Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <c1a32f5d-c15d-8127-6254-69946f751bdb@linux.ibm.com>
Date:   Wed, 16 Feb 2022 16:19:19 -0500
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101
 Thunderbird/91.5.0
Subject: Re: [PATCH v10 06/27] ima: Move arch_policy_entry into ima_namespace
Content-Language: en-US
To:     Mimi Zohar <zohar@linux.ibm.com>, linux-integrity@vger.kernel.org
Cc:     serge@hallyn.com, christian.brauner@ubuntu.com,
        containers@lists.linux.dev, dmitry.kasatkin@gmail.com,
        ebiederm@xmission.com, krzysztof.struczynski@huawei.com,
        roberto.sassu@huawei.com, mpeters@redhat.com, lhinds@redhat.com,
        lsturman@redhat.com, puiterwi@redhat.com, jejb@linux.ibm.com,
        jamjoom@us.ibm.com, linux-kernel@vger.kernel.org,
        paul@paul-moore.com, rgb@redhat.com,
        linux-security-module@vger.kernel.org, jmorris@namei.org,
        Christian Brauner <brauner@kernel.org>
References: <20220201203735.164593-1-stefanb@linux.ibm.com>
 <20220201203735.164593-7-stefanb@linux.ibm.com>
 <bf435ffa5d176213acabb8c576c159d2cbd4d395.camel@linux.ibm.com>
 <c350ccf1-f968-8b01-2f0d-015cabf39781@linux.ibm.com>
 <c4170de11d64d5927a8e2a2e0f7e8a6e69c6a558.camel@linux.ibm.com>
From:   Stefan Berger <stefanb@linux.ibm.com>
In-Reply-To: <c4170de11d64d5927a8e2a2e0f7e8a6e69c6a558.camel@linux.ibm.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk


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
>
>