security-misc/etc/initramfs-tools/scripts/init-bottom/sysctl-initramfs

#!/bin/sh

## Copyright (C) 2012 - 2019 ENCRYPTED SUPPORT LP <adrelanos@riseup.net>
## See the file COPYING for copying conditions.

PREREQ=""
prereqs()
{
        echo "$PREREQ"
}
case $1 in
prereqs)
        prereqs
        exit 0
        ;;
esac

## ${rootmnt} is mounted read-only in the initramfs so it needs to be remounted first.
if mount | grep "${rootmnt}" | grep -q "(ro,"; then
  remount="yes"
  mount -o remount,rw "${rootmnt}"
fi
sysctl -p ${rootmnt}/etc/sysctl.conf >/dev/null 2>${rootmnt}/var/log/sysctl-initramfs-error.log
sysctl -p ${rootmnt}/etc/sysctl.d/*.conf >/dev/null 2>>${rootmnt}/var/log/sysctl-initramfs-error.log 
if [ "${remount}" = "yes" ]; then
  mount -o remount,ro "${rootmnt}"
fi
grep -v "unprivileged_userfaultfd" "${rootmnt}/var/log/sysctl-initramfs-error.log"

true