#45751 [NEW]: Php crashes when using auto_prepend_file (out of scope stack address use).

From:             basant dot kukreja at sun dot com
Operating system: Solaris 10
PHP version:      5.2.6
PHP Bug Type:     Reproducible crash
Bug description:  Php crashes when using auto_prepend_file (out of scope stack address use).

Description:
------------
Stack pointer &execute_data.opline (&EG(opline)) is used beyond the scope
and hence crashes php with auto_preprend_file.

I wrote a small test plugin : test.c and then loaded the plugin into php
using php.ini
extension=test.so

$ ./sapi/cli/php -d "auto_prepend_file=inc.inc" -d
"include_path=/opt2/coolstackbld/svn/CoolStackDev/src/php5/php-5.2.6/tests/lang"
-f /tmp/test.php
Included!
Segmentation Fault (core dumped)


Reproduce code:
---------------
Test plugin location : (skydrive) :
http://yqaghq.blu.livefilestore.com/y1phzvjT69U9PiUNjW9NjakZZ5It3VOAEhADJusnkoorLiwGfeVlK6zTz-8AprvloPplXlNkaHUYD9sS9idFWZhcg/test.c?download

Expected result:
----------------
Normal behaviour

Actual result:
--------------
php crashes

$ pstack core
core 'core' of 23827:   ./sapi/cli/php -d auto_prepend_file=inc.inc -d
include_path=/opt2/cool
 003b8e4c zend_get_executed_lineno (5be8a0, 5897c, ffe39448, 55570c,
ff1531c0, 57400) + 3c
 003d9f78 zend_execute_scripts (8, 0, 3, 1, 2, 5763c) + 11c
 0032d9bc php_execute_script (ffffffff, ffbff2cd, 5be3e0, ffbfefe0, 0,
5ae3a0) + 2b0
 0048e5e4 main     (10000, 5addc8, 2d, 2f, 48cac0, 1ac0) + 1ae4
 000a8f28 _start   (0, 0, 0, 0, 0, 0) + 108

 Debugger showed that it was crashing in line 394 of zend_execute_API.c :
391  ZEND_API uint zend_get_executed_lineno(TSRMLS_D)
392  {
393  	if (EG(opline_ptr)) {
394  		return active_opline->lineno;

EG(online_ptr) points to arbitrary value ( a pointer value in stack) and
it
crashes in active_opline->lineno.
active_opline->lineno is *EG(opline_ptr)


We found this issue when php was crashing while dtrace plugin was loaded
:
$ ./sapi/cli/php -d "auto_prepend_file=inc.inc" -d
"include_path=/opt2/coolstackbld/svn/CoolStackDev/src/php5/php-5.2.6/tests/lang"
-f /tmp/test.php

To simpilfy thing, I wrote my test plugin and reproduced the crash.



-- 
Edit bug report at http://bugs.php.net/?id=45751&edit=1
-- 
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45751&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45751&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45751&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=45751&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=45751&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=45751&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=45751&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=45751&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=45751&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=45751&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=45751&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=45751&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=45751&r=globals
PHP 4 support discontinued:   http://bugs.php.net/fix.php?id=45751&r=php4
Daylight Savings:             http://bugs.php.net/fix.php?id=45751&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=45751&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=45751&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=45751&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=45751&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=45751&r=mysqlcfg