linux-kernel - Re: [RFC v2 2/7] keys: initialize root uid and session keyrings early

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Date:	Fri, 17 Aug 2012 14:27:34 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Josh Boyer <jwboyer@...il.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>, jmorris@...ei.org,
	rusty@...tcorp.com.au, dhowells@...hat.com,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, Mimi Zohar <zohar@...ibm.com>
Subject: Re: [RFC v2 2/7] keys: initialize root uid and session keyrings early

Mimi Zohar <zohar@...ux.vnet.ibm.com> writes:

> On Thu, 2012-08-16 at 15:59 -0400, Josh Boyer wrote:
>> On Thu, Aug 16, 2012 at 3:45 PM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>> > On Thu, 2012-08-16 at 15:13 -0400, Josh Boyer wrote:
>> >> On Thu, Aug 16, 2012 at 3:08 PM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:
>> >> >> > +#include "internal.h"
>> >> >> > +static int __init init_root_keyring(void)
>> >> >> > +{
>> >> >> > +       return install_user_keyrings();
>> >> >> > +}
>> >> >> > +
>> >> >> > +late_initcall(init_root_keyring);
>> >> >> > --
>> >> >>
>> >> >> Why is this in an entirely new file instead of just being added to
>> >> >> process_keys.c ?
>> >> >>
>> >> >> josh
>> >> >
>> >> > Only when "CONFIG_INTEGRITY_SIGNATURE" is selected, does this get built.
>> >>
>> >> Yes, I noticed that.  It doesn't explain why it's in its own file.  You
>> >> could accomplish the same thing by wrapping the function and initcall
>> >> in #ifdef CONFIG_INTEGRITY_SIGNATURE in process_keys.c.
>> >
>> > I was under the impression using 'ifdefs' in 'C' code was frowned upon
>> > (Documentation/SubmittingPatches section 2.2).  This would be an
>> > exception?
>> 
>> If it makes a big ugly mess it's frowned upon.  But if you're adding 7
>> lines of code in a new file that will almost certainly never get more
>> code added to it, I'm not sure.  IMHO, it can go into an existing file.
>> Others might disagree.  Isn't Linux development fun?!
>
> This is just a case where if I had 'ifdef's in 'C' code, I'm sure
> someone would have complained.  :)

Why does the code need to be dependent on security modules at all.  The
code should work regardless either way.

Eric
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