original development tree for Linux kernel GTP module; now long in mainline.
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* linux/fs/ext4/xattr_security.c
* Handler for storing security labels as extended attributes.
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/security.h>
#include <linux/slab.h>
#include "ext4_jbd2.h"
#include "ext4.h"
#include "xattr.h"
static size_t
ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
const char *name, size_t name_len, int type)
const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
const size_t total_len = prefix_len + name_len + 1;
if (list && total_len <= list_size) {
memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
memcpy(list+prefix_len, name, name_len);
list[prefix_len + name_len] = '\0';
return total_len;
static int
ext4_xattr_security_get(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
if (strcmp(name, "") == 0)
return -EINVAL;
return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
name, buffer, size);
static int
ext4_xattr_security_set(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
if (strcmp(name, "") == 0)
return -EINVAL;
return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
name, value, size, flags);
static int
ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)
const struct xattr *xattr;
handle_t *handle = fs_info;
int err = 0;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
err = ext4_xattr_set_handle(handle, inode,
xattr->name, xattr->value,
xattr->value_len, 0);
if (err < 0)
return err;
ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
const struct qstr *qstr)
return security_inode_init_security(inode, dir, qstr,
&ext4_initxattrs, handle);
const struct xattr_handler ext4_xattr_security_handler = {
.list = ext4_xattr_security_list,
.get = ext4_xattr_security_get,
.set = ext4_xattr_security_set,