Python Django Latex Permissions Problem

[I-T]

I have a python/django webapp running with apache2. It executes system
commands for getting a pdf generated by pdflatex from a .tex file and
a couple of image files which it also generates.

The permssions from ls-l for all the created files is:-
-rw-r--r-- 1 www-data www-data

The files are being created in /tmp/pdfscratch{id} created from the
script and so is the directory.

pdflatex fails with the following error message:-

This is pdfTeXk, Version 3.141592-1.40.3 (Web2C  7.5.6)
 %&-line parsing enabled.
entering extended mode
! I can't write on file `uber.log'.
Please type another transcript file name:
! Emergency stop
!  ==> Fatal error occurred, no output PDF file  produced!

Its supposed to write to this directory. I have a feeling that
pdflatex is trying to generate files using some weird access
credentials that dont have access to /tmp/pdfscratch{id}

What do you guys think could be the problem/solution

Thanks in advance