1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
4 * Added conditional policy language extensions
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
8 * Added support for the policy capability bitmap
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
15 #include <linux/kernel.h>
16 #include <linux/pagemap.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
20 #include <linux/fs_context.h>
21 #include <linux/mount.h>
22 #include <linux/mutex.h>
23 #include <linux/namei.h>
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>
30 #include <linux/audit.h>
31 #include <linux/uaccess.h>
32 #include <linux/kobject.h>
33 #include <linux/ctype.h>
35 /* selinuxfs pseudo filesystem for exporting the security policy API.
36 Based on the proc code and the fs/nfsd/nfsctl.c code. */
43 #include "conditional.h"
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 */
58 SEL_MEMBER, /* compute polyinstantiation membership decision */
59 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
60 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
61 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
62 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
63 SEL_STATUS, /* export current status using mmap() */
64 SEL_POLICY, /* allow userspace to read the in kernel policy */
65 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
66 SEL_INO_NEXT, /* The next inode number to use */
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;
77 struct dentry *policycap_dir;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
83 static int selinux_fs_info_create(struct super_block *sb)
85 struct selinux_fs_info *fsi;
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
91 fsi->last_ino = SEL_INO_NEXT - 1;
92 fsi->state = &selinux_state;
98 static void selinux_fs_info_free(struct super_block *sb)
100 struct selinux_fs_info *fsi = sb->s_fs_info;
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);
109 kfree(sb->s_fs_info);
110 sb->s_fs_info = NULL;
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
119 #define BOOL_DIR_NAME "booleans"
120 #define CLASS_DIR_NAME "class"
121 #define POLICYCAP_DIR_NAME "policy_capabilities"
124 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
125 size_t count, loff_t *ppos)
127 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
128 char tmpbuf[TMPBUFLEN];
131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
132 enforcing_enabled(fsi->state));
133 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
136 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
137 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
138 size_t count, loff_t *ppos)
141 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
142 struct selinux_state *state = fsi->state;
145 int old_value, new_value;
147 if (count >= PAGE_SIZE)
150 /* No partial writes. */
154 page = memdup_user_nul(buf, count);
156 return PTR_ERR(page);
159 if (sscanf(page, "%d", &new_value) != 1)
162 new_value = !!new_value;
164 old_value = enforcing_enabled(state);
165 if (new_value != old_value) {
166 length = avc_has_perm(&selinux_state,
167 current_sid(), SECINITSID_SECURITY,
168 SECCLASS_SECURITY, SECURITY__SETENFORCE,
172 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
173 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
174 " enabled=1 old-enabled=1 lsm=selinux res=1",
175 new_value, old_value,
176 from_kuid(&init_user_ns, audit_get_loginuid(current)),
177 audit_get_sessionid(current));
178 enforcing_set(state, new_value);
180 avc_ss_reset(state->avc, 0);
181 selnl_notify_setenforce(new_value);
182 selinux_status_update_setenforce(state, new_value);
184 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
192 #define sel_write_enforce NULL
195 static const struct file_operations sel_enforce_ops = {
196 .read = sel_read_enforce,
197 .write = sel_write_enforce,
198 .llseek = generic_file_llseek,
201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
202 size_t count, loff_t *ppos)
204 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
205 struct selinux_state *state = fsi->state;
206 char tmpbuf[TMPBUFLEN];
208 ino_t ino = file_inode(filp)->i_ino;
209 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
210 security_get_reject_unknown(state) :
211 !security_get_allow_unknown(state);
213 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
214 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
217 static const struct file_operations sel_handle_unknown_ops = {
218 .read = sel_read_handle_unknown,
219 .llseek = generic_file_llseek,
222 static int sel_open_handle_status(struct inode *inode, struct file *filp)
224 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
225 struct page *status = selinux_kernel_status_page(fsi->state);
230 filp->private_data = status;
235 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
236 size_t count, loff_t *ppos)
238 struct page *status = filp->private_data;
242 return simple_read_from_buffer(buf, count, ppos,
243 page_address(status),
244 sizeof(struct selinux_kernel_status));
247 static int sel_mmap_handle_status(struct file *filp,
248 struct vm_area_struct *vma)
250 struct page *status = filp->private_data;
251 unsigned long size = vma->vm_end - vma->vm_start;
255 /* only allows one page from the head */
256 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
258 /* disallow writable mapping */
259 if (vma->vm_flags & VM_WRITE)
261 /* disallow mprotect() turns it into writable */
262 vma->vm_flags &= ~VM_MAYWRITE;
264 return remap_pfn_range(vma, vma->vm_start,
266 size, vma->vm_page_prot);
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,
276 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
277 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
278 size_t count, loff_t *ppos)
281 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
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
292 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
294 if (count >= PAGE_SIZE)
297 /* No partial writes. */
301 page = memdup_user_nul(buf, count);
303 return PTR_ERR(page);
306 if (sscanf(page, "%d", &new_value) != 1)
310 enforcing = enforcing_enabled(fsi->state);
311 length = selinux_disable(fsi->state);
314 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
315 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
316 " enabled=0 old-enabled=1 lsm=selinux res=1",
317 enforcing, enforcing,
318 from_kuid(&init_user_ns, audit_get_loginuid(current)),
319 audit_get_sessionid(current));
328 #define sel_write_disable NULL
331 static const struct file_operations sel_disable_ops = {
332 .write = sel_write_disable,
333 .llseek = generic_file_llseek,
336 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
337 size_t count, loff_t *ppos)
339 char tmpbuf[TMPBUFLEN];
342 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
343 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
346 static const struct file_operations sel_policyvers_ops = {
347 .read = sel_read_policyvers,
348 .llseek = generic_file_llseek,
351 /* declaration for sel_write_load */
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);
359 /* declaration for sel_make_class_dirs */
360 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
363 /* declaration for sel_make_policy_nodes */
364 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
367 /* declaration for sel_make_policy_nodes */
368 static void sel_remove_entries(struct dentry *de);
370 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
371 size_t count, loff_t *ppos)
373 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
374 char tmpbuf[TMPBUFLEN];
377 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
378 security_mls_enabled(fsi->state));
379 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
382 static const struct file_operations sel_mls_ops = {
383 .read = sel_read_mls,
384 .llseek = generic_file_llseek,
387 struct policy_load_memory {
392 static int sel_open_policy(struct inode *inode, struct file *filp)
394 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
395 struct selinux_state *state = fsi->state;
396 struct policy_load_memory *plm = NULL;
399 BUG_ON(filp->private_data);
401 mutex_lock(&fsi->state->policy_mutex);
403 rc = avc_has_perm(&selinux_state,
404 current_sid(), SECINITSID_SECURITY,
405 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
410 if (fsi->policy_opened)
414 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
418 rc = security_read_policy(state, &plm->data, &plm->len);
422 if ((size_t)i_size_read(inode) != plm->len) {
424 i_size_write(inode, plm->len);
428 fsi->policy_opened = 1;
430 filp->private_data = plm;
432 mutex_unlock(&fsi->state->policy_mutex);
436 mutex_unlock(&fsi->state->policy_mutex);
444 static int sel_release_policy(struct inode *inode, struct file *filp)
446 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
447 struct policy_load_memory *plm = filp->private_data;
451 fsi->policy_opened = 0;
459 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
460 size_t count, loff_t *ppos)
462 struct policy_load_memory *plm = filp->private_data;
465 ret = avc_has_perm(&selinux_state,
466 current_sid(), SECINITSID_SECURITY,
467 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
471 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
474 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
476 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
477 unsigned long offset;
480 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
481 return VM_FAULT_SIGBUS;
483 offset = vmf->pgoff << PAGE_SHIFT;
484 if (offset >= roundup(plm->len, PAGE_SIZE))
485 return VM_FAULT_SIGBUS;
487 page = vmalloc_to_page(plm->data + offset);
495 static const struct vm_operations_struct sel_mmap_policy_ops = {
496 .fault = sel_mmap_policy_fault,
497 .page_mkwrite = sel_mmap_policy_fault,
500 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
502 if (vma->vm_flags & VM_SHARED) {
503 /* do not allow mprotect to make mapping writable */
504 vma->vm_flags &= ~VM_MAYWRITE;
506 if (vma->vm_flags & VM_WRITE)
510 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
511 vma->vm_ops = &sel_mmap_policy_ops;
516 static const struct file_operations sel_policy_ops = {
517 .open = sel_open_policy,
518 .read = sel_read_policy,
519 .mmap = sel_mmap_policy,
520 .release = sel_release_policy,
521 .llseek = generic_file_llseek,
524 static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
525 unsigned int *bool_values)
529 /* bool_dir cleanup */
530 for (i = 0; i < bool_num; i++)
531 kfree(bool_names[i]);
536 static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
537 struct selinux_policy *newpolicy)
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 */
546 tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
547 if (IS_ERR(tmp_parent))
548 return PTR_ERR(tmp_parent);
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);
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);
564 ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
565 &tmp_bool_names, &tmp_bool_values);
569 ret = sel_make_classes(newpolicy, tmp_class_dir,
570 &fsi->last_class_ino);
575 old_dentry = fsi->bool_dir;
576 lock_rename(tmp_bool_dir, old_dentry);
577 d_exchange(tmp_bool_dir, fsi->bool_dir);
579 old_bool_num = fsi->bool_num;
580 old_bool_names = fsi->bool_pending_names;
581 old_bool_values = fsi->bool_pending_values;
583 fsi->bool_num = tmp_bool_num;
584 fsi->bool_pending_names = tmp_bool_names;
585 fsi->bool_pending_values = tmp_bool_values;
587 sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
589 fsi->bool_dir = tmp_bool_dir;
590 unlock_rename(tmp_bool_dir, old_dentry);
593 old_dentry = fsi->class_dir;
594 lock_rename(tmp_class_dir, old_dentry);
595 d_exchange(tmp_class_dir, fsi->class_dir);
596 fsi->class_dir = tmp_class_dir;
597 unlock_rename(tmp_class_dir, old_dentry);
600 /* Since the other temporary dirs are children of tmp_parent
601 * this will handle all the cleanup in the case of a failure before
604 sel_remove_entries(tmp_parent);
605 dput(tmp_parent); /* d_genocide() only handles the children */
610 static ssize_t sel_write_load(struct file *file, const char __user *buf,
611 size_t count, loff_t *ppos)
614 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
615 struct selinux_load_state load_state;
619 mutex_lock(&fsi->state->policy_mutex);
621 length = avc_has_perm(&selinux_state,
622 current_sid(), SECINITSID_SECURITY,
623 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
627 /* No partial writes. */
633 data = vmalloc(count);
638 if (copy_from_user(data, buf, count) != 0)
641 length = security_load_policy(fsi->state, data, count, &load_state);
643 pr_warn_ratelimited("SELinux: failed to load policy\n");
647 length = sel_make_policy_nodes(fsi, load_state.policy);
649 pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
650 selinux_policy_cancel(fsi->state, &load_state);
654 selinux_policy_commit(fsi->state, &load_state);
658 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
659 "auid=%u ses=%u lsm=selinux res=1",
660 from_kuid(&init_user_ns, audit_get_loginuid(current)),
661 audit_get_sessionid(current));
663 mutex_unlock(&fsi->state->policy_mutex);
668 static const struct file_operations sel_load_ops = {
669 .write = sel_write_load,
670 .llseek = generic_file_llseek,
673 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
675 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
676 struct selinux_state *state = fsi->state;
681 length = avc_has_perm(&selinux_state,
682 current_sid(), SECINITSID_SECURITY,
683 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
687 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
691 length = security_sid_to_context(state, sid, &canon, &len);
696 if (len > SIMPLE_TRANSACTION_LIMIT) {
697 pr_err("SELinux: %s: context size (%u) exceeds "
698 "payload max\n", __func__, len);
702 memcpy(buf, canon, len);
709 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
710 size_t count, loff_t *ppos)
712 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
713 char tmpbuf[TMPBUFLEN];
716 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
717 checkreqprot_get(fsi->state));
718 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
721 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
722 size_t count, loff_t *ppos)
724 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
727 unsigned int new_value;
729 length = avc_has_perm(&selinux_state,
730 current_sid(), SECINITSID_SECURITY,
731 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
736 if (count >= PAGE_SIZE)
739 /* No partial writes. */
743 page = memdup_user_nul(buf, count);
745 return PTR_ERR(page);
748 if (sscanf(page, "%u", &new_value) != 1)
752 char comm[sizeof(current->comm)];
754 memcpy(comm, current->comm, sizeof(comm));
755 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
759 checkreqprot_set(fsi->state, (new_value ? 1 : 0));
765 static const struct file_operations sel_checkreqprot_ops = {
766 .read = sel_read_checkreqprot,
767 .write = sel_write_checkreqprot,
768 .llseek = generic_file_llseek,
771 static ssize_t sel_write_validatetrans(struct file *file,
772 const char __user *buf,
773 size_t count, loff_t *ppos)
775 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
776 struct selinux_state *state = fsi->state;
777 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
779 u32 osid, nsid, tsid;
783 rc = avc_has_perm(&selinux_state,
784 current_sid(), SECINITSID_SECURITY,
785 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
790 if (count >= PAGE_SIZE)
793 /* No partial writes. */
798 req = memdup_user_nul(buf, count);
806 oldcon = kzalloc(count + 1, GFP_KERNEL);
810 newcon = kzalloc(count + 1, GFP_KERNEL);
814 taskcon = kzalloc(count + 1, GFP_KERNEL);
819 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
822 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
826 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
830 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
834 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
845 static const struct file_operations sel_transition_ops = {
846 .write = sel_write_validatetrans,
847 .llseek = generic_file_llseek,
851 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
853 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
854 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
855 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
856 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
857 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
859 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
860 [SEL_ACCESS] = sel_write_access,
861 [SEL_CREATE] = sel_write_create,
862 [SEL_RELABEL] = sel_write_relabel,
863 [SEL_USER] = sel_write_user,
864 [SEL_MEMBER] = sel_write_member,
865 [SEL_CONTEXT] = sel_write_context,
868 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
870 ino_t ino = file_inode(file)->i_ino;
874 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
877 data = simple_transaction_get(file, buf, size);
879 return PTR_ERR(data);
881 rv = write_op[ino](file, data, size);
883 simple_transaction_set(file, rv);
889 static const struct file_operations transaction_ops = {
890 .write = selinux_transaction_write,
891 .read = simple_transaction_read,
892 .release = simple_transaction_release,
893 .llseek = generic_file_llseek,
897 * payload - write methods
898 * If the method has a response, the response should be put in buf,
899 * and the length returned. Otherwise return 0 or and -error.
902 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
904 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
905 struct selinux_state *state = fsi->state;
906 char *scon = NULL, *tcon = NULL;
909 struct av_decision avd;
912 length = avc_has_perm(&selinux_state,
913 current_sid(), SECINITSID_SECURITY,
914 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
919 scon = kzalloc(size + 1, GFP_KERNEL);
924 tcon = kzalloc(size + 1, GFP_KERNEL);
929 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
932 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
936 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
940 security_compute_av_user(state, ssid, tsid, tclass, &avd);
942 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
944 avd.allowed, 0xffffffff,
945 avd.auditallow, avd.auditdeny,
946 avd.seqno, avd.flags);
953 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
955 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
956 struct selinux_state *state = fsi->state;
957 char *scon = NULL, *tcon = NULL;
958 char *namebuf = NULL, *objname = NULL;
959 u32 ssid, tsid, newsid;
966 length = avc_has_perm(&selinux_state,
967 current_sid(), SECINITSID_SECURITY,
968 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
974 scon = kzalloc(size + 1, GFP_KERNEL);
979 tcon = kzalloc(size + 1, GFP_KERNEL);
984 namebuf = kzalloc(size + 1, GFP_KERNEL);
989 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
990 if (nargs < 3 || nargs > 4)
994 * If and when the name of new object to be queried contains
995 * either whitespace or multibyte characters, they shall be
996 * encoded based on the percentage-encoding rule.
997 * If not encoded, the sscanf logic picks up only left-half
998 * of the supplied name; splitted by a whitespace unexpectedly.
1008 else if (c1 == '%') {
1009 c1 = hex_to_bin(*r++);
1012 c2 = hex_to_bin(*r++);
1015 c1 = (c1 << 4) | c2;
1018 } while (c1 != '\0');
1023 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1027 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1031 length = security_transition_sid_user(state, ssid, tsid, tclass,
1036 length = security_sid_to_context(state, newsid, &newcon, &len);
1041 if (len > SIMPLE_TRANSACTION_LIMIT) {
1042 pr_err("SELinux: %s: context size (%u) exceeds "
1043 "payload max\n", __func__, len);
1047 memcpy(buf, newcon, len);
1057 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1059 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1060 struct selinux_state *state = fsi->state;
1061 char *scon = NULL, *tcon = NULL;
1062 u32 ssid, tsid, newsid;
1065 char *newcon = NULL;
1068 length = avc_has_perm(&selinux_state,
1069 current_sid(), SECINITSID_SECURITY,
1070 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1076 scon = kzalloc(size + 1, GFP_KERNEL);
1081 tcon = kzalloc(size + 1, GFP_KERNEL);
1086 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1089 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1093 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1097 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1101 length = security_sid_to_context(state, newsid, &newcon, &len);
1106 if (len > SIMPLE_TRANSACTION_LIMIT)
1109 memcpy(buf, newcon, len);
1118 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1120 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1121 struct selinux_state *state = fsi->state;
1122 char *con = NULL, *user = NULL, *ptr;
1123 u32 sid, *sids = NULL;
1129 length = avc_has_perm(&selinux_state,
1130 current_sid(), SECINITSID_SECURITY,
1131 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1137 con = kzalloc(size + 1, GFP_KERNEL);
1142 user = kzalloc(size + 1, GFP_KERNEL);
1147 if (sscanf(buf, "%s %s", con, user) != 2)
1150 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1154 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1158 length = sprintf(buf, "%u", nsids) + 1;
1160 for (i = 0; i < nsids; i++) {
1161 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1166 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1171 memcpy(ptr, newcon, len);
1183 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1185 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1186 struct selinux_state *state = fsi->state;
1187 char *scon = NULL, *tcon = NULL;
1188 u32 ssid, tsid, newsid;
1191 char *newcon = NULL;
1194 length = avc_has_perm(&selinux_state,
1195 current_sid(), SECINITSID_SECURITY,
1196 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1202 scon = kzalloc(size + 1, GFP_KERNEL);
1207 tcon = kzalloc(size + 1, GFP_KERNEL);
1212 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1215 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1219 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1223 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1227 length = security_sid_to_context(state, newsid, &newcon, &len);
1232 if (len > SIMPLE_TRANSACTION_LIMIT) {
1233 pr_err("SELinux: %s: context size (%u) exceeds "
1234 "payload max\n", __func__, len);
1238 memcpy(buf, newcon, len);
1247 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1249 struct inode *ret = new_inode(sb);
1253 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1258 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1259 size_t count, loff_t *ppos)
1261 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1266 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1267 const char *name = filep->f_path.dentry->d_name.name;
1269 mutex_lock(&fsi->state->policy_mutex);
1272 if (index >= fsi->bool_num || strcmp(name,
1273 fsi->bool_pending_names[index]))
1277 page = (char *)get_zeroed_page(GFP_KERNEL);
1281 cur_enforcing = security_get_bool_value(fsi->state, index);
1282 if (cur_enforcing < 0) {
1283 ret = cur_enforcing;
1286 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1287 fsi->bool_pending_values[index]);
1288 mutex_unlock(&fsi->state->policy_mutex);
1289 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1291 free_page((unsigned long)page);
1295 mutex_unlock(&fsi->state->policy_mutex);
1299 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1300 size_t count, loff_t *ppos)
1302 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1306 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1307 const char *name = filep->f_path.dentry->d_name.name;
1309 if (count >= PAGE_SIZE)
1312 /* No partial writes. */
1316 page = memdup_user_nul(buf, count);
1318 return PTR_ERR(page);
1320 mutex_lock(&fsi->state->policy_mutex);
1322 length = avc_has_perm(&selinux_state,
1323 current_sid(), SECINITSID_SECURITY,
1324 SECCLASS_SECURITY, SECURITY__SETBOOL,
1330 if (index >= fsi->bool_num || strcmp(name,
1331 fsi->bool_pending_names[index]))
1335 if (sscanf(page, "%d", &new_value) != 1)
1341 fsi->bool_pending_values[index] = new_value;
1345 mutex_unlock(&fsi->state->policy_mutex);
1350 static const struct file_operations sel_bool_ops = {
1351 .read = sel_read_bool,
1352 .write = sel_write_bool,
1353 .llseek = generic_file_llseek,
1356 static ssize_t sel_commit_bools_write(struct file *filep,
1357 const char __user *buf,
1358 size_t count, loff_t *ppos)
1360 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1365 if (count >= PAGE_SIZE)
1368 /* No partial writes. */
1372 page = memdup_user_nul(buf, count);
1374 return PTR_ERR(page);
1376 mutex_lock(&fsi->state->policy_mutex);
1378 length = avc_has_perm(&selinux_state,
1379 current_sid(), SECINITSID_SECURITY,
1380 SECCLASS_SECURITY, SECURITY__SETBOOL,
1386 if (sscanf(page, "%d", &new_value) != 1)
1390 if (new_value && fsi->bool_pending_values)
1391 length = security_set_bools(fsi->state, fsi->bool_num,
1392 fsi->bool_pending_values);
1398 mutex_unlock(&fsi->state->policy_mutex);
1403 static const struct file_operations sel_commit_bools_ops = {
1404 .write = sel_commit_bools_write,
1405 .llseek = generic_file_llseek,
1408 static void sel_remove_entries(struct dentry *de)
1411 shrink_dcache_parent(de);
1414 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1415 unsigned int *bool_num, char ***bool_pending_names,
1416 unsigned int **bool_pending_values)
1420 struct dentry *dentry = NULL;
1421 struct inode *inode = NULL;
1422 struct inode_security_struct *isec;
1423 char **names = NULL, *page;
1429 page = (char *)get_zeroed_page(GFP_KERNEL);
1433 ret = security_get_bools(newpolicy, &num, &names, &values);
1437 for (i = 0; i < num; i++) {
1439 dentry = d_alloc_name(bool_dir, names[i]);
1444 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1450 ret = -ENAMETOOLONG;
1451 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1452 if (len >= PAGE_SIZE) {
1458 isec = selinux_inode(inode);
1459 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1460 SECCLASS_FILE, &sid);
1462 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1464 sid = SECINITSID_SECURITY;
1468 isec->initialized = LABEL_INITIALIZED;
1469 inode->i_fop = &sel_bool_ops;
1470 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1471 d_add(dentry, inode);
1474 *bool_pending_names = names;
1475 *bool_pending_values = values;
1477 free_page((unsigned long)page);
1480 free_page((unsigned long)page);
1483 for (i = 0; i < num; i++)
1488 sel_remove_entries(bool_dir);
1493 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1494 size_t count, loff_t *ppos)
1496 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1497 struct selinux_state *state = fsi->state;
1498 char tmpbuf[TMPBUFLEN];
1501 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1502 avc_get_cache_threshold(state->avc));
1503 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1506 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1507 const char __user *buf,
1508 size_t count, loff_t *ppos)
1511 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1512 struct selinux_state *state = fsi->state;
1515 unsigned int new_value;
1517 ret = avc_has_perm(&selinux_state,
1518 current_sid(), SECINITSID_SECURITY,
1519 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1524 if (count >= PAGE_SIZE)
1527 /* No partial writes. */
1531 page = memdup_user_nul(buf, count);
1533 return PTR_ERR(page);
1536 if (sscanf(page, "%u", &new_value) != 1)
1539 avc_set_cache_threshold(state->avc, new_value);
1547 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1548 size_t count, loff_t *ppos)
1550 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1551 struct selinux_state *state = fsi->state;
1555 page = (char *)__get_free_page(GFP_KERNEL);
1559 length = avc_get_hash_stats(state->avc, page);
1561 length = simple_read_from_buffer(buf, count, ppos, page, length);
1562 free_page((unsigned long)page);
1567 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1568 size_t count, loff_t *ppos)
1570 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1571 struct selinux_state *state = fsi->state;
1575 page = (char *)__get_free_page(GFP_KERNEL);
1579 length = security_sidtab_hash_stats(state, page);
1581 length = simple_read_from_buffer(buf, count, ppos, page,
1583 free_page((unsigned long)page);
1588 static const struct file_operations sel_sidtab_hash_stats_ops = {
1589 .read = sel_read_sidtab_hash_stats,
1590 .llseek = generic_file_llseek,
1593 static const struct file_operations sel_avc_cache_threshold_ops = {
1594 .read = sel_read_avc_cache_threshold,
1595 .write = sel_write_avc_cache_threshold,
1596 .llseek = generic_file_llseek,
1599 static const struct file_operations sel_avc_hash_stats_ops = {
1600 .read = sel_read_avc_hash_stats,
1601 .llseek = generic_file_llseek,
1604 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1605 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1609 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1610 if (!cpu_possible(cpu))
1613 return &per_cpu(avc_cache_stats, cpu);
1619 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1621 loff_t n = *pos - 1;
1624 return SEQ_START_TOKEN;
1626 return sel_avc_get_stat_idx(&n);
1629 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1631 return sel_avc_get_stat_idx(pos);
1634 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1636 struct avc_cache_stats *st = v;
1638 if (v == SEQ_START_TOKEN) {
1640 "lookups hits misses allocations reclaims frees\n");
1642 unsigned int lookups = st->lookups;
1643 unsigned int misses = st->misses;
1644 unsigned int hits = lookups - misses;
1645 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1646 hits, misses, st->allocations,
1647 st->reclaims, st->frees);
1652 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1655 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1656 .start = sel_avc_stats_seq_start,
1657 .next = sel_avc_stats_seq_next,
1658 .show = sel_avc_stats_seq_show,
1659 .stop = sel_avc_stats_seq_stop,
1662 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1664 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1667 static const struct file_operations sel_avc_cache_stats_ops = {
1668 .open = sel_open_avc_cache_stats,
1670 .llseek = seq_lseek,
1671 .release = seq_release,
1675 static int sel_make_avc_files(struct dentry *dir)
1677 struct super_block *sb = dir->d_sb;
1678 struct selinux_fs_info *fsi = sb->s_fs_info;
1680 static const struct tree_descr files[] = {
1681 { "cache_threshold",
1682 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1683 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1684 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1685 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1689 for (i = 0; i < ARRAY_SIZE(files); i++) {
1690 struct inode *inode;
1691 struct dentry *dentry;
1693 dentry = d_alloc_name(dir, files[i].name);
1697 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1703 inode->i_fop = files[i].ops;
1704 inode->i_ino = ++fsi->last_ino;
1705 d_add(dentry, inode);
1711 static int sel_make_ss_files(struct dentry *dir)
1713 struct super_block *sb = dir->d_sb;
1714 struct selinux_fs_info *fsi = sb->s_fs_info;
1716 static struct tree_descr files[] = {
1717 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1720 for (i = 0; i < ARRAY_SIZE(files); i++) {
1721 struct inode *inode;
1722 struct dentry *dentry;
1724 dentry = d_alloc_name(dir, files[i].name);
1728 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1734 inode->i_fop = files[i].ops;
1735 inode->i_ino = ++fsi->last_ino;
1736 d_add(dentry, inode);
1742 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1743 size_t count, loff_t *ppos)
1745 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1750 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1751 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1755 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1760 static const struct file_operations sel_initcon_ops = {
1761 .read = sel_read_initcon,
1762 .llseek = generic_file_llseek,
1765 static int sel_make_initcon_files(struct dentry *dir)
1769 for (i = 1; i <= SECINITSID_NUM; i++) {
1770 struct inode *inode;
1771 struct dentry *dentry;
1772 const char *s = security_get_initial_sid_context(i);
1776 dentry = d_alloc_name(dir, s);
1780 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1786 inode->i_fop = &sel_initcon_ops;
1787 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1788 d_add(dentry, inode);
1794 static inline unsigned long sel_class_to_ino(u16 class)
1796 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1799 static inline u16 sel_ino_to_class(unsigned long ino)
1801 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1804 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1806 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1809 static inline u32 sel_ino_to_perm(unsigned long ino)
1811 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1814 static ssize_t sel_read_class(struct file *file, char __user *buf,
1815 size_t count, loff_t *ppos)
1817 unsigned long ino = file_inode(file)->i_ino;
1818 char res[TMPBUFLEN];
1819 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1820 return simple_read_from_buffer(buf, count, ppos, res, len);
1823 static const struct file_operations sel_class_ops = {
1824 .read = sel_read_class,
1825 .llseek = generic_file_llseek,
1828 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1829 size_t count, loff_t *ppos)
1831 unsigned long ino = file_inode(file)->i_ino;
1832 char res[TMPBUFLEN];
1833 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1834 return simple_read_from_buffer(buf, count, ppos, res, len);
1837 static const struct file_operations sel_perm_ops = {
1838 .read = sel_read_perm,
1839 .llseek = generic_file_llseek,
1842 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1843 size_t count, loff_t *ppos)
1845 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1847 char tmpbuf[TMPBUFLEN];
1849 unsigned long i_ino = file_inode(file)->i_ino;
1851 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1852 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1854 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1857 static const struct file_operations sel_policycap_ops = {
1858 .read = sel_read_policycap,
1859 .llseek = generic_file_llseek,
1862 static int sel_make_perm_files(struct selinux_policy *newpolicy,
1863 char *objclass, int classvalue,
1869 rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1873 for (i = 0; i < nperms; i++) {
1874 struct inode *inode;
1875 struct dentry *dentry;
1878 dentry = d_alloc_name(dir, perms[i]);
1883 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1889 inode->i_fop = &sel_perm_ops;
1890 /* i+1 since perm values are 1-indexed */
1891 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1892 d_add(dentry, inode);
1896 for (i = 0; i < nperms; i++)
1902 static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1903 char *classname, int index,
1906 struct super_block *sb = dir->d_sb;
1907 struct selinux_fs_info *fsi = sb->s_fs_info;
1908 struct dentry *dentry = NULL;
1909 struct inode *inode = NULL;
1912 dentry = d_alloc_name(dir, "index");
1916 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1922 inode->i_fop = &sel_class_ops;
1923 inode->i_ino = sel_class_to_ino(index);
1924 d_add(dentry, inode);
1926 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1928 return PTR_ERR(dentry);
1930 rc = sel_make_perm_files(newpolicy, classname, index, dentry);
1935 static int sel_make_classes(struct selinux_policy *newpolicy,
1936 struct dentry *class_dir,
1937 unsigned long *last_class_ino)
1940 int rc, nclasses, i;
1943 rc = security_get_classes(newpolicy, &classes, &nclasses);
1947 /* +2 since classes are 1-indexed */
1948 *last_class_ino = sel_class_to_ino(nclasses + 2);
1950 for (i = 0; i < nclasses; i++) {
1951 struct dentry *class_name_dir;
1953 class_name_dir = sel_make_dir(class_dir, classes[i],
1955 if (IS_ERR(class_name_dir)) {
1956 rc = PTR_ERR(class_name_dir);
1960 /* i+1 since class values are 1-indexed */
1961 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1968 for (i = 0; i < nclasses; i++)
1974 static int sel_make_policycap(struct selinux_fs_info *fsi)
1977 struct dentry *dentry = NULL;
1978 struct inode *inode = NULL;
1980 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1981 if (iter < ARRAY_SIZE(selinux_policycap_names))
1982 dentry = d_alloc_name(fsi->policycap_dir,
1983 selinux_policycap_names[iter]);
1985 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1990 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1991 if (inode == NULL) {
1996 inode->i_fop = &sel_policycap_ops;
1997 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1998 d_add(dentry, inode);
2004 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2007 struct dentry *dentry = d_alloc_name(dir, name);
2008 struct inode *inode;
2011 return ERR_PTR(-ENOMEM);
2013 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2016 return ERR_PTR(-ENOMEM);
2019 inode->i_op = &simple_dir_inode_operations;
2020 inode->i_fop = &simple_dir_operations;
2021 inode->i_ino = ++(*ino);
2022 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2024 d_add(dentry, inode);
2025 /* bump link count on parent directory, too */
2026 inc_nlink(d_inode(dir));
2031 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2034 struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2037 return ERR_PTR(-ENOMEM);
2039 inode->i_op = &simple_dir_inode_operations;
2040 inode->i_fop = &simple_dir_operations;
2041 inode->i_ino = ++(*ino);
2042 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2044 return d_obtain_alias(inode);
2047 #define NULL_FILE_NAME "null"
2049 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2051 struct selinux_fs_info *fsi;
2053 struct dentry *dentry;
2054 struct inode *inode;
2055 struct inode_security_struct *isec;
2057 static const struct tree_descr selinux_files[] = {
2058 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2059 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2060 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2061 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2062 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2063 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2064 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2065 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2066 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2067 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2068 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2069 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2070 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2071 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2072 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2073 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2074 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2075 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2080 ret = selinux_fs_info_create(sb);
2084 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2088 fsi = sb->s_fs_info;
2089 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2090 if (IS_ERR(fsi->bool_dir)) {
2091 ret = PTR_ERR(fsi->bool_dir);
2092 fsi->bool_dir = NULL;
2097 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2102 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2108 inode->i_ino = ++fsi->last_ino;
2109 isec = selinux_inode(inode);
2110 isec->sid = SECINITSID_DEVNULL;
2111 isec->sclass = SECCLASS_CHR_FILE;
2112 isec->initialized = LABEL_INITIALIZED;
2114 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2115 d_add(dentry, inode);
2117 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2118 if (IS_ERR(dentry)) {
2119 ret = PTR_ERR(dentry);
2123 ret = sel_make_avc_files(dentry);
2125 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2126 if (IS_ERR(dentry)) {
2127 ret = PTR_ERR(dentry);
2131 ret = sel_make_ss_files(dentry);
2135 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2136 if (IS_ERR(dentry)) {
2137 ret = PTR_ERR(dentry);
2141 ret = sel_make_initcon_files(dentry);
2145 fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2146 if (IS_ERR(fsi->class_dir)) {
2147 ret = PTR_ERR(fsi->class_dir);
2148 fsi->class_dir = NULL;
2152 fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2154 if (IS_ERR(fsi->policycap_dir)) {
2155 ret = PTR_ERR(fsi->policycap_dir);
2156 fsi->policycap_dir = NULL;
2160 ret = sel_make_policycap(fsi);
2162 pr_err("SELinux: failed to load policy capabilities\n");
2168 pr_err("SELinux: %s: failed while creating inodes\n",
2171 selinux_fs_info_free(sb);
2176 static int sel_get_tree(struct fs_context *fc)
2178 return get_tree_single(fc, sel_fill_super);
2181 static const struct fs_context_operations sel_context_ops = {
2182 .get_tree = sel_get_tree,
2185 static int sel_init_fs_context(struct fs_context *fc)
2187 fc->ops = &sel_context_ops;
2191 static void sel_kill_sb(struct super_block *sb)
2193 selinux_fs_info_free(sb);
2194 kill_litter_super(sb);
2197 static struct file_system_type sel_fs_type = {
2198 .name = "selinuxfs",
2199 .init_fs_context = sel_init_fs_context,
2200 .kill_sb = sel_kill_sb,
2203 static struct vfsmount *selinuxfs_mount __ro_after_init;
2204 struct path selinux_null __ro_after_init;
2206 static int __init init_sel_fs(void)
2208 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2209 sizeof(NULL_FILE_NAME)-1);
2212 if (!selinux_enabled_boot)
2215 err = sysfs_create_mount_point(fs_kobj, "selinux");
2219 err = register_filesystem(&sel_fs_type);
2221 sysfs_remove_mount_point(fs_kobj, "selinux");
2225 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2226 if (IS_ERR(selinuxfs_mount)) {
2227 pr_err("selinuxfs: could not mount!\n");
2228 err = PTR_ERR(selinuxfs_mount);
2229 selinuxfs_mount = NULL;
2231 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2233 if (IS_ERR(selinux_null.dentry)) {
2234 pr_err("selinuxfs: could not lookup null!\n");
2235 err = PTR_ERR(selinux_null.dentry);
2236 selinux_null.dentry = NULL;
2242 __initcall(init_sel_fs);
2244 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2245 void exit_sel_fs(void)
2247 sysfs_remove_mount_point(fs_kobj, "selinux");
2248 dput(selinux_null.dentry);
2249 kern_unmount(selinuxfs_mount);
2250 unregister_filesystem(&sel_fs_type);