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DescriptionEmanuele Giuseppe Esposito
2023-08-07 07:01:33 UTC
Description of problem:
In order to create an UKI, RHEL currently uses dracut to pack initrd, systemd-stub and vmlinux all together.
In addition to these sections, we also need a .sbat section to support the SBAT mechanism that is used to revoke UKIs that contain security issues. More info about SBAT here: https://github.com/rhboot/shim/blob/main/SBAT.md
We need to update dracut to include this PR https://github.com/dracutdevs/dracut/pull/2426 so that it is able to automatically take a sbat section from vmlinux and systemd-stub and merge them in a new UKI sbat section. More infos in the PR.
Version-Release number of selected component (if applicable):
How reproducible:
100%
Steps to Reproduce:
1. clone systemd repo && make sure packages shim efibootmgr kernel-uki-virt are installed
2. compile systemd stub (mkdif build && ./configure -Dbootloader=true && make)
3. generate UKI with dracut (dracut-virt.conf is taken from https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/blob/main/redhat/dracut-virt.conf)
dracut --conf=/root/dracut-virt.conf --confdir=$(mktemp -d) --verbose --kver 5.14.0-284.el9.x86_64 --kmoddir=/lib/modules/5.14.0-284.el9.x86_64/ --uefi --kernel-image=/boot/vmlinuz-5.14.0-284.el9.x86_64 --kernel-cmdline "console=tty0 console=ttyS0 $CMD_LINE" --uefi-stub /mnt/systemd/build/src/boot/efi/linuxx64.efi.stub --force /boot/efi/EFI/Linux/$EFI_FILE
printf "\\\EFI\\\Linux\\\\${EFI_FILE}\0" | iconv -f ASCII -t UCS-2 > /tmp/bootarg
efibootmgr -c -d /dev/vda -p 2 --append-binary-args /tmp/bootarg -L $EFI_NAME -l "\EFI\redhat\shimx64.efi"
4. check that the UKI has a .sbat section and the section contains 1) the sbat generic string, 2) systemd-stub sbat version, 3) eventually vmlinux section if there is one.
Also test with --sbat "some sbat string" added to dracut in step 3 and verify in step 4 that it is present in the UKI too
objcopy -O binary --only-section=.sbat $EFI_FILE sbat_output.txt
Comment 1Emanuele Giuseppe Esposito
2023-08-07 07:04:02 UTC
Comment 3RHEL Program Management
2023-09-20 23:52:20 UTC
Issue migration from Bugzilla to Jira is in process at this time. This will be the last message in Jira copied from the Bugzilla bug.
Comment 4RHEL Program Management
2023-09-20 23:53:42 UTC
This BZ has been automatically migrated to the issues.redhat.com Red Hat Issue Tracker. All future work related to this report will be managed there.
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