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 "hfsplus_fs.h"
11#include "xattr.h"
12#include "acl.h"
13
14static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
15 void *buffer, size_t size, int type)
16{
17 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
18 size_t len = strlen(name);
19
20 if (!strcmp(name, ""))
21 return -EINVAL;
22
23 if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
24 return -EOPNOTSUPP;
25
26 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
27 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
28
29 return hfsplus_getxattr(dentry, xattr_name, buffer, size);
30}
31
32static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
33 const void *buffer, size_t size, int flags, int type)
34{
35 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
36 size_t len = strlen(name);
37
38 if (!strcmp(name, ""))
39 return -EINVAL;
40
41 if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
42 return -EOPNOTSUPP;
43
44 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
45 strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
46
47 return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
48}
49
50static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
51 size_t list_size, const char *name, size_t name_len, int type)
52{
53 /*
54 * This method is not used.
55 * It is used hfsplus_listxattr() instead of generic_listxattr().
56 */
57 return -EOPNOTSUPP;
58}
59
60static int hfsplus_initxattrs(struct inode *inode,
61 const struct xattr *xattr_array,
62 void *fs_info)
63{
64 const struct xattr *xattr;
65 char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
66 size_t xattr_name_len;
67 int err = 0;
68
69 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
70 xattr_name_len = strlen(xattr->name);
71
72 if (xattr_name_len == 0)
73 continue;
74
75 if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
76 HFSPLUS_ATTR_MAX_STRLEN)
77 return -EOPNOTSUPP;
78
79 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
80 strcpy(xattr_name +
81 XATTR_SECURITY_PREFIX_LEN, xattr->name);
82 memset(xattr_name +
83 XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
84
85 err = __hfsplus_setxattr(inode, xattr_name,
86 xattr->value, xattr->value_len, 0);
87 if (err)
88 break;
89 }
90 return err;
91}
92
93int hfsplus_init_security(struct inode *inode, struct inode *dir,
94 const struct qstr *qstr)
95{
96 return security_inode_init_security(inode, dir, qstr,
97 &hfsplus_initxattrs, NULL);
98}
99
100int hfsplus_init_inode_security(struct inode *inode,
101 struct inode *dir,
102 const struct qstr *qstr)
103{
104 int err;
105
106 err = hfsplus_init_posix_acl(inode, dir);
107 if (!err)
108 err = hfsplus_init_security(inode, dir, qstr);
109 return err;
110}
111
112const struct xattr_handler hfsplus_xattr_security_handler = {
113 .prefix = XATTR_SECURITY_PREFIX,
114 .list = hfsplus_security_listxattr,
115 .get = hfsplus_security_getxattr,
116 .set = hfsplus_security_setxattr,
117};