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
hfsplus_security_getxattr(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)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
hfsplus_security_setxattr(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)25 static int hfsplus_security_setxattr(const struct xattr_handler *handler,
26 struct dentry *unused, struct inode *inode,
27 const char *name, const void *buffer,
28 size_t size, int flags)
29 {
30 return hfsplus_setxattr(inode, name, buffer, size, flags,
31 XATTR_SECURITY_PREFIX,
32 XATTR_SECURITY_PREFIX_LEN);
33 }
34
hfsplus_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)35 static int hfsplus_initxattrs(struct inode *inode,
36 const struct xattr *xattr_array,
37 void *fs_info)
38 {
39 const struct xattr *xattr;
40 char *xattr_name;
41 int err = 0;
42
43 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
44 GFP_KERNEL);
45 if (!xattr_name)
46 return -ENOMEM;
47 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
48
49 if (!strcmp(xattr->name, ""))
50 continue;
51
52 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
53 strcpy(xattr_name +
54 XATTR_SECURITY_PREFIX_LEN, xattr->name);
55 memset(xattr_name +
56 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
57
58 err = __hfsplus_setxattr(inode, xattr_name,
59 xattr->value, xattr->value_len, 0);
60 if (err)
61 break;
62 }
63 kfree(xattr_name);
64 return err;
65 }
66
hfsplus_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)67 int 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
74 const struct xattr_handler hfsplus_xattr_security_handler = {
75 .prefix = XATTR_SECURITY_PREFIX,
76 .get = hfsplus_security_getxattr,
77 .set = hfsplus_security_setxattr,
78 };
79