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From: James Morris <jmorris@namei.org>
To: Matthew Garrett <matthewgarrett@google.com>
Cc: linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org, Andy Lutomirski <luto@kernel.org>
Subject: Re: [RFC] Turn lockdown into an LSM
Date: Wed, 22 May 2019 12:40:55 +1000 (AEST)	[thread overview]
Message-ID: <alpine.LRH.2.21.1905221203070.3967@namei.org> (raw)
In-Reply-To: <20190521224013.3782-1-matthewgarrett@google.com>

On Tue, 21 May 2019, Matthew Garrett wrote:

> Hi James,
> 
> This is a quick attempt to integrate lockdown into the existing LSM
> framework. It adds a new lockdown security hook and an LSM that defines
> the existing coarse-grained policy, and also adds a new
> DEFINE_EARLY_LSM() definition in order to permit lockdown (and
> potentially other modules) to be initialised at the top of kernel init
> in order to allow policy to be imposed on stuff that happens in
> setup_arch(). The goal here is to allow policy to be devolved to other
> LSMs on systems that have a secure mechanism for loading LSM policy
> early in boot, allowing creation of arbitrarily complicated policies
> without interfering with the common-case coarse-grained approach.
> 
> This should probably be extended so a uapi-exposed constant is passed to
> the hook in order to make it easier to write policy in other LSMs, but
> does this broadly look like you were imagining?

This looks promising!

An LSM could also potentially implement its own policy for the hook.

-- 
James Morris
<jmorris@namei.org>


  parent reply	other threads:[~2019-05-22  2:41 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21 22:40 Matthew Garrett
2019-05-21 22:40 ` [RFC 1/2] security: Support early LSMs Matthew Garrett
2019-05-21 22:40 ` [RFC 2/2] Add the ability to lock down access to the running kernel image Matthew Garrett
2019-05-22  2:48   ` James Morris
2019-05-22  2:40 ` James Morris [this message]
2019-05-22 16:48   ` [RFC] Turn lockdown into an LSM Matthew Garrett
2019-05-22 17:08     ` Andy Lutomirski
2019-05-22 18:05       ` James Morris
2019-05-22 18:30       ` Stephen Smalley
2019-05-22 19:19         ` James Morris
2019-05-22 19:57           ` Casey Schaufler
2019-05-22 20:03           ` Stephen Smalley

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