bugGNU GRUB - Bugs: bug #57381, EFI image with wrong prefix when...


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bug #57381: EFI image with wrong prefix when bootload-id is specified

Submitted by:  Adam Li <c0redumb>
Submitted on:  Sun 08 Dec 2019 05:23:24 AM UTC  
Category:  None Severity:  Major
Priority:  5 - Normal Item Group:  Software Error
Status:  None Privacy:  Public
Assigned to:  None Originator Name:  Adam Li
Open/Closed:  Open Release: 
Release:  2.02 Reproducibility:  Every Time
Planned Release:  None

Sun 08 Dec 2019 05:23:24 AM UTC, original submission:  

This is with Grub 2.02 that comes with Ubuntu 18.04.

When --bootloader-id is specified when running "grub-install" with target x86_64-efi (for example, --bootloader-id myboot), the efi image file (grubx64.efi) is generated and put in folder /EFI/myboot/ on ESP. The initial load configure file (grub.cfg) is also put in the same folder (/EFI/myboot/ on ESP).

However, the efi image file is generated with prefix of "/EFI/ubuntu". This can be verified by run "strings grubx64.efi" on the efi image file.

As a result, the grub efi file can not find the initial configuration file and falls back to the command interface. It is trying to find it at esp/EFI/ubuntu (based on the prefix), but indeed it should be at esp/EFI/myboot.

I believe this should be an easy fix by looking at how bootloader_id and distributor_id was use in grub-install.c. But I had trouble building the grub project from git (that's probably another story). Some one on your team who is more familiar with the code could make that change easily.


Adam Li <c0redumb>


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