1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hfsplus/xattr_trusted.c
4 *
5 * Vyacheslav Dubeyko <slava@dubeyko.com>
6 *
7 * Handler for storing security labels as extended attributes.
8 */
9
10 #include <linux/security.h>
11 #include <linux/nls.h>
12
13 #include "hfsplus_fs.h"
14 #include "xattr.h"
15
16 static int hfsplus_security_getxattr(const struct xattr_handler *handler,
17 struct dentry *unused, struct inode *inode,
18 const char *name, void *buffer, size_t size)
19 {
20 return hfsplus_getxattr(inode, name, buffer, size,
21 XATTR_SECURITY_PREFIX,
22 XATTR_SECURITY_PREFIX_LEN);
23 }
24
25 static int hfsplus_security_setxattr(const struct xattr_handler *handler,
26 struct mnt_idmap *idmap,
27 struct dentry *unused, struct inode *inode,
28 const char *name, const void *buffer,
29 size_t size, int flags)
30 {
31 return hfsplus_setxattr(inode, name, buffer, size, flags,
32 XATTR_SECURITY_PREFIX,
33 XATTR_SECURITY_PREFIX_LEN);
34 }
35
36 static int hfsplus_initxattrs(struct inode *inode,
37 const struct xattr *xattr_array,
38 void *fs_info)
39 {
40 const struct xattr *xattr;
41 char *xattr_name;
42 int err = 0;
43
44 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
45 GFP_KERNEL);
46 if (!xattr_name)
47 return -ENOMEM;
48 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
49
50 if (!strcmp(xattr->name, ""))
51 continue;
52
53 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
54 strcpy(xattr_name +
55 XATTR_SECURITY_PREFIX_LEN, xattr->name);
56 memset(xattr_name +
57 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
58
59 err = __hfsplus_setxattr(inode, xattr_name,
60 xattr->value, xattr->value_len, 0);
61 if (err)
62 break;
63 }
64 kfree(xattr_name);
65 return err;
66 }
67
68 int hfsplus_init_security(struct inode *inode, struct inode *dir,
69 const struct qstr *qstr)
70 {
71 return security_inode_init_security(inode, dir, qstr,
72 &hfsplus_initxattrs, NULL);
73 }
74
75 const struct xattr_handler hfsplus_xattr_security_handler = {
76 .prefix = XATTR_SECURITY_PREFIX,
77 .get = hfsplus_security_getxattr,
78 .set = hfsplus_security_setxattr,
79 };
80
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