release/src-rt-6.x.4708/linux/linux-2.6.36/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 -------------- */
  26 int 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.*" ----------------- */
  47 static 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
  57 static 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
  67 static 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
  80 const 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 };