linux/fs/ext4/xattr_security.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/fs/ext4/xattr_security.c
   4 * Handler for storing security labels as extended attributes.
   5 */
   6
   7#include <linux/string.h>
   8#include <linux/fs.h>
   9#include <linux/security.h>
  10#include <linux/slab.h>
  11#include "ext4_jbd2.h"
  12#include "ext4.h"
  13#include "xattr.h"
  14
  15static int
  16ext4_xattr_security_get(const struct xattr_handler *handler,
  17                        struct dentry *unused, struct inode *inode,
  18                        const char *name, void *buffer, size_t size)
  19{
  20        return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
  21                              name, buffer, size);
  22}
  23
  24static int
  25ext4_xattr_security_set(const struct xattr_handler *handler,
  26                        struct user_namespace *mnt_userns,
  27                        struct dentry *unused, struct inode *inode,
  28                        const char *name, const void *value,
  29                        size_t size, int flags)
  30{
  31        return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
  32                              name, value, size, flags);
  33}
  34
  35static int
  36ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  37                void *fs_info)
  38{
  39        const struct xattr *xattr;
  40        handle_t *handle = fs_info;
  41        int err = 0;
  42
  43        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  44                err = ext4_xattr_set_handle(handle, inode,
  45                                            EXT4_XATTR_INDEX_SECURITY,
  46                                            xattr->name, xattr->value,
  47                                            xattr->value_len, XATTR_CREATE);
  48                if (err < 0)
  49                        break;
  50        }
  51        return err;
  52}
  53
  54int
  55ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
  56                   const struct qstr *qstr)
  57{
  58        return security_inode_init_security(inode, dir, qstr,
  59                                            &ext4_initxattrs, handle);
  60}
  61
  62const struct xattr_handler ext4_xattr_security_handler = {
  63        .prefix = XATTR_SECURITY_PREFIX,
  64        .get    = ext4_xattr_security_get,
  65        .set    = ext4_xattr_security_set,
  66};
  67