Bug #69351 [Com]: recursive mkdir fails with parent (dot dot) directory in path and symlink
Edit report at https://bugs.php.net/bug.php?id=69351&edit=1
ID: 69351
Comment by: nemecek at wienfluss dot net
Reported by: dave2008 at buchananville dot net
Summary: recursive mkdir fails with parent (dot dot)
directory in path and symlink
Status: Open
Type: Bug
Package: Directory function related
PHP Version: 5.4.39
Block user comment: N
Private report: N
New Comment:
I was investigating this issue for a CMS we use and can confirm the problem for the following PHP
versions:
* 5.4.16
* 5.4.30
* 5.4.38
* 5.4.44
* 5.4.45
* 5.5.14
* 5.5.22
* 5.5.26
* 5.5.28
* 5.5.30
* 5.5.35
* 5.6.0
* 5.6.2
* 5.6.6
* 5.6.12
* 5.6.16
* 5.6.21
* 7.0.6
JFTR:
In the described test case, the call "mkdir('a/d/../e',0755,false);" would
correctly create the path.
Previous Comments:
------------------------------------------------------------------------
[2015-04-01 22:18:53] dave2008 at buchananville dot net
Description:
------------
Running recursive mkdir fails when there is a ".." directory in the path, and a symbolic
link is present:
mkdir('a/d/../e',0755,true);
The problem is that it is is expanding the path string in place instead of following the physical
filesystem. After it traverses into a/d, the ".." directory actually takes you somewhere
else. Not to "a". In bash this is like cd -P.
It worked like this in previous versions (at least on PHP 5.3.3 and before).
Where previous versions of PHP have acted this way, I think it is best for backwards compatibility
for this to work.
It looks like this was broken when the fix for bug #55124 was applied:
it made it use expand_filepath_with_mode() with the CWD_EXPAND. Maybe it should have used
CWD_REALPATH instead? Just a guess...
Test script:
---------------
<?php
mkdir('a/b/c',0755,true);
symlink('b/c','a/d');
chmod('a',0555);
mkdir('a/d/../e',0755,true);
Expected result:
----------------
On PHP 5.3.3 it runs with no output
Actual result:
--------------
PHP Warning: mkdir(): Permission denied in /var/autofs/home/dave/test-recursive-mkdir.php on line 7
------------------------------------------------------------------------
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