Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2261 insertions, 0 deletions

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
new file mode 100644
index 000000000..a00d19139
--- /dev/null
+++ b/security/selinux/selinuxfs.c
@@ -0,0 +1,2261 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Updated: Karl MacMillan <kmacmillan@tresys.com>
+ *
+ *	Added conditional policy language extensions
+ *
+ *  Updated: Hewlett-Packard <paul@paul-moore.com>
+ *
+ *	Added support for the policy capability bitmap
+ *
+ * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
+ * Copyright (C) 2003 - 2004 Tresys Technology, LLC
+ * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/pagemap.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/mount.h>
+#include <linux/mutex.h>
+#include <linux/namei.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/security.h>
+#include <linux/major.h>
+#include <linux/seq_file.h>
+#include <linux/percpu.h>
+#include <linux/audit.h>
+#include <linux/uaccess.h>
+#include <linux/kobject.h>
+#include <linux/ctype.h>
+
+/* selinuxfs pseudo filesystem for exporting the security policy API.
+   Based on the proc code and the fs/nfsd/nfsctl.c code. */
+
+#include "flask.h"
+#include "avc.h"
+#include "avc_ss.h"
+#include "security.h"
+#include "objsec.h"
+#include "conditional.h"
+#include "ima.h"
+
+enum sel_inos {
+	SEL_ROOT_INO = 2,
+	SEL_LOAD,	/* load policy */
+	SEL_ENFORCE,	/* get or set enforcing status */
+	SEL_CONTEXT,	/* validate context */
+	SEL_ACCESS,	/* compute access decision */
+	SEL_CREATE,	/* compute create labeling decision */
+	SEL_RELABEL,	/* compute relabeling decision */
+	SEL_USER,	/* compute reachable user contexts */
+	SEL_POLICYVERS,	/* return policy version for this kernel */
+	SEL_COMMIT_BOOLS, /* commit new boolean values */
+	SEL_MLS,	/* return if MLS policy is enabled */
+	SEL_DISABLE,	/* disable SELinux until next reboot */
+	SEL_MEMBER,	/* compute polyinstantiation membership decision */
+	SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
+	SEL_COMPAT_NET,	/* whether to use old compat network packet controls */
+	SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
+	SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
+	SEL_STATUS,	/* export current status using mmap() */
+	SEL_POLICY,	/* allow userspace to read the in kernel policy */
+	SEL_VALIDATE_TRANS, /* compute validatetrans decision */
+	SEL_INO_NEXT,	/* The next inode number to use */
+};
+
+struct selinux_fs_info {
+	struct dentry *bool_dir;
+	unsigned int bool_num;
+	char **bool_pending_names;
+	int *bool_pending_values;
+	struct dentry *class_dir;
+	unsigned long last_class_ino;
+	bool policy_opened;
+	struct dentry *policycap_dir;
+	unsigned long last_ino;
+	struct selinux_state *state;
+	struct super_block *sb;
+};
+
+static int selinux_fs_info_create(struct super_block *sb)
+{
+	struct selinux_fs_info *fsi;
+
+	fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
+	if (!fsi)
+		return -ENOMEM;
+
+	fsi->last_ino = SEL_INO_NEXT - 1;
+	fsi->state = &selinux_state;
+	fsi->sb = sb;
+	sb->s_fs_info = fsi;
+	return 0;
+}
+
+static void selinux_fs_info_free(struct super_block *sb)
+{
+	struct selinux_fs_info *fsi = sb->s_fs_info;
+	int i;
+
+	if (fsi) {
+		for (i = 0; i < fsi->bool_num; i++)
+			kfree(fsi->bool_pending_names[i]);
+		kfree(fsi->bool_pending_names);
+		kfree(fsi->bool_pending_values);
+	}
+	kfree(sb->s_fs_info);
+	sb->s_fs_info = NULL;
+}
+
+#define SEL_INITCON_INO_OFFSET		0x01000000
+#define SEL_BOOL_INO_OFFSET		0x02000000
+#define SEL_CLASS_INO_OFFSET		0x04000000
+#define SEL_POLICYCAP_INO_OFFSET	0x08000000
+#define SEL_INO_MASK			0x00ffffff
+
+#define BOOL_DIR_NAME "booleans"
+#define CLASS_DIR_NAME "class"
+#define POLICYCAP_DIR_NAME "policy_capabilities"
+
+#define TMPBUFLEN	12
+static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
+			   enforcing_enabled(fsi->state));
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
+static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
+				 size_t count, loff_t *ppos)
+
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *page = NULL;
+	ssize_t length;
+	int old_value, new_value;
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	length = -EINVAL;
+	if (sscanf(page, "%d", &new_value) != 1)
+		goto out;
+
+	new_value = !!new_value;
+
+	old_value = enforcing_enabled(state);
+	if (new_value != old_value) {
+		length = avc_has_perm(&selinux_state,
+				      current_sid(), SECINITSID_SECURITY,
+				      SECCLASS_SECURITY, SECURITY__SETENFORCE,
+				      NULL);
+		if (length)
+			goto out;
+		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
+			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
+			" enabled=1 old-enabled=1 lsm=selinux res=1",
+			new_value, old_value,
+			from_kuid(&init_user_ns, audit_get_loginuid(current)),
+			audit_get_sessionid(current));
+		enforcing_set(state, new_value);
+		if (new_value)
+			avc_ss_reset(state->avc, 0);
+		selnl_notify_setenforce(new_value);
+		selinux_status_update_setenforce(state, new_value);
+		if (!new_value)
+			call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
+
+		selinux_ima_measure_state(state);
+	}
+	length = count;
+out:
+	kfree(page);
+	return length;
+}
+#else
+#define sel_write_enforce NULL
+#endif
+
+static const struct file_operations sel_enforce_ops = {
+	.read		= sel_read_enforce,
+	.write		= sel_write_enforce,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
+					size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+	ino_t ino = file_inode(filp)->i_ino;
+	int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
+		security_get_reject_unknown(state) :
+		!security_get_allow_unknown(state);
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations sel_handle_unknown_ops = {
+	.read		= sel_read_handle_unknown,
+	.llseek		= generic_file_llseek,
+};
+
+static int sel_open_handle_status(struct inode *inode, struct file *filp)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	struct page    *status = selinux_kernel_status_page(fsi->state);
+
+	if (!status)
+		return -ENOMEM;
+
+	filp->private_data = status;
+
+	return 0;
+}
+
+static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	struct page    *status = filp->private_data;
+
+	BUG_ON(!status);
+
+	return simple_read_from_buffer(buf, count, ppos,
+				       page_address(status),
+				       sizeof(struct selinux_kernel_status));
+}
+
+static int sel_mmap_handle_status(struct file *filp,
+				  struct vm_area_struct *vma)
+{
+	struct page    *status = filp->private_data;
+	unsigned long	size = vma->vm_end - vma->vm_start;
+
+	BUG_ON(!status);
+
+	/* only allows one page from the head */
+	if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
+		return -EIO;
+	/* disallow writable mapping */
+	if (vma->vm_flags & VM_WRITE)
+		return -EPERM;
+	/* disallow mprotect() turns it into writable */
+	vma->vm_flags &= ~VM_MAYWRITE;
+
+	return remap_pfn_range(vma, vma->vm_start,
+			       page_to_pfn(status),
+			       size, vma->vm_page_prot);
+}
+
+static const struct file_operations sel_handle_status_ops = {
+	.open		= sel_open_handle_status,
+	.read		= sel_read_handle_status,
+	.mmap		= sel_mmap_handle_status,
+	.llseek		= generic_file_llseek,
+};
+
+#ifdef CONFIG_SECURITY_SELINUX_DISABLE
+static ssize_t sel_write_disable(struct file *file, const char __user *buf,
+				 size_t count, loff_t *ppos)
+
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	char *page;
+	ssize_t length;
+	int new_value;
+	int enforcing;
+
+	/* NOTE: we are now officially considering runtime disable as
+	 *       deprecated, and using it will become increasingly painful
+	 *       (e.g. sleeping/blocking) as we progress through future
+	 *       kernel releases until eventually it is removed
+	 */
+	pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
+	pr_err("SELinux:  https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-runtime-disable\n");
+	ssleep(5);
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	length = -EINVAL;
+	if (sscanf(page, "%d", &new_value) != 1)
+		goto out;
+
+	if (new_value) {
+		enforcing = enforcing_enabled(fsi->state);
+		length = selinux_disable(fsi->state);
+		if (length)
+			goto out;
+		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
+			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
+			" enabled=0 old-enabled=1 lsm=selinux res=1",
+			enforcing, enforcing,
+			from_kuid(&init_user_ns, audit_get_loginuid(current)),
+			audit_get_sessionid(current));
+	}
+
+	length = count;
+out:
+	kfree(page);
+	return length;
+}
+#else
+#define sel_write_disable NULL
+#endif
+
+static const struct file_operations sel_disable_ops = {
+	.write		= sel_write_disable,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
+				   size_t count, loff_t *ppos)
+{
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations sel_policyvers_ops = {
+	.read		= sel_read_policyvers,
+	.llseek		= generic_file_llseek,
+};
+
+/* declaration for sel_write_load */
+static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
+			  unsigned int *bool_num, char ***bool_pending_names,
+			  int **bool_pending_values);
+static int sel_make_classes(struct selinux_policy *newpolicy,
+			    struct dentry *class_dir,
+			    unsigned long *last_class_ino);
+
+/* declaration for sel_make_class_dirs */
+static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
+			unsigned long *ino);
+
+/* declaration for sel_make_policy_nodes */
+static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
+						unsigned long *ino);
+
+/* declaration for sel_make_policy_nodes */
+static void sel_remove_entries(struct dentry *de);
+
+static ssize_t sel_read_mls(struct file *filp, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
+			   security_mls_enabled(fsi->state));
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations sel_mls_ops = {
+	.read		= sel_read_mls,
+	.llseek		= generic_file_llseek,
+};
+
+struct policy_load_memory {
+	size_t len;
+	void *data;
+};
+
+static int sel_open_policy(struct inode *inode, struct file *filp)
+{
+	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	struct policy_load_memory *plm = NULL;
+	int rc;
+
+	BUG_ON(filp->private_data);
+
+	mutex_lock(&fsi->state->policy_mutex);
+
+	rc = avc_has_perm(&selinux_state,
+			  current_sid(), SECINITSID_SECURITY,
+			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
+	if (rc)
+		goto err;
+
+	rc = -EBUSY;
+	if (fsi->policy_opened)
+		goto err;
+
+	rc = -ENOMEM;
+	plm = kzalloc(sizeof(*plm), GFP_KERNEL);
+	if (!plm)
+		goto err;
+
+	rc = security_read_policy(state, &plm->data, &plm->len);
+	if (rc)
+		goto err;
+
+	if ((size_t)i_size_read(inode) != plm->len) {
+		inode_lock(inode);
+		i_size_write(inode, plm->len);
+		inode_unlock(inode);
+	}
+
+	fsi->policy_opened = 1;
+
+	filp->private_data = plm;
+
+	mutex_unlock(&fsi->state->policy_mutex);
+
+	return 0;
+err:
+	mutex_unlock(&fsi->state->policy_mutex);
+
+	if (plm)
+		vfree(plm->data);
+	kfree(plm);
+	return rc;
+}
+
+static int sel_release_policy(struct inode *inode, struct file *filp)
+{
+	struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
+	struct policy_load_memory *plm = filp->private_data;
+
+	BUG_ON(!plm);
+
+	fsi->policy_opened = 0;
+
+	vfree(plm->data);
+	kfree(plm);
+
+	return 0;
+}
+
+static ssize_t sel_read_policy(struct file *filp, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	struct policy_load_memory *plm = filp->private_data;
+	int ret;
+
+	ret = avc_has_perm(&selinux_state,
+			   current_sid(), SECINITSID_SECURITY,
+			  SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
+	if (ret)
+		return ret;
+
+	return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
+}
+
+static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
+{
+	struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
+	unsigned long offset;
+	struct page *page;
+
+	if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
+		return VM_FAULT_SIGBUS;
+
+	offset = vmf->pgoff << PAGE_SHIFT;
+	if (offset >= roundup(plm->len, PAGE_SIZE))
+		return VM_FAULT_SIGBUS;
+
+	page = vmalloc_to_page(plm->data + offset);
+	get_page(page);
+
+	vmf->page = page;
+
+	return 0;
+}
+
+static const struct vm_operations_struct sel_mmap_policy_ops = {
+	.fault = sel_mmap_policy_fault,
+	.page_mkwrite = sel_mmap_policy_fault,
+};
+
+static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
+{
+	if (vma->vm_flags & VM_SHARED) {
+		/* do not allow mprotect to make mapping writable */
+		vma->vm_flags &= ~VM_MAYWRITE;
+
+		if (vma->vm_flags & VM_WRITE)
+			return -EACCES;
+	}
+
+	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+	vma->vm_ops = &sel_mmap_policy_ops;
+
+	return 0;
+}
+
+static const struct file_operations sel_policy_ops = {
+	.open		= sel_open_policy,
+	.read		= sel_read_policy,
+	.mmap		= sel_mmap_policy,
+	.release	= sel_release_policy,
+	.llseek		= generic_file_llseek,
+};
+
+static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
+				     int *bool_values)
+{
+	u32 i;
+
+	/* bool_dir cleanup */
+	for (i = 0; i < bool_num; i++)
+		kfree(bool_names[i]);
+	kfree(bool_names);
+	kfree(bool_values);
+}
+
+static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
+				struct selinux_policy *newpolicy)
+{
+	int ret = 0;
+	struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
+	unsigned int tmp_bool_num, old_bool_num;
+	char **tmp_bool_names, **old_bool_names;
+	int *tmp_bool_values, *old_bool_values;
+	unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
+
+	tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
+	if (IS_ERR(tmp_parent))
+		return PTR_ERR(tmp_parent);
+
+	tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
+	tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
+	if (IS_ERR(tmp_bool_dir)) {
+		ret = PTR_ERR(tmp_bool_dir);
+		goto out;
+	}
+
+	tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
+	tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
+	if (IS_ERR(tmp_class_dir)) {
+		ret = PTR_ERR(tmp_class_dir);
+		goto out;
+	}
+
+	ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
+			     &tmp_bool_names, &tmp_bool_values);
+	if (ret)
+		goto out;
+
+	ret = sel_make_classes(newpolicy, tmp_class_dir,
+			       &fsi->last_class_ino);
+	if (ret)
+		goto out;
+
+	/* booleans */
+	old_dentry = fsi->bool_dir;
+	lock_rename(tmp_bool_dir, old_dentry);
+	d_exchange(tmp_bool_dir, fsi->bool_dir);
+
+	old_bool_num = fsi->bool_num;
+	old_bool_names = fsi->bool_pending_names;
+	old_bool_values = fsi->bool_pending_values;
+
+	fsi->bool_num = tmp_bool_num;
+	fsi->bool_pending_names = tmp_bool_names;
+	fsi->bool_pending_values = tmp_bool_values;
+
+	sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
+
+	fsi->bool_dir = tmp_bool_dir;
+	unlock_rename(tmp_bool_dir, old_dentry);
+
+	/* classes */
+	old_dentry = fsi->class_dir;
+	lock_rename(tmp_class_dir, old_dentry);
+	d_exchange(tmp_class_dir, fsi->class_dir);
+	fsi->class_dir = tmp_class_dir;
+	unlock_rename(tmp_class_dir, old_dentry);
+
+out:
+	/* Since the other temporary dirs are children of tmp_parent
+	 * this will handle all the cleanup in the case of a failure before
+	 * the swapover
+	 */
+	sel_remove_entries(tmp_parent);
+	dput(tmp_parent); /* d_genocide() only handles the children */
+
+	return ret;
+}
+
+static ssize_t sel_write_load(struct file *file, const char __user *buf,
+			      size_t count, loff_t *ppos)
+
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_load_state load_state;
+	ssize_t length;
+	void *data = NULL;
+
+	mutex_lock(&fsi->state->policy_mutex);
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
+	if (length)
+		goto out;
+
+	/* No partial writes. */
+	length = -EINVAL;
+	if (*ppos != 0)
+		goto out;
+
+	length = -ENOMEM;
+	data = vmalloc(count);
+	if (!data)
+		goto out;
+
+	length = -EFAULT;
+	if (copy_from_user(data, buf, count) != 0)
+		goto out;
+
+	length = security_load_policy(fsi->state, data, count, &load_state);
+	if (length) {
+		pr_warn_ratelimited("SELinux: failed to load policy\n");
+		goto out;
+	}
+
+	length = sel_make_policy_nodes(fsi, load_state.policy);
+	if (length) {
+		pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
+		selinux_policy_cancel(fsi->state, &load_state);
+		goto out;
+	}
+
+	selinux_policy_commit(fsi->state, &load_state);
+
+	length = count;
+
+	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
+		"auid=%u ses=%u lsm=selinux res=1",
+		from_kuid(&init_user_ns, audit_get_loginuid(current)),
+		audit_get_sessionid(current));
+out:
+	mutex_unlock(&fsi->state->policy_mutex);
+	vfree(data);
+	return length;
+}
+
+static const struct file_operations sel_load_ops = {
+	.write		= sel_write_load,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *canon = NULL;
+	u32 sid, len;
+	ssize_t length;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
+	if (length)
+		goto out;
+
+	length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_sid_to_context(state, sid, &canon, &len);
+	if (length)
+		goto out;
+
+	length = -ERANGE;
+	if (len > SIMPLE_TRANSACTION_LIMIT) {
+		pr_err("SELinux: %s:  context size (%u) exceeds "
+			"payload max\n", __func__, len);
+		goto out;
+	}
+
+	memcpy(buf, canon, len);
+	length = len;
+out:
+	kfree(canon);
+	return length;
+}
+
+static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
+				     size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
+			   checkreqprot_get(fsi->state));
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	char *page;
+	ssize_t length;
+	unsigned int new_value;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
+			      NULL);
+	if (length)
+		return length;
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	length = -EINVAL;
+	if (sscanf(page, "%u", &new_value) != 1)
+		goto out;
+
+	if (new_value) {
+		char comm[sizeof(current->comm)];
+
+		memcpy(comm, current->comm, sizeof(comm));
+		pr_err("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
+		       comm, current->pid);
+	}
+
+	checkreqprot_set(fsi->state, (new_value ? 1 : 0));
+	if (new_value)
+		ssleep(5);
+	length = count;
+
+	selinux_ima_measure_state(fsi->state);
+
+out:
+	kfree(page);
+	return length;
+}
+static const struct file_operations sel_checkreqprot_ops = {
+	.read		= sel_read_checkreqprot,
+	.write		= sel_write_checkreqprot,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_write_validatetrans(struct file *file,
+					const char __user *buf,
+					size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
+	char *req = NULL;
+	u32 osid, nsid, tsid;
+	u16 tclass;
+	int rc;
+
+	rc = avc_has_perm(&selinux_state,
+			  current_sid(), SECINITSID_SECURITY,
+			  SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
+	if (rc)
+		goto out;
+
+	rc = -ENOMEM;
+	if (count >= PAGE_SIZE)
+		goto out;
+
+	/* No partial writes. */
+	rc = -EINVAL;
+	if (*ppos != 0)
+		goto out;
+
+	req = memdup_user_nul(buf, count);
+	if (IS_ERR(req)) {
+		rc = PTR_ERR(req);
+		req = NULL;
+		goto out;
+	}
+
+	rc = -ENOMEM;
+	oldcon = kzalloc(count + 1, GFP_KERNEL);
+	if (!oldcon)
+		goto out;
+
+	newcon = kzalloc(count + 1, GFP_KERNEL);
+	if (!newcon)
+		goto out;
+
+	taskcon = kzalloc(count + 1, GFP_KERNEL);
+	if (!taskcon)
+		goto out;
+
+	rc = -EINVAL;
+	if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
+		goto out;
+
+	rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
+	if (rc)
+		goto out;
+
+	rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
+	if (rc)
+		goto out;
+
+	rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
+	if (rc)
+		goto out;
+
+	rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
+	if (!rc)
+		rc = count;
+out:
+	kfree(req);
+	kfree(oldcon);
+	kfree(newcon);
+	kfree(taskcon);
+	return rc;
+}
+
+static const struct file_operations sel_transition_ops = {
+	.write		= sel_write_validatetrans,
+	.llseek		= generic_file_llseek,
+};
+
+/*
+ * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
+ */
+static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
+static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
+static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
+static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
+static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
+
+static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
+	[SEL_ACCESS] = sel_write_access,
+	[SEL_CREATE] = sel_write_create,
+	[SEL_RELABEL] = sel_write_relabel,
+	[SEL_USER] = sel_write_user,
+	[SEL_MEMBER] = sel_write_member,
+	[SEL_CONTEXT] = sel_write_context,
+};
+
+static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
+{
+	ino_t ino = file_inode(file)->i_ino;
+	char *data;
+	ssize_t rv;
+
+	if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
+		return -EINVAL;
+
+	data = simple_transaction_get(file, buf, size);
+	if (IS_ERR(data))
+		return PTR_ERR(data);
+
+	rv = write_op[ino](file, data, size);
+	if (rv > 0) {
+		simple_transaction_set(file, rv);
+		rv = size;
+	}
+	return rv;
+}
+
+static const struct file_operations transaction_ops = {
+	.write		= selinux_transaction_write,
+	.read		= simple_transaction_read,
+	.release	= simple_transaction_release,
+	.llseek		= generic_file_llseek,
+};
+
+/*
+ * payload - write methods
+ * If the method has a response, the response should be put in buf,
+ * and the length returned.  Otherwise return 0 or and -error.
+ */
+
+static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *scon = NULL, *tcon = NULL;
+	u32 ssid, tsid;
+	u16 tclass;
+	struct av_decision avd;
+	ssize_t length;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
+	if (length)
+		goto out;
+
+	length = -ENOMEM;
+	scon = kzalloc(size + 1, GFP_KERNEL);
+	if (!scon)
+		goto out;
+
+	length = -ENOMEM;
+	tcon = kzalloc(size + 1, GFP_KERNEL);
+	if (!tcon)
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+		goto out;
+
+	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	security_compute_av_user(state, ssid, tsid, tclass, &avd);
+
+	length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
+			  "%x %x %x %x %u %x",
+			  avd.allowed, 0xffffffff,
+			  avd.auditallow, avd.auditdeny,
+			  avd.seqno, avd.flags);
+out:
+	kfree(tcon);
+	kfree(scon);
+	return length;
+}
+
+static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *scon = NULL, *tcon = NULL;
+	char *namebuf = NULL, *objname = NULL;
+	u32 ssid, tsid, newsid;
+	u16 tclass;
+	ssize_t length;
+	char *newcon = NULL;
+	u32 len;
+	int nargs;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -ENOMEM;
+	scon = kzalloc(size + 1, GFP_KERNEL);
+	if (!scon)
+		goto out;
+
+	length = -ENOMEM;
+	tcon = kzalloc(size + 1, GFP_KERNEL);
+	if (!tcon)
+		goto out;
+
+	length = -ENOMEM;
+	namebuf = kzalloc(size + 1, GFP_KERNEL);
+	if (!namebuf)
+		goto out;
+
+	length = -EINVAL;
+	nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
+	if (nargs < 3 || nargs > 4)
+		goto out;
+	if (nargs == 4) {
+		/*
+		 * If and when the name of new object to be queried contains
+		 * either whitespace or multibyte characters, they shall be
+		 * encoded based on the percentage-encoding rule.
+		 * If not encoded, the sscanf logic picks up only left-half
+		 * of the supplied name; splitted by a whitespace unexpectedly.
+		 */
+		char   *r, *w;
+		int     c1, c2;
+
+		r = w = namebuf;
+		do {
+			c1 = *r++;
+			if (c1 == '+')
+				c1 = ' ';
+			else if (c1 == '%') {
+				c1 = hex_to_bin(*r++);
+				if (c1 < 0)
+					goto out;
+				c2 = hex_to_bin(*r++);
+				if (c2 < 0)
+					goto out;
+				c1 = (c1 << 4) | c2;
+			}
+			*w++ = c1;
+		} while (c1 != '\0');
+
+		objname = namebuf;
+	}
+
+	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_transition_sid_user(state, ssid, tsid, tclass,
+					      objname, &newsid);
+	if (length)
+		goto out;
+
+	length = security_sid_to_context(state, newsid, &newcon, &len);
+	if (length)
+		goto out;
+
+	length = -ERANGE;
+	if (len > SIMPLE_TRANSACTION_LIMIT) {
+		pr_err("SELinux: %s:  context size (%u) exceeds "
+			"payload max\n", __func__, len);
+		goto out;
+	}
+
+	memcpy(buf, newcon, len);
+	length = len;
+out:
+	kfree(newcon);
+	kfree(namebuf);
+	kfree(tcon);
+	kfree(scon);
+	return length;
+}
+
+static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *scon = NULL, *tcon = NULL;
+	u32 ssid, tsid, newsid;
+	u16 tclass;
+	ssize_t length;
+	char *newcon = NULL;
+	u32 len;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -ENOMEM;
+	scon = kzalloc(size + 1, GFP_KERNEL);
+	if (!scon)
+		goto out;
+
+	length = -ENOMEM;
+	tcon = kzalloc(size + 1, GFP_KERNEL);
+	if (!tcon)
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+		goto out;
+
+	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_change_sid(state, ssid, tsid, tclass, &newsid);
+	if (length)
+		goto out;
+
+	length = security_sid_to_context(state, newsid, &newcon, &len);
+	if (length)
+		goto out;
+
+	length = -ERANGE;
+	if (len > SIMPLE_TRANSACTION_LIMIT)
+		goto out;
+
+	memcpy(buf, newcon, len);
+	length = len;
+out:
+	kfree(newcon);
+	kfree(tcon);
+	kfree(scon);
+	return length;
+}
+
+static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *con = NULL, *user = NULL, *ptr;
+	u32 sid, *sids = NULL;
+	ssize_t length;
+	char *newcon;
+	int i, rc;
+	u32 len, nsids;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -ENOMEM;
+	con = kzalloc(size + 1, GFP_KERNEL);
+	if (!con)
+		goto out;
+
+	length = -ENOMEM;
+	user = kzalloc(size + 1, GFP_KERNEL);
+	if (!user)
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(buf, "%s %s", con, user) != 2)
+		goto out;
+
+	length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_get_user_sids(state, sid, user, &sids, &nsids);
+	if (length)
+		goto out;
+
+	length = sprintf(buf, "%u", nsids) + 1;
+	ptr = buf + length;
+	for (i = 0; i < nsids; i++) {
+		rc = security_sid_to_context(state, sids[i], &newcon, &len);
+		if (rc) {
+			length = rc;
+			goto out;
+		}
+		if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
+			kfree(newcon);
+			length = -ERANGE;
+			goto out;
+		}
+		memcpy(ptr, newcon, len);
+		kfree(newcon);
+		ptr += len;
+		length += len;
+	}
+out:
+	kfree(sids);
+	kfree(user);
+	kfree(con);
+	return length;
+}
+
+static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *scon = NULL, *tcon = NULL;
+	u32 ssid, tsid, newsid;
+	u16 tclass;
+	ssize_t length;
+	char *newcon = NULL;
+	u32 len;
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -ENOMEM;
+	scon = kzalloc(size + 1, GFP_KERNEL);
+	if (!scon)
+		goto out;
+
+	length = -ENOMEM;
+	tcon = kzalloc(size + 1, GFP_KERNEL);
+	if (!tcon)
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
+		goto out;
+
+	length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
+	if (length)
+		goto out;
+
+	length = security_member_sid(state, ssid, tsid, tclass, &newsid);
+	if (length)
+		goto out;
+
+	length = security_sid_to_context(state, newsid, &newcon, &len);
+	if (length)
+		goto out;
+
+	length = -ERANGE;
+	if (len > SIMPLE_TRANSACTION_LIMIT) {
+		pr_err("SELinux: %s:  context size (%u) exceeds "
+			"payload max\n", __func__, len);
+		goto out;
+	}
+
+	memcpy(buf, newcon, len);
+	length = len;
+out:
+	kfree(newcon);
+	kfree(tcon);
+	kfree(scon);
+	return length;
+}
+
+static struct inode *sel_make_inode(struct super_block *sb, int mode)
+{
+	struct inode *ret = new_inode(sb);
+
+	if (ret) {
+		ret->i_mode = mode;
+		ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
+	}
+	return ret;
+}
+
+static ssize_t sel_read_bool(struct file *filep, char __user *buf,
+			     size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
+	char *page = NULL;
+	ssize_t length;
+	ssize_t ret;
+	int cur_enforcing;
+	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
+	const char *name = filep->f_path.dentry->d_name.name;
+
+	mutex_lock(&fsi->state->policy_mutex);
+
+	ret = -EINVAL;
+	if (index >= fsi->bool_num || strcmp(name,
+					     fsi->bool_pending_names[index]))
+		goto out_unlock;
+
+	ret = -ENOMEM;
+	page = (char *)get_zeroed_page(GFP_KERNEL);
+	if (!page)
+		goto out_unlock;
+
+	cur_enforcing = security_get_bool_value(fsi->state, index);
+	if (cur_enforcing < 0) {
+		ret = cur_enforcing;
+		goto out_unlock;
+	}
+	length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
+			  fsi->bool_pending_values[index]);
+	mutex_unlock(&fsi->state->policy_mutex);
+	ret = simple_read_from_buffer(buf, count, ppos, page, length);
+out_free:
+	free_page((unsigned long)page);
+	return ret;
+
+out_unlock:
+	mutex_unlock(&fsi->state->policy_mutex);
+	goto out_free;
+}
+
+static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
+	char *page = NULL;
+	ssize_t length;
+	int new_value;
+	unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
+	const char *name = filep->f_path.dentry->d_name.name;
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	mutex_lock(&fsi->state->policy_mutex);
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__SETBOOL,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -EINVAL;
+	if (index >= fsi->bool_num || strcmp(name,
+					     fsi->bool_pending_names[index]))
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(page, "%d", &new_value) != 1)
+		goto out;
+
+	if (new_value)
+		new_value = 1;
+
+	fsi->bool_pending_values[index] = new_value;
+	length = count;
+
+out:
+	mutex_unlock(&fsi->state->policy_mutex);
+	kfree(page);
+	return length;
+}
+
+static const struct file_operations sel_bool_ops = {
+	.read		= sel_read_bool,
+	.write		= sel_write_bool,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_commit_bools_write(struct file *filep,
+				      const char __user *buf,
+				      size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
+	char *page = NULL;
+	ssize_t length;
+	int new_value;
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	mutex_lock(&fsi->state->policy_mutex);
+
+	length = avc_has_perm(&selinux_state,
+			      current_sid(), SECINITSID_SECURITY,
+			      SECCLASS_SECURITY, SECURITY__SETBOOL,
+			      NULL);
+	if (length)
+		goto out;
+
+	length = -EINVAL;
+	if (sscanf(page, "%d", &new_value) != 1)
+		goto out;
+
+	length = 0;
+	if (new_value && fsi->bool_pending_values)
+		length = security_set_bools(fsi->state, fsi->bool_num,
+					    fsi->bool_pending_values);
+
+	if (!length)
+		length = count;
+
+out:
+	mutex_unlock(&fsi->state->policy_mutex);
+	kfree(page);
+	return length;
+}
+
+static const struct file_operations sel_commit_bools_ops = {
+	.write		= sel_commit_bools_write,
+	.llseek		= generic_file_llseek,
+};
+
+static void sel_remove_entries(struct dentry *de)
+{
+	d_genocide(de);
+	shrink_dcache_parent(de);
+}
+
+static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
+			  unsigned int *bool_num, char ***bool_pending_names,
+			  int **bool_pending_values)
+{
+	int ret;
+	ssize_t len;
+	struct dentry *dentry = NULL;
+	struct inode *inode = NULL;
+	struct inode_security_struct *isec;
+	char **names = NULL, *page;
+	u32 i, num;
+	int *values = NULL;
+	u32 sid;
+
+	ret = -ENOMEM;
+	page = (char *)get_zeroed_page(GFP_KERNEL);
+	if (!page)
+		goto out;
+
+	ret = security_get_bools(newpolicy, &num, &names, &values);
+	if (ret)
+		goto out;
+
+	for (i = 0; i < num; i++) {
+		ret = -ENOMEM;
+		dentry = d_alloc_name(bool_dir, names[i]);
+		if (!dentry)
+			goto out;
+
+		ret = -ENOMEM;
+		inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
+		if (!inode) {
+			dput(dentry);
+			goto out;
+		}
+
+		ret = -ENAMETOOLONG;
+		len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
+		if (len >= PAGE_SIZE) {
+			dput(dentry);
+			iput(inode);
+			goto out;
+		}
+
+		isec = selinux_inode(inode);
+		ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
+					 SECCLASS_FILE, &sid);
+		if (ret) {
+			pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
+					   page);
+			sid = SECINITSID_SECURITY;
+		}
+
+		isec->sid = sid;
+		isec->initialized = LABEL_INITIALIZED;
+		inode->i_fop = &sel_bool_ops;
+		inode->i_ino = i|SEL_BOOL_INO_OFFSET;
+		d_add(dentry, inode);
+	}
+	*bool_num = num;
+	*bool_pending_names = names;
+	*bool_pending_values = values;
+
+	free_page((unsigned long)page);
+	return 0;
+out:
+	free_page((unsigned long)page);
+
+	if (names) {
+		for (i = 0; i < num; i++)
+			kfree(names[i]);
+		kfree(names);
+	}
+	kfree(values);
+	sel_remove_entries(bool_dir);
+
+	return ret;
+}
+
+static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
+					    size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
+			   avc_get_cache_threshold(state->avc));
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static ssize_t sel_write_avc_cache_threshold(struct file *file,
+					     const char __user *buf,
+					     size_t count, loff_t *ppos)
+
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *page;
+	ssize_t ret;
+	unsigned int new_value;
+
+	ret = avc_has_perm(&selinux_state,
+			   current_sid(), SECINITSID_SECURITY,
+			   SECCLASS_SECURITY, SECURITY__SETSECPARAM,
+			   NULL);
+	if (ret)
+		return ret;
+
+	if (count >= PAGE_SIZE)
+		return -ENOMEM;
+
+	/* No partial writes. */
+	if (*ppos != 0)
+		return -EINVAL;
+
+	page = memdup_user_nul(buf, count);
+	if (IS_ERR(page))
+		return PTR_ERR(page);
+
+	ret = -EINVAL;
+	if (sscanf(page, "%u", &new_value) != 1)
+		goto out;
+
+	avc_set_cache_threshold(state->avc, new_value);
+
+	ret = count;
+out:
+	kfree(page);
+	return ret;
+}
+
+static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
+				       size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *page;
+	ssize_t length;
+
+	page = (char *)__get_free_page(GFP_KERNEL);
+	if (!page)
+		return -ENOMEM;
+
+	length = avc_get_hash_stats(state->avc, page);
+	if (length >= 0)
+		length = simple_read_from_buffer(buf, count, ppos, page, length);
+	free_page((unsigned long)page);
+
+	return length;
+}
+
+static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
+					size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
+	struct selinux_state *state = fsi->state;
+	char *page;
+	ssize_t length;
+
+	page = (char *)__get_free_page(GFP_KERNEL);
+	if (!page)
+		return -ENOMEM;
+
+	length = security_sidtab_hash_stats(state, page);
+	if (length >= 0)
+		length = simple_read_from_buffer(buf, count, ppos, page,
+						length);
+	free_page((unsigned long)page);
+
+	return length;
+}
+
+static const struct file_operations sel_sidtab_hash_stats_ops = {
+	.read		= sel_read_sidtab_hash_stats,
+	.llseek		= generic_file_llseek,
+};
+
+static const struct file_operations sel_avc_cache_threshold_ops = {
+	.read		= sel_read_avc_cache_threshold,
+	.write		= sel_write_avc_cache_threshold,
+	.llseek		= generic_file_llseek,
+};
+
+static const struct file_operations sel_avc_hash_stats_ops = {
+	.read		= sel_read_avc_hash_stats,
+	.llseek		= generic_file_llseek,
+};
+
+#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
+static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
+{
+	int cpu;
+
+	for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
+		if (!cpu_possible(cpu))
+			continue;
+		*idx = cpu + 1;
+		return &per_cpu(avc_cache_stats, cpu);
+	}
+	(*idx)++;
+	return NULL;
+}
+
+static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	loff_t n = *pos - 1;
+
+	if (*pos == 0)
+		return SEQ_START_TOKEN;
+
+	return sel_avc_get_stat_idx(&n);
+}
+
+static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return sel_avc_get_stat_idx(pos);
+}
+
+static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
+{
+	struct avc_cache_stats *st = v;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq,
+			 "lookups hits misses allocations reclaims frees\n");
+	} else {
+		unsigned int lookups = st->lookups;
+		unsigned int misses = st->misses;
+		unsigned int hits = lookups - misses;
+		seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
+			   hits, misses, st->allocations,
+			   st->reclaims, st->frees);
+	}
+	return 0;
+}
+
+static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
+{ }
+
+static const struct seq_operations sel_avc_cache_stats_seq_ops = {
+	.start		= sel_avc_stats_seq_start,
+	.next		= sel_avc_stats_seq_next,
+	.show		= sel_avc_stats_seq_show,
+	.stop		= sel_avc_stats_seq_stop,
+};
+
+static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &sel_avc_cache_stats_seq_ops);
+}
+
+static const struct file_operations sel_avc_cache_stats_ops = {
+	.open		= sel_open_avc_cache_stats,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+#endif
+
+static int sel_make_avc_files(struct dentry *dir)
+{
+	struct super_block *sb = dir->d_sb;
+	struct selinux_fs_info *fsi = sb->s_fs_info;
+	int i;
+	static const struct tree_descr files[] = {
+		{ "cache_threshold",
+		  &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
+		{ "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
+#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
+		{ "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
+#endif
+	};
+
+	for (i = 0; i < ARRAY_SIZE(files); i++) {
+		struct inode *inode;
+		struct dentry *dentry;
+
+		dentry = d_alloc_name(dir, files[i].name);
+		if (!dentry)
+			return -ENOMEM;
+
+		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
+		if (!inode) {
+			dput(dentry);
+			return -ENOMEM;
+		}
+
+		inode->i_fop = files[i].ops;
+		inode->i_ino = ++fsi->last_ino;
+		d_add(dentry, inode);
+	}
+
+	return 0;
+}
+
+static int sel_make_ss_files(struct dentry *dir)
+{
+	struct super_block *sb = dir->d_sb;
+	struct selinux_fs_info *fsi = sb->s_fs_info;
+	int i;
+	static struct tree_descr files[] = {
+		{ "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
+	};
+
+	for (i = 0; i < ARRAY_SIZE(files); i++) {
+		struct inode *inode;
+		struct dentry *dentry;
+
+		dentry = d_alloc_name(dir, files[i].name);
+		if (!dentry)
+			return -ENOMEM;
+
+		inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
+		if (!inode) {
+			dput(dentry);
+			return -ENOMEM;
+		}
+
+		inode->i_fop = files[i].ops;
+		inode->i_ino = ++fsi->last_ino;
+		d_add(dentry, inode);
+	}
+
+	return 0;
+}
+
+static ssize_t sel_read_initcon(struct file *file, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	char *con;
+	u32 sid, len;
+	ssize_t ret;
+
+	sid = file_inode(file)->i_ino&SEL_INO_MASK;
+	ret = security_sid_to_context(fsi->state, sid, &con, &len);
+	if (ret)
+		return ret;
+
+	ret = simple_read_from_buffer(buf, count, ppos, con, len);
+	kfree(con);
+	return ret;
+}
+
+static const struct file_operations sel_initcon_ops = {
+	.read		= sel_read_initcon,
+	.llseek		= generic_file_llseek,
+};
+
+static int sel_make_initcon_files(struct dentry *dir)
+{
+	int i;
+
+	for (i = 1; i <= SECINITSID_NUM; i++) {
+		struct inode *inode;
+		struct dentry *dentry;
+		const char *s = security_get_initial_sid_context(i);
+
+		if (!s)
+			continue;
+		dentry = d_alloc_name(dir, s);
+		if (!dentry)
+			return -ENOMEM;
+
+		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
+		if (!inode) {
+			dput(dentry);
+			return -ENOMEM;
+		}
+
+		inode->i_fop = &sel_initcon_ops;
+		inode->i_ino = i|SEL_INITCON_INO_OFFSET;
+		d_add(dentry, inode);
+	}
+
+	return 0;
+}
+
+static inline unsigned long sel_class_to_ino(u16 class)
+{
+	return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
+}
+
+static inline u16 sel_ino_to_class(unsigned long ino)
+{
+	return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
+}
+
+static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
+{
+	return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
+}
+
+static inline u32 sel_ino_to_perm(unsigned long ino)
+{
+	return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
+}
+
+static ssize_t sel_read_class(struct file *file, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	unsigned long ino = file_inode(file)->i_ino;
+	char res[TMPBUFLEN];
+	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
+	return simple_read_from_buffer(buf, count, ppos, res, len);
+}
+
+static const struct file_operations sel_class_ops = {
+	.read		= sel_read_class,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_read_perm(struct file *file, char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	unsigned long ino = file_inode(file)->i_ino;
+	char res[TMPBUFLEN];
+	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
+	return simple_read_from_buffer(buf, count, ppos, res, len);
+}
+
+static const struct file_operations sel_perm_ops = {
+	.read		= sel_read_perm,
+	.llseek		= generic_file_llseek,
+};
+
+static ssize_t sel_read_policycap(struct file *file, char __user *buf,
+				  size_t count, loff_t *ppos)
+{
+	struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
+	int value;
+	char tmpbuf[TMPBUFLEN];
+	ssize_t length;
+	unsigned long i_ino = file_inode(file)->i_ino;
+
+	value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
+	length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
+
+	return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations sel_policycap_ops = {
+	.read		= sel_read_policycap,
+	.llseek		= generic_file_llseek,
+};
+
+static int sel_make_perm_files(struct selinux_policy *newpolicy,
+			char *objclass, int classvalue,
+			struct dentry *dir)
+{
+	int i, rc, nperms;
+	char **perms;
+
+	rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < nperms; i++) {
+		struct inode *inode;
+		struct dentry *dentry;
+
+		rc = -ENOMEM;
+		dentry = d_alloc_name(dir, perms[i]);
+		if (!dentry)
+			goto out;
+
+		rc = -ENOMEM;
+		inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
+		if (!inode) {
+			dput(dentry);
+			goto out;
+		}
+
+		inode->i_fop = &sel_perm_ops;
+		/* i+1 since perm values are 1-indexed */
+		inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
+		d_add(dentry, inode);
+	}
+	rc = 0;
+out:
+	for (i = 0; i < nperms; i++)
+		kfree(perms[i]);
+	kfree(perms);
+	return rc;
+}
+
+static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
+				char *classname, int index,
+				struct dentry *dir)
+{
+	struct super_block *sb = dir->d_sb;
+	struct selinux_fs_info *fsi = sb->s_fs_info;
+	struct dentry *dentry = NULL;
+	struct inode *inode = NULL;
+
+	dentry = d_alloc_name(dir, "index");
+	if (!dentry)
+		return -ENOMEM;
+
+	inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
+	if (!inode) {
+		dput(dentry);
+		return -ENOMEM;
+	}
+
+	inode->i_fop = &sel_class_ops;
+	inode->i_ino = sel_class_to_ino(index);
+	d_add(dentry, inode);
+
+	dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
+	return sel_make_perm_files(newpolicy, classname, index, dentry);
+}
+
+static int sel_make_classes(struct selinux_policy *newpolicy,
+			    struct dentry *class_dir,
+			    unsigned long *last_class_ino)
+{
+
+	int rc, nclasses, i;
+	char **classes;
+
+	rc = security_get_classes(newpolicy, &classes, &nclasses);
+	if (rc)
+		return rc;
+
+	/* +2 since classes are 1-indexed */
+	*last_class_ino = sel_class_to_ino(nclasses + 2);
+
+	for (i = 0; i < nclasses; i++) {
+		struct dentry *class_name_dir;
+
+		class_name_dir = sel_make_dir(class_dir, classes[i],
+					      last_class_ino);
+		if (IS_ERR(class_name_dir)) {
+			rc = PTR_ERR(class_name_dir);
+			goto out;
+		}
+
+		/* i+1 since class values are 1-indexed */
+		rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
+				class_name_dir);
+		if (rc)
+			goto out;
+	}
+	rc = 0;
+out:
+	for (i = 0; i < nclasses; i++)
+		kfree(classes[i]);
+	kfree(classes);
+	return rc;
+}
+
+static int sel_make_policycap(struct selinux_fs_info *fsi)
+{
+	unsigned int iter;
+	struct dentry *dentry = NULL;
+	struct inode *inode = NULL;
+
+	for (iter = 0; iter <= POLICYDB_CAP_MAX; iter++) {
+		if (iter < ARRAY_SIZE(selinux_policycap_names))
+			dentry = d_alloc_name(fsi->policycap_dir,
+					      selinux_policycap_names[iter]);
+		else
+			dentry = d_alloc_name(fsi->policycap_dir, "unknown");
+
+		if (dentry == NULL)
+			return -ENOMEM;
+
+		inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
+		if (inode == NULL) {
+			dput(dentry);
+			return -ENOMEM;
+		}
+
+		inode->i_fop = &sel_policycap_ops;
+		inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
+		d_add(dentry, inode);
+	}
+
+	return 0;
+}
+
+static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
+			unsigned long *ino)
+{
+	struct dentry *dentry = d_alloc_name(dir, name);
+	struct inode *inode;
+
+	if (!dentry)
+		return ERR_PTR(-ENOMEM);
+
+	inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
+	if (!inode) {
+		dput(dentry);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	inode->i_op = &simple_dir_inode_operations;
+	inode->i_fop = &simple_dir_operations;
+	inode->i_ino = ++(*ino);
+	/* directory inodes start off with i_nlink == 2 (for "." entry) */
+	inc_nlink(inode);
+	d_add(dentry, inode);
+	/* bump link count on parent directory, too */
+	inc_nlink(d_inode(dir));
+
+	return dentry;
+}
+
+static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
+						unsigned long *ino)
+{
+	struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
+
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+
+	inode->i_op = &simple_dir_inode_operations;
+	inode->i_fop = &simple_dir_operations;
+	inode->i_ino = ++(*ino);
+	/* directory inodes start off with i_nlink == 2 (for "." entry) */
+	inc_nlink(inode);
+	return d_obtain_alias(inode);
+}
+
+#define NULL_FILE_NAME "null"
+
+static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+	struct selinux_fs_info *fsi;
+	int ret;
+	struct dentry *dentry;
+	struct inode *inode;
+	struct inode_security_struct *isec;
+
+	static const struct tree_descr selinux_files[] = {
+		[SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
+		[SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
+		[SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
+		[SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
+		[SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
+		[SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
+		[SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
+		[SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
+		[SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
+		[SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
+		[SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
+		[SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
+		[SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
+					S_IWUGO},
+		/* last one */ {""}
+	};
+
+	ret = selinux_fs_info_create(sb);
+	if (ret)
+		goto err;
+
+	ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
+	if (ret)
+		goto err;
+
+	fsi = sb->s_fs_info;
+	fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
+	if (IS_ERR(fsi->bool_dir)) {
+		ret = PTR_ERR(fsi->bool_dir);
+		fsi->bool_dir = NULL;
+		goto err;
+	}
+
+	ret = -ENOMEM;
+	dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
+	if (!dentry)
+		goto err;
+
+	ret = -ENOMEM;
+	inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
+	if (!inode) {
+		dput(dentry);
+		goto err;
+	}
+
+	inode->i_ino = ++fsi->last_ino;
+	isec = selinux_inode(inode);
+	isec->sid = SECINITSID_DEVNULL;
+	isec->sclass = SECCLASS_CHR_FILE;
+	isec->initialized = LABEL_INITIALIZED;
+
+	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
+	d_add(dentry, inode);
+
+	dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
+		goto err;
+	}
+
+	ret = sel_make_avc_files(dentry);
+	if (ret)
+		goto err;
+
+	dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
+		goto err;
+	}
+
+	ret = sel_make_ss_files(dentry);
+	if (ret)
+		goto err;
+
+	dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
+	if (IS_ERR(dentry)) {
+		ret = PTR_ERR(dentry);
+		goto err;
+	}
+
+	ret = sel_make_initcon_files(dentry);
+	if (ret)
+		goto err;
+
+	fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
+	if (IS_ERR(fsi->class_dir)) {
+		ret = PTR_ERR(fsi->class_dir);
+		fsi->class_dir = NULL;
+		goto err;
+	}
+
+	fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
+					  &fsi->last_ino);
+	if (IS_ERR(fsi->policycap_dir)) {
+		ret = PTR_ERR(fsi->policycap_dir);
+		fsi->policycap_dir = NULL;
+		goto err;
+	}
+
+	ret = sel_make_policycap(fsi);
+	if (ret) {
+		pr_err("SELinux: failed to load policy capabilities\n");
+		goto err;
+	}
+
+	return 0;
+err:
+	pr_err("SELinux: %s:  failed while creating inodes\n",
+		__func__);
+
+	selinux_fs_info_free(sb);
+
+	return ret;
+}
+
+static int sel_get_tree(struct fs_context *fc)
+{
+	return get_tree_single(fc, sel_fill_super);
+}
+
+static const struct fs_context_operations sel_context_ops = {
+	.get_tree	= sel_get_tree,
+};
+
+static int sel_init_fs_context(struct fs_context *fc)
+{
+	fc->ops = &sel_context_ops;
+	return 0;
+}
+
+static void sel_kill_sb(struct super_block *sb)
+{
+	selinux_fs_info_free(sb);
+	kill_litter_super(sb);
+}
+
+static struct file_system_type sel_fs_type = {
+	.name		= "selinuxfs",
+	.init_fs_context = sel_init_fs_context,
+	.kill_sb	= sel_kill_sb,
+};
+
+static struct vfsmount *selinuxfs_mount __ro_after_init;
+struct path selinux_null __ro_after_init;
+
+static int __init init_sel_fs(void)
+{
+	struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
+					  sizeof(NULL_FILE_NAME)-1);
+	int err;
+
+	if (!selinux_enabled_boot)
+		return 0;
+
+	err = sysfs_create_mount_point(fs_kobj, "selinux");
+	if (err)
+		return err;
+
+	err = register_filesystem(&sel_fs_type);
+	if (err) {
+		sysfs_remove_mount_point(fs_kobj, "selinux");
+		return err;
+	}
+
+	selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
+	if (IS_ERR(selinuxfs_mount)) {
+		pr_err("selinuxfs:  could not mount!\n");
+		err = PTR_ERR(selinuxfs_mount);
+		selinuxfs_mount = NULL;
+	}
+	selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
+						&null_name);
+	if (IS_ERR(selinux_null.dentry)) {
+		pr_err("selinuxfs:  could not lookup null!\n");
+		err = PTR_ERR(selinux_null.dentry);
+		selinux_null.dentry = NULL;
+	}
+
+	return err;
+}
+
+__initcall(init_sel_fs);
+
+#ifdef CONFIG_SECURITY_SELINUX_DISABLE
+void exit_sel_fs(void)
+{
+	sysfs_remove_mount_point(fs_kobj, "selinux");
+	dput(selinux_null.dentry);
+	kern_unmount(selinuxfs_mount);
+	unregister_filesystem(&sel_fs_type);
+}
+#endif