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Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -08001/*
2 * linux/fs/hfsplus/xattr_trusted.c
3 *
4 * Vyacheslav Dubeyko <slava@dubeyko.com>
5 *
6 * Handler for storing security labels as extended attributes.
7 */
8
9#include <linux/security.h>
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070010#include <linux/nls.h>
11
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080012#include "hfsplus_fs.h"
13#include "xattr.h"
Vyacheslav Dubeykob4c11072013-09-11 14:24:30 -070014#include "acl.h"
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080015
Andreas Gruenbacherd9a82a02015-10-04 19:18:51 +020016static int hfsplus_security_getxattr(const struct xattr_handler *handler,
17 struct dentry *dentry, const char *name,
18 void *buffer, size_t size)
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080019{
Fabian Fredericka3cef4c2015-04-16 12:46:58 -070020 return hfsplus_getxattr(dentry, name, buffer, size,
21 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,
26 struct dentry *dentry, const char *name,
27 const void *buffer, size_t size, int flags)
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080028{
Fabian Frederick5e614732015-04-16 12:47:01 -070029 return hfsplus_setxattr(dentry, name, buffer, size, flags,
30 XATTR_SECURITY_PREFIX,
31 XATTR_SECURITY_PREFIX_LEN);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080032}
33
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080034static int hfsplus_initxattrs(struct inode *inode,
35 const struct xattr *xattr_array,
36 void *fs_info)
37{
38 const struct xattr *xattr;
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070039 char *xattr_name;
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080040 int err = 0;
41
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070042 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
43 GFP_KERNEL);
44 if (!xattr_name)
45 return -ENOMEM;
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080046 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080047
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070048 if (!strcmp(xattr->name, ""))
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080049 continue;
50
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080051 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
52 strcpy(xattr_name +
53 XATTR_SECURITY_PREFIX_LEN, xattr->name);
54 memset(xattr_name +
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070055 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080056
57 err = __hfsplus_setxattr(inode, xattr_name,
58 xattr->value, xattr->value_len, 0);
59 if (err)
60 break;
61 }
Hin-Tak Leungbf29e882014-06-06 14:36:22 -070062 kfree(xattr_name);
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080063 return err;
64}
65
66int hfsplus_init_security(struct inode *inode, struct inode *dir,
67 const struct qstr *qstr)
68{
69 return security_inode_init_security(inode, dir, qstr,
70 &hfsplus_initxattrs, NULL);
71}
72
Vyacheslav Dubeykob4c11072013-09-11 14:24:30 -070073int hfsplus_init_inode_security(struct inode *inode,
74 struct inode *dir,
75 const struct qstr *qstr)
76{
77 int err;
78
79 err = hfsplus_init_posix_acl(inode, dir);
80 if (!err)
81 err = hfsplus_init_security(inode, dir, qstr);
82 return err;
83}
84
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080085const struct xattr_handler hfsplus_xattr_security_handler = {
86 .prefix = XATTR_SECURITY_PREFIX,
Vyacheslav Dubeyko127e5f52013-02-27 17:03:03 -080087 .get = hfsplus_security_getxattr,
88 .set = hfsplus_security_setxattr,
89};