1                 : /*
       2                 :  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
       3                 :  * Use of this source code is governed by a BSD-style license that can be
       4                 :  * found in the LICENSE file.
       5                 :  */
       6                 : 
       7                 : 
       8                 : /* NaCl inter-module communication primitives. */
       9                 : 
      10                 : /* Used for UINT32_MAX */
      11                 : #if !NACL_WINDOWS
      12                 : # ifndef __STDC_LIMIT_MACROS
      13                 : #  define __STDC_LIMIT_MACROS
      14                 : # endif
      15                 : #include <stdint.h>
      16                 : #endif
      17                 : 
      18                 : /* TODO(robertm): stdio.h is included for NULL only - find a better way */
      19                 : #include <stdio.h>
      20                 : 
      21                 : #include "native_client/src/include/portability.h"
      22                 : 
      23                 : #include "native_client/src/shared/imc/nacl_imc_c.h"
      24                 : #include "native_client/src/shared/platform/nacl_log.h"
      25                 : 
      26                 : 
      27               5 : int NaClMessageSizeIsValid(const NaClMessageHeader *message) {
      28               5 :   size_t cur_bytes = 0;
      29                 :   static size_t const kMax = ~(uint32_t) 0;
      30                 :   size_t ix;
      31                 :   /* we assume that sizeof(uint32_t) <= sizeof(size_t) */
      32                 : 
      33               5 :   for (ix = 0; ix < message->iov_length; ++ix) {
      34               5 :     if (kMax - cur_bytes < message->iov[ix].length) {
      35               0 :       return 0;
      36                 :     }
      37               5 :     cur_bytes += message->iov[ix].length;  /* no overflow is possible */
      38               5 :   }
      39               5 :   return 1;
      40               5 : }