linux-kernel - Re: [RFC v2 19/19] ima: Setup securityfs for IMA namespace

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Date:   Fri, 3 Dec 2021 19:33:39 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     jejb@...ux.ibm.com, linux-integrity@...r.kernel.org
Cc:     zohar@...ux.ibm.com, 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, jamjoom@...ibm.com,
        linux-kernel@...r.kernel.org, paul@...l-moore.com, rgb@...hat.com,
        linux-security-module@...r.kernel.org, jmorris@...ei.org
Subject: Re: [RFC v2 19/19] ima: Setup securityfs for IMA namespace


On 12/3/21 14:11, Stefan Berger wrote:
>
> On 12/3/21 13:50, James Bottomley wrote:
>
>
>>
>>> Where would the vfsmount pointer reside? For now it's in
>>> ima_namespace, but it sounds like it should be in a more centralized
>>> place? Should it also be  connected to the user_namespace so we can
>>> pick it up using get_user_ns()?
>> exactly.  I think struct user_namespace should have two elements gated
>> by a #ifdef CONFIG_SECURITYFS which are the vfsmount and the
>> mount_count for passing into simple_pin_fs.
>
> Also that we can do for as long as it flies beyond the conversation 
> here... :-) Anyone else have an opinion ?

I moved it now and this greatly reduced the amount of changes. The 
dentries are now all in the ima_namespace and it works with one API. Thanks!

I wonder whether to move the integrity dir also into the ima_namespace. 
It's generated in integrity/iint.c, so not in the IMA territory... For 
the IMA namespacing case I need to create it as well, though.

https://elixir.bootlin.com/linux/latest/source/security/integrity/iint.c#L218

    Stefan