linux-kernel - Re: [PATCH] LSM: allow loadable kernel module based LSM modules

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Message-ID: <939e984a-8c5d-456d-a986-26e242e45488@I-love.SAKURA.ne.jp>
Date: Fri, 6 Sep 2024 19:55:30 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: Paul Moore <paul@...l-moore.com>
Cc: linux-security-module <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, tomoyo-dev-en@...ts.osdn.me,
        tomoyo-users-en@...ts.osdn.me,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] LSM: allow loadable kernel module based LSM modules

On 2024/09/06 16:43, Tetsuo Handa wrote:
> On 2024/09/04 23:23, Paul Moore wrote:
>> Patches that add complexity to the LSM framework without any benefit
>> to the upstream, in-tree LSMs, or the upstream kernel in general, are
>> not good candidates for inclusion in the upstream kernel.

This patch adds a clear value for Linux users that people get more chances to
use LSM modules which match their needs.

Quoting from [1]:

  Regarding CONFIG_MODULES=y,
  "Vendor-A enables module-A" == "Vendor-A provides support for module-A" and
  "Vendor-B enables module-B" == "Vendor-B provides support for module-B".

  Regarding CONFIG_SECURITY=y (namely in the RH world),
  "Distributor-A enables LSM-A" == "Distributor-A provides support for LSM-A".
  However, "Distributor-A does not enable LSM-B" == "Some vendor is impossible to
  provide support for LSM-B".

  "Distributor-A does not enable module-B" == "Distributor-A is not responsible for
  providing support for module-B" and "Vendor-B enables LSM-B" == "Vendor-B provides
  support for LSM-B" are what I expect.

  Current LSM interface does not allow LSM-B to exist in Distributor-A's systems.
  The "enable" == "support" model should be allowed for LSM interface as well.
  What a strange asymmetry rule!

Your "any benefit to in-tree LSMs" is completely ignoring Linux users.
LSM is for all Linux users, LSM is not only for LSM developers.

Link: https://lkml.kernel.org/r/c2a3279d-451d-23df-0911-e545d21492e6@I-love.SAKURA.ne.jp [1]