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Re: GRUB and boot partition




Le 26/12/2017 à 12:24, tomas@xxxxxxxxxx a écrit :

On Tue, Dec 26, 2017 at 12:10:52PM +0100, Pascal Hambourg wrote:
Le 26/12/2017 à 11:36, tomas@xxxxxxxxxx a écrit :

Is there any inherent advantage to having /boot encrypted?

I can imagine a few situations.

- When you can enforce the early stage of GRUB integrity by storing
it on removable or read-only boot media, checking it with trusted
computing, TPM...
You could extend this to the whole /boot directory contents instead
of encrypting it but parts of it such as the kernel image, initramfs
and grub.cfg change quite often, while GRUB itself seldom changes.
An alternative to /boot encryption is to sign its contents so that
GRUB early stage can check the files when loading them.

- When you need to store sensitive data in /boot, such as
passphrases for other encrypted volumes.

In the days you measure (small) external media in gigabytes, this
argument has lost a lot of push.

What does storage size have to do with these situations ?

But yes, on some specialized hardware that might make a difference.
FWIW, /boot/grub is 9.1M (yikes! didn't I say I don't like how fat
the boot loader has become?

You can remove all the unneeded modules for features that you do not use.