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AbuSahad92 edited this page Nov 8, 2021 · 1 revision

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1l#!/system/bin/sh

Updated: May 07, 2020

by diplomatic and adapted by JunioJsv

This script sets up bootless root with Magisk on MediaTek Android devices.

It uses mtk-su, the temporary root tool for MediaTek ARMv8 chips.

WARNING: DO NOT UPDATE MAGISK THROUGH MAGISK MANAGER OR YOU WILL BRICK YOUR

DEVICE ON A LOCKED BOOTLOADER

HOMEDIR=$1

SU_MINISCRIPT='

Magisk function to find boot partition and prevent the installer from finding

it again

find_block() { for BLOCK in "$@"; do DEVICES=$(find /dev/block -type l -iname $BLOCK) 2>/dev/null for DEVICE in $DEVICES; do cd ${DEVICE%/} local BASENAME="${DEVICE##/}" mv "$BASENAME" ".$BASENAME" cd - done done

Fallback by parsing sysfs uevents

typeset -l PARTNAME BLOCK local FILELIST=$(grep -s PARTNAME= /sys/dev/block/*/uevent) 2>/dev/null for uevent in $FILELIST; do local PARTNAME=${uevent##PARTNAME=} for BLOCK in "$@"; do if [ "$BLOCK" = "$PARTNAME" ]; then local FNAME=${uevent%:} chmod 0 $FNAME fi done done return 0 }

Root only at this point; hoping selinux is permissive

if [ $(id -u) != 0 ] || [ "$(getenforce)" != "Permissive" ]; then echo "Root user only" >&2 exit 1 fi

Disaster prevention

SLOT=$(getprop ro.boot.slot_suffix) find_block boot$SLOT

cd $HOMEDIR || { setenforce 1; exit 1; }

Patch selinux policy

./magiskpolicy --live --magisk "allow magisk * * " if [ ! -f /sbin/.init-stamp ]; then # Set up /root links to /sbin files mount | grep -qF rootfs have_rootfs=$? if [ $have_rootfs -eq 0 ]; then mount -o rw,remount / mkdir -p /root chmod 750 /root if ! ln /sbin/ /root; then echo "Error making /sbin hardlinks" >&2 setenforce 1 exit 1 fi mount -o ro,remount / fi # Create tmpfs /sbin overlay # This may crash on system-as-root with no /root directory ./magisk -c >&2

touch /sbin/.init-stamp

if [ ! -f /sbin/magiskinit ] || [ ! -f /sbin/magisk ]; then
	echo "Bad /sbin mount?" >&2
	setenforce 1
	exit 1
fi

# Copy binaries
cp magiskinit /sbin/

if [ $have_rootfs -ne 0 ]; then
	mkdir /sbin/.magisk/mirror/system_root
	block=$(mount | grep " / " | cut -d\  -f1)
	[ $block = "/dev/root" ] && block=/dev/block/dm-0
	mount -o ro $block /sbin/.magisk/mirror/system_root
	for file in /sbin/.magisk/mirror/system_root/sbin/*; do
		if [ -L $file ]; then
		  cp -a $file /sbin/
		else
		  cp -ps $file /sbin/${file##*/}
		fi
	done
fi

export PATH=/sbin:$PATH

# Finish startup calls
magisk --post-fs-data
sleep 1		# hack to prevent race with later service calls
magisk --service
magisk --boot-complete

fi

setenforce 1 '

cd $HOMEDIR || exit 1

ln -fs magiskinit magiskpolicy ln -fs magiskinit magisk

strip ':c512...' tail from selinux context

ctx=$(cat /proc/$$/attr/current) newctx=${ctx/%:s0:*/:s0}

start SU daemon

export HOMEDIR echo "$SU_MINISCRIPT" | ./mtk-su -v -Z $newctx

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