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/* writetext.c - Test wether a .text sections can be written
*
* 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 <unistd.h>
#include <signal.h>
#include <sys/mman.h>
#include "body.h"
const char testname[] = "Writable text segments ";
extern int shlibtest( void );
static void sigsegv( int sig )
{
printf( "Killed\n" );
exit( 1 );
}
void doit( void )
{
char *buf;
char c;
buf = (char*)shlibtest;
signal( SIGSEGV, sigsegv );
/* Try to make the text writable first by using mprotect
*
* Some people like to disable this call to make the results look
* better for their system.
*
* The purpose of the mprotect() here is to *really* try to write to
* that piece of executable memory. If you want to know whether a box
* can be opened or not, you try to pull it open. Just looking at it,
* seeing that it is closed, and therefore concluding that it cannot
* be opened is rather lame.
*
* But then, it is of course easier to get good paxtest results by
* disabling this mprotect than to fix your kernel code and userland.
*/
do_mprotect( buf, 4096, PROT_READ|PROT_WRITE|PROT_EXEC );
/* Try to write something */
*buf = 'X';
/* It worked when the function returns */
itworked();
}
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