 1895 | { |
0619f0f5 | 1896 | struct selinux_fs_info *fsi; |
1da177e4 LT |
1897 | int ret; |
1898 | struct dentry *dentry; | |
a1c2aa1e | 1899 | struct inode *inode; |
1da177e4 LT |
1900 | struct inode_security_struct *isec; |
1901 | ||
cda37124 | 1902 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
1903 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
1904 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1905 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1906 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1907 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1908 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1909 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1910 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1911 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1912 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1913 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1914 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1915 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1916 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1917 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1918 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1919 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1920 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1921 | S_IWUGO}, | |
1da177e4 LT |
1922 | /* last one */ {""} |
1923 | }; | |
0619f0f5 SS |
1924 | |
1925 | ret = selinux_fs_info_create(sb); | |
1926 | if (ret) | |
1927 | goto err; | |
1928 | ||
1da177e4 LT |
1929 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
1930 | if (ret) | |
161ce45a | 1931 | goto err; |
1da177e4 | 1932 | |
0619f0f5 SS |
1933 | fsi = sb->s_fs_info; |
1934 | fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); | |
1935 | if (IS_ERR(fsi->bool_dir)) { | |
1936 | ret = PTR_ERR(fsi->bool_dir); | |
1937 | fsi->bool_dir = NULL; | |
161ce45a | 1938 | goto err; |
a1c2aa1e | 1939 | } |
1da177e4 | 1940 | |
b77a493b | 1941 | ret = -ENOMEM; |
1da177e4 | 1942 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1943 | if (!dentry) |
161ce45a | 1944 | goto err; |
1da177e4 | 1945 | |
b77a493b | 1946 | ret = -ENOMEM; |
1da177e4 | 1947 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
7e4237fa | 1948 | if (!inode) { |
1949 | dput(dentry); | |
161ce45a | 1950 | goto err; |
7e4237fa | 1951 | } |
b77a493b | 1952 | |
0619f0f5 | 1953 | inode->i_ino = ++fsi->last_ino; |
80788c22 | 1954 | isec = selinux_inode(inode); |
1da177e4 LT |
1955 | isec->sid = SECINITSID_DEVNULL; |
1956 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1957 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1958 | |
1959 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1960 | d_add(dentry, inode); | |
1da177e4 | 1961 | |
0619f0f5 | 1962 | dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); |
a1c2aa1e AV |
1963 | if (IS_ERR(dentry)) { |
1964 | ret = PTR_ERR(dentry); | |
161ce45a | 1965 | goto err; |
a1c2aa1e | 1966 | } |
1da177e4 LT |
1967 | |
1968 | ret = sel_make_avc_files(dentry); | |
1969 | if (ret) | |
161ce45a | 1970 | goto err; |
f0ee2e46 | 1971 | |
0619f0f5 | 1972 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); |
a1c2aa1e AV |
1973 | if (IS_ERR(dentry)) { |
1974 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1975 | goto err; |
a1c2aa1e | 1976 | } |
f0ee2e46 JC |
1977 | |
1978 | ret = sel_make_initcon_files(dentry); | |
1979 | if (ret) | |
1980 | goto err; | |
1981 | ||
0619f0f5 SS |
1982 | fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino); |
1983 | if (IS_ERR(fsi->class_dir)) { | |
1984 | ret = PTR_ERR(fsi->class_dir); | |
1985 | fsi->class_dir = NULL; | |
3bb56b25 | 1986 | goto err; |
a1c2aa1e | 1987 | } |
3bb56b25 | 1988 | |
0619f0f5 SS |
1989 | fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", |
1990 | &fsi->last_ino); | |
1991 | if (IS_ERR(fsi->policycap_dir)) { | |
1992 | ret = PTR_ERR(fsi->policycap_dir); | |
1993 | fsi->policycap_dir = NULL; | |
3bb56b25 | 1994 | goto err; |
a1c2aa1e | 1995 | } |
0619f0f5 SS |
1996 | |
1997 | ret = sel_make_policy_nodes(fsi); | |
1998 | if (ret) | |
1999 | goto err; | |
b77a493b | 2000 | return 0; |
161ce45a | 2001 | err: |
f8b69a5f | 2002 | pr_err("SELinux: %s: failed while creating inodes\n", |
744ba35e | 2003 | __func__); |
0619f0f5 SS |
2004 | |
2005 | selinux_fs_info_free(sb); | |
2006 | ||
b77a493b | 2007 | return ret; |
1da177e4 LT |
2008 | } |
2009 | ||
fc14f2fe AV |
2010 | static struct dentry *sel_mount(struct file_system_type *fs_type, |
2011 | int flags, const char *dev_name, void *data) | |
1da177e4 | 2012 | { |
fc14f2fe | 2013 | return mount_single(fs_type, flags, data, sel_fill_super); |
1da177e4 LT |
2014 | } |
2015 | ||
0619f0f5 SS |
2016 | static void sel_kill_sb(struct super_block *sb) |
2017 | { | |
2018 | selinux_fs_info_free(sb); | |
2019 | kill_litter_super(sb); | |
2020 | } | |
2021 | ||
1da177e4 LT |
2022 | static struct file_system_type sel_fs_type = { |
2023 | .name = "selinuxfs", | |
fc14f2fe | 2024 | .mount = sel_mount, |
0619f0f5 | 2025 | .kill_sb = sel_kill_sb, |
1da177e4 LT |
2026 | }; |
2027 | ||
2028 | struct vfsmount *selinuxfs_mount; | |
0619f0f5 | 2029 | struct path selinux_null; |
1da177e4 LT |
2030 | |
2031 | static int __init init_sel_fs(void) | |
2032 | { | |
0619f0f5 SS |
2033 | struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, |
2034 | sizeof(NULL_FILE_NAME)-1); | |
1da177e4 LT |
2035 | int err; |
2036 | ||
2037 | if (!selinux_enabled) | |
2038 | return 0; | |
7a627e3b | 2039 | |
f9bb4882 EB |
2040 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
2041 | if (err) | |
2042 | return err; | |
7a627e3b | 2043 | |
1da177e4 | 2044 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 2045 | if (err) { |
f9bb4882 | 2046 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 2047 | return err; |
7a627e3b | 2048 | } |
b77a493b | 2049 | |
765927b2 | 2050 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b | 2051 | if (IS_ERR(selinuxfs_mount)) { |
f8b69a5f | 2052 | pr_err("selinuxfs: could not mount!\n"); |
b77a493b EP |
2053 | err = PTR_ERR(selinuxfs_mount); |
2054 | selinuxfs_mount = NULL; | |
1da177e4 | 2055 | } |
0619f0f5 SS |
2056 | selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, |
2057 | &null_name); | |
2058 | if (IS_ERR(selinux_null.dentry)) { | |
2059 | pr_err("selinuxfs: could not lookup null!\n"); | |
2060 | err = PTR_ERR(selinux_null.dentry); | |
2061 | selinux_null.dentry = NULL; | |
2062 | } | |
b77a493b | 2063 | |
1da177e4 LT |
2064 | return err; |
2065 | } | |
2066 | ||
2067 | __initcall(init_sel_fs); | |
2068 | ||
2069 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
2070 | void exit_sel_fs(void) | |
2071 | { | |
f9bb4882 | 2072 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
fd40ffc7 | 2073 | dput(selinux_null.dentry); |
423e0ab0 | 2074 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
2075 | unregister_filesystem(&sel_fs_type); |
2076 | } | |
2077 | #endif |