tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
16static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
17 void *buffer, size_t size, int type)
18{
19 char *xattr_name;
20 int res;
21
22 if (!strcmp(name, ""))
23 return -EINVAL;
24
25 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
26 GFP_KERNEL);
27 if (!xattr_name)
28 return -ENOMEM;
29 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
30 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
31
32 res = hfsplus_getxattr(dentry, xattr_name, buffer, size);
33 kfree(xattr_name);
34 return res;
35}
36
37static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
38 const void *buffer, size_t size, int flags, int type)
39{
40 char *xattr_name;
41 int res;
42
43 if (!strcmp(name, ""))
44 return -EINVAL;
45
46 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
47 GFP_KERNEL);
48 if (!xattr_name)
49 return -ENOMEM;
50 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
51 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
52
53 res = hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
54 kfree(xattr_name);
55 return res;
56}
57
58static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
59 size_t list_size, const char *name, size_t name_len, int type)
60{
61 /*
62 * This method is not used.
63 * It is used hfsplus_listxattr() instead of generic_listxattr().
64 */
65 return -EOPNOTSUPP;
66}
67
68static int hfsplus_initxattrs(struct inode *inode,
69 const struct xattr *xattr_array,
70 void *fs_info)
71{
72 const struct xattr *xattr;
73 char *xattr_name;
74 int err = 0;
75
76 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
77 GFP_KERNEL);
78 if (!xattr_name)
79 return -ENOMEM;
80 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
81
82 if (!strcmp(xattr->name, ""))
83 continue;
84
85 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
86 strcpy(xattr_name +
87 XATTR_SECURITY_PREFIX_LEN, xattr->name);
88 memset(xattr_name +
89 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
90
91 err = __hfsplus_setxattr(inode, xattr_name,
92 xattr->value, xattr->value_len, 0);
93 if (err)
94 break;
95 }
96 kfree(xattr_name);
97 return err;
98}
99
100int hfsplus_init_security(struct inode *inode, struct inode *dir,
101 const struct qstr *qstr)
102{
103 return security_inode_init_security(inode, dir, qstr,
104 &hfsplus_initxattrs, NULL);
105}
106
107int hfsplus_init_inode_security(struct inode *inode,
108 struct inode *dir,
109 const struct qstr *qstr)
110{
111 int err;
112
113 err = hfsplus_init_posix_acl(inode, dir);
114 if (!err)
115 err = hfsplus_init_security(inode, dir, qstr);
116 return err;
117}
118
119const struct xattr_handler hfsplus_xattr_security_handler = {
120 .prefix = XATTR_SECURITY_PREFIX,
121 .list = hfsplus_security_listxattr,
122 .get = hfsplus_security_getxattr,
123 .set = hfsplus_security_setxattr,
124};