>> can you show permission set for /usr, /usr/squirrelmail, and
>> /usr/squirrelmail/data?  otherwise, I am throwing my hands up.  this
>> is the simplest of simple errors and should not be this hard to track
>> down.  maybe get another set of eyes to look at it in person.  maybe
>> php's umask is b0rked or something weird.  who knows.
>>
> Permissions of the /usr, /usr/squirrelmail and /usr/squirrelmail/data
>
> drwxr-xr-x   15 root root   4096 Dec 22 15:44 usr
> drwxr-xr-x    3 root root  4096 Dec 22 15:44 squirrelmail
> drwxrwxrwx  2 apache apache 4096 Dec 21 22:53 data
>
> If you can't think of anything else.  I'll see if I can find someone to
> look at it.  I'll try uninstalling and reinstalling PHP and see if
> anything in that had gotten messed up somehow.  I can't think of
> anything besides some kind of bizzare problem.

Have you checked safe_mode settings? not in php.ini. in output of
phpinfo() function that is run same way squirrelmail scripts are run. from
same directory as squirrelmail scripts.

Have you read http://www.php.net/features.safe-mode

Functions restricted/disabled by safe mode
...

copy()

Checks whether the files or directories you are about to operate on have
the same UID (owner) as the script that is being executed. Checks whether
the directory in which you are about to operate has the same UID (owner)
as the script that is being executed. (on source and target)

You can have world writable file, but safe mode will block writting into
that file, if it is not owned by same user that owns script used to write
to a file.


Some days ago people also talked about SE Linux patches that were added to
Fedora. Are you sure that you don't have SE Linux access controls
installed.

-- 
Tomas


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