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
hfsplus_security_getxattr(const struct xattr_handler * handler,struct dentry * dentry,const char * name,void * buffer,size_t size)16 static int hfsplus_security_getxattr(const struct xattr_handler *handler,
17 struct dentry *dentry, const char *name,
18 void *buffer, size_t size)
19 {
20 return hfsplus_getxattr(dentry, name, buffer, size,
21 XATTR_SECURITY_PREFIX,
22 XATTR_SECURITY_PREFIX_LEN);
23 }
24
hfsplus_security_setxattr(const struct xattr_handler * handler,struct dentry * dentry,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 *dentry, const char *name,
27 const void *buffer, size_t size, int flags)
28 {
29 return hfsplus_setxattr(dentry, name, buffer, size, flags,
30 XATTR_SECURITY_PREFIX,
31 XATTR_SECURITY_PREFIX_LEN);
32 }
33
hfsplus_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)34 static int hfsplus_initxattrs(struct inode *inode,
35 const struct xattr *xattr_array,
36 void *fs_info)
37 {
38 const struct xattr *xattr;
39 char *xattr_name;
40 int err = 0;
41
42 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
43 GFP_KERNEL);
44 if (!xattr_name)
45 return -ENOMEM;
46 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
47
48 if (!strcmp(xattr->name, ""))
49 continue;
50
51 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
52 strcpy(xattr_name +
53 XATTR_SECURITY_PREFIX_LEN, xattr->name);
54 memset(xattr_name +
55 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
56
57 err = __hfsplus_setxattr(inode, xattr_name,
58 xattr->value, xattr->value_len, 0);
59 if (err)
60 break;
61 }
62 kfree(xattr_name);
63 return err;
64 }
65
hfsplus_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)66 int hfsplus_init_security(struct inode *inode, struct inode *dir,
67 const struct qstr *qstr)
68 {
69 return security_inode_init_security(inode, dir, qstr,
70 &hfsplus_initxattrs, NULL);
71 }
72
hfsplus_init_inode_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)73 int hfsplus_init_inode_security(struct inode *inode,
74 struct inode *dir,
75 const struct qstr *qstr)
76 {
77 int err;
78
79 err = hfsplus_init_posix_acl(inode, dir);
80 if (!err)
81 err = hfsplus_init_security(inode, dir, qstr);
82 return err;
83 }
84
85 const struct xattr_handler hfsplus_xattr_security_handler = {
86 .prefix = XATTR_SECURITY_PREFIX,
87 .get = hfsplus_security_getxattr,
88 .set = hfsplus_security_setxattr,
89 };
90