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    SubjectRe: [GIT PULL] Kernel lockdown for secure boot
    On Wed, Apr 4, 2018 at 6:52 AM Theodore Y. Ts'o <tytso@mit.edu> wrote:

    > On Wed, Apr 04, 2018 at 02:33:37PM +0100, David Howells wrote:
    > > Theodore Y. Ts'o <tytso@mit.edu> 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).

    > If that's true, then Matthew's assertion that lockdown w/o secure boot
    > is insecure goes away, no?

    If you don't have secure boot then an attacker with root can modify your
    bootloader or kernel, and on next boot lockdown can be silently disabled.

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