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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20180404125743.GB16242@thunk.org> References: <20180404125743.GB16242@thunk.org> To: "Theodore Y. Ts'o" Cc: dhowells@redhat.com, Matthew Garrett , Linus Torvalds , luto@kernel.org, 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 Subject: Re: [GIT PULL] Kernel lockdown for secure boot MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <24352.1522848817.1@warthog.procyon.org.uk> Date: Wed, 04 Apr 2018 14:33:37 +0100 Message-ID: <24353.1522848817@warthog.procyon.org.uk> Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Theodore Y. Ts'o wrote: > Whoa. Why doesn't lockdown prevent kexec? Put another away, why > isn't this a problem for people who are fearful that Linux could be > used as part of a Windows boot virus in a Secure UEFI context? Lockdown mode restricts kexec to booting an authorised image (where the authorisation may be by signature or by IMA). David