ID: 38577
Updated by: [email]tony2001@php.net[/email]
Reported By: php at diptyque dot net
-Status: Open
+Status: Bogus
Bug Type: Apache related
Operating System: FreeBSD 4.4
PHP Version: 4.4.4
New Comment:

See bug #38670 and bug #38566.
Please use bug #38760 for further comments.


Previous Comments:
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[2006-09-08 09:02:47] php at diptyque dot net

I'm not trying anything. You told me to download and install
the latest CVS snapshot. That's what I did but the erratic
function overloading behavior is still there. Considering no
drastic changes have been made since v4.4.4 either at the
Apache SAPI level (mod_php4.c) or in Mbstring (mbstring.c)
source code, this isn't very surprising.

Regarding Xdebug, this particular extension also overrides
two core functions -- namely var_dump() and set_time_limit
(). Don't you think it would be interesting to know if the
function overloading that Xdebug performs is sticky or not
when running under the Apache 1.3 SAPI?

I have the strong feeling that the original PHP function
table state is not restored properly by Mbstring but I don't
have the time nor the resources needed to nail down further
the origin of the leak -- i.e. the overridden functions
stickiness or whatever you may call it.

------------------------------------------------------------------------

[2006-09-07 16:48:46] [email]tony2001@php.net[/email]

I'm not sure I understand what you're trying to do and to say.

------------------------------------------------------------------------

[2006-09-07 16:39:49] php at diptyque dot net

FYI, I do *NOT* have any Zend or Xdebug extension
installed... I have downloaded Xdebug only to compare its
overriding technique with the one used in Mbstring
extension.

=begin
[diptyque] % php -m
[PHP Modules]
bz2
ctype
curl
gd
imap
mbstring
mysql
openssl
overload
pcre
posix
readline
session
sqlite
standard
tokenizer
xml
zlib

[Zend Modules]
=end

BTW, I compared source files for apache SAPI
(./sapi/apache/mod_php4.c) and mbstring extension
(./ext/mbstring/mbstring.c) between version 4.4.4 and
latest stable version and did not find anything different
(!?)

------------------------------------------------------------------------

[2006-09-07 15:25:39] tony2001@php.net

Please remove all zend_extensions, including XDebug and try again.

------------------------------------------------------------------------

[2006-09-07 15:14:49] php at diptyque dot net

Antony, I'm not very familiar with Zend Engine 1.3 innards
but I had a look at how Xdebug is overriding both
var_dump() and set_time_limit() functions in
PHP_RINIT_FUNCTION(xdebug) and how it does restore the
original function pointers in
PHP_RSHUTDOWN_FUNCTION(xdebug). Peeking at mbstring
extension source code, this looks a bit more verbose and it
doesn't fiddle directly with
orig->internal_function.handler (!?) to restore the
original function. Instead it calls subsequently
zend_hash_update() and zend_hash_del() using the info it
gathered inside its mb_overload_def struct... IMHO,
mbstring ini settings are properly reset (please see
http://bugs.php.net/bug.php?id=25753) but not the initial
PHP function table state.

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The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/38577

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