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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/xattr_security.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 * Handler for storing security labels as extended attributes.
4 */
5
Dave Kleikampac27a0e2006-10-11 01:20:50 -07006#include <linux/string.h>
7#include <linux/fs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -07008#include <linux/security.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09009#include <linux/slab.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040010#include "ext4_jbd2.h"
11#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070012#include "xattr.h"
13
14static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000015ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
16 const char *name, size_t name_len, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070017{
18 const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
19 const size_t total_len = prefix_len + name_len + 1;
20
21
22 if (list && total_len <= list_size) {
23 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
24 memcpy(list+prefix_len, name, name_len);
25 list[prefix_len + name_len] = '\0';
26 }
27 return total_len;
28}
29
30static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000031ext4_xattr_security_get(struct dentry *dentry, const char *name,
32 void *buffer, size_t size, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070033{
34 if (strcmp(name, "") == 0)
35 return -EINVAL;
David Howells2b0143b2015-03-17 22:25:59 +000036 return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
Christoph Hellwig431547b2009-11-13 09:52:56 +000037 name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070038}
39
40static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000041ext4_xattr_security_set(struct dentry *dentry, const char *name,
42 const void *value, size_t size, int flags, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043{
44 if (strcmp(name, "") == 0)
45 return -EINVAL;
David Howells2b0143b2015-03-17 22:25:59 +000046 return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
Christoph Hellwig431547b2009-11-13 09:52:56 +000047 name, value, size, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048}
49
Djalal Harouni176576d2012-01-04 22:32:12 -050050static int
51ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
52 void *fs_info)
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040053{
54 const struct xattr *xattr;
55 handle_t *handle = fs_info;
56 int err = 0;
57
58 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
59 err = ext4_xattr_set_handle(handle, inode,
60 EXT4_XATTR_INDEX_SECURITY,
61 xattr->name, xattr->value,
62 xattr->value_len, 0);
63 if (err < 0)
64 break;
65 }
66 return err;
67}
68
Dave Kleikampac27a0e2006-10-11 01:20:50 -070069int
Eric Paris2a7dba32011-02-01 11:05:39 -050070ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
71 const struct qstr *qstr)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070072{
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040073 return security_inode_init_security(inode, dir, qstr,
74 &ext4_initxattrs, handle);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070075}
76
Stephen Hemminger11e27522010-05-13 17:53:18 -070077const struct xattr_handler ext4_xattr_security_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070078 .prefix = XATTR_SECURITY_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070079 .list = ext4_xattr_security_list,
80 .get = ext4_xattr_security_get,
81 .set = ext4_xattr_security_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070082};