Magisk/scripts/boot_patch.sh

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#!/system/bin/sh
###########################################################################################
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#
# Magisk Boot Image Patcher
# by topjohnwu
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#
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# Usage: boot_patch.sh <bootimage>
#
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# The following flags can be set in environment variables:
# KEEPVERITY, KEEPFORCEENCRYPT, RECOVERYMODE
#
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# This script should be placed in a directory with the following files:
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#
# File name Type Description
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#
# boot_patch.sh script A script to patch boot image for Magisk.
# (this file) The script will use binaries and files in its same directory
# to complete the patching process
# util_functions.sh script A script which hosts all functions required for this script
# to work properly
# magiskinit binary The binary to replace /init; magisk binary embedded
# magiskboot binary A tool to manipulate boot images
# chromeos folder This folder includes all the utilities and keys to sign
# (optional) chromeos boot images. Currently only used for Pixel C
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#
###########################################################################################
############
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# Functions
############
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# Pure bash dirname implementation
getdir() {
case "$1" in
*/*) dir=${1%/*}; [ -z $dir ] && echo "/" || echo $dir ;;
*) echo "." ;;
esac
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}
#################
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# Initialization
#################
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if [ -z $SOURCEDMODE ]; then
# Switch to the location of the script file
cd "`getdir "${BASH_SOURCE:-$0}"`"
# Load utility functions
. ./util_functions.sh
fi
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BOOTIMAGE="$1"
[ -e "$BOOTIMAGE" ] || abort "$BOOTIMAGE does not exist!"
# Flags
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[ -z $KEEPVERITY ] && KEEPVERITY=false
[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
[ -z $RECOVERYMODE ] && RECOVERYMODE=false
export KEEPVERITY
export KEEPFORCEENCRYPT
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chmod -R 755 .
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# Extract magisk if doesn't exist
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[ -e magisk ] || ./magiskinit -x magisk magisk
#########
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# Unpack
#########
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CHROMEOS=false
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ui_print "- Unpacking boot image"
./magiskboot unpack "$BOOTIMAGE"
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case $? in
1 )
abort "! Unsupported/Unknown image format"
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;;
2 )
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ui_print "- ChromeOS boot image detected"
CHROMEOS=true
;;
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esac
[ -f recovery_dtbo ] && RECOVERYMODE=true
###################
# Ramdisk Restores
###################
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# Test patch status and do restore
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ui_print "- Checking ramdisk status"
if [ -e ramdisk.cpio ]; then
./magiskboot cpio ramdisk.cpio test
STATUS=$?
else
# Stock A only system-as-root
STATUS=0
fi
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case $((STATUS & 3)) in
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0 ) # Stock boot
ui_print "- Stock boot image detected"
SHA1=`./magiskboot sha1 "$BOOTIMAGE" 2>/dev/null`
cat $BOOTIMAGE > stock_boot.img
cp -af ramdisk.cpio ramdisk.cpio.orig 2>/dev/null
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;;
1 ) # Magisk patched
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ui_print "- Magisk patched boot image detected"
# Find SHA1 of stock boot image
[ -z $SHA1 ] && SHA1=`./magiskboot cpio ramdisk.cpio sha1 2>/dev/null`
./magiskboot cpio ramdisk.cpio restore
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cp -af ramdisk.cpio ramdisk.cpio.orig
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;;
2 ) # Unsupported
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ui_print "! Boot image patched by unsupported programs"
abort "! Please restore back to stock boot image"
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;;
esac
##################
# Ramdisk Patches
##################
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ui_print "- Patching ramdisk"
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echo "KEEPVERITY=$KEEPVERITY" > config
echo "KEEPFORCEENCRYPT=$KEEPFORCEENCRYPT" >> config
echo "RECOVERYMODE=$RECOVERYMODE" >> config
[ ! -z $SHA1 ] && echo "SHA1=$SHA1" >> config
./magiskboot cpio ramdisk.cpio \
"add 750 init magiskinit" \
"patch" \
"backup ramdisk.cpio.orig" \
"mkdir 000 .backup" \
"add 000 .backup/.magisk config"
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if [ $((STATUS & 4)) -ne 0 ]; then
ui_print "- Compressing ramdisk"
./magiskboot cpio ramdisk.cpio compress
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fi
rm -f ramdisk.cpio.orig config
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#################
# Binary Patches
#################
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for dt in dtb kernel_dtb extra recovery_dtbo; do
[ -f $dt ] && ./magiskboot dtb $dt patch && ui_print "- Patch fstab in $dt"
done
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if [ -f kernel ]; then
# Remove Samsung RKP
./magiskboot hexpatch kernel \
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49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
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# Remove Samsung defex
# Before: [mov w2, #-221] (-__NR_execve)
# After: [mov w2, #-32768]
./magiskboot hexpatch kernel 821B8012 E2FF8F12
# Force kernel to load rootfs
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# skip_initramfs -> want_initramfs
./magiskboot hexpatch kernel \
736B69705F696E697472616D667300 \
77616E745F696E697472616D667300
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fi
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#################
# Repack & Flash
#################
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ui_print "- Repacking boot image"
./magiskboot repack "$BOOTIMAGE" || abort "! Unable to repack boot image!"
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# Sign chromeos boot
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$CHROMEOS && sign_chromeos
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# Copy existing rules for migration
$BOOTMODE && copy_sepolicy_rules
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# Reset any error code
true