2 * AppArmor security module
4 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/security.h>
16 #include <linux/vmalloc.h>
17 #include <linux/module.h>
18 #include <linux/seq_file.h>
19 #include <linux/uaccess.h>
20 #include <linux/namei.h>
22 #include "include/apparmor.h"
23 #include "include/apparmorfs.h"
24 #include "include/audit.h"
25 #include "include/context.h"
26 #include "include/policy.h"
29 * aa_simple_write_to_buffer - common routine for getting policy from user
30 * @op: operation doing the user buffer copy
31 * @userbuf: user buffer to copy data from (NOT NULL)
32 * @alloc_size: size of user buffer
33 * @copy_size: size of data to copy from user buffer
34 * @pos: position write is at in the file (NOT NULL)
36 * Returns: kernel buffer containing copy of user buffer data or an
39 static char *aa_simple_write_to_buffer(int op, const char __user *userbuf,
40 size_t alloc_size, size_t copy_size,
46 /* only writes from pos 0, that is complete writes */
47 return ERR_PTR(-ESPIPE);
50 * Don't allow profile load/replace/remove from profiles that don't
53 if (!aa_may_manage_policy(op))
54 return ERR_PTR(-EACCES);
56 /* freed by caller to simple_write_to_buffer */
57 data = kvmalloc(alloc_size);
59 return ERR_PTR(-ENOMEM);
61 if (copy_from_user(data, userbuf, copy_size)) {
63 return ERR_PTR(-EFAULT);
70 /* .load file hook fn to load policy */
71 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
77 data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos);
79 error = PTR_ERR(data);
81 error = aa_replace_profiles(data, size, PROF_ADD);
88 static const struct file_operations aa_fs_profile_load = {
89 .write = profile_load,
90 .llseek = default_llseek,
93 /* .replace file hook fn to load and/or replace policy */
94 static ssize_t profile_replace(struct file *f, const char __user *buf,
95 size_t size, loff_t *pos)
100 data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos);
101 error = PTR_ERR(data);
103 error = aa_replace_profiles(data, size, PROF_REPLACE);
110 static const struct file_operations aa_fs_profile_replace = {
111 .write = profile_replace,
112 .llseek = default_llseek,
115 /* .remove file hook fn to remove loaded policy */
116 static ssize_t profile_remove(struct file *f, const char __user *buf,
117 size_t size, loff_t *pos)
123 * aa_remove_profile needs a null terminated string so 1 extra
124 * byte is allocated and the copied data is null terminated.
126 data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos);
128 error = PTR_ERR(data);
131 error = aa_remove_profiles(data, size);
138 static const struct file_operations aa_fs_profile_remove = {
139 .write = profile_remove,
140 .llseek = default_llseek,
143 /** Base file system setup **/
145 static struct dentry *aa_fs_dentry __initdata;
147 static void __init aafs_remove(const char *name)
149 struct dentry *dentry;
151 dentry = lookup_one_len(name, aa_fs_dentry, strlen(name));
152 if (!IS_ERR(dentry)) {
153 securityfs_remove(dentry);
159 * aafs_create - create an entry in the apparmor filesystem
160 * @name: name of the entry (NOT NULL)
161 * @mask: file permission mask of the file
162 * @fops: file operations for the file (NOT NULL)
164 * Used aafs_remove to remove entries created with this fn.
166 static int __init aafs_create(const char *name, int mask,
167 const struct file_operations *fops)
169 struct dentry *dentry;
171 dentry = securityfs_create_file(name, S_IFREG | mask, aa_fs_dentry,
174 return IS_ERR(dentry) ? PTR_ERR(dentry) : 0;
178 * aa_destroy_aafs - cleanup and free aafs
180 * releases dentries allocated by aa_create_aafs
182 void __init aa_destroy_aafs(void)
185 aafs_remove(".remove");
186 aafs_remove(".replace");
187 aafs_remove(".load");
189 securityfs_remove(aa_fs_dentry);
195 * aa_create_aafs - create the apparmor security filesystem
197 * dentries created here are released by aa_destroy_aafs
199 * Returns: error on failure
201 int __init aa_create_aafs(void)
205 if (!apparmor_initialized)
209 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
213 aa_fs_dentry = securityfs_create_dir("apparmor", NULL);
214 if (IS_ERR(aa_fs_dentry)) {
215 error = PTR_ERR(aa_fs_dentry);
220 error = aafs_create(".load", 0640, &aa_fs_profile_load);
223 error = aafs_create(".replace", 0640, &aa_fs_profile_replace);
226 error = aafs_create(".remove", 0640, &aa_fs_profile_remove);
230 /* TODO: add support for apparmorfs_null and apparmorfs_mnt */
232 /* Report that AppArmor fs is enabled */
233 aa_info_message("AppArmor Filesystem Enabled");
238 AA_ERROR("Error creating AppArmor securityfs\n");
242 fs_initcall(aa_create_aafs);