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Tue, 3 Apr 2018 20:16:58 -0400 X-Google-Smtp-Source: AIpwx4+u4VLEMSn35Ccj5zL5tb44YZ5mc97SdZTC9ZU3DfmB5Um+wBG3Mu2EEePB5IxTIKni3DM+cpp92HxuMTjYEs4= MIME-Version: 1.0 References: <4136.1522452584@warthog.procyon.org.uk> <186aeb7e-1225-4bb8-3ff5-863a1cde86de@kernel.org> <30459.1522739219@warthog.procyon.org.uk> <9758.1522775763@warthog.procyon.org.uk> <13189.1522784944@warthog.procyon.org.uk> <9349.1522794769@warthog.procyon.org.uk> In-Reply-To: From: Matthew Garrett Date: Wed, 04 Apr 2018 00:16:46 +0000 Message-ID: Subject: Re: [GIT PULL] Kernel lockdown for secure boot To: Linus Torvalds Cc: luto@kernel.org, David Howells , Ard Biesheuvel , jmorris@namei.org, Alan Cox , Greg Kroah-Hartman , Linux Kernel Mailing List , jforbes@redhat.com, linux-man@vger.kernel.org, jlee@suse.com, LSM List , linux-api@vger.kernel.org, Kees Cook , linux-efi Content-Type: text/plain; charset="UTF-8" Sender: owner-linux-security-module@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Tue, Apr 3, 2018 at 5:15 PM Linus Torvalds wrote: > On Tue, Apr 3, 2018 at 5:10 PM, Matthew Garrett wrote: > > > >> Exactly like EVERY OTHER KERNEL CONFIG OPTION. > > > > So your argument is that we should make the user experience worse? Without > > some sort of verified boot mechanism, lockdown is just security theater. > > There's no good reason to enable it unless you have some mechanism for > > verifying that you booted something you trust. > Wow. Way to snip the rest of the email where I told you what the > solution was. Let me repeat it here, since you so conveniently missed > it and deleted it: I ignored it because it's not a viable option. Part of the patchset disables various kernel command line options. If there's a kernel command line option that disables the patchset then it's pointless.