Re: [idea] udev + selinux

[Luke Kenneth Casson Leighton <lkcl@lkcl.net>]

On Tue, Aug 31, 2004 at 10:49:08AM +0100, Luke Kenneth Casson Leighton wrote:

> > Seeing as my initial /dev is on a persistent 
> > filesystem i don't have a problem with pre-udev stuff running.
> 
>  well.... you shouldn't... until you reinitialise or somehow delete,
>  upgrade or otherwise modify the "old" /dev [which you will find is
>  remounted --rbind to /.dev].
> 
>  try it: do setfiles /etc/selinux/src/file_contexts/file_contexts /.dev
>  and then reboot [in permissive mode!!!]
> 
>  due to the present files/types.fc, you will find that the entire
>  /.dev gets relabelled to something completely useless: root_t
>  or default_t.  i think it's default_t.
> 
>  consequently your next reboot in enforcing mode will fail because
>  /sbin/init tries to access /dev/null and /dev/initctl etc. as
>  default_t ... and it can't.
> 
>  should you choose to deal with this, replace /u?dev with /[\.u]dev or
>  some suitable regexp that i haven't a clue how to write so i just
>  did /.?u?dev and that did the trick.
 
 it's insufficient to add /.?u?dev to just file_contexts/types.fc
 you also have to search in file_contexts/program/* for /dev
 and set the right context there, too.

 there is i believe a bug at present in
 e.g. file_contexts/program/init.fc because it only covers
 /dev/initctl not /udev/initctl and not /.dev/initctl.

 i think this one is the only one that's really really critical
 [except on redhat of course where they all should be /u?dev]
 because if /.dev/initctl gets set to default_t, you're stuffed
 at next boot.

 l.



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