linux-kernel - Re: [PATCH v10 0/25] security: Move IMA and EVM to the LSM infrastructure

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Date: Thu, 15 Feb 2024 23:43:36 -0500
From: Paul Moore <paul@...l-moore.com>
To: Roberto Sassu <roberto.sassu@...weicloud.com>, viro@...iv.linux.org.uk, brauner@...nel.org, jack@...e.cz, chuck.lever@...cle.com, jlayton@...nel.org, neilb@...e.de, kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com, jmorris@...ei.org, serge@...lyn.com, zohar@...ux.ibm.com, dmitry.kasatkin@...il.com, eric.snowberg@...cle.com, dhowells@...hat.com, jarkko@...nel.org, stephen.smalley.work@...il.com, omosnace@...hat.com, casey@...aufler-ca.com, shuah@...nel.org, mic@...ikod.net
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org, linux-security-module@...r.kernel.org, linux-integrity@...r.kernel.org, keyrings@...r.kernel.org, selinux@...r.kernel.org, linux-kselftest@...r.kernel.org, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v10 0/25] security: Move IMA and EVM to the LSM
 infrastructure

On Feb 15, 2024 Roberto Sassu <roberto.sassu@...weicloud.com> wrote:
> 
> IMA and EVM are not effectively LSMs, especially due to the fact that in
> the past they could not provide a security blob while there is another LSM
> active.
> 
> That changed in the recent years, the LSM stacking feature now makes it
> possible to stack together multiple LSMs, and allows them to provide a
> security blob for most kernel objects. While the LSM stacking feature has
> some limitations being worked out, it is already suitable to make IMA and
> EVM as LSMs.
> 
> The main purpose of this patch set is to remove IMA and EVM function calls,
> hardcoded in the LSM infrastructure and other places in the kernel, and to
> register them as LSM hook implementations, so that those functions are
> called by the LSM infrastructure like other regular LSMs.

As discussed earlier, I've just merged this into the lsm/dev tree; a big
thank you to Roberto for working on this and to all helped along the way
with reviews, testing, etc.  I've wanted to see IMA/EVM integrated as
proper LSMs for a while and I'm very happy to finally see it happening.

Mimi, Roberto, I'm going to hold off on merging anything into the lsm/dev
tree for a few days in case you decide you would prefer to take these
patches yourselves.  If I don't hear anything from the two of you, I'll
plan to send these to Linus during the next merge window.

--
paul-moore.com