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

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Date:	Wed, 10 Oct 2007 08:40:31 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
CC:	James Morris <jmorris@...ei.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] SELinux: change Kconfig to use select instead of
 depends

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@...hat.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@...hat.com>
>>> Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
>>> Signed-off-by: James Morris <jmorris@...amei>
>>> ---
>>>  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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