Orange Pi5 kernel

// 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/zlib.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"
 
/*
 * 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;
};
 
#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;
}
 
/**
 * aa_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->i_ctime = current_time(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)) {
<------><------>kvfree(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(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(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_perms tmp = { };
<------>struct aa_dfa *dfa;
<------>unsigned int state = 0;
 
<------>if (profile_unconfined(profile))
<------><------>return;
<------>if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
<------><------>dfa = profile->file.dfa;
<------><------>state = aa_dfa_match_len(dfa, profile->file.start,
<------><------><------><------><------> match_str + 1, match_len - 1);
<------><------>if (state) {
<------><------><------>struct path_cond cond = { };
 
<------><------><------>tmp = aa_compute_fperms(dfa, state, &cond);
<------><------>}
<------>} else if (profile->policy.dfa) {
<------><------>if (!PROFILE_MEDIATES(profile, *match_str))
<------><------><------>return;	/* no change to current perms */
<------><------>dfa = profile->policy.dfa;
<------><------>state = aa_dfa_match_len(dfa, profile->policy.start[0],
<------><------><------><------><------> match_str, match_len);
<------><------>if (state)
<------><------><------>aa_compute_perms(dfa, state, &tmp);
<------>}
<------>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))
/* TODO: replace with per file lock */
static DEFINE_SPINLOCK(multi_transaction_lock);
 
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(&multi_transaction_lock);
<------>old = (struct multi_transaction *) file->private_data;
<------>file->private_data = new;
<------>spin_unlock(&multi_transaction_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))
<------><------>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(&multi_transaction_lock);
<------>t = get_multi_transaction(file->private_data);
<------>spin_unlock(&multi_transaction_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)
<------><------>seq_printf(seq, "%s\n", profile->attach);
<------>else if (profile->xmatch)
<------><------>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;
}
 
SEQ_NS_FOPS(stacked);
SEQ_NS_FOPS(nsstacked);
SEQ_NS_FOPS(level);
SEQ_NS_FOPS(name);
 
 
/* policy/raw_data/ * file ops */
 
#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 deflate_decompress(char *src, size_t slen, char *dst, size_t dlen)
{
<------>int error;
<------>struct z_stream_s strm;
 
<------>if (aa_g_rawdata_compression_level == 0) {
<------><------>if (dlen < slen)
<------><------><------>return -EINVAL;
<------><------>memcpy(dst, src, slen);
<------><------>return 0;
<------>}
 
<------>memset(&strm, 0, sizeof(strm));
 
<------>strm.workspace = kvzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
<------>if (!strm.workspace)
<------><------>return -ENOMEM;
 
<------>strm.next_in = src;
<------>strm.avail_in = slen;
 
<------>error = zlib_inflateInit(&strm);
<------>if (error != Z_OK) {
<------><------>error = -ENOMEM;
<------><------>goto fail_inflate_init;
<------>}
 
<------>strm.next_out = dst;
<------>strm.avail_out = dlen;
 
<------>error = zlib_inflate(&strm, Z_FINISH);
<------>if (error != Z_STREAM_END)
<------><------>error = -EINVAL;
<------>else
<------><------>error = 0;
 
<------>zlib_inflateEnd(&strm);
fail_inflate_init:
<------>kvfree(strm.workspace);
<------>return error;
}
 
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 (!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 = deflate_decompress(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);
}
 
/** 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])
<------><------><------>new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_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;
}
 
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,
};
 
 
/*
 * 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;
<------>}
 
<------>if (profile->rawdata) {
<------><------>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;
<------>}
 
<------>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 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(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(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;
}
 
 
#define list_entry_is_head(pos, head, member) (&pos->member == (head))
 
/**
 * __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
 * @profile: 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 (!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),
<------>{ }
};
 
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"),
<------>{ }
};
 
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_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->i_ctime = current_time(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);