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kernel-std-signed is used to create the signed kernel package (linux-image-5.10.0-6-amd64) and 2 common packages (linux-image-amd64 and linux-headers-amd64) without the abi version in package name. The process of building kernel-std-signed is as below (following debian): (1) Build kernel-std. When we build kernel-std, linux-image-amd64-signed-template package is created. It contains both a debian folder for building kernel-std-signed later and the information of files which maybe need signatures in the unsigned kernel package linux-image-5.10.0-6-amd64-unsigned. (2) Run script to sign kernel image file. This script can be customized according to different requests. e.g. I use the script debian-test-sign from debian (https://salsa.debian.org/kernel-team/kernel-team/-/blob/master/ scripts/debian-test-sign) and adjust it according to our needs. This script's input is the output files of building kernel-std: linux_*_amd64.changes; linux-image-amd64-signed-template_*_amd64.deb; linux-image-5.10.0-6-amd64-unsigned_*_amd64.deb. This script's output is 2 files put at kernel-std's output path (/localdisk/loadbuild/*/stx/std/kernel-std): linux-signed-amd64_*.dsc; linux-signed-amd64_*.tar.xz. The 2nd file contains a debian folder for building kernel-std-signed and the signature for kernel image file. (3) Build kernel-std-signed Get the debian folder from linux-signed-amd64_*.tar.xz and build 3 pkgs: linux-image-5.10.0-6-amd64; linux-image-amd64; linux-headers-amd64. linux-image-5.10.0-6-amd64's difference with linux-image-5.10.0-6-amd64-unsigned is that it contains kernel image's signature. Please pay attention to what has been changed vs. debian in this process: (1) Because we don't follow the debian secure boot process and follow LAT(wrlinux) secure boot process, I need to adjust the script debian-test-sign to do the signing and also need to adjust the debian folder for building kernel-std-signed. Their differences are: LAT uses gpg and debian uses sbsign for signing kernel image; LAT puts vmlinuz image at a different path from debian package. Path of kernel image (vmlinuz-5.10.0-6-amd64) in signed kernel package is /boot/, while LAT puts it at /boot/X/vmlinuz ("X" is variable and can be found in the BOOT_IMAGE setting in /proc/cmdline). Need to copy the kernel image and its sig file to the path that LAT uses after installing signed kernel package (linux-image-5.10.0-6-amd64). Extra lines are added in the pkg's postinst script for this. (2) Another change is that we need not care about signing modules here because we have signed them when building kernel-std and oot kernel-modules. kernel-rt-signed has a similar set of above things. Test plan: - PASS: Build kernel-std and its oot kernel-modules; Run script to sign kernel image file; Build kernel-std-signed; Change code to install linux-image-5.10.0-6-amd64 instead of linux-image-5.10.0-6-amd64-unsigned and build image. Boot up qemu with secure boot enabled. Scp newer linux-image-5.10.0-6-amd64 pkg onto qemu and use dpkg to install it. Reboot successfully. - PASS: Do above tests for kernel-rt-signed too. Story: 2009221 Task: 45167 Signed-off-by: Li Zhou <li.zhou@windriver.com> Change-Id: I3ddb99b238793204a6127c7746e14be0e8097c9a |
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| 0001-linux-signed-adapt-signing-according-to-LAT.patch | ||
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