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(dentry->d_inode, 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(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
43			      name, value, size, flags);
44}
45
46int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array,
47		    void *fs_info)
48{
49	const struct xattr *xattr;
50	handle_t *handle = fs_info;
51	int err = 0;
52
53	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
54		err = ext3_xattr_set_handle(handle, inode,
55					    EXT3_XATTR_INDEX_SECURITY,
56					    xattr->name, xattr->value,
57					    xattr->value_len, 0);
58		if (err < 0)
59			break;
60	}
61	return err;
62}
63
64int
65ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
66		   const struct qstr *qstr)
67{
68	return security_inode_init_security(inode, dir, qstr,
69					    &ext3_initxattrs, handle);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
70}
71
72const struct xattr_handler ext3_xattr_security_handler = {
73	.prefix	= XATTR_SECURITY_PREFIX,
74	.list	= ext3_xattr_security_list,
75	.get	= ext3_xattr_security_get,
76	.set	= ext3_xattr_security_set,
77};

 1/*
 2 * linux/fs/ext3/xattr_security.c
 3 * Handler for storing security labels as extended attributes.
 4 */
 5
 6#include <linux/module.h>
 7#include <linux/slab.h>
 8#include <linux/string.h>
 9#include <linux/fs.h>
10#include <linux/ext3_jbd.h>
11#include <linux/ext3_fs.h>
12#include <linux/security.h>
 
13#include "xattr.h"
14
15static size_t
16ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
17			 const char *name, size_t name_len, int type)
18{
19	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
20	const size_t total_len = prefix_len + name_len + 1;
21
22
23	if (list && total_len <= list_size) {
24		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
25		memcpy(list+prefix_len, name, name_len);
26		list[prefix_len + name_len] = '\0';
27	}
28	return total_len;
29}
30
31static int
32ext3_xattr_security_get(struct dentry *dentry, const char *name,
33		void *buffer, size_t size, int type)
34{
35	if (strcmp(name, "") == 0)
36		return -EINVAL;
37	return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
38			      name, buffer, size);
39}
40
41static int
42ext3_xattr_security_set(struct dentry *dentry, const char *name,
43		const void *value, size_t size, int flags, int type)
44{
45	if (strcmp(name, "") == 0)
46		return -EINVAL;
47	return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
48			      name, value, size, flags);
49}
50
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
51int
52ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
53		   const struct qstr *qstr)
54{
55	int err;
56	size_t len;
57	void *value;
58	char *name;
59
60	err = security_inode_init_security(inode, dir, qstr, &name, &value, &len);
61	if (err) {
62		if (err == -EOPNOTSUPP)
63			return 0;
64		return err;
65	}
66	err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
67				    name, value, len, 0);
68	kfree(name);
69	kfree(value);
70	return err;
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};