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, value: 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, value: 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(p: xattr_name, XATTR_SECURITY_PREFIX); |
54 | strcpy(p: xattr_name + |
55 | XATTR_SECURITY_PREFIX_LEN, q: xattr->name); |
56 | memset(xattr_name + |
57 | XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1); |
58 | |
59 | err = __hfsplus_setxattr(inode, name: xattr_name, |
60 | value: xattr->value, size: xattr->value_len, flags: 0); |
61 | if (err) |
62 | break; |
63 | } |
64 | kfree(objp: 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 | initxattrs: &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 | |