linux-kernel - Re: [PATCH v2] security: Introduce LSM_ORDER

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Message-ID: <b8ed9f24e051158580c561a8d8863622ba2f4c8e.camel@linux.ibm.com>
Date:   Wed, 08 Mar 2023 19:23:16 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        dmitry.kasatkin@...il.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v2] security: Introduce LSM_ORDER_LAST and set it for
 the integrity LSM

On Wed, 2023-03-08 at 18:11 +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>
> 
> Introduce LSM_ORDER_LAST, to satisfy the requirement of LSMs willing to be
> the last, e.g. the 'integrity' LSM, without changing the kernel command
> line or configuration.

^needing to be last

> 
> Also, set this order for the 'integrity' LSM. While not enforced, this is
> the only LSM expected to use it.
> 
> Similarly to LSM_ORDER_FIRST, LSMs with LSM_ORDER_LAST are always enabled
> and put at the end of the LSM list.
> 
> Finally, for LSM_ORDER_MUTABLE LSMs, set the found variable to true if an
> LSM is found, regardless of its order. In this way, the kernel would not
> wrongly report that the LSM is not built-in in the kernel if its order is
> LSM_ORDER_LAST.
> 
> Fixes: 79f7865d844c ("LSM: Introduce "lsm=" for boottime LSM selection")
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

Thanks, Roberto.  With this patch, 'integrity' can be safely removed
from CONFIG_LSM definitions.

-- 
thanks,

Mimi