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Date: Mon, 03 Aug 2009 14:52:07 +1000
To: jani.taskinen@iki.fi, Jani Taskinen <jani.taskinen@sci.fi>
Cc: Rasmus Lerdorf <rasmus@lerdorf.com>, internals@lists.php.net
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Subject: Re: [PHP-DEV] fopen_wrappers.c DOCUMENT_ROOT .htaccess error
From: daniel@zoltak.com

>> Jani Taskinen wrote:
[snip]
>>> You obviously do not have the correct sources then.
>>> Try get them directly using SVN:
>>>
>>> # svn co http://svn.php.net/repository/php/php-src/branches/PHP_5_2/
>>>
>>> And if those don't work either, you need to provide a GDB backtrace, the
>>> strace is useless for this. Also make sure you configure PHP using
>>> --enable-debug !!

I have compile both apache and php using debug and run gdb with the =20
following result:

#0  0x00007f3e96df82eb in ?? () from /usr/lib64/apache2/modules/libphp5.so
#1  0x00007f3e96dfb085 in zend_hash_find () from =20
/usr/lib64/apache2/modules/libphp5.so
#2  0x00007f3e96d9229c in custom_open_base_check () from =20
/usr/lib64/apache2/modules/libphp5.so
#3  0x00007f3e96d90c56 in php_check_specific_open_basedir () from =20
/usr/lib64/apache2/modules/libphp5.so
#4  0x00007f3e96d9107f in php_check_open_basedir_ex () from =20
/usr/lib64/apache2/modules/libphp5.so
#5  0x00007f3e96d90fd4 in php_check_open_basedir () from =20
/usr/lib64/apache2/modules/libphp5.so
#6  0x00007f3e96d86adb in ?? () from /usr/lib64/apache2/modules/libphp5.so
#7  0x00007f3e96e05346 in zend_alter_ini_entry_ex () from =20
/usr/lib64/apache2/modules/libphp5.so
#8  0x00007f3e96e0511c in zend_alter_ini_entry () from =20
/usr/lib64/apache2/modules/libphp5.so
#9  0x00007f3e96e77ded in apply_config () from =20
/usr/lib64/apache2/modules/libphp5.so
#10 0x00007f3e96e77033 in ?? () from /usr/lib64/apache2/modules/libphp5.so
#11 0x0000000000436633 in ap_run_handler ()
#12 0x0000000000439511 in ap_invoke_handler ()
#13 0x00000000004430b4 in ap_process_request ()
#14 0x0000000000440706 in ?? ()
#15 0x000000000043ceb4 in ap_run_process_connection ()
#16 0x0000000000446db7 in ?? ()
#17 0x0000000000447012 in ?? ()
#18 0x00000000004470ac in ?? ()
#19 0x0000000000447cc8 in ap_mpm_run ()
#20 0x0000000000425ab3 in main ()

The function custom_open_base_check() contains:

// Document root from Zend (pointer to pointer)
zval **document_root =3D NULL;

// Make sure DOCUMENT_ROOT is accessible from the global vars
if (!PG(http_globals)[TRACK_VARS_SERVER] ||
         zend_hash_find(PG(http_globals)[TRACK_VARS_SERVER]->value.ht, =20
"DOCUMENT_ROOT",
sizeof("DOCUMENT_ROOT"), (void **) &document_root) =3D=3D FAILURE) {

         // Unable to find DOCUMENT_ROOT
         php_error_docref(NULL TSRMLS_CC, E_WARNING, =20
"fopen_wrapper_patch: DOCUMENT_ROOT variable
is not set, cannot determine document root.");

         // Can't check the document root - fail
         return -1;
}

It crashing when its looking up the DOCUMENT_ROOT in the =20
zend_hash_find. This only occurs when the following is defined in an =20
.htaccess and with the custom function in place:

[snip]
php_value error_log '/home/st/stu/studio1.com.au/www/logs/php_err.log'

Is it safe to access the DOCUMENT_ROOT this way at this point in the =20
code? If not is there an alternative or is there something wrong =20
somewhere else in the code?

If you could guide me on how to produce the necessary output to debug =20
it would be much appreciated.

Thanks