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);
567 pr_err("SELinux: failed to load policy booleans\n");
571 ret = sel_make_classes(newpolicy, tmp_class_dir,
572 &fsi->last_class_ino);
574 pr_err("SELinux: failed to load policy classes\n");
579 old_dentry = fsi->bool_dir;
580 lock_rename(tmp_bool_dir, old_dentry);
581 d_exchange(tmp_bool_dir, fsi->bool_dir);
583 old_bool_num = fsi->bool_num;
584 old_bool_names = fsi->bool_pending_names;
585 old_bool_values = fsi->bool_pending_values;
587 fsi->bool_num = tmp_bool_num;
588 fsi->bool_pending_names = tmp_bool_names;
589 fsi->bool_pending_values = tmp_bool_values;
591 sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
593 fsi->bool_dir = tmp_bool_dir;
594 unlock_rename(tmp_bool_dir, old_dentry);
597 old_dentry = fsi->class_dir;
598 lock_rename(tmp_class_dir, old_dentry);
599 d_exchange(tmp_class_dir, fsi->class_dir);
600 fsi->class_dir = tmp_class_dir;
601 unlock_rename(tmp_class_dir, old_dentry);
604 /* Since the other temporary dirs are children of tmp_parent
605 * this will handle all the cleanup in the case of a failure before
608 sel_remove_entries(tmp_parent);
609 dput(tmp_parent); /* d_genocide() only handles the children */
614 static ssize_t sel_write_load(struct file *file, const char __user *buf,
615 size_t count, loff_t *ppos)
618 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
619 struct selinux_load_state load_state;
623 mutex_lock(&fsi->state->policy_mutex);
625 length = avc_has_perm(&selinux_state,
626 current_sid(), SECINITSID_SECURITY,
627 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
631 /* No partial writes. */
637 data = vmalloc(count);
642 if (copy_from_user(data, buf, count) != 0)
645 length = security_load_policy(fsi->state, data, count, &load_state);
647 pr_warn_ratelimited("SELinux: failed to load policy\n");
651 length = sel_make_policy_nodes(fsi, load_state.policy);
653 selinux_policy_cancel(fsi->state, &load_state);
657 selinux_policy_commit(fsi->state, &load_state);
661 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
662 "auid=%u ses=%u lsm=selinux res=1",
663 from_kuid(&init_user_ns, audit_get_loginuid(current)),
664 audit_get_sessionid(current));
666 mutex_unlock(&fsi->state->policy_mutex);
671 static const struct file_operations sel_load_ops = {
672 .write = sel_write_load,
673 .llseek = generic_file_llseek,
676 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
678 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
679 struct selinux_state *state = fsi->state;
684 length = avc_has_perm(&selinux_state,
685 current_sid(), SECINITSID_SECURITY,
686 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
690 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
694 length = security_sid_to_context(state, sid, &canon, &len);
699 if (len > SIMPLE_TRANSACTION_LIMIT) {
700 pr_err("SELinux: %s: context size (%u) exceeds "
701 "payload max\n", __func__, len);
705 memcpy(buf, canon, len);
712 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
713 size_t count, loff_t *ppos)
715 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
716 char tmpbuf[TMPBUFLEN];
719 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
720 checkreqprot_get(fsi->state));
721 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
724 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
725 size_t count, loff_t *ppos)
727 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
730 unsigned int new_value;
732 length = avc_has_perm(&selinux_state,
733 current_sid(), SECINITSID_SECURITY,
734 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
739 if (count >= PAGE_SIZE)
742 /* No partial writes. */
746 page = memdup_user_nul(buf, count);
748 return PTR_ERR(page);
751 if (sscanf(page, "%u", &new_value) != 1)
755 char comm[sizeof(current->comm)];
757 memcpy(comm, current->comm, sizeof(comm));
758 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
762 checkreqprot_set(fsi->state, (new_value ? 1 : 0));
768 static const struct file_operations sel_checkreqprot_ops = {
769 .read = sel_read_checkreqprot,
770 .write = sel_write_checkreqprot,
771 .llseek = generic_file_llseek,
774 static ssize_t sel_write_validatetrans(struct file *file,
775 const char __user *buf,
776 size_t count, loff_t *ppos)
778 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
779 struct selinux_state *state = fsi->state;
780 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
782 u32 osid, nsid, tsid;
786 rc = avc_has_perm(&selinux_state,
787 current_sid(), SECINITSID_SECURITY,
788 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
793 if (count >= PAGE_SIZE)
796 /* No partial writes. */
801 req = memdup_user_nul(buf, count);
809 oldcon = kzalloc(count + 1, GFP_KERNEL);
813 newcon = kzalloc(count + 1, GFP_KERNEL);
817 taskcon = kzalloc(count + 1, GFP_KERNEL);
822 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
825 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
829 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
833 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
837 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
848 static const struct file_operations sel_transition_ops = {
849 .write = sel_write_validatetrans,
850 .llseek = generic_file_llseek,
854 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
856 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
857 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
858 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
859 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
860 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
862 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
863 [SEL_ACCESS] = sel_write_access,
864 [SEL_CREATE] = sel_write_create,
865 [SEL_RELABEL] = sel_write_relabel,
866 [SEL_USER] = sel_write_user,
867 [SEL_MEMBER] = sel_write_member,
868 [SEL_CONTEXT] = sel_write_context,
871 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
873 ino_t ino = file_inode(file)->i_ino;
877 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
880 data = simple_transaction_get(file, buf, size);
882 return PTR_ERR(data);
884 rv = write_op[ino](file, data, size);
886 simple_transaction_set(file, rv);
892 static const struct file_operations transaction_ops = {
893 .write = selinux_transaction_write,
894 .read = simple_transaction_read,
895 .release = simple_transaction_release,
896 .llseek = generic_file_llseek,
900 * payload - write methods
901 * If the method has a response, the response should be put in buf,
902 * and the length returned. Otherwise return 0 or and -error.
905 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
907 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
908 struct selinux_state *state = fsi->state;
909 char *scon = NULL, *tcon = NULL;
912 struct av_decision avd;
915 length = avc_has_perm(&selinux_state,
916 current_sid(), SECINITSID_SECURITY,
917 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
922 scon = kzalloc(size + 1, GFP_KERNEL);
927 tcon = kzalloc(size + 1, GFP_KERNEL);
932 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
935 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
939 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
943 security_compute_av_user(state, ssid, tsid, tclass, &avd);
945 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
947 avd.allowed, 0xffffffff,
948 avd.auditallow, avd.auditdeny,
949 avd.seqno, avd.flags);
956 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
958 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
959 struct selinux_state *state = fsi->state;
960 char *scon = NULL, *tcon = NULL;
961 char *namebuf = NULL, *objname = NULL;
962 u32 ssid, tsid, newsid;
969 length = avc_has_perm(&selinux_state,
970 current_sid(), SECINITSID_SECURITY,
971 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
977 scon = kzalloc(size + 1, GFP_KERNEL);
982 tcon = kzalloc(size + 1, GFP_KERNEL);
987 namebuf = kzalloc(size + 1, GFP_KERNEL);
992 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
993 if (nargs < 3 || nargs > 4)
997 * If and when the name of new object to be queried contains
998 * either whitespace or multibyte characters, they shall be
999 * encoded based on the percentage-encoding rule.
1000 * If not encoded, the sscanf logic picks up only left-half
1001 * of the supplied name; splitted by a whitespace unexpectedly.
1011 else if (c1 == '%') {
1012 c1 = hex_to_bin(*r++);
1015 c2 = hex_to_bin(*r++);
1018 c1 = (c1 << 4) | c2;
1021 } while (c1 != '\0');
1026 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1030 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1034 length = security_transition_sid_user(state, ssid, tsid, tclass,
1039 length = security_sid_to_context(state, newsid, &newcon, &len);
1044 if (len > SIMPLE_TRANSACTION_LIMIT) {
1045 pr_err("SELinux: %s: context size (%u) exceeds "
1046 "payload max\n", __func__, len);
1050 memcpy(buf, newcon, len);
1060 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1062 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1063 struct selinux_state *state = fsi->state;
1064 char *scon = NULL, *tcon = NULL;
1065 u32 ssid, tsid, newsid;
1068 char *newcon = NULL;
1071 length = avc_has_perm(&selinux_state,
1072 current_sid(), SECINITSID_SECURITY,
1073 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1079 scon = kzalloc(size + 1, GFP_KERNEL);
1084 tcon = kzalloc(size + 1, GFP_KERNEL);
1089 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1092 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1096 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1100 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1104 length = security_sid_to_context(state, newsid, &newcon, &len);
1109 if (len > SIMPLE_TRANSACTION_LIMIT)
1112 memcpy(buf, newcon, len);
1121 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1123 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1124 struct selinux_state *state = fsi->state;
1125 char *con = NULL, *user = NULL, *ptr;
1126 u32 sid, *sids = NULL;
1132 length = avc_has_perm(&selinux_state,
1133 current_sid(), SECINITSID_SECURITY,
1134 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1140 con = kzalloc(size + 1, GFP_KERNEL);
1145 user = kzalloc(size + 1, GFP_KERNEL);
1150 if (sscanf(buf, "%s %s", con, user) != 2)
1153 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1157 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1161 length = sprintf(buf, "%u", nsids) + 1;
1163 for (i = 0; i < nsids; i++) {
1164 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1169 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1174 memcpy(ptr, newcon, len);
1186 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1188 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1189 struct selinux_state *state = fsi->state;
1190 char *scon = NULL, *tcon = NULL;
1191 u32 ssid, tsid, newsid;
1194 char *newcon = NULL;
1197 length = avc_has_perm(&selinux_state,
1198 current_sid(), SECINITSID_SECURITY,
1199 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1205 scon = kzalloc(size + 1, GFP_KERNEL);
1210 tcon = kzalloc(size + 1, GFP_KERNEL);
1215 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1218 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1222 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1226 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1230 length = security_sid_to_context(state, newsid, &newcon, &len);
1235 if (len > SIMPLE_TRANSACTION_LIMIT) {
1236 pr_err("SELinux: %s: context size (%u) exceeds "
1237 "payload max\n", __func__, len);
1241 memcpy(buf, newcon, len);
1250 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1252 struct inode *ret = new_inode(sb);
1256 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1261 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1262 size_t count, loff_t *ppos)
1264 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1269 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1270 const char *name = filep->f_path.dentry->d_name.name;
1272 mutex_lock(&fsi->state->policy_mutex);
1275 if (index >= fsi->bool_num || strcmp(name,
1276 fsi->bool_pending_names[index]))
1280 page = (char *)get_zeroed_page(GFP_KERNEL);
1284 cur_enforcing = security_get_bool_value(fsi->state, index);
1285 if (cur_enforcing < 0) {
1286 ret = cur_enforcing;
1289 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1290 fsi->bool_pending_values[index]);
1291 mutex_unlock(&fsi->state->policy_mutex);
1292 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1294 free_page((unsigned long)page);
1298 mutex_unlock(&fsi->state->policy_mutex);
1302 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1303 size_t count, loff_t *ppos)
1305 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1309 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1310 const char *name = filep->f_path.dentry->d_name.name;
1312 if (count >= PAGE_SIZE)
1315 /* No partial writes. */
1319 page = memdup_user_nul(buf, count);
1321 return PTR_ERR(page);
1323 mutex_lock(&fsi->state->policy_mutex);
1325 length = avc_has_perm(&selinux_state,
1326 current_sid(), SECINITSID_SECURITY,
1327 SECCLASS_SECURITY, SECURITY__SETBOOL,
1333 if (index >= fsi->bool_num || strcmp(name,
1334 fsi->bool_pending_names[index]))
1338 if (sscanf(page, "%d", &new_value) != 1)
1344 fsi->bool_pending_values[index] = new_value;
1348 mutex_unlock(&fsi->state->policy_mutex);
1353 static const struct file_operations sel_bool_ops = {
1354 .read = sel_read_bool,
1355 .write = sel_write_bool,
1356 .llseek = generic_file_llseek,
1359 static ssize_t sel_commit_bools_write(struct file *filep,
1360 const char __user *buf,
1361 size_t count, loff_t *ppos)
1363 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1368 if (count >= PAGE_SIZE)
1371 /* No partial writes. */
1375 page = memdup_user_nul(buf, count);
1377 return PTR_ERR(page);
1379 mutex_lock(&fsi->state->policy_mutex);
1381 length = avc_has_perm(&selinux_state,
1382 current_sid(), SECINITSID_SECURITY,
1383 SECCLASS_SECURITY, SECURITY__SETBOOL,
1389 if (sscanf(page, "%d", &new_value) != 1)
1393 if (new_value && fsi->bool_pending_values)
1394 length = security_set_bools(fsi->state, fsi->bool_num,
1395 fsi->bool_pending_values);
1401 mutex_unlock(&fsi->state->policy_mutex);
1406 static const struct file_operations sel_commit_bools_ops = {
1407 .write = sel_commit_bools_write,
1408 .llseek = generic_file_llseek,
1411 static void sel_remove_entries(struct dentry *de)
1414 shrink_dcache_parent(de);
1417 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1418 unsigned int *bool_num, char ***bool_pending_names,
1419 unsigned int **bool_pending_values)
1423 struct dentry *dentry = NULL;
1424 struct inode *inode = NULL;
1425 struct inode_security_struct *isec;
1426 char **names = NULL, *page;
1432 page = (char *)get_zeroed_page(GFP_KERNEL);
1436 ret = security_get_bools(newpolicy, &num, &names, &values);
1440 for (i = 0; i < num; i++) {
1442 dentry = d_alloc_name(bool_dir, names[i]);
1447 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1453 ret = -ENAMETOOLONG;
1454 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1455 if (len >= PAGE_SIZE) {
1461 isec = selinux_inode(inode);
1462 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1463 SECCLASS_FILE, &sid);
1465 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1467 sid = SECINITSID_SECURITY;
1471 isec->initialized = LABEL_INITIALIZED;
1472 inode->i_fop = &sel_bool_ops;
1473 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1474 d_add(dentry, inode);
1477 *bool_pending_names = names;
1478 *bool_pending_values = values;
1480 free_page((unsigned long)page);
1483 free_page((unsigned long)page);
1486 for (i = 0; i < num; i++)
1491 sel_remove_entries(bool_dir);
1496 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1497 size_t count, loff_t *ppos)
1499 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1500 struct selinux_state *state = fsi->state;
1501 char tmpbuf[TMPBUFLEN];
1504 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1505 avc_get_cache_threshold(state->avc));
1506 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1509 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1510 const char __user *buf,
1511 size_t count, loff_t *ppos)
1514 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1515 struct selinux_state *state = fsi->state;
1518 unsigned int new_value;
1520 ret = avc_has_perm(&selinux_state,
1521 current_sid(), SECINITSID_SECURITY,
1522 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1527 if (count >= PAGE_SIZE)
1530 /* No partial writes. */
1534 page = memdup_user_nul(buf, count);
1536 return PTR_ERR(page);
1539 if (sscanf(page, "%u", &new_value) != 1)
1542 avc_set_cache_threshold(state->avc, new_value);
1550 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1551 size_t count, loff_t *ppos)
1553 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1554 struct selinux_state *state = fsi->state;
1558 page = (char *)__get_free_page(GFP_KERNEL);
1562 length = avc_get_hash_stats(state->avc, page);
1564 length = simple_read_from_buffer(buf, count, ppos, page, length);
1565 free_page((unsigned long)page);
1570 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1571 size_t count, loff_t *ppos)
1573 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1574 struct selinux_state *state = fsi->state;
1578 page = (char *)__get_free_page(GFP_KERNEL);
1582 length = security_sidtab_hash_stats(state, page);
1584 length = simple_read_from_buffer(buf, count, ppos, page,
1586 free_page((unsigned long)page);
1591 static const struct file_operations sel_sidtab_hash_stats_ops = {
1592 .read = sel_read_sidtab_hash_stats,
1593 .llseek = generic_file_llseek,
1596 static const struct file_operations sel_avc_cache_threshold_ops = {
1597 .read = sel_read_avc_cache_threshold,
1598 .write = sel_write_avc_cache_threshold,
1599 .llseek = generic_file_llseek,
1602 static const struct file_operations sel_avc_hash_stats_ops = {
1603 .read = sel_read_avc_hash_stats,
1604 .llseek = generic_file_llseek,
1607 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1608 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1612 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1613 if (!cpu_possible(cpu))
1616 return &per_cpu(avc_cache_stats, cpu);
1622 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1624 loff_t n = *pos - 1;
1627 return SEQ_START_TOKEN;
1629 return sel_avc_get_stat_idx(&n);
1632 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1634 return sel_avc_get_stat_idx(pos);
1637 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1639 struct avc_cache_stats *st = v;
1641 if (v == SEQ_START_TOKEN) {
1643 "lookups hits misses allocations reclaims frees\n");
1645 unsigned int lookups = st->lookups;
1646 unsigned int misses = st->misses;
1647 unsigned int hits = lookups - misses;
1648 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1649 hits, misses, st->allocations,
1650 st->reclaims, st->frees);
1655 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1658 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1659 .start = sel_avc_stats_seq_start,
1660 .next = sel_avc_stats_seq_next,
1661 .show = sel_avc_stats_seq_show,
1662 .stop = sel_avc_stats_seq_stop,
1665 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1667 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1670 static const struct file_operations sel_avc_cache_stats_ops = {
1671 .open = sel_open_avc_cache_stats,
1673 .llseek = seq_lseek,
1674 .release = seq_release,
1678 static int sel_make_avc_files(struct dentry *dir)
1680 struct super_block *sb = dir->d_sb;
1681 struct selinux_fs_info *fsi = sb->s_fs_info;
1683 static const struct tree_descr files[] = {
1684 { "cache_threshold",
1685 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1686 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1687 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1688 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1692 for (i = 0; i < ARRAY_SIZE(files); i++) {
1693 struct inode *inode;
1694 struct dentry *dentry;
1696 dentry = d_alloc_name(dir, files[i].name);
1700 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1706 inode->i_fop = files[i].ops;
1707 inode->i_ino = ++fsi->last_ino;
1708 d_add(dentry, inode);
1714 static int sel_make_ss_files(struct dentry *dir)
1716 struct super_block *sb = dir->d_sb;
1717 struct selinux_fs_info *fsi = sb->s_fs_info;
1719 static struct tree_descr files[] = {
1720 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1723 for (i = 0; i < ARRAY_SIZE(files); i++) {
1724 struct inode *inode;
1725 struct dentry *dentry;
1727 dentry = d_alloc_name(dir, files[i].name);
1731 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1737 inode->i_fop = files[i].ops;
1738 inode->i_ino = ++fsi->last_ino;
1739 d_add(dentry, inode);
1745 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1746 size_t count, loff_t *ppos)
1748 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1753 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1754 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1758 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1763 static const struct file_operations sel_initcon_ops = {
1764 .read = sel_read_initcon,
1765 .llseek = generic_file_llseek,
1768 static int sel_make_initcon_files(struct dentry *dir)
1772 for (i = 1; i <= SECINITSID_NUM; i++) {
1773 struct inode *inode;
1774 struct dentry *dentry;
1775 const char *s = security_get_initial_sid_context(i);
1779 dentry = d_alloc_name(dir, s);
1783 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1789 inode->i_fop = &sel_initcon_ops;
1790 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1791 d_add(dentry, inode);
1797 static inline unsigned long sel_class_to_ino(u16 class)
1799 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1802 static inline u16 sel_ino_to_class(unsigned long ino)
1804 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1807 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1809 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1812 static inline u32 sel_ino_to_perm(unsigned long ino)
1814 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1817 static ssize_t sel_read_class(struct file *file, char __user *buf,
1818 size_t count, loff_t *ppos)
1820 unsigned long ino = file_inode(file)->i_ino;
1821 char res[TMPBUFLEN];
1822 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1823 return simple_read_from_buffer(buf, count, ppos, res, len);
1826 static const struct file_operations sel_class_ops = {
1827 .read = sel_read_class,
1828 .llseek = generic_file_llseek,
1831 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1832 size_t count, loff_t *ppos)
1834 unsigned long ino = file_inode(file)->i_ino;
1835 char res[TMPBUFLEN];
1836 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1837 return simple_read_from_buffer(buf, count, ppos, res, len);
1840 static const struct file_operations sel_perm_ops = {
1841 .read = sel_read_perm,
1842 .llseek = generic_file_llseek,
1845 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1846 size_t count, loff_t *ppos)
1848 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1850 char tmpbuf[TMPBUFLEN];
1852 unsigned long i_ino = file_inode(file)->i_ino;
1854 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1855 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1857 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1860 static const struct file_operations sel_policycap_ops = {
1861 .read = sel_read_policycap,
1862 .llseek = generic_file_llseek,
1865 static int sel_make_perm_files(struct selinux_policy *newpolicy,
1866 char *objclass, int classvalue,
1872 rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1876 for (i = 0; i < nperms; i++) {
1877 struct inode *inode;
1878 struct dentry *dentry;
1881 dentry = d_alloc_name(dir, perms[i]);
1886 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1892 inode->i_fop = &sel_perm_ops;
1893 /* i+1 since perm values are 1-indexed */
1894 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1895 d_add(dentry, inode);
1899 for (i = 0; i < nperms; i++)
1905 static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1906 char *classname, int index,
1909 struct super_block *sb = dir->d_sb;
1910 struct selinux_fs_info *fsi = sb->s_fs_info;
1911 struct dentry *dentry = NULL;
1912 struct inode *inode = NULL;
1915 dentry = d_alloc_name(dir, "index");
1919 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1925 inode->i_fop = &sel_class_ops;
1926 inode->i_ino = sel_class_to_ino(index);
1927 d_add(dentry, inode);
1929 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1931 return PTR_ERR(dentry);
1933 rc = sel_make_perm_files(newpolicy, classname, index, dentry);
1938 static int sel_make_classes(struct selinux_policy *newpolicy,
1939 struct dentry *class_dir,
1940 unsigned long *last_class_ino)
1943 int rc, nclasses, i;
1946 rc = security_get_classes(newpolicy, &classes, &nclasses);
1950 /* +2 since classes are 1-indexed */
1951 *last_class_ino = sel_class_to_ino(nclasses + 2);
1953 for (i = 0; i < nclasses; i++) {
1954 struct dentry *class_name_dir;
1956 class_name_dir = sel_make_dir(class_dir, classes[i],
1958 if (IS_ERR(class_name_dir)) {
1959 rc = PTR_ERR(class_name_dir);
1963 /* i+1 since class values are 1-indexed */
1964 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1971 for (i = 0; i < nclasses; i++)
1977 static int sel_make_policycap(struct selinux_fs_info *fsi)
1980 struct dentry *dentry = NULL;
1981 struct inode *inode = NULL;
1983 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1984 if (iter < ARRAY_SIZE(selinux_policycap_names))
1985 dentry = d_alloc_name(fsi->policycap_dir,
1986 selinux_policycap_names[iter]);
1988 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1993 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1994 if (inode == NULL) {
1999 inode->i_fop = &sel_policycap_ops;
2000 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
2001 d_add(dentry, inode);
2007 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2010 struct dentry *dentry = d_alloc_name(dir, name);
2011 struct inode *inode;
2014 return ERR_PTR(-ENOMEM);
2016 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2019 return ERR_PTR(-ENOMEM);
2022 inode->i_op = &simple_dir_inode_operations;
2023 inode->i_fop = &simple_dir_operations;
2024 inode->i_ino = ++(*ino);
2025 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2027 d_add(dentry, inode);
2028 /* bump link count on parent directory, too */
2029 inc_nlink(d_inode(dir));
2034 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2037 struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2040 return ERR_PTR(-ENOMEM);
2042 inode->i_op = &simple_dir_inode_operations;
2043 inode->i_fop = &simple_dir_operations;
2044 inode->i_ino = ++(*ino);
2045 /* directory inodes start off with i_nlink == 2 (for "." entry) */
2047 return d_obtain_alias(inode);
2050 #define NULL_FILE_NAME "null"
2052 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2054 struct selinux_fs_info *fsi;
2056 struct dentry *dentry;
2057 struct inode *inode;
2058 struct inode_security_struct *isec;
2060 static const struct tree_descr selinux_files[] = {
2061 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2062 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2063 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2064 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2065 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2066 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2067 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2068 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2069 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2070 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2071 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2072 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2073 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2074 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2075 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2076 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2077 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2078 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2083 ret = selinux_fs_info_create(sb);
2087 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2091 fsi = sb->s_fs_info;
2092 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2093 if (IS_ERR(fsi->bool_dir)) {
2094 ret = PTR_ERR(fsi->bool_dir);
2095 fsi->bool_dir = NULL;
2100 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2105 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2111 inode->i_ino = ++fsi->last_ino;
2112 isec = selinux_inode(inode);
2113 isec->sid = SECINITSID_DEVNULL;
2114 isec->sclass = SECCLASS_CHR_FILE;
2115 isec->initialized = LABEL_INITIALIZED;
2117 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2118 d_add(dentry, inode);
2120 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2121 if (IS_ERR(dentry)) {
2122 ret = PTR_ERR(dentry);
2126 ret = sel_make_avc_files(dentry);
2130 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2131 if (IS_ERR(dentry)) {
2132 ret = PTR_ERR(dentry);
2136 ret = sel_make_ss_files(dentry);
2140 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2141 if (IS_ERR(dentry)) {
2142 ret = PTR_ERR(dentry);
2146 ret = sel_make_initcon_files(dentry);
2150 fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2151 if (IS_ERR(fsi->class_dir)) {
2152 ret = PTR_ERR(fsi->class_dir);
2153 fsi->class_dir = NULL;
2157 fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2159 if (IS_ERR(fsi->policycap_dir)) {
2160 ret = PTR_ERR(fsi->policycap_dir);
2161 fsi->policycap_dir = NULL;
2165 ret = sel_make_policycap(fsi);
2167 pr_err("SELinux: failed to load policy capabilities\n");
2173 pr_err("SELinux: %s: failed while creating inodes\n",
2176 selinux_fs_info_free(sb);
2181 static int sel_get_tree(struct fs_context *fc)
2183 return get_tree_single(fc, sel_fill_super);
2186 static const struct fs_context_operations sel_context_ops = {
2187 .get_tree = sel_get_tree,
2190 static int sel_init_fs_context(struct fs_context *fc)
2192 fc->ops = &sel_context_ops;
2196 static void sel_kill_sb(struct super_block *sb)
2198 selinux_fs_info_free(sb);
2199 kill_litter_super(sb);
2202 static struct file_system_type sel_fs_type = {
2203 .name = "selinuxfs",
2204 .init_fs_context = sel_init_fs_context,
2205 .kill_sb = sel_kill_sb,
2208 struct vfsmount *selinuxfs_mount;
2209 struct path selinux_null;
2211 static int __init init_sel_fs(void)
2213 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2214 sizeof(NULL_FILE_NAME)-1);
2217 if (!selinux_enabled_boot)
2220 err = sysfs_create_mount_point(fs_kobj, "selinux");
2224 err = register_filesystem(&sel_fs_type);
2226 sysfs_remove_mount_point(fs_kobj, "selinux");
2230 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2231 if (IS_ERR(selinuxfs_mount)) {
2232 pr_err("selinuxfs: could not mount!\n");
2233 err = PTR_ERR(selinuxfs_mount);
2234 selinuxfs_mount = NULL;
2236 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2238 if (IS_ERR(selinux_null.dentry)) {
2239 pr_err("selinuxfs: could not lookup null!\n");
2240 err = PTR_ERR(selinux_null.dentry);
2241 selinux_null.dentry = NULL;
2247 __initcall(init_sel_fs);
2249 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2250 void exit_sel_fs(void)
2252 sysfs_remove_mount_point(fs_kobj, "selinux");
2253 dput(selinux_null.dentry);
2254 kern_unmount(selinuxfs_mount);
2255 unregister_filesystem(&sel_fs_type);