media: cpia2_usb: drop bogus interface-release call
[linux/fpc-iii.git] / security / tomoyo / securityfs_if.c
blob1d3d7e7a1f055a187aac486506ca3d13cba7da20
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * security/tomoyo/securityfs_if.c
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
8 #include <linux/security.h>
9 #include "common.h"
11 /**
12 * tomoyo_check_task_acl - Check permission for task operation.
14 * @r: Pointer to "struct tomoyo_request_info".
15 * @ptr: Pointer to "struct tomoyo_acl_info".
17 * Returns true if granted, false otherwise.
19 static bool tomoyo_check_task_acl(struct tomoyo_request_info *r,
20 const struct tomoyo_acl_info *ptr)
22 const struct tomoyo_task_acl *acl = container_of(ptr, typeof(*acl),
23 head);
24 return !tomoyo_pathcmp(r->param.task.domainname, acl->domainname);
27 /**
28 * tomoyo_write_self - write() for /sys/kernel/security/tomoyo/self_domain interface.
30 * @file: Pointer to "struct file".
31 * @buf: Domainname to transit to.
32 * @count: Size of @buf.
33 * @ppos: Unused.
35 * Returns @count on success, negative value otherwise.
37 * If domain transition was permitted but the domain transition failed, this
38 * function returns error rather than terminating current thread with SIGKILL.
40 static ssize_t tomoyo_write_self(struct file *file, const char __user *buf,
41 size_t count, loff_t *ppos)
43 char *data;
44 int error;
45 if (!count || count >= TOMOYO_EXEC_TMPSIZE - 10)
46 return -ENOMEM;
47 data = memdup_user_nul(buf, count);
48 if (IS_ERR(data))
49 return PTR_ERR(data);
50 tomoyo_normalize_line(data);
51 if (tomoyo_correct_domain(data)) {
52 const int idx = tomoyo_read_lock();
53 struct tomoyo_path_info name;
54 struct tomoyo_request_info r;
55 name.name = data;
56 tomoyo_fill_path_info(&name);
57 /* Check "task manual_domain_transition" permission. */
58 tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE);
59 r.param_type = TOMOYO_TYPE_MANUAL_TASK_ACL;
60 r.param.task.domainname = &name;
61 tomoyo_check_acl(&r, tomoyo_check_task_acl);
62 if (!r.granted)
63 error = -EPERM;
64 else {
65 struct tomoyo_domain_info *new_domain =
66 tomoyo_assign_domain(data, true);
67 if (!new_domain) {
68 error = -ENOENT;
69 } else {
70 struct cred *cred = prepare_creds();
71 if (!cred) {
72 error = -ENOMEM;
73 } else {
74 struct tomoyo_domain_info *old_domain =
75 cred->security;
76 cred->security = new_domain;
77 atomic_inc(&new_domain->users);
78 atomic_dec(&old_domain->users);
79 commit_creds(cred);
80 error = 0;
84 tomoyo_read_unlock(idx);
85 } else
86 error = -EINVAL;
87 kfree(data);
88 return error ? error : count;
91 /**
92 * tomoyo_read_self - read() for /sys/kernel/security/tomoyo/self_domain interface.
94 * @file: Pointer to "struct file".
95 * @buf: Domainname which current thread belongs to.
96 * @count: Size of @buf.
97 * @ppos: Bytes read by now.
99 * Returns read size on success, negative value otherwise.
101 static ssize_t tomoyo_read_self(struct file *file, char __user *buf,
102 size_t count, loff_t *ppos)
104 const char *domain = tomoyo_domain()->domainname->name;
105 loff_t len = strlen(domain);
106 loff_t pos = *ppos;
107 if (pos >= len || !count)
108 return 0;
109 len -= pos;
110 if (count < len)
111 len = count;
112 if (copy_to_user(buf, domain + pos, len))
113 return -EFAULT;
114 *ppos += len;
115 return len;
118 /* Operations for /sys/kernel/security/tomoyo/self_domain interface. */
119 static const struct file_operations tomoyo_self_operations = {
120 .write = tomoyo_write_self,
121 .read = tomoyo_read_self,
125 * tomoyo_open - open() for /sys/kernel/security/tomoyo/ interface.
127 * @inode: Pointer to "struct inode".
128 * @file: Pointer to "struct file".
130 * Returns 0 on success, negative value otherwise.
132 static int tomoyo_open(struct inode *inode, struct file *file)
134 const int key = ((u8 *) file_inode(file)->i_private)
135 - ((u8 *) NULL);
136 return tomoyo_open_control(key, file);
140 * tomoyo_release - close() for /sys/kernel/security/tomoyo/ interface.
142 * @file: Pointer to "struct file".
145 static int tomoyo_release(struct inode *inode, struct file *file)
147 tomoyo_close_control(file->private_data);
148 return 0;
152 * tomoyo_poll - poll() for /sys/kernel/security/tomoyo/ interface.
154 * @file: Pointer to "struct file".
155 * @wait: Pointer to "poll_table". Maybe NULL.
157 * Returns EPOLLIN | EPOLLRDNORM | EPOLLOUT | EPOLLWRNORM if ready to read/write,
158 * EPOLLOUT | EPOLLWRNORM otherwise.
160 static __poll_t tomoyo_poll(struct file *file, poll_table *wait)
162 return tomoyo_poll_control(file, wait);
166 * tomoyo_read - read() for /sys/kernel/security/tomoyo/ interface.
168 * @file: Pointer to "struct file".
169 * @buf: Pointer to buffer.
170 * @count: Size of @buf.
171 * @ppos: Unused.
173 * Returns bytes read on success, negative value otherwise.
175 static ssize_t tomoyo_read(struct file *file, char __user *buf, size_t count,
176 loff_t *ppos)
178 return tomoyo_read_control(file->private_data, buf, count);
182 * tomoyo_write - write() for /sys/kernel/security/tomoyo/ interface.
184 * @file: Pointer to "struct file".
185 * @buf: Pointer to buffer.
186 * @count: Size of @buf.
187 * @ppos: Unused.
189 * Returns @count on success, negative value otherwise.
191 static ssize_t tomoyo_write(struct file *file, const char __user *buf,
192 size_t count, loff_t *ppos)
194 return tomoyo_write_control(file->private_data, buf, count);
198 * tomoyo_operations is a "struct file_operations" which is used for handling
199 * /sys/kernel/security/tomoyo/ interface.
201 * Some files under /sys/kernel/security/tomoyo/ directory accept open(O_RDWR).
202 * See tomoyo_io_buffer for internals.
204 static const struct file_operations tomoyo_operations = {
205 .open = tomoyo_open,
206 .release = tomoyo_release,
207 .poll = tomoyo_poll,
208 .read = tomoyo_read,
209 .write = tomoyo_write,
210 .llseek = noop_llseek,
214 * tomoyo_create_entry - Create interface files under /sys/kernel/security/tomoyo/ directory.
216 * @name: The name of the interface file.
217 * @mode: The permission of the interface file.
218 * @parent: The parent directory.
219 * @key: Type of interface.
221 * Returns nothing.
223 static void __init tomoyo_create_entry(const char *name, const umode_t mode,
224 struct dentry *parent, const u8 key)
226 securityfs_create_file(name, mode, parent, ((u8 *) NULL) + key,
227 &tomoyo_operations);
231 * tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
233 * Returns 0.
235 static int __init tomoyo_initerface_init(void)
237 struct dentry *tomoyo_dir;
239 /* Don't create securityfs entries unless registered. */
240 if (current_cred()->security != &tomoyo_kernel_domain)
241 return 0;
243 tomoyo_dir = securityfs_create_dir("tomoyo", NULL);
244 tomoyo_create_entry("query", 0600, tomoyo_dir,
245 TOMOYO_QUERY);
246 tomoyo_create_entry("domain_policy", 0600, tomoyo_dir,
247 TOMOYO_DOMAINPOLICY);
248 tomoyo_create_entry("exception_policy", 0600, tomoyo_dir,
249 TOMOYO_EXCEPTIONPOLICY);
250 tomoyo_create_entry("audit", 0400, tomoyo_dir,
251 TOMOYO_AUDIT);
252 tomoyo_create_entry(".process_status", 0600, tomoyo_dir,
253 TOMOYO_PROCESS_STATUS);
254 tomoyo_create_entry("stat", 0644, tomoyo_dir,
255 TOMOYO_STAT);
256 tomoyo_create_entry("profile", 0600, tomoyo_dir,
257 TOMOYO_PROFILE);
258 tomoyo_create_entry("manager", 0600, tomoyo_dir,
259 TOMOYO_MANAGER);
260 tomoyo_create_entry("version", 0400, tomoyo_dir,
261 TOMOYO_VERSION);
262 securityfs_create_file("self_domain", 0666, tomoyo_dir, NULL,
263 &tomoyo_self_operations);
264 tomoyo_load_builtin_policy();
265 return 0;
268 fs_initcall(tomoyo_initerface_init);