Re: /proc filesystem allows bypassing directory permissions on Linux

[Dan Yefimov <dan@xxxxxxxxxxxxxxxx>]

On 24.10.2009 20:59, Anton Ivanov wrote:
> > Not to tell about
> > that /proc/<PID>/fd/ contains only symbolic links, not files, so I can't
> > understand, how the original reporter managed to gain access to the file in the
> > restricted directory using that symlink.
>
> The perms are definitely broken and without a code audit on procfs I
> would not bet that this is limited just to this rather obscure test
> case.
>
> To be honest, I hope that it is limited to this rather obscure test
> case. If it is not there may be entertaining ramifications.
Given my citation above (I personally use Linux), that obscure test case looks 
doubtful. If the original reporter uses some patched kernel, that doesn't matter 
others.
--

Sincerely Your, Dan.