1/*
2 * linux/fs/hfsplus/xattr_trusted.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Handler for storing security labels as extended attributes.
7 */
8
9#include <linux/security.h>
10#include <linux/nls.h>
11
12#include "hfsplus_fs.h"
13#include "xattr.h"
14#include "acl.h"
15
16static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
17					void *buffer, size_t size, int type)
18{
19	return hfsplus_getxattr(dentry, name, buffer, size,
20				XATTR_SECURITY_PREFIX,
21				XATTR_SECURITY_PREFIX_LEN);
22}
23
24static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
25		const void *buffer, size_t size, int flags, int type)
26{
27	return hfsplus_setxattr(dentry, name, buffer, size, flags,
28				XATTR_SECURITY_PREFIX,
29				XATTR_SECURITY_PREFIX_LEN);
30}
31
32static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
33		size_t list_size, const char *name, size_t name_len, int type)
34{
35	/*
36	 * This method is not used.
37	 * It is used hfsplus_listxattr() instead of generic_listxattr().
38	 */
39	return -EOPNOTSUPP;
40}
41
42static int hfsplus_initxattrs(struct inode *inode,
43				const struct xattr *xattr_array,
44				void *fs_info)
45{
46	const struct xattr *xattr;
47	char *xattr_name;
48	int err = 0;
49
50	xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
51		GFP_KERNEL);
52	if (!xattr_name)
53		return -ENOMEM;
54	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
55
56		if (!strcmp(xattr->name, ""))
57			continue;
58
59		strcpy(xattr_name, XATTR_SECURITY_PREFIX);
60		strcpy(xattr_name +
61			XATTR_SECURITY_PREFIX_LEN, xattr->name);
62		memset(xattr_name +
63			XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
64
65		err = __hfsplus_setxattr(inode, xattr_name,
66					xattr->value, xattr->value_len, 0);
67		if (err)
68			break;
69	}
70	kfree(xattr_name);
71	return err;
72}
73
74int hfsplus_init_security(struct inode *inode, struct inode *dir,
75				const struct qstr *qstr)
76{
77	return security_inode_init_security(inode, dir, qstr,
78					&hfsplus_initxattrs, NULL);
79}
80
81int hfsplus_init_inode_security(struct inode *inode,
82						struct inode *dir,
83						const struct qstr *qstr)
84{
85	int err;
86
87	err = hfsplus_init_posix_acl(inode, dir);
88	if (!err)
89		err = hfsplus_init_security(inode, dir, qstr);
90	return err;
91}
92
93const struct xattr_handler hfsplus_xattr_security_handler = {
94	.prefix	= XATTR_SECURITY_PREFIX,
95	.list	= hfsplus_security_listxattr,
96	.get	= hfsplus_security_getxattr,
97	.set	= hfsplus_security_setxattr,
98};
99