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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -08002/*
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>
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070011#include <linux/nls.h>
12
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080013#include "hfsplus_fs.h"
14#include "xattr.h"
15
Andreas Gruenbacherd9a82a02015-10-04 19:18:51 +020016static int hfsplus_security_getxattr(const struct xattr_handler *handler,
Al Virob2968212016-04-10 20:48:24 -040017 struct dentry *unused, struct inode *inode,
18 const char *name, void *buffer, size_t size)
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080019{
Al Virob2968212016-04-10 20:48:24 -040020 return hfsplus_getxattr(inode, name, buffer, size,
Fabian Fredericka3cef4c2015-04-16 12:46:58 -070021 XATTR_SECURITY_PREFIX,
22 XATTR_SECURITY_PREFIX_LEN);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080023}
24
Andreas Gruenbacherd9a82a02015-10-04 19:18:51 +020025static int hfsplus_security_setxattr(const struct xattr_handler *handler,
Al Viro59301222016-05-27 10:19:30 -040026 struct dentry *unused, struct inode *inode,
27 const char *name, const void *buffer,
28 size_t size, int flags)
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080029{
Al Viro59301222016-05-27 10:19:30 -040030 return hfsplus_setxattr(inode, name, buffer, size, flags,
Fabian Frederick5e614732015-04-16 12:47:01 -070031 XATTR_SECURITY_PREFIX,
32 XATTR_SECURITY_PREFIX_LEN);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080033}
34
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080035static int hfsplus_initxattrs(struct inode *inode,
36 const struct xattr *xattr_array,
37 void *fs_info)
38{
39 const struct xattr *xattr;
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070040 char *xattr_name;
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080041 int err = 0;
42
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070043 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
44 GFP_KERNEL);
45 if (!xattr_name)
46 return -ENOMEM;
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080047 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080048
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070049 if (!strcmp(xattr->name, ""))
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080050 continue;
51
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080052 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
53 strcpy(xattr_name +
54 XATTR_SECURITY_PREFIX_LEN, xattr->name);
55 memset(xattr_name +
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070056 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080057
58 err = __hfsplus_setxattr(inode, xattr_name,
59 xattr->value, xattr->value_len, 0);
60 if (err)
61 break;
62 }
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070063 kfree(xattr_name);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080064 return err;
65}
66
67int hfsplus_init_security(struct inode *inode, struct inode *dir,
68 const struct qstr *qstr)
69{
70 return security_inode_init_security(inode, dir, qstr,
71 &hfsplus_initxattrs, NULL);
72}
73
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080074const struct xattr_handler hfsplus_xattr_security_handler = {
75 .prefix = XATTR_SECURITY_PREFIX,
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080076 .get = hfsplus_security_getxattr,
77 .set = hfsplus_security_setxattr,
78};