fs/jffs2/security.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 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 #include <linux/kernel.h>
  12 #include <linux/slab.h>
  13 #include <linux/fs.h>
  14 #include <linux/time.h>
  15 #include <linux/pagemap.h>
  16 #include <linux/highmem.h>
  17 #include <linux/crc32.h>
  18 #include <linux/jffs2.h>
  19 #include <linux/xattr.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/security.h>
  22 #include "nodelist.h"
  23
  24 /* ---- Initial Security Label Attachment -------------- */
  25 int jffs2_init_security(struct inode *inode, struct inode *dir)
  26 {
  27         int rc;
  28         size_t len;
  29         void *value;
  30         char *name;
  31
  32         rc = security_inode_init_security(inode, dir, &name, &value, &len);
  33         if (rc) {
  34                 if (rc == -EOPNOTSUPP)
  35                         return 0;
  36                 return rc;
  37         }
  38         rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
  39
  40         kfree(name);
  41         kfree(value);
  42         return rc;
  43 }
  44
  45 /* ---- XATTR Handler for "security.*" ----------------- */
  46 static int jffs2_security_getxattr(struct inode *inode, const char *name,
  47                                    void *buffer, size_t size)
  48 {
  49         if (!strcmp(name, ""))
  50                 return -EINVAL;
  51
  52         return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size);
  53 }
  54
  55 static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer,
  56                                    size_t size, int flags)
  57 {
  58         if (!strcmp(name, ""))
  59                 return -EINVAL;
  60
  61         return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags);
  62 }
  63
  64 static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size,
  65                                        const char *name, size_t name_len)
  66 {
  67         size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
  68
  69         if (list && retlen <= list_size) {
  70                 strcpy(list, XATTR_SECURITY_PREFIX);
  71                 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
  72         }
  73
  74         return retlen;
  75 }
  76
  77 struct xattr_handler jffs2_security_xattr_handler = {
  78         .prefix = XATTR_SECURITY_PREFIX,
  79         .list = jffs2_security_listxattr,
  80         .set = jffs2_security_setxattr,
  81         .get = jffs2_security_getxattr
  82 };