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Tue, 3 Apr 2018 16:55:07 -0400 X-Google-Smtp-Source: AIpwx4/fbsApbYrdWpVgpUszuES/shRgt/lLs80V4ZkdP1o8j2eimruyoHm9HyJ+tXWPqbWrzcIdD27t4C0NlqdUIhM= MIME-Version: 1.0 References: <4136.1522452584@warthog.procyon.org.uk> <186aeb7e-1225-4bb8-3ff5-863a1cde86de@kernel.org> <30459.1522739219@warthog.procyon.org.uk> In-Reply-To: From: Matthew Garrett Date: Tue, 03 Apr 2018 20:54:55 +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 1:53 PM Linus Torvalds wrote: > On Tue, Apr 3, 2018 at 9:29 AM, Matthew Garrett wrote: > > On Tue, Apr 3, 2018 at 8:11 AM Andy Lutomirski wrote: > >> Can you explain that much more clearly? I'm asking why booting via > >> UEFI Secure Boot should enable lockdown, and I don't see what this has > >> to do with kexec. And "someone blacklist[ing] your key in the > >> bootloader" sounds like a political issue, not a technical issue. > > > > A kernel that allows users arbitrary access to ring 0 is just an > > overfeatured bootloader. Why would you want secure boot in that case? > .. maybe you don't *want* secure boot, but it's been pushed in your > face by people with an agenda? Then turn it off, or build a self-signed kernel that doesn't do this?