tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * security/tomoyo/common.c
3 *
4 * Securityfs interface for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9#include <linux/security.h>
10#include "common.h"
11
12/**
13 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
14 *
15 * @inode: Pointer to "struct inode".
16 * @file: Pointer to "struct file".
17 *
18 * Returns 0 on success, negative value otherwise.
19 */
20static int tomoyo_open(struct inode *inode, struct file *file)
21{
22 const int key = ((u8 *) file->f_path.dentry->d_inode->i_private)
23 - ((u8 *) NULL);
24 return tomoyo_open_control(key, file);
25}
26
27/**
28 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
29 *
30 * @inode: Pointer to "struct inode".
31 * @file: Pointer to "struct file".
32 *
33 * Returns 0 on success, negative value otherwise.
34 */
35static int tomoyo_release(struct inode *inode, struct file *file)
36{
37 return tomoyo_close_control(file);
38}
39
40/**
41 * tomoyo_poll - poll() for /proc/ccs/ interface.
42 *
43 * @file: Pointer to "struct file".
44 * @wait: Pointer to "poll_table".
45 *
46 * Returns 0 on success, negative value otherwise.
47 */
48static unsigned int tomoyo_poll(struct file *file, poll_table *wait)
49{
50 return tomoyo_poll_control(file, wait);
51}
52
53/**
54 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
55 *
56 * @file: Pointer to "struct file".
57 * @buf: Pointer to buffer.
58 * @count: Size of @buf.
59 * @ppos: Unused.
60 *
61 * Returns bytes read on success, negative value otherwise.
62 */
63static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
64 loff_t *ppos)
65{
66 return tomoyo_read_control(file, buf, count);
67}
68
69/**
70 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
71 *
72 * @file: Pointer to "struct file".
73 * @buf: Pointer to buffer.
74 * @count: Size of @buf.
75 * @ppos: Unused.
76 *
77 * Returns @count on success, negative value otherwise.
78 */
79static ssize_t tomoyo_write(struct file *file, const char __user *buf,
80 size_t count, loff_t *ppos)
81{
82 return tomoyo_write_control(file, buf, count);
83}
84
85/*
86 * tomoyo_operations is a "struct file_operations" which is used for handling
87 * /sys/kernel/security/tomoyo/ interface.
88 *
89 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
90 * See tomoyo_io_buffer for internals.
91 */
92static const struct file_operations tomoyo_operations = {
93 .open = tomoyo_open,
94 .release = tomoyo_release,
95 .poll = tomoyo_poll,
96 .read = tomoyo_read,
97 .write = tomoyo_write,
98 .llseek = noop_llseek,
99};
100
101/**
102 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
103 *
104 * @name: The name of the interface file.
105 * @mode: The permission of the interface file.
106 * @parent: The parent directory.
107 * @key: Type of interface.
108 *
109 * Returns nothing.
110 */
111static void __init tomoyo_create_entry(const char *name, const mode_t mode,
112 struct dentry *parent, const u8 key)
113{
114 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
115 &tomoyo_operations);
116}
117
118/**
119 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
120 *
121 * Returns 0.
122 */
123static int __init tomoyo_initerface_init(void)
124{
125 struct dentry *tomoyo_dir;
126
127 /* Don't create securityfs entries unless registered. */
128 if (current_cred()->security != &tomoyo_kernel_domain)
129 return 0;
130
131 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
132 tomoyo_create_entry("query", 0600, tomoyo_dir,
133 TOMOYO_QUERY);
134 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
135 TOMOYO_DOMAINPOLICY);
136 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
137 TOMOYO_EXCEPTIONPOLICY);
138 tomoyo_create_entry("self_domain", 0400, tomoyo_dir,
139 TOMOYO_SELFDOMAIN);
140 tomoyo_create_entry(".domain_status", 0600, tomoyo_dir,
141 TOMOYO_DOMAIN_STATUS);
142 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
143 TOMOYO_PROCESS_STATUS);
144 tomoyo_create_entry("meminfo", 0600, tomoyo_dir,
145 TOMOYO_MEMINFO);
146 tomoyo_create_entry("profile", 0600, tomoyo_dir,
147 TOMOYO_PROFILE);
148 tomoyo_create_entry("manager", 0600, tomoyo_dir,
149 TOMOYO_MANAGER);
150 tomoyo_create_entry("version", 0400, tomoyo_dir,
151 TOMOYO_VERSION);
152 return 0;
153}
154
155fs_initcall(tomoyo_initerface_init);