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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
Al Virof7699f22012-03-23 16:45:51 -04006#include "ext2.h"
Stephen Smalley10f47e62005-09-09 13:01:39 -07007#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include "xattr.h"
9
10static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000011ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
12 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070013{
Shen Fengf905f062008-07-25 01:46:15 -070014 const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 const size_t total_len = prefix_len + name_len + 1;
16
17 if (list && total_len <= list_size) {
18 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
19 memcpy(list+prefix_len, name, name_len);
20 list[prefix_len + name_len] = '\0';
21 }
22 return total_len;
23}
24
25static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000026ext2_xattr_security_get(struct dentry *dentry, const char *name,
27 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028{
29 if (strcmp(name, "") == 0)
30 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000031 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 buffer, size);
33}
34
35static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000036ext2_xattr_security_set(struct dentry *dentry, const char *name,
37 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
39 if (strcmp(name, "") == 0)
40 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000041 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 value, size, flags);
43}
44
Rashika Kheria17cd48e2014-02-09 18:34:10 +053045static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
46 void *fs_info)
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040047{
48 const struct xattr *xattr;
49 int err = 0;
50
51 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
52 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
53 xattr->name, xattr->value,
54 xattr->value_len, 0);
55 if (err < 0)
56 break;
57 }
58 return err;
59}
60
Stephen Smalley10f47e62005-09-09 13:01:39 -070061int
Eric Paris2a7dba32011-02-01 11:05:39 -050062ext2_init_security(struct inode *inode, struct inode *dir,
63 const struct qstr *qstr)
Stephen Smalley10f47e62005-09-09 13:01:39 -070064{
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040065 return security_inode_init_security(inode, dir, qstr,
66 &ext2_initxattrs, NULL);
Stephen Smalley10f47e62005-09-09 13:01:39 -070067}
68
Stephen Hemminger749c72ef2010-05-13 17:53:16 -070069const struct xattr_handler ext2_xattr_security_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 .prefix = XATTR_SECURITY_PREFIX,
71 .list = ext2_xattr_security_list,
72 .get = ext2_xattr_security_get,
73 .set = ext2_xattr_security_set,
74};