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Message-ID: <77ea263c-4200-eb74-24b2-9a8155aff9b5@digikod.net>
Date: Wed, 14 Oct 2020 20:52:08 +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 20:07, 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.

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