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mprotdata.c

/* mprotdata.c - Tests wether code in the .data segment can be executed after
 *               trying to use mprotect() to make it executable.
 *
 * Copyright (c)2003 by Peter Busser <peter@adamantix.org>
 * This file has been released under the GNU Public Licence version 2 or later
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/mman.h>
#include "body.h"

const char testname[] = "Executable data (mprotect)               ";

char buf = '\xc3';      /* RETN instruction */

void doit( void )
{
      fptr func;

      /* Convert the pointer to a function pointer */
      func = (fptr)&buf;

      /* Try to make the data executable first by using mprotect */
      /* Due to an OpenBSD bug PROT_READ is required */
      do_mprotect( &buf, 1, PROT_READ|PROT_EXEC );

      /* Call the code in the buffer */
      func();

      do_mprotect( &buf, 1, PROT_READ|PROT_WRITE );

      /* It worked when the function returns */
      itworked();
}

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