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Bug #27884 Segfault on overloading
Submitted: 2004-04-06 05:33 UTC Modified: 2004-04-07 05:58 UTC
From: s dot dehaan at lobbes dot biz Assigned:
Status: Closed Package: Class/Object related
PHP Version: 4.3.6RC1 OS: Linux debian 2.2.20-idepci
Private report: No CVE-ID: None
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 [2004-04-06 05:33 UTC] s dot dehaan at lobbes dot biz 
Description:
------------
Overloading a class called 'Configuration' tends to segfault on 4.3.5, 4.3.6RC1 & 4.3.6RC3 (snaps.php.net). 

Reproduce code:
---------------
class Configuration {
	
	var $elem = Array();
	
	function elements() {
		return $this->elem;
	}
	
	function __get($prop_name, &$prop_value) {
		if(isset($this->elem[$prop_name])) {
			$prop_value = $this->elem[$prop_name];
			return true;
		} else {
			return false;
		}
	}
	
	function __set($prop_name, $prop_value) {
		$this->elem[$prop_name] = $prop_value;
		return true;
	}
}
 
overload('Configuration');

$_CONFIG->db_type = 'mysql';
$_CONFIG->db_host = 'localhost';
$_CONFIG->db_user = 'user';
$_CONFIG->db_password = 'passwd';
$_CONFIG->db_name = 'database';

cause's segfault & abnormal termination of script.


Expected result:
----------------
No output, just storing the called fields in an array & being able to fetch those values in the same manner as i've stored them using overloading.

Actual result:
--------------
(gdb) bt
#0  0x401c09c7 in memcpy () from /lib/libc.so.6
#1  0x404886cf in _mem_block_check (ptr=0xbfffb21c, silent=0,
    __zend_filename=0x4054bac0 "/root/source/php4-STABLE-200404060830/Zend/zend_execute.h", __zend_lineno=44, __zend_orig_filename=0x0, __zend_orig_lineno=0)
    at /root/source/php4-STABLE-200404060830/Zend/zend_alloc.c:675
#2  0x40488691 in _mem_block_check (ptr=0xbfffb21c, silent=1,
    __zend_filename=0x4054bac0 "/root/source/php4-STABLE-200404060830/Zend/zend_execute.h", __zend_lineno=44, __zend_orig_filename=0x0, __zend_orig_lineno=0)
    at /root/source/php4-STABLE-200404060830/Zend/zend_alloc.c:667
#3  0x40487847 in _efree (ptr=0xbfffb21c,
    __zend_filename=0x4054bac0 "/root/source/php4-STABLE-200404060830/Zend/zend_execute.h", __zend_lineno=44, __zend_orig_filename=0x0, __zend_orig_lineno=0)
    at /root/source/php4-STABLE-200404060830/Zend/zend_alloc.c:243
#4  0x40492522 in safe_free_zval_ptr (p=0xbfffb21c) at zend_execute.h:44
#5  0x40490a96 in _zval_ptr_dtor (zval_ptr=0x828a4d0,
    __zend_filename=0x4054c400 "/root/source/php4-STABLE-200404060830/Zend/zend_variables.c", __zend_lineno=167)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute_API.c:292
#6  0x4049a811 in _zval_ptr_dtor_wrapper (zval_ptr=0x828a4d0)
    at /root/source/php4-STABLE-200404060830/Zend/zend_variables.c:167
#7  0x404a281d in zend_hash_destroy (ht=0x82313e4)
    at /root/source/php4-STABLE-200404060830/Zend/zend_hash.c:553
#8  0x40491b47 in call_user_function_ex (function_table=0xbfffab98,
    object_pp=0xbfffac30, function_name=0xbfffab60, retval_ptr_ptr=0xbfffab4c,
    param_count=2, params=0xbfffab50, no_separation=0, symbol_table=0x0)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute_API.c:569
#9  0x4038c92f in call_set_handler (object=0x8292214, prop_name=0x8292680,
    value=0xbfffb21c)
    at /root/source/php4-STABLE-200404060830/ext/overload/overload.c:307
#10 0x4038cfd6 in overload_set_property (property_reference=0xbfffb1d4,
    value=0xbfffb21c)
    at /root/source/php4-STABLE-200404060830/ext/overload/overload.c:468
#11 0x404acb11 in set_overloaded_property (T=0xbfffb1c8, value=0xbfffb21c)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute.c:977
#12 0x404b455b in zend_assign_to_variable (result=0x820f8f8, op1=0x820f908,
    op2=0x820f918, value=0xbfffb21c, type=2, Ts=0xbfffad4c)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute.c:338
#13 0x404aecd2 in execute (op_array=0x8332fcc)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute.c:1378
#14 0x404b2157 in execute (op_array=0x82928f4)
    at /root/source/php4-STABLE-200404060830/Zend/zend_execute.c:2200
#15 0x4049c3f0 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /root/source/php4-STABLE-200404060830/Zend/zend.c:889
#16 0x40460ec9 in php_execute_script (primary_file=0xbffff8d0)
    at /root/source/php4-STABLE-200404060830/main/main.c:1731
#17 0x404b6727 in php_handler (r=0x823c148)
    at /root/source/php4-STABLE-200404060830/sapi/apache2handler/sapi_apache2.c:561
#18 0x08082439 in ap_run_handler (r=0x823c148) at config.c:194
#19 0x08082983 in ap_invoke_handler (r=0x823c148) at config.c:401
#20 0x0806c633 in ap_internal_redirect (
    new_uri=0x823c0f8 "/thimbletoys_com/application/category/browse.php?c=17&p=&n=Cooking/Kochen", r=0x81c9e78) at http_request.c:498
#21 0x0807bd4b in handler_redirect (r=0x81c9e78) at mod_rewrite.c:1729
#22 0x08082439 in ap_run_handler (r=0x81c9e78) at config.c:194
#23 0x08082983 in ap_invoke_handler (r=0x81c9e78) at config.c:401
#24 0x0806c126 in ap_process_request (r=0x81c9e78) at http_request.c:288
#25 0x0806819a in ap_process_http_connection (c=0x81bb658) at http_core.c:293
#26 0x0808b518 in ap_run_process_connection (c=0x81bb658) at connection.c:85
#27 0x0808b7bc in ap_process_connection (c=0x81bb658, csd=0x81bb580)
    at connection.c:211
#28 0x08081110 in child_main (child_num_arg=0) at prefork.c:694
#29 0x080811cc in make_child (s=0x80c0770, slot=0) at prefork.c:734
#30 0x080812c1 in startup_children (number_to_start=5) at prefork.c:806
#31 0x080815bc in ap_mpm_run (_pconf=0x80bde98, plog=0x80f5f78, s=0x80c0770)
    at prefork.c:1022
#32 0x08086c4e in main (argc=2, argv=0xbffffda4) at main.c:660

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 [2004-04-06 05:39 UTC] s dot dehaan at lobbes dot biz 
The warning PHP prints is the following: 

Warning: String is not zero-terminated (ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ?̏*) (source: /root/source/php4-STABLE-200404060830/Zend/zend_execute.c:341)
 [2004-04-06 06:25 UTC] alan_k@php.net 
Do you have the zend optimizer running?? = there are known problems with this.
 [2004-04-06 07:17 UTC] s dot dehaan at lobbes dot biz 
No, it's just the default PHP installation from http://snaps.php.net, php_info() says it's 4.3.6RC3-dev but i've seen this bug since i upgraded to 4.3.5 from 4.3.4.

Here's my installation config:

'./configure' '--with-apxs2=/usr/local/apache2/bin/apxs' '--disable-cgi' '--enable-safe-mode' '--with-openssl' '--with-pear' '--with-zlib' '--enable-bcmath' '--enable-calendar' '--with-curl=/usr/local/curl' '--enable-dba' '--enable-dbase' '--with-dom=/usr/local' '--with-dom-xslt=/usr/local' '--with-dom-exslt=/usr/local' '--enable-ftp' '--with-gd' '--with-jpeg-dir=/usr' '--with-png-dir=/usr' '--with-ttf=/usr' '--enable-gd-native-ttf' '--with-mcrypt' '--with-mhash' '--with-mysql' '--enable-wddx' '--enable-xslt' '--with-xslt-sablot=/usr/local' '--enable-exif' '--with-freetype-dir=/usr/local' '--with-xmlrpc' '--with-gettext' '--with-imap=../imap-2002e' '--enable-shmop' '--enable-debug'
 [2004-04-07 05:09 UTC] sniper@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

And make SURE you don't have ANY extensions (php or zend) loaded in you php.ini (try running the script with CLI binary, e.g. # php -n test.php )
 [2004-04-07 05:48 UTC] s dot dehaan at lobbes dot biz 
I am unable to recreate the bug so I think it's fixed! Thanks!
I ran the test using CLI php -n & no extensions loaded in php.ini 

Thanks again.
 
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