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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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};