blob: c8155845ac0518e8665e122be57fcfe988a9fa56 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext2/xattr_security.c
3 * Handler for storing security labels as extended attributes.
4 */
5
6#include <linux/module.h>
7#include <linux/string.h>
8#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/ext2_fs.h>
Stephen Smalley10f47e62005-09-09 13:01:39 -070010#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include "xattr.h"
12
13static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000014ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
15 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070016{
Shen Fengf905f062008-07-25 01:46:15 -070017 const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 const size_t total_len = prefix_len + name_len + 1;
19
20 if (list && total_len <= list_size) {
21 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
22 memcpy(list+prefix_len, name, name_len);
23 list[prefix_len + name_len] = '\0';
24 }
25 return total_len;
26}
27
28static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000029ext2_xattr_security_get(struct dentry *dentry, const char *name,
30 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
32 if (strcmp(name, "") == 0)
33 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000034 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 buffer, size);
36}
37
38static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000039ext2_xattr_security_set(struct dentry *dentry, const char *name,
40 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 if (strcmp(name, "") == 0)
43 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000044 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 value, size, flags);
46}
47
Stephen Smalley10f47e62005-09-09 13:01:39 -070048int
49ext2_init_security(struct inode *inode, struct inode *dir)
50{
51 int err;
52 size_t len;
53 void *value;
54 char *name;
55
56 err = security_inode_init_security(inode, dir, &name, &value, &len);
57 if (err) {
58 if (err == -EOPNOTSUPP)
59 return 0;
60 return err;
61 }
62 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
63 name, value, len, 0);
64 kfree(name);
65 kfree(value);
66 return err;
67}
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069struct xattr_handler ext2_xattr_security_handler = {
70 .prefix = XATTR_SECURITY_PREFIX,
71 .list = ext2_xattr_security_list,
72 .get = ext2_xattr_security_get,
73 .set = ext2_xattr_security_set,
74};