linux-hardening - Re: [PATCH 1/9] integrity: Prepare for having "ima" and "evm" available in "integrity" LSM

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Date:   Wed, 19 Oct 2022 10:34:08 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        Mickaël Salaün <mic@...ikod.net>,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, KP Singh <kpsingh@...nel.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        John Johansen <john.johansen@...onical.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/9] integrity: Prepare for having "ima" and "evm"
 available in "integrity" LSM

On Thu, 2022-10-13 at 15:36 -0700, Kees Cook wrote:
> Move "integrity" LSM to the end of the Kconfig list and prepare for
> having ima and evm LSM initialization called from the top-level
> "integrity" LSM.

The securityfs integrity directory and the "iint_cache" are shared
IMA/EVM resources.  Just because the "iint_cache" was on an LSM hook,
it should never have been treated as an LSM on its own.  IMA maintains
and verifies file data integrity, while EVM maintains and verifies file
metadata integrity.  IMA and EVM may both be configured and enabled, or
independently of each other.   However, only if either IMA or EVM are
configured and enabled, should the iint_cache be created.  There is
absolutely no need for an independent "integrity" LSM.
-- 
thanks,

Mimi