Re: [PATCH 1/6] SELinux: change Kconfig to use select instead of depends

[Randy Dunlap <randy.dunlap@oracle.com>]

Stephen Smalley wrote:
> On Tue, 2007-10-09 at 16:28 -0700, Randy Dunlap wrote:
> > On Wed, 10 Oct 2007 09:19:55 +1000 (EST) James Morris wrote:
> >
> > > From: Eric Paris <eparis@redhat.com>
> > >
> > > Changes the security/selinux/Kconfig to use select instead of depends
> > > for most of the SELinux requirements.  This allows the SELinux option to
> > > show up when people do a make config without already knowing they had to
> > > enable audit and other non-obvious choices.  Added a depends on SECURITY
> > > (which previously existed through SECURITY_NETWORK) so that SELinux
> > > would not always show up, but would be easy and intuitive to find.
> > >
> > > Signed-off-by: Eric Paris <eparis@redhat.com>
> > > Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
> > > Signed-off-by: James Morris <jmorris@e.namei>
> > > ---
> > >  security/selinux/Kconfig |    7 ++++++-
> > >  1 files changed, 6 insertions(+), 1 deletions(-)
> > >
> > > diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig
> > > index b32a459..40b97e6 100644
> > > --- a/security/selinux/Kconfig
> > > +++ b/security/selinux/Kconfig
> > > @@ -1,6 +1,10 @@
> > >  config SECURITY_SELINUX
> > >  	bool "NSA SELinux Support"
> > > -	depends on SECURITY_NETWORK && AUDIT && NET && INET
> > > +	depends on SECURITY
> > > +	select SECURITY_NETWORK
> > > +	select AUDIT
> > > +	select NET
> > > +	select INET
> > >  	select NETWORK_SECMARK
> > >  	default n
> > >  	help
> > I doth protest.  Enabling the entire NET subsystem thru a hidden
> > select is awful.  Select should be used (sparingly) to enable
> > library code only.  If someone wants NET enabled, they should
> > enable it overtly, not covertly.
>
> Does that apply to all the options, or only to NET (e.g. is it ok to
> select AUDIT)?  I thought that this patch came out of earlier
> discussions about proper use of select vs. depends.  It may have gone
> too far, but I'm not sure it should be discarded entirely.

AUDIT isn't quite library code, still I don't have a (big) problem with
selecting it or NETWORK_SECMARK.  (other than select is evil :)

OTOH, NET and INET are large config options, not library-like code, and
should not be selected.

--
~Randy
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