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  • only in /netgear-R7000-V1.0.7.12_1.2.5/components/opensource/linux/linux-2.6.36/fs/reiserfs/
1#include <linux/reiserfs_fs.h>
2#include <linux/errno.h>
3#include <linux/fs.h>
4#include <linux/pagemap.h>
5#include <linux/xattr.h>
6#include <linux/slab.h>
7#include <linux/reiserfs_xattr.h>
8#include <linux/security.h>
9#include <asm/uaccess.h>
10
11static int
12security_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
13		int handler_flags)
14{
15	if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
16		return -EINVAL;
17
18	if (IS_PRIVATE(dentry->d_inode))
19		return -EPERM;
20
21	return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
22}
23
24static int
25security_set(struct dentry *dentry, const char *name, const void *buffer,
26	     size_t size, int flags, int handler_flags)
27{
28	if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
29		return -EINVAL;
30
31	if (IS_PRIVATE(dentry->d_inode))
32		return -EPERM;
33
34	return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
35}
36
37static size_t security_list(struct dentry *dentry, char *list, size_t list_len,
38			    const char *name, size_t namelen, int handler_flags)
39{
40	const size_t len = namelen + 1;
41
42	if (IS_PRIVATE(dentry->d_inode))
43		return 0;
44
45	if (list && len <= list_len) {
46		memcpy(list, name, namelen);
47		list[namelen] = '\0';
48	}
49
50	return len;
51}
52
53/* Initializes the security context for a new inode and returns the number
54 * of blocks needed for the transaction. If successful, reiserfs_security
55 * must be released using reiserfs_security_free when the caller is done. */
56int reiserfs_security_init(struct inode *dir, struct inode *inode,
57			   struct reiserfs_security_handle *sec)
58{
59	int blocks = 0;
60	int error;
61
62	sec->name = NULL;
63
64	/* Don't add selinux attributes on xattrs - they'll never get used */
65	if (IS_PRIVATE(dir))
66		return 0;
67
68	error = security_inode_init_security(inode, dir, &sec->name,
69					     &sec->value, &sec->length);
70	if (error) {
71		if (error == -EOPNOTSUPP)
72			error = 0;
73
74		sec->name = NULL;
75		sec->value = NULL;
76		sec->length = 0;
77		return error;
78	}
79
80	if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
81		blocks = reiserfs_xattr_jcreate_nblocks(inode) +
82			 reiserfs_xattr_nblocks(inode, sec->length);
83		/* We don't want to count the directories twice if we have
84		 * a default ACL. */
85		REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
86	}
87	return blocks;
88}
89
90int reiserfs_security_write(struct reiserfs_transaction_handle *th,
91			    struct inode *inode,
92			    struct reiserfs_security_handle *sec)
93{
94	int error;
95	if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
96		return -EINVAL;
97
98	error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
99					  sec->length, XATTR_CREATE);
100	if (error == -ENODATA || error == -EOPNOTSUPP)
101		error = 0;
102
103	return error;
104}
105
106void reiserfs_security_free(struct reiserfs_security_handle *sec)
107{
108	kfree(sec->name);
109	kfree(sec->value);
110	sec->name = NULL;
111	sec->value = NULL;
112}
113
114const struct xattr_handler reiserfs_xattr_security_handler = {
115	.prefix = XATTR_SECURITY_PREFIX,
116	.get = security_get,
117	.set = security_set,
118	.list = security_list,
119};
120