On Mon, Sep 19, 2022, at 2:45 PM, Robbie Harwood wrote:

> I'm fine with the proposed change.  I'm also fine with the original
> text.
>
> During boot, certain actions are taken that are recorded in the TPM.
> These include, for instance, any loaders that are run - like grub2.  The
> result is that if you load Windows from grub2 rather than the EFI
> firmware, the TPM state will be different.  Bitlocker cares about this
> TPM state.
>
> So: if you install Windows and set up Bitlocker booting through grub, it
> will continue to work through grub.  

The Windows installer drops a payload on the drive, and sets a bootnext for an 
entry that points to the Windows bootloader, not via GRUB. 

And then, the instant we update either shim or grub, Windows boot will break. 

I think working around this is sufficiently tedious no users are likely to do 
it.

-- 
Chris Murphy
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