GNU Linux-libre 4.9.308-gnu1
[releases.git] / fs / hfsplus / xattr_security.c
1 /*
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>
10 #include <linux/nls.h>
11
12 #include "hfsplus_fs.h"
13 #include "xattr.h"
14 #include "acl.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 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
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
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 int hfsplus_init_inode_security(struct inode *inode,
75                                                 struct inode *dir,
76                                                 const struct qstr *qstr)
77 {
78         int err;
79
80         err = hfsplus_init_posix_acl(inode, dir);
81         if (!err)
82                 err = hfsplus_init_security(inode, dir, qstr);
83         return err;
84 }
85
86 const struct xattr_handler hfsplus_xattr_security_handler = {
87         .prefix = XATTR_SECURITY_PREFIX,
88         .get    = hfsplus_security_getxattr,
89         .set    = hfsplus_security_setxattr,
90 };