1/*
2 * linux/fs/ext3/xattr_security.c
3 * Handler for storing security labels as extended attributes.
4 */
5
6#include <linux/security.h>
7#include "ext3.h"
8#include "xattr.h"
9
10static size_t
11ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
12			 const char *name, size_t name_len, int type)
13{
14	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
15	const size_t total_len = prefix_len + name_len + 1;
16
17
18	if (list && total_len <= list_size) {
19		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
20		memcpy(list+prefix_len, name, name_len);
21		list[prefix_len + name_len] = '\0';
22	}
23	return total_len;
24}
25
26static int
27ext3_xattr_security_get(struct dentry *dentry, const char *name,
28		void *buffer, size_t size, int type)
29{
30	if (strcmp(name, "") == 0)
31		return -EINVAL;
32	return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
33			      name, buffer, size);
34}
35
36static int
37ext3_xattr_security_set(struct dentry *dentry, const char *name,
38		const void *value, size_t size, int flags, int type)
39{
40	if (strcmp(name, "") == 0)
41		return -EINVAL;
42	return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
43			      name, value, size, flags);
44}
45
46static int ext3_initxattrs(struct inode *inode,
47			   const struct xattr *xattr_array,
48			   void *fs_info)
49{
50	const struct xattr *xattr;
51	handle_t *handle = fs_info;
52	int err = 0;
53
54	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
55		err = ext3_xattr_set_handle(handle, inode,
56					    EXT3_XATTR_INDEX_SECURITY,
57					    xattr->name, xattr->value,
58					    xattr->value_len, 0);
59		if (err < 0)
60			break;
61	}
62	return err;
63}
64
65int
66ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
67		   const struct qstr *qstr)
68{
69	return security_inode_init_security(inode, dir, qstr,
70					    &ext3_initxattrs, handle);
71}
72
73const struct xattr_handler ext3_xattr_security_handler = {
74	.prefix	= XATTR_SECURITY_PREFIX,
75	.list	= ext3_xattr_security_list,
76	.get	= ext3_xattr_security_get,
77	.set	= ext3_xattr_security_set,
78};
79