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 Attachment -------------- */
  26int jffs2_init_security(struct inode *inode, struct inode *dir)
  27{
  28        int rc;
  29        size_t len;
  30        void *value;
  31        char *name;
  32
  33        rc = security_inode_init_security(inode, dir, &name, &value, &len);
  34        if (rc) {
  35                if (rc == -EOPNOTSUPP)
  36                        return 0;
  37                return rc;
  38        }
  39        rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
  40
  41        kfree(name);
  42        kfree(value);
  43        return rc;
  44}
  45
  46/* ---- XATTR Handler for "security.*" ----------------- */
  47static int jffs2_security_getxattr(struct dentry *dentry, const char *name,
  48                                   void *buffer, size_t size, int type)
  49{
  50        if (!strcmp(name, ""))
  51                return -EINVAL;
  52
  53        return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
  54                                 name, buffer, size);
  55}
  56
  57static int jffs2_security_setxattr(struct dentry *dentry, const char *name,
  58                const void *buffer, size_t size, int flags, int type)
  59{
  60        if (!strcmp(name, ""))
  61                return -EINVAL;
  62
  63        return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
  64                                 name, buffer, size, flags);
  65}
  66
  67static size_t jffs2_security_listxattr(struct dentry *dentry, char *list,
  68                size_t list_size, const char *name, size_t name_len, int type)
  69{
  70        size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
  71
  72        if (list && retlen <= list_size) {
  73                strcpy(list, XATTR_SECURITY_PREFIX);
  74                strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
  75        }
  76
  77        return retlen;
  78}
  79
  80const struct xattr_handler jffs2_security_xattr_handler = {
  81        .prefix = XATTR_SECURITY_PREFIX,
  82        .list = jffs2_security_listxattr,
  83        .set = jffs2_security_setxattr,
  84        .get = jffs2_security_getxattr
  85};
  86