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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?
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