linux-kernel - Re: [PATCH 4/5] IMA: use obj-y for non-modular objects

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Date:   Thu, 25 Jul 2019 21:37:19 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 4/5] IMA: use obj-y for non-modular objects

On Fri, Jul 26, 2019 at 11:10:57AM +0900, Masahiro Yamada wrote:
> CONFIG_IMA is a boolean option, so none of these objects is linked
> into a module.
> 
> All the objects in this directory are compiled only when CONFIG_IMA=y
> since this directory is guarded by the parent Makefile:
> 
>   obj-$(CONFIG_IMA)                       += ima/
> 
> So, there is no point in creating the composite object, ima.o
> 
> Flatten the code into the obj-$(CONFIG_...) form.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
> 
>  security/integrity/ima/Makefile | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
> index d921dc4f9eb0..5517486c9154 100644
> --- a/security/integrity/ima/Makefile
> +++ b/security/integrity/ima/Makefile
> @@ -4,10 +4,8 @@
>  # Measurement Architecture(IMA).
>  #
>  
> -obj-$(CONFIG_IMA) += ima.o
> -
> -ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
> +obj-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
>  	 ima_policy.o ima_template.o ima_template_lib.o
> -ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
> -ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
> +obj-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
> +obj-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
>  obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
> -- 

This patch changes the kernel command line options

	ima.ahash_minsize
	ima.ahash_bufsize

to
	ima_crypto.ahash_minsize
	ima_crypto.ahash_bufsize

Intentional?

Note that these are documented in
Documentation/admin-guide/kernel-parameters.txt.

- Eric