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_INO_NEXT, /* The next inode number to use */
122 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
124 #define SEL_INITCON_INO_OFFSET 0x01000000
125 #define SEL_BOOL_INO_OFFSET 0x02000000
126 #define SEL_CLASS_INO_OFFSET 0x04000000
127 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
128 #define SEL_INO_MASK 0x00ffffff
131 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
132 size_t count, loff_t *ppos)
134 char tmpbuf[TMPBUFLEN];
137 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
138 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
141 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
142 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
143 size_t count, loff_t *ppos)
151 if (count >= PAGE_SIZE)
154 /* No partial writes. */
160 page = (char *)get_zeroed_page(GFP_KERNEL);
165 if (copy_from_user(page, buf, count))
169 if (sscanf(page, "%d", &new_value) != 1)
172 if (new_value != selinux_enforcing) {
173 length = task_has_security(current, SECURITY__SETENFORCE);
176 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
177 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
178 new_value, selinux_enforcing,
179 from_kuid(&init_user_ns, audit_get_loginuid(current)),
180 audit_get_sessionid(current));
181 selinux_enforcing = new_value;
182 if (selinux_enforcing)
184 selnl_notify_setenforce(selinux_enforcing);
185 selinux_status_update_setenforce(selinux_enforcing);
189 free_page((unsigned long) page);
193 #define sel_write_enforce NULL
196 static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 .llseek = generic_file_llseek,
202 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
205 char tmpbuf[TMPBUFLEN];
207 ino_t ino = file_inode(filp)->i_ino;
208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 .llseek = generic_file_llseek,
220 static int sel_open_handle_status(struct inode *inode, struct file *filp)
222 struct page *status = selinux_kernel_status_page();
227 filp->private_data = status;
232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
235 struct page *status = filp->private_data;
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
244 static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
261 return remap_pfn_range(vma, vma->vm_start,
263 size, vma->vm_page_prot);
266 static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
283 if (count >= PAGE_SIZE)
286 /* No partial writes. */
292 page = (char *)get_zeroed_page(GFP_KERNEL);
297 if (copy_from_user(page, buf, count))
301 if (sscanf(page, "%d", &new_value) != 1)
305 length = selinux_disable();
308 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
309 "selinux=0 auid=%u ses=%u",
310 from_kuid(&init_user_ns, audit_get_loginuid(current)),
311 audit_get_sessionid(current));
316 free_page((unsigned long) page);
320 #define sel_write_disable NULL
323 static const struct file_operations sel_disable_ops = {
324 .write = sel_write_disable,
325 .llseek = generic_file_llseek,
328 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
329 size_t count, loff_t *ppos)
331 char tmpbuf[TMPBUFLEN];
334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
335 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
338 static const struct file_operations sel_policyvers_ops = {
339 .read = sel_read_policyvers,
340 .llseek = generic_file_llseek,
343 /* declaration for sel_write_load */
344 static int sel_make_bools(void);
345 static int sel_make_classes(void);
346 static int sel_make_policycap(void);
348 /* declaration for sel_make_class_dirs */
349 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
352 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
353 size_t count, loff_t *ppos)
355 char tmpbuf[TMPBUFLEN];
358 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
359 security_mls_enabled());
360 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
363 static const struct file_operations sel_mls_ops = {
364 .read = sel_read_mls,
365 .llseek = generic_file_llseek,
368 struct policy_load_memory {
373 static int sel_open_policy(struct inode *inode, struct file *filp)
375 struct policy_load_memory *plm = NULL;
378 BUG_ON(filp->private_data);
380 mutex_lock(&sel_mutex);
382 rc = task_has_security(current, SECURITY__READ_POLICY);
391 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
395 if (i_size_read(inode) != security_policydb_len()) {
396 mutex_lock(&inode->i_mutex);
397 i_size_write(inode, security_policydb_len());
398 mutex_unlock(&inode->i_mutex);
401 rc = security_read_policy(&plm->data, &plm->len);
407 filp->private_data = plm;
409 mutex_unlock(&sel_mutex);
413 mutex_unlock(&sel_mutex);
421 static int sel_release_policy(struct inode *inode, struct file *filp)
423 struct policy_load_memory *plm = filp->private_data;
435 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
436 size_t count, loff_t *ppos)
438 struct policy_load_memory *plm = filp->private_data;
441 mutex_lock(&sel_mutex);
443 ret = task_has_security(current, SECURITY__READ_POLICY);
447 ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
449 mutex_unlock(&sel_mutex);
453 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
454 struct vm_fault *vmf)
456 struct policy_load_memory *plm = vma->vm_file->private_data;
457 unsigned long offset;
460 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
461 return VM_FAULT_SIGBUS;
463 offset = vmf->pgoff << PAGE_SHIFT;
464 if (offset >= roundup(plm->len, PAGE_SIZE))
465 return VM_FAULT_SIGBUS;
467 page = vmalloc_to_page(plm->data + offset);
475 static const struct vm_operations_struct sel_mmap_policy_ops = {
476 .fault = sel_mmap_policy_fault,
477 .page_mkwrite = sel_mmap_policy_fault,
480 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
482 if (vma->vm_flags & VM_SHARED) {
483 /* do not allow mprotect to make mapping writable */
484 vma->vm_flags &= ~VM_MAYWRITE;
486 if (vma->vm_flags & VM_WRITE)
490 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
491 vma->vm_ops = &sel_mmap_policy_ops;
496 static const struct file_operations sel_policy_ops = {
497 .open = sel_open_policy,
498 .read = sel_read_policy,
499 .mmap = sel_mmap_policy,
500 .release = sel_release_policy,
501 .llseek = generic_file_llseek,
504 static ssize_t sel_write_load(struct file *file, const char __user *buf,
505 size_t count, loff_t *ppos)
511 mutex_lock(&sel_mutex);
513 length = task_has_security(current, SECURITY__LOAD_POLICY);
517 /* No partial writes. */
523 if (count > 64 * 1024 * 1024)
527 data = vmalloc(count);
532 if (copy_from_user(data, buf, count) != 0)
535 length = security_load_policy(data, count);
539 length = sel_make_bools();
543 length = sel_make_classes();
547 length = sel_make_policycap();
554 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
555 "policy loaded auid=%u ses=%u",
556 from_kuid(&init_user_ns, audit_get_loginuid(current)),
557 audit_get_sessionid(current));
559 mutex_unlock(&sel_mutex);
564 static const struct file_operations sel_load_ops = {
565 .write = sel_write_load,
566 .llseek = generic_file_llseek,
569 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
575 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
579 length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
583 length = security_sid_to_context(sid, &canon, &len);
588 if (len > SIMPLE_TRANSACTION_LIMIT) {
589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
594 memcpy(buf, canon, len);
601 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
602 size_t count, loff_t *ppos)
604 char tmpbuf[TMPBUFLEN];
607 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
608 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
611 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
612 size_t count, loff_t *ppos)
616 unsigned int new_value;
618 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
623 if (count >= PAGE_SIZE)
626 /* No partial writes. */
632 page = (char *)get_zeroed_page(GFP_KERNEL);
637 if (copy_from_user(page, buf, count))
641 if (sscanf(page, "%u", &new_value) != 1)
644 selinux_checkreqprot = new_value ? 1 : 0;
647 free_page((unsigned long) page);
650 static const struct file_operations sel_checkreqprot_ops = {
651 .read = sel_read_checkreqprot,
652 .write = sel_write_checkreqprot,
653 .llseek = generic_file_llseek,
657 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
659 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
660 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
661 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
662 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
663 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
665 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
666 [SEL_ACCESS] = sel_write_access,
667 [SEL_CREATE] = sel_write_create,
668 [SEL_RELABEL] = sel_write_relabel,
669 [SEL_USER] = sel_write_user,
670 [SEL_MEMBER] = sel_write_member,
671 [SEL_CONTEXT] = sel_write_context,
674 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
676 ino_t ino = file_inode(file)->i_ino;
680 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
683 data = simple_transaction_get(file, buf, size);
685 return PTR_ERR(data);
687 rv = write_op[ino](file, data, size);
689 simple_transaction_set(file, rv);
695 static const struct file_operations transaction_ops = {
696 .write = selinux_transaction_write,
697 .read = simple_transaction_read,
698 .release = simple_transaction_release,
699 .llseek = generic_file_llseek,
703 * payload - write methods
704 * If the method has a response, the response should be put in buf,
705 * and the length returned. Otherwise return 0 or and -error.
708 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
710 char *scon = NULL, *tcon = NULL;
713 struct av_decision avd;
716 length = task_has_security(current, SECURITY__COMPUTE_AV);
721 scon = kzalloc(size + 1, GFP_KERNEL);
726 tcon = kzalloc(size + 1, GFP_KERNEL);
731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
734 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
738 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
742 security_compute_av_user(ssid, tsid, tclass, &avd);
744 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
746 avd.allowed, 0xffffffff,
747 avd.auditallow, avd.auditdeny,
748 avd.seqno, avd.flags);
755 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
757 char *scon = NULL, *tcon = NULL;
758 char *namebuf = NULL, *objname = NULL;
759 u32 ssid, tsid, newsid;
766 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
771 scon = kzalloc(size + 1, GFP_KERNEL);
776 tcon = kzalloc(size + 1, GFP_KERNEL);
781 namebuf = kzalloc(size + 1, GFP_KERNEL);
786 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
787 if (nargs < 3 || nargs > 4)
791 * If and when the name of new object to be queried contains
792 * either whitespace or multibyte characters, they shall be
793 * encoded based on the percentage-encoding rule.
794 * If not encoded, the sscanf logic picks up only left-half
795 * of the supplied name; splitted by a whitespace unexpectedly.
805 else if (c1 == '%') {
806 c1 = hex_to_bin(*r++);
809 c2 = hex_to_bin(*r++);
815 } while (c1 != '\0');
820 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
824 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
828 length = security_transition_sid_user(ssid, tsid, tclass,
833 length = security_sid_to_context(newsid, &newcon, &len);
838 if (len > SIMPLE_TRANSACTION_LIMIT) {
839 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
840 "payload max\n", __func__, len);
844 memcpy(buf, newcon, len);
854 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
856 char *scon = NULL, *tcon = NULL;
857 u32 ssid, tsid, newsid;
863 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
868 scon = kzalloc(size + 1, GFP_KERNEL);
873 tcon = kzalloc(size + 1, GFP_KERNEL);
878 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
881 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
885 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
889 length = security_change_sid(ssid, tsid, tclass, &newsid);
893 length = security_sid_to_context(newsid, &newcon, &len);
898 if (len > SIMPLE_TRANSACTION_LIMIT)
901 memcpy(buf, newcon, len);
910 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
912 char *con = NULL, *user = NULL, *ptr;
913 u32 sid, *sids = NULL;
919 length = task_has_security(current, SECURITY__COMPUTE_USER);
924 con = kzalloc(size + 1, GFP_KERNEL);
929 user = kzalloc(size + 1, GFP_KERNEL);
934 if (sscanf(buf, "%s %s", con, user) != 2)
937 length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
941 length = security_get_user_sids(sid, user, &sids, &nsids);
945 length = sprintf(buf, "%u", nsids) + 1;
947 for (i = 0; i < nsids; i++) {
948 rc = security_sid_to_context(sids[i], &newcon, &len);
953 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
958 memcpy(ptr, newcon, len);
970 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
972 char *scon = NULL, *tcon = NULL;
973 u32 ssid, tsid, newsid;
979 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
984 scon = kzalloc(size + 1, GFP_KERNEL);
989 tcon = kzalloc(size + 1, GFP_KERNEL);
994 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
997 length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
1001 length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
1005 length = security_member_sid(ssid, tsid, tclass, &newsid);
1009 length = security_sid_to_context(newsid, &newcon, &len);
1014 if (len > SIMPLE_TRANSACTION_LIMIT) {
1015 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
1016 "payload max\n", __func__, len);
1020 memcpy(buf, newcon, len);
1029 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1031 struct inode *ret = new_inode(sb);
1035 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1040 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1041 size_t count, loff_t *ppos)
1047 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1048 const char *name = filep->f_path.dentry->d_name.name;
1050 mutex_lock(&sel_mutex);
1053 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1057 page = (char *)get_zeroed_page(GFP_KERNEL);
1061 cur_enforcing = security_get_bool_value(index);
1062 if (cur_enforcing < 0) {
1063 ret = cur_enforcing;
1066 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1067 bool_pending_values[index]);
1068 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1070 mutex_unlock(&sel_mutex);
1071 free_page((unsigned long)page);
1075 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1076 size_t count, loff_t *ppos)
1081 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1082 const char *name = filep->f_path.dentry->d_name.name;
1084 mutex_lock(&sel_mutex);
1086 length = task_has_security(current, SECURITY__SETBOOL);
1091 if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1095 if (count >= PAGE_SIZE)
1098 /* No partial writes. */
1104 page = (char *)get_zeroed_page(GFP_KERNEL);
1109 if (copy_from_user(page, buf, count))
1113 if (sscanf(page, "%d", &new_value) != 1)
1119 bool_pending_values[index] = new_value;
1123 mutex_unlock(&sel_mutex);
1124 free_page((unsigned long) page);
1128 static const struct file_operations sel_bool_ops = {
1129 .read = sel_read_bool,
1130 .write = sel_write_bool,
1131 .llseek = generic_file_llseek,
1134 static ssize_t sel_commit_bools_write(struct file *filep,
1135 const char __user *buf,
1136 size_t count, loff_t *ppos)
1142 mutex_lock(&sel_mutex);
1144 length = task_has_security(current, SECURITY__SETBOOL);
1149 if (count >= PAGE_SIZE)
1152 /* No partial writes. */
1158 page = (char *)get_zeroed_page(GFP_KERNEL);
1163 if (copy_from_user(page, buf, count))
1167 if (sscanf(page, "%d", &new_value) != 1)
1171 if (new_value && bool_pending_values)
1172 length = security_set_bools(bool_num, bool_pending_values);
1178 mutex_unlock(&sel_mutex);
1179 free_page((unsigned long) page);
1183 static const struct file_operations sel_commit_bools_ops = {
1184 .write = sel_commit_bools_write,
1185 .llseek = generic_file_llseek,
1188 static void sel_remove_entries(struct dentry *de)
1191 shrink_dcache_parent(de);
1194 #define BOOL_DIR_NAME "booleans"
1196 static int sel_make_bools(void)
1200 struct dentry *dentry = NULL;
1201 struct dentry *dir = bool_dir;
1202 struct inode *inode = NULL;
1203 struct inode_security_struct *isec;
1204 char **names = NULL, *page;
1209 /* remove any existing files */
1210 for (i = 0; i < bool_num; i++)
1211 kfree(bool_pending_names[i]);
1212 kfree(bool_pending_names);
1213 kfree(bool_pending_values);
1215 bool_pending_names = NULL;
1216 bool_pending_values = NULL;
1218 sel_remove_entries(dir);
1221 page = (char *)get_zeroed_page(GFP_KERNEL);
1225 ret = security_get_bools(&num, &names, &values);
1229 for (i = 0; i < num; i++) {
1231 dentry = d_alloc_name(dir, names[i]);
1236 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1240 ret = -ENAMETOOLONG;
1241 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1242 if (len >= PAGE_SIZE)
1245 isec = (struct inode_security_struct *)inode->i_security;
1246 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1251 isec->initialized = 1;
1252 inode->i_fop = &sel_bool_ops;
1253 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1254 d_add(dentry, inode);
1257 bool_pending_names = names;
1258 bool_pending_values = values;
1260 free_page((unsigned long)page);
1263 free_page((unsigned long)page);
1266 for (i = 0; i < num; i++)
1271 sel_remove_entries(dir);
1276 #define NULL_FILE_NAME "null"
1278 struct path selinux_null;
1280 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1281 size_t count, loff_t *ppos)
1283 char tmpbuf[TMPBUFLEN];
1286 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1287 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1290 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1291 const char __user *buf,
1292 size_t count, loff_t *ppos)
1299 ret = task_has_security(current, SECURITY__SETSECPARAM);
1304 if (count >= PAGE_SIZE)
1307 /* No partial writes. */
1313 page = (char *)get_zeroed_page(GFP_KERNEL);
1318 if (copy_from_user(page, buf, count))
1322 if (sscanf(page, "%u", &new_value) != 1)
1325 avc_cache_threshold = new_value;
1329 free_page((unsigned long)page);
1333 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1334 size_t count, loff_t *ppos)
1339 page = (char *)__get_free_page(GFP_KERNEL);
1343 length = avc_get_hash_stats(page);
1345 length = simple_read_from_buffer(buf, count, ppos, page, length);
1346 free_page((unsigned long)page);
1351 static const struct file_operations sel_avc_cache_threshold_ops = {
1352 .read = sel_read_avc_cache_threshold,
1353 .write = sel_write_avc_cache_threshold,
1354 .llseek = generic_file_llseek,
1357 static const struct file_operations sel_avc_hash_stats_ops = {
1358 .read = sel_read_avc_hash_stats,
1359 .llseek = generic_file_llseek,
1362 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1363 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1367 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1368 if (!cpu_possible(cpu))
1371 return &per_cpu(avc_cache_stats, cpu);
1376 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1378 loff_t n = *pos - 1;
1381 return SEQ_START_TOKEN;
1383 return sel_avc_get_stat_idx(&n);
1386 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1388 return sel_avc_get_stat_idx(pos);
1391 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1393 struct avc_cache_stats *st = v;
1395 if (v == SEQ_START_TOKEN)
1396 seq_printf(seq, "lookups hits misses allocations reclaims "
1399 unsigned int lookups = st->lookups;
1400 unsigned int misses = st->misses;
1401 unsigned int hits = lookups - misses;
1402 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1403 hits, misses, st->allocations,
1404 st->reclaims, st->frees);
1409 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1412 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1413 .start = sel_avc_stats_seq_start,
1414 .next = sel_avc_stats_seq_next,
1415 .show = sel_avc_stats_seq_show,
1416 .stop = sel_avc_stats_seq_stop,
1419 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1421 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1424 static const struct file_operations sel_avc_cache_stats_ops = {
1425 .open = sel_open_avc_cache_stats,
1427 .llseek = seq_lseek,
1428 .release = seq_release,
1432 static int sel_make_avc_files(struct dentry *dir)
1435 static struct tree_descr files[] = {
1436 { "cache_threshold",
1437 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1438 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1439 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1440 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1444 for (i = 0; i < ARRAY_SIZE(files); i++) {
1445 struct inode *inode;
1446 struct dentry *dentry;
1448 dentry = d_alloc_name(dir, files[i].name);
1452 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1456 inode->i_fop = files[i].ops;
1457 inode->i_ino = ++sel_last_ino;
1458 d_add(dentry, inode);
1464 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1465 size_t count, loff_t *ppos)
1471 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1472 ret = security_sid_to_context(sid, &con, &len);
1476 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1481 static const struct file_operations sel_initcon_ops = {
1482 .read = sel_read_initcon,
1483 .llseek = generic_file_llseek,
1486 static int sel_make_initcon_files(struct dentry *dir)
1490 for (i = 1; i <= SECINITSID_NUM; i++) {
1491 struct inode *inode;
1492 struct dentry *dentry;
1493 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1497 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1501 inode->i_fop = &sel_initcon_ops;
1502 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1503 d_add(dentry, inode);
1509 static inline unsigned long sel_class_to_ino(u16 class)
1511 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1514 static inline u16 sel_ino_to_class(unsigned long ino)
1516 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1519 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1521 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1524 static inline u32 sel_ino_to_perm(unsigned long ino)
1526 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1529 static ssize_t sel_read_class(struct file *file, char __user *buf,
1530 size_t count, loff_t *ppos)
1532 unsigned long ino = file_inode(file)->i_ino;
1533 char res[TMPBUFLEN];
1534 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1535 return simple_read_from_buffer(buf, count, ppos, res, len);
1538 static const struct file_operations sel_class_ops = {
1539 .read = sel_read_class,
1540 .llseek = generic_file_llseek,
1543 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1544 size_t count, loff_t *ppos)
1546 unsigned long ino = file_inode(file)->i_ino;
1547 char res[TMPBUFLEN];
1548 ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1549 return simple_read_from_buffer(buf, count, ppos, res, len);
1552 static const struct file_operations sel_perm_ops = {
1553 .read = sel_read_perm,
1554 .llseek = generic_file_llseek,
1557 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1558 size_t count, loff_t *ppos)
1561 char tmpbuf[TMPBUFLEN];
1563 unsigned long i_ino = file_inode(file)->i_ino;
1565 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1566 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1568 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1571 static const struct file_operations sel_policycap_ops = {
1572 .read = sel_read_policycap,
1573 .llseek = generic_file_llseek,
1576 static int sel_make_perm_files(char *objclass, int classvalue,
1582 rc = security_get_permissions(objclass, &perms, &nperms);
1586 for (i = 0; i < nperms; i++) {
1587 struct inode *inode;
1588 struct dentry *dentry;
1591 dentry = d_alloc_name(dir, perms[i]);
1596 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1600 inode->i_fop = &sel_perm_ops;
1601 /* i+1 since perm values are 1-indexed */
1602 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1603 d_add(dentry, inode);
1607 for (i = 0; i < nperms; i++)
1613 static int sel_make_class_dir_entries(char *classname, int index,
1616 struct dentry *dentry = NULL;
1617 struct inode *inode = NULL;
1620 dentry = d_alloc_name(dir, "index");
1624 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1628 inode->i_fop = &sel_class_ops;
1629 inode->i_ino = sel_class_to_ino(index);
1630 d_add(dentry, inode);
1632 dentry = sel_make_dir(dir, "perms", &last_class_ino);
1634 return PTR_ERR(dentry);
1636 rc = sel_make_perm_files(classname, index, dentry);
1641 static int sel_make_classes(void)
1643 int rc, nclasses, i;
1646 /* delete any existing entries */
1647 sel_remove_entries(class_dir);
1649 rc = security_get_classes(&classes, &nclasses);
1653 /* +2 since classes are 1-indexed */
1654 last_class_ino = sel_class_to_ino(nclasses + 2);
1656 for (i = 0; i < nclasses; i++) {
1657 struct dentry *class_name_dir;
1659 class_name_dir = sel_make_dir(class_dir, classes[i],
1661 if (IS_ERR(class_name_dir)) {
1662 rc = PTR_ERR(class_name_dir);
1666 /* i+1 since class values are 1-indexed */
1667 rc = sel_make_class_dir_entries(classes[i], i + 1,
1674 for (i = 0; i < nclasses; i++)
1680 static int sel_make_policycap(void)
1683 struct dentry *dentry = NULL;
1684 struct inode *inode = NULL;
1686 sel_remove_entries(policycap_dir);
1688 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1689 if (iter < ARRAY_SIZE(policycap_names))
1690 dentry = d_alloc_name(policycap_dir,
1691 policycap_names[iter]);
1693 dentry = d_alloc_name(policycap_dir, "unknown");
1698 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1702 inode->i_fop = &sel_policycap_ops;
1703 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1704 d_add(dentry, inode);
1710 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1713 struct dentry *dentry = d_alloc_name(dir, name);
1714 struct inode *inode;
1717 return ERR_PTR(-ENOMEM);
1719 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1722 return ERR_PTR(-ENOMEM);
1725 inode->i_op = &simple_dir_inode_operations;
1726 inode->i_fop = &simple_dir_operations;
1727 inode->i_ino = ++(*ino);
1728 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1730 d_add(dentry, inode);
1731 /* bump link count on parent directory, too */
1732 inc_nlink(d_inode(dir));
1737 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1740 struct dentry *dentry;
1741 struct inode *inode;
1742 struct inode_security_struct *isec;
1744 static struct tree_descr selinux_files[] = {
1745 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1746 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1747 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1748 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1749 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1750 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1751 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1752 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1753 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1754 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1755 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1756 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1757 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1758 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1759 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1760 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1761 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1764 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1768 bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1769 if (IS_ERR(bool_dir)) {
1770 ret = PTR_ERR(bool_dir);
1776 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1781 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1785 inode->i_ino = ++sel_last_ino;
1786 isec = (struct inode_security_struct *)inode->i_security;
1787 isec->sid = SECINITSID_DEVNULL;
1788 isec->sclass = SECCLASS_CHR_FILE;
1789 isec->initialized = 1;
1791 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1792 d_add(dentry, inode);
1793 selinux_null.dentry = dentry;
1795 dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1796 if (IS_ERR(dentry)) {
1797 ret = PTR_ERR(dentry);
1801 ret = sel_make_avc_files(dentry);
1805 dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1806 if (IS_ERR(dentry)) {
1807 ret = PTR_ERR(dentry);
1811 ret = sel_make_initcon_files(dentry);
1815 class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1816 if (IS_ERR(class_dir)) {
1817 ret = PTR_ERR(class_dir);
1822 policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1823 if (IS_ERR(policycap_dir)) {
1824 ret = PTR_ERR(policycap_dir);
1825 policycap_dir = NULL;
1830 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1835 static struct dentry *sel_mount(struct file_system_type *fs_type,
1836 int flags, const char *dev_name, void *data)
1838 return mount_single(fs_type, flags, data, sel_fill_super);
1841 static struct file_system_type sel_fs_type = {
1842 .name = "selinuxfs",
1844 .kill_sb = kill_litter_super,
1847 struct vfsmount *selinuxfs_mount;
1849 static int __init init_sel_fs(void)
1853 if (!selinux_enabled)
1856 err = sysfs_create_mount_point(fs_kobj, "selinux");
1860 err = register_filesystem(&sel_fs_type);
1862 sysfs_remove_mount_point(fs_kobj, "selinux");
1866 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1867 if (IS_ERR(selinuxfs_mount)) {
1868 printk(KERN_ERR "selinuxfs: could not mount!\n");
1869 err = PTR_ERR(selinuxfs_mount);
1870 selinuxfs_mount = NULL;
1876 __initcall(init_sel_fs);
1878 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1879 void exit_sel_fs(void)
1881 sysfs_remove_mount_point(fs_kobj, "selinux");
1882 kern_unmount(selinuxfs_mount);
1883 unregister_filesystem(&sel_fs_type);