[wp-trac] [WordPress Trac] #11903: insert_with_markers is not threadsafe

[WordPress Trac]

#11903: insert_with_markers is not threadsafe
--------------------------+-------------------------------------------------
 Reporter:  strings28     |       Owner:  ryan       
     Type:  defect (bug)  |      Status:  new        
 Priority:  normal        |   Milestone:  3.0        
Component:  Permalinks    |     Version:  2.9        
 Severity:  major         |    Keywords:  needs-patch
--------------------------+-------------------------------------------------
Description changed by Denis-de-Bernardy:

Old description:

> From wp-admin/includes/misc.php the function insert_with_markers may be
> called multiple times on a busy server and if the htaccess is already in
> the process of being written it is possible that two PHP threads could
> attempt to write to it causing corruption such as the following:
>

> # BEGIN WordPress
> <IfModule mod_rewrite.c>
> RewriteEngine On
> RewriteBase /
> RewriteCond %{REQUEST_FILENAME} !-f
> RewriteCond %{REQUEST_FILENAME} !-d
> RewriteRule . /index.php [L]
> </IfModule>
>
> # END WordPress
> s
>
> Notice the dangling 's' at the last line

New description:

 From wp-admin/includes/misc.php the function insert_with_markers may be
 called multiple times on a busy server and if the htaccess is already in
 the process of being written it is possible that two PHP threads could
 attempt to write to it causing corruption such as the following:



 {{{
 # BEGIN WordPress
 <IfModule mod_rewrite.c>
 RewriteEngine On
 RewriteBase /
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule . /index.php [L]
 </IfModule>

 # END WordPress
 s

 }}}

 Notice the dangling 's' at the last line

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Ticket URL: <http://core.trac.wordpress.org/ticket/11903#comment:4>
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