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From:   Matthew Garrett <mjg59@google.com>
Date:   Wed, 04 Apr 2018 00:19:35 +0000
Message-ID: <CACdnJutmTU4U0nMik0oqGHDEd-xd4Vhi06t3RsZ5tpUgugfNbQ@mail.gmail.com>
Subject: Re: [GIT PULL] Kernel lockdown for secure boot
To:     luto@kernel.org
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        David Howells <dhowells@redhat.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>, jmorris@namei.org,
        Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        jforbes@redhat.com, linux-man@vger.kernel.org, jlee@suse.com,
        LSM List <linux-security-module@vger.kernel.org>,
        linux-api@vger.kernel.org, Kees Cook <keescook@chromium.org>,
        linux-efi <linux-efi@vger.kernel.org>
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On Tue, Apr 3, 2018 at 5:18 PM Andy Lutomirski <luto@kernel.org> wrote:

> if your secure boot-enabled bootloader can't prevent a bad guy from
> using malicious kernel command line parameters, then fix it.

How is a bootloader supposed to know what the set of malicious kernel
command line parameters is?