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

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

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@...radead.org>

Download attachment "config-r8835.gz" of type "application/gzip" (37123 bytes)