1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
#include "reiserfs.h"
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include <linux/slab.h>
#include "xattr.h"
#include <linux/security.h>
#include <linux/uaccess.h>
static int
security_get(const struct xattr_handler *handler, struct dentry *dentry,
const char *name, void *buffer, size_t size)
{
if (IS_PRIVATE(d_inode(dentry)))
return -EPERM;
return reiserfs_xattr_get(d_inode(dentry),
xattr_full_name(handler, name),
buffer, size);
}
static int
security_set(const struct xattr_handler *handler, struct dentry *dentry,
const char *name, const void *buffer, size_t size, int flags)
{
if (IS_PRIVATE(d_inode(dentry)))
return -EPERM;
return reiserfs_xattr_set(d_inode(dentry),
xattr_full_name(handler, name),
buffer, size, flags);
}
static bool security_list(struct dentry *dentry)
{
return !IS_PRIVATE(d_inode(dentry));
}
/* Initializes the security context for a new inode and returns the number
* of blocks needed for the transaction. If successful, reiserfs_security
* must be released using reiserfs_security_free when the caller is done. */
int reiserfs_security_init(struct inode *dir, struct inode *inode,
const struct qstr *qstr,
struct reiserfs_security_handle *sec)
{
int blocks = 0;
int error;
sec->name = NULL;
/* Don't add selinux attributes on xattrs - they'll never get used */
if (IS_PRIVATE(dir))
return 0;
error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
&sec->value, &sec->length);
if (error) {
if (error == -EOPNOTSUPP)
error = 0;
sec->name = NULL;
sec->value = NULL;
sec->length = 0;
return error;
}
if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
blocks = reiserfs_xattr_jcreate_nblocks(inode) +
reiserfs_xattr_nblocks(inode, sec->length);
/* We don't want to count the directories twice if we have
* a default ACL. */
REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
}
return blocks;
}
int reiserfs_security_write(struct reiserfs_transaction_handle *th,
struct inode *inode,
struct reiserfs_security_handle *sec)
{
int error;
if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
return -EINVAL;
error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
sec->length, XATTR_CREATE);
if (error == -ENODATA || error == -EOPNOTSUPP)
error = 0;
return error;
}
void reiserfs_security_free(struct reiserfs_security_handle *sec)
{
kfree(sec->name);
kfree(sec->value);
sec->name = NULL;
sec->value = NULL;
}
const struct xattr_handler reiserfs_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = security_get,
.set = security_set,
.list = security_list,
};
|
