this post was submitted on 09 Dec 2025
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Grub and the Microsoft Ransomware (lemmy.ml)
submitted 6 months ago by Moonrise2473@lemmy.ml to c/linux@lemmy.ml
16 comments fedilink hide all child comments
 

TL;DR: bitlocker does not like grub

Full story:

Months ago I installed fedora on my desktop, dual booting Windows 11.

In all this time I never had the need to boot into windows. I remembered that it worked fine after install, good, and then I forgot about that.

Today I needed a specific windows only software, so at grub I chose the microsoft bootloader and... BITLOCKER.

Huh? Bitlocker? Me? What? Searched frantically for that decryption password in my keepass, did not find. What?? How???

After a few minutes staring at that screen I thought, ok let's just wipe that shit and reclaim the space. I went back to linux, opened the partition manager, then remembered that i had something important in single copy over there. Noooooo

Went back to the boot screen to try again, still failed password.

Then I notice the error:

e_fve_pcr_mismatch

that mismatch lets me think that maybe I had something wrong in my booting.

I try to put windows first in the bios and it works! WHAT THE...?!??

So, if i put linux first, then launch windows from grub, bitlocker takes the windows partition under ransom, i can only access if windows is first. And of course in windows 11 x64 is no longer possible add linux partitions in their boot manager (previously it was possible)

Incompetence or maliciousness?

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[–] tea@lemmy.today 0 points 6 months ago (2 children)

I have given up dual-booting and just have a Windows VM for work things that require Windows. Less muss, less fuss and I can move the VM around as needed when moving between primary PCs.

[–] eldavi@lemmy.ml 0 points 6 months ago (1 children)

did you have to buy a windows license to do it?

[–] Engywuck@lemmy.zip -1 points 6 months ago (1 children)

You may want to Google for a dev called Massgrave.

[–] eleijeep@piefed.social 0 points 6 months ago (1 children)

Is their GitHub account called massgravel (with an L at the end)? Or is that someone typo-squatting?

[–] Engywuck@lemmy.zip -1 points 6 months ago

Just checked, massgravel (with an L) is right.

[–] Engywuck@lemmy.zip -1 points 6 months ago (1 children)

This. And fuck secure boot. Nowadays almost any of can run VMs flawlessly.

[–] wildbus8979@sh.itjust.works 0 points 6 months ago (1 children)

You can even use SecureBoot and TPM in a VM ;) OVMF EDK2 fully supports both ;)

SecureBoot is fine, sucks that vendors won't add distro keys but you can do that yourself, or use the shim.

[–] Engywuck@lemmy.zip -1 points 6 months ago (1 children)

Or just disable it in UEFI and forget about it.

[–] erebion@news.erebion.eu 0 points 6 months ago (1 children)

Security tools are there for a reason. Sure, I can encrypt my Linux rootfs, but that doesn't stop anyone from tampering with the initramfs. Secure Boot + UKI does.

[–] Engywuck@lemmy.zip -1 points 6 months ago* (last edited 6 months ago)

Cool. I still prefer to disable it.