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From:   Kees Cook <keescook@chromium.org>
Date:   Tue, 2 Oct 2018 16:54:32 -0700
Message-ID: <CAGXu5jKqSZ5LhQ_HwbA9-_DAg3efNzWfLjpxO_rurBgUZ-nnAA@mail.gmail.com>
Subject: Re: [PATCH security-next v4 23/32] selinux: Remove boot parameter
To:     John Johansen <john.johansen@canonical.com>
Cc:     James Morris <jmorris@namei.org>,
        Jordan Glover <Golden_Miller83@protonmail.ch>,
        Stephen Smalley <sds@tycho.nsa.gov>,
        Paul Moore <paul@paul-moore.com>,
        Casey Schaufler <casey@schaufler-ca.com>,
        Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        "Schaufler, Casey" <casey.schaufler@intel.com>,
        linux-security-module <linux-security-module@vger.kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
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        linux-arch <linux-arch@vger.kernel.org>,
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On Tue, Oct 2, 2018 at 4:46 PM, John Johansen
<john.johansen@canonical.com> wrote:
> On 10/02/2018 04:06 PM, Kees Cook wrote:
>> I think the current proposal (in the other thread) is likely the
>> sanest approach:
>>
>> - Drop CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE
>> - Drop CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE
>> - All enabled LSMs are listed at build-time in CONFIG_LSM_ENABLE
>
> Hrrmmm isn't this a Kconfig selectable list, with each built-in LSM
> available to be enabled by default at boot.

That's not how I have it currently. It's a comma-separated a string,
including the reserved name "all". The default would just be
"CONFIG_LSM_ENABLE=all". Casey and I wanted this to have a way to
capture new LSMs by default at build-time.

>> - Boot time enabling for selinux= and apparmor= remain
>> - lsm.enable= is explicit: overrides above and omissions are disabled
> wfm

Okay, this is closer to v3 than v4. Paul or Stephen, how do you feel
about losing the SELinux bootparam CONFIG? (i.e. CONFIG_LSM_ENABLE
would be replacing its functionality.)

-Kees

-- 
Kees Cook
Pixel Security