Magisk/scripts/boot_patch.sh

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#!/system/bin/sh
##########################################################################################
#
# 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
#
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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. Expect path to boot image as parameter.
# (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 requires for this script
# to work properly
# magiskinit binary The binary to replace /init, which has the magisk binary embedded
# magiskboot binary A tool to unpack boot image, decompress ramdisk, extract ramdisk,
# and patch the ramdisk for Magisk support
# chromeos folder This folder should store all the utilities and keys to sign
# (optional) a chromeos device. Used for Pixel C
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#
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# If the script is not running as root, then the input boot image should be a stock image
# or have a backup included in ramdisk internally, since we cannot access the stock boot
# image placed under /data we've created when previously installed
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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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##########################################################################################
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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 $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
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chmod -R 755 .
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# Extract magisk if doesn't exist
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[ -e magisk ] || ./magiskinit -x magisk magisk
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##########################################################################################
# Unpack
##########################################################################################
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CHROMEOS=false
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ui_print "- Unpacking boot image"
./magiskboot --unpack "$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
##########################################################################################
# Ramdisk restores
##########################################################################################
# Test patch status and do restore, after this section, ramdisk.cpio.orig is guaranteed to exist
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ui_print "- Checking ramdisk status"
./magiskboot --cpio ramdisk.cpio test
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case $? in
0 ) # Stock boot
ui_print "- Stock boot image detected"
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ui_print "- Backing up stock boot image"
SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
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STOCKDUMP=stock_boot_${SHA1}.img.gz
./magiskboot --compress "$BOOTIMAGE" $STOCKDUMP
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cp -af ramdisk.cpio ramdisk.cpio.orig
;;
1 ) # Magisk patched
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ui_print "- Magisk patched boot image detected"
# Find SHA1 of stock boot image
[ -z $SHA1 ] && SHA1=`./magiskboot --cpio ramdisk.cpio sha1 2>/dev/null`
./magiskboot --cpio ramdisk.cpio restore
cp -af ramdisk.cpio ramdisk.cpio.orig
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;;
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2 ) # Other patched
ui_print "! Boot image patched by unsupported programs"
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abort "! Please restore stock boot image"
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;;
esac
##########################################################################################
# Ramdisk patches
##########################################################################################
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ui_print "- Patching ramdisk"
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echo "KEEPVERITY=$KEEPVERITY" > config
echo "KEEPFORCEENCRYPT=$KEEPFORCEENCRYPT" >> config
[ ! -z $SHA1 ] && echo "SHA1=$SHA1" >> config
./magiskboot --cpio ramdisk.cpio \
"add 750 init magiskinit" \
"patch $KEEPVERITY $KEEPFORCEENCRYPT" \
"backup ramdisk.cpio.orig" \
"add 000 .backup/.magisk config"
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rm -f ramdisk.cpio.orig config
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##########################################################################################
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# Binary patches
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##########################################################################################
if ! $KEEPVERITY; then
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[ -f dtb ] && ./magiskboot --dtb-patch dtb && ui_print "- Removing dm(avb)-verity in dtb"
[ -f extra ] && ./magiskboot --dtb-patch extra && ui_print "- Removing dm(avb)-verity in extra-dtb"
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fi
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if [ -f kernel ]; then
# Remove Samsung RKP
./magiskboot --hexpatch kernel \
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49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
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# Remove Samsung defex
# Before: [mov w2, #-221] (-__NR_execve)
# After: [mov w2, #-32768]
./magiskboot --hexpatch kernel 821B8012 E2FF8F12
# Force kernel to load rootfs
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# skip_initramfs -> want_initramfs
./magiskboot --hexpatch kernel \
736B69705F696E697472616D667300 \
77616E745F696E697472616D667300
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fi
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##########################################################################################
# Repack and flash
##########################################################################################
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ui_print "- Repacking boot image"
./magiskboot --repack "$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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./magiskboot --cleanup