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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> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/string.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/major.h> | |
27 | #include <linux/seq_file.h> | |
28 | #include <linux/percpu.h> | |
af601e46 | 29 | #include <linux/audit.h> |
f5269710 | 30 | #include <linux/uaccess.h> |
7a627e3b | 31 | #include <linux/kobject.h> |
0f7e4c33 | 32 | #include <linux/ctype.h> |
1da177e4 LT |
33 | |
34 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
35 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
36 | ||
37 | #include "flask.h" | |
38 | #include "avc.h" | |
39 | #include "avc_ss.h" | |
40 | #include "security.h" | |
41 | #include "objsec.h" | |
42 | #include "conditional.h" | |
43 | ||
1da177e4 LT |
44 | enum sel_inos { |
45 | SEL_ROOT_INO = 2, | |
46 | SEL_LOAD, /* load policy */ | |
47 | SEL_ENFORCE, /* get or set enforcing status */ | |
48 | SEL_CONTEXT, /* validate context */ | |
49 | SEL_ACCESS, /* compute access decision */ | |
50 | SEL_CREATE, /* compute create labeling decision */ | |
51 | SEL_RELABEL, /* compute relabeling decision */ | |
52 | SEL_USER, /* compute reachable user contexts */ | |
53 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
54 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
55 | SEL_MLS, /* return if MLS policy is enabled */ | |
56 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
57 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
58 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 59 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
60 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
61 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 62 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 63 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 64 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 65 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
66 | }; |
67 | ||
0619f0f5 SS |
68 | struct selinux_fs_info { |
69 | struct dentry *bool_dir; | |
70 | unsigned int bool_num; | |
71 | char **bool_pending_names; | |
72 | unsigned int *bool_pending_values; | |
73 | struct dentry *class_dir; | |
74 | unsigned long last_class_ino; | |
75 | bool policy_opened; | |
76 | struct dentry *policycap_dir; | |
77 | struct mutex mutex; | |
78 | unsigned long last_ino; | |
79 | struct selinux_state *state; | |
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 | ||
91 | mutex_init(&fsi->mutex); | |
92 | fsi->last_ino = SEL_INO_NEXT - 1; | |
93 | fsi->state = &selinux_state; | |
94 | fsi->sb = sb; | |
95 | sb->s_fs_info = fsi; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static void selinux_fs_info_free(struct super_block *sb) | |
100 | { | |
101 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
102 | int i; | |
103 | ||
104 | if (fsi) { | |
105 | for (i = 0; i < fsi->bool_num; i++) | |
106 | kfree(fsi->bool_pending_names[i]); | |
107 | kfree(fsi->bool_pending_names); | |
108 | kfree(fsi->bool_pending_values); | |
109 | } | |
110 | kfree(sb->s_fs_info); | |
111 | sb->s_fs_info = NULL; | |
112 | } | |
6174eafc | 113 | |
3bb56b25 PM |
114 | #define SEL_INITCON_INO_OFFSET 0x01000000 |
115 | #define SEL_BOOL_INO_OFFSET 0x02000000 | |
116 | #define SEL_CLASS_INO_OFFSET 0x04000000 | |
117 | #define SEL_POLICYCAP_INO_OFFSET 0x08000000 | |
118 | #define SEL_INO_MASK 0x00ffffff | |
f0ee2e46 | 119 | |
1da177e4 LT |
120 | #define TMPBUFLEN 12 |
121 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
122 | size_t count, loff_t *ppos) | |
123 | { | |
0619f0f5 | 124 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
125 | char tmpbuf[TMPBUFLEN]; |
126 | ssize_t length; | |
127 | ||
aa8e712c | 128 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 129 | enforcing_enabled(fsi->state)); |
1da177e4 LT |
130 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
131 | } | |
132 | ||
133 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 134 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
135 | size_t count, loff_t *ppos) |
136 | ||
137 | { | |
0619f0f5 SS |
138 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
139 | struct selinux_state *state = fsi->state; | |
b77a493b | 140 | char *page = NULL; |
1da177e4 | 141 | ssize_t length; |
aa8e712c | 142 | int 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; | |
156 | if (sscanf(page, "%d", &new_value) != 1) | |
157 | goto out; | |
158 | ||
ea49d10e SS |
159 | new_value = !!new_value; |
160 | ||
0619f0f5 | 161 | old_value = enforcing_enabled(state); |
aa8e712c | 162 | if (new_value != old_value) { |
6b6bc620 SS |
163 | length = avc_has_perm(&selinux_state, |
164 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
165 | SECCLASS_SECURITY, SECURITY__SETENFORCE, |
166 | NULL); | |
1da177e4 LT |
167 | if (length) |
168 | goto out; | |
cdfb6b34 | 169 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 RGB |
170 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
171 | " enabled=%d old-enabled=%d lsm=selinux res=1", | |
aa8e712c | 172 | new_value, old_value, |
581abc09 | 173 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4195ed42 RGB |
174 | audit_get_sessionid(current), |
175 | selinux_enabled, selinux_enabled); | |
0619f0f5 | 176 | enforcing_set(state, new_value); |
aa8e712c | 177 | if (new_value) |
6b6bc620 | 178 | avc_ss_reset(state->avc, 0); |
aa8e712c | 179 | selnl_notify_setenforce(new_value); |
0619f0f5 | 180 | selinux_status_update_setenforce(state, new_value); |
aa8e712c | 181 | if (!new_value) |
42df744c | 182 | call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL); |
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 | { | |
0619f0f5 SS |
202 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
203 | struct selinux_state *state = fsi->state; | |
3f12070e EP |
204 | char tmpbuf[TMPBUFLEN]; |
205 | ssize_t length; | |
496ad9aa | 206 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e | 207 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
0619f0f5 SS |
208 | security_get_reject_unknown(state) : |
209 | !security_get_allow_unknown(state); | |
3f12070e EP |
210 | |
211 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
212 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
213 | } | |
214 | ||
215 | static const struct file_operations sel_handle_unknown_ops = { | |
216 | .read = sel_read_handle_unknown, | |
57a62c23 | 217 | .llseek = generic_file_llseek, |
3f12070e EP |
218 | }; |
219 | ||
11904167 KK |
220 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
221 | { | |
0619f0f5 SS |
222 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
223 | struct page *status = selinux_kernel_status_page(fsi->state); | |
11904167 KK |
224 | |
225 | if (!status) | |
226 | return -ENOMEM; | |
227 | ||
228 | filp->private_data = status; | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
234 | size_t count, loff_t *ppos) | |
235 | { | |
236 | struct page *status = filp->private_data; | |
237 | ||
238 | BUG_ON(!status); | |
239 | ||
240 | return simple_read_from_buffer(buf, count, ppos, | |
241 | page_address(status), | |
242 | sizeof(struct selinux_kernel_status)); | |
243 | } | |
244 | ||
245 | static int sel_mmap_handle_status(struct file *filp, | |
246 | struct vm_area_struct *vma) | |
247 | { | |
248 | struct page *status = filp->private_data; | |
249 | unsigned long size = vma->vm_end - vma->vm_start; | |
250 | ||
251 | BUG_ON(!status); | |
252 | ||
253 | /* only allows one page from the head */ | |
254 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
255 | return -EIO; | |
256 | /* disallow writable mapping */ | |
257 | if (vma->vm_flags & VM_WRITE) | |
258 | return -EPERM; | |
259 | /* disallow mprotect() turns it into writable */ | |
260 | vma->vm_flags &= ~VM_MAYWRITE; | |
261 | ||
262 | return remap_pfn_range(vma, vma->vm_start, | |
263 | page_to_pfn(status), | |
264 | size, vma->vm_page_prot); | |
265 | } | |
266 | ||
267 | static const struct file_operations sel_handle_status_ops = { | |
268 | .open = sel_open_handle_status, | |
269 | .read = sel_read_handle_status, | |
270 | .mmap = sel_mmap_handle_status, | |
271 | .llseek = generic_file_llseek, | |
272 | }; | |
273 | ||
1da177e4 | 274 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 275 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
276 | size_t count, loff_t *ppos) |
277 | ||
278 | { | |
0619f0f5 | 279 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 280 | char *page; |
1da177e4 LT |
281 | ssize_t length; |
282 | int new_value; | |
4195ed42 | 283 | int enforcing; |
1da177e4 | 284 | |
bfd51626 | 285 | if (count >= PAGE_SIZE) |
8365a719 | 286 | return -ENOMEM; |
b77a493b EP |
287 | |
288 | /* No partial writes. */ | |
b77a493b | 289 | if (*ppos != 0) |
8365a719 | 290 | return -EINVAL; |
b77a493b | 291 | |
8365a719 AV |
292 | page = memdup_user_nul(buf, count); |
293 | if (IS_ERR(page)) | |
294 | return PTR_ERR(page); | |
1da177e4 LT |
295 | |
296 | length = -EINVAL; | |
297 | if (sscanf(page, "%d", &new_value) != 1) | |
298 | goto out; | |
299 | ||
300 | if (new_value) { | |
4195ed42 | 301 | enforcing = enforcing_enabled(fsi->state); |
0619f0f5 | 302 | length = selinux_disable(fsi->state); |
b77a493b | 303 | if (length) |
1da177e4 | 304 | goto out; |
cdfb6b34 | 305 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 RGB |
306 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
307 | " enabled=%d old-enabled=%d lsm=selinux res=1", | |
308 | enforcing, enforcing, | |
581abc09 | 309 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4195ed42 | 310 | audit_get_sessionid(current), 0, 1); |
1da177e4 LT |
311 | } |
312 | ||
313 | length = count; | |
314 | out: | |
8365a719 | 315 | kfree(page); |
1da177e4 LT |
316 | return length; |
317 | } | |
318 | #else | |
319 | #define sel_write_disable NULL | |
320 | #endif | |
321 | ||
9c2e08c5 | 322 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 323 | .write = sel_write_disable, |
57a62c23 | 324 | .llseek = generic_file_llseek, |
1da177e4 LT |
325 | }; |
326 | ||
327 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 328 | size_t count, loff_t *ppos) |
1da177e4 LT |
329 | { |
330 | char tmpbuf[TMPBUFLEN]; | |
331 | ssize_t length; | |
332 | ||
333 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
334 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
335 | } | |
336 | ||
9c2e08c5 | 337 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 338 | .read = sel_read_policyvers, |
57a62c23 | 339 | .llseek = generic_file_llseek, |
1da177e4 LT |
340 | }; |
341 | ||
342 | /* declaration for sel_write_load */ | |
0619f0f5 SS |
343 | static int sel_make_bools(struct selinux_fs_info *fsi); |
344 | static int sel_make_classes(struct selinux_fs_info *fsi); | |
345 | static int sel_make_policycap(struct selinux_fs_info *fsi); | |
e47c8fc5 CP |
346 | |
347 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 348 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 349 | unsigned long *ino); |
1da177e4 LT |
350 | |
351 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, | |
352 | size_t count, loff_t *ppos) | |
353 | { | |
0619f0f5 | 354 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
355 | char tmpbuf[TMPBUFLEN]; |
356 | ssize_t length; | |
357 | ||
0719aaf5 | 358 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 359 | security_mls_enabled(fsi->state)); |
1da177e4 LT |
360 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
361 | } | |
362 | ||
9c2e08c5 | 363 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 364 | .read = sel_read_mls, |
57a62c23 | 365 | .llseek = generic_file_llseek, |
1da177e4 LT |
366 | }; |
367 | ||
cee74f47 EP |
368 | struct policy_load_memory { |
369 | size_t len; | |
370 | void *data; | |
371 | }; | |
372 | ||
373 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
374 | { | |
0619f0f5 SS |
375 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
376 | struct selinux_state *state = fsi->state; | |
cee74f47 EP |
377 | struct policy_load_memory *plm = NULL; |
378 | int rc; | |
379 | ||
380 | BUG_ON(filp->private_data); | |
381 | ||
0619f0f5 | 382 | mutex_lock(&fsi->mutex); |
cee74f47 | 383 | |
6b6bc620 SS |
384 | rc = avc_has_perm(&selinux_state, |
385 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 386 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 EP |
387 | if (rc) |
388 | goto err; | |
389 | ||
390 | rc = -EBUSY; | |
0619f0f5 | 391 | if (fsi->policy_opened) |
cee74f47 EP |
392 | goto err; |
393 | ||
394 | rc = -ENOMEM; | |
395 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
396 | if (!plm) | |
397 | goto err; | |
398 | ||
0619f0f5 | 399 | if (i_size_read(inode) != security_policydb_len(state)) { |
5955102c | 400 | inode_lock(inode); |
0619f0f5 | 401 | i_size_write(inode, security_policydb_len(state)); |
5955102c | 402 | inode_unlock(inode); |
cee74f47 EP |
403 | } |
404 | ||
0619f0f5 | 405 | rc = security_read_policy(state, &plm->data, &plm->len); |
cee74f47 EP |
406 | if (rc) |
407 | goto err; | |
408 | ||
0619f0f5 | 409 | fsi->policy_opened = 1; |
cee74f47 EP |
410 | |
411 | filp->private_data = plm; | |
412 | ||
0619f0f5 | 413 | mutex_unlock(&fsi->mutex); |
cee74f47 EP |
414 | |
415 | return 0; | |
416 | err: | |
0619f0f5 | 417 | mutex_unlock(&fsi->mutex); |
cee74f47 EP |
418 | |
419 | if (plm) | |
420 | vfree(plm->data); | |
421 | kfree(plm); | |
422 | return rc; | |
423 | } | |
424 | ||
425 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
426 | { | |
0619f0f5 | 427 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
428 | struct policy_load_memory *plm = filp->private_data; |
429 | ||
430 | BUG_ON(!plm); | |
431 | ||
0619f0f5 | 432 | fsi->policy_opened = 0; |
cee74f47 EP |
433 | |
434 | vfree(plm->data); | |
435 | kfree(plm); | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
441 | size_t count, loff_t *ppos) | |
442 | { | |
443 | struct policy_load_memory *plm = filp->private_data; | |
444 | int ret; | |
445 | ||
6b6bc620 SS |
446 | ret = avc_has_perm(&selinux_state, |
447 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 448 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 | 449 | if (ret) |
0da74120 | 450 | return ret; |
cee74f47 | 451 | |
0da74120 | 452 | return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); |
cee74f47 EP |
453 | } |
454 | ||
ac9a1f6d | 455 | static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 456 | { |
11bac800 | 457 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
458 | unsigned long offset; |
459 | struct page *page; | |
460 | ||
461 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
462 | return VM_FAULT_SIGBUS; | |
463 | ||
464 | offset = vmf->pgoff << PAGE_SHIFT; | |
465 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
466 | return VM_FAULT_SIGBUS; | |
467 | ||
468 | page = vmalloc_to_page(plm->data + offset); | |
469 | get_page(page); | |
470 | ||
471 | vmf->page = page; | |
472 | ||
473 | return 0; | |
474 | } | |
475 | ||
7cbea8dc | 476 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
477 | .fault = sel_mmap_policy_fault, |
478 | .page_mkwrite = sel_mmap_policy_fault, | |
479 | }; | |
480 | ||
ad3fa08c | 481 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
482 | { |
483 | if (vma->vm_flags & VM_SHARED) { | |
484 | /* do not allow mprotect to make mapping writable */ | |
485 | vma->vm_flags &= ~VM_MAYWRITE; | |
486 | ||
487 | if (vma->vm_flags & VM_WRITE) | |
488 | return -EACCES; | |
489 | } | |
490 | ||
314e51b9 | 491 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
492 | vma->vm_ops = &sel_mmap_policy_ops; |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
cee74f47 EP |
497 | static const struct file_operations sel_policy_ops = { |
498 | .open = sel_open_policy, | |
499 | .read = sel_read_policy, | |
845ca30f | 500 | .mmap = sel_mmap_policy, |
cee74f47 | 501 | .release = sel_release_policy, |
47a93a5b | 502 | .llseek = generic_file_llseek, |
cee74f47 EP |
503 | }; |
504 | ||
0619f0f5 SS |
505 | static int sel_make_policy_nodes(struct selinux_fs_info *fsi) |
506 | { | |
507 | int ret; | |
508 | ||
509 | ret = sel_make_bools(fsi); | |
510 | if (ret) { | |
511 | pr_err("SELinux: failed to load policy booleans\n"); | |
512 | return ret; | |
513 | } | |
514 | ||
515 | ret = sel_make_classes(fsi); | |
516 | if (ret) { | |
517 | pr_err("SELinux: failed to load policy classes\n"); | |
518 | return ret; | |
519 | } | |
520 | ||
521 | ret = sel_make_policycap(fsi); | |
522 | if (ret) { | |
523 | pr_err("SELinux: failed to load policy capabilities\n"); | |
524 | return ret; | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
1872981b | 530 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
531 | size_t count, loff_t *ppos) |
532 | ||
533 | { | |
0619f0f5 | 534 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1da177e4 LT |
535 | ssize_t length; |
536 | void *data = NULL; | |
537 | ||
0619f0f5 | 538 | mutex_lock(&fsi->mutex); |
1da177e4 | 539 | |
6b6bc620 SS |
540 | length = avc_has_perm(&selinux_state, |
541 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 542 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); |
1da177e4 LT |
543 | if (length) |
544 | goto out; | |
545 | ||
b77a493b EP |
546 | /* No partial writes. */ |
547 | length = -EINVAL; | |
548 | if (*ppos != 0) | |
1da177e4 | 549 | goto out; |
1da177e4 | 550 | |
b77a493b EP |
551 | length = -EFBIG; |
552 | if (count > 64 * 1024 * 1024) | |
553 | goto out; | |
554 | ||
555 | length = -ENOMEM; | |
556 | data = vmalloc(count); | |
557 | if (!data) | |
1da177e4 | 558 | goto out; |
1da177e4 LT |
559 | |
560 | length = -EFAULT; | |
561 | if (copy_from_user(data, buf, count) != 0) | |
562 | goto out; | |
563 | ||
0619f0f5 | 564 | length = security_load_policy(fsi->state, data, count); |
4262fb51 GT |
565 | if (length) { |
566 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 567 | goto out; |
4262fb51 | 568 | } |
1da177e4 | 569 | |
0619f0f5 SS |
570 | length = sel_make_policy_nodes(fsi); |
571 | if (length) | |
b77a493b EP |
572 | goto out1; |
573 | ||
574 | length = count; | |
e47c8fc5 CP |
575 | |
576 | out1: | |
cdfb6b34 | 577 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
d141136f | 578 | "auid=%u ses=%u lsm=selinux res=1", |
581abc09 | 579 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 580 | audit_get_sessionid(current)); |
1da177e4 | 581 | out: |
0619f0f5 | 582 | mutex_unlock(&fsi->mutex); |
1da177e4 LT |
583 | vfree(data); |
584 | return length; | |
585 | } | |
586 | ||
9c2e08c5 | 587 | static const struct file_operations sel_load_ops = { |
1da177e4 | 588 | .write = sel_write_load, |
57a62c23 | 589 | .llseek = generic_file_llseek, |
1da177e4 LT |
590 | }; |
591 | ||
1872981b | 592 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 593 | { |
0619f0f5 SS |
594 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
595 | struct selinux_state *state = fsi->state; | |
b77a493b | 596 | char *canon = NULL; |
ce9982d0 | 597 | u32 sid, len; |
1da177e4 LT |
598 | ssize_t length; |
599 | ||
6b6bc620 SS |
600 | length = avc_has_perm(&selinux_state, |
601 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 602 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); |
1da177e4 | 603 | if (length) |
b77a493b | 604 | goto out; |
1da177e4 | 605 | |
0619f0f5 | 606 | length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
607 | if (length) |
608 | goto out; | |
1da177e4 | 609 | |
0619f0f5 | 610 | length = security_sid_to_context(state, sid, &canon, &len); |
b77a493b EP |
611 | if (length) |
612 | goto out; | |
ce9982d0 | 613 | |
b77a493b | 614 | length = -ERANGE; |
ce9982d0 | 615 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 616 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 617 | "payload max\n", __func__, len); |
1da177e4 | 618 | goto out; |
ce9982d0 | 619 | } |
1da177e4 | 620 | |
ce9982d0 SS |
621 | memcpy(buf, canon, len); |
622 | length = len; | |
1da177e4 | 623 | out: |
ce9982d0 | 624 | kfree(canon); |
1da177e4 LT |
625 | return length; |
626 | } | |
627 | ||
1da177e4 LT |
628 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
629 | size_t count, loff_t *ppos) | |
630 | { | |
0619f0f5 | 631 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
632 | char tmpbuf[TMPBUFLEN]; |
633 | ssize_t length; | |
634 | ||
0619f0f5 | 635 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot); |
1da177e4 LT |
636 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
637 | } | |
638 | ||
1872981b | 639 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
640 | size_t count, loff_t *ppos) |
641 | { | |
0619f0f5 | 642 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 643 | char *page; |
1da177e4 LT |
644 | ssize_t length; |
645 | unsigned int new_value; | |
646 | ||
6b6bc620 SS |
647 | length = avc_has_perm(&selinux_state, |
648 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
649 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, |
650 | NULL); | |
1da177e4 | 651 | if (length) |
8365a719 | 652 | return length; |
1da177e4 | 653 | |
bfd51626 | 654 | if (count >= PAGE_SIZE) |
8365a719 | 655 | return -ENOMEM; |
b77a493b EP |
656 | |
657 | /* No partial writes. */ | |
b77a493b | 658 | if (*ppos != 0) |
8365a719 | 659 | return -EINVAL; |
b77a493b | 660 | |
8365a719 AV |
661 | page = memdup_user_nul(buf, count); |
662 | if (IS_ERR(page)) | |
663 | return PTR_ERR(page); | |
1da177e4 LT |
664 | |
665 | length = -EINVAL; | |
666 | if (sscanf(page, "%u", &new_value) != 1) | |
667 | goto out; | |
668 | ||
0619f0f5 | 669 | fsi->state->checkreqprot = new_value ? 1 : 0; |
1da177e4 LT |
670 | length = count; |
671 | out: | |
8365a719 | 672 | kfree(page); |
1da177e4 LT |
673 | return length; |
674 | } | |
9c2e08c5 | 675 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
676 | .read = sel_read_checkreqprot, |
677 | .write = sel_write_checkreqprot, | |
57a62c23 | 678 | .llseek = generic_file_llseek, |
1da177e4 LT |
679 | }; |
680 | ||
f9df6458 AP |
681 | static ssize_t sel_write_validatetrans(struct file *file, |
682 | const char __user *buf, | |
683 | size_t count, loff_t *ppos) | |
684 | { | |
0619f0f5 SS |
685 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
686 | struct selinux_state *state = fsi->state; | |
f9df6458 AP |
687 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; |
688 | char *req = NULL; | |
689 | u32 osid, nsid, tsid; | |
690 | u16 tclass; | |
691 | int rc; | |
692 | ||
6b6bc620 SS |
693 | rc = avc_has_perm(&selinux_state, |
694 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 695 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); |
f9df6458 AP |
696 | if (rc) |
697 | goto out; | |
698 | ||
699 | rc = -ENOMEM; | |
700 | if (count >= PAGE_SIZE) | |
701 | goto out; | |
702 | ||
703 | /* No partial writes. */ | |
704 | rc = -EINVAL; | |
705 | if (*ppos != 0) | |
706 | goto out; | |
707 | ||
0b884d25 AV |
708 | req = memdup_user_nul(buf, count); |
709 | if (IS_ERR(req)) { | |
710 | rc = PTR_ERR(req); | |
711 | req = NULL; | |
f9df6458 | 712 | goto out; |
0b884d25 | 713 | } |
f9df6458 AP |
714 | |
715 | rc = -ENOMEM; | |
716 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
717 | if (!oldcon) | |
718 | goto out; | |
719 | ||
720 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
721 | if (!newcon) | |
722 | goto out; | |
723 | ||
724 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
725 | if (!taskcon) | |
726 | goto out; | |
727 | ||
728 | rc = -EINVAL; | |
729 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
730 | goto out; | |
731 | ||
0619f0f5 | 732 | rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL); |
f9df6458 AP |
733 | if (rc) |
734 | goto out; | |
735 | ||
0619f0f5 | 736 | rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL); |
f9df6458 AP |
737 | if (rc) |
738 | goto out; | |
739 | ||
0619f0f5 | 740 | rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL); |
f9df6458 AP |
741 | if (rc) |
742 | goto out; | |
743 | ||
0619f0f5 | 744 | rc = security_validate_transition_user(state, osid, nsid, tsid, tclass); |
f9df6458 AP |
745 | if (!rc) |
746 | rc = count; | |
747 | out: | |
748 | kfree(req); | |
749 | kfree(oldcon); | |
750 | kfree(newcon); | |
751 | kfree(taskcon); | |
752 | return rc; | |
753 | } | |
754 | ||
755 | static const struct file_operations sel_transition_ops = { | |
756 | .write = sel_write_validatetrans, | |
757 | .llseek = generic_file_llseek, | |
758 | }; | |
759 | ||
1da177e4 LT |
760 | /* |
761 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
762 | */ | |
1872981b EP |
763 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
764 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
765 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
766 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
767 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 | 768 | |
631d2b49 | 769 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
1da177e4 LT |
770 | [SEL_ACCESS] = sel_write_access, |
771 | [SEL_CREATE] = sel_write_create, | |
772 | [SEL_RELABEL] = sel_write_relabel, | |
773 | [SEL_USER] = sel_write_user, | |
774 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 775 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
776 | }; |
777 | ||
778 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
779 | { | |
496ad9aa | 780 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
781 | char *data; |
782 | ssize_t rv; | |
783 | ||
6e20a64a | 784 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
785 | return -EINVAL; |
786 | ||
787 | data = simple_transaction_get(file, buf, size); | |
788 | if (IS_ERR(data)) | |
789 | return PTR_ERR(data); | |
790 | ||
1872981b EP |
791 | rv = write_op[ino](file, data, size); |
792 | if (rv > 0) { | |
1da177e4 LT |
793 | simple_transaction_set(file, rv); |
794 | rv = size; | |
795 | } | |
796 | return rv; | |
797 | } | |
798 | ||
9c2e08c5 | 799 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
800 | .write = selinux_transaction_write, |
801 | .read = simple_transaction_read, | |
802 | .release = simple_transaction_release, | |
57a62c23 | 803 | .llseek = generic_file_llseek, |
1da177e4 LT |
804 | }; |
805 | ||
806 | /* | |
807 | * payload - write methods | |
808 | * If the method has a response, the response should be put in buf, | |
809 | * and the length returned. Otherwise return 0 or and -error. | |
810 | */ | |
811 | ||
1872981b | 812 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 813 | { |
0619f0f5 SS |
814 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
815 | struct selinux_state *state = fsi->state; | |
b77a493b | 816 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
817 | u32 ssid, tsid; |
818 | u16 tclass; | |
1da177e4 LT |
819 | struct av_decision avd; |
820 | ssize_t length; | |
821 | ||
6b6bc620 SS |
822 | length = avc_has_perm(&selinux_state, |
823 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 824 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); |
1da177e4 | 825 | if (length) |
b77a493b | 826 | goto out; |
1da177e4 LT |
827 | |
828 | length = -ENOMEM; | |
c1a7368a | 829 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 830 | if (!scon) |
b77a493b | 831 | goto out; |
1da177e4 | 832 | |
b77a493b | 833 | length = -ENOMEM; |
c1a7368a | 834 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
835 | if (!tcon) |
836 | goto out; | |
1da177e4 LT |
837 | |
838 | length = -EINVAL; | |
19439d05 | 839 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 840 | goto out; |
1da177e4 | 841 | |
0619f0f5 | 842 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
843 | if (length) |
844 | goto out; | |
845 | ||
0619f0f5 | 846 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
847 | if (length) |
848 | goto out; | |
1da177e4 | 849 | |
0619f0f5 | 850 | security_compute_av_user(state, ssid, tsid, tclass, &avd); |
1da177e4 LT |
851 | |
852 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 853 | "%x %x %x %x %u %x", |
f1c6381a | 854 | avd.allowed, 0xffffffff, |
1da177e4 | 855 | avd.auditallow, avd.auditdeny, |
8a6f83af | 856 | avd.seqno, avd.flags); |
1da177e4 | 857 | out: |
b77a493b | 858 | kfree(tcon); |
1da177e4 LT |
859 | kfree(scon); |
860 | return length; | |
861 | } | |
862 | ||
1872981b | 863 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 864 | { |
0619f0f5 SS |
865 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
866 | struct selinux_state *state = fsi->state; | |
b77a493b | 867 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 868 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
869 | u32 ssid, tsid, newsid; |
870 | u16 tclass; | |
871 | ssize_t length; | |
b77a493b | 872 | char *newcon = NULL; |
1da177e4 | 873 | u32 len; |
f50a3ec9 | 874 | int nargs; |
1da177e4 | 875 | |
6b6bc620 SS |
876 | length = avc_has_perm(&selinux_state, |
877 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
878 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, |
879 | NULL); | |
1da177e4 | 880 | if (length) |
b77a493b | 881 | goto out; |
1da177e4 LT |
882 | |
883 | length = -ENOMEM; | |
c1a7368a | 884 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 885 | if (!scon) |
b77a493b | 886 | goto out; |
1da177e4 | 887 | |
b77a493b | 888 | length = -ENOMEM; |
c1a7368a | 889 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
890 | if (!tcon) |
891 | goto out; | |
1da177e4 | 892 | |
f50a3ec9 KK |
893 | length = -ENOMEM; |
894 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
895 | if (!namebuf) | |
896 | goto out; | |
897 | ||
1da177e4 | 898 | length = -EINVAL; |
f50a3ec9 KK |
899 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
900 | if (nargs < 3 || nargs > 4) | |
b77a493b | 901 | goto out; |
0f7e4c33 KK |
902 | if (nargs == 4) { |
903 | /* | |
904 | * If and when the name of new object to be queried contains | |
905 | * either whitespace or multibyte characters, they shall be | |
906 | * encoded based on the percentage-encoding rule. | |
907 | * If not encoded, the sscanf logic picks up only left-half | |
908 | * of the supplied name; splitted by a whitespace unexpectedly. | |
909 | */ | |
910 | char *r, *w; | |
911 | int c1, c2; | |
912 | ||
913 | r = w = namebuf; | |
914 | do { | |
915 | c1 = *r++; | |
916 | if (c1 == '+') | |
917 | c1 = ' '; | |
918 | else if (c1 == '%') { | |
af7ff2c2 AS |
919 | c1 = hex_to_bin(*r++); |
920 | if (c1 < 0) | |
0f7e4c33 | 921 | goto out; |
af7ff2c2 AS |
922 | c2 = hex_to_bin(*r++); |
923 | if (c2 < 0) | |
0f7e4c33 KK |
924 | goto out; |
925 | c1 = (c1 << 4) | c2; | |
926 | } | |
927 | *w++ = c1; | |
928 | } while (c1 != '\0'); | |
929 | ||
f50a3ec9 | 930 | objname = namebuf; |
0f7e4c33 | 931 | } |
1da177e4 | 932 | |
0619f0f5 | 933 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
934 | if (length) |
935 | goto out; | |
936 | ||
0619f0f5 | 937 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
938 | if (length) |
939 | goto out; | |
1da177e4 | 940 | |
0619f0f5 SS |
941 | length = security_transition_sid_user(state, ssid, tsid, tclass, |
942 | objname, &newsid); | |
b77a493b EP |
943 | if (length) |
944 | goto out; | |
1da177e4 | 945 | |
0619f0f5 | 946 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
947 | if (length) |
948 | goto out; | |
1da177e4 | 949 | |
b77a493b | 950 | length = -ERANGE; |
1da177e4 | 951 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 952 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 953 | "payload max\n", __func__, len); |
b77a493b | 954 | goto out; |
1da177e4 LT |
955 | } |
956 | ||
957 | memcpy(buf, newcon, len); | |
958 | length = len; | |
b77a493b | 959 | out: |
1da177e4 | 960 | kfree(newcon); |
f50a3ec9 | 961 | kfree(namebuf); |
1da177e4 | 962 | kfree(tcon); |
1da177e4 LT |
963 | kfree(scon); |
964 | return length; | |
965 | } | |
966 | ||
1872981b | 967 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 968 | { |
0619f0f5 SS |
969 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
970 | struct selinux_state *state = fsi->state; | |
b77a493b | 971 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
972 | u32 ssid, tsid, newsid; |
973 | u16 tclass; | |
974 | ssize_t length; | |
b77a493b | 975 | char *newcon = NULL; |
1da177e4 LT |
976 | u32 len; |
977 | ||
6b6bc620 SS |
978 | length = avc_has_perm(&selinux_state, |
979 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
980 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, |
981 | NULL); | |
1da177e4 | 982 | if (length) |
b77a493b | 983 | goto out; |
1da177e4 LT |
984 | |
985 | length = -ENOMEM; | |
c1a7368a | 986 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 987 | if (!scon) |
b77a493b | 988 | goto out; |
1da177e4 | 989 | |
b77a493b | 990 | length = -ENOMEM; |
c1a7368a | 991 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
992 | if (!tcon) |
993 | goto out; | |
1da177e4 LT |
994 | |
995 | length = -EINVAL; | |
996 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 997 | goto out; |
1da177e4 | 998 | |
0619f0f5 | 999 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1000 | if (length) |
1001 | goto out; | |
1002 | ||
0619f0f5 | 1003 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1004 | if (length) |
1005 | goto out; | |
1da177e4 | 1006 | |
0619f0f5 | 1007 | length = security_change_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1008 | if (length) |
1009 | goto out; | |
1da177e4 | 1010 | |
0619f0f5 | 1011 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1012 | if (length) |
1013 | goto out; | |
1da177e4 | 1014 | |
b77a493b EP |
1015 | length = -ERANGE; |
1016 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
1017 | goto out; | |
1da177e4 LT |
1018 | |
1019 | memcpy(buf, newcon, len); | |
1020 | length = len; | |
b77a493b | 1021 | out: |
1da177e4 | 1022 | kfree(newcon); |
1da177e4 | 1023 | kfree(tcon); |
1da177e4 LT |
1024 | kfree(scon); |
1025 | return length; | |
1026 | } | |
1027 | ||
1872981b | 1028 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 1029 | { |
0619f0f5 SS |
1030 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1031 | struct selinux_state *state = fsi->state; | |
b77a493b EP |
1032 | char *con = NULL, *user = NULL, *ptr; |
1033 | u32 sid, *sids = NULL; | |
1da177e4 LT |
1034 | ssize_t length; |
1035 | char *newcon; | |
1036 | int i, rc; | |
1037 | u32 len, nsids; | |
1038 | ||
6b6bc620 SS |
1039 | length = avc_has_perm(&selinux_state, |
1040 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1041 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, |
1042 | NULL); | |
1da177e4 | 1043 | if (length) |
6eab04a8 | 1044 | goto out; |
1da177e4 LT |
1045 | |
1046 | length = -ENOMEM; | |
c1a7368a | 1047 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1048 | if (!con) |
6eab04a8 | 1049 | goto out; |
1da177e4 | 1050 | |
b77a493b | 1051 | length = -ENOMEM; |
c1a7368a | 1052 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1053 | if (!user) |
1054 | goto out; | |
1da177e4 LT |
1055 | |
1056 | length = -EINVAL; | |
1057 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 1058 | goto out; |
1da177e4 | 1059 | |
0619f0f5 | 1060 | length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL); |
b77a493b EP |
1061 | if (length) |
1062 | goto out; | |
1da177e4 | 1063 | |
0619f0f5 | 1064 | length = security_get_user_sids(state, sid, user, &sids, &nsids); |
b77a493b EP |
1065 | if (length) |
1066 | goto out; | |
1da177e4 LT |
1067 | |
1068 | length = sprintf(buf, "%u", nsids) + 1; | |
1069 | ptr = buf + length; | |
1070 | for (i = 0; i < nsids; i++) { | |
0619f0f5 | 1071 | rc = security_sid_to_context(state, sids[i], &newcon, &len); |
1da177e4 LT |
1072 | if (rc) { |
1073 | length = rc; | |
b77a493b | 1074 | goto out; |
1da177e4 LT |
1075 | } |
1076 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1077 | kfree(newcon); | |
1078 | length = -ERANGE; | |
b77a493b | 1079 | goto out; |
1da177e4 LT |
1080 | } |
1081 | memcpy(ptr, newcon, len); | |
1082 | kfree(newcon); | |
1083 | ptr += len; | |
1084 | length += len; | |
1085 | } | |
b77a493b | 1086 | out: |
1da177e4 | 1087 | kfree(sids); |
1da177e4 | 1088 | kfree(user); |
1da177e4 LT |
1089 | kfree(con); |
1090 | return length; | |
1091 | } | |
1092 | ||
1872981b | 1093 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1094 | { |
0619f0f5 SS |
1095 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1096 | struct selinux_state *state = fsi->state; | |
b77a493b | 1097 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1098 | u32 ssid, tsid, newsid; |
1099 | u16 tclass; | |
1100 | ssize_t length; | |
b77a493b | 1101 | char *newcon = NULL; |
1da177e4 LT |
1102 | u32 len; |
1103 | ||
6b6bc620 SS |
1104 | length = avc_has_perm(&selinux_state, |
1105 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1106 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, |
1107 | NULL); | |
1da177e4 | 1108 | if (length) |
b77a493b | 1109 | goto out; |
1da177e4 LT |
1110 | |
1111 | length = -ENOMEM; | |
c1a7368a | 1112 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1113 | if (!scon) |
6eab04a8 | 1114 | goto out; |
1da177e4 | 1115 | |
b77a493b | 1116 | length = -ENOMEM; |
c1a7368a | 1117 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1118 | if (!tcon) |
1119 | goto out; | |
1da177e4 LT |
1120 | |
1121 | length = -EINVAL; | |
1122 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1123 | goto out; |
1da177e4 | 1124 | |
0619f0f5 | 1125 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1126 | if (length) |
1127 | goto out; | |
1128 | ||
0619f0f5 | 1129 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1130 | if (length) |
1131 | goto out; | |
1da177e4 | 1132 | |
0619f0f5 | 1133 | length = security_member_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1134 | if (length) |
1135 | goto out; | |
1da177e4 | 1136 | |
0619f0f5 | 1137 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1138 | if (length) |
1139 | goto out; | |
1da177e4 | 1140 | |
b77a493b | 1141 | length = -ERANGE; |
1da177e4 | 1142 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1143 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1144 | "payload max\n", __func__, len); |
b77a493b | 1145 | goto out; |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | memcpy(buf, newcon, len); | |
1149 | length = len; | |
b77a493b | 1150 | out: |
1da177e4 | 1151 | kfree(newcon); |
1da177e4 | 1152 | kfree(tcon); |
1da177e4 LT |
1153 | kfree(scon); |
1154 | return length; | |
1155 | } | |
1156 | ||
1157 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1158 | { | |
1159 | struct inode *ret = new_inode(sb); | |
1160 | ||
1161 | if (ret) { | |
1162 | ret->i_mode = mode; | |
078cd827 | 1163 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1164 | } |
1165 | return ret; | |
1166 | } | |
1167 | ||
1da177e4 LT |
1168 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1169 | size_t count, loff_t *ppos) | |
1170 | { | |
0619f0f5 | 1171 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 LT |
1172 | char *page = NULL; |
1173 | ssize_t length; | |
1da177e4 LT |
1174 | ssize_t ret; |
1175 | int cur_enforcing; | |
496ad9aa | 1176 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1177 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1178 | |
0619f0f5 | 1179 | mutex_lock(&fsi->mutex); |
1da177e4 | 1180 | |
b77a493b | 1181 | ret = -EINVAL; |
0619f0f5 SS |
1182 | if (index >= fsi->bool_num || strcmp(name, |
1183 | fsi->bool_pending_names[index])) | |
0da74120 | 1184 | goto out_unlock; |
1da177e4 | 1185 | |
b77a493b | 1186 | ret = -ENOMEM; |
1872981b | 1187 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1188 | if (!page) |
0da74120 | 1189 | goto out_unlock; |
1da177e4 | 1190 | |
0619f0f5 | 1191 | cur_enforcing = security_get_bool_value(fsi->state, index); |
1da177e4 LT |
1192 | if (cur_enforcing < 0) { |
1193 | ret = cur_enforcing; | |
0da74120 | 1194 | goto out_unlock; |
1da177e4 | 1195 | } |
1da177e4 | 1196 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
0619f0f5 | 1197 | fsi->bool_pending_values[index]); |
0619f0f5 | 1198 | mutex_unlock(&fsi->mutex); |
0da74120 JH |
1199 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1200 | out_free: | |
b77a493b | 1201 | free_page((unsigned long)page); |
1da177e4 | 1202 | return ret; |
0da74120 JH |
1203 | |
1204 | out_unlock: | |
1205 | mutex_unlock(&fsi->mutex); | |
1206 | goto out_free; | |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1210 | size_t count, loff_t *ppos) | |
1211 | { | |
0619f0f5 | 1212 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1213 | char *page = NULL; |
d313f948 | 1214 | ssize_t length; |
1da177e4 | 1215 | int new_value; |
496ad9aa | 1216 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1217 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1218 | |
0da74120 JH |
1219 | if (count >= PAGE_SIZE) |
1220 | return -ENOMEM; | |
1221 | ||
1222 | /* No partial writes. */ | |
1223 | if (*ppos != 0) | |
1224 | return -EINVAL; | |
1225 | ||
1226 | page = memdup_user_nul(buf, count); | |
1227 | if (IS_ERR(page)) | |
1228 | return PTR_ERR(page); | |
1229 | ||
0619f0f5 | 1230 | mutex_lock(&fsi->mutex); |
1da177e4 | 1231 | |
6b6bc620 SS |
1232 | length = avc_has_perm(&selinux_state, |
1233 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1234 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1235 | NULL); | |
1da177e4 LT |
1236 | if (length) |
1237 | goto out; | |
1238 | ||
b77a493b | 1239 | length = -EINVAL; |
0619f0f5 SS |
1240 | if (index >= fsi->bool_num || strcmp(name, |
1241 | fsi->bool_pending_names[index])) | |
d313f948 | 1242 | goto out; |
d313f948 | 1243 | |
1da177e4 LT |
1244 | length = -EINVAL; |
1245 | if (sscanf(page, "%d", &new_value) != 1) | |
1246 | goto out; | |
1247 | ||
1248 | if (new_value) | |
1249 | new_value = 1; | |
1250 | ||
0619f0f5 | 1251 | fsi->bool_pending_values[index] = new_value; |
1da177e4 LT |
1252 | length = count; |
1253 | ||
1254 | out: | |
0619f0f5 | 1255 | mutex_unlock(&fsi->mutex); |
8365a719 | 1256 | kfree(page); |
1da177e4 LT |
1257 | return length; |
1258 | } | |
1259 | ||
9c2e08c5 | 1260 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1261 | .read = sel_read_bool, |
1262 | .write = sel_write_bool, | |
57a62c23 | 1263 | .llseek = generic_file_llseek, |
1da177e4 LT |
1264 | }; |
1265 | ||
1266 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1267 | const char __user *buf, | |
1268 | size_t count, loff_t *ppos) | |
1269 | { | |
0619f0f5 | 1270 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1271 | char *page = NULL; |
d313f948 | 1272 | ssize_t length; |
1da177e4 LT |
1273 | int new_value; |
1274 | ||
0da74120 JH |
1275 | if (count >= PAGE_SIZE) |
1276 | return -ENOMEM; | |
1277 | ||
1278 | /* No partial writes. */ | |
1279 | if (*ppos != 0) | |
1280 | return -EINVAL; | |
1281 | ||
1282 | page = memdup_user_nul(buf, count); | |
1283 | if (IS_ERR(page)) | |
1284 | return PTR_ERR(page); | |
1285 | ||
0619f0f5 | 1286 | mutex_lock(&fsi->mutex); |
1da177e4 | 1287 | |
6b6bc620 SS |
1288 | length = avc_has_perm(&selinux_state, |
1289 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1290 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1291 | NULL); | |
1da177e4 LT |
1292 | if (length) |
1293 | goto out; | |
1294 | ||
1da177e4 LT |
1295 | length = -EINVAL; |
1296 | if (sscanf(page, "%d", &new_value) != 1) | |
1297 | goto out; | |
1298 | ||
b77a493b | 1299 | length = 0; |
0619f0f5 SS |
1300 | if (new_value && fsi->bool_pending_values) |
1301 | length = security_set_bools(fsi->state, fsi->bool_num, | |
1302 | fsi->bool_pending_values); | |
1da177e4 | 1303 | |
b77a493b EP |
1304 | if (!length) |
1305 | length = count; | |
1da177e4 LT |
1306 | |
1307 | out: | |
0619f0f5 | 1308 | mutex_unlock(&fsi->mutex); |
8365a719 | 1309 | kfree(page); |
1da177e4 LT |
1310 | return length; |
1311 | } | |
1312 | ||
9c2e08c5 | 1313 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1314 | .write = sel_commit_bools_write, |
57a62c23 | 1315 | .llseek = generic_file_llseek, |
1da177e4 LT |
1316 | }; |
1317 | ||
0c92d7c7 | 1318 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1319 | { |
ad52184b AV |
1320 | d_genocide(de); |
1321 | shrink_dcache_parent(de); | |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | #define BOOL_DIR_NAME "booleans" | |
1325 | ||
0619f0f5 | 1326 | static int sel_make_bools(struct selinux_fs_info *fsi) |
1da177e4 | 1327 | { |
b77a493b | 1328 | int i, ret; |
1da177e4 LT |
1329 | ssize_t len; |
1330 | struct dentry *dentry = NULL; | |
0619f0f5 | 1331 | struct dentry *dir = fsi->bool_dir; |
1da177e4 LT |
1332 | struct inode *inode = NULL; |
1333 | struct inode_security_struct *isec; | |
1334 | char **names = NULL, *page; | |
1335 | int num; | |
1336 | int *values = NULL; | |
1337 | u32 sid; | |
1338 | ||
1339 | /* remove any existing files */ | |
0619f0f5 SS |
1340 | for (i = 0; i < fsi->bool_num; i++) |
1341 | kfree(fsi->bool_pending_names[i]); | |
1342 | kfree(fsi->bool_pending_names); | |
1343 | kfree(fsi->bool_pending_values); | |
1344 | fsi->bool_num = 0; | |
1345 | fsi->bool_pending_names = NULL; | |
1346 | fsi->bool_pending_values = NULL; | |
1da177e4 | 1347 | |
0c92d7c7 | 1348 | sel_remove_entries(dir); |
1da177e4 | 1349 | |
b77a493b | 1350 | ret = -ENOMEM; |
1872981b EP |
1351 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1352 | if (!page) | |
b77a493b | 1353 | goto out; |
1da177e4 | 1354 | |
0619f0f5 | 1355 | ret = security_get_bools(fsi->state, &num, &names, &values); |
b77a493b | 1356 | if (ret) |
1da177e4 LT |
1357 | goto out; |
1358 | ||
1359 | for (i = 0; i < num; i++) { | |
b77a493b | 1360 | ret = -ENOMEM; |
1da177e4 | 1361 | dentry = d_alloc_name(dir, names[i]); |
b77a493b EP |
1362 | if (!dentry) |
1363 | goto out; | |
1364 | ||
1365 | ret = -ENOMEM; | |
1da177e4 | 1366 | inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
7e4237fa | 1367 | if (!inode) { |
1368 | dput(dentry); | |
b77a493b | 1369 | goto out; |
7e4237fa | 1370 | } |
1da177e4 | 1371 | |
b77a493b | 1372 | ret = -ENAMETOOLONG; |
cc1dad71 | 1373 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
7e4237fa | 1374 | if (len >= PAGE_SIZE) { |
1375 | dput(dentry); | |
1376 | iput(inode); | |
b77a493b | 1377 | goto out; |
7e4237fa | 1378 | } |
b77a493b | 1379 | |
80788c22 | 1380 | isec = selinux_inode(inode); |
0619f0f5 | 1381 | ret = security_genfs_sid(fsi->state, "selinuxfs", page, |
aa8e712c | 1382 | SECCLASS_FILE, &sid); |
4262fb51 | 1383 | if (ret) { |
900fde06 GT |
1384 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1385 | page); | |
1386 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1387 | } |
1388 | ||
1da177e4 | 1389 | isec->sid = sid; |
42059112 | 1390 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1391 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1392 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1393 | d_add(dentry, inode); |
1394 | } | |
0619f0f5 SS |
1395 | fsi->bool_num = num; |
1396 | fsi->bool_pending_names = names; | |
1397 | fsi->bool_pending_values = values; | |
b77a493b EP |
1398 | |
1399 | free_page((unsigned long)page); | |
1400 | return 0; | |
1da177e4 LT |
1401 | out: |
1402 | free_page((unsigned long)page); | |
b77a493b | 1403 | |
1da177e4 | 1404 | if (names) { |
9a5f04bf JJ |
1405 | for (i = 0; i < num; i++) |
1406 | kfree(names[i]); | |
1da177e4 LT |
1407 | kfree(names); |
1408 | } | |
20c19e41 | 1409 | kfree(values); |
0c92d7c7 | 1410 | sel_remove_entries(dir); |
b77a493b EP |
1411 | |
1412 | return ret; | |
1da177e4 LT |
1413 | } |
1414 | ||
1da177e4 LT |
1415 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
1416 | size_t count, loff_t *ppos) | |
1417 | { | |
6b6bc620 SS |
1418 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1419 | struct selinux_state *state = fsi->state; | |
1da177e4 LT |
1420 | char tmpbuf[TMPBUFLEN]; |
1421 | ssize_t length; | |
1422 | ||
6b6bc620 SS |
1423 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
1424 | avc_get_cache_threshold(state->avc)); | |
1da177e4 LT |
1425 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1426 | } | |
1427 | ||
1872981b EP |
1428 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1429 | const char __user *buf, | |
1da177e4 LT |
1430 | size_t count, loff_t *ppos) |
1431 | ||
1432 | { | |
6b6bc620 SS |
1433 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1434 | struct selinux_state *state = fsi->state; | |
8365a719 | 1435 | char *page; |
1da177e4 | 1436 | ssize_t ret; |
309c5fad | 1437 | unsigned int new_value; |
1da177e4 | 1438 | |
6b6bc620 SS |
1439 | ret = avc_has_perm(&selinux_state, |
1440 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1441 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, |
1442 | NULL); | |
b77a493b | 1443 | if (ret) |
8365a719 | 1444 | return ret; |
1da177e4 | 1445 | |
b77a493b | 1446 | if (count >= PAGE_SIZE) |
8365a719 | 1447 | return -ENOMEM; |
1da177e4 | 1448 | |
b77a493b | 1449 | /* No partial writes. */ |
b77a493b | 1450 | if (*ppos != 0) |
8365a719 | 1451 | return -EINVAL; |
1da177e4 | 1452 | |
8365a719 AV |
1453 | page = memdup_user_nul(buf, count); |
1454 | if (IS_ERR(page)) | |
1455 | return PTR_ERR(page); | |
1da177e4 | 1456 | |
b77a493b EP |
1457 | ret = -EINVAL; |
1458 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1459 | goto out; |
1da177e4 | 1460 | |
6b6bc620 | 1461 | avc_set_cache_threshold(state->avc, new_value); |
b77a493b | 1462 | |
1da177e4 | 1463 | ret = count; |
1da177e4 | 1464 | out: |
8365a719 | 1465 | kfree(page); |
1da177e4 LT |
1466 | return ret; |
1467 | } | |
1468 | ||
1469 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1470 | size_t count, loff_t *ppos) | |
1471 | { | |
6b6bc620 SS |
1472 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1473 | struct selinux_state *state = fsi->state; | |
1da177e4 | 1474 | char *page; |
b77a493b | 1475 | ssize_t length; |
1da177e4 LT |
1476 | |
1477 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1478 | if (!page) |
1479 | return -ENOMEM; | |
1480 | ||
6b6bc620 | 1481 | length = avc_get_hash_stats(state->avc, page); |
b77a493b EP |
1482 | if (length >= 0) |
1483 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1484 | free_page((unsigned long)page); |
b77a493b EP |
1485 | |
1486 | return length; | |
1da177e4 LT |
1487 | } |
1488 | ||
9c2e08c5 | 1489 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1490 | .read = sel_read_avc_cache_threshold, |
1491 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1492 | .llseek = generic_file_llseek, |
1da177e4 LT |
1493 | }; |
1494 | ||
9c2e08c5 | 1495 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1496 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1497 | .llseek = generic_file_llseek, |
1da177e4 LT |
1498 | }; |
1499 | ||
1500 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1501 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1502 | { | |
1503 | int cpu; | |
1504 | ||
4f4b6c1a | 1505 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1506 | if (!cpu_possible(cpu)) |
1507 | continue; | |
1508 | *idx = cpu + 1; | |
1509 | return &per_cpu(avc_cache_stats, cpu); | |
1510 | } | |
1511 | return NULL; | |
1512 | } | |
1513 | ||
1514 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1515 | { | |
1516 | loff_t n = *pos - 1; | |
1517 | ||
1518 | if (*pos == 0) | |
1519 | return SEQ_START_TOKEN; | |
1520 | ||
1521 | return sel_avc_get_stat_idx(&n); | |
1522 | } | |
1523 | ||
1524 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1525 | { | |
1526 | return sel_avc_get_stat_idx(pos); | |
1527 | } | |
1528 | ||
1529 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1530 | { | |
1531 | struct avc_cache_stats *st = v; | |
1532 | ||
710a0647 ME |
1533 | if (v == SEQ_START_TOKEN) { |
1534 | seq_puts(seq, | |
1535 | "lookups hits misses allocations reclaims frees\n"); | |
1536 | } else { | |
257313b2 LT |
1537 | unsigned int lookups = st->lookups; |
1538 | unsigned int misses = st->misses; | |
1539 | unsigned int hits = lookups - misses; | |
1540 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1541 | hits, misses, st->allocations, | |
1da177e4 | 1542 | st->reclaims, st->frees); |
257313b2 | 1543 | } |
1da177e4 LT |
1544 | return 0; |
1545 | } | |
1546 | ||
1547 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1548 | { } | |
1549 | ||
1996a109 | 1550 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1551 | .start = sel_avc_stats_seq_start, |
1552 | .next = sel_avc_stats_seq_next, | |
1553 | .show = sel_avc_stats_seq_show, | |
1554 | .stop = sel_avc_stats_seq_stop, | |
1555 | }; | |
1556 | ||
1557 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1558 | { | |
1559 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1560 | } | |
1561 | ||
9c2e08c5 | 1562 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1563 | .open = sel_open_avc_cache_stats, |
1564 | .read = seq_read, | |
1565 | .llseek = seq_lseek, | |
1566 | .release = seq_release, | |
1567 | }; | |
1568 | #endif | |
1569 | ||
1570 | static int sel_make_avc_files(struct dentry *dir) | |
1571 | { | |
0619f0f5 SS |
1572 | struct super_block *sb = dir->d_sb; |
1573 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
b77a493b | 1574 | int i; |
cda37124 | 1575 | static const struct tree_descr files[] = { |
1da177e4 LT |
1576 | { "cache_threshold", |
1577 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1578 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1579 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1580 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1581 | #endif | |
1582 | }; | |
1583 | ||
6e20a64a | 1584 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1585 | struct inode *inode; |
1586 | struct dentry *dentry; | |
1587 | ||
1588 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1589 | if (!dentry) |
1590 | return -ENOMEM; | |
1da177e4 LT |
1591 | |
1592 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
7e4237fa | 1593 | if (!inode) { |
1594 | dput(dentry); | |
b77a493b | 1595 | return -ENOMEM; |
7e4237fa | 1596 | } |
b77a493b | 1597 | |
1da177e4 | 1598 | inode->i_fop = files[i].ops; |
0619f0f5 | 1599 | inode->i_ino = ++fsi->last_ino; |
1da177e4 LT |
1600 | d_add(dentry, inode); |
1601 | } | |
b77a493b EP |
1602 | |
1603 | return 0; | |
1da177e4 LT |
1604 | } |
1605 | ||
1872981b | 1606 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1607 | size_t count, loff_t *ppos) |
1608 | { | |
0619f0f5 | 1609 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
f0ee2e46 JC |
1610 | char *con; |
1611 | u32 sid, len; | |
1612 | ssize_t ret; | |
1613 | ||
496ad9aa | 1614 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
0619f0f5 | 1615 | ret = security_sid_to_context(fsi->state, sid, &con, &len); |
b77a493b | 1616 | if (ret) |
f0ee2e46 JC |
1617 | return ret; |
1618 | ||
1619 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1620 | kfree(con); | |
1621 | return ret; | |
1622 | } | |
1623 | ||
1624 | static const struct file_operations sel_initcon_ops = { | |
1625 | .read = sel_read_initcon, | |
57a62c23 | 1626 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1627 | }; |
1628 | ||
1629 | static int sel_make_initcon_files(struct dentry *dir) | |
1630 | { | |
b77a493b | 1631 | int i; |
f0ee2e46 JC |
1632 | |
1633 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1634 | struct inode *inode; | |
1635 | struct dentry *dentry; | |
1636 | dentry = d_alloc_name(dir, security_get_initial_sid_context(i)); | |
b77a493b EP |
1637 | if (!dentry) |
1638 | return -ENOMEM; | |
f0ee2e46 JC |
1639 | |
1640 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1641 | if (!inode) { |
1642 | dput(dentry); | |
b77a493b | 1643 | return -ENOMEM; |
7e4237fa | 1644 | } |
b77a493b | 1645 | |
f0ee2e46 JC |
1646 | inode->i_fop = &sel_initcon_ops; |
1647 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1648 | d_add(dentry, inode); | |
1649 | } | |
b77a493b EP |
1650 | |
1651 | return 0; | |
f0ee2e46 JC |
1652 | } |
1653 | ||
e47c8fc5 CP |
1654 | static inline unsigned long sel_class_to_ino(u16 class) |
1655 | { | |
1656 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1657 | } | |
1658 | ||
1659 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1660 | { | |
92ae9e82 | 1661 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1662 | } |
1663 | ||
1664 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1665 | { | |
1666 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1667 | } | |
1668 | ||
1669 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1670 | { | |
1671 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1672 | } | |
1673 | ||
1872981b | 1674 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1675 | size_t count, loff_t *ppos) |
1676 | { | |
496ad9aa | 1677 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1678 | char res[TMPBUFLEN]; |
1679 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); | |
1680 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1681 | } |
1682 | ||
1683 | static const struct file_operations sel_class_ops = { | |
1684 | .read = sel_read_class, | |
57a62c23 | 1685 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1686 | }; |
1687 | ||
1872981b | 1688 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1689 | size_t count, loff_t *ppos) |
1690 | { | |
496ad9aa | 1691 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 AV |
1692 | char res[TMPBUFLEN]; |
1693 | ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); | |
1694 | return simple_read_from_buffer(buf, count, ppos, res, len); | |
e47c8fc5 CP |
1695 | } |
1696 | ||
1697 | static const struct file_operations sel_perm_ops = { | |
1698 | .read = sel_read_perm, | |
57a62c23 | 1699 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1700 | }; |
1701 | ||
3bb56b25 PM |
1702 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1703 | size_t count, loff_t *ppos) | |
1704 | { | |
0619f0f5 | 1705 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
3bb56b25 PM |
1706 | int value; |
1707 | char tmpbuf[TMPBUFLEN]; | |
1708 | ssize_t length; | |
496ad9aa | 1709 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 | 1710 | |
0619f0f5 | 1711 | value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK); |
3bb56b25 PM |
1712 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); |
1713 | ||
1714 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1715 | } | |
1716 | ||
1717 | static const struct file_operations sel_policycap_ops = { | |
1718 | .read = sel_read_policycap, | |
57a62c23 | 1719 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1720 | }; |
1721 | ||
e47c8fc5 CP |
1722 | static int sel_make_perm_files(char *objclass, int classvalue, |
1723 | struct dentry *dir) | |
1724 | { | |
0619f0f5 | 1725 | struct selinux_fs_info *fsi = dir->d_sb->s_fs_info; |
b77a493b | 1726 | int i, rc, nperms; |
e47c8fc5 CP |
1727 | char **perms; |
1728 | ||
0619f0f5 | 1729 | rc = security_get_permissions(fsi->state, objclass, &perms, &nperms); |
e47c8fc5 | 1730 | if (rc) |
b77a493b | 1731 | return rc; |
e47c8fc5 CP |
1732 | |
1733 | for (i = 0; i < nperms; i++) { | |
1734 | struct inode *inode; | |
1735 | struct dentry *dentry; | |
1736 | ||
b77a493b | 1737 | rc = -ENOMEM; |
e47c8fc5 | 1738 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1739 | if (!dentry) |
1740 | goto out; | |
e47c8fc5 | 1741 | |
b77a493b | 1742 | rc = -ENOMEM; |
e47c8fc5 | 1743 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
7e4237fa | 1744 | if (!inode) { |
1745 | dput(dentry); | |
b77a493b | 1746 | goto out; |
7e4237fa | 1747 | } |
b77a493b | 1748 | |
e47c8fc5 CP |
1749 | inode->i_fop = &sel_perm_ops; |
1750 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1751 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1752 | d_add(dentry, inode); |
1753 | } | |
b77a493b EP |
1754 | rc = 0; |
1755 | out: | |
e47c8fc5 CP |
1756 | for (i = 0; i < nperms; i++) |
1757 | kfree(perms[i]); | |
1758 | kfree(perms); | |
e47c8fc5 CP |
1759 | return rc; |
1760 | } | |
1761 | ||
1762 | static int sel_make_class_dir_entries(char *classname, int index, | |
1763 | struct dentry *dir) | |
1764 | { | |
0619f0f5 SS |
1765 | struct super_block *sb = dir->d_sb; |
1766 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
e47c8fc5 CP |
1767 | struct dentry *dentry = NULL; |
1768 | struct inode *inode = NULL; | |
1769 | int rc; | |
1770 | ||
1771 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1772 | if (!dentry) |
1773 | return -ENOMEM; | |
e47c8fc5 CP |
1774 | |
1775 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1776 | if (!inode) { |
1777 | dput(dentry); | |
b77a493b | 1778 | return -ENOMEM; |
7e4237fa | 1779 | } |
e47c8fc5 CP |
1780 | |
1781 | inode->i_fop = &sel_class_ops; | |
1782 | inode->i_ino = sel_class_to_ino(index); | |
1783 | d_add(dentry, inode); | |
1784 | ||
0619f0f5 | 1785 | dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); |
a1c2aa1e AV |
1786 | if (IS_ERR(dentry)) |
1787 | return PTR_ERR(dentry); | |
e47c8fc5 CP |
1788 | |
1789 | rc = sel_make_perm_files(classname, index, dentry); | |
1790 | ||
e47c8fc5 CP |
1791 | return rc; |
1792 | } | |
1793 | ||
0619f0f5 | 1794 | static int sel_make_classes(struct selinux_fs_info *fsi) |
e47c8fc5 | 1795 | { |
0619f0f5 | 1796 | |
b77a493b | 1797 | int rc, nclasses, i; |
e47c8fc5 CP |
1798 | char **classes; |
1799 | ||
1800 | /* delete any existing entries */ | |
0619f0f5 | 1801 | sel_remove_entries(fsi->class_dir); |
e47c8fc5 | 1802 | |
0619f0f5 | 1803 | rc = security_get_classes(fsi->state, &classes, &nclasses); |
b77a493b EP |
1804 | if (rc) |
1805 | return rc; | |
e47c8fc5 CP |
1806 | |
1807 | /* +2 since classes are 1-indexed */ | |
0619f0f5 | 1808 | fsi->last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1809 | |
1810 | for (i = 0; i < nclasses; i++) { | |
1811 | struct dentry *class_name_dir; | |
1812 | ||
0619f0f5 SS |
1813 | class_name_dir = sel_make_dir(fsi->class_dir, classes[i], |
1814 | &fsi->last_class_ino); | |
a1c2aa1e AV |
1815 | if (IS_ERR(class_name_dir)) { |
1816 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1817 | goto out; |
a1c2aa1e | 1818 | } |
e47c8fc5 CP |
1819 | |
1820 | /* i+1 since class values are 1-indexed */ | |
c1a7368a | 1821 | rc = sel_make_class_dir_entries(classes[i], i + 1, |
e47c8fc5 CP |
1822 | class_name_dir); |
1823 | if (rc) | |
b77a493b | 1824 | goto out; |
e47c8fc5 | 1825 | } |
b77a493b EP |
1826 | rc = 0; |
1827 | out: | |
e47c8fc5 CP |
1828 | for (i = 0; i < nclasses; i++) |
1829 | kfree(classes[i]); | |
1830 | kfree(classes); | |
e47c8fc5 CP |
1831 | return rc; |
1832 | } | |
1833 | ||
0619f0f5 | 1834 | static int sel_make_policycap(struct selinux_fs_info *fsi) |
3bb56b25 PM |
1835 | { |
1836 | unsigned int iter; | |
1837 | struct dentry *dentry = NULL; | |
1838 | struct inode *inode = NULL; | |
1839 | ||
0619f0f5 | 1840 | sel_remove_entries(fsi->policycap_dir); |
3bb56b25 PM |
1841 | |
1842 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { | |
4dc2fce3 | 1843 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
0619f0f5 | 1844 | dentry = d_alloc_name(fsi->policycap_dir, |
4dc2fce3 | 1845 | selinux_policycap_names[iter]); |
3bb56b25 | 1846 | else |
0619f0f5 | 1847 | dentry = d_alloc_name(fsi->policycap_dir, "unknown"); |
3bb56b25 PM |
1848 | |
1849 | if (dentry == NULL) | |
1850 | return -ENOMEM; | |
1851 | ||
0619f0f5 | 1852 | inode = sel_make_inode(fsi->sb, S_IFREG | 0444); |
7e4237fa | 1853 | if (inode == NULL) { |
1854 | dput(dentry); | |
3bb56b25 | 1855 | return -ENOMEM; |
7e4237fa | 1856 | } |
3bb56b25 PM |
1857 | |
1858 | inode->i_fop = &sel_policycap_ops; | |
1859 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
1860 | d_add(dentry, inode); | |
1861 | } | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
a1c2aa1e | 1866 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 1867 | unsigned long *ino) |
1da177e4 | 1868 | { |
a1c2aa1e | 1869 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
1870 | struct inode *inode; |
1871 | ||
a1c2aa1e AV |
1872 | if (!dentry) |
1873 | return ERR_PTR(-ENOMEM); | |
1874 | ||
1875 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
1876 | if (!inode) { | |
1877 | dput(dentry); | |
1878 | return ERR_PTR(-ENOMEM); | |
1879 | } | |
b77a493b | 1880 | |
1da177e4 LT |
1881 | inode->i_op = &simple_dir_inode_operations; |
1882 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 1883 | inode->i_ino = ++(*ino); |
40e906f8 | 1884 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 1885 | inc_nlink(inode); |
1da177e4 | 1886 | d_add(dentry, inode); |
edb20fb5 | 1887 | /* bump link count on parent directory, too */ |
ce0b16dd | 1888 | inc_nlink(d_inode(dir)); |
b77a493b | 1889 | |
a1c2aa1e | 1890 | return dentry; |
1da177e4 LT |
1891 | } |
1892 | ||
0619f0f5 SS |
1893 | #define NULL_FILE_NAME "null" |
1894 | ||
920f50b2 | 1895 | static int sel_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 1896 | { |
0619f0f5 | 1897 | struct selinux_fs_info *fsi; |
1da177e4 LT |
1898 | int ret; |
1899 | struct dentry *dentry; | |
a1c2aa1e | 1900 | struct inode *inode; |
1da177e4 LT |
1901 | struct inode_security_struct *isec; |
1902 | ||
cda37124 | 1903 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
1904 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
1905 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 1906 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
1907 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
1908 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1909 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1910 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1911 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
1912 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
1913 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
1914 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
1915 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
1916 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
1917 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
1918 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 1919 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 1920 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
1921 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
1922 | S_IWUGO}, | |
1da177e4 LT |
1923 | /* last one */ {""} |
1924 | }; | |
0619f0f5 SS |
1925 | |
1926 | ret = selinux_fs_info_create(sb); | |
1927 | if (ret) | |
1928 | goto err; | |
1929 | ||
1da177e4 LT |
1930 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
1931 | if (ret) | |
161ce45a | 1932 | goto err; |
1da177e4 | 1933 | |
0619f0f5 SS |
1934 | fsi = sb->s_fs_info; |
1935 | fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); | |
1936 | if (IS_ERR(fsi->bool_dir)) { | |
1937 | ret = PTR_ERR(fsi->bool_dir); | |
1938 | fsi->bool_dir = NULL; | |
161ce45a | 1939 | goto err; |
a1c2aa1e | 1940 | } |
1da177e4 | 1941 | |
b77a493b | 1942 | ret = -ENOMEM; |
1da177e4 | 1943 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 1944 | if (!dentry) |
161ce45a | 1945 | goto err; |
1da177e4 | 1946 | |
b77a493b | 1947 | ret = -ENOMEM; |
1da177e4 | 1948 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
7e4237fa | 1949 | if (!inode) { |
1950 | dput(dentry); | |
161ce45a | 1951 | goto err; |
7e4237fa | 1952 | } |
b77a493b | 1953 | |
0619f0f5 | 1954 | inode->i_ino = ++fsi->last_ino; |
80788c22 | 1955 | isec = selinux_inode(inode); |
1da177e4 LT |
1956 | isec->sid = SECINITSID_DEVNULL; |
1957 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 1958 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
1959 | |
1960 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
1961 | d_add(dentry, inode); | |
1da177e4 | 1962 | |
0619f0f5 | 1963 | dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); |
a1c2aa1e AV |
1964 | if (IS_ERR(dentry)) { |
1965 | ret = PTR_ERR(dentry); | |
161ce45a | 1966 | goto err; |
a1c2aa1e | 1967 | } |
1da177e4 LT |
1968 | |
1969 | ret = sel_make_avc_files(dentry); | |
1970 | if (ret) | |
161ce45a | 1971 | goto err; |
f0ee2e46 | 1972 | |
0619f0f5 | 1973 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); |
a1c2aa1e AV |
1974 | if (IS_ERR(dentry)) { |
1975 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 1976 | goto err; |
a1c2aa1e | 1977 | } |
f0ee2e46 JC |
1978 | |
1979 | ret = sel_make_initcon_files(dentry); | |
1980 | if (ret) | |
1981 | goto err; | |
1982 | ||
0619f0f5 SS |
1983 | fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino); |
1984 | if (IS_ERR(fsi->class_dir)) { | |
1985 | ret = PTR_ERR(fsi->class_dir); | |
1986 | fsi->class_dir = NULL; | |
3bb56b25 | 1987 | goto err; |
a1c2aa1e | 1988 | } |
3bb56b25 | 1989 | |
0619f0f5 SS |
1990 | fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", |
1991 | &fsi->last_ino); | |
1992 | if (IS_ERR(fsi->policycap_dir)) { | |
1993 | ret = PTR_ERR(fsi->policycap_dir); | |
1994 | fsi->policycap_dir = NULL; | |
3bb56b25 | 1995 | goto err; |
a1c2aa1e | 1996 | } |
0619f0f5 SS |
1997 | |
1998 | ret = sel_make_policy_nodes(fsi); | |
1999 | if (ret) | |
2000 | goto err; | |
b77a493b | 2001 | return 0; |
161ce45a | 2002 | err: |
f8b69a5f | 2003 | pr_err("SELinux: %s: failed while creating inodes\n", |
744ba35e | 2004 | __func__); |
0619f0f5 SS |
2005 | |
2006 | selinux_fs_info_free(sb); | |
2007 | ||
b77a493b | 2008 | return ret; |
1da177e4 LT |
2009 | } |
2010 | ||
920f50b2 | 2011 | static int sel_get_tree(struct fs_context *fc) |
1da177e4 | 2012 | { |
920f50b2 DH |
2013 | return get_tree_single(fc, sel_fill_super); |
2014 | } | |
2015 | ||
2016 | static const struct fs_context_operations sel_context_ops = { | |
2017 | .get_tree = sel_get_tree, | |
2018 | }; | |
2019 | ||
2020 | static int sel_init_fs_context(struct fs_context *fc) | |
2021 | { | |
2022 | fc->ops = &sel_context_ops; | |
2023 | return 0; | |
1da177e4 LT |
2024 | } |
2025 | ||
0619f0f5 SS |
2026 | static void sel_kill_sb(struct super_block *sb) |
2027 | { | |
2028 | selinux_fs_info_free(sb); | |
2029 | kill_litter_super(sb); | |
2030 | } | |
2031 | ||
1da177e4 LT |
2032 | static struct file_system_type sel_fs_type = { |
2033 | .name = "selinuxfs", | |
920f50b2 | 2034 | .init_fs_context = sel_init_fs_context, |
0619f0f5 | 2035 | .kill_sb = sel_kill_sb, |
1da177e4 LT |
2036 | }; |
2037 | ||
2038 | struct vfsmount *selinuxfs_mount; | |
0619f0f5 | 2039 | struct path selinux_null; |
1da177e4 LT |
2040 | |
2041 | static int __init init_sel_fs(void) | |
2042 | { | |
0619f0f5 SS |
2043 | struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, |
2044 | sizeof(NULL_FILE_NAME)-1); | |
1da177e4 LT |
2045 | int err; |
2046 | ||
2047 | if (!selinux_enabled) | |
2048 | return 0; | |
7a627e3b | 2049 | |
f9bb4882 EB |
2050 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
2051 | if (err) | |
2052 | return err; | |
7a627e3b | 2053 | |
1da177e4 | 2054 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 2055 | if (err) { |
f9bb4882 | 2056 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 2057 | return err; |
7a627e3b | 2058 | } |
b77a493b | 2059 | |
765927b2 | 2060 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b | 2061 | if (IS_ERR(selinuxfs_mount)) { |
f8b69a5f | 2062 | pr_err("selinuxfs: could not mount!\n"); |
b77a493b EP |
2063 | err = PTR_ERR(selinuxfs_mount); |
2064 | selinuxfs_mount = NULL; | |
1da177e4 | 2065 | } |
0619f0f5 SS |
2066 | selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, |
2067 | &null_name); | |
2068 | if (IS_ERR(selinux_null.dentry)) { | |
2069 | pr_err("selinuxfs: could not lookup null!\n"); | |
2070 | err = PTR_ERR(selinux_null.dentry); | |
2071 | selinux_null.dentry = NULL; | |
2072 | } | |
b77a493b | 2073 | |
1da177e4 LT |
2074 | return err; |
2075 | } | |
2076 | ||
2077 | __initcall(init_sel_fs); | |
2078 | ||
2079 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
2080 | void exit_sel_fs(void) | |
2081 | { | |
f9bb4882 | 2082 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
fd40ffc7 | 2083 | dput(selinux_null.dentry); |
423e0ab0 | 2084 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
2085 | unregister_filesystem(&sel_fs_type); |
2086 | } | |
2087 | #endif |