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)
149 if (count >= PAGE_SIZE)
152 /* No partial writes. */
158 page = (char *)get_zeroed_page(GFP_KERNEL);
163 if (copy_from_user(page, buf, count))
167 if (sscanf(page, "%d", &new_value) != 1)
170 if (new_value != selinux_enforcing) {
171 length = task_has_security(current, SECURITY__SETENFORCE);
174 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176 new_value, selinux_enforcing,
177 audit_get_loginuid(current),
178 audit_get_sessionid(current));
179 selinux_enforcing = new_value;
180 if (selinux_enforcing)
182 selnl_notify_setenforce(selinux_enforcing);
183 selinux_status_update_setenforce(selinux_enforcing);
187 free_page((unsigned long) page);
191 #define sel_write_enforce NULL
194 static const struct file_operations sel_enforce_ops = {
195 .read = sel_read_enforce,
196 .write = sel_write_enforce,
197 .llseek = generic_file_llseek,
200 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
201 size_t count, loff_t *ppos)
203 char tmpbuf[TMPBUFLEN];
205 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown() : !security_get_allow_unknown();
209 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
210 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213 static const struct file_operations sel_handle_unknown_ops = {
214 .read = sel_read_handle_unknown,
215 .llseek = generic_file_llseek,
218 static int sel_open_handle_status(struct inode *inode, struct file *filp)
220 struct page *status = selinux_kernel_status_page();
225 filp->private_data = status;
230 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
231 size_t count, loff_t *ppos)
233 struct page *status = filp->private_data;
237 return simple_read_from_buffer(buf, count, ppos,
238 page_address(status),
239 sizeof(struct selinux_kernel_status));
242 static int sel_mmap_handle_status(struct file *filp,
243 struct vm_area_struct *vma)
245 struct page *status = filp->private_data;
246 unsigned long size = vma->vm_end - vma->vm_start;
250 /* only allows one page from the head */
251 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
253 /* disallow writable mapping */
254 if (vma->vm_flags & VM_WRITE)
256 /* disallow mprotect() turns it into writable */
257 vma->vm_flags &= ~VM_MAYWRITE;
259 return remap_pfn_range(vma, vma->vm_start,
261 size, vma->vm_page_prot);
264 static const struct file_operations sel_handle_status_ops = {
265 .open = sel_open_handle_status,
266 .read = sel_read_handle_status,
267 .mmap = sel_mmap_handle_status,
268 .llseek = generic_file_llseek,
271 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
272 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
273 size_t count, loff_t *ppos)
279 extern int selinux_disable(void);
282 if (count >= PAGE_SIZE)
285 /* No partial writes. */
291 page = (char *)get_zeroed_page(GFP_KERNEL);
296 if (copy_from_user(page, buf, count))
300 if (sscanf(page, "%d", &new_value) != 1)
304 length = selinux_disable();
307 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
308 "selinux=0 auid=%u ses=%u",
309 audit_get_loginuid(current),
310 audit_get_sessionid(current));
315 free_page((unsigned long) page);
319 #define sel_write_disable NULL
322 static const struct file_operations sel_disable_ops = {
323 .write = sel_write_disable,
324 .llseek = generic_file_llseek,
327 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
328 size_t count, loff_t *ppos)
330 char tmpbuf[TMPBUFLEN];
333 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
334 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
337 static const struct file_operations sel_policyvers_ops = {
338 .read = sel_read_policyvers,
339 .llseek = generic_file_llseek,
342 /* declaration for sel_write_load */
343 static int sel_make_bools(void);
344 static int sel_make_classes(void);
345 static int sel_make_policycap(void);
347 /* declaration for sel_make_class_dirs */
348 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
351 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
352 size_t count, loff_t *ppos)
354 char tmpbuf[TMPBUFLEN];
357 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
358 security_mls_enabled());
359 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
362 static const struct file_operations sel_mls_ops = {
363 .read = sel_read_mls,
364 .llseek = generic_file_llseek,
367 struct policy_load_memory {
372 static int sel_open_policy(struct inode *inode, struct file *filp)
374 struct policy_load_memory *plm = NULL;
377 BUG_ON(filp->private_data);
379 mutex_lock(&sel_mutex);
381 rc = task_has_security(current, SECURITY__READ_POLICY);
390 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
394 if (i_size_read(inode) != security_policydb_len()) {
395 mutex_lock(&inode->i_mutex);
396 i_size_write(inode, security_policydb_len());
397 mutex_unlock(&inode->i_mutex);
400 rc = security_read_policy(&plm->data, &plm->len);
406 filp->private_data = plm;
408 mutex_unlock(&sel_mutex);
412 mutex_unlock(&sel_mutex);
420 static int sel_release_policy(struct inode *inode, struct file *filp)
422 struct policy_load_memory *plm = filp->private_data;
434 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
435 size_t count, loff_t *ppos)
437 struct policy_load_memory *plm = filp->private_data;
440 mutex_lock(&sel_mutex);
442 ret = task_has_security(current, SECURITY__READ_POLICY);
446 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
448 mutex_unlock(&sel_mutex);
452 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
453 struct vm_fault *vmf)
455 struct policy_load_memory *plm = vma->vm_file->private_data;
456 unsigned long offset;
459 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
460 return VM_FAULT_SIGBUS;
462 offset = vmf->pgoff << PAGE_SHIFT;
463 if (offset >= roundup(plm->len, PAGE_SIZE))
464 return VM_FAULT_SIGBUS;
466 page = vmalloc_to_page(plm->data + offset);
474 static struct vm_operations_struct sel_mmap_policy_ops = {
475 .fault = sel_mmap_policy_fault,
476 .page_mkwrite = sel_mmap_policy_fault,
479 int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
481 if (vma->vm_flags & VM_SHARED) {
482 /* do not allow mprotect to make mapping writable */
483 vma->vm_flags &= ~VM_MAYWRITE;
485 if (vma->vm_flags & VM_WRITE)
489 vma->vm_flags |= VM_RESERVED;
490 vma->vm_ops = &sel_mmap_policy_ops;
495 static const struct file_operations sel_policy_ops = {
496 .open = sel_open_policy,
497 .read = sel_read_policy,
498 .mmap = sel_mmap_policy,
499 .release = sel_release_policy,
502 static ssize_t sel_write_load(struct file *file, const char __user *buf,
503 size_t count, loff_t *ppos)
509 mutex_lock(&sel_mutex);
511 length = task_has_security(current, SECURITY__LOAD_POLICY);
515 /* No partial writes. */
521 if (count > 64 * 1024 * 1024)
525 data = vmalloc(count);
530 if (copy_from_user(data, buf, count) != 0)
533 length = security_load_policy(data, count);
537 length = sel_make_bools();
541 length = sel_make_classes();
545 length = sel_make_policycap();
552 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
553 "policy loaded auid=%u ses=%u",
554 audit_get_loginuid(current),
555 audit_get_sessionid(current));
557 mutex_unlock(&sel_mutex);
562 static const struct file_operations sel_load_ops = {
563 .write = sel_write_load,
564 .llseek = generic_file_llseek,
567 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
573 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
577 length = security_context_to_sid(buf, size, &sid);
581 length = security_sid_to_context(sid, &canon, &len);
586 if (len > SIMPLE_TRANSACTION_LIMIT) {
587 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
588 "payload max\n", __func__, len);
592 memcpy(buf, canon, len);
599 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
600 size_t count, loff_t *ppos)
602 char tmpbuf[TMPBUFLEN];
605 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
606 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
609 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
610 size_t count, loff_t *ppos)
614 unsigned int new_value;
616 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
621 if (count >= PAGE_SIZE)
624 /* No partial writes. */
630 page = (char *)get_zeroed_page(GFP_KERNEL);
635 if (copy_from_user(page, buf, count))
639 if (sscanf(page, "%u", &new_value) != 1)
642 selinux_checkreqprot = new_value ? 1 : 0;
645 free_page((unsigned long) page);
648 static const struct file_operations sel_checkreqprot_ops = {
649 .read = sel_read_checkreqprot,
650 .write = sel_write_checkreqprot,
651 .llseek = generic_file_llseek,
655 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
657 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
658 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
659 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
663 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
664 [SEL_ACCESS] = sel_write_access,
665 [SEL_CREATE] = sel_write_create,
666 [SEL_RELABEL] = sel_write_relabel,
667 [SEL_USER] = sel_write_user,
668 [SEL_MEMBER] = sel_write_member,
669 [SEL_CONTEXT] = sel_write_context,
672 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
674 ino_t ino = file->f_path.dentry->d_inode->i_ino;
678 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
681 data = simple_transaction_get(file, buf, size);
683 return PTR_ERR(data);
685 rv = write_op[ino](file, data, size);
687 simple_transaction_set(file, rv);
693 static const struct file_operations transaction_ops = {
694 .write = selinux_transaction_write,
695 .read = simple_transaction_read,
696 .release = simple_transaction_release,
697 .llseek = generic_file_llseek,
701 * payload - write methods
702 * If the method has a response, the response should be put in buf,
703 * and the length returned. Otherwise return 0 or and -error.
706 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
708 char *scon = NULL, *tcon = NULL;
711 struct av_decision avd;
714 length = task_has_security(current, SECURITY__COMPUTE_AV);
719 scon = kzalloc(size + 1, GFP_KERNEL);
724 tcon = kzalloc(size + 1, GFP_KERNEL);
729 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
732 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
736 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
740 security_compute_av_user(ssid, tsid, tclass, &avd);
742 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
744 avd.allowed, 0xffffffff,
745 avd.auditallow, avd.auditdeny,
746 avd.seqno, avd.flags);
753 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
755 char *scon = NULL, *tcon = NULL;
756 u32 ssid, tsid, newsid;
762 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
767 scon = kzalloc(size + 1, GFP_KERNEL);
772 tcon = kzalloc(size + 1, GFP_KERNEL);
777 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
780 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
784 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
788 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
792 length = security_sid_to_context(newsid, &newcon, &len);
797 if (len > SIMPLE_TRANSACTION_LIMIT) {
798 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
799 "payload max\n", __func__, len);
803 memcpy(buf, newcon, len);
812 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
814 char *scon = NULL, *tcon = NULL;
815 u32 ssid, tsid, newsid;
821 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
826 scon = kzalloc(size + 1, GFP_KERNEL);
831 tcon = kzalloc(size + 1, GFP_KERNEL);
836 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
839 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
843 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
847 length = security_change_sid(ssid, tsid, tclass, &newsid);
851 length = security_sid_to_context(newsid, &newcon, &len);
856 if (len > SIMPLE_TRANSACTION_LIMIT)
859 memcpy(buf, newcon, len);
868 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
870 char *con = NULL, *user = NULL, *ptr;
871 u32 sid, *sids = NULL;
877 length = task_has_security(current, SECURITY__COMPUTE_USER);
882 con = kzalloc(size + 1, GFP_KERNEL);
887 user = kzalloc(size + 1, GFP_KERNEL);
892 if (sscanf(buf, "%s %s", con, user) != 2)
895 length = security_context_to_sid(con, strlen(con) + 1, &sid);
899 length = security_get_user_sids(sid, user, &sids, &nsids);
903 length = sprintf(buf, "%u", nsids) + 1;
905 for (i = 0; i < nsids; i++) {
906 rc = security_sid_to_context(sids[i], &newcon, &len);
911 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
916 memcpy(ptr, newcon, len);
928 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
930 char *scon = NULL, *tcon = NULL;
931 u32 ssid, tsid, newsid;
937 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
942 scon = kzalloc(size + 1, GFP_KERNEL);
947 tcon = kzalloc(size + 1, GFP_KERNEL);
952 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
955 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
959 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
963 length = security_member_sid(ssid, tsid, tclass, &newsid);
967 length = security_sid_to_context(newsid, &newcon, &len);
972 if (len > SIMPLE_TRANSACTION_LIMIT) {
973 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
974 "payload max\n", __func__, len);
978 memcpy(buf, newcon, len);
987 static struct inode *sel_make_inode(struct super_block *sb, int mode)
989 struct inode *ret = new_inode(sb);
992 ret->i_ino = get_next_ino();
994 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
999 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1000 size_t count, loff_t *ppos)
1006 struct inode *inode = filep->f_path.dentry->d_inode;
1007 unsigned index = inode->i_ino & SEL_INO_MASK;
1008 const char *name = filep->f_path.dentry->d_name.name;
1010 mutex_lock(&sel_mutex);
1013 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1017 page = (char *)get_zeroed_page(GFP_KERNEL);
1021 cur_enforcing = security_get_bool_value(index);
1022 if (cur_enforcing < 0) {
1023 ret = cur_enforcing;
1026 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1027 bool_pending_values[index]);
1028 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1030 mutex_unlock(&sel_mutex);
1031 free_page((unsigned long)page);
1035 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1036 size_t count, loff_t *ppos)
1041 struct inode *inode = filep->f_path.dentry->d_inode;
1042 unsigned index = inode->i_ino & SEL_INO_MASK;
1043 const char *name = filep->f_path.dentry->d_name.name;
1045 mutex_lock(&sel_mutex);
1047 length = task_has_security(current, SECURITY__SETBOOL);
1052 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1056 if (count >= PAGE_SIZE)
1059 /* No partial writes. */
1065 page = (char *)get_zeroed_page(GFP_KERNEL);
1070 if (copy_from_user(page, buf, count))
1074 if (sscanf(page, "%d", &new_value) != 1)
1080 bool_pending_values[index] = new_value;
1084 mutex_unlock(&sel_mutex);
1085 free_page((unsigned long) page);
1089 static const struct file_operations sel_bool_ops = {
1090 .read = sel_read_bool,
1091 .write = sel_write_bool,
1092 .llseek = generic_file_llseek,
1095 static ssize_t sel_commit_bools_write(struct file *filep,
1096 const char __user *buf,
1097 size_t count, loff_t *ppos)
1103 mutex_lock(&sel_mutex);
1105 length = task_has_security(current, SECURITY__SETBOOL);
1110 if (count >= PAGE_SIZE)
1113 /* No partial writes. */
1119 page = (char *)get_zeroed_page(GFP_KERNEL);
1124 if (copy_from_user(page, buf, count))
1128 if (sscanf(page, "%d", &new_value) != 1)
1132 if (new_value && bool_pending_values)
1133 length = security_set_bools(bool_num, bool_pending_values);
1139 mutex_unlock(&sel_mutex);
1140 free_page((unsigned long) page);
1144 static const struct file_operations sel_commit_bools_ops = {
1145 .write = sel_commit_bools_write,
1146 .llseek = generic_file_llseek,
1149 static void sel_remove_entries(struct dentry *de)
1151 struct list_head *node;
1153 spin_lock(&dcache_lock);
1154 node = de->d_subdirs.next;
1155 while (node != &de->d_subdirs) {
1156 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1157 list_del_init(node);
1161 spin_unlock(&dcache_lock);
1163 simple_unlink(de->d_inode, d);
1165 spin_lock(&dcache_lock);
1167 node = de->d_subdirs.next;
1170 spin_unlock(&dcache_lock);
1173 #define BOOL_DIR_NAME "booleans"
1175 static int sel_make_bools(void)
1179 struct dentry *dentry = NULL;
1180 struct dentry *dir = bool_dir;
1181 struct inode *inode = NULL;
1182 struct inode_security_struct *isec;
1183 char **names = NULL, *page;
1188 /* remove any existing files */
1189 for (i = 0; i < bool_num; i++)
1190 kfree(bool_pending_names[i]);
1191 kfree(bool_pending_names);
1192 kfree(bool_pending_values);
1193 bool_pending_names = NULL;
1194 bool_pending_values = NULL;
1196 sel_remove_entries(dir);
1199 page = (char *)get_zeroed_page(GFP_KERNEL);
1203 ret = security_get_bools(&num, &names, &values);
1207 for (i = 0; i < num; i++) {
1209 dentry = d_alloc_name(dir, names[i]);
1214 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1219 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1223 ret = -ENAMETOOLONG;
1224 if (len >= PAGE_SIZE)
1227 isec = (struct inode_security_struct *)inode->i_security;
1228 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1233 isec->initialized = 1;
1234 inode->i_fop = &sel_bool_ops;
1235 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1236 d_add(dentry, inode);
1239 bool_pending_names = names;
1240 bool_pending_values = values;
1242 free_page((unsigned long)page);
1245 free_page((unsigned long)page);
1248 for (i = 0; i < num; i++)
1253 sel_remove_entries(dir);
1258 #define NULL_FILE_NAME "null"
1260 struct dentry *selinux_null;
1262 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1263 size_t count, loff_t *ppos)
1265 char tmpbuf[TMPBUFLEN];
1268 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1269 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1272 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1273 const char __user *buf,
1274 size_t count, loff_t *ppos)
1281 ret = task_has_security(current, SECURITY__SETSECPARAM);
1286 if (count >= PAGE_SIZE)
1289 /* No partial writes. */
1295 page = (char *)get_zeroed_page(GFP_KERNEL);
1300 if (copy_from_user(page, buf, count))
1304 if (sscanf(page, "%u", &new_value) != 1)
1307 avc_cache_threshold = new_value;
1311 free_page((unsigned long)page);
1315 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1316 size_t count, loff_t *ppos)
1321 page = (char *)__get_free_page(GFP_KERNEL);
1325 length = avc_get_hash_stats(page);
1327 length = simple_read_from_buffer(buf, count, ppos, page, length);
1328 free_page((unsigned long)page);
1333 static const struct file_operations sel_avc_cache_threshold_ops = {
1334 .read = sel_read_avc_cache_threshold,
1335 .write = sel_write_avc_cache_threshold,
1336 .llseek = generic_file_llseek,
1339 static const struct file_operations sel_avc_hash_stats_ops = {
1340 .read = sel_read_avc_hash_stats,
1341 .llseek = generic_file_llseek,
1344 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1345 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1349 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1350 if (!cpu_possible(cpu))
1353 return &per_cpu(avc_cache_stats, cpu);
1358 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1360 loff_t n = *pos - 1;
1363 return SEQ_START_TOKEN;
1365 return sel_avc_get_stat_idx(&n);
1368 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1370 return sel_avc_get_stat_idx(pos);
1373 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1375 struct avc_cache_stats *st = v;
1377 if (v == SEQ_START_TOKEN)
1378 seq_printf(seq, "lookups hits misses allocations reclaims "
1381 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1382 st->hits, st->misses, st->allocations,
1383 st->reclaims, st->frees);
1387 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1390 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1391 .start = sel_avc_stats_seq_start,
1392 .next = sel_avc_stats_seq_next,
1393 .show = sel_avc_stats_seq_show,
1394 .stop = sel_avc_stats_seq_stop,
1397 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1399 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1402 static const struct file_operations sel_avc_cache_stats_ops = {
1403 .open = sel_open_avc_cache_stats,
1405 .llseek = seq_lseek,
1406 .release = seq_release,
1410 static int sel_make_avc_files(struct dentry *dir)
1413 static struct tree_descr files[] = {
1414 { "cache_threshold",
1415 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1416 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1417 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1418 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1422 for (i = 0; i < ARRAY_SIZE(files); i++) {
1423 struct inode *inode;
1424 struct dentry *dentry;
1426 dentry = d_alloc_name(dir, files[i].name);
1430 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));
1477 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1481 inode->i_fop = &sel_initcon_ops;
1482 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1483 d_add(dentry, inode);
1489 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1491 return a / b - (a % b < 0);
1494 static inline unsigned long sel_class_to_ino(u16 class)
1496 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1499 static inline u16 sel_ino_to_class(unsigned long ino)
1501 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1504 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1506 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1509 static inline u32 sel_ino_to_perm(unsigned long ino)
1511 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1514 static ssize_t sel_read_class(struct file *file, char __user *buf,
1515 size_t count, loff_t *ppos)
1519 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1521 page = (char *)__get_free_page(GFP_KERNEL);
1525 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1526 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1527 free_page((unsigned long)page);
1532 static const struct file_operations sel_class_ops = {
1533 .read = sel_read_class,
1534 .llseek = generic_file_llseek,
1537 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1538 size_t count, loff_t *ppos)
1542 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1544 page = (char *)__get_free_page(GFP_KERNEL);
1548 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1549 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1550 free_page((unsigned long)page);
1555 static const struct file_operations sel_perm_ops = {
1556 .read = sel_read_perm,
1557 .llseek = generic_file_llseek,
1560 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1561 size_t count, loff_t *ppos)
1564 char tmpbuf[TMPBUFLEN];
1566 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1568 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1569 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1571 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1574 static const struct file_operations sel_policycap_ops = {
1575 .read = sel_read_policycap,
1576 .llseek = generic_file_llseek,
1579 static int sel_make_perm_files(char *objclass, int classvalue,
1585 rc = security_get_permissions(objclass, &perms, &nperms);
1589 for (i = 0; i < nperms; i++) {
1590 struct inode *inode;
1591 struct dentry *dentry;
1594 dentry = d_alloc_name(dir, perms[i]);
1599 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1603 inode->i_fop = &sel_perm_ops;
1604 /* i+1 since perm values are 1-indexed */
1605 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1606 d_add(dentry, inode);
1610 for (i = 0; i < nperms; i++)
1616 static int sel_make_class_dir_entries(char *classname, int index,
1619 struct dentry *dentry = NULL;
1620 struct inode *inode = NULL;
1623 dentry = d_alloc_name(dir, "index");
1627 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1631 inode->i_fop = &sel_class_ops;
1632 inode->i_ino = sel_class_to_ino(index);
1633 d_add(dentry, inode);
1635 dentry = d_alloc_name(dir, "perms");
1639 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1643 rc = sel_make_perm_files(classname, index, dentry);
1648 static void sel_remove_classes(void)
1650 struct list_head *class_node;
1652 list_for_each(class_node, &class_dir->d_subdirs) {
1653 struct dentry *class_subdir = list_entry(class_node,
1654 struct dentry, d_u.d_child);
1655 struct list_head *class_subdir_node;
1657 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1658 struct dentry *d = list_entry(class_subdir_node,
1659 struct dentry, d_u.d_child);
1662 if (d->d_inode->i_mode & S_IFDIR)
1663 sel_remove_entries(d);
1666 sel_remove_entries(class_subdir);
1669 sel_remove_entries(class_dir);
1672 static int sel_make_classes(void)
1674 int rc, nclasses, i;
1677 /* delete any existing entries */
1678 sel_remove_classes();
1680 rc = security_get_classes(&classes, &nclasses);
1684 /* +2 since classes are 1-indexed */
1685 last_class_ino = sel_class_to_ino(nclasses + 2);
1687 for (i = 0; i < nclasses; i++) {
1688 struct dentry *class_name_dir;
1691 class_name_dir = d_alloc_name(class_dir, classes[i]);
1692 if (!class_name_dir)
1695 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1700 /* i+1 since class values are 1-indexed */
1701 rc = sel_make_class_dir_entries(classes[i], i + 1,
1708 for (i = 0; i < nclasses; i++)
1714 static int sel_make_policycap(void)
1717 struct dentry *dentry = NULL;
1718 struct inode *inode = NULL;
1720 sel_remove_entries(policycap_dir);
1722 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1723 if (iter < ARRAY_SIZE(policycap_names))
1724 dentry = d_alloc_name(policycap_dir,
1725 policycap_names[iter]);
1727 dentry = d_alloc_name(policycap_dir, "unknown");
1732 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1736 inode->i_fop = &sel_policycap_ops;
1737 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1738 d_add(dentry, inode);
1744 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1747 struct inode *inode;
1749 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1753 inode->i_op = &simple_dir_inode_operations;
1754 inode->i_fop = &simple_dir_operations;
1755 inode->i_ino = ++(*ino);
1756 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1758 d_add(dentry, inode);
1759 /* bump link count on parent directory, too */
1765 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1768 struct dentry *dentry;
1769 struct inode *inode, *root_inode;
1770 struct inode_security_struct *isec;
1772 static struct tree_descr selinux_files[] = {
1773 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1774 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1775 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1776 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1777 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1778 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1779 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1780 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1781 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1782 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1783 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1784 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1785 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1786 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1787 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1788 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1789 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUSR},
1792 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1796 root_inode = sb->s_root->d_inode;
1799 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1803 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1810 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1815 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1819 inode->i_ino = ++sel_last_ino;
1820 isec = (struct inode_security_struct *)inode->i_security;
1821 isec->sid = SECINITSID_DEVNULL;
1822 isec->sclass = SECCLASS_CHR_FILE;
1823 isec->initialized = 1;
1825 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1826 d_add(dentry, inode);
1827 selinux_null = dentry;
1830 dentry = d_alloc_name(sb->s_root, "avc");
1834 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1838 ret = sel_make_avc_files(dentry);
1843 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1847 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1851 ret = sel_make_initcon_files(dentry);
1856 dentry = d_alloc_name(sb->s_root, "class");
1860 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1867 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1871 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1875 policycap_dir = dentry;
1879 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1884 static struct dentry *sel_mount(struct file_system_type *fs_type,
1885 int flags, const char *dev_name, void *data)
1887 return mount_single(fs_type, flags, data, sel_fill_super);
1890 static struct file_system_type sel_fs_type = {
1891 .name = "selinuxfs",
1893 .kill_sb = kill_litter_super,
1896 struct vfsmount *selinuxfs_mount;
1898 static int __init init_sel_fs(void)
1902 if (!selinux_enabled)
1904 err = register_filesystem(&sel_fs_type);
1908 selinuxfs_mount = kern_mount(&sel_fs_type);
1909 if (IS_ERR(selinuxfs_mount)) {
1910 printk(KERN_ERR "selinuxfs: could not mount!\n");
1911 err = PTR_ERR(selinuxfs_mount);
1912 selinuxfs_mount = NULL;
1918 __initcall(init_sel_fs);
1920 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1921 void exit_sel_fs(void)
1923 unregister_filesystem(&sel_fs_type);