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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
3 | * | |
1872981b | 4 | * Added conditional policy language extensions |
1da177e4 | 5 | * |
82c21bfa | 6 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
3bb56b25 | 7 | * |
1872981b | 8 | * Added support for the policy capability bitmap |
3bb56b25 PM |
9 | * |
10 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
11 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
12 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
1da177e4 LT |
13 | */ |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/fs.h> | |
920f50b2 | 20 | #include <linux/fs_context.h> |
0619f0f5 | 21 | #include <linux/mount.h> |
bb003079 | 22 | #include <linux/mutex.h> |
0eea6091 | 23 | #include <linux/namei.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/major.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/percpu.h> | |
af601e46 | 30 | #include <linux/audit.h> |
f5269710 | 31 | #include <linux/uaccess.h> |
7a627e3b | 32 | #include <linux/kobject.h> |
0f7e4c33 | 33 | #include <linux/ctype.h> |
1da177e4 LT |
34 | |
35 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
36 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
37 | ||
38 | #include "flask.h" | |
39 | #include "avc.h" | |
40 | #include "avc_ss.h" | |
41 | #include "security.h" | |
42 | #include "objsec.h" | |
43 | #include "conditional.h" | |
44 | ||
1da177e4 LT |
45 | enum sel_inos { |
46 | SEL_ROOT_INO = 2, | |
47 | SEL_LOAD, /* load policy */ | |
48 | SEL_ENFORCE, /* get or set enforcing status */ | |
49 | SEL_CONTEXT, /* validate context */ | |
50 | SEL_ACCESS, /* compute access decision */ | |
51 | SEL_CREATE, /* compute create labeling decision */ | |
52 | SEL_RELABEL, /* compute relabeling decision */ | |
53 | SEL_USER, /* compute reachable user contexts */ | |
54 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
55 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
56 | SEL_MLS, /* return if MLS policy is enabled */ | |
57 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
58 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
59 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 60 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
61 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
62 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 63 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 64 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 65 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 66 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
67 | }; |
68 | ||
0619f0f5 SS |
69 | struct selinux_fs_info { |
70 | struct dentry *bool_dir; | |
71 | unsigned int bool_num; | |
72 | char **bool_pending_names; | |
73 | unsigned int *bool_pending_values; | |
74 | struct dentry *class_dir; | |
75 | unsigned long last_class_ino; | |
76 | bool policy_opened; | |
77 | struct dentry *policycap_dir; | |
0619f0f5 SS |
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 | ||
0619f0f5 SS |
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 | |
613ba187 DB |
119 | #define BOOL_DIR_NAME "booleans" |
120 | #define CLASS_DIR_NAME "class" | |
121 | #define POLICYCAP_DIR_NAME "policy_capabilities" | |
122 | ||
1da177e4 LT |
123 | #define TMPBUFLEN 12 |
124 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
125 | size_t count, loff_t *ppos) | |
126 | { | |
0619f0f5 | 127 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
128 | char tmpbuf[TMPBUFLEN]; |
129 | ssize_t length; | |
130 | ||
aa8e712c | 131 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 132 | enforcing_enabled(fsi->state)); |
1da177e4 LT |
133 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
134 | } | |
135 | ||
136 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 137 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
138 | size_t count, loff_t *ppos) |
139 | ||
140 | { | |
0619f0f5 SS |
141 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
142 | struct selinux_state *state = fsi->state; | |
b77a493b | 143 | char *page = NULL; |
1da177e4 | 144 | ssize_t length; |
aa8e712c | 145 | int old_value, new_value; |
1da177e4 | 146 | |
bfd51626 | 147 | if (count >= PAGE_SIZE) |
8365a719 | 148 | return -ENOMEM; |
b77a493b EP |
149 | |
150 | /* No partial writes. */ | |
b77a493b | 151 | if (*ppos != 0) |
8365a719 | 152 | return -EINVAL; |
b77a493b | 153 | |
8365a719 AV |
154 | page = memdup_user_nul(buf, count); |
155 | if (IS_ERR(page)) | |
156 | return PTR_ERR(page); | |
1da177e4 LT |
157 | |
158 | length = -EINVAL; | |
159 | if (sscanf(page, "%d", &new_value) != 1) | |
160 | goto out; | |
161 | ||
ea49d10e SS |
162 | new_value = !!new_value; |
163 | ||
0619f0f5 | 164 | old_value = enforcing_enabled(state); |
aa8e712c | 165 | if (new_value != old_value) { |
6b6bc620 SS |
166 | length = avc_has_perm(&selinux_state, |
167 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
168 | SECCLASS_SECURITY, SECURITY__SETENFORCE, |
169 | NULL); | |
1da177e4 LT |
170 | if (length) |
171 | goto out; | |
cdfb6b34 | 172 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 | 173 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
6c5a682e | 174 | " enabled=1 old-enabled=1 lsm=selinux res=1", |
aa8e712c | 175 | new_value, old_value, |
581abc09 | 176 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
6c5a682e | 177 | audit_get_sessionid(current)); |
0619f0f5 | 178 | enforcing_set(state, new_value); |
aa8e712c | 179 | if (new_value) |
6b6bc620 | 180 | avc_ss_reset(state->avc, 0); |
aa8e712c | 181 | selnl_notify_setenforce(new_value); |
0619f0f5 | 182 | selinux_status_update_setenforce(state, new_value); |
aa8e712c | 183 | if (!new_value) |
42df744c | 184 | call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL); |
1da177e4 LT |
185 | } |
186 | length = count; | |
187 | out: | |
8365a719 | 188 | kfree(page); |
1da177e4 LT |
189 | return length; |
190 | } | |
191 | #else | |
192 | #define sel_write_enforce NULL | |
193 | #endif | |
194 | ||
9c2e08c5 | 195 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
196 | .read = sel_read_enforce, |
197 | .write = sel_write_enforce, | |
57a62c23 | 198 | .llseek = generic_file_llseek, |
1da177e4 LT |
199 | }; |
200 | ||
3f12070e EP |
201 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
202 | size_t count, loff_t *ppos) | |
203 | { | |
0619f0f5 SS |
204 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
205 | struct selinux_state *state = fsi->state; | |
3f12070e EP |
206 | char tmpbuf[TMPBUFLEN]; |
207 | ssize_t length; | |
496ad9aa | 208 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e | 209 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
0619f0f5 SS |
210 | security_get_reject_unknown(state) : |
211 | !security_get_allow_unknown(state); | |
3f12070e EP |
212 | |
213 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
214 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
215 | } | |
216 | ||
217 | static const struct file_operations sel_handle_unknown_ops = { | |
218 | .read = sel_read_handle_unknown, | |
57a62c23 | 219 | .llseek = generic_file_llseek, |
3f12070e EP |
220 | }; |
221 | ||
11904167 KK |
222 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
223 | { | |
0619f0f5 SS |
224 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
225 | struct page *status = selinux_kernel_status_page(fsi->state); | |
11904167 KK |
226 | |
227 | if (!status) | |
228 | return -ENOMEM; | |
229 | ||
230 | filp->private_data = status; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
236 | size_t count, loff_t *ppos) | |
237 | { | |
238 | struct page *status = filp->private_data; | |
239 | ||
240 | BUG_ON(!status); | |
241 | ||
242 | return simple_read_from_buffer(buf, count, ppos, | |
243 | page_address(status), | |
244 | sizeof(struct selinux_kernel_status)); | |
245 | } | |
246 | ||
247 | static int sel_mmap_handle_status(struct file *filp, | |
248 | struct vm_area_struct *vma) | |
249 | { | |
250 | struct page *status = filp->private_data; | |
251 | unsigned long size = vma->vm_end - vma->vm_start; | |
252 | ||
253 | BUG_ON(!status); | |
254 | ||
255 | /* only allows one page from the head */ | |
256 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
257 | return -EIO; | |
258 | /* disallow writable mapping */ | |
259 | if (vma->vm_flags & VM_WRITE) | |
260 | return -EPERM; | |
261 | /* disallow mprotect() turns it into writable */ | |
262 | vma->vm_flags &= ~VM_MAYWRITE; | |
263 | ||
264 | return remap_pfn_range(vma, vma->vm_start, | |
265 | page_to_pfn(status), | |
266 | size, vma->vm_page_prot); | |
267 | } | |
268 | ||
269 | static const struct file_operations sel_handle_status_ops = { | |
270 | .open = sel_open_handle_status, | |
271 | .read = sel_read_handle_status, | |
272 | .mmap = sel_mmap_handle_status, | |
273 | .llseek = generic_file_llseek, | |
274 | }; | |
275 | ||
1da177e4 | 276 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 277 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
278 | size_t count, loff_t *ppos) |
279 | ||
280 | { | |
0619f0f5 | 281 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 282 | char *page; |
1da177e4 LT |
283 | ssize_t length; |
284 | int new_value; | |
4195ed42 | 285 | int enforcing; |
1da177e4 | 286 | |
89b223bf PM |
287 | /* NOTE: we are now officially considering runtime disable as |
288 | * deprecated, and using it will become increasingly painful | |
289 | * (e.g. sleeping/blocking) as we progress through future | |
290 | * kernel releases until eventually it is removed | |
291 | */ | |
292 | pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n"); | |
293 | ||
bfd51626 | 294 | if (count >= PAGE_SIZE) |
8365a719 | 295 | return -ENOMEM; |
b77a493b EP |
296 | |
297 | /* No partial writes. */ | |
b77a493b | 298 | if (*ppos != 0) |
8365a719 | 299 | return -EINVAL; |
b77a493b | 300 | |
8365a719 AV |
301 | page = memdup_user_nul(buf, count); |
302 | if (IS_ERR(page)) | |
303 | return PTR_ERR(page); | |
1da177e4 LT |
304 | |
305 | length = -EINVAL; | |
306 | if (sscanf(page, "%d", &new_value) != 1) | |
307 | goto out; | |
308 | ||
309 | if (new_value) { | |
4195ed42 | 310 | enforcing = enforcing_enabled(fsi->state); |
0619f0f5 | 311 | length = selinux_disable(fsi->state); |
b77a493b | 312 | if (length) |
1da177e4 | 313 | goto out; |
cdfb6b34 | 314 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 | 315 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
6c5a682e | 316 | " enabled=0 old-enabled=1 lsm=selinux res=1", |
4195ed42 | 317 | enforcing, enforcing, |
581abc09 | 318 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
6c5a682e | 319 | audit_get_sessionid(current)); |
1da177e4 LT |
320 | } |
321 | ||
322 | length = count; | |
323 | out: | |
8365a719 | 324 | kfree(page); |
1da177e4 LT |
325 | return length; |
326 | } | |
327 | #else | |
328 | #define sel_write_disable NULL | |
329 | #endif | |
330 | ||
9c2e08c5 | 331 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 332 | .write = sel_write_disable, |
57a62c23 | 333 | .llseek = generic_file_llseek, |
1da177e4 LT |
334 | }; |
335 | ||
336 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 337 | size_t count, loff_t *ppos) |
1da177e4 LT |
338 | { |
339 | char tmpbuf[TMPBUFLEN]; | |
340 | ssize_t length; | |
341 | ||
342 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
343 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
344 | } | |
345 | ||
9c2e08c5 | 346 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 347 | .read = sel_read_policyvers, |
57a62c23 | 348 | .llseek = generic_file_llseek, |
1da177e4 LT |
349 | }; |
350 | ||
351 | /* declaration for sel_write_load */ | |
66ec384a DB |
352 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
353 | unsigned int *bool_num, char ***bool_pending_names, | |
354 | unsigned int **bool_pending_values); | |
355 | static int sel_make_classes(struct selinux_policy *newpolicy, | |
356 | struct dentry *class_dir, | |
357 | unsigned long *last_class_ino); | |
e47c8fc5 CP |
358 | |
359 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 360 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 361 | unsigned long *ino); |
1da177e4 | 362 | |
0eea6091 DB |
363 | /* declaration for sel_make_policy_nodes */ |
364 | static struct dentry *sel_make_disconnected_dir(struct super_block *sb, | |
365 | unsigned long *ino); | |
366 | ||
367 | /* declaration for sel_make_policy_nodes */ | |
aeecf4a3 DB |
368 | static void sel_remove_entries(struct dentry *de); |
369 | ||
1da177e4 LT |
370 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, |
371 | size_t count, loff_t *ppos) | |
372 | { | |
0619f0f5 | 373 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
374 | char tmpbuf[TMPBUFLEN]; |
375 | ssize_t length; | |
376 | ||
0719aaf5 | 377 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 378 | security_mls_enabled(fsi->state)); |
1da177e4 LT |
379 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
380 | } | |
381 | ||
9c2e08c5 | 382 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 383 | .read = sel_read_mls, |
57a62c23 | 384 | .llseek = generic_file_llseek, |
1da177e4 LT |
385 | }; |
386 | ||
cee74f47 EP |
387 | struct policy_load_memory { |
388 | size_t len; | |
389 | void *data; | |
390 | }; | |
391 | ||
392 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
393 | { | |
0619f0f5 SS |
394 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
395 | struct selinux_state *state = fsi->state; | |
cee74f47 EP |
396 | struct policy_load_memory *plm = NULL; |
397 | int rc; | |
398 | ||
399 | BUG_ON(filp->private_data); | |
400 | ||
9ff9abc4 | 401 | mutex_lock(&fsi->state->policy_mutex); |
cee74f47 | 402 | |
6b6bc620 SS |
403 | rc = avc_has_perm(&selinux_state, |
404 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 405 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 EP |
406 | if (rc) |
407 | goto err; | |
408 | ||
409 | rc = -EBUSY; | |
0619f0f5 | 410 | if (fsi->policy_opened) |
cee74f47 EP |
411 | goto err; |
412 | ||
413 | rc = -ENOMEM; | |
414 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
415 | if (!plm) | |
416 | goto err; | |
417 | ||
0619f0f5 | 418 | rc = security_read_policy(state, &plm->data, &plm->len); |
cee74f47 EP |
419 | if (rc) |
420 | goto err; | |
421 | ||
66ccd256 OM |
422 | if ((size_t)i_size_read(inode) != plm->len) { |
423 | inode_lock(inode); | |
424 | i_size_write(inode, plm->len); | |
425 | inode_unlock(inode); | |
426 | } | |
427 | ||
0619f0f5 | 428 | fsi->policy_opened = 1; |
cee74f47 EP |
429 | |
430 | filp->private_data = plm; | |
431 | ||
9ff9abc4 | 432 | mutex_unlock(&fsi->state->policy_mutex); |
cee74f47 EP |
433 | |
434 | return 0; | |
435 | err: | |
9ff9abc4 | 436 | mutex_unlock(&fsi->state->policy_mutex); |
cee74f47 EP |
437 | |
438 | if (plm) | |
439 | vfree(plm->data); | |
440 | kfree(plm); | |
441 | return rc; | |
442 | } | |
443 | ||
444 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
445 | { | |
0619f0f5 | 446 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
447 | struct policy_load_memory *plm = filp->private_data; |
448 | ||
449 | BUG_ON(!plm); | |
450 | ||
0619f0f5 | 451 | fsi->policy_opened = 0; |
cee74f47 EP |
452 | |
453 | vfree(plm->data); | |
454 | kfree(plm); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
460 | size_t count, loff_t *ppos) | |
461 | { | |
462 | struct policy_load_memory *plm = filp->private_data; | |
463 | int ret; | |
464 | ||
6b6bc620 SS |
465 | ret = avc_has_perm(&selinux_state, |
466 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 467 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 | 468 | if (ret) |
0da74120 | 469 | return ret; |
cee74f47 | 470 | |
0da74120 | 471 | return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); |
cee74f47 EP |
472 | } |
473 | ||
ac9a1f6d | 474 | static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 475 | { |
11bac800 | 476 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
477 | unsigned long offset; |
478 | struct page *page; | |
479 | ||
480 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
481 | return VM_FAULT_SIGBUS; | |
482 | ||
483 | offset = vmf->pgoff << PAGE_SHIFT; | |
484 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
485 | return VM_FAULT_SIGBUS; | |
486 | ||
487 | page = vmalloc_to_page(plm->data + offset); | |
488 | get_page(page); | |
489 | ||
490 | vmf->page = page; | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
7cbea8dc | 495 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
496 | .fault = sel_mmap_policy_fault, |
497 | .page_mkwrite = sel_mmap_policy_fault, | |
498 | }; | |
499 | ||
ad3fa08c | 500 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
501 | { |
502 | if (vma->vm_flags & VM_SHARED) { | |
503 | /* do not allow mprotect to make mapping writable */ | |
504 | vma->vm_flags &= ~VM_MAYWRITE; | |
505 | ||
506 | if (vma->vm_flags & VM_WRITE) | |
507 | return -EACCES; | |
508 | } | |
509 | ||
314e51b9 | 510 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
511 | vma->vm_ops = &sel_mmap_policy_ops; |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
cee74f47 EP |
516 | static const struct file_operations sel_policy_ops = { |
517 | .open = sel_open_policy, | |
518 | .read = sel_read_policy, | |
845ca30f | 519 | .mmap = sel_mmap_policy, |
cee74f47 | 520 | .release = sel_release_policy, |
47a93a5b | 521 | .llseek = generic_file_llseek, |
cee74f47 EP |
522 | }; |
523 | ||
0eea6091 DB |
524 | static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names, |
525 | unsigned int *bool_values) | |
aeecf4a3 DB |
526 | { |
527 | u32 i; | |
528 | ||
529 | /* bool_dir cleanup */ | |
0eea6091 DB |
530 | for (i = 0; i < bool_num; i++) |
531 | kfree(bool_names[i]); | |
532 | kfree(bool_names); | |
533 | kfree(bool_values); | |
aeecf4a3 DB |
534 | } |
535 | ||
02a52c5c SS |
536 | static int sel_make_policy_nodes(struct selinux_fs_info *fsi, |
537 | struct selinux_policy *newpolicy) | |
0619f0f5 | 538 | { |
0eea6091 DB |
539 | int ret = 0; |
540 | struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry; | |
541 | unsigned int tmp_bool_num, old_bool_num; | |
542 | char **tmp_bool_names, **old_bool_names; | |
543 | unsigned int *tmp_bool_values, *old_bool_values; | |
544 | unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */ | |
545 | ||
546 | tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino); | |
547 | if (IS_ERR(tmp_parent)) | |
548 | return PTR_ERR(tmp_parent); | |
549 | ||
550 | tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ | |
551 | tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino); | |
552 | if (IS_ERR(tmp_bool_dir)) { | |
553 | ret = PTR_ERR(tmp_bool_dir); | |
554 | goto out; | |
555 | } | |
0619f0f5 | 556 | |
0eea6091 DB |
557 | tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ |
558 | tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino); | |
559 | if (IS_ERR(tmp_class_dir)) { | |
560 | ret = PTR_ERR(tmp_class_dir); | |
561 | goto out; | |
562 | } | |
aeecf4a3 | 563 | |
0eea6091 DB |
564 | ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num, |
565 | &tmp_bool_names, &tmp_bool_values); | |
0619f0f5 SS |
566 | if (ret) { |
567 | pr_err("SELinux: failed to load policy booleans\n"); | |
0eea6091 | 568 | goto out; |
0619f0f5 SS |
569 | } |
570 | ||
0eea6091 | 571 | ret = sel_make_classes(newpolicy, tmp_class_dir, |
66ec384a | 572 | &fsi->last_class_ino); |
0619f0f5 SS |
573 | if (ret) { |
574 | pr_err("SELinux: failed to load policy classes\n"); | |
0eea6091 | 575 | goto out; |
0619f0f5 SS |
576 | } |
577 | ||
0eea6091 DB |
578 | /* booleans */ |
579 | old_dentry = fsi->bool_dir; | |
580 | lock_rename(tmp_bool_dir, old_dentry); | |
581 | d_exchange(tmp_bool_dir, fsi->bool_dir); | |
582 | ||
583 | old_bool_num = fsi->bool_num; | |
584 | old_bool_names = fsi->bool_pending_names; | |
585 | old_bool_values = fsi->bool_pending_values; | |
586 | ||
587 | fsi->bool_num = tmp_bool_num; | |
588 | fsi->bool_pending_names = tmp_bool_names; | |
589 | fsi->bool_pending_values = tmp_bool_values; | |
590 | ||
591 | sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values); | |
592 | ||
593 | fsi->bool_dir = tmp_bool_dir; | |
594 | unlock_rename(tmp_bool_dir, old_dentry); | |
595 | ||
596 | /* classes */ | |
597 | old_dentry = fsi->class_dir; | |
598 | lock_rename(tmp_class_dir, old_dentry); | |
599 | d_exchange(tmp_class_dir, fsi->class_dir); | |
600 | fsi->class_dir = tmp_class_dir; | |
601 | unlock_rename(tmp_class_dir, old_dentry); | |
602 | ||
603 | out: | |
604 | /* Since the other temporary dirs are children of tmp_parent | |
605 | * this will handle all the cleanup in the case of a failure before | |
606 | * the swapover | |
607 | */ | |
608 | sel_remove_entries(tmp_parent); | |
609 | dput(tmp_parent); /* d_genocide() only handles the children */ | |
610 | ||
611 | return ret; | |
0619f0f5 SS |
612 | } |
613 | ||
1872981b | 614 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
615 | size_t count, loff_t *ppos) |
616 | ||
617 | { | |
0619f0f5 | 618 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
6c6a27ae | 619 | struct selinux_load_state load_state; |
1da177e4 LT |
620 | ssize_t length; |
621 | void *data = NULL; | |
622 | ||
9ff9abc4 | 623 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 624 | |
6b6bc620 SS |
625 | length = avc_has_perm(&selinux_state, |
626 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 627 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); |
1da177e4 LT |
628 | if (length) |
629 | goto out; | |
630 | ||
b77a493b EP |
631 | /* No partial writes. */ |
632 | length = -EINVAL; | |
633 | if (*ppos != 0) | |
1da177e4 | 634 | goto out; |
1da177e4 | 635 | |
b77a493b EP |
636 | length = -ENOMEM; |
637 | data = vmalloc(count); | |
638 | if (!data) | |
1da177e4 | 639 | goto out; |
1da177e4 LT |
640 | |
641 | length = -EFAULT; | |
642 | if (copy_from_user(data, buf, count) != 0) | |
643 | goto out; | |
644 | ||
6c6a27ae | 645 | length = security_load_policy(fsi->state, data, count, &load_state); |
4262fb51 GT |
646 | if (length) { |
647 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 648 | goto out; |
4262fb51 | 649 | } |
1da177e4 | 650 | |
6c6a27ae | 651 | length = sel_make_policy_nodes(fsi, load_state.policy); |
02a52c5c | 652 | if (length) { |
6c6a27ae | 653 | selinux_policy_cancel(fsi->state, &load_state); |
bc7c0453 | 654 | goto out; |
02a52c5c SS |
655 | } |
656 | ||
6c6a27ae | 657 | selinux_policy_commit(fsi->state, &load_state); |
b77a493b EP |
658 | |
659 | length = count; | |
e47c8fc5 | 660 | |
cdfb6b34 | 661 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
d141136f | 662 | "auid=%u ses=%u lsm=selinux res=1", |
581abc09 | 663 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 664 | audit_get_sessionid(current)); |
1da177e4 | 665 | out: |
9ff9abc4 | 666 | mutex_unlock(&fsi->state->policy_mutex); |
1da177e4 LT |
667 | vfree(data); |
668 | return length; | |
669 | } | |
670 | ||
9c2e08c5 | 671 | static const struct file_operations sel_load_ops = { |
1da177e4 | 672 | .write = sel_write_load, |
57a62c23 | 673 | .llseek = generic_file_llseek, |
1da177e4 LT |
674 | }; |
675 | ||
1872981b | 676 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 677 | { |
0619f0f5 SS |
678 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
679 | struct selinux_state *state = fsi->state; | |
b77a493b | 680 | char *canon = NULL; |
ce9982d0 | 681 | u32 sid, len; |
1da177e4 LT |
682 | ssize_t length; |
683 | ||
6b6bc620 SS |
684 | length = avc_has_perm(&selinux_state, |
685 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 686 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); |
1da177e4 | 687 | if (length) |
b77a493b | 688 | goto out; |
1da177e4 | 689 | |
0619f0f5 | 690 | length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
691 | if (length) |
692 | goto out; | |
1da177e4 | 693 | |
0619f0f5 | 694 | length = security_sid_to_context(state, sid, &canon, &len); |
b77a493b EP |
695 | if (length) |
696 | goto out; | |
ce9982d0 | 697 | |
b77a493b | 698 | length = -ERANGE; |
ce9982d0 | 699 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 700 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 701 | "payload max\n", __func__, len); |
1da177e4 | 702 | goto out; |
ce9982d0 | 703 | } |
1da177e4 | 704 | |
ce9982d0 SS |
705 | memcpy(buf, canon, len); |
706 | length = len; | |
1da177e4 | 707 | out: |
ce9982d0 | 708 | kfree(canon); |
1da177e4 LT |
709 | return length; |
710 | } | |
711 | ||
1da177e4 LT |
712 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
713 | size_t count, loff_t *ppos) | |
714 | { | |
0619f0f5 | 715 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
716 | char tmpbuf[TMPBUFLEN]; |
717 | ssize_t length; | |
718 | ||
8861d0af LR |
719 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
720 | checkreqprot_get(fsi->state)); | |
1da177e4 LT |
721 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
722 | } | |
723 | ||
1872981b | 724 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
725 | size_t count, loff_t *ppos) |
726 | { | |
0619f0f5 | 727 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 728 | char *page; |
1da177e4 LT |
729 | ssize_t length; |
730 | unsigned int new_value; | |
731 | ||
6b6bc620 SS |
732 | length = avc_has_perm(&selinux_state, |
733 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
734 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, |
735 | NULL); | |
1da177e4 | 736 | if (length) |
8365a719 | 737 | return length; |
1da177e4 | 738 | |
bfd51626 | 739 | if (count >= PAGE_SIZE) |
8365a719 | 740 | return -ENOMEM; |
b77a493b EP |
741 | |
742 | /* No partial writes. */ | |
b77a493b | 743 | if (*ppos != 0) |
8365a719 | 744 | return -EINVAL; |
b77a493b | 745 | |
8365a719 AV |
746 | page = memdup_user_nul(buf, count); |
747 | if (IS_ERR(page)) | |
748 | return PTR_ERR(page); | |
1da177e4 LT |
749 | |
750 | length = -EINVAL; | |
751 | if (sscanf(page, "%u", &new_value) != 1) | |
752 | goto out; | |
753 | ||
e9c38f9f SS |
754 | if (new_value) { |
755 | char comm[sizeof(current->comm)]; | |
756 | ||
757 | memcpy(comm, current->comm, sizeof(comm)); | |
758 | pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n", | |
759 | comm, current->pid); | |
760 | } | |
761 | ||
8861d0af | 762 | checkreqprot_set(fsi->state, (new_value ? 1 : 0)); |
1da177e4 LT |
763 | length = count; |
764 | out: | |
8365a719 | 765 | kfree(page); |
1da177e4 LT |
766 | return length; |
767 | } | |
9c2e08c5 | 768 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
769 | .read = sel_read_checkreqprot, |
770 | .write = sel_write_checkreqprot, | |
57a62c23 | 771 | .llseek = generic_file_llseek, |
1da177e4 LT |
772 | }; |
773 | ||
f9df6458 AP |
774 | static ssize_t sel_write_validatetrans(struct file *file, |
775 | const char __user *buf, | |
776 | size_t count, loff_t *ppos) | |
777 | { | |
0619f0f5 SS |
778 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
779 | struct selinux_state *state = fsi->state; | |
f9df6458 AP |
780 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; |
781 | char *req = NULL; | |
782 | u32 osid, nsid, tsid; | |
783 | u16 tclass; | |
784 | int rc; | |
785 | ||
6b6bc620 SS |
786 | rc = avc_has_perm(&selinux_state, |
787 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 788 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); |
f9df6458 AP |
789 | if (rc) |
790 | goto out; | |
791 | ||
792 | rc = -ENOMEM; | |
793 | if (count >= PAGE_SIZE) | |
794 | goto out; | |
795 | ||
796 | /* No partial writes. */ | |
797 | rc = -EINVAL; | |
798 | if (*ppos != 0) | |
799 | goto out; | |
800 | ||
0b884d25 AV |
801 | req = memdup_user_nul(buf, count); |
802 | if (IS_ERR(req)) { | |
803 | rc = PTR_ERR(req); | |
804 | req = NULL; | |
f9df6458 | 805 | goto out; |
0b884d25 | 806 | } |
f9df6458 AP |
807 | |
808 | rc = -ENOMEM; | |
809 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
810 | if (!oldcon) | |
811 | goto out; | |
812 | ||
813 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
814 | if (!newcon) | |
815 | goto out; | |
816 | ||
817 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
818 | if (!taskcon) | |
819 | goto out; | |
820 | ||
821 | rc = -EINVAL; | |
822 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
823 | goto out; | |
824 | ||
0619f0f5 | 825 | rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL); |
f9df6458 AP |
826 | if (rc) |
827 | goto out; | |
828 | ||
0619f0f5 | 829 | rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL); |
f9df6458 AP |
830 | if (rc) |
831 | goto out; | |
832 | ||
0619f0f5 | 833 | rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL); |
f9df6458 AP |
834 | if (rc) |
835 | goto out; | |
836 | ||
0619f0f5 | 837 | rc = security_validate_transition_user(state, osid, nsid, tsid, tclass); |
f9df6458 AP |
838 | if (!rc) |
839 | rc = count; | |
840 | out: | |
841 | kfree(req); | |
842 | kfree(oldcon); | |
843 | kfree(newcon); | |
844 | kfree(taskcon); | |
845 | return rc; | |
846 | } | |
847 | ||
848 | static const struct file_operations sel_transition_ops = { | |
849 | .write = sel_write_validatetrans, | |
850 | .llseek = generic_file_llseek, | |
851 | }; | |
852 | ||
1da177e4 LT |
853 | /* |
854 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
855 | */ | |
1872981b EP |
856 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
857 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
858 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
859 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
860 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 | 861 | |
631d2b49 | 862 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
1da177e4 LT |
863 | [SEL_ACCESS] = sel_write_access, |
864 | [SEL_CREATE] = sel_write_create, | |
865 | [SEL_RELABEL] = sel_write_relabel, | |
866 | [SEL_USER] = sel_write_user, | |
867 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 868 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
869 | }; |
870 | ||
871 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
872 | { | |
496ad9aa | 873 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
874 | char *data; |
875 | ssize_t rv; | |
876 | ||
6e20a64a | 877 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
878 | return -EINVAL; |
879 | ||
880 | data = simple_transaction_get(file, buf, size); | |
881 | if (IS_ERR(data)) | |
882 | return PTR_ERR(data); | |
883 | ||
1872981b EP |
884 | rv = write_op[ino](file, data, size); |
885 | if (rv > 0) { | |
1da177e4 LT |
886 | simple_transaction_set(file, rv); |
887 | rv = size; | |
888 | } | |
889 | return rv; | |
890 | } | |
891 | ||
9c2e08c5 | 892 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
893 | .write = selinux_transaction_write, |
894 | .read = simple_transaction_read, | |
895 | .release = simple_transaction_release, | |
57a62c23 | 896 | .llseek = generic_file_llseek, |
1da177e4 LT |
897 | }; |
898 | ||
899 | /* | |
900 | * payload - write methods | |
901 | * If the method has a response, the response should be put in buf, | |
902 | * and the length returned. Otherwise return 0 or and -error. | |
903 | */ | |
904 | ||
1872981b | 905 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 906 | { |
0619f0f5 SS |
907 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
908 | struct selinux_state *state = fsi->state; | |
b77a493b | 909 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
910 | u32 ssid, tsid; |
911 | u16 tclass; | |
1da177e4 LT |
912 | struct av_decision avd; |
913 | ssize_t length; | |
914 | ||
6b6bc620 SS |
915 | length = avc_has_perm(&selinux_state, |
916 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 917 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); |
1da177e4 | 918 | if (length) |
b77a493b | 919 | goto out; |
1da177e4 LT |
920 | |
921 | length = -ENOMEM; | |
c1a7368a | 922 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 923 | if (!scon) |
b77a493b | 924 | goto out; |
1da177e4 | 925 | |
b77a493b | 926 | length = -ENOMEM; |
c1a7368a | 927 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
928 | if (!tcon) |
929 | goto out; | |
1da177e4 LT |
930 | |
931 | length = -EINVAL; | |
19439d05 | 932 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 933 | goto out; |
1da177e4 | 934 | |
0619f0f5 | 935 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
936 | if (length) |
937 | goto out; | |
938 | ||
0619f0f5 | 939 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
940 | if (length) |
941 | goto out; | |
1da177e4 | 942 | |
0619f0f5 | 943 | security_compute_av_user(state, ssid, tsid, tclass, &avd); |
1da177e4 LT |
944 | |
945 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 946 | "%x %x %x %x %u %x", |
f1c6381a | 947 | avd.allowed, 0xffffffff, |
1da177e4 | 948 | avd.auditallow, avd.auditdeny, |
8a6f83af | 949 | avd.seqno, avd.flags); |
1da177e4 | 950 | out: |
b77a493b | 951 | kfree(tcon); |
1da177e4 LT |
952 | kfree(scon); |
953 | return length; | |
954 | } | |
955 | ||
1872981b | 956 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 957 | { |
0619f0f5 SS |
958 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
959 | struct selinux_state *state = fsi->state; | |
b77a493b | 960 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 961 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
962 | u32 ssid, tsid, newsid; |
963 | u16 tclass; | |
964 | ssize_t length; | |
b77a493b | 965 | char *newcon = NULL; |
1da177e4 | 966 | u32 len; |
f50a3ec9 | 967 | int nargs; |
1da177e4 | 968 | |
6b6bc620 SS |
969 | length = avc_has_perm(&selinux_state, |
970 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
971 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, |
972 | NULL); | |
1da177e4 | 973 | if (length) |
b77a493b | 974 | goto out; |
1da177e4 LT |
975 | |
976 | length = -ENOMEM; | |
c1a7368a | 977 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 978 | if (!scon) |
b77a493b | 979 | goto out; |
1da177e4 | 980 | |
b77a493b | 981 | length = -ENOMEM; |
c1a7368a | 982 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
983 | if (!tcon) |
984 | goto out; | |
1da177e4 | 985 | |
f50a3ec9 KK |
986 | length = -ENOMEM; |
987 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
988 | if (!namebuf) | |
989 | goto out; | |
990 | ||
1da177e4 | 991 | length = -EINVAL; |
f50a3ec9 KK |
992 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
993 | if (nargs < 3 || nargs > 4) | |
b77a493b | 994 | goto out; |
0f7e4c33 KK |
995 | if (nargs == 4) { |
996 | /* | |
997 | * If and when the name of new object to be queried contains | |
998 | * either whitespace or multibyte characters, they shall be | |
999 | * encoded based on the percentage-encoding rule. | |
1000 | * If not encoded, the sscanf logic picks up only left-half | |
1001 | * of the supplied name; splitted by a whitespace unexpectedly. | |
1002 | */ | |
1003 | char *r, *w; | |
1004 | int c1, c2; | |
1005 | ||
1006 | r = w = namebuf; | |
1007 | do { | |
1008 | c1 = *r++; | |
1009 | if (c1 == '+') | |
1010 | c1 = ' '; | |
1011 | else if (c1 == '%') { | |
af7ff2c2 AS |
1012 | c1 = hex_to_bin(*r++); |
1013 | if (c1 < 0) | |
0f7e4c33 | 1014 | goto out; |
af7ff2c2 AS |
1015 | c2 = hex_to_bin(*r++); |
1016 | if (c2 < 0) | |
0f7e4c33 KK |
1017 | goto out; |
1018 | c1 = (c1 << 4) | c2; | |
1019 | } | |
1020 | *w++ = c1; | |
1021 | } while (c1 != '\0'); | |
1022 | ||
f50a3ec9 | 1023 | objname = namebuf; |
0f7e4c33 | 1024 | } |
1da177e4 | 1025 | |
0619f0f5 | 1026 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1027 | if (length) |
1028 | goto out; | |
1029 | ||
0619f0f5 | 1030 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1031 | if (length) |
1032 | goto out; | |
1da177e4 | 1033 | |
0619f0f5 SS |
1034 | length = security_transition_sid_user(state, ssid, tsid, tclass, |
1035 | objname, &newsid); | |
b77a493b EP |
1036 | if (length) |
1037 | goto out; | |
1da177e4 | 1038 | |
0619f0f5 | 1039 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1040 | if (length) |
1041 | goto out; | |
1da177e4 | 1042 | |
b77a493b | 1043 | length = -ERANGE; |
1da177e4 | 1044 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1045 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1046 | "payload max\n", __func__, len); |
b77a493b | 1047 | goto out; |
1da177e4 LT |
1048 | } |
1049 | ||
1050 | memcpy(buf, newcon, len); | |
1051 | length = len; | |
b77a493b | 1052 | out: |
1da177e4 | 1053 | kfree(newcon); |
f50a3ec9 | 1054 | kfree(namebuf); |
1da177e4 | 1055 | kfree(tcon); |
1da177e4 LT |
1056 | kfree(scon); |
1057 | return length; | |
1058 | } | |
1059 | ||
1872981b | 1060 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 1061 | { |
0619f0f5 SS |
1062 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1063 | struct selinux_state *state = fsi->state; | |
b77a493b | 1064 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1065 | u32 ssid, tsid, newsid; |
1066 | u16 tclass; | |
1067 | ssize_t length; | |
b77a493b | 1068 | char *newcon = NULL; |
1da177e4 LT |
1069 | u32 len; |
1070 | ||
6b6bc620 SS |
1071 | length = avc_has_perm(&selinux_state, |
1072 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1073 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, |
1074 | NULL); | |
1da177e4 | 1075 | if (length) |
b77a493b | 1076 | goto out; |
1da177e4 LT |
1077 | |
1078 | length = -ENOMEM; | |
c1a7368a | 1079 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1080 | if (!scon) |
b77a493b | 1081 | goto out; |
1da177e4 | 1082 | |
b77a493b | 1083 | length = -ENOMEM; |
c1a7368a | 1084 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1085 | if (!tcon) |
1086 | goto out; | |
1da177e4 LT |
1087 | |
1088 | length = -EINVAL; | |
1089 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1090 | goto out; |
1da177e4 | 1091 | |
0619f0f5 | 1092 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1093 | if (length) |
1094 | goto out; | |
1095 | ||
0619f0f5 | 1096 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1097 | if (length) |
1098 | goto out; | |
1da177e4 | 1099 | |
0619f0f5 | 1100 | length = security_change_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1101 | if (length) |
1102 | goto out; | |
1da177e4 | 1103 | |
0619f0f5 | 1104 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1105 | if (length) |
1106 | goto out; | |
1da177e4 | 1107 | |
b77a493b EP |
1108 | length = -ERANGE; |
1109 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
1110 | goto out; | |
1da177e4 LT |
1111 | |
1112 | memcpy(buf, newcon, len); | |
1113 | length = len; | |
b77a493b | 1114 | out: |
1da177e4 | 1115 | kfree(newcon); |
1da177e4 | 1116 | kfree(tcon); |
1da177e4 LT |
1117 | kfree(scon); |
1118 | return length; | |
1119 | } | |
1120 | ||
1872981b | 1121 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 1122 | { |
0619f0f5 SS |
1123 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1124 | struct selinux_state *state = fsi->state; | |
b77a493b EP |
1125 | char *con = NULL, *user = NULL, *ptr; |
1126 | u32 sid, *sids = NULL; | |
1da177e4 LT |
1127 | ssize_t length; |
1128 | char *newcon; | |
1129 | int i, rc; | |
1130 | u32 len, nsids; | |
1131 | ||
6b6bc620 SS |
1132 | length = avc_has_perm(&selinux_state, |
1133 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1134 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, |
1135 | NULL); | |
1da177e4 | 1136 | if (length) |
6eab04a8 | 1137 | goto out; |
1da177e4 LT |
1138 | |
1139 | length = -ENOMEM; | |
c1a7368a | 1140 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1141 | if (!con) |
6eab04a8 | 1142 | goto out; |
1da177e4 | 1143 | |
b77a493b | 1144 | length = -ENOMEM; |
c1a7368a | 1145 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1146 | if (!user) |
1147 | goto out; | |
1da177e4 LT |
1148 | |
1149 | length = -EINVAL; | |
1150 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 1151 | goto out; |
1da177e4 | 1152 | |
0619f0f5 | 1153 | length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL); |
b77a493b EP |
1154 | if (length) |
1155 | goto out; | |
1da177e4 | 1156 | |
0619f0f5 | 1157 | length = security_get_user_sids(state, sid, user, &sids, &nsids); |
b77a493b EP |
1158 | if (length) |
1159 | goto out; | |
1da177e4 LT |
1160 | |
1161 | length = sprintf(buf, "%u", nsids) + 1; | |
1162 | ptr = buf + length; | |
1163 | for (i = 0; i < nsids; i++) { | |
0619f0f5 | 1164 | rc = security_sid_to_context(state, sids[i], &newcon, &len); |
1da177e4 LT |
1165 | if (rc) { |
1166 | length = rc; | |
b77a493b | 1167 | goto out; |
1da177e4 LT |
1168 | } |
1169 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1170 | kfree(newcon); | |
1171 | length = -ERANGE; | |
b77a493b | 1172 | goto out; |
1da177e4 LT |
1173 | } |
1174 | memcpy(ptr, newcon, len); | |
1175 | kfree(newcon); | |
1176 | ptr += len; | |
1177 | length += len; | |
1178 | } | |
b77a493b | 1179 | out: |
1da177e4 | 1180 | kfree(sids); |
1da177e4 | 1181 | kfree(user); |
1da177e4 LT |
1182 | kfree(con); |
1183 | return length; | |
1184 | } | |
1185 | ||
1872981b | 1186 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1187 | { |
0619f0f5 SS |
1188 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1189 | struct selinux_state *state = fsi->state; | |
b77a493b | 1190 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1191 | u32 ssid, tsid, newsid; |
1192 | u16 tclass; | |
1193 | ssize_t length; | |
b77a493b | 1194 | char *newcon = NULL; |
1da177e4 LT |
1195 | u32 len; |
1196 | ||
6b6bc620 SS |
1197 | length = avc_has_perm(&selinux_state, |
1198 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1199 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, |
1200 | NULL); | |
1da177e4 | 1201 | if (length) |
b77a493b | 1202 | goto out; |
1da177e4 LT |
1203 | |
1204 | length = -ENOMEM; | |
c1a7368a | 1205 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1206 | if (!scon) |
6eab04a8 | 1207 | goto out; |
1da177e4 | 1208 | |
b77a493b | 1209 | length = -ENOMEM; |
c1a7368a | 1210 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1211 | if (!tcon) |
1212 | goto out; | |
1da177e4 LT |
1213 | |
1214 | length = -EINVAL; | |
1215 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1216 | goto out; |
1da177e4 | 1217 | |
0619f0f5 | 1218 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1219 | if (length) |
1220 | goto out; | |
1221 | ||
0619f0f5 | 1222 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1223 | if (length) |
1224 | goto out; | |
1da177e4 | 1225 | |
0619f0f5 | 1226 | length = security_member_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1227 | if (length) |
1228 | goto out; | |
1da177e4 | 1229 | |
0619f0f5 | 1230 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1231 | if (length) |
1232 | goto out; | |
1da177e4 | 1233 | |
b77a493b | 1234 | length = -ERANGE; |
1da177e4 | 1235 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1236 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1237 | "payload max\n", __func__, len); |
b77a493b | 1238 | goto out; |
1da177e4 LT |
1239 | } |
1240 | ||
1241 | memcpy(buf, newcon, len); | |
1242 | length = len; | |
b77a493b | 1243 | out: |
1da177e4 | 1244 | kfree(newcon); |
1da177e4 | 1245 | kfree(tcon); |
1da177e4 LT |
1246 | kfree(scon); |
1247 | return length; | |
1248 | } | |
1249 | ||
1250 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1251 | { | |
1252 | struct inode *ret = new_inode(sb); | |
1253 | ||
1254 | if (ret) { | |
1255 | ret->i_mode = mode; | |
078cd827 | 1256 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1257 | } |
1258 | return ret; | |
1259 | } | |
1260 | ||
1da177e4 LT |
1261 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1262 | size_t count, loff_t *ppos) | |
1263 | { | |
0619f0f5 | 1264 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 LT |
1265 | char *page = NULL; |
1266 | ssize_t length; | |
1da177e4 LT |
1267 | ssize_t ret; |
1268 | int cur_enforcing; | |
496ad9aa | 1269 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1270 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1271 | |
9ff9abc4 | 1272 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1273 | |
b77a493b | 1274 | ret = -EINVAL; |
0619f0f5 SS |
1275 | if (index >= fsi->bool_num || strcmp(name, |
1276 | fsi->bool_pending_names[index])) | |
0da74120 | 1277 | goto out_unlock; |
1da177e4 | 1278 | |
b77a493b | 1279 | ret = -ENOMEM; |
1872981b | 1280 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1281 | if (!page) |
0da74120 | 1282 | goto out_unlock; |
1da177e4 | 1283 | |
0619f0f5 | 1284 | cur_enforcing = security_get_bool_value(fsi->state, index); |
1da177e4 LT |
1285 | if (cur_enforcing < 0) { |
1286 | ret = cur_enforcing; | |
0da74120 | 1287 | goto out_unlock; |
1da177e4 | 1288 | } |
1da177e4 | 1289 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
0619f0f5 | 1290 | fsi->bool_pending_values[index]); |
9ff9abc4 | 1291 | mutex_unlock(&fsi->state->policy_mutex); |
0da74120 JH |
1292 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1293 | out_free: | |
b77a493b | 1294 | free_page((unsigned long)page); |
1da177e4 | 1295 | return ret; |
0da74120 JH |
1296 | |
1297 | out_unlock: | |
9ff9abc4 | 1298 | mutex_unlock(&fsi->state->policy_mutex); |
0da74120 | 1299 | goto out_free; |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1303 | size_t count, loff_t *ppos) | |
1304 | { | |
0619f0f5 | 1305 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1306 | char *page = NULL; |
d313f948 | 1307 | ssize_t length; |
1da177e4 | 1308 | int new_value; |
496ad9aa | 1309 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1310 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1311 | |
0da74120 JH |
1312 | if (count >= PAGE_SIZE) |
1313 | return -ENOMEM; | |
1314 | ||
1315 | /* No partial writes. */ | |
1316 | if (*ppos != 0) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | page = memdup_user_nul(buf, count); | |
1320 | if (IS_ERR(page)) | |
1321 | return PTR_ERR(page); | |
1322 | ||
9ff9abc4 | 1323 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1324 | |
6b6bc620 SS |
1325 | length = avc_has_perm(&selinux_state, |
1326 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1327 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1328 | NULL); | |
1da177e4 LT |
1329 | if (length) |
1330 | goto out; | |
1331 | ||
b77a493b | 1332 | length = -EINVAL; |
0619f0f5 SS |
1333 | if (index >= fsi->bool_num || strcmp(name, |
1334 | fsi->bool_pending_names[index])) | |
d313f948 | 1335 | goto out; |
d313f948 | 1336 | |
1da177e4 LT |
1337 | length = -EINVAL; |
1338 | if (sscanf(page, "%d", &new_value) != 1) | |
1339 | goto out; | |
1340 | ||
1341 | if (new_value) | |
1342 | new_value = 1; | |
1343 | ||
0619f0f5 | 1344 | fsi->bool_pending_values[index] = new_value; |
1da177e4 LT |
1345 | length = count; |
1346 | ||
1347 | out: | |
9ff9abc4 | 1348 | mutex_unlock(&fsi->state->policy_mutex); |
8365a719 | 1349 | kfree(page); |
1da177e4 LT |
1350 | return length; |
1351 | } | |
1352 | ||
9c2e08c5 | 1353 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1354 | .read = sel_read_bool, |
1355 | .write = sel_write_bool, | |
57a62c23 | 1356 | .llseek = generic_file_llseek, |
1da177e4 LT |
1357 | }; |
1358 | ||
1359 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1360 | const char __user *buf, | |
1361 | size_t count, loff_t *ppos) | |
1362 | { | |
0619f0f5 | 1363 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1364 | char *page = NULL; |
d313f948 | 1365 | ssize_t length; |
1da177e4 LT |
1366 | int new_value; |
1367 | ||
0da74120 JH |
1368 | if (count >= PAGE_SIZE) |
1369 | return -ENOMEM; | |
1370 | ||
1371 | /* No partial writes. */ | |
1372 | if (*ppos != 0) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | page = memdup_user_nul(buf, count); | |
1376 | if (IS_ERR(page)) | |
1377 | return PTR_ERR(page); | |
1378 | ||
9ff9abc4 | 1379 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1380 | |
6b6bc620 SS |
1381 | length = avc_has_perm(&selinux_state, |
1382 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1383 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1384 | NULL); | |
1da177e4 LT |
1385 | if (length) |
1386 | goto out; | |
1387 | ||
1da177e4 LT |
1388 | length = -EINVAL; |
1389 | if (sscanf(page, "%d", &new_value) != 1) | |
1390 | goto out; | |
1391 | ||
b77a493b | 1392 | length = 0; |
0619f0f5 SS |
1393 | if (new_value && fsi->bool_pending_values) |
1394 | length = security_set_bools(fsi->state, fsi->bool_num, | |
1395 | fsi->bool_pending_values); | |
1da177e4 | 1396 | |
b77a493b EP |
1397 | if (!length) |
1398 | length = count; | |
1da177e4 LT |
1399 | |
1400 | out: | |
9ff9abc4 | 1401 | mutex_unlock(&fsi->state->policy_mutex); |
8365a719 | 1402 | kfree(page); |
1da177e4 LT |
1403 | return length; |
1404 | } | |
1405 | ||
9c2e08c5 | 1406 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1407 | .write = sel_commit_bools_write, |
57a62c23 | 1408 | .llseek = generic_file_llseek, |
1da177e4 LT |
1409 | }; |
1410 | ||
0c92d7c7 | 1411 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1412 | { |
ad52184b AV |
1413 | d_genocide(de); |
1414 | shrink_dcache_parent(de); | |
1da177e4 LT |
1415 | } |
1416 | ||
66ec384a DB |
1417 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
1418 | unsigned int *bool_num, char ***bool_pending_names, | |
1419 | unsigned int **bool_pending_values) | |
1da177e4 | 1420 | { |
60abd318 | 1421 | int ret; |
1da177e4 LT |
1422 | ssize_t len; |
1423 | struct dentry *dentry = NULL; | |
1da177e4 LT |
1424 | struct inode *inode = NULL; |
1425 | struct inode_security_struct *isec; | |
1426 | char **names = NULL, *page; | |
60abd318 | 1427 | u32 i, num; |
1da177e4 LT |
1428 | int *values = NULL; |
1429 | u32 sid; | |
1430 | ||
b77a493b | 1431 | ret = -ENOMEM; |
1872981b EP |
1432 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1433 | if (!page) | |
b77a493b | 1434 | goto out; |
1da177e4 | 1435 | |
02a52c5c | 1436 | ret = security_get_bools(newpolicy, &num, &names, &values); |
b77a493b | 1437 | if (ret) |
1da177e4 LT |
1438 | goto out; |
1439 | ||
1440 | for (i = 0; i < num; i++) { | |
b77a493b | 1441 | ret = -ENOMEM; |
66ec384a | 1442 | dentry = d_alloc_name(bool_dir, names[i]); |
b77a493b EP |
1443 | if (!dentry) |
1444 | goto out; | |
1445 | ||
1446 | ret = -ENOMEM; | |
66ec384a | 1447 | inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
7e4237fa | 1448 | if (!inode) { |
1449 | dput(dentry); | |
b77a493b | 1450 | goto out; |
7e4237fa | 1451 | } |
1da177e4 | 1452 | |
b77a493b | 1453 | ret = -ENAMETOOLONG; |
cc1dad71 | 1454 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
7e4237fa | 1455 | if (len >= PAGE_SIZE) { |
1456 | dput(dentry); | |
1457 | iput(inode); | |
b77a493b | 1458 | goto out; |
7e4237fa | 1459 | } |
b77a493b | 1460 | |
80788c22 | 1461 | isec = selinux_inode(inode); |
02a52c5c | 1462 | ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page, |
aa8e712c | 1463 | SECCLASS_FILE, &sid); |
4262fb51 | 1464 | if (ret) { |
900fde06 GT |
1465 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1466 | page); | |
1467 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1468 | } |
1469 | ||
1da177e4 | 1470 | isec->sid = sid; |
42059112 | 1471 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1472 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1473 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1474 | d_add(dentry, inode); |
1475 | } | |
66ec384a DB |
1476 | *bool_num = num; |
1477 | *bool_pending_names = names; | |
1478 | *bool_pending_values = values; | |
b77a493b EP |
1479 | |
1480 | free_page((unsigned long)page); | |
1481 | return 0; | |
1da177e4 LT |
1482 | out: |
1483 | free_page((unsigned long)page); | |
b77a493b | 1484 | |
1da177e4 | 1485 | if (names) { |
9a5f04bf JJ |
1486 | for (i = 0; i < num; i++) |
1487 | kfree(names[i]); | |
1da177e4 LT |
1488 | kfree(names); |
1489 | } | |
20c19e41 | 1490 | kfree(values); |
66ec384a | 1491 | sel_remove_entries(bool_dir); |
b77a493b EP |
1492 | |
1493 | return ret; | |
1da177e4 LT |
1494 | } |
1495 | ||
1da177e4 LT |
1496 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
1497 | size_t count, loff_t *ppos) | |
1498 | { | |
6b6bc620 SS |
1499 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1500 | struct selinux_state *state = fsi->state; | |
1da177e4 LT |
1501 | char tmpbuf[TMPBUFLEN]; |
1502 | ssize_t length; | |
1503 | ||
6b6bc620 SS |
1504 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
1505 | avc_get_cache_threshold(state->avc)); | |
1da177e4 LT |
1506 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1507 | } | |
1508 | ||
1872981b EP |
1509 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1510 | const char __user *buf, | |
1da177e4 LT |
1511 | size_t count, loff_t *ppos) |
1512 | ||
1513 | { | |
6b6bc620 SS |
1514 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1515 | struct selinux_state *state = fsi->state; | |
8365a719 | 1516 | char *page; |
1da177e4 | 1517 | ssize_t ret; |
309c5fad | 1518 | unsigned int new_value; |
1da177e4 | 1519 | |
6b6bc620 SS |
1520 | ret = avc_has_perm(&selinux_state, |
1521 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1522 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, |
1523 | NULL); | |
b77a493b | 1524 | if (ret) |
8365a719 | 1525 | return ret; |
1da177e4 | 1526 | |
b77a493b | 1527 | if (count >= PAGE_SIZE) |
8365a719 | 1528 | return -ENOMEM; |
1da177e4 | 1529 | |
b77a493b | 1530 | /* No partial writes. */ |
b77a493b | 1531 | if (*ppos != 0) |
8365a719 | 1532 | return -EINVAL; |
1da177e4 | 1533 | |
8365a719 AV |
1534 | page = memdup_user_nul(buf, count); |
1535 | if (IS_ERR(page)) | |
1536 | return PTR_ERR(page); | |
1da177e4 | 1537 | |
b77a493b EP |
1538 | ret = -EINVAL; |
1539 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1540 | goto out; |
1da177e4 | 1541 | |
6b6bc620 | 1542 | avc_set_cache_threshold(state->avc, new_value); |
b77a493b | 1543 | |
1da177e4 | 1544 | ret = count; |
1da177e4 | 1545 | out: |
8365a719 | 1546 | kfree(page); |
1da177e4 LT |
1547 | return ret; |
1548 | } | |
1549 | ||
1550 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1551 | size_t count, loff_t *ppos) | |
1552 | { | |
6b6bc620 SS |
1553 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1554 | struct selinux_state *state = fsi->state; | |
1da177e4 | 1555 | char *page; |
b77a493b | 1556 | ssize_t length; |
1da177e4 LT |
1557 | |
1558 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1559 | if (!page) |
1560 | return -ENOMEM; | |
1561 | ||
6b6bc620 | 1562 | length = avc_get_hash_stats(state->avc, page); |
b77a493b EP |
1563 | if (length >= 0) |
1564 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1565 | free_page((unsigned long)page); |
b77a493b EP |
1566 | |
1567 | return length; | |
1da177e4 LT |
1568 | } |
1569 | ||
66f8e2f0 JVS |
1570 | static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf, |
1571 | size_t count, loff_t *ppos) | |
1572 | { | |
1573 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; | |
1574 | struct selinux_state *state = fsi->state; | |
1575 | char *page; | |
1576 | ssize_t length; | |
1577 | ||
1578 | page = (char *)__get_free_page(GFP_KERNEL); | |
1579 | if (!page) | |
1580 | return -ENOMEM; | |
1581 | ||
1582 | length = security_sidtab_hash_stats(state, page); | |
1583 | if (length >= 0) | |
1584 | length = simple_read_from_buffer(buf, count, ppos, page, | |
1585 | length); | |
1586 | free_page((unsigned long)page); | |
1587 | ||
1588 | return length; | |
1589 | } | |
1590 | ||
1591 | static const struct file_operations sel_sidtab_hash_stats_ops = { | |
1592 | .read = sel_read_sidtab_hash_stats, | |
1593 | .llseek = generic_file_llseek, | |
1594 | }; | |
1595 | ||
9c2e08c5 | 1596 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1597 | .read = sel_read_avc_cache_threshold, |
1598 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1599 | .llseek = generic_file_llseek, |
1da177e4 LT |
1600 | }; |
1601 | ||
9c2e08c5 | 1602 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1603 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1604 | .llseek = generic_file_llseek, |
1da177e4 LT |
1605 | }; |
1606 | ||
1607 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1608 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1609 | { | |
1610 | int cpu; | |
1611 | ||
4f4b6c1a | 1612 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1613 | if (!cpu_possible(cpu)) |
1614 | continue; | |
1615 | *idx = cpu + 1; | |
1616 | return &per_cpu(avc_cache_stats, cpu); | |
1617 | } | |
8d269a8e | 1618 | (*idx)++; |
1da177e4 LT |
1619 | return NULL; |
1620 | } | |
1621 | ||
1622 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1623 | { | |
1624 | loff_t n = *pos - 1; | |
1625 | ||
1626 | if (*pos == 0) | |
1627 | return SEQ_START_TOKEN; | |
1628 | ||
1629 | return sel_avc_get_stat_idx(&n); | |
1630 | } | |
1631 | ||
1632 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1633 | { | |
1634 | return sel_avc_get_stat_idx(pos); | |
1635 | } | |
1636 | ||
1637 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1638 | { | |
1639 | struct avc_cache_stats *st = v; | |
1640 | ||
710a0647 ME |
1641 | if (v == SEQ_START_TOKEN) { |
1642 | seq_puts(seq, | |
1643 | "lookups hits misses allocations reclaims frees\n"); | |
1644 | } else { | |
257313b2 LT |
1645 | unsigned int lookups = st->lookups; |
1646 | unsigned int misses = st->misses; | |
1647 | unsigned int hits = lookups - misses; | |
1648 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1649 | hits, misses, st->allocations, | |
1da177e4 | 1650 | st->reclaims, st->frees); |
257313b2 | 1651 | } |
1da177e4 LT |
1652 | return 0; |
1653 | } | |
1654 | ||
1655 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1656 | { } | |
1657 | ||
1996a109 | 1658 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1659 | .start = sel_avc_stats_seq_start, |
1660 | .next = sel_avc_stats_seq_next, | |
1661 | .show = sel_avc_stats_seq_show, | |
1662 | .stop = sel_avc_stats_seq_stop, | |
1663 | }; | |
1664 | ||
1665 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1666 | { | |
1667 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1668 | } | |
1669 | ||
9c2e08c5 | 1670 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1671 | .open = sel_open_avc_cache_stats, |
1672 | .read = seq_read, | |
1673 | .llseek = seq_lseek, | |
1674 | .release = seq_release, | |
1675 | }; | |
1676 | #endif | |
1677 | ||
1678 | static int sel_make_avc_files(struct dentry *dir) | |
1679 | { | |
0619f0f5 SS |
1680 | struct super_block *sb = dir->d_sb; |
1681 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
b77a493b | 1682 | int i; |
cda37124 | 1683 | static const struct tree_descr files[] = { |
1da177e4 LT |
1684 | { "cache_threshold", |
1685 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1686 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1687 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1688 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1689 | #endif | |
1690 | }; | |
1691 | ||
6e20a64a | 1692 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1693 | struct inode *inode; |
1694 | struct dentry *dentry; | |
1695 | ||
1696 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1697 | if (!dentry) |
1698 | return -ENOMEM; | |
1da177e4 LT |
1699 | |
1700 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
7e4237fa | 1701 | if (!inode) { |
1702 | dput(dentry); | |
b77a493b | 1703 | return -ENOMEM; |
7e4237fa | 1704 | } |
b77a493b | 1705 | |
1da177e4 | 1706 | inode->i_fop = files[i].ops; |
0619f0f5 | 1707 | inode->i_ino = ++fsi->last_ino; |
1da177e4 LT |
1708 | d_add(dentry, inode); |
1709 | } | |
b77a493b EP |
1710 | |
1711 | return 0; | |
1da177e4 LT |
1712 | } |
1713 | ||
66f8e2f0 JVS |
1714 | static int sel_make_ss_files(struct dentry *dir) |
1715 | { | |
1716 | struct super_block *sb = dir->d_sb; | |
1717 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
1718 | int i; | |
1719 | static struct tree_descr files[] = { | |
1720 | { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO }, | |
1721 | }; | |
1722 | ||
1723 | for (i = 0; i < ARRAY_SIZE(files); i++) { | |
1724 | struct inode *inode; | |
1725 | struct dentry *dentry; | |
1726 | ||
1727 | dentry = d_alloc_name(dir, files[i].name); | |
1728 | if (!dentry) | |
1729 | return -ENOMEM; | |
1730 | ||
1731 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1732 | if (!inode) { | |
1733 | dput(dentry); | |
1734 | return -ENOMEM; | |
1735 | } | |
1736 | ||
1737 | inode->i_fop = files[i].ops; | |
1738 | inode->i_ino = ++fsi->last_ino; | |
1739 | d_add(dentry, inode); | |
1740 | } | |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
1872981b | 1745 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1746 | size_t count, loff_t *ppos) |
1747 | { | |
0619f0f5 | 1748 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
f0ee2e46 JC |
1749 | char *con; |
1750 | u32 sid, len; | |
1751 | ssize_t ret; | |
1752 | ||
496ad9aa | 1753 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
0619f0f5 | 1754 | ret = security_sid_to_context(fsi->state, sid, &con, &len); |
b77a493b | 1755 | if (ret) |
f0ee2e46 JC |
1756 | return ret; |
1757 | ||
1758 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1759 | kfree(con); | |
1760 | return ret; | |
1761 | } | |
1762 | ||
1763 | static const struct file_operations sel_initcon_ops = { | |
1764 | .read = sel_read_initcon, | |
57a62c23 | 1765 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1766 | }; |
1767 | ||
1768 | static int sel_make_initcon_files(struct dentry *dir) | |
1769 | { | |
b77a493b | 1770 | int i; |
f0ee2e46 JC |
1771 | |
1772 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1773 | struct inode *inode; | |
1774 | struct dentry *dentry; | |
e3e0b582 SS |
1775 | const char *s = security_get_initial_sid_context(i); |
1776 | ||
1777 | if (!s) | |
1778 | continue; | |
1779 | dentry = d_alloc_name(dir, s); | |
b77a493b EP |
1780 | if (!dentry) |
1781 | return -ENOMEM; | |
f0ee2e46 JC |
1782 | |
1783 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1784 | if (!inode) { |
1785 | dput(dentry); | |
b77a493b | 1786 | return -ENOMEM; |
7e4237fa | 1787 | } |
b77a493b | 1788 | |
f0ee2e46 JC |
1789 | inode->i_fop = &sel_initcon_ops; |
1790 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1791 | d_add(dentry, inode); | |
1792 | } | |
b77a493b EP |
1793 | |
1794 | return 0; | |
f0ee2e46 JC |
1795 | } |
1796 | ||
e47c8fc5 CP |
1797 | static inline unsigned long sel_class_to_ino(u16 class) |
1798 | { | |
1799 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1800 | } | |
1801 | ||
1802 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1803 | { | |
92ae9e82 | 1804 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1805 | } |
1806 | ||
1807 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1808 | { | |
1809 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1810 | } | |
1811 | ||
1812 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1813 | { | |
1814 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1815 | } | |
1816 | ||
1872981b | 1817 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1818 | size_t count, loff_t *ppos) |
1819 | { | |
496ad9aa | 1820 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1821 | char res[TMPBUFLEN]; |
7e78c875 | 1822 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); |
cc1dad71 | 1823 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1824 | } |
1825 | ||
1826 | static const struct file_operations sel_class_ops = { | |
1827 | .read = sel_read_class, | |
57a62c23 | 1828 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1829 | }; |
1830 | ||
1872981b | 1831 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1832 | size_t count, loff_t *ppos) |
1833 | { | |
496ad9aa | 1834 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1835 | char res[TMPBUFLEN]; |
7e78c875 | 1836 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); |
cc1dad71 | 1837 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1838 | } |
1839 | ||
1840 | static const struct file_operations sel_perm_ops = { | |
1841 | .read = sel_read_perm, | |
57a62c23 | 1842 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1843 | }; |
1844 | ||
3bb56b25 PM |
1845 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1846 | size_t count, loff_t *ppos) | |
1847 | { | |
0619f0f5 | 1848 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
3bb56b25 PM |
1849 | int value; |
1850 | char tmpbuf[TMPBUFLEN]; | |
1851 | ssize_t length; | |
496ad9aa | 1852 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 | 1853 | |
0619f0f5 | 1854 | value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK); |
3bb56b25 PM |
1855 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); |
1856 | ||
1857 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1858 | } | |
1859 | ||
1860 | static const struct file_operations sel_policycap_ops = { | |
1861 | .read = sel_read_policycap, | |
57a62c23 | 1862 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1863 | }; |
1864 | ||
02a52c5c SS |
1865 | static int sel_make_perm_files(struct selinux_policy *newpolicy, |
1866 | char *objclass, int classvalue, | |
1867 | struct dentry *dir) | |
e47c8fc5 | 1868 | { |
b77a493b | 1869 | int i, rc, nperms; |
e47c8fc5 CP |
1870 | char **perms; |
1871 | ||
02a52c5c | 1872 | rc = security_get_permissions(newpolicy, objclass, &perms, &nperms); |
e47c8fc5 | 1873 | if (rc) |
b77a493b | 1874 | return rc; |
e47c8fc5 CP |
1875 | |
1876 | for (i = 0; i < nperms; i++) { | |
1877 | struct inode *inode; | |
1878 | struct dentry *dentry; | |
1879 | ||
b77a493b | 1880 | rc = -ENOMEM; |
e47c8fc5 | 1881 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1882 | if (!dentry) |
1883 | goto out; | |
e47c8fc5 | 1884 | |
b77a493b | 1885 | rc = -ENOMEM; |
e47c8fc5 | 1886 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
7e4237fa | 1887 | if (!inode) { |
1888 | dput(dentry); | |
b77a493b | 1889 | goto out; |
7e4237fa | 1890 | } |
b77a493b | 1891 | |
e47c8fc5 CP |
1892 | inode->i_fop = &sel_perm_ops; |
1893 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1894 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1895 | d_add(dentry, inode); |
1896 | } | |
b77a493b EP |
1897 | rc = 0; |
1898 | out: | |
e47c8fc5 CP |
1899 | for (i = 0; i < nperms; i++) |
1900 | kfree(perms[i]); | |
1901 | kfree(perms); | |
e47c8fc5 CP |
1902 | return rc; |
1903 | } | |
1904 | ||
02a52c5c SS |
1905 | static int sel_make_class_dir_entries(struct selinux_policy *newpolicy, |
1906 | char *classname, int index, | |
1907 | struct dentry *dir) | |
e47c8fc5 | 1908 | { |
0619f0f5 SS |
1909 | struct super_block *sb = dir->d_sb; |
1910 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
e47c8fc5 CP |
1911 | struct dentry *dentry = NULL; |
1912 | struct inode *inode = NULL; | |
1913 | int rc; | |
1914 | ||
1915 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1916 | if (!dentry) |
1917 | return -ENOMEM; | |
e47c8fc5 CP |
1918 | |
1919 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1920 | if (!inode) { |
1921 | dput(dentry); | |
b77a493b | 1922 | return -ENOMEM; |
7e4237fa | 1923 | } |
e47c8fc5 CP |
1924 | |
1925 | inode->i_fop = &sel_class_ops; | |
1926 | inode->i_ino = sel_class_to_ino(index); | |
1927 | d_add(dentry, inode); | |
1928 | ||
0619f0f5 | 1929 | dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); |
a1c2aa1e AV |
1930 | if (IS_ERR(dentry)) |
1931 | return PTR_ERR(dentry); | |
e47c8fc5 | 1932 | |
02a52c5c | 1933 | rc = sel_make_perm_files(newpolicy, classname, index, dentry); |
e47c8fc5 | 1934 | |
e47c8fc5 CP |
1935 | return rc; |
1936 | } | |
1937 | ||
66ec384a DB |
1938 | static int sel_make_classes(struct selinux_policy *newpolicy, |
1939 | struct dentry *class_dir, | |
1940 | unsigned long *last_class_ino) | |
e47c8fc5 | 1941 | { |
0619f0f5 | 1942 | |
b77a493b | 1943 | int rc, nclasses, i; |
e47c8fc5 CP |
1944 | char **classes; |
1945 | ||
02a52c5c | 1946 | rc = security_get_classes(newpolicy, &classes, &nclasses); |
b77a493b EP |
1947 | if (rc) |
1948 | return rc; | |
e47c8fc5 CP |
1949 | |
1950 | /* +2 since classes are 1-indexed */ | |
66ec384a | 1951 | *last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1952 | |
1953 | for (i = 0; i < nclasses; i++) { | |
1954 | struct dentry *class_name_dir; | |
1955 | ||
66ec384a DB |
1956 | class_name_dir = sel_make_dir(class_dir, classes[i], |
1957 | last_class_ino); | |
a1c2aa1e AV |
1958 | if (IS_ERR(class_name_dir)) { |
1959 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1960 | goto out; |
a1c2aa1e | 1961 | } |
e47c8fc5 CP |
1962 | |
1963 | /* i+1 since class values are 1-indexed */ | |
02a52c5c | 1964 | rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1, |
e47c8fc5 CP |
1965 | class_name_dir); |
1966 | if (rc) | |
b77a493b | 1967 | goto out; |
e47c8fc5 | 1968 | } |
b77a493b EP |
1969 | rc = 0; |
1970 | out: | |
e47c8fc5 CP |
1971 | for (i = 0; i < nclasses; i++) |
1972 | kfree(classes[i]); | |
1973 | kfree(classes); | |
e47c8fc5 CP |
1974 | return rc; |
1975 | } | |
1976 | ||
0619f0f5 | 1977 | static int sel_make_policycap(struct selinux_fs_info *fsi) |
3bb56b25 PM |
1978 | { |
1979 | unsigned int iter; | |
1980 | struct dentry *dentry = NULL; | |
1981 | struct inode *inode = NULL; | |
1982 | ||
3bb56b25 | 1983 | for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) { |
4dc2fce3 | 1984 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
0619f0f5 | 1985 | dentry = d_alloc_name(fsi->policycap_dir, |
4dc2fce3 | 1986 | selinux_policycap_names[iter]); |
3bb56b25 | 1987 | else |
0619f0f5 | 1988 | dentry = d_alloc_name(fsi->policycap_dir, "unknown"); |
3bb56b25 PM |
1989 | |
1990 | if (dentry == NULL) | |
1991 | return -ENOMEM; | |
1992 | ||
0619f0f5 | 1993 | inode = sel_make_inode(fsi->sb, S_IFREG | 0444); |
7e4237fa | 1994 | if (inode == NULL) { |
1995 | dput(dentry); | |
3bb56b25 | 1996 | return -ENOMEM; |
7e4237fa | 1997 | } |
3bb56b25 PM |
1998 | |
1999 | inode->i_fop = &sel_policycap_ops; | |
2000 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
2001 | d_add(dentry, inode); | |
2002 | } | |
2003 | ||
2004 | return 0; | |
2005 | } | |
2006 | ||
a1c2aa1e | 2007 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 2008 | unsigned long *ino) |
1da177e4 | 2009 | { |
a1c2aa1e | 2010 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
2011 | struct inode *inode; |
2012 | ||
a1c2aa1e AV |
2013 | if (!dentry) |
2014 | return ERR_PTR(-ENOMEM); | |
2015 | ||
2016 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
2017 | if (!inode) { | |
2018 | dput(dentry); | |
2019 | return ERR_PTR(-ENOMEM); | |
2020 | } | |
b77a493b | 2021 | |
1da177e4 LT |
2022 | inode->i_op = &simple_dir_inode_operations; |
2023 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 2024 | inode->i_ino = ++(*ino); |
40e906f8 | 2025 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 2026 | inc_nlink(inode); |
1da177e4 | 2027 | d_add(dentry, inode); |
edb20fb5 | 2028 | /* bump link count on parent directory, too */ |
ce0b16dd | 2029 | inc_nlink(d_inode(dir)); |
b77a493b | 2030 | |
a1c2aa1e | 2031 | return dentry; |
1da177e4 LT |
2032 | } |
2033 | ||
0eea6091 DB |
2034 | static struct dentry *sel_make_disconnected_dir(struct super_block *sb, |
2035 | unsigned long *ino) | |
2036 | { | |
2037 | struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
2038 | ||
2039 | if (!inode) | |
2040 | return ERR_PTR(-ENOMEM); | |
2041 | ||
2042 | inode->i_op = &simple_dir_inode_operations; | |
2043 | inode->i_fop = &simple_dir_operations; | |
2044 | inode->i_ino = ++(*ino); | |
2045 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
2046 | inc_nlink(inode); | |
2047 | return d_obtain_alias(inode); | |
2048 | } | |
2049 | ||
0619f0f5 SS |
2050 | #define NULL_FILE_NAME "null" |
2051 | ||
920f50b2 | 2052 | static int sel_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 2053 | { |
0619f0f5 | 2054 | struct selinux_fs_info *fsi; |
1da177e4 LT |
2055 | int ret; |
2056 | struct dentry *dentry; | |
a1c2aa1e | 2057 | struct inode *inode; |
1da177e4 LT |
2058 | struct inode_security_struct *isec; |
2059 | ||
cda37124 | 2060 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
2061 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
2062 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 2063 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
2064 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
2065 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2066 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2067 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2068 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
2069 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
2070 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
2071 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
2072 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2073 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
2074 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
2075 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 2076 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 2077 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
2078 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
2079 | S_IWUGO}, | |
1da177e4 LT |
2080 | /* last one */ {""} |
2081 | }; | |
0619f0f5 SS |
2082 | |
2083 | ret = selinux_fs_info_create(sb); | |
2084 | if (ret) | |
2085 | goto err; | |
2086 | ||
1da177e4 LT |
2087 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
2088 | if (ret) | |
161ce45a | 2089 | goto err; |
1da177e4 | 2090 | |
0619f0f5 SS |
2091 | fsi = sb->s_fs_info; |
2092 | fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); | |
2093 | if (IS_ERR(fsi->bool_dir)) { | |
2094 | ret = PTR_ERR(fsi->bool_dir); | |
2095 | fsi->bool_dir = NULL; | |
161ce45a | 2096 | goto err; |
a1c2aa1e | 2097 | } |
1da177e4 | 2098 | |
b77a493b | 2099 | ret = -ENOMEM; |
1da177e4 | 2100 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 2101 | if (!dentry) |
161ce45a | 2102 | goto err; |
1da177e4 | 2103 | |
b77a493b | 2104 | ret = -ENOMEM; |
1da177e4 | 2105 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
7e4237fa | 2106 | if (!inode) { |
2107 | dput(dentry); | |
161ce45a | 2108 | goto err; |
7e4237fa | 2109 | } |
b77a493b | 2110 | |
0619f0f5 | 2111 | inode->i_ino = ++fsi->last_ino; |
80788c22 | 2112 | isec = selinux_inode(inode); |
1da177e4 LT |
2113 | isec->sid = SECINITSID_DEVNULL; |
2114 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 2115 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
2116 | |
2117 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
2118 | d_add(dentry, inode); | |
1da177e4 | 2119 | |
0619f0f5 | 2120 | dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); |
a1c2aa1e AV |
2121 | if (IS_ERR(dentry)) { |
2122 | ret = PTR_ERR(dentry); | |
161ce45a | 2123 | goto err; |
a1c2aa1e | 2124 | } |
1da177e4 LT |
2125 | |
2126 | ret = sel_make_avc_files(dentry); | |
66f8e2f0 JVS |
2127 | |
2128 | dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino); | |
2129 | if (IS_ERR(dentry)) { | |
2130 | ret = PTR_ERR(dentry); | |
2131 | goto err; | |
2132 | } | |
2133 | ||
2134 | ret = sel_make_ss_files(dentry); | |
1da177e4 | 2135 | if (ret) |
161ce45a | 2136 | goto err; |
f0ee2e46 | 2137 | |
0619f0f5 | 2138 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); |
a1c2aa1e AV |
2139 | if (IS_ERR(dentry)) { |
2140 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 2141 | goto err; |
a1c2aa1e | 2142 | } |
f0ee2e46 JC |
2143 | |
2144 | ret = sel_make_initcon_files(dentry); | |
2145 | if (ret) | |
2146 | goto err; | |
2147 | ||
613ba187 | 2148 | fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino); |
0619f0f5 SS |
2149 | if (IS_ERR(fsi->class_dir)) { |
2150 | ret = PTR_ERR(fsi->class_dir); | |
2151 | fsi->class_dir = NULL; | |
3bb56b25 | 2152 | goto err; |
a1c2aa1e | 2153 | } |
3bb56b25 | 2154 | |
613ba187 | 2155 | fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME, |
0619f0f5 SS |
2156 | &fsi->last_ino); |
2157 | if (IS_ERR(fsi->policycap_dir)) { | |
2158 | ret = PTR_ERR(fsi->policycap_dir); | |
2159 | fsi->policycap_dir = NULL; | |
3bb56b25 | 2160 | goto err; |
a1c2aa1e | 2161 | } |
0619f0f5 | 2162 | |
02a52c5c SS |
2163 | ret = sel_make_policycap(fsi); |
2164 | if (ret) { | |
2165 | pr_err("SELinux: failed to load policy capabilities\n"); | |
0619f0f5 | 2166 | goto err; |
02a52c5c SS |
2167 | } |
2168 | ||
b77a493b | 2169 | return 0; |
161ce45a | 2170 | err: |
f8b69a5f | 2171 | pr_err("SELinux: %s: failed while creating inodes\n", |
744ba35e | 2172 | __func__); |
0619f0f5 SS |
2173 | |
2174 | selinux_fs_info_free(sb); | |
2175 | ||
b77a493b | 2176 | return ret; |
1da177e4 LT |
2177 | } |
2178 | ||
920f50b2 | 2179 | static int sel_get_tree(struct fs_context *fc) |
1da177e4 | 2180 | { |
920f50b2 DH |
2181 | return get_tree_single(fc, sel_fill_super); |
2182 | } | |
2183 | ||
2184 | static const struct fs_context_operations sel_context_ops = { | |
2185 | .get_tree = sel_get_tree, | |
2186 | }; | |
2187 | ||
2188 | static int sel_init_fs_context(struct fs_context *fc) | |
2189 | { | |
2190 | fc->ops = &sel_context_ops; | |
2191 | return 0; | |
1da177e4 LT |
2192 | } |
2193 | ||
0619f0f5 SS |
2194 | static void sel_kill_sb(struct super_block *sb) |
2195 | { | |
2196 | selinux_fs_info_free(sb); | |
2197 | kill_litter_super(sb); | |
2198 | } | |
2199 | ||
1da177e4 LT |
2200 | static struct file_system_type sel_fs_type = { |
2201 | .name = "selinuxfs", | |
920f50b2 | 2202 | .init_fs_context = sel_init_fs_context, |
0619f0f5 | 2203 | .kill_sb = sel_kill_sb, |
1da177e4 LT |
2204 | }; |
2205 | ||
2206 | struct vfsmount *selinuxfs_mount; | |
0619f0f5 | 2207 | struct path selinux_null; |
1da177e4 LT |
2208 | |
2209 | static int __init init_sel_fs(void) | |
2210 | { | |
0619f0f5 SS |
2211 | struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, |
2212 | sizeof(NULL_FILE_NAME)-1); | |
1da177e4 LT |
2213 | int err; |
2214 | ||
6c5a682e | 2215 | if (!selinux_enabled_boot) |
1da177e4 | 2216 | return 0; |
7a627e3b | 2217 | |
f9bb4882 EB |
2218 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
2219 | if (err) | |
2220 | return err; | |
7a627e3b | 2221 | |
1da177e4 | 2222 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 2223 | if (err) { |
f9bb4882 | 2224 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 2225 | return err; |
7a627e3b | 2226 | } |
b77a493b | 2227 | |
765927b2 | 2228 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b | 2229 | if (IS_ERR(selinuxfs_mount)) { |
f8b69a5f | 2230 | pr_err("selinuxfs: could not mount!\n"); |
b77a493b EP |
2231 | err = PTR_ERR(selinuxfs_mount); |
2232 | selinuxfs_mount = NULL; | |
1da177e4 | 2233 | } |
0619f0f5 SS |
2234 | selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, |
2235 | &null_name); | |
2236 | if (IS_ERR(selinux_null.dentry)) { | |
2237 | pr_err("selinuxfs: could not lookup null!\n"); | |
2238 | err = PTR_ERR(selinux_null.dentry); | |
2239 | selinux_null.dentry = NULL; | |
2240 | } | |
b77a493b | 2241 | |
1da177e4 LT |
2242 | return err; |
2243 | } | |
2244 | ||
2245 | __initcall(init_sel_fs); | |
2246 | ||
2247 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
2248 | void exit_sel_fs(void) | |
2249 | { | |
f9bb4882 | 2250 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
fd40ffc7 | 2251 | dput(selinux_null.dentry); |
423e0ab0 | 2252 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
2253 | unregister_filesystem(&sel_fs_type); |
2254 | } | |
2255 | #endif |