2 * linux/fs/ext4/xattr_security.c
3 * Handler for storing security labels as extended attributes.
6 #include <linux/string.h>
8 #include <linux/security.h>
9 #include <linux/slab.h>
10 #include "ext4_jbd2.h"
15 ext4_xattr_security_list(const struct xattr_handler *handler,
16 struct dentry *dentry, char *list, size_t list_size,
17 const char *name, size_t name_len)
19 const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
20 const size_t total_len = prefix_len + name_len + 1;
23 if (list && total_len <= list_size) {
24 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
25 memcpy(list+prefix_len, name, name_len);
26 list[prefix_len + name_len] = '\0';
32 ext4_xattr_security_get(const struct xattr_handler *handler,
33 struct dentry *dentry, const char *name,
34 void *buffer, size_t size)
36 return ext4_xattr_get(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
41 ext4_xattr_security_set(const struct xattr_handler *handler,
42 struct dentry *dentry, const char *name,
43 const void *value, size_t size, int flags)
45 return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
46 name, value, size, flags);
50 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
53 const struct xattr *xattr;
54 handle_t *handle = fs_info;
57 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
58 err = ext4_xattr_set_handle(handle, inode,
59 EXT4_XATTR_INDEX_SECURITY,
60 xattr->name, xattr->value,
69 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
70 const struct qstr *qstr)
72 return security_inode_init_security(inode, dir, qstr,
73 &ext4_initxattrs, handle);
76 const struct xattr_handler ext4_xattr_security_handler = {
77 .prefix = XATTR_SECURITY_PREFIX,
78 .list = ext4_xattr_security_list,
79 .get = ext4_xattr_security_get,
80 .set = ext4_xattr_security_set,