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

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Date:   Thu, 09 Mar 2023 08:55:33 +0100
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     Mimi Zohar <zohar@...ux.ibm.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 19:23 -0500, Mimi Zohar wrote:
> 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

Ok.

> > 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.

Perfect, will add the new patch.

Thanks

Roberto