linux-kernel - Re: [PATCH] ima: rework CONFIG

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Message-Id: <9065720e-5a5c-428a-a28d-a3337ac31f85@app.fastmail.com>
Date:   Wed, 27 Sep 2023 13:12:49 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Mimi Zohar" <zohar@...ux.ibm.com>,
        "Arnd Bergmann" <arnd@...nel.org>,
        "Dmitry Kasatkin" <dmitry.kasatkin@...il.com>
Cc:     "Paul Moore" <paul@...l-moore.com>,
        "James Morris" <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        "Jarkko Sakkinen" <jarkko@...nel.org>,
        "Nayna Jain" <nayna@...ux.ibm.com>,
        "Eric Snowberg" <eric.snowberg@...cle.com>,
        "Tianjia Zhang" <tianjia.zhang@...ux.alibaba.com>,
        "Randy Dunlap" <rdunlap@...radead.org>,
        "Oleksandr Tymoshenko" <ovt@...gle.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ima: rework CONFIG_IMA dependency block

On Wed, Sep 27, 2023, at 12:52, Mimi Zohar wrote:
> On Wed, 2023-09-27 at 09:22 +0200, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> Changing the direct dependencies of IMA_BLACKLIST_KEYRING and
>> IMA_LOAD_X509 caused them to no longer depend on IMA, but a
>> a configuration without IMA results in link failures:
>> 
>> arm-linux-gnueabi-ld: security/integrity/iint.o: in function `integrity_load_keys':
>> iint.c:(.init.text+0xd8): undefined reference to `ima_load_x509'
>> 
>> aarch64-linux-ld: security/integrity/digsig_asymmetric.o: in function `asymmetric_verify':
>> digsig_asymmetric.c:(.text+0x104): undefined reference to `ima_blacklist_keyring'
>> 
>> Adding explicit dependencies on IMA would fix this, but a more reliable
>> way to do this is to enclose the entire Kconfig file in an 'if IMA' block.
>> This also allows removing the existing direct dependencies.
>> 
>> Fixes: be210c6d3597f ("ima: Finish deprecation of IMA_TRUSTED_KEYRING Kconfig")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Oleksandr Tymoshenko's patch to address this, made it into linux-next
> today.
>
> Commit be210c6d3597 ("ima: Finish deprecation of IMA_TRUSTED_KEYRING
> Kconfig") made it last night into linux-next.

No, that is the patch that caused the regression for me, since it
is missing the IMA dependencies.

    Arnd