linux-kernel - Re: [PATCH] LSM: Revive CONFIG_DEFAULT_SECURITY

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Message-ID: <be269870-2dbe-6b24-d74d-a349d44b38c9@i-love.sakura.ne.jp>
Date:   Sat, 30 Mar 2019 08:51:05 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:     Kees Cook <keescook@...omium.org>
Cc:     James Morris <jmorris@...ei.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] LSM: Revive CONFIG_DEFAULT_SECURITY_* for "make
 oldconfig"

On 2019/03/30 4:36, Kees Cook wrote:
> Note that since TOMOYO can be fully stacked against the other legacy
> major LSMs, when it is selected, it explicitly disables the other LSMs
> to avoid them also initializing since TOMOYO does not expect this
> currently.

Excuse me, but isn't this exception confusing, for DEFAULT_SECURITY_TOMOYO
and DEFAULT_SECURITY_DAC are "opt-in" whereas DEFAULT_SECURITY_SELINUX and
DEFAULT_SECURITY_SMACK and DEFAULT_SECURITY_APPARMOR are "opt-out" ?

If SELinux/Smack/AppArmor people think this mixture is fine, I'm fine though...

>  config LSM
>  	string "Ordered list of enabled LSMs"
> +	default "yama,loadpin,safesetid,integrity,smack,selinux,tomoyo,apparmor" if DEFAULT_SECURITY_SMACK
> +	default "yama,loadpin,safesetid,integrity,apparmor,selinux,smack,tomoyo" if DEFAULT_SECURITY_APPARMOR
> +	default "yama,loadpin,safesetid,integrity,tomoyo" if DEFAULT_SECURITY_TOMOYO
> +	default "yama,loadpin,safesetid,integrity" if DEFAULT_SECURITY_DAC
>  	default "yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor"
>  	help
>  	  A comma-separated list of LSMs, in initialization order.
>