linux-kernel - Re: [PATCH] LSM: Ignore "security=" when "lsm=" is specified

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Message-Id: <201902120059.x1C0xEbp071744@www262.sakura.ne.jp>
Date:   Tue, 12 Feb 2019 09:59:14 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Kees Cook <keescook@...omium.org>
Cc:     James Morris <jmorris@...ei.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] LSM: Ignore "security=" when "lsm=" is specified

Kees Cook wrote:
> On Mon, Feb 11, 2019 at 4:21 PM Tetsuo Handa
> <penguin-kernel@...ove.sakura.ne.jp> wrote:
> >
> > Kees Cook wrote:
> > > To avoid potential confusion, explicitly ignore "security=" when "lsm=" is
> > > used on the command line, and report that it is happening.
> >
> > To maintain the existing behavior of CONFIG_DEFAULT_SECURITY, I also suggest this change.
> > This saves e.g. Ubuntu users who are using only AppArmor from explicitly specifying
> > security=apparmor when they don't want to enable other LSM_FLAG_LEGACY_MAJOR modules.
> 
> No, this completely disables the purpose of lsm=
> 
> I don't understand the use-case you're concerned about?

The purpose of lsm= remains.

I worry that distro users who don't explicitly specify security= parameter
suddenly find TOMOYO messages because TOMOYO is no longer exclusive.
There are two ways for avoiding it. One is to explicitly specify security=
parameter. The other is to remove tomoyo from CONFIG_LSM. This change adds
the third way; preserve current security= behavior until they start explicitly
specifying lsm= parameter.