LXR linux/fs/jffs2/security.c

   1/*
   2 * JFFS2 -- Journalling Flash File System, Version 2.
   3 *
   4 * Copyright © 2006  NEC Corporation
   5 *
   6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
   7 *
   8 * For licensing information, see the file 'LICENCE' in this directory.
   9 *
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/slab.h>
  14#include <linux/fs.h>
  15#include <linux/time.h>
  16#include <linux/pagemap.h>
  17#include <linux/highmem.h>
  18#include <linux/crc32.h>
  19#include <linux/jffs2.h>
  20#include <linux/xattr.h>
  21#include <linux/mtd/mtd.h>
  22#include <linux/security.h>
  23#include "nodelist.h"
  24
  25/* ---- Initial Security Label(s) Attachment callback --- */
  26static int jffs2_initxattrs(struct inode *inode,
  27                            const struct xattr *xattr_array, void *fs_info)
  28{
  29        const struct xattr *xattr;
  30        int err = 0;
  31
  32        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  33                err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
  34                                        xattr->name, xattr->value,
  35                                        xattr->value_len, 0);
  36                if (err < 0)
  37                        break;
  38        }
  39        return err;
  40}
  41
  42/* ---- Initial Security Label(s) Attachment ----------- */
  43int jffs2_init_security(struct inode *inode, struct inode *dir,
  44                        const struct qstr *qstr)
  45{
  46        return security_inode_init_security(inode, dir, qstr,
  47                                            &jffs2_initxattrs, NULL);
  48}
  49
  50/* ---- XATTR Handler for "security.*" ----------------- */
  51static int jffs2_security_getxattr(const struct xattr_handler *handler,
  52                                   struct dentry *unused, struct inode *inode,
  53                                   const char *name, void *buffer, size_t size)
  54{
  55        return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY,
  56                                 name, buffer, size);
  57}
  58
  59static int jffs2_security_setxattr(const struct xattr_handler *handler,
  60                                   struct user_namespace *mnt_userns,
  61                                   struct dentry *unused, struct inode *inode,
  62                                   const char *name, const void *buffer,
  63                                   size_t size, int flags)
  64{
  65        return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY,
  66                                 name, buffer, size, flags);
  67}
  68
  69const struct xattr_handler jffs2_security_xattr_handler = {
  70        .prefix = XATTR_SECURITY_PREFIX,
  71        .set = jffs2_security_setxattr,
  72        .get = jffs2_security_getxattr
  73};
  74