linux-kernel - Re: [PATCH v21 07/12] landlock: Support filesystem access-control

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Message-ID: <b311a2a6-5290-5c50-3a9c-4d5b54b6b406@digikod.net>
Date:   Wed, 14 Oct 2020 21:13:42 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     James Morris <jmorris@...ei.org>
Cc:     linux-kernel@...r.kernel.org,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Richard Weinberger <richard@....at>,
        Andy Lutomirski <luto@...capital.net>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        Casey Schaufler <casey@...aufler-ca.com>,
        Jann Horn <jannh@...gle.com>, Jeff Dike <jdike@...toit.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
        kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-security-module@...r.kernel.org, x86@...nel.org,
        Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v21 07/12] landlock: Support filesystem access-control


On 14/10/2020 20:52, Mickaël Salaün wrote:
> 
> On 14/10/2020 20:07, James Morris wrote:
>> On Thu, 8 Oct 2020, Mickaël Salaün wrote:
>>
>>> +config ARCH_EPHEMERAL_STATES
>>> +	def_bool n
>>> +	help
>>> +	  An arch should select this symbol if it does not keep an internal kernel
>>> +	  state for kernel objects such as inodes, but instead relies on something
>>> +	  else (e.g. the host kernel for an UML kernel).
>>> +
>>
>> This is used to disable Landlock for UML, correct?
> 
> Yes
> 
>> I wonder if it could be 
>> more specific: "ephemeral states" is a very broad term.
>>
>> How about something like ARCH_OWN_INODES ?
> 
> Sounds good. We may need add new ones (e.g. for network socket, UID,
> etc.) in the future though.
> 

Because UML is the exception here, it would be more convenient to keep
the inverted semantic. What about ARCH_NO_OWN_INODES or
ARCH_EPHEMERAL_INODES?