1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 * Added conditional policy language extensions
5 * Updated: Hewlett-Packard <paul@paul-moore.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>
31 #include <linux/kobject.h>
32 #include <linux/ctype.h>
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
42 #include "conditional.h"
44 /* Policy capability filenames */
45 static char *policycap_names[] = {
46 "network_peer_controls",
49 "always_check_network"
52 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
54 static int __init checkreqprot_setup(char *str)
56 unsigned long checkreqprot;
57 if (!kstrtoul(str, 0, &checkreqprot))
58 selinux_checkreqprot = checkreqprot ? 1 : 0;
61 __setup("checkreqprot=", checkreqprot_setup);
63 static DEFINE_MUTEX(sel_mutex);
65 /* global data for booleans */
66 static struct dentry *bool_dir;
68 static char **bool_pending_names;
69 static int *bool_pending_values;
71 /* global data for classes */
72 static struct dentry *class_dir;
73 static unsigned long last_class_ino;
75 static char policy_opened;
77 /* global data for policy capabilities */
78 static struct dentry *policycap_dir;
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct *tsk,
84 const struct task_security_struct *tsec;
88 tsec = __task_cred(tsk)->security;
95 return avc_has_perm(sid, SECINITSID_SECURITY,
96 SECCLASS_SECURITY, perms, NULL);
101 SEL_LOAD, /* load policy */
102 SEL_ENFORCE, /* get or set enforcing status */
103 SEL_CONTEXT, /* validate context */
104 SEL_ACCESS, /* compute access decision */
105 SEL_CREATE, /* compute create labeling decision */
106 SEL_RELABEL, /* compute relabeling decision */
107 SEL_USER, /* compute reachable user contexts */
108 SEL_POLICYVERS, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS, /* commit new boolean values */
110 SEL_MLS, /* return if MLS policy is enabled */
111 SEL_DISABLE, /* disable SELinux until next reboot */
112 SEL_MEMBER, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
117 SEL_STATUS, /* export current status using mmap() */
118 SEL_POLICY, /* allow userspace to read the in kernel policy */
119 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
120 SEL_INO_NEXT, /* The next inode number to use */
123 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
125 #define SEL_INITCON_INO_OFFSET 0x01000000
126 #define SEL_BOOL_INO_OFFSET 0x02000000
127 #define SEL_CLASS_INO_OFFSET 0x04000000
128 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
129 #define SEL_INO_MASK 0x00ffffff
132 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
133 size_t count, loff_t *ppos)
135 char tmpbuf[TMPBUFLEN];
138 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
139 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
142 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
143 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
144 size_t count, loff_t *ppos)
151 if (count >= PAGE_SIZE)
154 /* No partial writes. */
158 page = memdup_user_nul(buf, count);
160 return PTR_ERR(page);
163 if (sscanf(page, "%d", &new_value) != 1)
166 if (new_value != selinux_enforcing) {
167 length = task_has_security(current, SECURITY__SETENFORCE);
170 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
171 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
172 new_value, selinux_enforcing,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 selinux_enforcing = new_value;
176 if (selinux_enforcing)
178 selnl_notify_setenforce(selinux_enforcing);
179 selinux_status_update_setenforce(selinux_enforcing);
187 #define sel_write_enforce NULL
190 static const struct file_operations sel_enforce_ops = {
191 .read = sel_read_enforce,
192 .write = sel_write_enforce,
193 .llseek = generic_file_llseek,
196 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
197 size_t count, loff_t *ppos)
199 char tmpbuf[TMPBUFLEN];
201 ino_t ino = file_inode(filp)->i_ino;
202 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
203 security_get_reject_unknown() : !security_get_allow_unknown();
205 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
206 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
209 static const struct file_operations sel_handle_unknown_ops = {
210 .read = sel_read_handle_unknown,
211 .llseek = generic_file_llseek,
214 static int sel_open_handle_status(struct inode *inode, struct file *filp)
216 struct page *status = selinux_kernel_status_page();
221 filp->private_data = status;
226 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
227 size_t count, loff_t *ppos)
229 struct page *status = filp->private_data;
233 return simple_read_from_buffer(buf, count, ppos,
234 page_address(status),
235 sizeof(struct selinux_kernel_status));
238 static int sel_mmap_handle_status(struct file *filp,
239 struct vm_area_struct *vma)
241 struct page *status = filp->private_data;
242 unsigned long size = vma->vm_end - vma->vm_start;
246 /* only allows one page from the head */
247 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
249 /* disallow writable mapping */
250 if (vma->vm_flags & VM_WRITE)
252 /* disallow mprotect() turns it into writable */
253 vma->vm_flags &= ~VM_MAYWRITE;
255 return remap_pfn_range(vma, vma->vm_start,
257 size, vma->vm_page_prot);
260 static const struct file_operations sel_handle_status_ops = {
261 .open = sel_open_handle_status,
262 .read = sel_read_handle_status,
263 .mmap = sel_mmap_handle_status,
264 .llseek = generic_file_llseek,
267 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
268 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
269 size_t count, loff_t *ppos)
276 if (count >= PAGE_SIZE)
279 /* No partial writes. */
283 page = memdup_user_nul(buf, count);
285 return PTR_ERR(page);
288 if (sscanf(page, "%d", &new_value) != 1)
292 length = selinux_disable();
295 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
296 "selinux=0 auid=%u ses=%u",
297 from_kuid(&init_user_ns, audit_get_loginuid(current)),
298 audit_get_sessionid(current));
307 #define sel_write_disable NULL
310 static const struct file_operations sel_disable_ops = {
311 .write = sel_write_disable,
312 .llseek = generic_file_llseek,
315 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
316 size_t count, loff_t *ppos)
318 char tmpbuf[TMPBUFLEN];
321 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
322 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
325 static const struct file_operations sel_policyvers_ops = {
326 .read = sel_read_policyvers,
327 .llseek = generic_file_llseek,
330 /* declaration for sel_write_load */
331 static int sel_make_bools(void);
332 static int sel_make_classes(void);
333 static int sel_make_policycap(void);
335 /* declaration for sel_make_class_dirs */
336 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
339 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
340 size_t count, loff_t *ppos)
342 char tmpbuf[TMPBUFLEN];
345 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
346 security_mls_enabled());
347 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
350 static const struct file_operations sel_mls_ops = {
351 .read = sel_read_mls,
352 .llseek = generic_file_llseek,
355 struct policy_load_memory {
360 static int sel_open_policy(struct inode *inode, struct file *filp)
362 struct policy_load_memory *plm = NULL;
365 BUG_ON(filp->private_data);
367 mutex_lock(&sel_mutex);
369 rc = task_has_security(current, SECURITY__READ_POLICY);
378 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
382 if (i_size_read(inode) != security_policydb_len()) {
384 i_size_write(inode, security_policydb_len());
388 rc = security_read_policy(&plm->data, &plm->len);
394 filp->private_data = plm;
396 mutex_unlock(&sel_mutex);
400 mutex_unlock(&sel_mutex);
408 static int sel_release_policy(struct inode *inode, struct file *filp)
410 struct policy_load_memory *plm = filp->private_data;
422 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
423 size_t count, loff_t *ppos)
425 struct policy_load_memory *plm = filp->private_data;
428 mutex_lock(&sel_mutex);
430 ret = task_has_security(current, SECURITY__READ_POLICY);
434 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
436 mutex_unlock(&sel_mutex);
440 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
441 struct vm_fault *vmf)
443 struct policy_load_memory *plm = vma->vm_file->private_data;
444 unsigned long offset;
447 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
448 return VM_FAULT_SIGBUS;
450 offset = vmf->pgoff << PAGE_SHIFT;
451 if (offset >= roundup(plm->len, PAGE_SIZE))
452 return VM_FAULT_SIGBUS;
454 page = vmalloc_to_page(plm->data + offset);
462 static const struct vm_operations_struct sel_mmap_policy_ops = {
463 .fault = sel_mmap_policy_fault,
464 .page_mkwrite = sel_mmap_policy_fault,
467 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
469 if (vma->vm_flags & VM_SHARED) {
470 /* do not allow mprotect to make mapping writable */
471 vma->vm_flags &= ~VM_MAYWRITE;
473 if (vma->vm_flags & VM_WRITE)
477 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
478 vma->vm_ops = &sel_mmap_policy_ops;
483 static const struct file_operations sel_policy_ops = {
484 .open = sel_open_policy,
485 .read = sel_read_policy,
486 .mmap = sel_mmap_policy,
487 .release = sel_release_policy,
488 .llseek = generic_file_llseek,
491 static ssize_t sel_write_load(struct file *file, const char __user *buf,
492 size_t count, loff_t *ppos)
498 mutex_lock(&sel_mutex);
500 length = task_has_security(current, SECURITY__LOAD_POLICY);
504 /* No partial writes. */
510 if (count > 64 * 1024 * 1024)
514 data = vmalloc(count);
519 if (copy_from_user(data, buf, count) != 0)
522 length = security_load_policy(data, count);
526 length = sel_make_bools();
530 length = sel_make_classes();
534 length = sel_make_policycap();
541 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
542 "policy loaded auid=%u ses=%u",
543 from_kuid(&init_user_ns, audit_get_loginuid(current)),
544 audit_get_sessionid(current));
546 mutex_unlock(&sel_mutex);
551 static const struct file_operations sel_load_ops = {
552 .write = sel_write_load,
553 .llseek = generic_file_llseek,
556 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
562 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
566 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
570 length = security_sid_to_context(sid, &canon, &len);
575 if (len > SIMPLE_TRANSACTION_LIMIT) {
576 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
577 "payload max\n", __func__, len);
581 memcpy(buf, canon, len);
588 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
589 size_t count, loff_t *ppos)
591 char tmpbuf[TMPBUFLEN];
594 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
595 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
598 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
599 size_t count, loff_t *ppos)
603 unsigned int new_value;
605 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
609 if (count >= PAGE_SIZE)
612 /* No partial writes. */
616 page = memdup_user_nul(buf, count);
618 return PTR_ERR(page);
621 if (sscanf(page, "%u", &new_value) != 1)
624 selinux_checkreqprot = new_value ? 1 : 0;
630 static const struct file_operations sel_checkreqprot_ops = {
631 .read = sel_read_checkreqprot,
632 .write = sel_write_checkreqprot,
633 .llseek = generic_file_llseek,
636 static ssize_t sel_write_validatetrans(struct file *file,
637 const char __user *buf,
638 size_t count, loff_t *ppos)
640 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
642 u32 osid, nsid, tsid;
646 rc = task_has_security(current, SECURITY__VALIDATE_TRANS);
651 if (count >= PAGE_SIZE)
654 /* No partial writes. */
660 req = kzalloc(count + 1, GFP_KERNEL);
665 if (copy_from_user(req, buf, count))
669 oldcon = kzalloc(count + 1, GFP_KERNEL);
673 newcon = kzalloc(count + 1, GFP_KERNEL);
677 taskcon = kzalloc(count + 1, GFP_KERNEL);
682 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
685 rc = security_context_str_to_sid(oldcon, &osid, GFP_KERNEL);
689 rc = security_context_str_to_sid(newcon, &nsid, GFP_KERNEL);
693 rc = security_context_str_to_sid(taskcon, &tsid, GFP_KERNEL);
697 rc = security_validate_transition_user(osid, nsid, tsid, tclass);
708 static const struct file_operations sel_transition_ops = {
709 .write = sel_write_validatetrans,
710 .llseek = generic_file_llseek,
714 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
716 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
717 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
718 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
719 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
720 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
722 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
723 [SEL_ACCESS] = sel_write_access,
724 [SEL_CREATE] = sel_write_create,
725 [SEL_RELABEL] = sel_write_relabel,
726 [SEL_USER] = sel_write_user,
727 [SEL_MEMBER] = sel_write_member,
728 [SEL_CONTEXT] = sel_write_context,
731 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
733 ino_t ino = file_inode(file)->i_ino;
737 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
740 data = simple_transaction_get(file, buf, size);
742 return PTR_ERR(data);
744 rv = write_op[ino](file, data, size);
746 simple_transaction_set(file, rv);
752 static const struct file_operations transaction_ops = {
753 .write = selinux_transaction_write,
754 .read = simple_transaction_read,
755 .release = simple_transaction_release,
756 .llseek = generic_file_llseek,
760 * payload - write methods
761 * If the method has a response, the response should be put in buf,
762 * and the length returned. Otherwise return 0 or and -error.
765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
767 char *scon = NULL, *tcon = NULL;
770 struct av_decision avd;
773 length = task_has_security(current, SECURITY__COMPUTE_AV);
778 scon = kzalloc(size + 1, GFP_KERNEL);
783 tcon = kzalloc(size + 1, GFP_KERNEL);
788 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
791 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
795 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
799 security_compute_av_user(ssid, tsid, tclass, &avd);
801 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
803 avd.allowed, 0xffffffff,
804 avd.auditallow, avd.auditdeny,
805 avd.seqno, avd.flags);
812 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
814 char *scon = NULL, *tcon = NULL;
815 char *namebuf = NULL, *objname = NULL;
816 u32 ssid, tsid, newsid;
823 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
828 scon = kzalloc(size + 1, GFP_KERNEL);
833 tcon = kzalloc(size + 1, GFP_KERNEL);
838 namebuf = kzalloc(size + 1, GFP_KERNEL);
843 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
844 if (nargs < 3 || nargs > 4)
848 * If and when the name of new object to be queried contains
849 * either whitespace or multibyte characters, they shall be
850 * encoded based on the percentage-encoding rule.
851 * If not encoded, the sscanf logic picks up only left-half
852 * of the supplied name; splitted by a whitespace unexpectedly.
862 else if (c1 == '%') {
863 c1 = hex_to_bin(*r++);
866 c2 = hex_to_bin(*r++);
872 } while (c1 != '\0');
877 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
881 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
885 length = security_transition_sid_user(ssid, tsid, tclass,
890 length = security_sid_to_context(newsid, &newcon, &len);
895 if (len > SIMPLE_TRANSACTION_LIMIT) {
896 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
897 "payload max\n", __func__, len);
901 memcpy(buf, newcon, len);
911 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
913 char *scon = NULL, *tcon = NULL;
914 u32 ssid, tsid, newsid;
920 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
925 scon = kzalloc(size + 1, GFP_KERNEL);
930 tcon = kzalloc(size + 1, GFP_KERNEL);
935 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
938 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
942 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
946 length = security_change_sid(ssid, tsid, tclass, &newsid);
950 length = security_sid_to_context(newsid, &newcon, &len);
955 if (len > SIMPLE_TRANSACTION_LIMIT)
958 memcpy(buf, newcon, len);
967 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
969 char *con = NULL, *user = NULL, *ptr;
970 u32 sid, *sids = NULL;
976 length = task_has_security(current, SECURITY__COMPUTE_USER);
981 con = kzalloc(size + 1, GFP_KERNEL);
986 user = kzalloc(size + 1, GFP_KERNEL);
991 if (sscanf(buf, "%s %s", con, user) != 2)
994 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
998 length = security_get_user_sids(sid, user, &sids, &nsids);
1002 length = sprintf(buf, "%u", nsids) + 1;
1004 for (i = 0; i < nsids; i++) {
1005 rc = security_sid_to_context(sids[i], &newcon, &len);
1010 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1015 memcpy(ptr, newcon, len);
1027 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1029 char *scon = NULL, *tcon = NULL;
1030 u32 ssid, tsid, newsid;
1033 char *newcon = NULL;
1036 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
1041 scon = kzalloc(size + 1, GFP_KERNEL);
1046 tcon = kzalloc(size + 1, GFP_KERNEL);
1051 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1054 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1058 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1062 length = security_member_sid(ssid, tsid, tclass, &newsid);
1066 length = security_sid_to_context(newsid, &newcon, &len);
1071 if (len > SIMPLE_TRANSACTION_LIMIT) {
1072 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1073 "payload max\n", __func__, len);
1077 memcpy(buf, newcon, len);
1086 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1088 struct inode *ret = new_inode(sb);
1092 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1097 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1098 size_t count, loff_t *ppos)
1104 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1105 const char *name = filep->f_path.dentry->d_name.name;
1107 mutex_lock(&sel_mutex);
1110 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1114 page = (char *)get_zeroed_page(GFP_KERNEL);
1118 cur_enforcing = security_get_bool_value(index);
1119 if (cur_enforcing < 0) {
1120 ret = cur_enforcing;
1123 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1124 bool_pending_values[index]);
1125 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1127 mutex_unlock(&sel_mutex);
1128 free_page((unsigned long)page);
1132 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1133 size_t count, loff_t *ppos)
1138 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1139 const char *name = filep->f_path.dentry->d_name.name;
1141 mutex_lock(&sel_mutex);
1143 length = task_has_security(current, SECURITY__SETBOOL);
1148 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1152 if (count >= PAGE_SIZE)
1155 /* No partial writes. */
1160 page = memdup_user_nul(buf, count);
1162 length = PTR_ERR(page);
1168 if (sscanf(page, "%d", &new_value) != 1)
1174 bool_pending_values[index] = new_value;
1178 mutex_unlock(&sel_mutex);
1183 static const struct file_operations sel_bool_ops = {
1184 .read = sel_read_bool,
1185 .write = sel_write_bool,
1186 .llseek = generic_file_llseek,
1189 static ssize_t sel_commit_bools_write(struct file *filep,
1190 const char __user *buf,
1191 size_t count, loff_t *ppos)
1197 mutex_lock(&sel_mutex);
1199 length = task_has_security(current, SECURITY__SETBOOL);
1204 if (count >= PAGE_SIZE)
1207 /* No partial writes. */
1212 page = memdup_user_nul(buf, count);
1214 length = PTR_ERR(page);
1220 if (sscanf(page, "%d", &new_value) != 1)
1224 if (new_value && bool_pending_values)
1225 length = security_set_bools(bool_num, bool_pending_values);
1231 mutex_unlock(&sel_mutex);
1236 static const struct file_operations sel_commit_bools_ops = {
1237 .write = sel_commit_bools_write,
1238 .llseek = generic_file_llseek,
1241 static void sel_remove_entries(struct dentry *de)
1244 shrink_dcache_parent(de);
1247 #define BOOL_DIR_NAME "booleans"
1249 static int sel_make_bools(void)
1253 struct dentry *dentry = NULL;
1254 struct dentry *dir = bool_dir;
1255 struct inode *inode = NULL;
1256 struct inode_security_struct *isec;
1257 char **names = NULL, *page;
1262 /* remove any existing files */
1263 for (i = 0; i < bool_num; i++)
1264 kfree(bool_pending_names[i]);
1265 kfree(bool_pending_names);
1266 kfree(bool_pending_values);
1268 bool_pending_names = NULL;
1269 bool_pending_values = NULL;
1271 sel_remove_entries(dir);
1274 page = (char *)get_zeroed_page(GFP_KERNEL);
1278 ret = security_get_bools(&num, &names, &values);
1282 for (i = 0; i < num; i++) {
1284 dentry = d_alloc_name(dir, names[i]);
1289 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1293 ret = -ENAMETOOLONG;
1294 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1295 if (len >= PAGE_SIZE)
1298 isec = (struct inode_security_struct *)inode->i_security;
1299 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1304 isec->initialized = 1;
1305 inode->i_fop = &sel_bool_ops;
1306 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1307 d_add(dentry, inode);
1310 bool_pending_names = names;
1311 bool_pending_values = values;
1313 free_page((unsigned long)page);
1316 free_page((unsigned long)page);
1319 for (i = 0; i < num; i++)
1324 sel_remove_entries(dir);
1329 #define NULL_FILE_NAME "null"
1331 struct path selinux_null;
1333 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1334 size_t count, loff_t *ppos)
1336 char tmpbuf[TMPBUFLEN];
1339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1343 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1344 const char __user *buf,
1345 size_t count, loff_t *ppos)
1350 unsigned int new_value;
1352 ret = task_has_security(current, SECURITY__SETSECPARAM);
1356 if (count >= PAGE_SIZE)
1359 /* No partial writes. */
1363 page = memdup_user_nul(buf, count);
1365 return PTR_ERR(page);
1368 if (sscanf(page, "%u", &new_value) != 1)
1371 avc_cache_threshold = new_value;
1379 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1380 size_t count, loff_t *ppos)
1385 page = (char *)__get_free_page(GFP_KERNEL);
1389 length = avc_get_hash_stats(page);
1391 length = simple_read_from_buffer(buf, count, ppos, page, length);
1392 free_page((unsigned long)page);
1397 static const struct file_operations sel_avc_cache_threshold_ops = {
1398 .read = sel_read_avc_cache_threshold,
1399 .write = sel_write_avc_cache_threshold,
1400 .llseek = generic_file_llseek,
1403 static const struct file_operations sel_avc_hash_stats_ops = {
1404 .read = sel_read_avc_hash_stats,
1405 .llseek = generic_file_llseek,
1408 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1409 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1413 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1414 if (!cpu_possible(cpu))
1417 return &per_cpu(avc_cache_stats, cpu);
1422 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1424 loff_t n = *pos - 1;
1427 return SEQ_START_TOKEN;
1429 return sel_avc_get_stat_idx(&n);
1432 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1434 return sel_avc_get_stat_idx(pos);
1437 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1439 struct avc_cache_stats *st = v;
1441 if (v == SEQ_START_TOKEN)
1442 seq_printf(seq, "lookups hits misses allocations reclaims "
1445 unsigned int lookups = st->lookups;
1446 unsigned int misses = st->misses;
1447 unsigned int hits = lookups - misses;
1448 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1449 hits, misses, st->allocations,
1450 st->reclaims, st->frees);
1455 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1458 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1459 .start = sel_avc_stats_seq_start,
1460 .next = sel_avc_stats_seq_next,
1461 .show = sel_avc_stats_seq_show,
1462 .stop = sel_avc_stats_seq_stop,
1465 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1467 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1470 static const struct file_operations sel_avc_cache_stats_ops = {
1471 .open = sel_open_avc_cache_stats,
1473 .llseek = seq_lseek,
1474 .release = seq_release,
1478 static int sel_make_avc_files(struct dentry *dir)
1481 static struct tree_descr files[] = {
1482 { "cache_threshold",
1483 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1484 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1485 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1486 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1490 for (i = 0; i < ARRAY_SIZE(files); i++) {
1491 struct inode *inode;
1492 struct dentry *dentry;
1494 dentry = d_alloc_name(dir, files[i].name);
1498 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1502 inode->i_fop = files[i].ops;
1503 inode->i_ino = ++sel_last_ino;
1504 d_add(dentry, inode);
1510 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1511 size_t count, loff_t *ppos)
1517 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1518 ret = security_sid_to_context(sid, &con, &len);
1522 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1527 static const struct file_operations sel_initcon_ops = {
1528 .read = sel_read_initcon,
1529 .llseek = generic_file_llseek,
1532 static int sel_make_initcon_files(struct dentry *dir)
1536 for (i = 1; i <= SECINITSID_NUM; i++) {
1537 struct inode *inode;
1538 struct dentry *dentry;
1539 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1543 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1547 inode->i_fop = &sel_initcon_ops;
1548 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1549 d_add(dentry, inode);
1555 static inline unsigned long sel_class_to_ino(u16 class)
1557 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1560 static inline u16 sel_ino_to_class(unsigned long ino)
1562 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1565 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1567 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1570 static inline u32 sel_ino_to_perm(unsigned long ino)
1572 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1575 static ssize_t sel_read_class(struct file *file, char __user *buf,
1576 size_t count, loff_t *ppos)
1578 unsigned long ino = file_inode(file)->i_ino;
1579 char res[TMPBUFLEN];
1580 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1581 return simple_read_from_buffer(buf, count, ppos, res, len);
1584 static const struct file_operations sel_class_ops = {
1585 .read = sel_read_class,
1586 .llseek = generic_file_llseek,
1589 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1590 size_t count, loff_t *ppos)
1592 unsigned long ino = file_inode(file)->i_ino;
1593 char res[TMPBUFLEN];
1594 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1595 return simple_read_from_buffer(buf, count, ppos, res, len);
1598 static const struct file_operations sel_perm_ops = {
1599 .read = sel_read_perm,
1600 .llseek = generic_file_llseek,
1603 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1604 size_t count, loff_t *ppos)
1607 char tmpbuf[TMPBUFLEN];
1609 unsigned long i_ino = file_inode(file)->i_ino;
1611 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1612 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1614 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1617 static const struct file_operations sel_policycap_ops = {
1618 .read = sel_read_policycap,
1619 .llseek = generic_file_llseek,
1622 static int sel_make_perm_files(char *objclass, int classvalue,
1628 rc = security_get_permissions(objclass, &perms, &nperms);
1632 for (i = 0; i < nperms; i++) {
1633 struct inode *inode;
1634 struct dentry *dentry;
1637 dentry = d_alloc_name(dir, perms[i]);
1642 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1646 inode->i_fop = &sel_perm_ops;
1647 /* i+1 since perm values are 1-indexed */
1648 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1649 d_add(dentry, inode);
1653 for (i = 0; i < nperms; i++)
1659 static int sel_make_class_dir_entries(char *classname, int index,
1662 struct dentry *dentry = NULL;
1663 struct inode *inode = NULL;
1666 dentry = d_alloc_name(dir, "index");
1670 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1674 inode->i_fop = &sel_class_ops;
1675 inode->i_ino = sel_class_to_ino(index);
1676 d_add(dentry, inode);
1678 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1680 return PTR_ERR(dentry);
1682 rc = sel_make_perm_files(classname, index, dentry);
1687 static int sel_make_classes(void)
1689 int rc, nclasses, i;
1692 /* delete any existing entries */
1693 sel_remove_entries(class_dir);
1695 rc = security_get_classes(&classes, &nclasses);
1699 /* +2 since classes are 1-indexed */
1700 last_class_ino = sel_class_to_ino(nclasses + 2);
1702 for (i = 0; i < nclasses; i++) {
1703 struct dentry *class_name_dir;
1705 class_name_dir = sel_make_dir(class_dir, classes[i],
1707 if (IS_ERR(class_name_dir)) {
1708 rc = PTR_ERR(class_name_dir);
1712 /* i+1 since class values are 1-indexed */
1713 rc = sel_make_class_dir_entries(classes[i], i + 1,
1720 for (i = 0; i < nclasses; i++)
1726 static int sel_make_policycap(void)
1729 struct dentry *dentry = NULL;
1730 struct inode *inode = NULL;
1732 sel_remove_entries(policycap_dir);
1734 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1735 if (iter < ARRAY_SIZE(policycap_names))
1736 dentry = d_alloc_name(policycap_dir,
1737 policycap_names[iter]);
1739 dentry = d_alloc_name(policycap_dir, "unknown");
1744 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1748 inode->i_fop = &sel_policycap_ops;
1749 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1750 d_add(dentry, inode);
1756 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1759 struct dentry *dentry = d_alloc_name(dir, name);
1760 struct inode *inode;
1763 return ERR_PTR(-ENOMEM);
1765 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1768 return ERR_PTR(-ENOMEM);
1771 inode->i_op = &simple_dir_inode_operations;
1772 inode->i_fop = &simple_dir_operations;
1773 inode->i_ino = ++(*ino);
1774 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1776 d_add(dentry, inode);
1777 /* bump link count on parent directory, too */
1778 inc_nlink(d_inode(dir));
1783 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1786 struct dentry *dentry;
1787 struct inode *inode;
1788 struct inode_security_struct *isec;
1790 static struct tree_descr selinux_files[] = {
1791 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1792 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1793 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1794 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1795 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1796 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1797 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1798 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1799 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1800 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1801 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1802 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1803 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1804 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1805 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1806 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1807 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1808 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1812 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1816 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1817 if (IS_ERR(bool_dir)) {
1818 ret = PTR_ERR(bool_dir);
1824 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1829 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1833 inode->i_ino = ++sel_last_ino;
1834 isec = (struct inode_security_struct *)inode->i_security;
1835 isec->sid = SECINITSID_DEVNULL;
1836 isec->sclass = SECCLASS_CHR_FILE;
1837 isec->initialized = 1;
1839 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1840 d_add(dentry, inode);
1841 selinux_null.dentry = dentry;
1843 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1844 if (IS_ERR(dentry)) {
1845 ret = PTR_ERR(dentry);
1849 ret = sel_make_avc_files(dentry);
1853 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1854 if (IS_ERR(dentry)) {
1855 ret = PTR_ERR(dentry);
1859 ret = sel_make_initcon_files(dentry);
1863 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1864 if (IS_ERR(class_dir)) {
1865 ret = PTR_ERR(class_dir);
1870 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1871 if (IS_ERR(policycap_dir)) {
1872 ret = PTR_ERR(policycap_dir);
1873 policycap_dir = NULL;
1878 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1883 static struct dentry *sel_mount(struct file_system_type *fs_type,
1884 int flags, const char *dev_name, void *data)
1886 return mount_single(fs_type, flags, data, sel_fill_super);
1889 static struct file_system_type sel_fs_type = {
1890 .name = "selinuxfs",
1892 .kill_sb = kill_litter_super,
1895 struct vfsmount *selinuxfs_mount;
1897 static int __init init_sel_fs(void)
1901 if (!selinux_enabled)
1904 err = sysfs_create_mount_point(fs_kobj, "selinux");
1908 err = register_filesystem(&sel_fs_type);
1910 sysfs_remove_mount_point(fs_kobj, "selinux");
1914 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1915 if (IS_ERR(selinuxfs_mount)) {
1916 printk(KERN_ERR "selinuxfs: could not mount!\n");
1917 err = PTR_ERR(selinuxfs_mount);
1918 selinuxfs_mount = NULL;
1924 __initcall(init_sel_fs);
1926 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1927 void exit_sel_fs(void)
1929 sysfs_remove_mount_point(fs_kobj, "selinux");
1930 kern_unmount(selinuxfs_mount);
1931 unregister_filesystem(&sel_fs_type);