U-root

u-root and SystemBoot are Go-based (and therefore memory-safe) alternatives to Busybox and Petitboot, which could potentially be used in Skiroot to improve security.

u-root Porting Status

A small number of u-root commands, e.g. strace, do not build for ppc64le at the moment.

SystemBoot Porting Status

SystemBoot relies on CONFIG_KEXEC_FILE, which is missing in the Skiroot Linux config.

Instructions to Test

1. Build u-root as a tar.
2. Put the tar on a USB mass storage device.
3. Boot into a Skiroot shell.
4. Enter the below commands:

    cd /tmp/
    mkdir u-root
    cd u-root/
    tar -xf /var/petitboot/mnt/dev/sdd1/u-root/initramfs.linux_ppc64le.tar # Use the path to your USB drive
    cd initramfs.linux_ppc64le.cpio
    chroot .
    ./init
    boot
   

5. Pick a boot device.

See Also

• Skiroot
• Petitboot
• Heads

References

• u-root website
• u-root source code