linux-kernel - [PATCH v4 0/3] security: Always enable integrity LSM

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Message-Id: <20230310085401.1964889-1-roberto.sassu@huaweicloud.com>
Date:   Fri, 10 Mar 2023 09:53:58 +0100
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     zohar@...ux.ibm.com, dmitry.kasatkin@...il.com,
        paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
        mic@...ikod.net
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH v4 0/3] security: Always enable integrity LSM

From: Roberto Sassu <roberto.sassu@...wei.com>

Since the integrity (including IMA and EVM) functions are currently always
called by the LSM infrastructure, and always after all LSMs, formalize
these requirements by introducing a new LSM ordering called LSM_ORDER_LAST,
and set it for the 'integrity' LSM (patch 1).

Consequently, revert commit 92063f3ca73a ("integrity: double check
iint_cache was initialized"), as the double check becomes always verified
(patch 2), and remove 'integrity' from the list of LSMs in
security/Kconfig (patch 3).

Changelog

v3:
- Remove Signed-off-by tag by Mimi (suggested by Paul)
- Clarify that an LSM with order LSM_ORDER_FIRST or LSM_ORDER_LAST is
  always enabled if it is selected in the kernel configuration (suggested
  by Paul)

v2:
- Fix commit message in patch 1 (suggested by Mimi)
- Bump version of patch 2 (v1 -> v3) to make one patch set
- Add patch 3 (suggested by Mimi)

v1:
- Add comment for LSM_ORDER_LAST definition (suggested by Mimi)
- Add Fixes tag (suggested by Mimi)
- Do minor corrections in the commit messages (suggested by Mimi and
  Stefan)

Roberto Sassu (3):
  security: Introduce LSM_ORDER_LAST and set it for the integrity LSM
  Revert "integrity: double check iint_cache was initialized"
  security: Remove integrity from the LSM list in Kconfig

 include/linux/lsm_hooks.h |  1 +
 security/Kconfig          | 16 +++++++++-------
 security/integrity/iint.c |  9 +--------
 security/security.c       | 12 +++++++++---
 4 files changed, 20 insertions(+), 18 deletions(-)

-- 
2.25.1