Commit | Line | Data |
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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* Updated: Karl MacMillan <kmacmillan@tresys.com> |
3 | * | |
1872981b | 4 | * Added conditional policy language extensions |
1da177e4 | 5 | * |
82c21bfa | 6 | * Updated: Hewlett-Packard <paul@paul-moore.com> |
3bb56b25 | 7 | * |
1872981b | 8 | * Added support for the policy capability bitmap |
3bb56b25 PM |
9 | * |
10 | * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. | |
1da177e4 LT |
11 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
12 | * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
1da177e4 LT |
13 | */ |
14 | ||
1da177e4 LT |
15 | #include <linux/kernel.h> |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/fs.h> | |
920f50b2 | 20 | #include <linux/fs_context.h> |
0619f0f5 | 21 | #include <linux/mount.h> |
bb003079 | 22 | #include <linux/mutex.h> |
0eea6091 | 23 | #include <linux/namei.h> |
1da177e4 LT |
24 | #include <linux/init.h> |
25 | #include <linux/string.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/major.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/percpu.h> | |
af601e46 | 30 | #include <linux/audit.h> |
f5269710 | 31 | #include <linux/uaccess.h> |
7a627e3b | 32 | #include <linux/kobject.h> |
0f7e4c33 | 33 | #include <linux/ctype.h> |
1da177e4 LT |
34 | |
35 | /* selinuxfs pseudo filesystem for exporting the security policy API. | |
36 | Based on the proc code and the fs/nfsd/nfsctl.c code. */ | |
37 | ||
38 | #include "flask.h" | |
39 | #include "avc.h" | |
40 | #include "avc_ss.h" | |
41 | #include "security.h" | |
42 | #include "objsec.h" | |
43 | #include "conditional.h" | |
2554a48f | 44 | #include "ima.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | enum sel_inos { |
47 | SEL_ROOT_INO = 2, | |
48 | SEL_LOAD, /* load policy */ | |
49 | SEL_ENFORCE, /* get or set enforcing status */ | |
50 | SEL_CONTEXT, /* validate context */ | |
51 | SEL_ACCESS, /* compute access decision */ | |
52 | SEL_CREATE, /* compute create labeling decision */ | |
53 | SEL_RELABEL, /* compute relabeling decision */ | |
54 | SEL_USER, /* compute reachable user contexts */ | |
55 | SEL_POLICYVERS, /* return policy version for this kernel */ | |
56 | SEL_COMMIT_BOOLS, /* commit new boolean values */ | |
57 | SEL_MLS, /* return if MLS policy is enabled */ | |
58 | SEL_DISABLE, /* disable SELinux until next reboot */ | |
1da177e4 LT |
59 | SEL_MEMBER, /* compute polyinstantiation membership decision */ |
60 | SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */ | |
4e5ab4cb | 61 | SEL_COMPAT_NET, /* whether to use old compat network packet controls */ |
3f12070e EP |
62 | SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */ |
63 | SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */ | |
11904167 | 64 | SEL_STATUS, /* export current status using mmap() */ |
cee74f47 | 65 | SEL_POLICY, /* allow userspace to read the in kernel policy */ |
f9df6458 | 66 | SEL_VALIDATE_TRANS, /* compute validatetrans decision */ |
6174eafc | 67 | SEL_INO_NEXT, /* The next inode number to use */ |
1da177e4 LT |
68 | }; |
69 | ||
0619f0f5 SS |
70 | struct selinux_fs_info { |
71 | struct dentry *bool_dir; | |
72 | unsigned int bool_num; | |
73 | char **bool_pending_names; | |
c3fae2b2 | 74 | int *bool_pending_values; |
0619f0f5 SS |
75 | struct dentry *class_dir; |
76 | unsigned long last_class_ino; | |
77 | bool policy_opened; | |
78 | struct dentry *policycap_dir; | |
0619f0f5 SS |
79 | unsigned long last_ino; |
80 | struct selinux_state *state; | |
81 | struct super_block *sb; | |
82 | }; | |
83 | ||
84 | static int selinux_fs_info_create(struct super_block *sb) | |
85 | { | |
86 | struct selinux_fs_info *fsi; | |
87 | ||
88 | fsi = kzalloc(sizeof(*fsi), GFP_KERNEL); | |
89 | if (!fsi) | |
90 | return -ENOMEM; | |
91 | ||
0619f0f5 SS |
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 | |
613ba187 DB |
120 | #define BOOL_DIR_NAME "booleans" |
121 | #define CLASS_DIR_NAME "class" | |
122 | #define POLICYCAP_DIR_NAME "policy_capabilities" | |
123 | ||
1da177e4 LT |
124 | #define TMPBUFLEN 12 |
125 | static ssize_t sel_read_enforce(struct file *filp, char __user *buf, | |
126 | size_t count, loff_t *ppos) | |
127 | { | |
0619f0f5 | 128 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
129 | char tmpbuf[TMPBUFLEN]; |
130 | ssize_t length; | |
131 | ||
aa8e712c | 132 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 133 | enforcing_enabled(fsi->state)); |
1da177e4 LT |
134 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
135 | } | |
136 | ||
137 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
1872981b | 138 | static ssize_t sel_write_enforce(struct file *file, const char __user *buf, |
1da177e4 LT |
139 | size_t count, loff_t *ppos) |
140 | ||
141 | { | |
0619f0f5 SS |
142 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
143 | struct selinux_state *state = fsi->state; | |
b77a493b | 144 | char *page = NULL; |
1da177e4 | 145 | ssize_t length; |
aa8e712c | 146 | int old_value, new_value; |
1da177e4 | 147 | |
bfd51626 | 148 | if (count >= PAGE_SIZE) |
8365a719 | 149 | return -ENOMEM; |
b77a493b EP |
150 | |
151 | /* No partial writes. */ | |
b77a493b | 152 | if (*ppos != 0) |
8365a719 | 153 | return -EINVAL; |
b77a493b | 154 | |
8365a719 AV |
155 | page = memdup_user_nul(buf, count); |
156 | if (IS_ERR(page)) | |
157 | return PTR_ERR(page); | |
1da177e4 LT |
158 | |
159 | length = -EINVAL; | |
160 | if (sscanf(page, "%d", &new_value) != 1) | |
161 | goto out; | |
162 | ||
ea49d10e SS |
163 | new_value = !!new_value; |
164 | ||
0619f0f5 | 165 | old_value = enforcing_enabled(state); |
aa8e712c | 166 | if (new_value != old_value) { |
6b6bc620 SS |
167 | length = avc_has_perm(&selinux_state, |
168 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
169 | SECCLASS_SECURITY, SECURITY__SETENFORCE, |
170 | NULL); | |
1da177e4 LT |
171 | if (length) |
172 | goto out; | |
cdfb6b34 | 173 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 | 174 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
6c5a682e | 175 | " enabled=1 old-enabled=1 lsm=selinux res=1", |
aa8e712c | 176 | new_value, old_value, |
581abc09 | 177 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
6c5a682e | 178 | audit_get_sessionid(current)); |
0619f0f5 | 179 | enforcing_set(state, new_value); |
aa8e712c | 180 | if (new_value) |
6b6bc620 | 181 | avc_ss_reset(state->avc, 0); |
aa8e712c | 182 | selnl_notify_setenforce(new_value); |
0619f0f5 | 183 | selinux_status_update_setenforce(state, new_value); |
aa8e712c | 184 | if (!new_value) |
42df744c | 185 | call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL); |
2554a48f LR |
186 | |
187 | selinux_ima_measure_state(state); | |
1da177e4 LT |
188 | } |
189 | length = count; | |
190 | out: | |
8365a719 | 191 | kfree(page); |
1da177e4 LT |
192 | return length; |
193 | } | |
194 | #else | |
195 | #define sel_write_enforce NULL | |
196 | #endif | |
197 | ||
9c2e08c5 | 198 | static const struct file_operations sel_enforce_ops = { |
1da177e4 LT |
199 | .read = sel_read_enforce, |
200 | .write = sel_write_enforce, | |
57a62c23 | 201 | .llseek = generic_file_llseek, |
1da177e4 LT |
202 | }; |
203 | ||
3f12070e EP |
204 | static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf, |
205 | size_t count, loff_t *ppos) | |
206 | { | |
0619f0f5 SS |
207 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
208 | struct selinux_state *state = fsi->state; | |
3f12070e EP |
209 | char tmpbuf[TMPBUFLEN]; |
210 | ssize_t length; | |
496ad9aa | 211 | ino_t ino = file_inode(filp)->i_ino; |
3f12070e | 212 | int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ? |
0619f0f5 SS |
213 | security_get_reject_unknown(state) : |
214 | !security_get_allow_unknown(state); | |
3f12070e EP |
215 | |
216 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown); | |
217 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
218 | } | |
219 | ||
220 | static const struct file_operations sel_handle_unknown_ops = { | |
221 | .read = sel_read_handle_unknown, | |
57a62c23 | 222 | .llseek = generic_file_llseek, |
3f12070e EP |
223 | }; |
224 | ||
11904167 KK |
225 | static int sel_open_handle_status(struct inode *inode, struct file *filp) |
226 | { | |
0619f0f5 SS |
227 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
228 | struct page *status = selinux_kernel_status_page(fsi->state); | |
11904167 KK |
229 | |
230 | if (!status) | |
231 | return -ENOMEM; | |
232 | ||
233 | filp->private_data = status; | |
234 | ||
235 | return 0; | |
236 | } | |
237 | ||
238 | static ssize_t sel_read_handle_status(struct file *filp, char __user *buf, | |
239 | size_t count, loff_t *ppos) | |
240 | { | |
241 | struct page *status = filp->private_data; | |
242 | ||
243 | BUG_ON(!status); | |
244 | ||
245 | return simple_read_from_buffer(buf, count, ppos, | |
246 | page_address(status), | |
247 | sizeof(struct selinux_kernel_status)); | |
248 | } | |
249 | ||
250 | static int sel_mmap_handle_status(struct file *filp, | |
251 | struct vm_area_struct *vma) | |
252 | { | |
253 | struct page *status = filp->private_data; | |
254 | unsigned long size = vma->vm_end - vma->vm_start; | |
255 | ||
256 | BUG_ON(!status); | |
257 | ||
258 | /* only allows one page from the head */ | |
259 | if (vma->vm_pgoff > 0 || size != PAGE_SIZE) | |
260 | return -EIO; | |
261 | /* disallow writable mapping */ | |
262 | if (vma->vm_flags & VM_WRITE) | |
263 | return -EPERM; | |
264 | /* disallow mprotect() turns it into writable */ | |
265 | vma->vm_flags &= ~VM_MAYWRITE; | |
266 | ||
267 | return remap_pfn_range(vma, vma->vm_start, | |
268 | page_to_pfn(status), | |
269 | size, vma->vm_page_prot); | |
270 | } | |
271 | ||
272 | static const struct file_operations sel_handle_status_ops = { | |
273 | .open = sel_open_handle_status, | |
274 | .read = sel_read_handle_status, | |
275 | .mmap = sel_mmap_handle_status, | |
276 | .llseek = generic_file_llseek, | |
277 | }; | |
278 | ||
1da177e4 | 279 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
1872981b | 280 | static ssize_t sel_write_disable(struct file *file, const char __user *buf, |
1da177e4 LT |
281 | size_t count, loff_t *ppos) |
282 | ||
283 | { | |
0619f0f5 | 284 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 285 | char *page; |
1da177e4 LT |
286 | ssize_t length; |
287 | int new_value; | |
4195ed42 | 288 | int enforcing; |
1da177e4 | 289 | |
89b223bf PM |
290 | /* NOTE: we are now officially considering runtime disable as |
291 | * deprecated, and using it will become increasingly painful | |
292 | * (e.g. sleeping/blocking) as we progress through future | |
293 | * kernel releases until eventually it is removed | |
294 | */ | |
295 | pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n"); | |
43b66662 PM |
296 | pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n"); |
297 | ssleep(5); | |
89b223bf | 298 | |
bfd51626 | 299 | if (count >= PAGE_SIZE) |
8365a719 | 300 | return -ENOMEM; |
b77a493b EP |
301 | |
302 | /* No partial writes. */ | |
b77a493b | 303 | if (*ppos != 0) |
8365a719 | 304 | return -EINVAL; |
b77a493b | 305 | |
8365a719 AV |
306 | page = memdup_user_nul(buf, count); |
307 | if (IS_ERR(page)) | |
308 | return PTR_ERR(page); | |
1da177e4 LT |
309 | |
310 | length = -EINVAL; | |
311 | if (sscanf(page, "%d", &new_value) != 1) | |
312 | goto out; | |
313 | ||
314 | if (new_value) { | |
4195ed42 | 315 | enforcing = enforcing_enabled(fsi->state); |
0619f0f5 | 316 | length = selinux_disable(fsi->state); |
b77a493b | 317 | if (length) |
1da177e4 | 318 | goto out; |
cdfb6b34 | 319 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS, |
4195ed42 | 320 | "enforcing=%d old_enforcing=%d auid=%u ses=%u" |
6c5a682e | 321 | " enabled=0 old-enabled=1 lsm=selinux res=1", |
4195ed42 | 322 | enforcing, enforcing, |
581abc09 | 323 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
6c5a682e | 324 | audit_get_sessionid(current)); |
1da177e4 LT |
325 | } |
326 | ||
327 | length = count; | |
328 | out: | |
8365a719 | 329 | kfree(page); |
1da177e4 LT |
330 | return length; |
331 | } | |
332 | #else | |
333 | #define sel_write_disable NULL | |
334 | #endif | |
335 | ||
9c2e08c5 | 336 | static const struct file_operations sel_disable_ops = { |
1da177e4 | 337 | .write = sel_write_disable, |
57a62c23 | 338 | .llseek = generic_file_llseek, |
1da177e4 LT |
339 | }; |
340 | ||
341 | static ssize_t sel_read_policyvers(struct file *filp, char __user *buf, | |
1872981b | 342 | size_t count, loff_t *ppos) |
1da177e4 LT |
343 | { |
344 | char tmpbuf[TMPBUFLEN]; | |
345 | ssize_t length; | |
346 | ||
347 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX); | |
348 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
349 | } | |
350 | ||
9c2e08c5 | 351 | static const struct file_operations sel_policyvers_ops = { |
1da177e4 | 352 | .read = sel_read_policyvers, |
57a62c23 | 353 | .llseek = generic_file_llseek, |
1da177e4 LT |
354 | }; |
355 | ||
356 | /* declaration for sel_write_load */ | |
66ec384a DB |
357 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
358 | unsigned int *bool_num, char ***bool_pending_names, | |
c3fae2b2 | 359 | int **bool_pending_values); |
66ec384a DB |
360 | static int sel_make_classes(struct selinux_policy *newpolicy, |
361 | struct dentry *class_dir, | |
362 | unsigned long *last_class_ino); | |
e47c8fc5 CP |
363 | |
364 | /* declaration for sel_make_class_dirs */ | |
a1c2aa1e | 365 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
e47c8fc5 | 366 | unsigned long *ino); |
1da177e4 | 367 | |
0eea6091 DB |
368 | /* declaration for sel_make_policy_nodes */ |
369 | static struct dentry *sel_make_disconnected_dir(struct super_block *sb, | |
370 | unsigned long *ino); | |
371 | ||
372 | /* declaration for sel_make_policy_nodes */ | |
aeecf4a3 DB |
373 | static void sel_remove_entries(struct dentry *de); |
374 | ||
1da177e4 LT |
375 | static ssize_t sel_read_mls(struct file *filp, char __user *buf, |
376 | size_t count, loff_t *ppos) | |
377 | { | |
0619f0f5 | 378 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
379 | char tmpbuf[TMPBUFLEN]; |
380 | ssize_t length; | |
381 | ||
0719aaf5 | 382 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", |
0619f0f5 | 383 | security_mls_enabled(fsi->state)); |
1da177e4 LT |
384 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
385 | } | |
386 | ||
9c2e08c5 | 387 | static const struct file_operations sel_mls_ops = { |
1da177e4 | 388 | .read = sel_read_mls, |
57a62c23 | 389 | .llseek = generic_file_llseek, |
1da177e4 LT |
390 | }; |
391 | ||
cee74f47 EP |
392 | struct policy_load_memory { |
393 | size_t len; | |
394 | void *data; | |
395 | }; | |
396 | ||
397 | static int sel_open_policy(struct inode *inode, struct file *filp) | |
398 | { | |
0619f0f5 SS |
399 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
400 | struct selinux_state *state = fsi->state; | |
cee74f47 EP |
401 | struct policy_load_memory *plm = NULL; |
402 | int rc; | |
403 | ||
404 | BUG_ON(filp->private_data); | |
405 | ||
9ff9abc4 | 406 | mutex_lock(&fsi->state->policy_mutex); |
cee74f47 | 407 | |
6b6bc620 SS |
408 | rc = avc_has_perm(&selinux_state, |
409 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 410 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 EP |
411 | if (rc) |
412 | goto err; | |
413 | ||
414 | rc = -EBUSY; | |
0619f0f5 | 415 | if (fsi->policy_opened) |
cee74f47 EP |
416 | goto err; |
417 | ||
418 | rc = -ENOMEM; | |
419 | plm = kzalloc(sizeof(*plm), GFP_KERNEL); | |
420 | if (!plm) | |
421 | goto err; | |
422 | ||
0619f0f5 | 423 | rc = security_read_policy(state, &plm->data, &plm->len); |
cee74f47 EP |
424 | if (rc) |
425 | goto err; | |
426 | ||
66ccd256 OM |
427 | if ((size_t)i_size_read(inode) != plm->len) { |
428 | inode_lock(inode); | |
429 | i_size_write(inode, plm->len); | |
430 | inode_unlock(inode); | |
431 | } | |
432 | ||
0619f0f5 | 433 | fsi->policy_opened = 1; |
cee74f47 EP |
434 | |
435 | filp->private_data = plm; | |
436 | ||
9ff9abc4 | 437 | mutex_unlock(&fsi->state->policy_mutex); |
cee74f47 EP |
438 | |
439 | return 0; | |
440 | err: | |
9ff9abc4 | 441 | mutex_unlock(&fsi->state->policy_mutex); |
cee74f47 EP |
442 | |
443 | if (plm) | |
444 | vfree(plm->data); | |
445 | kfree(plm); | |
446 | return rc; | |
447 | } | |
448 | ||
449 | static int sel_release_policy(struct inode *inode, struct file *filp) | |
450 | { | |
0619f0f5 | 451 | struct selinux_fs_info *fsi = inode->i_sb->s_fs_info; |
cee74f47 EP |
452 | struct policy_load_memory *plm = filp->private_data; |
453 | ||
454 | BUG_ON(!plm); | |
455 | ||
0619f0f5 | 456 | fsi->policy_opened = 0; |
cee74f47 EP |
457 | |
458 | vfree(plm->data); | |
459 | kfree(plm); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static ssize_t sel_read_policy(struct file *filp, char __user *buf, | |
465 | size_t count, loff_t *ppos) | |
466 | { | |
467 | struct policy_load_memory *plm = filp->private_data; | |
468 | int ret; | |
469 | ||
6b6bc620 SS |
470 | ret = avc_has_perm(&selinux_state, |
471 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 472 | SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL); |
cee74f47 | 473 | if (ret) |
0da74120 | 474 | return ret; |
cee74f47 | 475 | |
0da74120 | 476 | return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len); |
cee74f47 EP |
477 | } |
478 | ||
ac9a1f6d | 479 | static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf) |
845ca30f | 480 | { |
11bac800 | 481 | struct policy_load_memory *plm = vmf->vma->vm_file->private_data; |
845ca30f EP |
482 | unsigned long offset; |
483 | struct page *page; | |
484 | ||
485 | if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE)) | |
486 | return VM_FAULT_SIGBUS; | |
487 | ||
488 | offset = vmf->pgoff << PAGE_SHIFT; | |
489 | if (offset >= roundup(plm->len, PAGE_SIZE)) | |
490 | return VM_FAULT_SIGBUS; | |
491 | ||
492 | page = vmalloc_to_page(plm->data + offset); | |
493 | get_page(page); | |
494 | ||
495 | vmf->page = page; | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
7cbea8dc | 500 | static const struct vm_operations_struct sel_mmap_policy_ops = { |
845ca30f EP |
501 | .fault = sel_mmap_policy_fault, |
502 | .page_mkwrite = sel_mmap_policy_fault, | |
503 | }; | |
504 | ||
ad3fa08c | 505 | static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma) |
845ca30f EP |
506 | { |
507 | if (vma->vm_flags & VM_SHARED) { | |
508 | /* do not allow mprotect to make mapping writable */ | |
509 | vma->vm_flags &= ~VM_MAYWRITE; | |
510 | ||
511 | if (vma->vm_flags & VM_WRITE) | |
512 | return -EACCES; | |
513 | } | |
514 | ||
314e51b9 | 515 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
845ca30f EP |
516 | vma->vm_ops = &sel_mmap_policy_ops; |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
cee74f47 EP |
521 | static const struct file_operations sel_policy_ops = { |
522 | .open = sel_open_policy, | |
523 | .read = sel_read_policy, | |
845ca30f | 524 | .mmap = sel_mmap_policy, |
cee74f47 | 525 | .release = sel_release_policy, |
47a93a5b | 526 | .llseek = generic_file_llseek, |
cee74f47 EP |
527 | }; |
528 | ||
0eea6091 | 529 | static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names, |
c3fae2b2 | 530 | int *bool_values) |
aeecf4a3 DB |
531 | { |
532 | u32 i; | |
533 | ||
534 | /* bool_dir cleanup */ | |
0eea6091 DB |
535 | for (i = 0; i < bool_num; i++) |
536 | kfree(bool_names[i]); | |
537 | kfree(bool_names); | |
538 | kfree(bool_values); | |
aeecf4a3 DB |
539 | } |
540 | ||
02a52c5c SS |
541 | static int sel_make_policy_nodes(struct selinux_fs_info *fsi, |
542 | struct selinux_policy *newpolicy) | |
0619f0f5 | 543 | { |
0eea6091 DB |
544 | int ret = 0; |
545 | struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry; | |
546 | unsigned int tmp_bool_num, old_bool_num; | |
547 | char **tmp_bool_names, **old_bool_names; | |
c3fae2b2 | 548 | int *tmp_bool_values, *old_bool_values; |
0eea6091 DB |
549 | unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */ |
550 | ||
551 | tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino); | |
552 | if (IS_ERR(tmp_parent)) | |
553 | return PTR_ERR(tmp_parent); | |
554 | ||
555 | tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ | |
556 | tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino); | |
557 | if (IS_ERR(tmp_bool_dir)) { | |
558 | ret = PTR_ERR(tmp_bool_dir); | |
559 | goto out; | |
560 | } | |
0619f0f5 | 561 | |
0eea6091 DB |
562 | tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */ |
563 | tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino); | |
564 | if (IS_ERR(tmp_class_dir)) { | |
565 | ret = PTR_ERR(tmp_class_dir); | |
566 | goto out; | |
567 | } | |
aeecf4a3 | 568 | |
0eea6091 DB |
569 | ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num, |
570 | &tmp_bool_names, &tmp_bool_values); | |
ee5de60a | 571 | if (ret) |
0eea6091 | 572 | goto out; |
0619f0f5 | 573 | |
0eea6091 | 574 | ret = sel_make_classes(newpolicy, tmp_class_dir, |
66ec384a | 575 | &fsi->last_class_ino); |
ee5de60a | 576 | if (ret) |
0eea6091 | 577 | goto out; |
0619f0f5 | 578 | |
0eea6091 DB |
579 | /* booleans */ |
580 | old_dentry = fsi->bool_dir; | |
581 | lock_rename(tmp_bool_dir, old_dentry); | |
582 | d_exchange(tmp_bool_dir, fsi->bool_dir); | |
583 | ||
584 | old_bool_num = fsi->bool_num; | |
585 | old_bool_names = fsi->bool_pending_names; | |
586 | old_bool_values = fsi->bool_pending_values; | |
587 | ||
588 | fsi->bool_num = tmp_bool_num; | |
589 | fsi->bool_pending_names = tmp_bool_names; | |
590 | fsi->bool_pending_values = tmp_bool_values; | |
591 | ||
592 | sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values); | |
593 | ||
594 | fsi->bool_dir = tmp_bool_dir; | |
595 | unlock_rename(tmp_bool_dir, old_dentry); | |
596 | ||
597 | /* classes */ | |
598 | old_dentry = fsi->class_dir; | |
599 | lock_rename(tmp_class_dir, old_dentry); | |
600 | d_exchange(tmp_class_dir, fsi->class_dir); | |
601 | fsi->class_dir = tmp_class_dir; | |
602 | unlock_rename(tmp_class_dir, old_dentry); | |
603 | ||
604 | out: | |
605 | /* Since the other temporary dirs are children of tmp_parent | |
606 | * this will handle all the cleanup in the case of a failure before | |
607 | * the swapover | |
608 | */ | |
609 | sel_remove_entries(tmp_parent); | |
610 | dput(tmp_parent); /* d_genocide() only handles the children */ | |
611 | ||
612 | return ret; | |
0619f0f5 SS |
613 | } |
614 | ||
1872981b | 615 | static ssize_t sel_write_load(struct file *file, const char __user *buf, |
1da177e4 LT |
616 | size_t count, loff_t *ppos) |
617 | ||
618 | { | |
0619f0f5 | 619 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
6406887a | 620 | struct selinux_load_state load_state; |
1da177e4 LT |
621 | ssize_t length; |
622 | void *data = NULL; | |
623 | ||
9ff9abc4 | 624 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 625 | |
6b6bc620 SS |
626 | length = avc_has_perm(&selinux_state, |
627 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 628 | SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL); |
1da177e4 LT |
629 | if (length) |
630 | goto out; | |
631 | ||
b77a493b EP |
632 | /* No partial writes. */ |
633 | length = -EINVAL; | |
634 | if (*ppos != 0) | |
1da177e4 | 635 | goto out; |
1da177e4 | 636 | |
b77a493b EP |
637 | length = -ENOMEM; |
638 | data = vmalloc(count); | |
639 | if (!data) | |
1da177e4 | 640 | goto out; |
1da177e4 LT |
641 | |
642 | length = -EFAULT; | |
643 | if (copy_from_user(data, buf, count) != 0) | |
644 | goto out; | |
645 | ||
6406887a | 646 | length = security_load_policy(fsi->state, data, count, &load_state); |
4262fb51 GT |
647 | if (length) { |
648 | pr_warn_ratelimited("SELinux: failed to load policy\n"); | |
1da177e4 | 649 | goto out; |
4262fb51 | 650 | } |
1da177e4 | 651 | |
6406887a | 652 | length = sel_make_policy_nodes(fsi, load_state.policy); |
02a52c5c | 653 | if (length) { |
ee5de60a | 654 | pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n"); |
6406887a | 655 | selinux_policy_cancel(fsi->state, &load_state); |
519dad3b | 656 | goto out; |
02a52c5c SS |
657 | } |
658 | ||
6406887a | 659 | selinux_policy_commit(fsi->state, &load_state); |
b77a493b EP |
660 | |
661 | length = count; | |
e47c8fc5 | 662 | |
cdfb6b34 | 663 | audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD, |
d141136f | 664 | "auid=%u ses=%u lsm=selinux res=1", |
581abc09 | 665 | from_kuid(&init_user_ns, audit_get_loginuid(current)), |
4746ec5b | 666 | audit_get_sessionid(current)); |
1da177e4 | 667 | out: |
9ff9abc4 | 668 | mutex_unlock(&fsi->state->policy_mutex); |
1da177e4 LT |
669 | vfree(data); |
670 | return length; | |
671 | } | |
672 | ||
9c2e08c5 | 673 | static const struct file_operations sel_load_ops = { |
1da177e4 | 674 | .write = sel_write_load, |
57a62c23 | 675 | .llseek = generic_file_llseek, |
1da177e4 LT |
676 | }; |
677 | ||
1872981b | 678 | static ssize_t sel_write_context(struct file *file, char *buf, size_t size) |
1da177e4 | 679 | { |
0619f0f5 SS |
680 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
681 | struct selinux_state *state = fsi->state; | |
b77a493b | 682 | char *canon = NULL; |
ce9982d0 | 683 | u32 sid, len; |
1da177e4 LT |
684 | ssize_t length; |
685 | ||
6b6bc620 SS |
686 | length = avc_has_perm(&selinux_state, |
687 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 688 | SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL); |
1da177e4 | 689 | if (length) |
b77a493b | 690 | goto out; |
1da177e4 | 691 | |
0619f0f5 | 692 | length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL); |
b77a493b EP |
693 | if (length) |
694 | goto out; | |
1da177e4 | 695 | |
0619f0f5 | 696 | length = security_sid_to_context(state, sid, &canon, &len); |
b77a493b EP |
697 | if (length) |
698 | goto out; | |
ce9982d0 | 699 | |
b77a493b | 700 | length = -ERANGE; |
ce9982d0 | 701 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 702 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 703 | "payload max\n", __func__, len); |
1da177e4 | 704 | goto out; |
ce9982d0 | 705 | } |
1da177e4 | 706 | |
ce9982d0 SS |
707 | memcpy(buf, canon, len); |
708 | length = len; | |
1da177e4 | 709 | out: |
ce9982d0 | 710 | kfree(canon); |
1da177e4 LT |
711 | return length; |
712 | } | |
713 | ||
1da177e4 LT |
714 | static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf, |
715 | size_t count, loff_t *ppos) | |
716 | { | |
0619f0f5 | 717 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1da177e4 LT |
718 | char tmpbuf[TMPBUFLEN]; |
719 | ssize_t length; | |
720 | ||
8861d0af LR |
721 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
722 | checkreqprot_get(fsi->state)); | |
1da177e4 LT |
723 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
724 | } | |
725 | ||
1872981b | 726 | static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf, |
1da177e4 LT |
727 | size_t count, loff_t *ppos) |
728 | { | |
0619f0f5 | 729 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
8365a719 | 730 | char *page; |
1da177e4 LT |
731 | ssize_t length; |
732 | unsigned int new_value; | |
733 | ||
6b6bc620 SS |
734 | length = avc_has_perm(&selinux_state, |
735 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
736 | SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT, |
737 | NULL); | |
1da177e4 | 738 | if (length) |
8365a719 | 739 | return length; |
1da177e4 | 740 | |
bfd51626 | 741 | if (count >= PAGE_SIZE) |
8365a719 | 742 | return -ENOMEM; |
b77a493b EP |
743 | |
744 | /* No partial writes. */ | |
b77a493b | 745 | if (*ppos != 0) |
8365a719 | 746 | return -EINVAL; |
b77a493b | 747 | |
8365a719 AV |
748 | page = memdup_user_nul(buf, count); |
749 | if (IS_ERR(page)) | |
750 | return PTR_ERR(page); | |
1da177e4 LT |
751 | |
752 | length = -EINVAL; | |
753 | if (sscanf(page, "%u", &new_value) != 1) | |
754 | goto out; | |
755 | ||
e9c38f9f SS |
756 | if (new_value) { |
757 | char comm[sizeof(current->comm)]; | |
758 | ||
759 | memcpy(comm, current->comm, sizeof(comm)); | |
81200b02 PM |
760 | pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n", |
761 | comm, current->pid); | |
e9c38f9f SS |
762 | } |
763 | ||
8861d0af | 764 | checkreqprot_set(fsi->state, (new_value ? 1 : 0)); |
6a9e261c PM |
765 | if (new_value) |
766 | ssleep(5); | |
1da177e4 | 767 | length = count; |
2554a48f LR |
768 | |
769 | selinux_ima_measure_state(fsi->state); | |
770 | ||
1da177e4 | 771 | out: |
8365a719 | 772 | kfree(page); |
1da177e4 LT |
773 | return length; |
774 | } | |
9c2e08c5 | 775 | static const struct file_operations sel_checkreqprot_ops = { |
1da177e4 LT |
776 | .read = sel_read_checkreqprot, |
777 | .write = sel_write_checkreqprot, | |
57a62c23 | 778 | .llseek = generic_file_llseek, |
1da177e4 LT |
779 | }; |
780 | ||
f9df6458 AP |
781 | static ssize_t sel_write_validatetrans(struct file *file, |
782 | const char __user *buf, | |
783 | size_t count, loff_t *ppos) | |
784 | { | |
0619f0f5 SS |
785 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
786 | struct selinux_state *state = fsi->state; | |
f9df6458 AP |
787 | char *oldcon = NULL, *newcon = NULL, *taskcon = NULL; |
788 | char *req = NULL; | |
789 | u32 osid, nsid, tsid; | |
790 | u16 tclass; | |
791 | int rc; | |
792 | ||
6b6bc620 SS |
793 | rc = avc_has_perm(&selinux_state, |
794 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 795 | SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL); |
f9df6458 AP |
796 | if (rc) |
797 | goto out; | |
798 | ||
799 | rc = -ENOMEM; | |
800 | if (count >= PAGE_SIZE) | |
801 | goto out; | |
802 | ||
803 | /* No partial writes. */ | |
804 | rc = -EINVAL; | |
805 | if (*ppos != 0) | |
806 | goto out; | |
807 | ||
0b884d25 AV |
808 | req = memdup_user_nul(buf, count); |
809 | if (IS_ERR(req)) { | |
810 | rc = PTR_ERR(req); | |
811 | req = NULL; | |
f9df6458 | 812 | goto out; |
0b884d25 | 813 | } |
f9df6458 AP |
814 | |
815 | rc = -ENOMEM; | |
816 | oldcon = kzalloc(count + 1, GFP_KERNEL); | |
817 | if (!oldcon) | |
818 | goto out; | |
819 | ||
820 | newcon = kzalloc(count + 1, GFP_KERNEL); | |
821 | if (!newcon) | |
822 | goto out; | |
823 | ||
824 | taskcon = kzalloc(count + 1, GFP_KERNEL); | |
825 | if (!taskcon) | |
826 | goto out; | |
827 | ||
828 | rc = -EINVAL; | |
829 | if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4) | |
830 | goto out; | |
831 | ||
0619f0f5 | 832 | rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL); |
f9df6458 AP |
833 | if (rc) |
834 | goto out; | |
835 | ||
0619f0f5 | 836 | rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL); |
f9df6458 AP |
837 | if (rc) |
838 | goto out; | |
839 | ||
0619f0f5 | 840 | rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL); |
f9df6458 AP |
841 | if (rc) |
842 | goto out; | |
843 | ||
0619f0f5 | 844 | rc = security_validate_transition_user(state, osid, nsid, tsid, tclass); |
f9df6458 AP |
845 | if (!rc) |
846 | rc = count; | |
847 | out: | |
848 | kfree(req); | |
849 | kfree(oldcon); | |
850 | kfree(newcon); | |
851 | kfree(taskcon); | |
852 | return rc; | |
853 | } | |
854 | ||
855 | static const struct file_operations sel_transition_ops = { | |
856 | .write = sel_write_validatetrans, | |
857 | .llseek = generic_file_llseek, | |
858 | }; | |
859 | ||
1da177e4 LT |
860 | /* |
861 | * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c | |
862 | */ | |
1872981b EP |
863 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size); |
864 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size); | |
865 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size); | |
866 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size); | |
867 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size); | |
1da177e4 | 868 | |
631d2b49 | 869 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
1da177e4 LT |
870 | [SEL_ACCESS] = sel_write_access, |
871 | [SEL_CREATE] = sel_write_create, | |
872 | [SEL_RELABEL] = sel_write_relabel, | |
873 | [SEL_USER] = sel_write_user, | |
874 | [SEL_MEMBER] = sel_write_member, | |
ce9982d0 | 875 | [SEL_CONTEXT] = sel_write_context, |
1da177e4 LT |
876 | }; |
877 | ||
878 | static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) | |
879 | { | |
496ad9aa | 880 | ino_t ino = file_inode(file)->i_ino; |
1da177e4 LT |
881 | char *data; |
882 | ssize_t rv; | |
883 | ||
6e20a64a | 884 | if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) |
1da177e4 LT |
885 | return -EINVAL; |
886 | ||
887 | data = simple_transaction_get(file, buf, size); | |
888 | if (IS_ERR(data)) | |
889 | return PTR_ERR(data); | |
890 | ||
1872981b EP |
891 | rv = write_op[ino](file, data, size); |
892 | if (rv > 0) { | |
1da177e4 LT |
893 | simple_transaction_set(file, rv); |
894 | rv = size; | |
895 | } | |
896 | return rv; | |
897 | } | |
898 | ||
9c2e08c5 | 899 | static const struct file_operations transaction_ops = { |
1da177e4 LT |
900 | .write = selinux_transaction_write, |
901 | .read = simple_transaction_read, | |
902 | .release = simple_transaction_release, | |
57a62c23 | 903 | .llseek = generic_file_llseek, |
1da177e4 LT |
904 | }; |
905 | ||
906 | /* | |
907 | * payload - write methods | |
908 | * If the method has a response, the response should be put in buf, | |
909 | * and the length returned. Otherwise return 0 or and -error. | |
910 | */ | |
911 | ||
1872981b | 912 | static ssize_t sel_write_access(struct file *file, char *buf, size_t size) |
1da177e4 | 913 | { |
0619f0f5 SS |
914 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
915 | struct selinux_state *state = fsi->state; | |
b77a493b | 916 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
917 | u32 ssid, tsid; |
918 | u16 tclass; | |
1da177e4 LT |
919 | struct av_decision avd; |
920 | ssize_t length; | |
921 | ||
6b6bc620 SS |
922 | length = avc_has_perm(&selinux_state, |
923 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 | 924 | SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL); |
1da177e4 | 925 | if (length) |
b77a493b | 926 | goto out; |
1da177e4 LT |
927 | |
928 | length = -ENOMEM; | |
c1a7368a | 929 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 930 | if (!scon) |
b77a493b | 931 | goto out; |
1da177e4 | 932 | |
b77a493b | 933 | length = -ENOMEM; |
c1a7368a | 934 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
935 | if (!tcon) |
936 | goto out; | |
1da177e4 LT |
937 | |
938 | length = -EINVAL; | |
19439d05 | 939 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) |
b77a493b | 940 | goto out; |
1da177e4 | 941 | |
0619f0f5 | 942 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
943 | if (length) |
944 | goto out; | |
945 | ||
0619f0f5 | 946 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
947 | if (length) |
948 | goto out; | |
1da177e4 | 949 | |
0619f0f5 | 950 | security_compute_av_user(state, ssid, tsid, tclass, &avd); |
1da177e4 LT |
951 | |
952 | length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, | |
8a6f83af | 953 | "%x %x %x %x %u %x", |
f1c6381a | 954 | avd.allowed, 0xffffffff, |
1da177e4 | 955 | avd.auditallow, avd.auditdeny, |
8a6f83af | 956 | avd.seqno, avd.flags); |
1da177e4 | 957 | out: |
b77a493b | 958 | kfree(tcon); |
1da177e4 LT |
959 | kfree(scon); |
960 | return length; | |
961 | } | |
962 | ||
1872981b | 963 | static ssize_t sel_write_create(struct file *file, char *buf, size_t size) |
1da177e4 | 964 | { |
0619f0f5 SS |
965 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
966 | struct selinux_state *state = fsi->state; | |
b77a493b | 967 | char *scon = NULL, *tcon = NULL; |
f50a3ec9 | 968 | char *namebuf = NULL, *objname = NULL; |
1da177e4 LT |
969 | u32 ssid, tsid, newsid; |
970 | u16 tclass; | |
971 | ssize_t length; | |
b77a493b | 972 | char *newcon = NULL; |
1da177e4 | 973 | u32 len; |
f50a3ec9 | 974 | int nargs; |
1da177e4 | 975 | |
6b6bc620 SS |
976 | length = avc_has_perm(&selinux_state, |
977 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
978 | SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE, |
979 | NULL); | |
1da177e4 | 980 | if (length) |
b77a493b | 981 | goto out; |
1da177e4 LT |
982 | |
983 | length = -ENOMEM; | |
c1a7368a | 984 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 985 | if (!scon) |
b77a493b | 986 | goto out; |
1da177e4 | 987 | |
b77a493b | 988 | length = -ENOMEM; |
c1a7368a | 989 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
990 | if (!tcon) |
991 | goto out; | |
1da177e4 | 992 | |
f50a3ec9 KK |
993 | length = -ENOMEM; |
994 | namebuf = kzalloc(size + 1, GFP_KERNEL); | |
995 | if (!namebuf) | |
996 | goto out; | |
997 | ||
1da177e4 | 998 | length = -EINVAL; |
f50a3ec9 KK |
999 | nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf); |
1000 | if (nargs < 3 || nargs > 4) | |
b77a493b | 1001 | goto out; |
0f7e4c33 KK |
1002 | if (nargs == 4) { |
1003 | /* | |
1004 | * If and when the name of new object to be queried contains | |
1005 | * either whitespace or multibyte characters, they shall be | |
1006 | * encoded based on the percentage-encoding rule. | |
1007 | * If not encoded, the sscanf logic picks up only left-half | |
1008 | * of the supplied name; splitted by a whitespace unexpectedly. | |
1009 | */ | |
1010 | char *r, *w; | |
1011 | int c1, c2; | |
1012 | ||
1013 | r = w = namebuf; | |
1014 | do { | |
1015 | c1 = *r++; | |
1016 | if (c1 == '+') | |
1017 | c1 = ' '; | |
1018 | else if (c1 == '%') { | |
af7ff2c2 AS |
1019 | c1 = hex_to_bin(*r++); |
1020 | if (c1 < 0) | |
0f7e4c33 | 1021 | goto out; |
af7ff2c2 AS |
1022 | c2 = hex_to_bin(*r++); |
1023 | if (c2 < 0) | |
0f7e4c33 KK |
1024 | goto out; |
1025 | c1 = (c1 << 4) | c2; | |
1026 | } | |
1027 | *w++ = c1; | |
1028 | } while (c1 != '\0'); | |
1029 | ||
f50a3ec9 | 1030 | objname = namebuf; |
0f7e4c33 | 1031 | } |
1da177e4 | 1032 | |
0619f0f5 | 1033 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1034 | if (length) |
1035 | goto out; | |
1036 | ||
0619f0f5 | 1037 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1038 | if (length) |
1039 | goto out; | |
1da177e4 | 1040 | |
0619f0f5 SS |
1041 | length = security_transition_sid_user(state, ssid, tsid, tclass, |
1042 | objname, &newsid); | |
b77a493b EP |
1043 | if (length) |
1044 | goto out; | |
1da177e4 | 1045 | |
0619f0f5 | 1046 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1047 | if (length) |
1048 | goto out; | |
1da177e4 | 1049 | |
b77a493b | 1050 | length = -ERANGE; |
1da177e4 | 1051 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1052 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1053 | "payload max\n", __func__, len); |
b77a493b | 1054 | goto out; |
1da177e4 LT |
1055 | } |
1056 | ||
1057 | memcpy(buf, newcon, len); | |
1058 | length = len; | |
b77a493b | 1059 | out: |
1da177e4 | 1060 | kfree(newcon); |
f50a3ec9 | 1061 | kfree(namebuf); |
1da177e4 | 1062 | kfree(tcon); |
1da177e4 LT |
1063 | kfree(scon); |
1064 | return length; | |
1065 | } | |
1066 | ||
1872981b | 1067 | static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size) |
1da177e4 | 1068 | { |
0619f0f5 SS |
1069 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1070 | struct selinux_state *state = fsi->state; | |
b77a493b | 1071 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1072 | u32 ssid, tsid, newsid; |
1073 | u16 tclass; | |
1074 | ssize_t length; | |
b77a493b | 1075 | char *newcon = NULL; |
1da177e4 LT |
1076 | u32 len; |
1077 | ||
6b6bc620 SS |
1078 | length = avc_has_perm(&selinux_state, |
1079 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1080 | SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL, |
1081 | NULL); | |
1da177e4 | 1082 | if (length) |
b77a493b | 1083 | goto out; |
1da177e4 LT |
1084 | |
1085 | length = -ENOMEM; | |
c1a7368a | 1086 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1087 | if (!scon) |
b77a493b | 1088 | goto out; |
1da177e4 | 1089 | |
b77a493b | 1090 | length = -ENOMEM; |
c1a7368a | 1091 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1092 | if (!tcon) |
1093 | goto out; | |
1da177e4 LT |
1094 | |
1095 | length = -EINVAL; | |
1096 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1097 | goto out; |
1da177e4 | 1098 | |
0619f0f5 | 1099 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1100 | if (length) |
1101 | goto out; | |
1102 | ||
0619f0f5 | 1103 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1104 | if (length) |
1105 | goto out; | |
1da177e4 | 1106 | |
0619f0f5 | 1107 | length = security_change_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1108 | if (length) |
1109 | goto out; | |
1da177e4 | 1110 | |
0619f0f5 | 1111 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1112 | if (length) |
1113 | goto out; | |
1da177e4 | 1114 | |
b77a493b EP |
1115 | length = -ERANGE; |
1116 | if (len > SIMPLE_TRANSACTION_LIMIT) | |
1117 | goto out; | |
1da177e4 LT |
1118 | |
1119 | memcpy(buf, newcon, len); | |
1120 | length = len; | |
b77a493b | 1121 | out: |
1da177e4 | 1122 | kfree(newcon); |
1da177e4 | 1123 | kfree(tcon); |
1da177e4 LT |
1124 | kfree(scon); |
1125 | return length; | |
1126 | } | |
1127 | ||
1872981b | 1128 | static ssize_t sel_write_user(struct file *file, char *buf, size_t size) |
1da177e4 | 1129 | { |
0619f0f5 SS |
1130 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1131 | struct selinux_state *state = fsi->state; | |
b77a493b EP |
1132 | char *con = NULL, *user = NULL, *ptr; |
1133 | u32 sid, *sids = NULL; | |
1da177e4 LT |
1134 | ssize_t length; |
1135 | char *newcon; | |
1136 | int i, rc; | |
1137 | u32 len, nsids; | |
1138 | ||
6b6bc620 SS |
1139 | length = avc_has_perm(&selinux_state, |
1140 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1141 | SECCLASS_SECURITY, SECURITY__COMPUTE_USER, |
1142 | NULL); | |
1da177e4 | 1143 | if (length) |
6eab04a8 | 1144 | goto out; |
1da177e4 LT |
1145 | |
1146 | length = -ENOMEM; | |
c1a7368a | 1147 | con = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1148 | if (!con) |
6eab04a8 | 1149 | goto out; |
1da177e4 | 1150 | |
b77a493b | 1151 | length = -ENOMEM; |
c1a7368a | 1152 | user = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1153 | if (!user) |
1154 | goto out; | |
1da177e4 LT |
1155 | |
1156 | length = -EINVAL; | |
1157 | if (sscanf(buf, "%s %s", con, user) != 2) | |
b77a493b | 1158 | goto out; |
1da177e4 | 1159 | |
0619f0f5 | 1160 | length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL); |
b77a493b EP |
1161 | if (length) |
1162 | goto out; | |
1da177e4 | 1163 | |
0619f0f5 | 1164 | length = security_get_user_sids(state, sid, user, &sids, &nsids); |
b77a493b EP |
1165 | if (length) |
1166 | goto out; | |
1da177e4 LT |
1167 | |
1168 | length = sprintf(buf, "%u", nsids) + 1; | |
1169 | ptr = buf + length; | |
1170 | for (i = 0; i < nsids; i++) { | |
0619f0f5 | 1171 | rc = security_sid_to_context(state, sids[i], &newcon, &len); |
1da177e4 LT |
1172 | if (rc) { |
1173 | length = rc; | |
b77a493b | 1174 | goto out; |
1da177e4 LT |
1175 | } |
1176 | if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) { | |
1177 | kfree(newcon); | |
1178 | length = -ERANGE; | |
b77a493b | 1179 | goto out; |
1da177e4 LT |
1180 | } |
1181 | memcpy(ptr, newcon, len); | |
1182 | kfree(newcon); | |
1183 | ptr += len; | |
1184 | length += len; | |
1185 | } | |
b77a493b | 1186 | out: |
1da177e4 | 1187 | kfree(sids); |
1da177e4 | 1188 | kfree(user); |
1da177e4 LT |
1189 | kfree(con); |
1190 | return length; | |
1191 | } | |
1192 | ||
1872981b | 1193 | static ssize_t sel_write_member(struct file *file, char *buf, size_t size) |
1da177e4 | 1194 | { |
0619f0f5 SS |
1195 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1196 | struct selinux_state *state = fsi->state; | |
b77a493b | 1197 | char *scon = NULL, *tcon = NULL; |
1da177e4 LT |
1198 | u32 ssid, tsid, newsid; |
1199 | u16 tclass; | |
1200 | ssize_t length; | |
b77a493b | 1201 | char *newcon = NULL; |
1da177e4 LT |
1202 | u32 len; |
1203 | ||
6b6bc620 SS |
1204 | length = avc_has_perm(&selinux_state, |
1205 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1206 | SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER, |
1207 | NULL); | |
1da177e4 | 1208 | if (length) |
b77a493b | 1209 | goto out; |
1da177e4 LT |
1210 | |
1211 | length = -ENOMEM; | |
c1a7368a | 1212 | scon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 | 1213 | if (!scon) |
6eab04a8 | 1214 | goto out; |
1da177e4 | 1215 | |
b77a493b | 1216 | length = -ENOMEM; |
c1a7368a | 1217 | tcon = kzalloc(size + 1, GFP_KERNEL); |
1da177e4 LT |
1218 | if (!tcon) |
1219 | goto out; | |
1da177e4 LT |
1220 | |
1221 | length = -EINVAL; | |
1222 | if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3) | |
b77a493b | 1223 | goto out; |
1da177e4 | 1224 | |
0619f0f5 | 1225 | length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL); |
b77a493b EP |
1226 | if (length) |
1227 | goto out; | |
1228 | ||
0619f0f5 | 1229 | length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL); |
b77a493b EP |
1230 | if (length) |
1231 | goto out; | |
1da177e4 | 1232 | |
0619f0f5 | 1233 | length = security_member_sid(state, ssid, tsid, tclass, &newsid); |
b77a493b EP |
1234 | if (length) |
1235 | goto out; | |
1da177e4 | 1236 | |
0619f0f5 | 1237 | length = security_sid_to_context(state, newsid, &newcon, &len); |
b77a493b EP |
1238 | if (length) |
1239 | goto out; | |
1da177e4 | 1240 | |
b77a493b | 1241 | length = -ERANGE; |
1da177e4 | 1242 | if (len > SIMPLE_TRANSACTION_LIMIT) { |
f8b69a5f | 1243 | pr_err("SELinux: %s: context size (%u) exceeds " |
744ba35e | 1244 | "payload max\n", __func__, len); |
b77a493b | 1245 | goto out; |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | memcpy(buf, newcon, len); | |
1249 | length = len; | |
b77a493b | 1250 | out: |
1da177e4 | 1251 | kfree(newcon); |
1da177e4 | 1252 | kfree(tcon); |
1da177e4 LT |
1253 | kfree(scon); |
1254 | return length; | |
1255 | } | |
1256 | ||
1257 | static struct inode *sel_make_inode(struct super_block *sb, int mode) | |
1258 | { | |
1259 | struct inode *ret = new_inode(sb); | |
1260 | ||
1261 | if (ret) { | |
1262 | ret->i_mode = mode; | |
078cd827 | 1263 | ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret); |
1da177e4 LT |
1264 | } |
1265 | return ret; | |
1266 | } | |
1267 | ||
1da177e4 LT |
1268 | static ssize_t sel_read_bool(struct file *filep, char __user *buf, |
1269 | size_t count, loff_t *ppos) | |
1270 | { | |
0619f0f5 | 1271 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 LT |
1272 | char *page = NULL; |
1273 | ssize_t length; | |
1da177e4 LT |
1274 | ssize_t ret; |
1275 | int cur_enforcing; | |
496ad9aa | 1276 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1277 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1278 | |
9ff9abc4 | 1279 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1280 | |
b77a493b | 1281 | ret = -EINVAL; |
0619f0f5 SS |
1282 | if (index >= fsi->bool_num || strcmp(name, |
1283 | fsi->bool_pending_names[index])) | |
0da74120 | 1284 | goto out_unlock; |
1da177e4 | 1285 | |
b77a493b | 1286 | ret = -ENOMEM; |
1872981b | 1287 | page = (char *)get_zeroed_page(GFP_KERNEL); |
b77a493b | 1288 | if (!page) |
0da74120 | 1289 | goto out_unlock; |
1da177e4 | 1290 | |
0619f0f5 | 1291 | cur_enforcing = security_get_bool_value(fsi->state, index); |
1da177e4 LT |
1292 | if (cur_enforcing < 0) { |
1293 | ret = cur_enforcing; | |
0da74120 | 1294 | goto out_unlock; |
1da177e4 | 1295 | } |
1da177e4 | 1296 | length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing, |
0619f0f5 | 1297 | fsi->bool_pending_values[index]); |
9ff9abc4 | 1298 | mutex_unlock(&fsi->state->policy_mutex); |
0da74120 JH |
1299 | ret = simple_read_from_buffer(buf, count, ppos, page, length); |
1300 | out_free: | |
b77a493b | 1301 | free_page((unsigned long)page); |
1da177e4 | 1302 | return ret; |
0da74120 JH |
1303 | |
1304 | out_unlock: | |
9ff9abc4 | 1305 | mutex_unlock(&fsi->state->policy_mutex); |
0da74120 | 1306 | goto out_free; |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | static ssize_t sel_write_bool(struct file *filep, const char __user *buf, | |
1310 | size_t count, loff_t *ppos) | |
1311 | { | |
0619f0f5 | 1312 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1313 | char *page = NULL; |
d313f948 | 1314 | ssize_t length; |
1da177e4 | 1315 | int new_value; |
496ad9aa | 1316 | unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK; |
d313f948 | 1317 | const char *name = filep->f_path.dentry->d_name.name; |
1da177e4 | 1318 | |
0da74120 JH |
1319 | if (count >= PAGE_SIZE) |
1320 | return -ENOMEM; | |
1321 | ||
1322 | /* No partial writes. */ | |
1323 | if (*ppos != 0) | |
1324 | return -EINVAL; | |
1325 | ||
1326 | page = memdup_user_nul(buf, count); | |
1327 | if (IS_ERR(page)) | |
1328 | return PTR_ERR(page); | |
1329 | ||
9ff9abc4 | 1330 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1331 | |
6b6bc620 SS |
1332 | length = avc_has_perm(&selinux_state, |
1333 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1334 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1335 | NULL); | |
1da177e4 LT |
1336 | if (length) |
1337 | goto out; | |
1338 | ||
b77a493b | 1339 | length = -EINVAL; |
0619f0f5 SS |
1340 | if (index >= fsi->bool_num || strcmp(name, |
1341 | fsi->bool_pending_names[index])) | |
d313f948 | 1342 | goto out; |
d313f948 | 1343 | |
1da177e4 LT |
1344 | length = -EINVAL; |
1345 | if (sscanf(page, "%d", &new_value) != 1) | |
1346 | goto out; | |
1347 | ||
1348 | if (new_value) | |
1349 | new_value = 1; | |
1350 | ||
0619f0f5 | 1351 | fsi->bool_pending_values[index] = new_value; |
1da177e4 LT |
1352 | length = count; |
1353 | ||
1354 | out: | |
9ff9abc4 | 1355 | mutex_unlock(&fsi->state->policy_mutex); |
8365a719 | 1356 | kfree(page); |
1da177e4 LT |
1357 | return length; |
1358 | } | |
1359 | ||
9c2e08c5 | 1360 | static const struct file_operations sel_bool_ops = { |
1872981b EP |
1361 | .read = sel_read_bool, |
1362 | .write = sel_write_bool, | |
57a62c23 | 1363 | .llseek = generic_file_llseek, |
1da177e4 LT |
1364 | }; |
1365 | ||
1366 | static ssize_t sel_commit_bools_write(struct file *filep, | |
1367 | const char __user *buf, | |
1368 | size_t count, loff_t *ppos) | |
1369 | { | |
0619f0f5 | 1370 | struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info; |
1da177e4 | 1371 | char *page = NULL; |
d313f948 | 1372 | ssize_t length; |
1da177e4 LT |
1373 | int new_value; |
1374 | ||
0da74120 JH |
1375 | if (count >= PAGE_SIZE) |
1376 | return -ENOMEM; | |
1377 | ||
1378 | /* No partial writes. */ | |
1379 | if (*ppos != 0) | |
1380 | return -EINVAL; | |
1381 | ||
1382 | page = memdup_user_nul(buf, count); | |
1383 | if (IS_ERR(page)) | |
1384 | return PTR_ERR(page); | |
1385 | ||
9ff9abc4 | 1386 | mutex_lock(&fsi->state->policy_mutex); |
1da177e4 | 1387 | |
6b6bc620 SS |
1388 | length = avc_has_perm(&selinux_state, |
1389 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1390 | SECCLASS_SECURITY, SECURITY__SETBOOL, |
1391 | NULL); | |
1da177e4 LT |
1392 | if (length) |
1393 | goto out; | |
1394 | ||
1da177e4 LT |
1395 | length = -EINVAL; |
1396 | if (sscanf(page, "%d", &new_value) != 1) | |
1397 | goto out; | |
1398 | ||
b77a493b | 1399 | length = 0; |
0619f0f5 SS |
1400 | if (new_value && fsi->bool_pending_values) |
1401 | length = security_set_bools(fsi->state, fsi->bool_num, | |
1402 | fsi->bool_pending_values); | |
1da177e4 | 1403 | |
b77a493b EP |
1404 | if (!length) |
1405 | length = count; | |
1da177e4 LT |
1406 | |
1407 | out: | |
9ff9abc4 | 1408 | mutex_unlock(&fsi->state->policy_mutex); |
8365a719 | 1409 | kfree(page); |
1da177e4 LT |
1410 | return length; |
1411 | } | |
1412 | ||
9c2e08c5 | 1413 | static const struct file_operations sel_commit_bools_ops = { |
1872981b | 1414 | .write = sel_commit_bools_write, |
57a62c23 | 1415 | .llseek = generic_file_llseek, |
1da177e4 LT |
1416 | }; |
1417 | ||
0c92d7c7 | 1418 | static void sel_remove_entries(struct dentry *de) |
1da177e4 | 1419 | { |
ad52184b AV |
1420 | d_genocide(de); |
1421 | shrink_dcache_parent(de); | |
1da177e4 LT |
1422 | } |
1423 | ||
66ec384a DB |
1424 | static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir, |
1425 | unsigned int *bool_num, char ***bool_pending_names, | |
c3fae2b2 | 1426 | int **bool_pending_values) |
1da177e4 | 1427 | { |
60abd318 | 1428 | int ret; |
1da177e4 LT |
1429 | ssize_t len; |
1430 | struct dentry *dentry = NULL; | |
1da177e4 LT |
1431 | struct inode *inode = NULL; |
1432 | struct inode_security_struct *isec; | |
1433 | char **names = NULL, *page; | |
60abd318 | 1434 | u32 i, num; |
1da177e4 LT |
1435 | int *values = NULL; |
1436 | u32 sid; | |
1437 | ||
b77a493b | 1438 | ret = -ENOMEM; |
1872981b EP |
1439 | page = (char *)get_zeroed_page(GFP_KERNEL); |
1440 | if (!page) | |
b77a493b | 1441 | goto out; |
1da177e4 | 1442 | |
02a52c5c | 1443 | ret = security_get_bools(newpolicy, &num, &names, &values); |
b77a493b | 1444 | if (ret) |
1da177e4 LT |
1445 | goto out; |
1446 | ||
1447 | for (i = 0; i < num; i++) { | |
b77a493b | 1448 | ret = -ENOMEM; |
66ec384a | 1449 | dentry = d_alloc_name(bool_dir, names[i]); |
b77a493b EP |
1450 | if (!dentry) |
1451 | goto out; | |
1452 | ||
1453 | ret = -ENOMEM; | |
66ec384a | 1454 | inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR); |
7e4237fa | 1455 | if (!inode) { |
1456 | dput(dentry); | |
b77a493b | 1457 | goto out; |
7e4237fa | 1458 | } |
1da177e4 | 1459 | |
b77a493b | 1460 | ret = -ENAMETOOLONG; |
cc1dad71 | 1461 | len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]); |
7e4237fa | 1462 | if (len >= PAGE_SIZE) { |
1463 | dput(dentry); | |
1464 | iput(inode); | |
b77a493b | 1465 | goto out; |
7e4237fa | 1466 | } |
b77a493b | 1467 | |
80788c22 | 1468 | isec = selinux_inode(inode); |
02a52c5c | 1469 | ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page, |
aa8e712c | 1470 | SECCLASS_FILE, &sid); |
4262fb51 | 1471 | if (ret) { |
900fde06 GT |
1472 | pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n", |
1473 | page); | |
1474 | sid = SECINITSID_SECURITY; | |
4262fb51 GT |
1475 | } |
1476 | ||
1da177e4 | 1477 | isec->sid = sid; |
42059112 | 1478 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 | 1479 | inode->i_fop = &sel_bool_ops; |
bce34bc0 | 1480 | inode->i_ino = i|SEL_BOOL_INO_OFFSET; |
1da177e4 LT |
1481 | d_add(dentry, inode); |
1482 | } | |
66ec384a DB |
1483 | *bool_num = num; |
1484 | *bool_pending_names = names; | |
1485 | *bool_pending_values = values; | |
b77a493b EP |
1486 | |
1487 | free_page((unsigned long)page); | |
1488 | return 0; | |
1da177e4 LT |
1489 | out: |
1490 | free_page((unsigned long)page); | |
b77a493b | 1491 | |
1da177e4 | 1492 | if (names) { |
9a5f04bf JJ |
1493 | for (i = 0; i < num; i++) |
1494 | kfree(names[i]); | |
1da177e4 LT |
1495 | kfree(names); |
1496 | } | |
20c19e41 | 1497 | kfree(values); |
66ec384a | 1498 | sel_remove_entries(bool_dir); |
b77a493b EP |
1499 | |
1500 | return ret; | |
1da177e4 LT |
1501 | } |
1502 | ||
1da177e4 LT |
1503 | static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf, |
1504 | size_t count, loff_t *ppos) | |
1505 | { | |
6b6bc620 SS |
1506 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1507 | struct selinux_state *state = fsi->state; | |
1da177e4 LT |
1508 | char tmpbuf[TMPBUFLEN]; |
1509 | ssize_t length; | |
1510 | ||
6b6bc620 SS |
1511 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
1512 | avc_get_cache_threshold(state->avc)); | |
1da177e4 LT |
1513 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1514 | } | |
1515 | ||
1872981b EP |
1516 | static ssize_t sel_write_avc_cache_threshold(struct file *file, |
1517 | const char __user *buf, | |
1da177e4 LT |
1518 | size_t count, loff_t *ppos) |
1519 | ||
1520 | { | |
6b6bc620 SS |
1521 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
1522 | struct selinux_state *state = fsi->state; | |
8365a719 | 1523 | char *page; |
1da177e4 | 1524 | ssize_t ret; |
309c5fad | 1525 | unsigned int new_value; |
1da177e4 | 1526 | |
6b6bc620 SS |
1527 | ret = avc_has_perm(&selinux_state, |
1528 | current_sid(), SECINITSID_SECURITY, | |
be0554c9 SS |
1529 | SECCLASS_SECURITY, SECURITY__SETSECPARAM, |
1530 | NULL); | |
b77a493b | 1531 | if (ret) |
8365a719 | 1532 | return ret; |
1da177e4 | 1533 | |
b77a493b | 1534 | if (count >= PAGE_SIZE) |
8365a719 | 1535 | return -ENOMEM; |
1da177e4 | 1536 | |
b77a493b | 1537 | /* No partial writes. */ |
b77a493b | 1538 | if (*ppos != 0) |
8365a719 | 1539 | return -EINVAL; |
1da177e4 | 1540 | |
8365a719 AV |
1541 | page = memdup_user_nul(buf, count); |
1542 | if (IS_ERR(page)) | |
1543 | return PTR_ERR(page); | |
1da177e4 | 1544 | |
b77a493b EP |
1545 | ret = -EINVAL; |
1546 | if (sscanf(page, "%u", &new_value) != 1) | |
1da177e4 | 1547 | goto out; |
1da177e4 | 1548 | |
6b6bc620 | 1549 | avc_set_cache_threshold(state->avc, new_value); |
b77a493b | 1550 | |
1da177e4 | 1551 | ret = count; |
1da177e4 | 1552 | out: |
8365a719 | 1553 | kfree(page); |
1da177e4 LT |
1554 | return ret; |
1555 | } | |
1556 | ||
1557 | static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf, | |
1558 | size_t count, loff_t *ppos) | |
1559 | { | |
6b6bc620 SS |
1560 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; |
1561 | struct selinux_state *state = fsi->state; | |
1da177e4 | 1562 | char *page; |
b77a493b | 1563 | ssize_t length; |
1da177e4 LT |
1564 | |
1565 | page = (char *)__get_free_page(GFP_KERNEL); | |
b77a493b EP |
1566 | if (!page) |
1567 | return -ENOMEM; | |
1568 | ||
6b6bc620 | 1569 | length = avc_get_hash_stats(state->avc, page); |
b77a493b EP |
1570 | if (length >= 0) |
1571 | length = simple_read_from_buffer(buf, count, ppos, page, length); | |
1da177e4 | 1572 | free_page((unsigned long)page); |
b77a493b EP |
1573 | |
1574 | return length; | |
1da177e4 LT |
1575 | } |
1576 | ||
66f8e2f0 JVS |
1577 | static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf, |
1578 | size_t count, loff_t *ppos) | |
1579 | { | |
1580 | struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info; | |
1581 | struct selinux_state *state = fsi->state; | |
1582 | char *page; | |
1583 | ssize_t length; | |
1584 | ||
1585 | page = (char *)__get_free_page(GFP_KERNEL); | |
1586 | if (!page) | |
1587 | return -ENOMEM; | |
1588 | ||
1589 | length = security_sidtab_hash_stats(state, page); | |
1590 | if (length >= 0) | |
1591 | length = simple_read_from_buffer(buf, count, ppos, page, | |
1592 | length); | |
1593 | free_page((unsigned long)page); | |
1594 | ||
1595 | return length; | |
1596 | } | |
1597 | ||
1598 | static const struct file_operations sel_sidtab_hash_stats_ops = { | |
1599 | .read = sel_read_sidtab_hash_stats, | |
1600 | .llseek = generic_file_llseek, | |
1601 | }; | |
1602 | ||
9c2e08c5 | 1603 | static const struct file_operations sel_avc_cache_threshold_ops = { |
1da177e4 LT |
1604 | .read = sel_read_avc_cache_threshold, |
1605 | .write = sel_write_avc_cache_threshold, | |
57a62c23 | 1606 | .llseek = generic_file_llseek, |
1da177e4 LT |
1607 | }; |
1608 | ||
9c2e08c5 | 1609 | static const struct file_operations sel_avc_hash_stats_ops = { |
1da177e4 | 1610 | .read = sel_read_avc_hash_stats, |
57a62c23 | 1611 | .llseek = generic_file_llseek, |
1da177e4 LT |
1612 | }; |
1613 | ||
1614 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1615 | static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx) | |
1616 | { | |
1617 | int cpu; | |
1618 | ||
4f4b6c1a | 1619 | for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
1620 | if (!cpu_possible(cpu)) |
1621 | continue; | |
1622 | *idx = cpu + 1; | |
1623 | return &per_cpu(avc_cache_stats, cpu); | |
1624 | } | |
8d269a8e | 1625 | (*idx)++; |
1da177e4 LT |
1626 | return NULL; |
1627 | } | |
1628 | ||
1629 | static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos) | |
1630 | { | |
1631 | loff_t n = *pos - 1; | |
1632 | ||
1633 | if (*pos == 0) | |
1634 | return SEQ_START_TOKEN; | |
1635 | ||
1636 | return sel_avc_get_stat_idx(&n); | |
1637 | } | |
1638 | ||
1639 | static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1640 | { | |
1641 | return sel_avc_get_stat_idx(pos); | |
1642 | } | |
1643 | ||
1644 | static int sel_avc_stats_seq_show(struct seq_file *seq, void *v) | |
1645 | { | |
1646 | struct avc_cache_stats *st = v; | |
1647 | ||
710a0647 ME |
1648 | if (v == SEQ_START_TOKEN) { |
1649 | seq_puts(seq, | |
1650 | "lookups hits misses allocations reclaims frees\n"); | |
1651 | } else { | |
257313b2 LT |
1652 | unsigned int lookups = st->lookups; |
1653 | unsigned int misses = st->misses; | |
1654 | unsigned int hits = lookups - misses; | |
1655 | seq_printf(seq, "%u %u %u %u %u %u\n", lookups, | |
1656 | hits, misses, st->allocations, | |
1da177e4 | 1657 | st->reclaims, st->frees); |
257313b2 | 1658 | } |
1da177e4 LT |
1659 | return 0; |
1660 | } | |
1661 | ||
1662 | static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v) | |
1663 | { } | |
1664 | ||
1996a109 | 1665 | static const struct seq_operations sel_avc_cache_stats_seq_ops = { |
1da177e4 LT |
1666 | .start = sel_avc_stats_seq_start, |
1667 | .next = sel_avc_stats_seq_next, | |
1668 | .show = sel_avc_stats_seq_show, | |
1669 | .stop = sel_avc_stats_seq_stop, | |
1670 | }; | |
1671 | ||
1672 | static int sel_open_avc_cache_stats(struct inode *inode, struct file *file) | |
1673 | { | |
1674 | return seq_open(file, &sel_avc_cache_stats_seq_ops); | |
1675 | } | |
1676 | ||
9c2e08c5 | 1677 | static const struct file_operations sel_avc_cache_stats_ops = { |
1da177e4 LT |
1678 | .open = sel_open_avc_cache_stats, |
1679 | .read = seq_read, | |
1680 | .llseek = seq_lseek, | |
1681 | .release = seq_release, | |
1682 | }; | |
1683 | #endif | |
1684 | ||
1685 | static int sel_make_avc_files(struct dentry *dir) | |
1686 | { | |
0619f0f5 SS |
1687 | struct super_block *sb = dir->d_sb; |
1688 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
b77a493b | 1689 | int i; |
cda37124 | 1690 | static const struct tree_descr files[] = { |
1da177e4 LT |
1691 | { "cache_threshold", |
1692 | &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR }, | |
1693 | { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO }, | |
1694 | #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS | |
1695 | { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO }, | |
1696 | #endif | |
1697 | }; | |
1698 | ||
6e20a64a | 1699 | for (i = 0; i < ARRAY_SIZE(files); i++) { |
1da177e4 LT |
1700 | struct inode *inode; |
1701 | struct dentry *dentry; | |
1702 | ||
1703 | dentry = d_alloc_name(dir, files[i].name); | |
b77a493b EP |
1704 | if (!dentry) |
1705 | return -ENOMEM; | |
1da177e4 LT |
1706 | |
1707 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
7e4237fa | 1708 | if (!inode) { |
1709 | dput(dentry); | |
b77a493b | 1710 | return -ENOMEM; |
7e4237fa | 1711 | } |
b77a493b | 1712 | |
1da177e4 | 1713 | inode->i_fop = files[i].ops; |
0619f0f5 | 1714 | inode->i_ino = ++fsi->last_ino; |
1da177e4 LT |
1715 | d_add(dentry, inode); |
1716 | } | |
b77a493b EP |
1717 | |
1718 | return 0; | |
1da177e4 LT |
1719 | } |
1720 | ||
66f8e2f0 JVS |
1721 | static int sel_make_ss_files(struct dentry *dir) |
1722 | { | |
1723 | struct super_block *sb = dir->d_sb; | |
1724 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
1725 | int i; | |
1726 | static struct tree_descr files[] = { | |
1727 | { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO }, | |
1728 | }; | |
1729 | ||
1730 | for (i = 0; i < ARRAY_SIZE(files); i++) { | |
1731 | struct inode *inode; | |
1732 | struct dentry *dentry; | |
1733 | ||
1734 | dentry = d_alloc_name(dir, files[i].name); | |
1735 | if (!dentry) | |
1736 | return -ENOMEM; | |
1737 | ||
1738 | inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode); | |
1739 | if (!inode) { | |
1740 | dput(dentry); | |
1741 | return -ENOMEM; | |
1742 | } | |
1743 | ||
1744 | inode->i_fop = files[i].ops; | |
1745 | inode->i_ino = ++fsi->last_ino; | |
1746 | d_add(dentry, inode); | |
1747 | } | |
1748 | ||
1749 | return 0; | |
1750 | } | |
1751 | ||
1872981b | 1752 | static ssize_t sel_read_initcon(struct file *file, char __user *buf, |
f0ee2e46 JC |
1753 | size_t count, loff_t *ppos) |
1754 | { | |
0619f0f5 | 1755 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
f0ee2e46 JC |
1756 | char *con; |
1757 | u32 sid, len; | |
1758 | ssize_t ret; | |
1759 | ||
496ad9aa | 1760 | sid = file_inode(file)->i_ino&SEL_INO_MASK; |
0619f0f5 | 1761 | ret = security_sid_to_context(fsi->state, sid, &con, &len); |
b77a493b | 1762 | if (ret) |
f0ee2e46 JC |
1763 | return ret; |
1764 | ||
1765 | ret = simple_read_from_buffer(buf, count, ppos, con, len); | |
1766 | kfree(con); | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | static const struct file_operations sel_initcon_ops = { | |
1771 | .read = sel_read_initcon, | |
57a62c23 | 1772 | .llseek = generic_file_llseek, |
f0ee2e46 JC |
1773 | }; |
1774 | ||
1775 | static int sel_make_initcon_files(struct dentry *dir) | |
1776 | { | |
b77a493b | 1777 | int i; |
f0ee2e46 JC |
1778 | |
1779 | for (i = 1; i <= SECINITSID_NUM; i++) { | |
1780 | struct inode *inode; | |
1781 | struct dentry *dentry; | |
e3e0b582 SS |
1782 | const char *s = security_get_initial_sid_context(i); |
1783 | ||
1784 | if (!s) | |
1785 | continue; | |
1786 | dentry = d_alloc_name(dir, s); | |
b77a493b EP |
1787 | if (!dentry) |
1788 | return -ENOMEM; | |
f0ee2e46 JC |
1789 | |
1790 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1791 | if (!inode) { |
1792 | dput(dentry); | |
b77a493b | 1793 | return -ENOMEM; |
7e4237fa | 1794 | } |
b77a493b | 1795 | |
f0ee2e46 JC |
1796 | inode->i_fop = &sel_initcon_ops; |
1797 | inode->i_ino = i|SEL_INITCON_INO_OFFSET; | |
1798 | d_add(dentry, inode); | |
1799 | } | |
b77a493b EP |
1800 | |
1801 | return 0; | |
f0ee2e46 JC |
1802 | } |
1803 | ||
e47c8fc5 CP |
1804 | static inline unsigned long sel_class_to_ino(u16 class) |
1805 | { | |
1806 | return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET; | |
1807 | } | |
1808 | ||
1809 | static inline u16 sel_ino_to_class(unsigned long ino) | |
1810 | { | |
92ae9e82 | 1811 | return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1); |
e47c8fc5 CP |
1812 | } |
1813 | ||
1814 | static inline unsigned long sel_perm_to_ino(u16 class, u32 perm) | |
1815 | { | |
1816 | return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET; | |
1817 | } | |
1818 | ||
1819 | static inline u32 sel_ino_to_perm(unsigned long ino) | |
1820 | { | |
1821 | return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1); | |
1822 | } | |
1823 | ||
1872981b | 1824 | static ssize_t sel_read_class(struct file *file, char __user *buf, |
e47c8fc5 CP |
1825 | size_t count, loff_t *ppos) |
1826 | { | |
496ad9aa | 1827 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1828 | char res[TMPBUFLEN]; |
7e78c875 | 1829 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino)); |
cc1dad71 | 1830 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1831 | } |
1832 | ||
1833 | static const struct file_operations sel_class_ops = { | |
1834 | .read = sel_read_class, | |
57a62c23 | 1835 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1836 | }; |
1837 | ||
1872981b | 1838 | static ssize_t sel_read_perm(struct file *file, char __user *buf, |
e47c8fc5 CP |
1839 | size_t count, loff_t *ppos) |
1840 | { | |
496ad9aa | 1841 | unsigned long ino = file_inode(file)->i_ino; |
cc1dad71 | 1842 | char res[TMPBUFLEN]; |
7e78c875 | 1843 | ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino)); |
cc1dad71 | 1844 | return simple_read_from_buffer(buf, count, ppos, res, len); |
e47c8fc5 CP |
1845 | } |
1846 | ||
1847 | static const struct file_operations sel_perm_ops = { | |
1848 | .read = sel_read_perm, | |
57a62c23 | 1849 | .llseek = generic_file_llseek, |
e47c8fc5 CP |
1850 | }; |
1851 | ||
3bb56b25 PM |
1852 | static ssize_t sel_read_policycap(struct file *file, char __user *buf, |
1853 | size_t count, loff_t *ppos) | |
1854 | { | |
0619f0f5 | 1855 | struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info; |
3bb56b25 PM |
1856 | int value; |
1857 | char tmpbuf[TMPBUFLEN]; | |
1858 | ssize_t length; | |
496ad9aa | 1859 | unsigned long i_ino = file_inode(file)->i_ino; |
3bb56b25 | 1860 | |
0619f0f5 | 1861 | value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK); |
3bb56b25 PM |
1862 | length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value); |
1863 | ||
1864 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1865 | } | |
1866 | ||
1867 | static const struct file_operations sel_policycap_ops = { | |
1868 | .read = sel_read_policycap, | |
57a62c23 | 1869 | .llseek = generic_file_llseek, |
3bb56b25 PM |
1870 | }; |
1871 | ||
02a52c5c SS |
1872 | static int sel_make_perm_files(struct selinux_policy *newpolicy, |
1873 | char *objclass, int classvalue, | |
1874 | struct dentry *dir) | |
e47c8fc5 | 1875 | { |
b77a493b | 1876 | int i, rc, nperms; |
e47c8fc5 CP |
1877 | char **perms; |
1878 | ||
02a52c5c | 1879 | rc = security_get_permissions(newpolicy, objclass, &perms, &nperms); |
e47c8fc5 | 1880 | if (rc) |
b77a493b | 1881 | return rc; |
e47c8fc5 CP |
1882 | |
1883 | for (i = 0; i < nperms; i++) { | |
1884 | struct inode *inode; | |
1885 | struct dentry *dentry; | |
1886 | ||
b77a493b | 1887 | rc = -ENOMEM; |
e47c8fc5 | 1888 | dentry = d_alloc_name(dir, perms[i]); |
b77a493b EP |
1889 | if (!dentry) |
1890 | goto out; | |
e47c8fc5 | 1891 | |
b77a493b | 1892 | rc = -ENOMEM; |
e47c8fc5 | 1893 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); |
7e4237fa | 1894 | if (!inode) { |
1895 | dput(dentry); | |
b77a493b | 1896 | goto out; |
7e4237fa | 1897 | } |
b77a493b | 1898 | |
e47c8fc5 CP |
1899 | inode->i_fop = &sel_perm_ops; |
1900 | /* i+1 since perm values are 1-indexed */ | |
c1a7368a | 1901 | inode->i_ino = sel_perm_to_ino(classvalue, i + 1); |
e47c8fc5 CP |
1902 | d_add(dentry, inode); |
1903 | } | |
b77a493b EP |
1904 | rc = 0; |
1905 | out: | |
e47c8fc5 CP |
1906 | for (i = 0; i < nperms; i++) |
1907 | kfree(perms[i]); | |
1908 | kfree(perms); | |
e47c8fc5 CP |
1909 | return rc; |
1910 | } | |
1911 | ||
02a52c5c SS |
1912 | static int sel_make_class_dir_entries(struct selinux_policy *newpolicy, |
1913 | char *classname, int index, | |
1914 | struct dentry *dir) | |
e47c8fc5 | 1915 | { |
0619f0f5 SS |
1916 | struct super_block *sb = dir->d_sb; |
1917 | struct selinux_fs_info *fsi = sb->s_fs_info; | |
e47c8fc5 CP |
1918 | struct dentry *dentry = NULL; |
1919 | struct inode *inode = NULL; | |
e47c8fc5 CP |
1920 | |
1921 | dentry = d_alloc_name(dir, "index"); | |
b77a493b EP |
1922 | if (!dentry) |
1923 | return -ENOMEM; | |
e47c8fc5 CP |
1924 | |
1925 | inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO); | |
7e4237fa | 1926 | if (!inode) { |
1927 | dput(dentry); | |
b77a493b | 1928 | return -ENOMEM; |
7e4237fa | 1929 | } |
e47c8fc5 CP |
1930 | |
1931 | inode->i_fop = &sel_class_ops; | |
1932 | inode->i_ino = sel_class_to_ino(index); | |
1933 | d_add(dentry, inode); | |
1934 | ||
0619f0f5 | 1935 | dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino); |
a1c2aa1e AV |
1936 | if (IS_ERR(dentry)) |
1937 | return PTR_ERR(dentry); | |
e47c8fc5 | 1938 | |
5698f081 | 1939 | return sel_make_perm_files(newpolicy, classname, index, dentry); |
e47c8fc5 CP |
1940 | } |
1941 | ||
66ec384a DB |
1942 | static int sel_make_classes(struct selinux_policy *newpolicy, |
1943 | struct dentry *class_dir, | |
1944 | unsigned long *last_class_ino) | |
e47c8fc5 | 1945 | { |
0619f0f5 | 1946 | |
b77a493b | 1947 | int rc, nclasses, i; |
e47c8fc5 CP |
1948 | char **classes; |
1949 | ||
02a52c5c | 1950 | rc = security_get_classes(newpolicy, &classes, &nclasses); |
b77a493b EP |
1951 | if (rc) |
1952 | return rc; | |
e47c8fc5 CP |
1953 | |
1954 | /* +2 since classes are 1-indexed */ | |
66ec384a | 1955 | *last_class_ino = sel_class_to_ino(nclasses + 2); |
e47c8fc5 CP |
1956 | |
1957 | for (i = 0; i < nclasses; i++) { | |
1958 | struct dentry *class_name_dir; | |
1959 | ||
66ec384a DB |
1960 | class_name_dir = sel_make_dir(class_dir, classes[i], |
1961 | last_class_ino); | |
a1c2aa1e AV |
1962 | if (IS_ERR(class_name_dir)) { |
1963 | rc = PTR_ERR(class_name_dir); | |
b77a493b | 1964 | goto out; |
a1c2aa1e | 1965 | } |
e47c8fc5 CP |
1966 | |
1967 | /* i+1 since class values are 1-indexed */ | |
02a52c5c | 1968 | rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1, |
e47c8fc5 CP |
1969 | class_name_dir); |
1970 | if (rc) | |
b77a493b | 1971 | goto out; |
e47c8fc5 | 1972 | } |
b77a493b EP |
1973 | rc = 0; |
1974 | out: | |
e47c8fc5 CP |
1975 | for (i = 0; i < nclasses; i++) |
1976 | kfree(classes[i]); | |
1977 | kfree(classes); | |
e47c8fc5 CP |
1978 | return rc; |
1979 | } | |
1980 | ||
0619f0f5 | 1981 | static int sel_make_policycap(struct selinux_fs_info *fsi) |
3bb56b25 PM |
1982 | { |
1983 | unsigned int iter; | |
1984 | struct dentry *dentry = NULL; | |
1985 | struct inode *inode = NULL; | |
1986 | ||
cdbec3ed | 1987 | for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) { |
4dc2fce3 | 1988 | if (iter < ARRAY_SIZE(selinux_policycap_names)) |
0619f0f5 | 1989 | dentry = d_alloc_name(fsi->policycap_dir, |
4dc2fce3 | 1990 | selinux_policycap_names[iter]); |
3bb56b25 | 1991 | else |
0619f0f5 | 1992 | dentry = d_alloc_name(fsi->policycap_dir, "unknown"); |
3bb56b25 PM |
1993 | |
1994 | if (dentry == NULL) | |
1995 | return -ENOMEM; | |
1996 | ||
0619f0f5 | 1997 | inode = sel_make_inode(fsi->sb, S_IFREG | 0444); |
7e4237fa | 1998 | if (inode == NULL) { |
1999 | dput(dentry); | |
3bb56b25 | 2000 | return -ENOMEM; |
7e4237fa | 2001 | } |
3bb56b25 PM |
2002 | |
2003 | inode->i_fop = &sel_policycap_ops; | |
2004 | inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET; | |
2005 | d_add(dentry, inode); | |
2006 | } | |
2007 | ||
2008 | return 0; | |
2009 | } | |
2010 | ||
a1c2aa1e | 2011 | static struct dentry *sel_make_dir(struct dentry *dir, const char *name, |
0dd4ae51 | 2012 | unsigned long *ino) |
1da177e4 | 2013 | { |
a1c2aa1e | 2014 | struct dentry *dentry = d_alloc_name(dir, name); |
1da177e4 LT |
2015 | struct inode *inode; |
2016 | ||
a1c2aa1e AV |
2017 | if (!dentry) |
2018 | return ERR_PTR(-ENOMEM); | |
2019 | ||
2020 | inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
2021 | if (!inode) { | |
2022 | dput(dentry); | |
2023 | return ERR_PTR(-ENOMEM); | |
2024 | } | |
b77a493b | 2025 | |
1da177e4 LT |
2026 | inode->i_op = &simple_dir_inode_operations; |
2027 | inode->i_fop = &simple_dir_operations; | |
0dd4ae51 | 2028 | inode->i_ino = ++(*ino); |
40e906f8 | 2029 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ |
d8c76e6f | 2030 | inc_nlink(inode); |
1da177e4 | 2031 | d_add(dentry, inode); |
edb20fb5 | 2032 | /* bump link count on parent directory, too */ |
ce0b16dd | 2033 | inc_nlink(d_inode(dir)); |
b77a493b | 2034 | |
a1c2aa1e | 2035 | return dentry; |
1da177e4 LT |
2036 | } |
2037 | ||
0eea6091 DB |
2038 | static struct dentry *sel_make_disconnected_dir(struct super_block *sb, |
2039 | unsigned long *ino) | |
2040 | { | |
2041 | struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO); | |
2042 | ||
2043 | if (!inode) | |
2044 | return ERR_PTR(-ENOMEM); | |
2045 | ||
2046 | inode->i_op = &simple_dir_inode_operations; | |
2047 | inode->i_fop = &simple_dir_operations; | |
2048 | inode->i_ino = ++(*ino); | |
2049 | /* directory inodes start off with i_nlink == 2 (for "." entry) */ | |
2050 | inc_nlink(inode); | |
2051 | return d_obtain_alias(inode); | |
2052 | } | |
2053 | ||
0619f0f5 SS |
2054 | #define NULL_FILE_NAME "null" |
2055 | ||
920f50b2 | 2056 | static int sel_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 2057 | { |
0619f0f5 | 2058 | struct selinux_fs_info *fsi; |
1da177e4 LT |
2059 | int ret; |
2060 | struct dentry *dentry; | |
a1c2aa1e | 2061 | struct inode *inode; |
1da177e4 LT |
2062 | struct inode_security_struct *isec; |
2063 | ||
cda37124 | 2064 | static const struct tree_descr selinux_files[] = { |
1da177e4 LT |
2065 | [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR}, |
2066 | [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR}, | |
ce9982d0 | 2067 | [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO}, |
1da177e4 LT |
2068 | [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO}, |
2069 | [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2070 | [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2071 | [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2072 | [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO}, | |
2073 | [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR}, | |
2074 | [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO}, | |
2075 | [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR}, | |
2076 | [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO}, | |
2077 | [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR}, | |
3f12070e EP |
2078 | [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO}, |
2079 | [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO}, | |
11904167 | 2080 | [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO}, |
72e8c859 | 2081 | [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO}, |
f9df6458 AP |
2082 | [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops, |
2083 | S_IWUGO}, | |
1da177e4 LT |
2084 | /* last one */ {""} |
2085 | }; | |
0619f0f5 SS |
2086 | |
2087 | ret = selinux_fs_info_create(sb); | |
2088 | if (ret) | |
2089 | goto err; | |
2090 | ||
1da177e4 LT |
2091 | ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files); |
2092 | if (ret) | |
161ce45a | 2093 | goto err; |
1da177e4 | 2094 | |
0619f0f5 SS |
2095 | fsi = sb->s_fs_info; |
2096 | fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino); | |
2097 | if (IS_ERR(fsi->bool_dir)) { | |
2098 | ret = PTR_ERR(fsi->bool_dir); | |
2099 | fsi->bool_dir = NULL; | |
161ce45a | 2100 | goto err; |
a1c2aa1e | 2101 | } |
1da177e4 | 2102 | |
b77a493b | 2103 | ret = -ENOMEM; |
1da177e4 | 2104 | dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME); |
b77a493b | 2105 | if (!dentry) |
161ce45a | 2106 | goto err; |
1da177e4 | 2107 | |
b77a493b | 2108 | ret = -ENOMEM; |
1da177e4 | 2109 | inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO); |
7e4237fa | 2110 | if (!inode) { |
2111 | dput(dentry); | |
161ce45a | 2112 | goto err; |
7e4237fa | 2113 | } |
b77a493b | 2114 | |
0619f0f5 | 2115 | inode->i_ino = ++fsi->last_ino; |
80788c22 | 2116 | isec = selinux_inode(inode); |
1da177e4 LT |
2117 | isec->sid = SECINITSID_DEVNULL; |
2118 | isec->sclass = SECCLASS_CHR_FILE; | |
42059112 | 2119 | isec->initialized = LABEL_INITIALIZED; |
1da177e4 LT |
2120 | |
2121 | init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3)); | |
2122 | d_add(dentry, inode); | |
1da177e4 | 2123 | |
0619f0f5 | 2124 | dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino); |
a1c2aa1e AV |
2125 | if (IS_ERR(dentry)) { |
2126 | ret = PTR_ERR(dentry); | |
161ce45a | 2127 | goto err; |
a1c2aa1e | 2128 | } |
1da177e4 LT |
2129 | |
2130 | ret = sel_make_avc_files(dentry); | |
bcb62828 CG |
2131 | if (ret) |
2132 | goto err; | |
66f8e2f0 JVS |
2133 | |
2134 | dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino); | |
2135 | if (IS_ERR(dentry)) { | |
2136 | ret = PTR_ERR(dentry); | |
2137 | goto err; | |
2138 | } | |
2139 | ||
2140 | ret = sel_make_ss_files(dentry); | |
1da177e4 | 2141 | if (ret) |
161ce45a | 2142 | goto err; |
f0ee2e46 | 2143 | |
0619f0f5 | 2144 | dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino); |
a1c2aa1e AV |
2145 | if (IS_ERR(dentry)) { |
2146 | ret = PTR_ERR(dentry); | |
f0ee2e46 | 2147 | goto err; |
a1c2aa1e | 2148 | } |
f0ee2e46 JC |
2149 | |
2150 | ret = sel_make_initcon_files(dentry); | |
2151 | if (ret) | |
2152 | goto err; | |
2153 | ||
613ba187 | 2154 | fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino); |
0619f0f5 SS |
2155 | if (IS_ERR(fsi->class_dir)) { |
2156 | ret = PTR_ERR(fsi->class_dir); | |
2157 | fsi->class_dir = NULL; | |
3bb56b25 | 2158 | goto err; |
a1c2aa1e | 2159 | } |
3bb56b25 | 2160 | |
613ba187 | 2161 | fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME, |
0619f0f5 SS |
2162 | &fsi->last_ino); |
2163 | if (IS_ERR(fsi->policycap_dir)) { | |
2164 | ret = PTR_ERR(fsi->policycap_dir); | |
2165 | fsi->policycap_dir = NULL; | |
3bb56b25 | 2166 | goto err; |
a1c2aa1e | 2167 | } |
0619f0f5 | 2168 | |
02a52c5c SS |
2169 | ret = sel_make_policycap(fsi); |
2170 | if (ret) { | |
2171 | pr_err("SELinux: failed to load policy capabilities\n"); | |
0619f0f5 | 2172 | goto err; |
02a52c5c SS |
2173 | } |
2174 | ||
b77a493b | 2175 | return 0; |
161ce45a | 2176 | err: |
f8b69a5f | 2177 | pr_err("SELinux: %s: failed while creating inodes\n", |
744ba35e | 2178 | __func__); |
0619f0f5 SS |
2179 | |
2180 | selinux_fs_info_free(sb); | |
2181 | ||
b77a493b | 2182 | return ret; |
1da177e4 LT |
2183 | } |
2184 | ||
920f50b2 | 2185 | static int sel_get_tree(struct fs_context *fc) |
1da177e4 | 2186 | { |
920f50b2 DH |
2187 | return get_tree_single(fc, sel_fill_super); |
2188 | } | |
2189 | ||
2190 | static const struct fs_context_operations sel_context_ops = { | |
2191 | .get_tree = sel_get_tree, | |
2192 | }; | |
2193 | ||
2194 | static int sel_init_fs_context(struct fs_context *fc) | |
2195 | { | |
2196 | fc->ops = &sel_context_ops; | |
2197 | return 0; | |
1da177e4 LT |
2198 | } |
2199 | ||
0619f0f5 SS |
2200 | static void sel_kill_sb(struct super_block *sb) |
2201 | { | |
2202 | selinux_fs_info_free(sb); | |
2203 | kill_litter_super(sb); | |
2204 | } | |
2205 | ||
1da177e4 LT |
2206 | static struct file_system_type sel_fs_type = { |
2207 | .name = "selinuxfs", | |
920f50b2 | 2208 | .init_fs_context = sel_init_fs_context, |
0619f0f5 | 2209 | .kill_sb = sel_kill_sb, |
1da177e4 LT |
2210 | }; |
2211 | ||
cd2bb4cb OM |
2212 | static struct vfsmount *selinuxfs_mount __ro_after_init; |
2213 | struct path selinux_null __ro_after_init; | |
1da177e4 LT |
2214 | |
2215 | static int __init init_sel_fs(void) | |
2216 | { | |
0619f0f5 SS |
2217 | struct qstr null_name = QSTR_INIT(NULL_FILE_NAME, |
2218 | sizeof(NULL_FILE_NAME)-1); | |
1da177e4 LT |
2219 | int err; |
2220 | ||
6c5a682e | 2221 | if (!selinux_enabled_boot) |
1da177e4 | 2222 | return 0; |
7a627e3b | 2223 | |
f9bb4882 EB |
2224 | err = sysfs_create_mount_point(fs_kobj, "selinux"); |
2225 | if (err) | |
2226 | return err; | |
7a627e3b | 2227 | |
1da177e4 | 2228 | err = register_filesystem(&sel_fs_type); |
7a627e3b | 2229 | if (err) { |
f9bb4882 | 2230 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
b77a493b | 2231 | return err; |
7a627e3b | 2232 | } |
b77a493b | 2233 | |
765927b2 | 2234 | selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type); |
b77a493b | 2235 | if (IS_ERR(selinuxfs_mount)) { |
f8b69a5f | 2236 | pr_err("selinuxfs: could not mount!\n"); |
b77a493b EP |
2237 | err = PTR_ERR(selinuxfs_mount); |
2238 | selinuxfs_mount = NULL; | |
1da177e4 | 2239 | } |
0619f0f5 SS |
2240 | selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root, |
2241 | &null_name); | |
2242 | if (IS_ERR(selinux_null.dentry)) { | |
2243 | pr_err("selinuxfs: could not lookup null!\n"); | |
2244 | err = PTR_ERR(selinux_null.dentry); | |
2245 | selinux_null.dentry = NULL; | |
2246 | } | |
b77a493b | 2247 | |
1da177e4 LT |
2248 | return err; |
2249 | } | |
2250 | ||
2251 | __initcall(init_sel_fs); | |
2252 | ||
2253 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
2254 | void exit_sel_fs(void) | |
2255 | { | |
f9bb4882 | 2256 | sysfs_remove_mount_point(fs_kobj, "selinux"); |
fd40ffc7 | 2257 | dput(selinux_null.dentry); |
423e0ab0 | 2258 | kern_unmount(selinuxfs_mount); |
1da177e4 LT |
2259 | unregister_filesystem(&sel_fs_type); |
2260 | } | |
2261 | #endif |