WordPress "Must-Use" Tutorials» known issues

Multisite upload limit bug in 3.3

andrea — Wed, 14 Dec 2011 01:39:18 +0000

Turns out there’s a wee bug in multisite in 3.3 with the upload limits. If you;re limiting upload space on user’s sites, it gets stuck at 50mb.

Patch is here in the meantime.

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Proposed change for ms-files.php & image handling

andrea — Tue, 15 Nov 2011 14:32:09 +0000

This trac ticket has been tagged for 3.4 which is quite a while away from happening. Basically, the current way multisite handles images on the sub sites, is by running every request through a file called ms-files.php. This can actually be overridden via the sunrise.php file.

The proposed change would involve moving new sub site images into wp-content/uploads/sites/ where it makes much more sense. I’ve seen a lot of confusion over the blogs.dir folder and image rewrite rules.

This would also be handled in such a way that your current image uploads would not suddenly break. That would be a nightmare.

If you have worked extensively in this are of multisite, please chime in on the trac ticket.

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Post tags: images, improvement, multisite, porposed, trac

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Rewrites

Ron — Mon, 18 Oct 2010 14:00:00 +0000

Found a rewrite loop issue for subfolder installs – my explanation on the ticket. Basically if a file under wp-content is requested and not found, Apache goes into a rewrite loop.

Anyone with MU or a 3.0 network can fix their .htaccess files.

Existing rewrite rule you may have in 3.0:

RewriteRule (^[_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L] RewriteRule (^[_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]

Or if you upgraded from MU it looks like this:
RewriteRule (^[_0-9a-zA-Z-]+/)?(wp-.*) $2 [L] RewriteRule (^[_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]

Fixed version:
RewriteRule ^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*) $1 [L] RewriteRule ^[_0-9a-zA-Z-]+/(.*\.php)$ $1 [L]

Just do a straight up replace of those lines.

If you have a subdomain install, you do not need to do this. If you have these rules, you can actually remove them.

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Did your user’s theme options and widgets page disappear?

andrea — Mon, 05 Jul 2010 18:15:46 +0000

Well here’s a little bug that was discovered, though it’s not really a bug in WordPress itself, rather a change. It shows up in themes with higher-level capabilities attached to certain menu items.

In 3.0, this was made more stringent with the merge. the theme editor was left in with only Super Admins having access to it. Regular site administrators should not have access.

Some themes, however, have additional menu items (options pages) that use the capability edit_themes to access.

If you find this is happening to you, just search the theme’s functions.php file and change the edit_themes cap to edit_themes_options. That should fix it.

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Bug affecting XMLRPC

Ron — Sat, 10 Jan 2009 03:39:33 +0000

There is some dispute as to who owns the bug. Some feel the developers behind PHP should address it while others feel that the libxml developers should resolve it. I’m not really interested in getting into that argument.

The low-down on the bug is that libxml 2.7.X has been rolled out into major linux distros like Cent-OS 5, Fedora 9 & Red Hat. (The only 2 current distros that I was able to find that have not gone past libxml 2.6.32 are Debian Etch and Ubuntu.) Although I did not research it, earlier versions of the distros like Cent-OS 4 & Fedora 8 probably have not rolled in libxml 2.7.X. When the current stable version of PHP 5 is compiled with libxml 2.7.X, the < and > signs get stripped out of html posted via XMLRPC. For example

<p>Hello world!</p>

normally would get translated to

Hello world!

with the bug it gets translated to

pHello world!/p

If you are on a shared host, there probably is not a great deal you are going to be able to do about this other than weather the storm, so to speak. Most likely at some point you will encounter this bug if your shared host is on one of the OS’s mentioned above. At the same time, the shared host ISPs will be under some pressure to find a solution because the bug affects all version of both WP & WPMU that support posting to a blog via XMLRPC.

If you are on a VPS, you can check your current libxml version by creating a php file on your website containing

and then load the php file in your web browser. Once loaded you can scroll down to a block that is titled libxml. Your libxml version is listed there. Versions up to 2.6.32 have tested ok for the html parsing. If your version is less than that then the best course of action over the next couple months is to NOT rebuild PHP.

There is a patch available. I haven’t tried the patch and cannot vouch for it. On a manged VPS you may encounter difficulty in applying the patch (depending on the degree of control the VPS maintains on sources).

I researched this bug as a result of one of our clients having PHP recompiled on their Cent-OS 5 VPS in the last few weeks. If you are looking to set up a VPS in the next couple months, I would recommend that you steer clear of Cent-OS 5 VPS’s.

Updated to add: Joseph Scott was one of the WP devs who worked on tracking down and testing libxml versions for the issue. He has lots of additional links on the bug here.

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Upgrade to WPMU 2.6.1

andrea — Tue, 02 Sep 2008 18:54:07 +0000

Unlike the upgrade between regular WordPress from 2.6 to 2.6.1 being non-urgent, this upgrade for WPMU *is* required if you’re on 2.6. One reason is it fixes a really nasty bug with deleting blogs.

You can check the trac timeline to see exactly what was fixed & changed.

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Post tags: 2.6.1, new release, upgrade

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Check your install for unfiltered_html

andrea — Wed, 12 Mar 2008 18:09:41 +0000

Just before the last release, the check for unfiltered_html snuck back into the code base for MU. This means that if you’re using code since then, your users can insert malicious code into your site.

Please read this forum post from Donncha for more details. You can update the wp-admin/includes/schema.php so new blogs won’t have this, and Donncha has provided a plugin to strip it off any blogs that may be using it.

It is very important that you check your codebase for this.

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MU version 1.3.3 has object cache issues

andrea — Wed, 20 Feb 2008 20:41:58 +0000

Seems the latest version is a wee bit broken in the cache area. It’s an older problem that was previously fixed, but soemhow slipped through again. It happens. Check the trac ticket here on the issue and the fix here.

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