.config

• Ubuntu configs

  • Use the config of the newest minor version of the kernel which is for newer patch versions of the kernel

  curl '<https://kernel.ubuntu.com/config/noble/linux/6.8.0-40.40/amd64-config.flavour.generic>' -o .config
  # cp /boot/config-$(uname -r) .config
  make olddefconfig
  

  Index of /config

  Ubuntu Wiki

• Disable dbgsym compilation

  scripts/config --disable DEBUG_INFO_DWARF5
  # for old kernels:
  scripts/config --disable DEBUG_INFO
  

• Disable Canonical certificates

  scripts/config --set-str SYSTEM_TRUSTED_KEYS ""
  scripts/config --set-str SYSTEM_REVOCATION_KEYS ""
  

Steps

• Download kernel from kernel.org & extract tarball

# Set up and apply patches
mkdir patches
# put the patch to patches/
quilt new patches/file.patch
quilt pop -a && quilt push -a

# put the config file
make menuconfig
make bindeb-pkg -j$(nproc) LOCALVERSION=-custom

Patches

• Compiling 5.4 with newer binutils

  fix-thunk.patch

  patches/0004 x86/entry: build thunk_$(BITS) only if CONFIG_PREEMPTION=y by dfaggioli · Pull Request #5 · containers/libkrunfw