linux/fs/jffs2/security.c
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   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(struct dentry *dentry, const char *name,
  52                                   void *buffer, size_t size, int type)
  53{
  54        if (!strcmp(name, ""))
  55                return -EINVAL;
  56
  57        return do_jffs2_getxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
  58                                 name, buffer, size);
  59}
  60
  61static int jffs2_security_setxattr(struct dentry *dentry, const char *name,
  62                const void *buffer, size_t size, int flags, int type)
  63{
  64        if (!strcmp(name, ""))
  65                return -EINVAL;
  66
  67        return do_jffs2_setxattr(dentry->d_inode, JFFS2_XPREFIX_SECURITY,
  68                                 name, buffer, size, flags);
  69}
  70
  71static size_t jffs2_security_listxattr(struct dentry *dentry, char *list,
  72                size_t list_size, const char *name, size_t name_len, int type)
  73{
  74        size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
  75
  76        if (list && retlen <= list_size) {
  77                strcpy(list, XATTR_SECURITY_PREFIX);
  78                strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
  79        }
  80
  81        return retlen;
  82}
  83
  84const struct xattr_handler jffs2_security_xattr_handler = {
  85        .prefix = XATTR_SECURITY_PREFIX,
  86        .list = jffs2_security_listxattr,
  87        .set = jffs2_security_setxattr,
  88        .get = jffs2_security_getxattr
  89};
  90
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