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Tue, 3 Apr 2018 12:29:59 -0400 X-Google-Smtp-Source: AIpwx4/exvGfslObJMvl6s47TIDaF+ZK8nS6/WnOm27VGTthVzZ8sR2WB+U6Vvyja+KGkeuoPoM9osmI4Fd2i5MTeUI= 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 16:29:48 +0000 Message-ID: Subject: Re: [GIT PULL] Kernel lockdown for secure boot To: luto@kernel.org Cc: David Howells , Ard Biesheuvel , jmorris@namei.org, Alan Cox , Linus Torvalds , 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: linux-efi-owner@vger.kernel.org X-Mailing-List: linux-efi@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 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?