forked from MarcoBuster/Magisk
1cd45b53b1
Some devices (mainly new Samsung phones we're talking here...) using A only system-as-root refuse to load ramdisk when booted with boot no matter what we do. With many A only system-as-root devices, even though their boot image is kernel only, we can still be able to add a ramdisk section into the image and force the kernel to use it as rootfs. However the bootloader on devices like the S10 simply does not load anything within boot image into memory other than the kernel. This gives as the only option is to install Magisk on the recovery partition. This commits adds proper support for these kind of scenarios.
193 lines
6.3 KiB
Bash
193 lines
6.3 KiB
Bash
#!/system/bin/sh
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##########################################################################################
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#
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# Magisk Boot Image Patcher
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# by topjohnwu
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#
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# Usage: boot_patch.sh <bootimage>
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#
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# The following flags can be set in environment variables:
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# KEEPVERITY, KEEPFORCEENCRYPT
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#
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# This script should be placed in a directory with the following files:
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#
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# File name Type Description
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#
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# boot_patch.sh script A script to patch boot. Expect path to boot image as parameter.
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# (this file) The script will use binaries and files in its same directory
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# to complete the patching process
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# util_functions.sh script A script which hosts all functions requires for this script
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# to work properly
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# magiskinit binary The binary to replace /init, which has the magisk binary embedded
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# magiskboot binary A tool to unpack boot image, decompress ramdisk, extract ramdisk,
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# and patch the ramdisk for Magisk support
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# chromeos folder This folder should store all the utilities and keys to sign
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# (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
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# or have a backup included in ramdisk internally, since we cannot access the stock boot
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# image placed under /data we've created when previously installed
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#
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##########################################################################################
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##########################################################################################
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# Functions
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##########################################################################################
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# Pure bash dirname implementation
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getdir() {
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case "$1" in
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*/*) dir=${1%/*}; [ -z $dir ] && echo "/" || echo $dir ;;
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*) echo "." ;;
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esac
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}
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##########################################################################################
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# Initialization
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##########################################################################################
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if [ -z $SOURCEDMODE ]; then
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# Switch to the location of the script file
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cd "`getdir "${BASH_SOURCE:-$0}"`"
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# Load utility functions
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. ./util_functions.sh
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fi
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BOOTIMAGE="$1"
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[ -e "$BOOTIMAGE" ] || abort "$BOOTIMAGE does not exist!"
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# Flags
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[ -z $KEEPVERITY ] && KEEPVERITY=false
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[ -z $KEEPFORCEENCRYPT ] && KEEPFORCEENCRYPT=false
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[ -z $RECOVERYMODE ] && RECOVERYMODE=false
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chmod -R 755 .
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# Extract magisk if doesn't exist
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[ -e magisk ] || ./magiskinit -x magisk magisk
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##########################################################################################
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# Unpack
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##########################################################################################
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CHROMEOS=false
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ui_print "- Unpacking boot image"
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./magiskboot unpack "$BOOTIMAGE"
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case $? in
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1 )
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abort "! Unsupported/Unknown image format"
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;;
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2 )
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ui_print "- ChromeOS boot image detected"
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CHROMEOS=true
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;;
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esac
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##########################################################################################
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# Ramdisk restores
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##########################################################################################
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# Test patch status and do restore
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ui_print "- Checking ramdisk status"
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if [ -e ramdisk.cpio ]; then
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./magiskboot cpio ramdisk.cpio test
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STATUS=$?
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else
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# Stock A only system-as-root
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STATUS=0
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fi
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case $((STATUS & 3)) in
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0 ) # Stock boot
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ui_print "- Stock boot image detected"
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ui_print "- Backing up stock boot image"
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SHA1=`./magiskboot --sha1 "$BOOTIMAGE" 2>/dev/null`
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STOCKDUMP=stock_boot_${SHA1}.img.gz
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./magiskboot compress "$BOOTIMAGE" $STOCKDUMP
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cp -af ramdisk.cpio ramdisk.cpio.orig 2>/dev/null
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;;
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1 ) # Magisk patched
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ui_print "- Magisk patched boot image detected"
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# Find SHA1 of stock boot image
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[ -z $SHA1 ] && SHA1=`./magiskboot --cpio ramdisk.cpio sha1 2>/dev/null`
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./magiskboot cpio ramdisk.cpio restore
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if ./magiskboot cpio ramdisk.cpio "exists init.rc"; then
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# Normal boot image
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cp -af ramdisk.cpio ramdisk.cpio.orig
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else
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# A only system-as-root
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rm -f ramdisk.cpio
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fi
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;;
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2 ) # Unsupported
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ui_print "! Boot image patched by unsupported programs"
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abort "! Please restore back to stock boot image"
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;;
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esac
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##########################################################################################
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# Ramdisk patches
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##########################################################################################
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ui_print "- Patching ramdisk"
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echo "KEEPVERITY=$KEEPVERITY" > config
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echo "KEEPFORCEENCRYPT=$KEEPFORCEENCRYPT" >> config
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[ ! -z $SHA1 ] && echo "SHA1=$SHA1" >> config
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[ -f recovery_dtbo ] && echo "RECOVERYMODE=true" >> config
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./magiskboot cpio ramdisk.cpio \
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"add 750 init magiskinit" \
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"patch $KEEPVERITY $KEEPFORCEENCRYPT" \
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"backup ramdisk.cpio.orig" \
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"mkdir 000 .backup" \
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"add 000 .backup/.magisk config"
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if [ $((STATUS & 4)) -ne 0 ]; then
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ui_print "- Compressing ramdisk"
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./magiskboot --cpio ramdisk.cpio compress
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fi
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rm -f ramdisk.cpio.orig config
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##########################################################################################
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# Binary patches
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##########################################################################################
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if ! $KEEPVERITY; then
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for dt in dtb kernel_dtb extra recovery_dtbo; do
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[ -f $dt ] && ./magiskboot dtb-patch $dt && ui_print "- Removing dm(avb)-verity in $dt"
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done
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fi
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if [ -f kernel ]; then
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# Remove Samsung RKP
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./magiskboot hexpatch kernel \
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49010054011440B93FA00F71E9000054010840B93FA00F7189000054001840B91FA00F7188010054 \
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A1020054011440B93FA00F7140020054010840B93FA00F71E0010054001840B91FA00F7181010054
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# Remove Samsung defex
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# Before: [mov w2, #-221] (-__NR_execve)
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# After: [mov w2, #-32768]
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./magiskboot hexpatch kernel 821B8012 E2FF8F12
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# Force kernel to load rootfs
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# skip_initramfs -> want_initramfs
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./magiskboot hexpatch kernel \
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736B69705F696E697472616D667300 \
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77616E745F696E697472616D667300
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fi
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##########################################################################################
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# Repack and flash
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##########################################################################################
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ui_print "- Repacking boot image"
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./magiskboot repack "$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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# Reset any error code
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true
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