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 "hfsplus_fs.h"
11 #include "xattr.h"
12
hfsplus_security_getxattr(struct dentry * dentry,const char * name,void * buffer,size_t size,int type)13 static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
14 void *buffer, size_t size, int type)
15 {
16 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
17 size_t len = strlen(name);
18
19 if (!strcmp(name, ""))
20 return -EINVAL;
21
22 if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
23 return -EOPNOTSUPP;
24
25 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
26 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
27
28 return hfsplus_getxattr(dentry, xattr_name, buffer, size);
29 }
30
hfsplus_security_setxattr(struct dentry * dentry,const char * name,const void * buffer,size_t size,int flags,int type)31 static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
32 const void *buffer, size_t size, int flags, int type)
33 {
34 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
35 size_t len = strlen(name);
36
37 if (!strcmp(name, ""))
38 return -EINVAL;
39
40 if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
41 return -EOPNOTSUPP;
42
43 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
44 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
45
46 return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
47 }
48
hfsplus_security_listxattr(struct dentry * dentry,char * list,size_t list_size,const char * name,size_t name_len,int type)49 static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
50 size_t list_size, const char *name, size_t name_len, int type)
51 {
52 /*
53 * This method is not used.
54 * It is used hfsplus_listxattr() instead of generic_listxattr().
55 */
56 return -EOPNOTSUPP;
57 }
58
hfsplus_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)59 static int hfsplus_initxattrs(struct inode *inode,
60 const struct xattr *xattr_array,
61 void *fs_info)
62 {
63 const struct xattr *xattr;
64 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
65 size_t xattr_name_len;
66 int err = 0;
67
68 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
69 xattr_name_len = strlen(xattr->name);
70
71 if (xattr_name_len == 0)
72 continue;
73
74 if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
75 HFSPLUS_ATTR_MAX_STRLEN)
76 return -EOPNOTSUPP;
77
78 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
79 strcpy(xattr_name +
80 XATTR_SECURITY_PREFIX_LEN, xattr->name);
81 memset(xattr_name +
82 XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
83
84 err = __hfsplus_setxattr(inode, xattr_name,
85 xattr->value, xattr->value_len, 0);
86 if (err)
87 break;
88 }
89 return err;
90 }
91
hfsplus_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)92 int hfsplus_init_security(struct inode *inode, struct inode *dir,
93 const struct qstr *qstr)
94 {
95 return security_inode_init_security(inode, dir, qstr,
96 &hfsplus_initxattrs, NULL);
97 }
98
99 const struct xattr_handler hfsplus_xattr_security_handler = {
100 .prefix = XATTR_SECURITY_PREFIX,
101 .list = hfsplus_security_listxattr,
102 .get = hfsplus_security_getxattr,
103 .set = hfsplus_security_setxattr,
104 };
105