Re: The future of legacy BIOS support in Fedora.

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On Tuesday, July 7, 2020 3:17:16 AM MST Gerd Hoffmann wrote:
> On Mon, Jul 06, 2020 at 01:26:31PM -0700, John M. Harris Jr wrote:
> 
> > On Monday, July 6, 2020 5:24:32 AM MST Gerd Hoffmann wrote:
> > 
> > > Default fedora disk layout in UEFI mode is partitions for ESP, /boot
> > > and
> > > LVM.  If you ask for full disk encryption LVM is encrypted, ESP + boot
> > > are not.  Which makes sense to me.  Why would you encrypt /boot?  The
> > > files you can find there are public anyway, you can download them from
> > > the fedora servers.  Encrypting /boot would make the boot process more
> > > fragile for no benefit.
> > 
> > 
> > I guess that shows how unfamiliar I am with UEFI boot Fedora. You would 
> > encrypt /boot to ensure that your boot images have not been tampered
> > with,
> 
> 
> Well, if that is your concern the answer is secure boot.  That will not
> only prevent tampering with /boot files, but also prevent tampering with
> the bootloader itself.

No, Secure Boot doesn't solve that problem. Secure Boot, in Fedora anyway, 
needlessly disables a lot of kernel functionality, which makes it completely 
unusable. You cannot load kernel modules you've built, hibernate your system, 
etc. Additionally, Secure Boot does not prevent tampering with /boot files. 
You can still change grub.cfg as you like.

> > or  config files haven't been read by somebody other than the end
> > user.
> 
> 
> Hmm, typically that is pretty standard stuff and very simliar on all
> fedora installs.  Only the root filesystem uuid differs, and possibly
> local tweaks like configuring a serial console.  I can't see how reading
> that is of much concern.

There's no reason to allow these files to be read to begin with, if the system 
is going to be encrypted.

-- 
John M. Harris, Jr.

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