From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 security/apparmor/apparmorfs.c | 2698 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 2698 insertions(+)
 create mode 100644 security/apparmor/apparmorfs.c

(limited to 'security/apparmor/apparmorfs.c')

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
new file mode 100644
index 0000000000..63ddefb6dd
--- /dev/null
+++ b/security/apparmor/apparmorfs.c
@@ -0,0 +1,2698 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /sys/kernel/security/apparmor interface functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ */
+
+#include <linux/ctype.h>
+#include <linux/security.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/capability.h>
+#include <linux/rcupdate.h>
+#include <linux/fs.h>
+#include <linux/fs_context.h>
+#include <linux/poll.h>
+#include <linux/zstd.h>
+#include <uapi/linux/major.h>
+#include <uapi/linux/magic.h>
+
+#include "include/apparmor.h"
+#include "include/apparmorfs.h"
+#include "include/audit.h"
+#include "include/cred.h"
+#include "include/crypto.h"
+#include "include/ipc.h"
+#include "include/label.h"
+#include "include/policy.h"
+#include "include/policy_ns.h"
+#include "include/resource.h"
+#include "include/policy_unpack.h"
+#include "include/task.h"
+
+/*
+ * The apparmor filesystem interface used for policy load and introspection
+ * The interface is split into two main components based on their function
+ * a securityfs component:
+ *   used for static files that are always available, and which allows
+ *   userspace to specificy the location of the security filesystem.
+ *
+ *   fns and data are prefixed with
+ *      aa_sfs_
+ *
+ * an apparmorfs component:
+ *   used loaded policy content and introspection. It is not part of  a
+ *   regular mounted filesystem and is available only through the magic
+ *   policy symlink in the root of the securityfs apparmor/ directory.
+ *   Tasks queries will be magically redirected to the correct portion
+ *   of the policy tree based on their confinement.
+ *
+ *   fns and data are prefixed with
+ *      aafs_
+ *
+ * The aa_fs_ prefix is used to indicate the fn is used by both the
+ * securityfs and apparmorfs filesystems.
+ */
+
+
+/*
+ * support fns
+ */
+
+struct rawdata_f_data {
+	struct aa_loaddata *loaddata;
+};
+
+#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
+#define RAWDATA_F_DATA_BUF(p) (char *)(p + 1)
+
+static void rawdata_f_data_free(struct rawdata_f_data *private)
+{
+	if (!private)
+		return;
+
+	aa_put_loaddata(private->loaddata);
+	kvfree(private);
+}
+
+static struct rawdata_f_data *rawdata_f_data_alloc(size_t size)
+{
+	struct rawdata_f_data *ret;
+
+	if (size > SIZE_MAX - sizeof(*ret))
+		return ERR_PTR(-EINVAL);
+
+	ret = kvzalloc(sizeof(*ret) + size, GFP_KERNEL);
+	if (!ret)
+		return ERR_PTR(-ENOMEM);
+
+	return ret;
+}
+#endif
+
+/**
+ * mangle_name - mangle a profile name to std profile layout form
+ * @name: profile name to mangle  (NOT NULL)
+ * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
+ *
+ * Returns: length of mangled name
+ */
+static int mangle_name(const char *name, char *target)
+{
+	char *t = target;
+
+	while (*name == '/' || *name == '.')
+		name++;
+
+	if (target) {
+		for (; *name; name++) {
+			if (*name == '/')
+				*(t)++ = '.';
+			else if (isspace(*name))
+				*(t)++ = '_';
+			else if (isalnum(*name) || strchr("._-", *name))
+				*(t)++ = *name;
+		}
+
+		*t = 0;
+	} else {
+		int len = 0;
+		for (; *name; name++) {
+			if (isalnum(*name) || isspace(*name) ||
+			    strchr("/._-", *name))
+				len++;
+		}
+
+		return len;
+	}
+
+	return t - target;
+}
+
+
+/*
+ * aafs - core fns and data for the policy tree
+ */
+
+#define AAFS_NAME		"apparmorfs"
+static struct vfsmount *aafs_mnt;
+static int aafs_count;
+
+
+static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
+{
+	seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
+	return 0;
+}
+
+static void aafs_free_inode(struct inode *inode)
+{
+	if (S_ISLNK(inode->i_mode))
+		kfree(inode->i_link);
+	free_inode_nonrcu(inode);
+}
+
+static const struct super_operations aafs_super_ops = {
+	.statfs = simple_statfs,
+	.free_inode = aafs_free_inode,
+	.show_path = aafs_show_path,
+};
+
+static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc)
+{
+	static struct tree_descr files[] = { {""} };
+	int error;
+
+	error = simple_fill_super(sb, AAFS_MAGIC, files);
+	if (error)
+		return error;
+	sb->s_op = &aafs_super_ops;
+
+	return 0;
+}
+
+static int apparmorfs_get_tree(struct fs_context *fc)
+{
+	return get_tree_single(fc, apparmorfs_fill_super);
+}
+
+static const struct fs_context_operations apparmorfs_context_ops = {
+	.get_tree	= apparmorfs_get_tree,
+};
+
+static int apparmorfs_init_fs_context(struct fs_context *fc)
+{
+	fc->ops = &apparmorfs_context_ops;
+	return 0;
+}
+
+static struct file_system_type aafs_ops = {
+	.owner = THIS_MODULE,
+	.name = AAFS_NAME,
+	.init_fs_context = apparmorfs_init_fs_context,
+	.kill_sb = kill_anon_super,
+};
+
+/**
+ * __aafs_setup_d_inode - basic inode setup for apparmorfs
+ * @dir: parent directory for the dentry
+ * @dentry: dentry we are seting the inode up for
+ * @mode: permissions the file should have
+ * @data: data to store on inode.i_private, available in open()
+ * @link: if symlink, symlink target string
+ * @fops: struct file_operations that should be used
+ * @iops: struct of inode_operations that should be used
+ */
+static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
+			       umode_t mode, void *data, char *link,
+			       const struct file_operations *fops,
+			       const struct inode_operations *iops)
+{
+	struct inode *inode = new_inode(dir->i_sb);
+
+	AA_BUG(!dir);
+	AA_BUG(!dentry);
+
+	if (!inode)
+		return -ENOMEM;
+
+	inode->i_ino = get_next_ino();
+	inode->i_mode = mode;
+	inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
+	inode->i_private = data;
+	if (S_ISDIR(mode)) {
+		inode->i_op = iops ? iops : &simple_dir_inode_operations;
+		inode->i_fop = &simple_dir_operations;
+		inc_nlink(inode);
+		inc_nlink(dir);
+	} else if (S_ISLNK(mode)) {
+		inode->i_op = iops ? iops : &simple_symlink_inode_operations;
+		inode->i_link = link;
+	} else {
+		inode->i_fop = fops;
+	}
+	d_instantiate(dentry, inode);
+	dget(dentry);
+
+	return 0;
+}
+
+/**
+ * aafs_create - create a dentry in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @mode: permissions the file should have
+ * @parent: parent directory for this dentry
+ * @data: data to store on inode.i_private, available in open()
+ * @link: if symlink, symlink target string
+ * @fops: struct file_operations that should be used for
+ * @iops: struct of inode_operations that should be used
+ *
+ * This is the basic "create a xxx" function for apparmorfs.
+ *
+ * Returns a pointer to a dentry if it succeeds, that must be free with
+ * aafs_remove(). Will return ERR_PTR on failure.
+ */
+static struct dentry *aafs_create(const char *name, umode_t mode,
+				  struct dentry *parent, void *data, void *link,
+				  const struct file_operations *fops,
+				  const struct inode_operations *iops)
+{
+	struct dentry *dentry;
+	struct inode *dir;
+	int error;
+
+	AA_BUG(!name);
+	AA_BUG(!parent);
+
+	if (!(mode & S_IFMT))
+		mode = (mode & S_IALLUGO) | S_IFREG;
+
+	error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
+	if (error)
+		return ERR_PTR(error);
+
+	dir = d_inode(parent);
+
+	inode_lock(dir);
+	dentry = lookup_one_len(name, parent, strlen(name));
+	if (IS_ERR(dentry)) {
+		error = PTR_ERR(dentry);
+		goto fail_lock;
+	}
+
+	if (d_really_is_positive(dentry)) {
+		error = -EEXIST;
+		goto fail_dentry;
+	}
+
+	error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
+	if (error)
+		goto fail_dentry;
+	inode_unlock(dir);
+
+	return dentry;
+
+fail_dentry:
+	dput(dentry);
+
+fail_lock:
+	inode_unlock(dir);
+	simple_release_fs(&aafs_mnt, &aafs_count);
+
+	return ERR_PTR(error);
+}
+
+/**
+ * aafs_create_file - create a file in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @mode: permissions the file should have
+ * @parent: parent directory for this dentry
+ * @data: data to store on inode.i_private, available in open()
+ * @fops: struct file_operations that should be used for
+ *
+ * see aafs_create
+ */
+static struct dentry *aafs_create_file(const char *name, umode_t mode,
+				       struct dentry *parent, void *data,
+				       const struct file_operations *fops)
+{
+	return aafs_create(name, mode, parent, data, NULL, fops, NULL);
+}
+
+/**
+ * aafs_create_dir - create a directory in the apparmorfs filesystem
+ *
+ * @name: name of dentry to create
+ * @parent: parent directory for this dentry
+ *
+ * see aafs_create
+ */
+static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
+{
+	return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
+			   NULL);
+}
+
+/**
+ * aafs_remove - removes a file or directory from the apparmorfs filesystem
+ *
+ * @dentry: dentry of the file/directory/symlink to removed.
+ */
+static void aafs_remove(struct dentry *dentry)
+{
+	struct inode *dir;
+
+	if (!dentry || IS_ERR(dentry))
+		return;
+
+	dir = d_inode(dentry->d_parent);
+	inode_lock(dir);
+	if (simple_positive(dentry)) {
+		if (d_is_dir(dentry))
+			simple_rmdir(dir, dentry);
+		else
+			simple_unlink(dir, dentry);
+		d_delete(dentry);
+		dput(dentry);
+	}
+	inode_unlock(dir);
+	simple_release_fs(&aafs_mnt, &aafs_count);
+}
+
+
+/*
+ * aa_fs - policy load/replace/remove
+ */
+
+/**
+ * aa_simple_write_to_buffer - common routine for getting policy from user
+ * @userbuf: user buffer to copy data from  (NOT NULL)
+ * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
+ * @copy_size: size of data to copy from user buffer
+ * @pos: position write is at in the file (NOT NULL)
+ *
+ * Returns: kernel buffer containing copy of user buffer data or an
+ *          ERR_PTR on failure.
+ */
+static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
+						     size_t alloc_size,
+						     size_t copy_size,
+						     loff_t *pos)
+{
+	struct aa_loaddata *data;
+
+	AA_BUG(copy_size > alloc_size);
+
+	if (*pos != 0)
+		/* only writes from pos 0, that is complete writes */
+		return ERR_PTR(-ESPIPE);
+
+	/* freed by caller to simple_write_to_buffer */
+	data = aa_loaddata_alloc(alloc_size);
+	if (IS_ERR(data))
+		return data;
+
+	data->size = copy_size;
+	if (copy_from_user(data->data, userbuf, copy_size)) {
+		aa_put_loaddata(data);
+		return ERR_PTR(-EFAULT);
+	}
+
+	return data;
+}
+
+static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
+			     loff_t *pos, struct aa_ns *ns)
+{
+	struct aa_loaddata *data;
+	struct aa_label *label;
+	ssize_t error;
+
+	label = begin_current_label_crit_section();
+
+	/* high level check about policy management - fine grained in
+	 * below after unpack
+	 */
+	error = aa_may_manage_policy(current_cred(), label, ns, mask);
+	if (error)
+		goto end_section;
+
+	data = aa_simple_write_to_buffer(buf, size, size, pos);
+	error = PTR_ERR(data);
+	if (!IS_ERR(data)) {
+		error = aa_replace_profiles(ns, label, mask, data);
+		aa_put_loaddata(data);
+	}
+end_section:
+	end_current_label_crit_section(label);
+
+	return error;
+}
+
+/* .load file hook fn to load policy */
+static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
+			    loff_t *pos)
+{
+	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+	int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
+
+	aa_put_ns(ns);
+
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_load = {
+	.write = profile_load,
+	.llseek = default_llseek,
+};
+
+/* .replace file hook fn to load and/or replace policy */
+static ssize_t profile_replace(struct file *f, const char __user *buf,
+			       size_t size, loff_t *pos)
+{
+	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+	int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
+				  buf, size, pos, ns);
+	aa_put_ns(ns);
+
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_replace = {
+	.write = profile_replace,
+	.llseek = default_llseek,
+};
+
+/* .remove file hook fn to remove loaded policy */
+static ssize_t profile_remove(struct file *f, const char __user *buf,
+			      size_t size, loff_t *pos)
+{
+	struct aa_loaddata *data;
+	struct aa_label *label;
+	ssize_t error;
+	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
+
+	label = begin_current_label_crit_section();
+	/* high level check about policy management - fine grained in
+	 * below after unpack
+	 */
+	error = aa_may_manage_policy(current_cred(), label, ns,
+				     AA_MAY_REMOVE_POLICY);
+	if (error)
+		goto out;
+
+	/*
+	 * aa_remove_profile needs a null terminated string so 1 extra
+	 * byte is allocated and the copied data is null terminated.
+	 */
+	data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
+
+	error = PTR_ERR(data);
+	if (!IS_ERR(data)) {
+		data->data[size] = 0;
+		error = aa_remove_profiles(ns, label, data->data, size);
+		aa_put_loaddata(data);
+	}
+ out:
+	end_current_label_crit_section(label);
+	aa_put_ns(ns);
+	return error;
+}
+
+static const struct file_operations aa_fs_profile_remove = {
+	.write = profile_remove,
+	.llseek = default_llseek,
+};
+
+struct aa_revision {
+	struct aa_ns *ns;
+	long last_read;
+};
+
+/* revision file hook fn for policy loads */
+static int ns_revision_release(struct inode *inode, struct file *file)
+{
+	struct aa_revision *rev = file->private_data;
+
+	if (rev) {
+		aa_put_ns(rev->ns);
+		kfree(rev);
+	}
+
+	return 0;
+}
+
+static ssize_t ns_revision_read(struct file *file, char __user *buf,
+				size_t size, loff_t *ppos)
+{
+	struct aa_revision *rev = file->private_data;
+	char buffer[32];
+	long last_read;
+	int avail;
+
+	mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+	last_read = rev->last_read;
+	if (last_read == rev->ns->revision) {
+		mutex_unlock(&rev->ns->lock);
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+		if (wait_event_interruptible(rev->ns->wait,
+					     last_read !=
+					     READ_ONCE(rev->ns->revision)))
+			return -ERESTARTSYS;
+		mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+	}
+
+	avail = sprintf(buffer, "%ld\n", rev->ns->revision);
+	if (*ppos + size > avail) {
+		rev->last_read = rev->ns->revision;
+		*ppos = 0;
+	}
+	mutex_unlock(&rev->ns->lock);
+
+	return simple_read_from_buffer(buf, size, ppos, buffer, avail);
+}
+
+static int ns_revision_open(struct inode *inode, struct file *file)
+{
+	struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
+
+	if (!rev)
+		return -ENOMEM;
+
+	rev->ns = aa_get_ns(inode->i_private);
+	if (!rev->ns)
+		rev->ns = aa_get_current_ns();
+	file->private_data = rev;
+
+	return 0;
+}
+
+static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
+{
+	struct aa_revision *rev = file->private_data;
+	__poll_t mask = 0;
+
+	if (rev) {
+		mutex_lock_nested(&rev->ns->lock, rev->ns->level);
+		poll_wait(file, &rev->ns->wait, pt);
+		if (rev->last_read < rev->ns->revision)
+			mask |= EPOLLIN | EPOLLRDNORM;
+		mutex_unlock(&rev->ns->lock);
+	}
+
+	return mask;
+}
+
+void __aa_bump_ns_revision(struct aa_ns *ns)
+{
+	WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1);
+	wake_up_interruptible(&ns->wait);
+}
+
+static const struct file_operations aa_fs_ns_revision_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ns_revision_open,
+	.poll		= ns_revision_poll,
+	.read		= ns_revision_read,
+	.llseek		= generic_file_llseek,
+	.release	= ns_revision_release,
+};
+
+static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
+			     const char *match_str, size_t match_len)
+{
+	struct aa_ruleset *rules = list_first_entry(&profile->rules,
+						    typeof(*rules), list);
+	struct aa_perms tmp = { };
+	aa_state_t state = DFA_NOMATCH;
+
+	if (profile_unconfined(profile))
+		return;
+	if (rules->file.dfa && *match_str == AA_CLASS_FILE) {
+		state = aa_dfa_match_len(rules->file.dfa,
+					 rules->file.start[AA_CLASS_FILE],
+					 match_str + 1, match_len - 1);
+		if (state) {
+			struct path_cond cond = { };
+
+			tmp = *(aa_lookup_fperms(&(rules->file), state, &cond));
+		}
+	} else if (rules->policy.dfa) {
+		if (!RULE_MEDIATES(rules, *match_str))
+			return;	/* no change to current perms */
+		state = aa_dfa_match_len(rules->policy.dfa,
+					 rules->policy.start[0],
+					 match_str, match_len);
+		if (state)
+			tmp = *aa_lookup_perms(&rules->policy, state);
+	}
+	aa_apply_modes_to_perms(profile, &tmp);
+	aa_perms_accum_raw(perms, &tmp);
+}
+
+
+/**
+ * query_data - queries a policy and writes its data to buf
+ * @buf: the resulting data is stored here (NOT NULL)
+ * @buf_len: size of buf
+ * @query: query string used to retrieve data
+ * @query_len: size of query including second NUL byte
+ *
+ * The buffers pointed to by buf and query may overlap. The query buffer is
+ * parsed before buf is written to.
+ *
+ * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
+ * the security confinement context and <KEY> is the name of the data to
+ * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
+ *
+ * Don't expect the contents of buf to be preserved on failure.
+ *
+ * Returns: number of characters written to buf or -errno on failure
+ */
+static ssize_t query_data(char *buf, size_t buf_len,
+			  char *query, size_t query_len)
+{
+	char *out;
+	const char *key;
+	struct label_it i;
+	struct aa_label *label, *curr;
+	struct aa_profile *profile;
+	struct aa_data *data;
+	u32 bytes, blocks;
+	__le32 outle32;
+
+	if (!query_len)
+		return -EINVAL; /* need a query */
+
+	key = query + strnlen(query, query_len) + 1;
+	if (key + 1 >= query + query_len)
+		return -EINVAL; /* not enough space for a non-empty key */
+	if (key + strnlen(key, query + query_len - key) >= query + query_len)
+		return -EINVAL; /* must end with NUL */
+
+	if (buf_len < sizeof(bytes) + sizeof(blocks))
+		return -EINVAL; /* not enough space */
+
+	curr = begin_current_label_crit_section();
+	label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
+	end_current_label_crit_section(curr);
+	if (IS_ERR(label))
+		return PTR_ERR(label);
+
+	/* We are going to leave space for two numbers. The first is the total
+	 * number of bytes we are writing after the first number. This is so
+	 * users can read the full output without reallocation.
+	 *
+	 * The second number is the number of data blocks we're writing. An
+	 * application might be confined by multiple policies having data in
+	 * the same key.
+	 */
+	memset(buf, 0, sizeof(bytes) + sizeof(blocks));
+	out = buf + sizeof(bytes) + sizeof(blocks);
+
+	blocks = 0;
+	label_for_each_confined(i, label, profile) {
+		if (!profile->data)
+			continue;
+
+		data = rhashtable_lookup_fast(profile->data, &key,
+					      profile->data->p);
+
+		if (data) {
+			if (out + sizeof(outle32) + data->size > buf +
+			    buf_len) {
+				aa_put_label(label);
+				return -EINVAL; /* not enough space */
+			}
+			outle32 = __cpu_to_le32(data->size);
+			memcpy(out, &outle32, sizeof(outle32));
+			out += sizeof(outle32);
+			memcpy(out, data->data, data->size);
+			out += data->size;
+			blocks++;
+		}
+	}
+	aa_put_label(label);
+
+	outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
+	memcpy(buf, &outle32, sizeof(outle32));
+	outle32 = __cpu_to_le32(blocks);
+	memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
+
+	return out - buf;
+}
+
+/**
+ * query_label - queries a label and writes permissions to buf
+ * @buf: the resulting permissions string is stored here (NOT NULL)
+ * @buf_len: size of buf
+ * @query: binary query string to match against the dfa
+ * @query_len: size of query
+ * @view_only: only compute for querier's view
+ *
+ * The buffers pointed to by buf and query may overlap. The query buffer is
+ * parsed before buf is written to.
+ *
+ * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
+ * the name of the label, in the current namespace, that is to be queried and
+ * DFA_STRING is a binary string to match against the label(s)'s DFA.
+ *
+ * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
+ * but must *not* be NUL terminated.
+ *
+ * Returns: number of characters written to buf or -errno on failure
+ */
+static ssize_t query_label(char *buf, size_t buf_len,
+			   char *query, size_t query_len, bool view_only)
+{
+	struct aa_profile *profile;
+	struct aa_label *label, *curr;
+	char *label_name, *match_str;
+	size_t label_name_len, match_len;
+	struct aa_perms perms;
+	struct label_it i;
+
+	if (!query_len)
+		return -EINVAL;
+
+	label_name = query;
+	label_name_len = strnlen(query, query_len);
+	if (!label_name_len || label_name_len == query_len)
+		return -EINVAL;
+
+	/**
+	 * The extra byte is to account for the null byte between the
+	 * profile name and dfa string. profile_name_len is greater
+	 * than zero and less than query_len, so a byte can be safely
+	 * added or subtracted.
+	 */
+	match_str = label_name + label_name_len + 1;
+	match_len = query_len - label_name_len - 1;
+
+	curr = begin_current_label_crit_section();
+	label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
+	end_current_label_crit_section(curr);
+	if (IS_ERR(label))
+		return PTR_ERR(label);
+
+	perms = allperms;
+	if (view_only) {
+		label_for_each_in_ns(i, labels_ns(label), label, profile) {
+			profile_query_cb(profile, &perms, match_str, match_len);
+		}
+	} else {
+		label_for_each(i, label, profile) {
+			profile_query_cb(profile, &perms, match_str, match_len);
+		}
+	}
+	aa_put_label(label);
+
+	return scnprintf(buf, buf_len,
+		      "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
+		      perms.allow, perms.deny, perms.audit, perms.quiet);
+}
+
+/*
+ * Transaction based IO.
+ * The file expects a write which triggers the transaction, and then
+ * possibly a read(s) which collects the result - which is stored in a
+ * file-local buffer. Once a new write is performed, a new set of results
+ * are stored in the file-local buffer.
+ */
+struct multi_transaction {
+	struct kref count;
+	ssize_t size;
+	char data[];
+};
+
+#define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
+
+static void multi_transaction_kref(struct kref *kref)
+{
+	struct multi_transaction *t;
+
+	t = container_of(kref, struct multi_transaction, count);
+	free_page((unsigned long) t);
+}
+
+static struct multi_transaction *
+get_multi_transaction(struct multi_transaction *t)
+{
+	if  (t)
+		kref_get(&(t->count));
+
+	return t;
+}
+
+static void put_multi_transaction(struct multi_transaction *t)
+{
+	if (t)
+		kref_put(&(t->count), multi_transaction_kref);
+}
+
+/* does not increment @new's count */
+static void multi_transaction_set(struct file *file,
+				  struct multi_transaction *new, size_t n)
+{
+	struct multi_transaction *old;
+
+	AA_BUG(n > MULTI_TRANSACTION_LIMIT);
+
+	new->size = n;
+	spin_lock(&file->f_lock);
+	old = (struct multi_transaction *) file->private_data;
+	file->private_data = new;
+	spin_unlock(&file->f_lock);
+	put_multi_transaction(old);
+}
+
+static struct multi_transaction *multi_transaction_new(struct file *file,
+						       const char __user *buf,
+						       size_t size)
+{
+	struct multi_transaction *t;
+
+	if (size > MULTI_TRANSACTION_LIMIT - 1)
+		return ERR_PTR(-EFBIG);
+
+	t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
+	if (!t)
+		return ERR_PTR(-ENOMEM);
+	kref_init(&t->count);
+	if (copy_from_user(t->data, buf, size)) {
+		put_multi_transaction(t);
+		return ERR_PTR(-EFAULT);
+	}
+
+	return t;
+}
+
+static ssize_t multi_transaction_read(struct file *file, char __user *buf,
+				       size_t size, loff_t *pos)
+{
+	struct multi_transaction *t;
+	ssize_t ret;
+
+	spin_lock(&file->f_lock);
+	t = get_multi_transaction(file->private_data);
+	spin_unlock(&file->f_lock);
+
+	if (!t)
+		return 0;
+
+	ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
+	put_multi_transaction(t);
+
+	return ret;
+}
+
+static int multi_transaction_release(struct inode *inode, struct file *file)
+{
+	put_multi_transaction(file->private_data);
+
+	return 0;
+}
+
+#define QUERY_CMD_LABEL		"label\0"
+#define QUERY_CMD_LABEL_LEN	6
+#define QUERY_CMD_PROFILE	"profile\0"
+#define QUERY_CMD_PROFILE_LEN	8
+#define QUERY_CMD_LABELALL	"labelall\0"
+#define QUERY_CMD_LABELALL_LEN	9
+#define QUERY_CMD_DATA		"data\0"
+#define QUERY_CMD_DATA_LEN	5
+
+/**
+ * aa_write_access - generic permissions and data query
+ * @file: pointer to open apparmorfs/access file
+ * @ubuf: user buffer containing the complete query string (NOT NULL)
+ * @count: size of ubuf
+ * @ppos: position in the file (MUST BE ZERO)
+ *
+ * Allows for one permissions or data query per open(), write(), and read()
+ * sequence. The only queries currently supported are label-based queries for
+ * permissions or data.
+ *
+ * For permissions queries, ubuf must begin with "label\0", followed by the
+ * profile query specific format described in the query_label() function
+ * documentation.
+ *
+ * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
+ * <LABEL> is the name of the security confinement context and <KEY> is the
+ * name of the data to retrieve.
+ *
+ * Returns: number of bytes written or -errno on failure
+ */
+static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
+			       size_t count, loff_t *ppos)
+{
+	struct multi_transaction *t;
+	ssize_t len;
+
+	if (*ppos)
+		return -ESPIPE;
+
+	t = multi_transaction_new(file, ubuf, count);
+	if (IS_ERR(t))
+		return PTR_ERR(t);
+
+	if (count > QUERY_CMD_PROFILE_LEN &&
+	    !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
+		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+				  t->data + QUERY_CMD_PROFILE_LEN,
+				  count - QUERY_CMD_PROFILE_LEN, true);
+	} else if (count > QUERY_CMD_LABEL_LEN &&
+		   !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
+		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+				  t->data + QUERY_CMD_LABEL_LEN,
+				  count - QUERY_CMD_LABEL_LEN, true);
+	} else if (count > QUERY_CMD_LABELALL_LEN &&
+		   !memcmp(t->data, QUERY_CMD_LABELALL,
+			   QUERY_CMD_LABELALL_LEN)) {
+		len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
+				  t->data + QUERY_CMD_LABELALL_LEN,
+				  count - QUERY_CMD_LABELALL_LEN, false);
+	} else if (count > QUERY_CMD_DATA_LEN &&
+		   !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
+		len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
+				 t->data + QUERY_CMD_DATA_LEN,
+				 count - QUERY_CMD_DATA_LEN);
+	} else
+		len = -EINVAL;
+
+	if (len < 0) {
+		put_multi_transaction(t);
+		return len;
+	}
+
+	multi_transaction_set(file, t, len);
+
+	return count;
+}
+
+static const struct file_operations aa_sfs_access = {
+	.write		= aa_write_access,
+	.read		= multi_transaction_read,
+	.release	= multi_transaction_release,
+	.llseek		= generic_file_llseek,
+};
+
+static int aa_sfs_seq_show(struct seq_file *seq, void *v)
+{
+	struct aa_sfs_entry *fs_file = seq->private;
+
+	if (!fs_file)
+		return 0;
+
+	switch (fs_file->v_type) {
+	case AA_SFS_TYPE_BOOLEAN:
+		seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
+		break;
+	case AA_SFS_TYPE_STRING:
+		seq_printf(seq, "%s\n", fs_file->v.string);
+		break;
+	case AA_SFS_TYPE_U64:
+		seq_printf(seq, "%#08lx\n", fs_file->v.u64);
+		break;
+	default:
+		/* Ignore unpritable entry types. */
+		break;
+	}
+
+	return 0;
+}
+
+static int aa_sfs_seq_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, aa_sfs_seq_show, inode->i_private);
+}
+
+const struct file_operations aa_sfs_seq_file_ops = {
+	.owner		= THIS_MODULE,
+	.open		= aa_sfs_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
+/*
+ * profile based file operations
+ *     policy/profiles/XXXX/profiles/ *
+ */
+
+#define SEQ_PROFILE_FOPS(NAME)						      \
+static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
+{									      \
+	return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show);    \
+}									      \
+									      \
+static const struct file_operations seq_profile_ ##NAME ##_fops = {	      \
+	.owner		= THIS_MODULE,					      \
+	.open		= seq_profile_ ##NAME ##_open,			      \
+	.read		= seq_read,					      \
+	.llseek		= seq_lseek,					      \
+	.release	= seq_profile_release,				      \
+}									      \
+
+static int seq_profile_open(struct inode *inode, struct file *file,
+			    int (*show)(struct seq_file *, void *))
+{
+	struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
+	int error = single_open(file, show, proxy);
+
+	if (error) {
+		file->private_data = NULL;
+		aa_put_proxy(proxy);
+	}
+
+	return error;
+}
+
+static int seq_profile_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = (struct seq_file *) file->private_data;
+	if (seq)
+		aa_put_proxy(seq->private);
+	return single_release(inode, file);
+}
+
+static int seq_profile_name_show(struct seq_file *seq, void *v)
+{
+	struct aa_proxy *proxy = seq->private;
+	struct aa_label *label = aa_get_label_rcu(&proxy->label);
+	struct aa_profile *profile = labels_profile(label);
+	seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_label(label);
+
+	return 0;
+}
+
+static int seq_profile_mode_show(struct seq_file *seq, void *v)
+{
+	struct aa_proxy *proxy = seq->private;
+	struct aa_label *label = aa_get_label_rcu(&proxy->label);
+	struct aa_profile *profile = labels_profile(label);
+	seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
+	aa_put_label(label);
+
+	return 0;
+}
+
+static int seq_profile_attach_show(struct seq_file *seq, void *v)
+{
+	struct aa_proxy *proxy = seq->private;
+	struct aa_label *label = aa_get_label_rcu(&proxy->label);
+	struct aa_profile *profile = labels_profile(label);
+	if (profile->attach.xmatch_str)
+		seq_printf(seq, "%s\n", profile->attach.xmatch_str);
+	else if (profile->attach.xmatch.dfa)
+		seq_puts(seq, "<unknown>\n");
+	else
+		seq_printf(seq, "%s\n", profile->base.name);
+	aa_put_label(label);
+
+	return 0;
+}
+
+static int seq_profile_hash_show(struct seq_file *seq, void *v)
+{
+	struct aa_proxy *proxy = seq->private;
+	struct aa_label *label = aa_get_label_rcu(&proxy->label);
+	struct aa_profile *profile = labels_profile(label);
+	unsigned int i, size = aa_hash_size();
+
+	if (profile->hash) {
+		for (i = 0; i < size; i++)
+			seq_printf(seq, "%.2x", profile->hash[i]);
+		seq_putc(seq, '\n');
+	}
+	aa_put_label(label);
+
+	return 0;
+}
+
+SEQ_PROFILE_FOPS(name);
+SEQ_PROFILE_FOPS(mode);
+SEQ_PROFILE_FOPS(attach);
+SEQ_PROFILE_FOPS(hash);
+
+/*
+ * namespace based files
+ *     several root files and
+ *     policy/ *
+ */
+
+#define SEQ_NS_FOPS(NAME)						      \
+static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file)     \
+{									      \
+	return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private);   \
+}									      \
+									      \
+static const struct file_operations seq_ns_ ##NAME ##_fops = {	      \
+	.owner		= THIS_MODULE,					      \
+	.open		= seq_ns_ ##NAME ##_open,			      \
+	.read		= seq_read,					      \
+	.llseek		= seq_lseek,					      \
+	.release	= single_release,				      \
+}									      \
+
+static int seq_ns_stacked_show(struct seq_file *seq, void *v)
+{
+	struct aa_label *label;
+
+	label = begin_current_label_crit_section();
+	seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
+	end_current_label_crit_section(label);
+
+	return 0;
+}
+
+static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
+{
+	struct aa_label *label;
+	struct aa_profile *profile;
+	struct label_it it;
+	int count = 1;
+
+	label = begin_current_label_crit_section();
+
+	if (label->size > 1) {
+		label_for_each(it, label, profile)
+			if (profile->ns != labels_ns(label)) {
+				count++;
+				break;
+			}
+	}
+
+	seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
+	end_current_label_crit_section(label);
+
+	return 0;
+}
+
+static int seq_ns_level_show(struct seq_file *seq, void *v)
+{
+	struct aa_label *label;
+
+	label = begin_current_label_crit_section();
+	seq_printf(seq, "%d\n", labels_ns(label)->level);
+	end_current_label_crit_section(label);
+
+	return 0;
+}
+
+static int seq_ns_name_show(struct seq_file *seq, void *v)
+{
+	struct aa_label *label = begin_current_label_crit_section();
+	seq_printf(seq, "%s\n", labels_ns(label)->base.name);
+	end_current_label_crit_section(label);
+
+	return 0;
+}
+
+static int seq_ns_compress_min_show(struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%d\n", AA_MIN_CLEVEL);
+	return 0;
+}
+
+static int seq_ns_compress_max_show(struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%d\n", AA_MAX_CLEVEL);
+	return 0;
+}
+
+SEQ_NS_FOPS(stacked);
+SEQ_NS_FOPS(nsstacked);
+SEQ_NS_FOPS(level);
+SEQ_NS_FOPS(name);
+SEQ_NS_FOPS(compress_min);
+SEQ_NS_FOPS(compress_max);
+
+
+/* policy/raw_data/ * file ops */
+#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
+#define SEQ_RAWDATA_FOPS(NAME)						      \
+static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
+{									      \
+	return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show);    \
+}									      \
+									      \
+static const struct file_operations seq_rawdata_ ##NAME ##_fops = {	      \
+	.owner		= THIS_MODULE,					      \
+	.open		= seq_rawdata_ ##NAME ##_open,			      \
+	.read		= seq_read,					      \
+	.llseek		= seq_lseek,					      \
+	.release	= seq_rawdata_release,				      \
+}									      \
+
+static int seq_rawdata_open(struct inode *inode, struct file *file,
+			    int (*show)(struct seq_file *, void *))
+{
+	struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
+	int error;
+
+	if (!data)
+		/* lost race this ent is being reaped */
+		return -ENOENT;
+
+	error = single_open(file, show, data);
+	if (error) {
+		AA_BUG(file->private_data &&
+		       ((struct seq_file *)file->private_data)->private);
+		aa_put_loaddata(data);
+	}
+
+	return error;
+}
+
+static int seq_rawdata_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq = (struct seq_file *) file->private_data;
+
+	if (seq)
+		aa_put_loaddata(seq->private);
+
+	return single_release(inode, file);
+}
+
+static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
+{
+	struct aa_loaddata *data = seq->private;
+
+	seq_printf(seq, "v%d\n", data->abi);
+
+	return 0;
+}
+
+static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
+{
+	struct aa_loaddata *data = seq->private;
+
+	seq_printf(seq, "%ld\n", data->revision);
+
+	return 0;
+}
+
+static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
+{
+	struct aa_loaddata *data = seq->private;
+	unsigned int i, size = aa_hash_size();
+
+	if (data->hash) {
+		for (i = 0; i < size; i++)
+			seq_printf(seq, "%.2x", data->hash[i]);
+		seq_putc(seq, '\n');
+	}
+
+	return 0;
+}
+
+static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v)
+{
+	struct aa_loaddata *data = seq->private;
+
+	seq_printf(seq, "%zu\n", data->compressed_size);
+
+	return 0;
+}
+
+SEQ_RAWDATA_FOPS(abi);
+SEQ_RAWDATA_FOPS(revision);
+SEQ_RAWDATA_FOPS(hash);
+SEQ_RAWDATA_FOPS(compressed_size);
+
+static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
+{
+#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
+	if (slen < dlen) {
+		const size_t wksp_len = zstd_dctx_workspace_bound();
+		zstd_dctx *ctx;
+		void *wksp;
+		size_t out_len;
+		int ret = 0;
+
+		wksp = kvzalloc(wksp_len, GFP_KERNEL);
+		if (!wksp) {
+			ret = -ENOMEM;
+			goto cleanup;
+		}
+		ctx = zstd_init_dctx(wksp, wksp_len);
+		if (ctx == NULL) {
+			ret = -ENOMEM;
+			goto cleanup;
+		}
+		out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen);
+		if (zstd_is_error(out_len)) {
+			ret = -EINVAL;
+			goto cleanup;
+		}
+cleanup:
+		kvfree(wksp);
+		return ret;
+	}
+#endif
+
+	if (dlen < slen)
+		return -EINVAL;
+	memcpy(dst, src, slen);
+	return 0;
+}
+
+static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
+			    loff_t *ppos)
+{
+	struct rawdata_f_data *private = file->private_data;
+
+	return simple_read_from_buffer(buf, size, ppos,
+				       RAWDATA_F_DATA_BUF(private),
+				       private->loaddata->size);
+}
+
+static int rawdata_release(struct inode *inode, struct file *file)
+{
+	rawdata_f_data_free(file->private_data);
+
+	return 0;
+}
+
+static int rawdata_open(struct inode *inode, struct file *file)
+{
+	int error;
+	struct aa_loaddata *loaddata;
+	struct rawdata_f_data *private;
+
+	if (!aa_current_policy_view_capable(NULL))
+		return -EACCES;
+
+	loaddata = __aa_get_loaddata(inode->i_private);
+	if (!loaddata)
+		/* lost race: this entry is being reaped */
+		return -ENOENT;
+
+	private = rawdata_f_data_alloc(loaddata->size);
+	if (IS_ERR(private)) {
+		error = PTR_ERR(private);
+		goto fail_private_alloc;
+	}
+
+	private->loaddata = loaddata;
+
+	error = decompress_zstd(loaddata->data, loaddata->compressed_size,
+				RAWDATA_F_DATA_BUF(private),
+				loaddata->size);
+	if (error)
+		goto fail_decompress;
+
+	file->private_data = private;
+	return 0;
+
+fail_decompress:
+	rawdata_f_data_free(private);
+	return error;
+
+fail_private_alloc:
+	aa_put_loaddata(loaddata);
+	return error;
+}
+
+static const struct file_operations rawdata_fops = {
+	.open = rawdata_open,
+	.read = rawdata_read,
+	.llseek = generic_file_llseek,
+	.release = rawdata_release,
+};
+
+static void remove_rawdata_dents(struct aa_loaddata *rawdata)
+{
+	int i;
+
+	for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
+		if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
+			/* no refcounts on i_private */
+			aafs_remove(rawdata->dents[i]);
+			rawdata->dents[i] = NULL;
+		}
+	}
+}
+
+void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
+{
+	AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
+
+	if (rawdata->ns) {
+		remove_rawdata_dents(rawdata);
+		list_del_init(&rawdata->list);
+		aa_put_ns(rawdata->ns);
+		rawdata->ns = NULL;
+	}
+}
+
+int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
+{
+	struct dentry *dent, *dir;
+
+	AA_BUG(!ns);
+	AA_BUG(!rawdata);
+	AA_BUG(!mutex_is_locked(&ns->lock));
+	AA_BUG(!ns_subdata_dir(ns));
+
+	/*
+	 * just use ns revision dir was originally created at. This is
+	 * under ns->lock and if load is successful revision will be
+	 * bumped and is guaranteed to be unique
+	 */
+	rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
+	if (!rawdata->name)
+		return -ENOMEM;
+
+	dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
+	if (IS_ERR(dir))
+		/* ->name freed when rawdata freed */
+		return PTR_ERR(dir);
+	rawdata->dents[AAFS_LOADDATA_DIR] = dir;
+
+	dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
+				      &seq_rawdata_abi_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	rawdata->dents[AAFS_LOADDATA_ABI] = dent;
+
+	dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
+				      &seq_rawdata_revision_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
+
+	if (aa_g_hash_policy) {
+		dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
+					      rawdata, &seq_rawdata_hash_fops);
+		if (IS_ERR(dent))
+			goto fail;
+		rawdata->dents[AAFS_LOADDATA_HASH] = dent;
+	}
+
+	dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir,
+				rawdata,
+				&seq_rawdata_compressed_size_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent;
+
+	dent = aafs_create_file("raw_data", S_IFREG | 0444,
+				      dir, rawdata, &rawdata_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	rawdata->dents[AAFS_LOADDATA_DATA] = dent;
+	d_inode(dent)->i_size = rawdata->size;
+
+	rawdata->ns = aa_get_ns(ns);
+	list_add(&rawdata->list, &ns->rawdata_list);
+	/* no refcount on inode rawdata */
+
+	return 0;
+
+fail:
+	remove_rawdata_dents(rawdata);
+
+	return PTR_ERR(dent);
+}
+#endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
+
+
+/** fns to setup dynamic per profile/namespace files **/
+
+/*
+ *
+ * Requires: @profile->ns->lock held
+ */
+void __aafs_profile_rmdir(struct aa_profile *profile)
+{
+	struct aa_profile *child;
+	int i;
+
+	if (!profile)
+		return;
+
+	list_for_each_entry(child, &profile->base.profiles, base.list)
+		__aafs_profile_rmdir(child);
+
+	for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
+		struct aa_proxy *proxy;
+		if (!profile->dents[i])
+			continue;
+
+		proxy = d_inode(profile->dents[i])->i_private;
+		aafs_remove(profile->dents[i]);
+		aa_put_proxy(proxy);
+		profile->dents[i] = NULL;
+	}
+}
+
+/*
+ *
+ * Requires: @old->ns->lock held
+ */
+void __aafs_profile_migrate_dents(struct aa_profile *old,
+				  struct aa_profile *new)
+{
+	int i;
+
+	AA_BUG(!old);
+	AA_BUG(!new);
+	AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
+
+	for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
+		new->dents[i] = old->dents[i];
+		if (new->dents[i]) {
+			struct inode *inode = d_inode(new->dents[i]);
+
+			inode->i_mtime = inode_set_ctime_current(inode);
+		}
+		old->dents[i] = NULL;
+	}
+}
+
+static struct dentry *create_profile_file(struct dentry *dir, const char *name,
+					  struct aa_profile *profile,
+					  const struct file_operations *fops)
+{
+	struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
+	struct dentry *dent;
+
+	dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
+	if (IS_ERR(dent))
+		aa_put_proxy(proxy);
+
+	return dent;
+}
+
+#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
+static int profile_depth(struct aa_profile *profile)
+{
+	int depth = 0;
+
+	rcu_read_lock();
+	for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
+		depth++;
+	rcu_read_unlock();
+
+	return depth;
+}
+
+static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
+{
+	char *buffer, *s;
+	int error;
+	int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
+
+	s = buffer = kmalloc(size, GFP_KERNEL);
+	if (!buffer)
+		return ERR_PTR(-ENOMEM);
+
+	for (; depth > 0; depth--) {
+		strcpy(s, "../../");
+		s += 6;
+		size -= 6;
+	}
+
+	error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
+	if (error >= size || error < 0) {
+		kfree(buffer);
+		return ERR_PTR(-ENAMETOOLONG);
+	}
+
+	return buffer;
+}
+
+static void rawdata_link_cb(void *arg)
+{
+	kfree(arg);
+}
+
+static const char *rawdata_get_link_base(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done,
+					 const char *name)
+{
+	struct aa_proxy *proxy = inode->i_private;
+	struct aa_label *label;
+	struct aa_profile *profile;
+	char *target;
+	int depth;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	label = aa_get_label_rcu(&proxy->label);
+	profile = labels_profile(label);
+	depth = profile_depth(profile);
+	target = gen_symlink_name(depth, profile->rawdata->name, name);
+	aa_put_label(label);
+
+	if (IS_ERR(target))
+		return target;
+
+	set_delayed_call(done, rawdata_link_cb, target);
+
+	return target;
+}
+
+static const char *rawdata_get_link_sha1(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "sha1");
+}
+
+static const char *rawdata_get_link_abi(struct dentry *dentry,
+					struct inode *inode,
+					struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "abi");
+}
+
+static const char *rawdata_get_link_data(struct dentry *dentry,
+					 struct inode *inode,
+					 struct delayed_call *done)
+{
+	return rawdata_get_link_base(dentry, inode, done, "raw_data");
+}
+
+static const struct inode_operations rawdata_link_sha1_iops = {
+	.get_link	= rawdata_get_link_sha1,
+};
+
+static const struct inode_operations rawdata_link_abi_iops = {
+	.get_link	= rawdata_get_link_abi,
+};
+static const struct inode_operations rawdata_link_data_iops = {
+	.get_link	= rawdata_get_link_data,
+};
+#endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
+
+/*
+ * Requires: @profile->ns->lock held
+ */
+int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
+{
+	struct aa_profile *child;
+	struct dentry *dent = NULL, *dir;
+	int error;
+
+	AA_BUG(!profile);
+	AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
+
+	if (!parent) {
+		struct aa_profile *p;
+		p = aa_deref_parent(profile);
+		dent = prof_dir(p);
+		/* adding to parent that previously didn't have children */
+		dent = aafs_create_dir("profiles", dent);
+		if (IS_ERR(dent))
+			goto fail;
+		prof_child_dir(p) = parent = dent;
+	}
+
+	if (!profile->dirname) {
+		int len, id_len;
+		len = mangle_name(profile->base.name, NULL);
+		id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
+
+		profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
+		if (!profile->dirname) {
+			error = -ENOMEM;
+			goto fail2;
+		}
+
+		mangle_name(profile->base.name, profile->dirname);
+		sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
+	}
+
+	dent = aafs_create_dir(profile->dirname, parent);
+	if (IS_ERR(dent))
+		goto fail;
+	prof_dir(profile) = dir = dent;
+
+	dent = create_profile_file(dir, "name", profile,
+				   &seq_profile_name_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_NAME] = dent;
+
+	dent = create_profile_file(dir, "mode", profile,
+				   &seq_profile_mode_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_MODE] = dent;
+
+	dent = create_profile_file(dir, "attach", profile,
+				   &seq_profile_attach_fops);
+	if (IS_ERR(dent))
+		goto fail;
+	profile->dents[AAFS_PROF_ATTACH] = dent;
+
+	if (profile->hash) {
+		dent = create_profile_file(dir, "sha1", profile,
+					   &seq_profile_hash_fops);
+		if (IS_ERR(dent))
+			goto fail;
+		profile->dents[AAFS_PROF_HASH] = dent;
+	}
+
+#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
+	if (profile->rawdata) {
+		if (aa_g_hash_policy) {
+			dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
+					   profile->label.proxy, NULL, NULL,
+					   &rawdata_link_sha1_iops);
+			if (IS_ERR(dent))
+				goto fail;
+			aa_get_proxy(profile->label.proxy);
+			profile->dents[AAFS_PROF_RAW_HASH] = dent;
+		}
+		dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
+				   profile->label.proxy, NULL, NULL,
+				   &rawdata_link_abi_iops);
+		if (IS_ERR(dent))
+			goto fail;
+		aa_get_proxy(profile->label.proxy);
+		profile->dents[AAFS_PROF_RAW_ABI] = dent;
+
+		dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
+				   profile->label.proxy, NULL, NULL,
+				   &rawdata_link_data_iops);
+		if (IS_ERR(dent))
+			goto fail;
+		aa_get_proxy(profile->label.proxy);
+		profile->dents[AAFS_PROF_RAW_DATA] = dent;
+	}
+#endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
+
+	list_for_each_entry(child, &profile->base.profiles, base.list) {
+		error = __aafs_profile_mkdir(child, prof_child_dir(profile));
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aafs_profile_rmdir(profile);
+
+	return error;
+}
+
+static int ns_mkdir_op(struct mnt_idmap *idmap, struct inode *dir,
+		       struct dentry *dentry, umode_t mode)
+{
+	struct aa_ns *ns, *parent;
+	/* TODO: improve permission check */
+	struct aa_label *label;
+	int error;
+
+	label = begin_current_label_crit_section();
+	error = aa_may_manage_policy(current_cred(), label, NULL,
+				     AA_MAY_LOAD_POLICY);
+	end_current_label_crit_section(label);
+	if (error)
+		return error;
+
+	parent = aa_get_ns(dir->i_private);
+	AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
+
+	/* we have to unlock and then relock to get locking order right
+	 * for pin_fs
+	 */
+	inode_unlock(dir);
+	error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
+	mutex_lock_nested(&parent->lock, parent->level);
+	inode_lock_nested(dir, I_MUTEX_PARENT);
+	if (error)
+		goto out;
+
+	error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR,  NULL,
+				     NULL, NULL, NULL);
+	if (error)
+		goto out_pin;
+
+	ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
+				    dentry);
+	if (IS_ERR(ns)) {
+		error = PTR_ERR(ns);
+		ns = NULL;
+	}
+
+	aa_put_ns(ns);		/* list ref remains */
+out_pin:
+	if (error)
+		simple_release_fs(&aafs_mnt, &aafs_count);
+out:
+	mutex_unlock(&parent->lock);
+	aa_put_ns(parent);
+
+	return error;
+}
+
+static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
+{
+	struct aa_ns *ns, *parent;
+	/* TODO: improve permission check */
+	struct aa_label *label;
+	int error;
+
+	label = begin_current_label_crit_section();
+	error = aa_may_manage_policy(current_cred(), label, NULL,
+				     AA_MAY_LOAD_POLICY);
+	end_current_label_crit_section(label);
+	if (error)
+		return error;
+
+	parent = aa_get_ns(dir->i_private);
+	/* rmdir calls the generic securityfs functions to remove files
+	 * from the apparmor dir. It is up to the apparmor ns locking
+	 * to avoid races.
+	 */
+	inode_unlock(dir);
+	inode_unlock(dentry->d_inode);
+
+	mutex_lock_nested(&parent->lock, parent->level);
+	ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
+				     dentry->d_name.len));
+	if (!ns) {
+		error = -ENOENT;
+		goto out;
+	}
+	AA_BUG(ns_dir(ns) != dentry);
+
+	__aa_remove_ns(ns);
+	aa_put_ns(ns);
+
+out:
+	mutex_unlock(&parent->lock);
+	inode_lock_nested(dir, I_MUTEX_PARENT);
+	inode_lock(dentry->d_inode);
+	aa_put_ns(parent);
+
+	return error;
+}
+
+static const struct inode_operations ns_dir_inode_operations = {
+	.lookup		= simple_lookup,
+	.mkdir		= ns_mkdir_op,
+	.rmdir		= ns_rmdir_op,
+};
+
+static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
+{
+	struct aa_loaddata *ent, *tmp;
+
+	AA_BUG(!mutex_is_locked(&ns->lock));
+
+	list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
+		__aa_fs_remove_rawdata(ent);
+}
+
+/*
+ *
+ * Requires: @ns->lock held
+ */
+void __aafs_ns_rmdir(struct aa_ns *ns)
+{
+	struct aa_ns *sub;
+	struct aa_profile *child;
+	int i;
+
+	if (!ns)
+		return;
+	AA_BUG(!mutex_is_locked(&ns->lock));
+
+	list_for_each_entry(child, &ns->base.profiles, base.list)
+		__aafs_profile_rmdir(child);
+
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock_nested(&sub->lock, sub->level);
+		__aafs_ns_rmdir(sub);
+		mutex_unlock(&sub->lock);
+	}
+
+	__aa_fs_list_remove_rawdata(ns);
+
+	if (ns_subns_dir(ns)) {
+		sub = d_inode(ns_subns_dir(ns))->i_private;
+		aa_put_ns(sub);
+	}
+	if (ns_subload(ns)) {
+		sub = d_inode(ns_subload(ns))->i_private;
+		aa_put_ns(sub);
+	}
+	if (ns_subreplace(ns)) {
+		sub = d_inode(ns_subreplace(ns))->i_private;
+		aa_put_ns(sub);
+	}
+	if (ns_subremove(ns)) {
+		sub = d_inode(ns_subremove(ns))->i_private;
+		aa_put_ns(sub);
+	}
+	if (ns_subrevision(ns)) {
+		sub = d_inode(ns_subrevision(ns))->i_private;
+		aa_put_ns(sub);
+	}
+
+	for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
+		aafs_remove(ns->dents[i]);
+		ns->dents[i] = NULL;
+	}
+}
+
+/* assumes cleanup in caller */
+static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
+{
+	struct dentry *dent;
+
+	AA_BUG(!ns);
+	AA_BUG(!dir);
+
+	dent = aafs_create_dir("profiles", dir);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	ns_subprofs_dir(ns) = dent;
+
+	dent = aafs_create_dir("raw_data", dir);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	ns_subdata_dir(ns) = dent;
+
+	dent = aafs_create_file("revision", 0444, dir, ns,
+				&aa_fs_ns_revision_fops);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	aa_get_ns(ns);
+	ns_subrevision(ns) = dent;
+
+	dent = aafs_create_file(".load", 0640, dir, ns,
+				      &aa_fs_profile_load);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	aa_get_ns(ns);
+	ns_subload(ns) = dent;
+
+	dent = aafs_create_file(".replace", 0640, dir, ns,
+				      &aa_fs_profile_replace);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	aa_get_ns(ns);
+	ns_subreplace(ns) = dent;
+
+	dent = aafs_create_file(".remove", 0640, dir, ns,
+				      &aa_fs_profile_remove);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	aa_get_ns(ns);
+	ns_subremove(ns) = dent;
+
+	  /* use create_dentry so we can supply private data */
+	dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
+			   &ns_dir_inode_operations);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+	aa_get_ns(ns);
+	ns_subns_dir(ns) = dent;
+
+	return 0;
+}
+
+/*
+ * Requires: @ns->lock held
+ */
+int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
+		    struct dentry *dent)
+{
+	struct aa_ns *sub;
+	struct aa_profile *child;
+	struct dentry *dir;
+	int error;
+
+	AA_BUG(!ns);
+	AA_BUG(!parent);
+	AA_BUG(!mutex_is_locked(&ns->lock));
+
+	if (!name)
+		name = ns->base.name;
+
+	if (!dent) {
+		/* create ns dir if it doesn't already exist */
+		dent = aafs_create_dir(name, parent);
+		if (IS_ERR(dent))
+			goto fail;
+	} else
+		dget(dent);
+	ns_dir(ns) = dir = dent;
+	error = __aafs_ns_mkdir_entries(ns, dir);
+	if (error)
+		goto fail2;
+
+	/* profiles */
+	list_for_each_entry(child, &ns->base.profiles, base.list) {
+		error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
+		if (error)
+			goto fail2;
+	}
+
+	/* subnamespaces */
+	list_for_each_entry(sub, &ns->sub_ns, base.list) {
+		mutex_lock_nested(&sub->lock, sub->level);
+		error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
+		mutex_unlock(&sub->lock);
+		if (error)
+			goto fail2;
+	}
+
+	return 0;
+
+fail:
+	error = PTR_ERR(dent);
+
+fail2:
+	__aafs_ns_rmdir(ns);
+
+	return error;
+}
+
+/**
+ * __next_ns - find the next namespace to list
+ * @root: root namespace to stop search at (NOT NULL)
+ * @ns: current ns position (NOT NULL)
+ *
+ * Find the next namespace from @ns under @root and handle all locking needed
+ * while switching current namespace.
+ *
+ * Returns: next namespace or NULL if at last namespace under @root
+ * Requires: ns->parent->lock to be held
+ * NOTE: will not unlock root->lock
+ */
+static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
+{
+	struct aa_ns *parent, *next;
+
+	AA_BUG(!root);
+	AA_BUG(!ns);
+	AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
+
+	/* is next namespace a child */
+	if (!list_empty(&ns->sub_ns)) {
+		next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
+		mutex_lock_nested(&next->lock, next->level);
+		return next;
+	}
+
+	/* check if the next ns is a sibling, parent, gp, .. */
+	parent = ns->parent;
+	while (ns != root) {
+		mutex_unlock(&ns->lock);
+		next = list_next_entry(ns, base.list);
+		if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
+			mutex_lock_nested(&next->lock, next->level);
+			return next;
+		}
+		ns = parent;
+		parent = parent->parent;
+	}
+
+	return NULL;
+}
+
+/**
+ * __first_profile - find the first profile in a namespace
+ * @root: namespace that is root of profiles being displayed (NOT NULL)
+ * @ns: namespace to start in   (NOT NULL)
+ *
+ * Returns: unrefcounted profile or NULL if no profile
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__first_profile(struct aa_ns *root,
+					  struct aa_ns *ns)
+{
+	AA_BUG(!root);
+	AA_BUG(ns && !mutex_is_locked(&ns->lock));
+
+	for (; ns; ns = __next_ns(root, ns)) {
+		if (!list_empty(&ns->base.profiles))
+			return list_first_entry(&ns->base.profiles,
+						struct aa_profile, base.list);
+	}
+	return NULL;
+}
+
+/**
+ * __next_profile - step to the next profile in a profile tree
+ * @p: current profile in tree (NOT NULL)
+ *
+ * Perform a depth first traversal on the profile tree in a namespace
+ *
+ * Returns: next profile or NULL if done
+ * Requires: profile->ns.lock to be held
+ */
+static struct aa_profile *__next_profile(struct aa_profile *p)
+{
+	struct aa_profile *parent;
+	struct aa_ns *ns = p->ns;
+
+	AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
+
+	/* is next profile a child */
+	if (!list_empty(&p->base.profiles))
+		return list_first_entry(&p->base.profiles, typeof(*p),
+					base.list);
+
+	/* is next profile a sibling, parent sibling, gp, sibling, .. */
+	parent = rcu_dereference_protected(p->parent,
+					   mutex_is_locked(&p->ns->lock));
+	while (parent) {
+		p = list_next_entry(p, base.list);
+		if (!list_entry_is_head(p, &parent->base.profiles, base.list))
+			return p;
+		p = parent;
+		parent = rcu_dereference_protected(parent->parent,
+					    mutex_is_locked(&parent->ns->lock));
+	}
+
+	/* is next another profile in the namespace */
+	p = list_next_entry(p, base.list);
+	if (!list_entry_is_head(p, &ns->base.profiles, base.list))
+		return p;
+
+	return NULL;
+}
+
+/**
+ * next_profile - step to the next profile in where ever it may be
+ * @root: root namespace  (NOT NULL)
+ * @profile: current profile  (NOT NULL)
+ *
+ * Returns: next profile or NULL if there isn't one
+ */
+static struct aa_profile *next_profile(struct aa_ns *root,
+				       struct aa_profile *profile)
+{
+	struct aa_profile *next = __next_profile(profile);
+	if (next)
+		return next;
+
+	/* finished all profiles in namespace move to next namespace */
+	return __first_profile(root, __next_ns(root, profile->ns));
+}
+
+/**
+ * p_start - start a depth first traversal of profile tree
+ * @f: seq_file to fill
+ * @pos: current position
+ *
+ * Returns: first profile under current namespace or NULL if none found
+ *
+ * acquires first ns->lock
+ */
+static void *p_start(struct seq_file *f, loff_t *pos)
+{
+	struct aa_profile *profile = NULL;
+	struct aa_ns *root = aa_get_current_ns();
+	loff_t l = *pos;
+	f->private = root;
+
+	/* find the first profile */
+	mutex_lock_nested(&root->lock, root->level);
+	profile = __first_profile(root, root);
+
+	/* skip to position */
+	for (; profile && l > 0; l--)
+		profile = next_profile(root, profile);
+
+	return profile;
+}
+
+/**
+ * p_next - read the next profile entry
+ * @f: seq_file to fill
+ * @p: profile previously returned
+ * @pos: current position
+ *
+ * Returns: next profile after @p or NULL if none
+ *
+ * may acquire/release locks in namespace tree as necessary
+ */
+static void *p_next(struct seq_file *f, void *p, loff_t *pos)
+{
+	struct aa_profile *profile = p;
+	struct aa_ns *ns = f->private;
+	(*pos)++;
+
+	return next_profile(ns, profile);
+}
+
+/**
+ * p_stop - stop depth first traversal
+ * @f: seq_file we are filling
+ * @p: the last profile writen
+ *
+ * Release all locking done by p_start/p_next on namespace tree
+ */
+static void p_stop(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = p;
+	struct aa_ns *root = f->private, *ns;
+
+	if (profile) {
+		for (ns = profile->ns; ns && ns != root; ns = ns->parent)
+			mutex_unlock(&ns->lock);
+	}
+	mutex_unlock(&root->lock);
+	aa_put_ns(root);
+}
+
+/**
+ * seq_show_profile - show a profile entry
+ * @f: seq_file to file
+ * @p: current position (profile)    (NOT NULL)
+ *
+ * Returns: error on failure
+ */
+static int seq_show_profile(struct seq_file *f, void *p)
+{
+	struct aa_profile *profile = (struct aa_profile *)p;
+	struct aa_ns *root = f->private;
+
+	aa_label_seq_xprint(f, root, &profile->label,
+			    FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
+	seq_putc(f, '\n');
+
+	return 0;
+}
+
+static const struct seq_operations aa_sfs_profiles_op = {
+	.start = p_start,
+	.next = p_next,
+	.stop = p_stop,
+	.show = seq_show_profile,
+};
+
+static int profiles_open(struct inode *inode, struct file *file)
+{
+	if (!aa_current_policy_view_capable(NULL))
+		return -EACCES;
+
+	return seq_open(file, &aa_sfs_profiles_op);
+}
+
+static int profiles_release(struct inode *inode, struct file *file)
+{
+	return seq_release(inode, file);
+}
+
+static const struct file_operations aa_sfs_profiles_fops = {
+	.open = profiles_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = profiles_release,
+};
+
+
+/** Base file system setup **/
+static struct aa_sfs_entry aa_sfs_entry_file[] = {
+	AA_SFS_FILE_STRING("mask",
+			   "create read write exec append mmap_exec link lock"),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
+	AA_SFS_FILE_STRING("mask", "read trace"),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_signal[] = {
+	AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_attach[] = {
+	AA_SFS_FILE_BOOLEAN("xattr", 1),
+	{ }
+};
+static struct aa_sfs_entry aa_sfs_entry_domain[] = {
+	AA_SFS_FILE_BOOLEAN("change_hat",	1),
+	AA_SFS_FILE_BOOLEAN("change_hatv",	1),
+	AA_SFS_FILE_BOOLEAN("change_onexec",	1),
+	AA_SFS_FILE_BOOLEAN("change_profile",	1),
+	AA_SFS_FILE_BOOLEAN("stack",		1),
+	AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap",	1),
+	AA_SFS_FILE_BOOLEAN("post_nnp_subset",	1),
+	AA_SFS_FILE_BOOLEAN("computed_longest_left",	1),
+	AA_SFS_DIR("attach_conditions",		aa_sfs_entry_attach),
+	AA_SFS_FILE_STRING("version", "1.2"),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_versions[] = {
+	AA_SFS_FILE_BOOLEAN("v5",	1),
+	AA_SFS_FILE_BOOLEAN("v6",	1),
+	AA_SFS_FILE_BOOLEAN("v7",	1),
+	AA_SFS_FILE_BOOLEAN("v8",	1),
+	AA_SFS_FILE_BOOLEAN("v9",	1),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_policy[] = {
+	AA_SFS_DIR("versions",			aa_sfs_entry_versions),
+	AA_SFS_FILE_BOOLEAN("set_load",		1),
+	/* number of out of band transitions supported */
+	AA_SFS_FILE_U64("outofband",		MAX_OOB_SUPPORTED),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_mount[] = {
+	AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
+	AA_SFS_FILE_STRING("move_mount", "detached"),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_ns[] = {
+	AA_SFS_FILE_BOOLEAN("profile",		1),
+	AA_SFS_FILE_BOOLEAN("pivot_root",	0),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
+	AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
+	AA_SFS_FILE_BOOLEAN("data",		1),
+	AA_SFS_FILE_BOOLEAN("multi_transaction",	1),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_query[] = {
+	AA_SFS_DIR("label",			aa_sfs_entry_query_label),
+	{ }
+};
+static struct aa_sfs_entry aa_sfs_entry_features[] = {
+	AA_SFS_DIR("policy",			aa_sfs_entry_policy),
+	AA_SFS_DIR("domain",			aa_sfs_entry_domain),
+	AA_SFS_DIR("file",			aa_sfs_entry_file),
+	AA_SFS_DIR("network_v8",		aa_sfs_entry_network),
+	AA_SFS_DIR("mount",			aa_sfs_entry_mount),
+	AA_SFS_DIR("namespaces",		aa_sfs_entry_ns),
+	AA_SFS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
+	AA_SFS_DIR("rlimit",			aa_sfs_entry_rlimit),
+	AA_SFS_DIR("caps",			aa_sfs_entry_caps),
+	AA_SFS_DIR("ptrace",			aa_sfs_entry_ptrace),
+	AA_SFS_DIR("signal",			aa_sfs_entry_signal),
+	AA_SFS_DIR("query",			aa_sfs_entry_query),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
+	AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
+	AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
+	AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
+	AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
+	AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
+	AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
+	AA_SFS_FILE_FOPS("raw_data_compression_level_min", 0444, &seq_ns_compress_min_fops),
+	AA_SFS_FILE_FOPS("raw_data_compression_level_max", 0444, &seq_ns_compress_max_fops),
+	AA_SFS_DIR("features", aa_sfs_entry_features),
+	{ }
+};
+
+static struct aa_sfs_entry aa_sfs_entry =
+	AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
+
+/**
+ * entry_create_file - create a file entry in the apparmor securityfs
+ * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use entry_remove_file to remove entries created with this fn.
+ */
+static int __init entry_create_file(struct aa_sfs_entry *fs_file,
+				    struct dentry *parent)
+{
+	int error = 0;
+
+	fs_file->dentry = securityfs_create_file(fs_file->name,
+						 S_IFREG | fs_file->mode,
+						 parent, fs_file,
+						 fs_file->file_ops);
+	if (IS_ERR(fs_file->dentry)) {
+		error = PTR_ERR(fs_file->dentry);
+		fs_file->dentry = NULL;
+	}
+	return error;
+}
+
+static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
+/**
+ * entry_create_dir - recursively create a directory entry in the securityfs
+ * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
+ * @parent: the parent dentry in the securityfs
+ *
+ * Use entry_remove_dir to remove entries created with this fn.
+ */
+static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
+				   struct dentry *parent)
+{
+	struct aa_sfs_entry *fs_file;
+	struct dentry *dir;
+	int error;
+
+	dir = securityfs_create_dir(fs_dir->name, parent);
+	if (IS_ERR(dir))
+		return PTR_ERR(dir);
+	fs_dir->dentry = dir;
+
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
+		if (fs_file->v_type == AA_SFS_TYPE_DIR)
+			error = entry_create_dir(fs_file, fs_dir->dentry);
+		else
+			error = entry_create_file(fs_file, fs_dir->dentry);
+		if (error)
+			goto failed;
+	}
+
+	return 0;
+
+failed:
+	entry_remove_dir(fs_dir);
+
+	return error;
+}
+
+/**
+ * entry_remove_file - drop a single file entry in the apparmor securityfs
+ * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
+ */
+static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
+{
+	if (!fs_file->dentry)
+		return;
+
+	securityfs_remove(fs_file->dentry);
+	fs_file->dentry = NULL;
+}
+
+/**
+ * entry_remove_dir - recursively drop a directory entry from the securityfs
+ * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
+ */
+static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
+{
+	struct aa_sfs_entry *fs_file;
+
+	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
+		if (fs_file->v_type == AA_SFS_TYPE_DIR)
+			entry_remove_dir(fs_file);
+		else
+			entry_remove_file(fs_file);
+	}
+
+	entry_remove_file(fs_dir);
+}
+
+/**
+ * aa_destroy_aafs - cleanup and free aafs
+ *
+ * releases dentries allocated by aa_create_aafs
+ */
+void __init aa_destroy_aafs(void)
+{
+	entry_remove_dir(&aa_sfs_entry);
+}
+
+
+#define NULL_FILE_NAME ".null"
+struct path aa_null;
+
+static int aa_mk_null_file(struct dentry *parent)
+{
+	struct vfsmount *mount = NULL;
+	struct dentry *dentry;
+	struct inode *inode;
+	int count = 0;
+	int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
+
+	if (error)
+		return error;
+
+	inode_lock(d_inode(parent));
+	dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
+	if (IS_ERR(dentry)) {
+		error = PTR_ERR(dentry);
+		goto out;
+	}
+	inode = new_inode(parent->d_inode->i_sb);
+	if (!inode) {
+		error = -ENOMEM;
+		goto out1;
+	}
+
+	inode->i_ino = get_next_ino();
+	inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
+	inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
+	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
+			   MKDEV(MEM_MAJOR, 3));
+	d_instantiate(dentry, inode);
+	aa_null.dentry = dget(dentry);
+	aa_null.mnt = mntget(mount);
+
+	error = 0;
+
+out1:
+	dput(dentry);
+out:
+	inode_unlock(d_inode(parent));
+	simple_release_fs(&mount, &count);
+	return error;
+}
+
+
+
+static const char *policy_get_link(struct dentry *dentry,
+				   struct inode *inode,
+				   struct delayed_call *done)
+{
+	struct aa_ns *ns;
+	struct path path;
+	int error;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	ns = aa_get_current_ns();
+	path.mnt = mntget(aafs_mnt);
+	path.dentry = dget(ns_dir(ns));
+	error = nd_jump_link(&path);
+	aa_put_ns(ns);
+
+	return ERR_PTR(error);
+}
+
+static int policy_readlink(struct dentry *dentry, char __user *buffer,
+			   int buflen)
+{
+	char name[32];
+	int res;
+
+	res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
+		       d_inode(dentry)->i_ino);
+	if (res > 0 && res < sizeof(name))
+		res = readlink_copy(buffer, buflen, name);
+	else
+		res = -ENOENT;
+
+	return res;
+}
+
+static const struct inode_operations policy_link_iops = {
+	.readlink	= policy_readlink,
+	.get_link	= policy_get_link,
+};
+
+
+/**
+ * aa_create_aafs - create the apparmor security filesystem
+ *
+ * dentries created here are released by aa_destroy_aafs
+ *
+ * Returns: error on failure
+ */
+static int __init aa_create_aafs(void)
+{
+	struct dentry *dent;
+	int error;
+
+	if (!apparmor_initialized)
+		return 0;
+
+	if (aa_sfs_entry.dentry) {
+		AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
+		return -EEXIST;
+	}
+
+	/* setup apparmorfs used to virtualize policy/ */
+	aafs_mnt = kern_mount(&aafs_ops);
+	if (IS_ERR(aafs_mnt))
+		panic("can't set apparmorfs up\n");
+	aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
+
+	/* Populate fs tree. */
+	error = entry_create_dir(&aa_sfs_entry, NULL);
+	if (error)
+		goto error;
+
+	dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
+				      NULL, &aa_fs_profile_load);
+	if (IS_ERR(dent))
+		goto dent_error;
+	ns_subload(root_ns) = dent;
+
+	dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
+				      NULL, &aa_fs_profile_replace);
+	if (IS_ERR(dent))
+		goto dent_error;
+	ns_subreplace(root_ns) = dent;
+
+	dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
+				      NULL, &aa_fs_profile_remove);
+	if (IS_ERR(dent))
+		goto dent_error;
+	ns_subremove(root_ns) = dent;
+
+	dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
+				      NULL, &aa_fs_ns_revision_fops);
+	if (IS_ERR(dent))
+		goto dent_error;
+	ns_subrevision(root_ns) = dent;
+
+	/* policy tree referenced by magic policy symlink */
+	mutex_lock_nested(&root_ns->lock, root_ns->level);
+	error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
+				aafs_mnt->mnt_root);
+	mutex_unlock(&root_ns->lock);
+	if (error)
+		goto error;
+
+	/* magic symlink similar to nsfs redirects based on task policy */
+	dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
+					 NULL, &policy_link_iops);
+	if (IS_ERR(dent))
+		goto dent_error;
+
+	error = aa_mk_null_file(aa_sfs_entry.dentry);
+	if (error)
+		goto error;
+
+	/* TODO: add default profile to apparmorfs */
+
+	/* Report that AppArmor fs is enabled */
+	aa_info_message("AppArmor Filesystem Enabled");
+	return 0;
+
+dent_error:
+	error = PTR_ERR(dent);
+error:
+	aa_destroy_aafs();
+	AA_ERROR("Error creating AppArmor securityfs\n");
+	return error;
+}
+
+fs_initcall(aa_create_aafs);
-- 
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