dos2unix, mac2unix and unix2dos don't preserve permissions.

Steps to reproduce:

$ cd /tmp

$ touch dos2unix.test
$ ls -l dos2unix.test
-rw-r--r--  1 user users 0 2005-09-28 23:38 dos2unix.test
$ dos2unix dos2unix.test
$ ls -l dos2unix.test
-rw-------  1 user users 0 2005-09-28 23:39 dos2unix.test

$ touch mac2unix.test
$ ls -l mac2unix.test
-rw-r--r--  1 user users 0 2005-09-28 23:40 mac2unix.test
$ mac2unix mac2unix.test
$ ls -l mac2unix.test
-rw-------  1 user users 0 2005-09-28 23:40 mac2unix.test

$ touch unix2dos.test
$ ls -l unix2dos.test
-rw-r--r--  1 user users 0 2005-09-28 23:41 unix2dos.test
$ unix2dos unix2dos.test
$ ls -l unix2dos.test
-rw-------  1 user users 0 2005-09-28 23:42 unix2dos.test

Fedora has a patch for it. There are also some other patches in their src.rpm,
some of which might be useful.

http://download.fedora.redhat.com/pub/fedora/linux/core/4/SRPMS/dos2unix-3.1-24.src.rpm
http://download.fedora.redhat.com/pub/fedora/linux/core/4/SRPMS/unix2dos-2.2-26.src.rpm