Crash to:

<?
	if (mcrypt_module_is_block_algorithm_mode(MCRYPT_GOST))
		echo "true\n";
	else
		echo "false\n";
?>

(gdb) bt
#0  0x00000000 in ?? ()
#1  0x4023d8de in mcrypt_module_is_block_algorithm_mode (mode=0x83c1d34 "gost", m_directory=0x0) at mcrypt_modules.c:610
#2  0x0814d1bf in zif_mcrypt_module_is_block_algorithm_mode (ht=1, return_value=0x83c1d6c, this_ptr=0x0, return_value_used=1)
    at mcrypt.c:876
#3  0x081aae6a in execute (op_array=0x83c1e8c) at ./zend_execute.c:1590
#4  0x080e5239 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at zend.c:814
#5  0x080801c1 in php_execute_script (primary_file=0xbffff7f0) at main.c:1307
#6  0x0807a8cc in main (argc=3, argv=0xbffff864) at cgi_main.c:738
#7  0x404f19cb in __libc_start_main (main=0x8079f34 <main>, argc=3, argv=0xbffff864, init=0x8076e1c <_init>, 
    fini=0x82310d0 <_fini>, rtld_fini=0x4000aea0 <_dl_fini>, stack_end=0xbffff85c) at ../sysdeps/generic/libc-start.c:92

libmcrypt-2.4.18

Hello,

your script is buggy, GOST, is not a mode, but an algorithm.
It indeed crashes with this code, but to me it seems like it is an libmcrypt problem.

If you use this:
<?
        if (mcrypt_module_is_block_algorithm(MCRYPT_GOST))
                echo "true\n";
        else
                echo "false\n";
?>

it works, but it returns true if it is NOT a block algorithm, which is a bug in the extension.
(mcrypt returns 1 if it is a block algorithm).

Can you confirm that it does not crash with the script I pasted?

Derick

I know what it is buggy script, but it not the justification for "Segmentation".

Your script work for me and print "false"

i use php-4.1.1

This is not a PHP bug, but in libmcrypt. I reported this to the author of the library.
This is the C code I used for it:

#include <unistd.h>
#include <mcrypt.h>

void main (void)
{
    int res;

    res = mcrypt_module_is_block_algorithm ("gost", NULL);
}

This one works, the next does not (segfaults):

#include <unistd.h>
#include <mcrypt.h>

void main (void)
{
    int res;

    res = mcrypt_module_is_block_algorithm_mode ("gost", NULL);
}


regards,
Derick

From: Nikos Mavroyanopoulos <nmav@hellug.gr>
To: mcrypt-dev@lists.hellug.gr
Subject: Re: [mcrypt-dev] Crash

On Tue, 25 Dec 2001 18:57:29 +0100 (CET)
Derick Rethans <d.rethans@jdimedia.nl> wrote:

> Hello,
> I get a crash with the 2nd program (and I know "gost" is not a
> algorithm_mode, but it shouldn't crash IMO).
Yes, it shouldn't crash. I'll check it (after the vacations!).
Thank you.

It's fixed in mcrypt now. This will be in the next release of it (2.4.19).

Derick