MESSAGE
| DATE | 2017-01-26 |
| FROM | Rick Moen
|
| SUBJECT | Re: [Hangout-NYLXS] coreboot and payloads
|
Quoting Ruben Safir (ruben-at-mrbrklyn.com):
> Forget about reaching the bios. This is almost like the UEFI idea but
> without the crypto ^^^^
I think you mean SecureBoot, not UEFI.
> https://libreboot.org/faq/#version
> You can't get under grub or around grub.
Huh? Cited FAQ URL says nothing to that effect. That just says how to
query Libreboot's data structures to find out what Libreboot version you
have.
My understanding is that you have some sort of Lenovo laptop whose
factory proprietary BIOS has been reflashed by vendor
https://minifree.org/ to use instead Libreboot, which in turn boots some
version of GRUB, which in turn boots Debian. I assume you saw this
on minifree.org's FAQ:
Q: What’s the username and password?
A: On all laptops shipped by Minifree, the default username is user
and the password is cuser90r (or password)
You must change at least the password immediately, because this is
generic and not secure, used on every minifree laptop that is shipped.
In order to get in with root authority, the most obvious way would be to
interrupt GRUB. I actually rather detest GRUB, and don't often deal
with it. Ordinarily, to break into GRUB (according to a quick Web
search), it suffices to hod down the Shift key while your system boots.
According to Internet sources, this works both in GRUB 1.9x ("Legacy
GRUB") and the even more detestable and overengineered GRUB2.
Sometimes, Esc will also do it, apparently. See:
https://help.ubuntu.com/community/Grub2#Hidden
Having interrupted GRUB, then you are in a position to do a one-time
alteration of the booting kernel's bootloader parameters, and can add
the word 'single', while also removing 'quiet' or any rubbish like that,
that was inserted to show you soothing pictures and hide boot-process
information.
Occasionally, some real nitwit _also_ password-wraps the GRUB screens.
Here's docs about that:
https://help.ubuntu.com/community/Grub2/Passwords
In any event, if you can get GRUB's attention and edit access to its
current booting directives, you can alter just about anything, like
specifying for the current occasion a different boot device so that you
can boot a USB flash stick or optical disk.
GRUB uses its own naming structure for drives and partitions in the form
of (hdn,m), where n is the hard drive number and m is the partition
number. The hard drive number starts from zero, but the partition number
starts from one for normal partitions and five for extended partitions.
Note that this is different from earlier versions where both numbers
started from zero. For example, partition sda1 is (hd0,1) to GRUB and
sdb3 is (hd1,3). In contrast to Linux, GRUB does not consider CD-ROM
drives to be hard drives. For example, if using a CD on hdb and a second
hard drive on hdc, that second hard drive would still be (hd1).
I just looked up the foregoing, because I really rather dislike GRUB.
Did I mention that I really don't like it much? ;->
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