1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 * Added conditional policy language extensions
5 * Updated: Hewlett-Packard <paul.moore@hp.com>
7 * Added support for the policy capability bitmap
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
40 #include "conditional.h"
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
50 static int __init checkreqprot_setup(char *str)
52 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
57 __setup("checkreqprot=", checkreqprot_setup);
59 static DEFINE_MUTEX(sel_mutex);
61 /* global data for booleans */
62 static struct dentry *bool_dir;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
71 static char policy_opened;
73 /* global data for policy capabilities */
74 static struct dentry *policycap_dir;
76 extern void selnl_notify_setenforce(int val);
78 /* Check whether a task is allowed to use a security operation. */
79 static int task_has_security(struct task_struct *tsk,
82 const struct task_security_struct *tsec;
86 tsec = __task_cred(tsk)->security;
93 return avc_has_perm(sid, SECINITSID_SECURITY,
94 SECCLASS_SECURITY, perms, NULL);
99 SEL_LOAD, /* load policy */
100 SEL_ENFORCE, /* get or set enforcing status */
101 SEL_CONTEXT, /* validate context */
102 SEL_ACCESS, /* compute access decision */
103 SEL_CREATE, /* compute create labeling decision */
104 SEL_RELABEL, /* compute relabeling decision */
105 SEL_USER, /* compute reachable user contexts */
106 SEL_POLICYVERS, /* return policy version for this kernel */
107 SEL_COMMIT_BOOLS, /* commit new boolean values */
108 SEL_MLS, /* return if MLS policy is enabled */
109 SEL_DISABLE, /* disable SELinux until next reboot */
110 SEL_MEMBER, /* compute polyinstantiation membership decision */
111 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
112 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
113 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
114 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
115 SEL_STATUS, /* export current status using mmap() */
116 SEL_POLICY, /* allow userspace to read the in kernel policy */
117 SEL_INO_NEXT, /* The next inode number to use */
120 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
122 #define SEL_INITCON_INO_OFFSET 0x01000000
123 #define SEL_BOOL_INO_OFFSET 0x02000000
124 #define SEL_CLASS_INO_OFFSET 0x04000000
125 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
126 #define SEL_INO_MASK 0x00ffffff
129 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
130 size_t count, loff_t *ppos)
132 char tmpbuf[TMPBUFLEN];
135 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
136 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
139 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
140 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
141 size_t count, loff_t *ppos)
148 if (count >= PAGE_SIZE)
151 /* No partial writes. */
154 page = (char *)get_zeroed_page(GFP_KERNEL);
158 if (copy_from_user(page, buf, count))
162 if (sscanf(page, "%d", &new_value) != 1)
165 if (new_value != selinux_enforcing) {
166 length = task_has_security(current, SECURITY__SETENFORCE);
169 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
171 new_value, selinux_enforcing,
172 audit_get_loginuid(current),
173 audit_get_sessionid(current));
174 selinux_enforcing = new_value;
175 if (selinux_enforcing)
177 selnl_notify_setenforce(selinux_enforcing);
178 selinux_status_update_setenforce(selinux_enforcing);
182 free_page((unsigned long) page);
186 #define sel_write_enforce NULL
189 static const struct file_operations sel_enforce_ops = {
190 .read = sel_read_enforce,
191 .write = sel_write_enforce,
192 .llseek = generic_file_llseek,
195 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
196 size_t count, loff_t *ppos)
198 char tmpbuf[TMPBUFLEN];
200 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
201 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
202 security_get_reject_unknown() : !security_get_allow_unknown();
204 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
205 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
208 static const struct file_operations sel_handle_unknown_ops = {
209 .read = sel_read_handle_unknown,
210 .llseek = generic_file_llseek,
213 static int sel_open_handle_status(struct inode *inode, struct file *filp)
215 struct page *status = selinux_kernel_status_page();
220 filp->private_data = status;
225 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
226 size_t count, loff_t *ppos)
228 struct page *status = filp->private_data;
232 return simple_read_from_buffer(buf, count, ppos,
233 page_address(status),
234 sizeof(struct selinux_kernel_status));
237 static int sel_mmap_handle_status(struct file *filp,
238 struct vm_area_struct *vma)
240 struct page *status = filp->private_data;
241 unsigned long size = vma->vm_end - vma->vm_start;
245 /* only allows one page from the head */
246 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
248 /* disallow writable mapping */
249 if (vma->vm_flags & VM_WRITE)
251 /* disallow mprotect() turns it into writable */
252 vma->vm_flags &= ~VM_MAYWRITE;
254 return remap_pfn_range(vma, vma->vm_start,
256 size, vma->vm_page_prot);
259 static const struct file_operations sel_handle_status_ops = {
260 .open = sel_open_handle_status,
261 .read = sel_read_handle_status,
262 .mmap = sel_mmap_handle_status,
263 .llseek = generic_file_llseek,
266 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
267 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
268 size_t count, loff_t *ppos)
274 extern int selinux_disable(void);
276 if (count >= PAGE_SIZE)
279 /* No partial writes. */
282 page = (char *)get_zeroed_page(GFP_KERNEL);
286 if (copy_from_user(page, buf, count))
290 if (sscanf(page, "%d", &new_value) != 1)
294 length = selinux_disable();
297 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
298 "selinux=0 auid=%u ses=%u",
299 audit_get_loginuid(current),
300 audit_get_sessionid(current));
305 free_page((unsigned long) page);
309 #define sel_write_disable NULL
312 static const struct file_operations sel_disable_ops = {
313 .write = sel_write_disable,
314 .llseek = generic_file_llseek,
317 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
318 size_t count, loff_t *ppos)
320 char tmpbuf[TMPBUFLEN];
323 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
324 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
327 static const struct file_operations sel_policyvers_ops = {
328 .read = sel_read_policyvers,
329 .llseek = generic_file_llseek,
332 /* declaration for sel_write_load */
333 static int sel_make_bools(void);
334 static int sel_make_classes(void);
335 static int sel_make_policycap(void);
337 /* declaration for sel_make_class_dirs */
338 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
341 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
342 size_t count, loff_t *ppos)
344 char tmpbuf[TMPBUFLEN];
347 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
348 security_mls_enabled());
349 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
352 static const struct file_operations sel_mls_ops = {
353 .read = sel_read_mls,
354 .llseek = generic_file_llseek,
357 struct policy_load_memory {
362 static int sel_open_policy(struct inode *inode, struct file *filp)
364 struct policy_load_memory *plm = NULL;
367 BUG_ON(filp->private_data);
369 mutex_lock(&sel_mutex);
371 rc = task_has_security(current, SECURITY__READ_POLICY);
380 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
384 if (i_size_read(inode) != security_policydb_len()) {
385 mutex_lock(&inode->i_mutex);
386 i_size_write(inode, security_policydb_len());
387 mutex_unlock(&inode->i_mutex);
390 rc = security_read_policy(&plm->data, &plm->len);
396 filp->private_data = plm;
398 mutex_unlock(&sel_mutex);
402 mutex_unlock(&sel_mutex);
410 static int sel_release_policy(struct inode *inode, struct file *filp)
412 struct policy_load_memory *plm = filp->private_data;
424 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
425 size_t count, loff_t *ppos)
427 struct policy_load_memory *plm = filp->private_data;
430 mutex_lock(&sel_mutex);
432 ret = task_has_security(current, SECURITY__READ_POLICY);
436 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
438 mutex_unlock(&sel_mutex);
442 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
443 struct vm_fault *vmf)
445 struct policy_load_memory *plm = vma->vm_file->private_data;
446 unsigned long offset;
449 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
450 return VM_FAULT_SIGBUS;
452 offset = vmf->pgoff << PAGE_SHIFT;
453 if (offset >= roundup(plm->len, PAGE_SIZE))
454 return VM_FAULT_SIGBUS;
456 page = vmalloc_to_page(plm->data + offset);
464 static struct vm_operations_struct sel_mmap_policy_ops = {
465 .fault = sel_mmap_policy_fault,
466 .page_mkwrite = sel_mmap_policy_fault,
469 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
471 if (vma->vm_flags & VM_SHARED) {
472 /* do not allow mprotect to make mapping writable */
473 vma->vm_flags &= ~VM_MAYWRITE;
475 if (vma->vm_flags & VM_WRITE)
479 vma->vm_flags |= VM_RESERVED;
480 vma->vm_ops = &sel_mmap_policy_ops;
485 static const struct file_operations sel_policy_ops = {
486 .open = sel_open_policy,
487 .read = sel_read_policy,
488 .mmap = sel_mmap_policy,
489 .release = sel_release_policy,
492 static ssize_t sel_write_load(struct file *file, const char __user *buf,
493 size_t count, loff_t *ppos)
500 mutex_lock(&sel_mutex);
502 length = task_has_security(current, SECURITY__LOAD_POLICY);
507 /* No partial writes. */
512 if ((count > 64 * 1024 * 1024)
513 || (data = vmalloc(count)) == NULL) {
519 if (copy_from_user(data, buf, count) != 0)
522 length = security_load_policy(data, count);
526 ret = sel_make_bools();
532 ret = sel_make_classes();
538 ret = sel_make_policycap();
545 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
546 "policy loaded auid=%u ses=%u",
547 audit_get_loginuid(current),
548 audit_get_sessionid(current));
550 mutex_unlock(&sel_mutex);
555 static const struct file_operations sel_load_ops = {
556 .write = sel_write_load,
557 .llseek = generic_file_llseek,
560 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
566 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
570 length = security_context_to_sid(buf, size, &sid);
574 length = security_sid_to_context(sid, &canon, &len);
578 if (len > SIMPLE_TRANSACTION_LIMIT) {
579 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
580 "payload max\n", __func__, len);
585 memcpy(buf, canon, len);
592 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
593 size_t count, loff_t *ppos)
595 char tmpbuf[TMPBUFLEN];
598 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
599 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
602 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
603 size_t count, loff_t *ppos)
607 unsigned int new_value;
609 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
613 if (count >= PAGE_SIZE)
616 /* No partial writes. */
619 page = (char *)get_zeroed_page(GFP_KERNEL);
623 if (copy_from_user(page, buf, count))
627 if (sscanf(page, "%u", &new_value) != 1)
630 selinux_checkreqprot = new_value ? 1 : 0;
633 free_page((unsigned long) page);
636 static const struct file_operations sel_checkreqprot_ops = {
637 .read = sel_read_checkreqprot,
638 .write = sel_write_checkreqprot,
639 .llseek = generic_file_llseek,
643 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
645 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
646 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
647 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
648 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
649 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
651 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
652 [SEL_ACCESS] = sel_write_access,
653 [SEL_CREATE] = sel_write_create,
654 [SEL_RELABEL] = sel_write_relabel,
655 [SEL_USER] = sel_write_user,
656 [SEL_MEMBER] = sel_write_member,
657 [SEL_CONTEXT] = sel_write_context,
660 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
662 ino_t ino = file->f_path.dentry->d_inode->i_ino;
666 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
669 data = simple_transaction_get(file, buf, size);
671 return PTR_ERR(data);
673 rv = write_op[ino](file, data, size);
675 simple_transaction_set(file, rv);
681 static const struct file_operations transaction_ops = {
682 .write = selinux_transaction_write,
683 .read = simple_transaction_read,
684 .release = simple_transaction_release,
685 .llseek = generic_file_llseek,
689 * payload - write methods
690 * If the method has a response, the response should be put in buf,
691 * and the length returned. Otherwise return 0 or and -error.
694 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
699 struct av_decision avd;
702 length = task_has_security(current, SECURITY__COMPUTE_AV);
707 scon = kzalloc(size + 1, GFP_KERNEL);
711 tcon = kzalloc(size + 1, GFP_KERNEL);
716 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
719 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
722 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
726 security_compute_av_user(ssid, tsid, tclass, &avd);
728 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
730 avd.allowed, 0xffffffff,
731 avd.auditallow, avd.auditdeny,
732 avd.seqno, avd.flags);
740 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
743 u32 ssid, tsid, newsid;
749 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
754 scon = kzalloc(size + 1, GFP_KERNEL);
758 tcon = kzalloc(size + 1, GFP_KERNEL);
763 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
766 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
769 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
773 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
777 length = security_sid_to_context(newsid, &newcon, &len);
781 if (len > SIMPLE_TRANSACTION_LIMIT) {
782 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
783 "payload max\n", __func__, len);
788 memcpy(buf, newcon, len);
799 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
802 u32 ssid, tsid, newsid;
808 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
813 scon = kzalloc(size + 1, GFP_KERNEL);
817 tcon = kzalloc(size + 1, GFP_KERNEL);
822 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
825 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
828 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
832 length = security_change_sid(ssid, tsid, tclass, &newsid);
836 length = security_sid_to_context(newsid, &newcon, &len);
840 if (len > SIMPLE_TRANSACTION_LIMIT) {
845 memcpy(buf, newcon, len);
856 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
858 char *con, *user, *ptr;
865 length = task_has_security(current, SECURITY__COMPUTE_USER);
870 con = kzalloc(size + 1, GFP_KERNEL);
874 user = kzalloc(size + 1, GFP_KERNEL);
879 if (sscanf(buf, "%s %s", con, user) != 2)
882 length = security_context_to_sid(con, strlen(con) + 1, &sid);
886 length = security_get_user_sids(sid, user, &sids, &nsids);
890 length = sprintf(buf, "%u", nsids) + 1;
892 for (i = 0; i < nsids; i++) {
893 rc = security_sid_to_context(sids[i], &newcon, &len);
898 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
903 memcpy(ptr, newcon, len);
917 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
920 u32 ssid, tsid, newsid;
926 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
931 scon = kzalloc(size + 1, GFP_KERNEL);
935 tcon = kzalloc(size + 1, GFP_KERNEL);
940 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
943 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
946 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
950 length = security_member_sid(ssid, tsid, tclass, &newsid);
954 length = security_sid_to_context(newsid, &newcon, &len);
958 if (len > SIMPLE_TRANSACTION_LIMIT) {
959 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
960 "payload max\n", __func__, len);
965 memcpy(buf, newcon, len);
976 static struct inode *sel_make_inode(struct super_block *sb, int mode)
978 struct inode *ret = new_inode(sb);
982 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
987 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
988 size_t count, loff_t *ppos)
994 struct inode *inode = filep->f_path.dentry->d_inode;
995 unsigned index = inode->i_ino & SEL_INO_MASK;
996 const char *name = filep->f_path.dentry->d_name.name;
998 mutex_lock(&sel_mutex);
1000 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
1005 page = (char *)get_zeroed_page(GFP_KERNEL);
1011 cur_enforcing = security_get_bool_value(index);
1012 if (cur_enforcing < 0) {
1013 ret = cur_enforcing;
1016 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1017 bool_pending_values[index]);
1018 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1020 mutex_unlock(&sel_mutex);
1022 free_page((unsigned long)page);
1026 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1027 size_t count, loff_t *ppos)
1032 struct inode *inode = filep->f_path.dentry->d_inode;
1033 unsigned index = inode->i_ino & SEL_INO_MASK;
1034 const char *name = filep->f_path.dentry->d_name.name;
1036 mutex_lock(&sel_mutex);
1038 length = task_has_security(current, SECURITY__SETBOOL);
1042 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
1047 if (count >= PAGE_SIZE) {
1053 /* No partial writes. */
1057 page = (char *)get_zeroed_page(GFP_KERNEL);
1064 if (copy_from_user(page, buf, count))
1068 if (sscanf(page, "%d", &new_value) != 1)
1074 bool_pending_values[index] = new_value;
1078 mutex_unlock(&sel_mutex);
1080 free_page((unsigned long) page);
1084 static const struct file_operations sel_bool_ops = {
1085 .read = sel_read_bool,
1086 .write = sel_write_bool,
1087 .llseek = generic_file_llseek,
1090 static ssize_t sel_commit_bools_write(struct file *filep,
1091 const char __user *buf,
1092 size_t count, loff_t *ppos)
1098 mutex_lock(&sel_mutex);
1100 length = task_has_security(current, SECURITY__SETBOOL);
1104 if (count >= PAGE_SIZE) {
1109 /* No partial writes. */
1112 page = (char *)get_zeroed_page(GFP_KERNEL);
1119 if (copy_from_user(page, buf, count))
1123 if (sscanf(page, "%d", &new_value) != 1)
1126 if (new_value && bool_pending_values)
1127 security_set_bools(bool_num, bool_pending_values);
1132 mutex_unlock(&sel_mutex);
1134 free_page((unsigned long) page);
1138 static const struct file_operations sel_commit_bools_ops = {
1139 .write = sel_commit_bools_write,
1140 .llseek = generic_file_llseek,
1143 static void sel_remove_entries(struct dentry *de)
1145 struct list_head *node;
1147 spin_lock(&dcache_lock);
1148 node = de->d_subdirs.next;
1149 while (node != &de->d_subdirs) {
1150 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1151 list_del_init(node);
1155 spin_unlock(&dcache_lock);
1157 simple_unlink(de->d_inode, d);
1159 spin_lock(&dcache_lock);
1161 node = de->d_subdirs.next;
1164 spin_unlock(&dcache_lock);
1167 #define BOOL_DIR_NAME "booleans"
1169 static int sel_make_bools(void)
1173 struct dentry *dentry = NULL;
1174 struct dentry *dir = bool_dir;
1175 struct inode *inode = NULL;
1176 struct inode_security_struct *isec;
1177 char **names = NULL, *page;
1182 /* remove any existing files */
1183 for (i = 0; i < bool_num; i++)
1184 kfree(bool_pending_names[i]);
1185 kfree(bool_pending_names);
1186 kfree(bool_pending_values);
1187 bool_pending_names = NULL;
1188 bool_pending_values = NULL;
1190 sel_remove_entries(dir);
1192 page = (char *)get_zeroed_page(GFP_KERNEL);
1196 ret = security_get_bools(&num, &names, &values);
1200 for (i = 0; i < num; i++) {
1201 dentry = d_alloc_name(dir, names[i]);
1206 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1212 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1216 } else if (len >= PAGE_SIZE) {
1217 ret = -ENAMETOOLONG;
1220 isec = (struct inode_security_struct *)inode->i_security;
1221 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1225 isec->initialized = 1;
1226 inode->i_fop = &sel_bool_ops;
1227 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1228 d_add(dentry, inode);
1231 bool_pending_names = names;
1232 bool_pending_values = values;
1234 free_page((unsigned long)page);
1238 for (i = 0; i < num; i++)
1243 sel_remove_entries(dir);
1248 #define NULL_FILE_NAME "null"
1250 struct dentry *selinux_null;
1252 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1253 size_t count, loff_t *ppos)
1255 char tmpbuf[TMPBUFLEN];
1258 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1259 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1262 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1263 const char __user *buf,
1264 size_t count, loff_t *ppos)
1271 if (count >= PAGE_SIZE) {
1277 /* No partial writes. */
1282 page = (char *)get_zeroed_page(GFP_KERNEL);
1288 if (copy_from_user(page, buf, count)) {
1293 if (sscanf(page, "%u", &new_value) != 1) {
1298 if (new_value != avc_cache_threshold) {
1299 ret = task_has_security(current, SECURITY__SETSECPARAM);
1302 avc_cache_threshold = new_value;
1306 free_page((unsigned long)page);
1311 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1312 size_t count, loff_t *ppos)
1317 page = (char *)__get_free_page(GFP_KERNEL);
1322 ret = avc_get_hash_stats(page);
1324 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1325 free_page((unsigned long)page);
1330 static const struct file_operations sel_avc_cache_threshold_ops = {
1331 .read = sel_read_avc_cache_threshold,
1332 .write = sel_write_avc_cache_threshold,
1333 .llseek = generic_file_llseek,
1336 static const struct file_operations sel_avc_hash_stats_ops = {
1337 .read = sel_read_avc_hash_stats,
1338 .llseek = generic_file_llseek,
1341 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1342 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1346 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1347 if (!cpu_possible(cpu))
1350 return &per_cpu(avc_cache_stats, cpu);
1355 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1357 loff_t n = *pos - 1;
1360 return SEQ_START_TOKEN;
1362 return sel_avc_get_stat_idx(&n);
1365 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1367 return sel_avc_get_stat_idx(pos);
1370 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1372 struct avc_cache_stats *st = v;
1374 if (v == SEQ_START_TOKEN)
1375 seq_printf(seq, "lookups hits misses allocations reclaims "
1378 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1379 st->hits, st->misses, st->allocations,
1380 st->reclaims, st->frees);
1384 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1387 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1388 .start = sel_avc_stats_seq_start,
1389 .next = sel_avc_stats_seq_next,
1390 .show = sel_avc_stats_seq_show,
1391 .stop = sel_avc_stats_seq_stop,
1394 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1396 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1399 static const struct file_operations sel_avc_cache_stats_ops = {
1400 .open = sel_open_avc_cache_stats,
1402 .llseek = seq_lseek,
1403 .release = seq_release,
1407 static int sel_make_avc_files(struct dentry *dir)
1410 static struct tree_descr files[] = {
1411 { "cache_threshold",
1412 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1413 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1414 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1415 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1419 for (i = 0; i < ARRAY_SIZE(files); i++) {
1420 struct inode *inode;
1421 struct dentry *dentry;
1423 dentry = d_alloc_name(dir, files[i].name);
1429 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1434 inode->i_fop = files[i].ops;
1435 inode->i_ino = ++sel_last_ino;
1436 d_add(dentry, inode);
1442 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1443 size_t count, loff_t *ppos)
1445 struct inode *inode;
1450 inode = file->f_path.dentry->d_inode;
1451 sid = inode->i_ino&SEL_INO_MASK;
1452 ret = security_sid_to_context(sid, &con, &len);
1456 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1461 static const struct file_operations sel_initcon_ops = {
1462 .read = sel_read_initcon,
1463 .llseek = generic_file_llseek,
1466 static int sel_make_initcon_files(struct dentry *dir)
1470 for (i = 1; i <= SECINITSID_NUM; i++) {
1471 struct inode *inode;
1472 struct dentry *dentry;
1473 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1479 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1484 inode->i_fop = &sel_initcon_ops;
1485 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1486 d_add(dentry, inode);
1492 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1494 return a / b - (a % b < 0);
1497 static inline unsigned long sel_class_to_ino(u16 class)
1499 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1502 static inline u16 sel_ino_to_class(unsigned long ino)
1504 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1507 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1509 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1512 static inline u32 sel_ino_to_perm(unsigned long ino)
1514 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1517 static ssize_t sel_read_class(struct file *file, char __user *buf,
1518 size_t count, loff_t *ppos)
1522 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1524 page = (char *)__get_free_page(GFP_KERNEL);
1530 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1531 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1532 free_page((unsigned long)page);
1537 static const struct file_operations sel_class_ops = {
1538 .read = sel_read_class,
1539 .llseek = generic_file_llseek,
1542 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1543 size_t count, loff_t *ppos)
1547 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1549 page = (char *)__get_free_page(GFP_KERNEL);
1555 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1556 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1557 free_page((unsigned long)page);
1562 static const struct file_operations sel_perm_ops = {
1563 .read = sel_read_perm,
1564 .llseek = generic_file_llseek,
1567 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1568 size_t count, loff_t *ppos)
1571 char tmpbuf[TMPBUFLEN];
1573 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1575 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1576 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1578 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1581 static const struct file_operations sel_policycap_ops = {
1582 .read = sel_read_policycap,
1583 .llseek = generic_file_llseek,
1586 static int sel_make_perm_files(char *objclass, int classvalue,
1589 int i, rc = 0, nperms;
1592 rc = security_get_permissions(objclass, &perms, &nperms);
1596 for (i = 0; i < nperms; i++) {
1597 struct inode *inode;
1598 struct dentry *dentry;
1600 dentry = d_alloc_name(dir, perms[i]);
1606 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1611 inode->i_fop = &sel_perm_ops;
1612 /* i+1 since perm values are 1-indexed */
1613 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1614 d_add(dentry, inode);
1618 for (i = 0; i < nperms; i++)
1625 static int sel_make_class_dir_entries(char *classname, int index,
1628 struct dentry *dentry = NULL;
1629 struct inode *inode = NULL;
1632 dentry = d_alloc_name(dir, "index");
1638 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1644 inode->i_fop = &sel_class_ops;
1645 inode->i_ino = sel_class_to_ino(index);
1646 d_add(dentry, inode);
1648 dentry = d_alloc_name(dir, "perms");
1654 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1658 rc = sel_make_perm_files(classname, index, dentry);
1664 static void sel_remove_classes(void)
1666 struct list_head *class_node;
1668 list_for_each(class_node, &class_dir->d_subdirs) {
1669 struct dentry *class_subdir = list_entry(class_node,
1670 struct dentry, d_u.d_child);
1671 struct list_head *class_subdir_node;
1673 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1674 struct dentry *d = list_entry(class_subdir_node,
1675 struct dentry, d_u.d_child);
1678 if (d->d_inode->i_mode & S_IFDIR)
1679 sel_remove_entries(d);
1682 sel_remove_entries(class_subdir);
1685 sel_remove_entries(class_dir);
1688 static int sel_make_classes(void)
1690 int rc = 0, nclasses, i;
1693 /* delete any existing entries */
1694 sel_remove_classes();
1696 rc = security_get_classes(&classes, &nclasses);
1700 /* +2 since classes are 1-indexed */
1701 last_class_ino = sel_class_to_ino(nclasses + 2);
1703 for (i = 0; i < nclasses; i++) {
1704 struct dentry *class_name_dir;
1706 class_name_dir = d_alloc_name(class_dir, classes[i]);
1707 if (!class_name_dir) {
1712 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1717 /* i+1 since class values are 1-indexed */
1718 rc = sel_make_class_dir_entries(classes[i], i + 1,
1725 for (i = 0; i < nclasses; i++)
1732 static int sel_make_policycap(void)
1735 struct dentry *dentry = NULL;
1736 struct inode *inode = NULL;
1738 sel_remove_entries(policycap_dir);
1740 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1741 if (iter < ARRAY_SIZE(policycap_names))
1742 dentry = d_alloc_name(policycap_dir,
1743 policycap_names[iter]);
1745 dentry = d_alloc_name(policycap_dir, "unknown");
1750 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1754 inode->i_fop = &sel_policycap_ops;
1755 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1756 d_add(dentry, inode);
1762 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1766 struct inode *inode;
1768 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1773 inode->i_op = &simple_dir_inode_operations;
1774 inode->i_fop = &simple_dir_operations;
1775 inode->i_ino = ++(*ino);
1776 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1778 d_add(dentry, inode);
1779 /* bump link count on parent directory, too */
1785 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1788 struct dentry *dentry;
1789 struct inode *inode, *root_inode;
1790 struct inode_security_struct *isec;
1792 static struct tree_descr selinux_files[] = {
1793 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1794 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1795 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1799 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1800 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1801 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1802 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1803 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1804 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1805 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1806 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1807 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1808 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1809 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1812 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1816 root_inode = sb->s_root->d_inode;
1818 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1824 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1830 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1836 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1841 inode->i_ino = ++sel_last_ino;
1842 isec = (struct inode_security_struct *)inode->i_security;
1843 isec->sid = SECINITSID_DEVNULL;
1844 isec->sclass = SECCLASS_CHR_FILE;
1845 isec->initialized = 1;
1847 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1848 d_add(dentry, inode);
1849 selinux_null = dentry;
1851 dentry = d_alloc_name(sb->s_root, "avc");
1857 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1861 ret = sel_make_avc_files(dentry);
1865 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1871 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1875 ret = sel_make_initcon_files(dentry);
1879 dentry = d_alloc_name(sb->s_root, "class");
1885 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1891 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1897 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1901 policycap_dir = dentry;
1906 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1911 static int sel_get_sb(struct file_system_type *fs_type,
1912 int flags, const char *dev_name, void *data,
1913 struct vfsmount *mnt)
1915 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1918 static struct file_system_type sel_fs_type = {
1919 .name = "selinuxfs",
1920 .get_sb = sel_get_sb,
1921 .kill_sb = kill_litter_super,
1924 struct vfsmount *selinuxfs_mount;
1926 static int __init init_sel_fs(void)
1930 if (!selinux_enabled)
1932 err = register_filesystem(&sel_fs_type);
1934 selinuxfs_mount = kern_mount(&sel_fs_type);
1935 if (IS_ERR(selinuxfs_mount)) {
1936 printk(KERN_ERR "selinuxfs: could not mount!\n");
1937 err = PTR_ERR(selinuxfs_mount);
1938 selinuxfs_mount = NULL;
1944 __initcall(init_sel_fs);
1946 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1947 void exit_sel_fs(void)
1949 unregister_filesystem(&sel_fs_type);