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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
6#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/string.h>
9#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/ext2_fs.h>
Stephen Smalley10f47e62005-09-09 13:01:39 -070011#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include "xattr.h"
13
14static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000015ext2_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
16 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017{
Shen Fengf905f062008-07-25 01:46:15 -070018 const int prefix_len = XATTR_SECURITY_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 const size_t total_len = prefix_len + name_len + 1;
20
21 if (list && total_len <= list_size) {
22 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
23 memcpy(list+prefix_len, name, name_len);
24 list[prefix_len + name_len] = '\0';
25 }
26 return total_len;
27}
28
29static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000030ext2_xattr_security_get(struct dentry *dentry, const char *name,
31 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070032{
33 if (strcmp(name, "") == 0)
34 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000035 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 buffer, size);
37}
38
39static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000040ext2_xattr_security_set(struct dentry *dentry, const char *name,
41 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 if (strcmp(name, "") == 0)
44 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000045 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_SECURITY, name,
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 value, size, flags);
47}
48
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040049int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
50 void *fs_info)
51{
52 const struct xattr *xattr;
53 int err = 0;
54
55 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
56 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
57 xattr->name, xattr->value,
58 xattr->value_len, 0);
59 if (err < 0)
60 break;
61 }
62 return err;
63}
64
Stephen Smalley10f47e62005-09-09 13:01:39 -070065int
Eric Paris2a7dba32011-02-01 11:05:39 -050066ext2_init_security(struct inode *inode, struct inode *dir,
67 const struct qstr *qstr)
Stephen Smalley10f47e62005-09-09 13:01:39 -070068{
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040069 return security_inode_init_security(inode, dir, qstr,
70 &ext2_initxattrs, NULL);
Stephen Smalley10f47e62005-09-09 13:01:39 -070071}
72
Stephen Hemminger749c72ef2010-05-13 17:53:16 -070073const struct xattr_handler ext2_xattr_security_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 .prefix = XATTR_SECURITY_PREFIX,
75 .list = ext2_xattr_security_list,
76 .get = ext2_xattr_security_get,
77 .set = ext2_xattr_security_set,
78};