From: Ariff Abdullah <skywizard@...>
Date: 2002-12-29T14:12:17+09:00
Subject: Re: string.c (str_alloc) ruby 1.8 + ruby-gtk crash

Here is the poc:

poc.c :-
#include "ruby.h"
#include <stdio.h>

VALUE poC;

static VALUE
poc_run(self, str)
   VALUE self, str;
{
   const char *dummy = STR2CSTR(str);
   if (dummy) {
     printf("OK : \"%s\"\n", dummy);
   } else {
     printf("Where am I ?!?!?!?\n");
   }
   return self;
}

void
Init_poc()
{
   poC = rb_define_class("Poc", rb_cObject);
   rb_define_singleton_method(poC, "run", poc_run, 1);
}

extconf.rb :-
require 'mkmf'
create_makefile("poc")

and the poc_test.rb :-
require 'poc'

a = ARGV[0] || ''
b = a.dup()
Poc.run(b)

and now..


[sky@wizard poc]# ./poc_test.rb
OK : ""
[sky@wizard poc]# ./poc_test.rb " "
OK : " "
[sky@wizard poc]# ./poc_test.rb "a"
OK : "a"
[sky@wizard poc]# ./poc_test.rb ""
./poc_test.rb:41: [BUG] Segmentation fault
ruby 1.8.0 (2002-12-28) [i386-freebsd4]
Abort trap (core dumped)
[root@wizard poc]#

str.len = 0 (string.c , str_alloc()) , str.ptr = 0 ?

nobu.nokada@softhome.net wrote:
> Hi,
> 
> At Sun, 29 Dec 2002 05:21:43 +0900,
> Ariff Abdullah wrote:
> 
>>[sky@wizard build]# ./ruby /tmp/bla.rb ''
>>Gdk-CRITICAL **: file gdkfont.c: line 319 (gdk_string_width):
>>assertion `string != NULL' failed.
> 
> 
> Update ruby-gtk.  In 1.8, extension libraries have to consider
> the case RSTRING(string)->ptr is NULL.
>