Skip to content

Add note about canonical order of UKI components #181

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
arianvp wants to merge 3 commits into
base: main
Choose a base branch
from
Open

Add note about canonical order of UKI components #181

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
b572c20
Add note about canonical order of UKI components
arianvp Nov 14, 2025
9b5b662
Add line-breaks
arianvp Nov 14, 2025
8925b80
Update specs/unified_kernel_image.md
arianvp Nov 14, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
4 changes: 4 additions & 0 deletions specs/unified_kernel_image.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,10 @@ header to 0x0A (i.e. `IMAGE_SUBSYSTEM_EFI_APPLICATION`).
## UKI Components
UKIs consist of the following resources:

<!--
NOTE: these components are in canonical order for predictable PCR measurements.
Please add any new components at the bottom of the list and NEVER reorder anything in this list.
Copy link
Member

@bluca bluca Nov 14, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Actually I think pcrsig and pcrpkey are the exception to this? IE, new things should be added before .pcrsig, but these two are never used for measurements

Copy link
Author

@arianvp arianvp Nov 14, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This is not true. .pcrpkey is measured.

Copy link
Member

@bluca bluca Nov 14, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Before the pub key one then? I haven't checked

-->
* An UEFI boot stub that forms the initial program.
It contains various PE sections normally required for a program,
including `.text`, `.reloc`, `.data`, and others.
Expand Down