Re: linux-next: Tree for Apr 16 (IMA appraise causing build error)

From: Randy Dunlap <rdunlap@infradead.org>
To: Stephen Rothwell <sfr@canb.auug.org.au>,
	Linux Next Mailing List <linux-next@vger.kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-integrity@vger.kernel.org, Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>
Subject: Re: linux-next: Tree for Apr 16 (IMA appraise causing build error)
Date: Fri, 16 Apr 2021 11:53:53 -0700	[thread overview]
Message-ID: <80839e94-f72c-4d2c-6b3a-b68beea72a27@infradead.org> (raw)
In-Reply-To: <20210416213625.14542675@canb.auug.org.au>

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On 4/16/21 4:36 AM, Stephen Rothwell wrote:
> Hi all,
> 
> Changes since 20210415:
> 

I noticed this build error message (on an i386 build):

../certs/Makefile:52: *** Could not determine digest type to use from kernel config.  Stop.

and when I was checking on why it happened, I noticed that
# CONFIG_MODULES is not set

and hence
ifndef CONFIG_MODULE_SIG_HASH
$(error Could not determine digest type to use from kernel config)
endif

CONFIG_MODULE_SIG_HASH is not set/enabled/defined.

However, the .config file does have
CONFIG_IMA_APPRAISE=y
# CONFIG_IMA_ARCH_POLICY is not set
# CONFIG_IMA_APPRAISE_BUILD_POLICY is not set
CONFIG_IMA_APPRAISE_BOOTPARAM=y
CONFIG_IMA_APPRAISE_MODSIG=y

as well as
CONFIG_MODULE_SIG_FORMAT=y

due to a "select" by IMA_APPRAISE_MODSIG.
(although I see that MODULE_SIG_FORMAT does not depend on MODULES)

Is there anything that you can do (or recommend) to prevent
the build error?

BTW, it looks like this:
config IMA_APPRAISE_REQUIRE_MODULE_SIGS
	bool "Appraise kernel modules signatures"
	depends on IMA_APPRAISE_BUILD_POLICY

could also depend on MODULES.

Full i386 randconfig file is attached.

thanks.
-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>

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