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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/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};