bugGNU GRUB - Bugs: bug #56887, grub-PC check_signatures=enforce...


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bug #56887: grub-PC check_signatures=enforce support (non-EFI)

Submitter:  adrelanos <adrelanos>
Submitted:  Fri 13 Sep 2019 06:09:43 AM UTC
Category:  Security Severity:  Major
Priority:  5 - Normal Item Group:  Feature Request
Status:  None Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Open Release:  * 2.02~rc1
Release:  Reproducibility:  Every Time
Planned Release:  None
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Fri 13 Sep 2019 06:09:43 AM UTC, original submission:  

Could you please make it possible to do signature verification with grub-pc too?


We, the maintainers of Linux distributions that primarily run inside VMs (Whonix; Kicksecure) would like to implement verified boot. Not necessarily Secure Boot.

At the moment, there are no tools that can create VM images (with Debian Linux) which support EFI booting. Also, support by virtualizers such as KVM, Xen, VirtualBox for Secure Boot is either non-existing or undocumented.

Another reason is, that inside VMs we don’t necessarily need the
complexity of EFI.

Instead we could boot unverified (usual virtual BIOS legacy boot) from a virtual, read-only (write protected) boot medium (such as ISO). That boot loader on the initial boot disk (grub2) could then verify and chainload the boot loader (grub2) on the main disk. Which then would go on to verify the kernel. In result, we would have a verified boot sequence.

adrelanos <adrelanos>


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