linux-kernel - Re: [PATCH v10 06/27] ima: Move arch_policy_entry into ima

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Message-ID: <c1a32f5d-c15d-8127-6254-69946f751bdb@linux.ibm.com>
Date:   Wed, 16 Feb 2022 16:19:19 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc:     serge@...lyn.com, christian.brauner@...ntu.com,
        containers@...ts.linux.dev, dmitry.kasatkin@...il.com,
        ebiederm@...ssion.com, krzysztof.struczynski@...wei.com,
        roberto.sassu@...wei.com, mpeters@...hat.com, lhinds@...hat.com,
        lsturman@...hat.com, puiterwi@...hat.com, jejb@...ux.ibm.com,
        jamjoom@...ibm.com, linux-kernel@...r.kernel.org,
        paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org,
        Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v10 06/27] ima: Move arch_policy_entry into ima_namespace


On 2/16/22 15:56, Mimi Zohar wrote:
> On Wed, 2022-02-16 at 15:48 -0500, Stefan Berger wrote:
>> On 2/16/22 11:39, Mimi Zohar wrote:
>>> On Tue, 2022-02-01 at 15:37 -0500, Stefan Berger wrote
>>>
>>> Let's update the patch description providing a bit more background
>>> info:
>>>
>>> The archictecture specific policy rules, currently defined for EFI and
>>> powerpc, require the kexec kernel image and kernel modules to be
>>> validly signed and measured, based on the system's secure boot and/or
>>> trusted boot mode and the IMA_ARCH_POLICY Kconfig option being enabled.
>>>
>>>> Move the arch_policy_entry pointer into ima_namespace.
>>> Perhaps include something about namespaces being allowed or not allowed
>>> to kexec a new kernel or load kernel modules.
>> Namespaces are not allowed to kexec but special-casing the init_ima_ns
>> in the code to handle namespaces differently makes it much harder to
>> read the code. I would avoid special-casing init_ima_ns as much as
>> possible and therefore I have moved the arch_policy_entry into the
>> ima_namespace.
> Please include this in the patch description, but re-write the last
> line in the 3rd person, like:
>
> To avoid special-casing init_ima_ns, as much as possible, move the
> arch_policy_entry into the ima_namespace.

I took the paragraph on the background as well as this sentence.


>
> thanks,
>
> Mimi
>
>