安卓玩机----解锁system分区可读写系统分区 magisk面具模块

2024-11-13 来源：个人技术集锦

玩机教程----安卓机型解锁system分区任意修改删除系统文件

system分区可读写

参考上个博文可以了解到解锁system分区的有关常识。但目前很多机型都在安卓12 13 基础上。其实最简单的方法就在于刷写一个解锁system分区的第三方补丁包。在面具更新不能解锁系统分区的前提下。我们也可以通过刷写一个解锁模块来达到解锁分区的目的。

测试机型与信息

机型;小米11

芯片：骁龙888

安卓版本：安卓13

面具模块：Magisk Overlayfs

系统版本：miui14

操作步骤为：

解锁bl后有面具root权限。这个可以参考自己机型的解锁bl与root方法操作

然后在面具里刷入此模块。

重启后，查看模块运行开启正常。此时就可以任意系统分区读写。使用re管理器可以直观查看效果

操作效果

目前就可以任意删减系统分区文件。

部分源代码如下：

SKIPUNZIP=1

if [ "$BOOTMODE" ] && [ "$KSU" ]; then
    ui_print "- Installing from KernelSU app"
    ui_print "- KernelSU version: $KSU_KERNEL_VER_CODE (kernel) + $KSU_VER_CODE (ksud)"
    ui_print "- Please note that KernelSU modules mount will make"
    ui_print "  your system partitions unable to mount as rw"
    ui_print "- If you are using KernelSU, "
    ui_print "  please unmount all ksu overlayfs"
    ui_print "  when you want to modify system partitions"
elif [ "$BOOTMODE" ] && [ "$MAGISK_VER_CODE" ]; then
    ui_print "- Installing from Magisk app"
else
    ui_print "*********************************************************"
    ui_print "! Install from recovery is not supported"
    ui_print "! Please install from KernelSU or Magisk app"
    abort    "*********************************************************"
fi

loop_setup() {
  unset LOOPDEV
  local LOOP
  local MINORX=1
  [ -e /dev/block/loop1 ] && MINORX=$(stat -Lc '%T' /dev/block/loop1)
  local NUM=0
  while [ $NUM -lt 1024 ]; do
    LOOP=/dev/block/loop$NUM
    [ -e $LOOP ] || mknod $LOOP b 7 $((NUM * MINORX))
    if losetup $LOOP "$1" 2>/dev/null; then
      LOOPDEV=$LOOP
      break
    fi
    NUM=$((NUM + 1))
  done
}

randdir="$TMPDIR/.$(head -c21 /dev/urandom | base64)"
mkdir -p "$randdir"

ABI="$(getprop ro.product.cpu.abi)"

# Fix ABI detection
if [ "$ABI" == "armeabi-v7a" ]; then
  ABI32=armeabi-v7a
elif [ "$ABI" == "arm64" ]; then
  ABI32=armeabi-v7a
elif [ "$ABI" == "x86" ]; then
  ABI32=x86
elif [ "$ABI" == "x64" ] || [ "$ABI" == "x86_64" ]; then
  ABI=x86_64
  ABI32=x86
fi

unzip -oj "$ZIPFILE" "libs/$ABI/overlayfs_system" -d "$TMPDIR" 1>&2
chmod 777 "$TMPDIR/overlayfs_system"

if ! $TMPDIR/overlayfs_system --test; then
    ui_print "! Kernel doesn't support overlayfs, are you sure?"
    abort
fi


ui_print "- Extract files"

unzip -oj "$ZIPFILE" post-fs-data.sh \
                     service.sh \
                     util_functions.sh \
                     mode.sh \
                     mount.sh \
                     uninstall.sh \
                     module.prop \
                     "libs/$ABI/overlayfs_system" \
                     -d "$MODPATH"
unzip -oj "$ZIPFILE" util_functions.sh  -d "/data/adb/modules/${MODPATH##*/}"

ui_print "- Setup module"

chmod 777 "$MODPATH/overlayfs_system"

resize_img() {
    e2fsck -pf "$1" || return 1
    if [ "$2" ]; then
        resize2fs "$1" "$2" || return 1
    else
        resize2fs -M "$1" || return 1
    fi
    return 0
}

test_mount_image() {
    loop_setup /data/adb/overlay
    [ -z "$LOOPDEV" ] && return 1
    result_mnt=1
    mount -t ext4 -o rw "$LOOPDEV" "$randdir" && \
    "$MODPATH/overlayfs_system" --test --check-ext4 "$randdir" && result_mnt=0
    # ensure that uppderdir does not override my binary
    rm -rf "$randdir/upper/system/bin/overlayfs_system" \
           "$randdir/upper/system/bin/magic_remount_rw" \
           "$randdir/upper/system/bin/magic_remount_ro"
    umount -l "$randdir"
    return $result_mnt
}

create_ext4_image() {
    dd if=/dev/zero of="$1" bs=1024 count=100
    /system/bin/mkfs.ext4 "$1" && return 0
    return 1
}

if [ ! -f "/data/adb/overlay" ] || ! test_mount_image; then
    rm -rf "/data/adb/overlay"
    ui_print "- Setup 2GB ext4 image at /data/adb/overlay"
    ui_print "  Please wait..."
    if ! create_ext4_image "/data/adb/overlay" || ! resize_img "/data/adb/overlay" 2000M || ! test_mount_image; then
        rm -rf /data/adb/overlay
        abort "! Setup ext4 image failed, abort"
    fi
fi

mkdir -p "$MODPATH/system/bin"
chcon -R u:object_r:system_file:s0 "$MODPATH/system"
chmod -R 755 "$MODPATH/system"

ln "$MODPATH/overlayfs_system" "$MODPATH/system/bin"
ln -s "./overlayfs_system" "$MODPATH/system/bin/magic_remount_rw"
ln -s "./overlayfs_system" "$MODPATH/system/bin/magic_remount_ro"
. "$MODPATH/util_functions.sh"
support_overlayfs && rm -rf "$MODPATH/system"

ui_print

MODDIR="${0%/*}"

set -o standalone

export MAGISKTMP="$(magisk --path)"

chmod 777 "$MODDIR/overlayfs_system"

OVERLAYDIR="/data/adb/overlay"
OVERLAYMNT="/dev/mount_overlayfs"
MODULEMNT="/dev/mount_loop"

mv -fT /cache/overlayfs.log /cache/overlayfs.log.bak
rm -rf /cache/overlayfs.log
echo "--- Start debugging log ---" >/cache/overlayfs.log
echo "init mount namespace: $(readlink /proc/1/ns/mnt)" >>/cache/overlayfs.log
echo "current mount namespace: $(readlink /proc/self/ns/mnt)" >>/cache/overlayfs.log

mkdir -p "$OVERLAYMNT"
mkdir -p "$OVERLAYDIR"
mkdir -p "$MODULEMNT"

mount -t tmpfs tmpfs "$MODULEMNT"

loop_setup() {
unset LOOPDEV
local LOOP
local MINORX=1
[ -e /dev/block/loop1 ] && MINORX=$(stat -Lc '%T' /dev/block/loop1)
local NUM=0
while [ $NUM -lt 2048 ]; do
LOOP=/dev/block/loop$NUM
[ -e $LOOP ] || mknod $LOOP b 7 $((NUM * MINORX))
if losetup $LOOP "$1" 2>/dev/null; then
LOOPDEV=$LOOP
break
fi
NUM=$((NUM + 1))
done
}

if [ -f "$OVERLAYDIR" ]; then
loop_setup /data/adb/overlay
if [ ! -z "$LOOPDEV" ]; then
mount -o rw -t ext4 "$LOOPDEV" "$OVERLAYMNT"
ln "$LOOPDEV" /dev/block/overlayfs_loop
fi
fi

if ! "$MODDIR/overlayfs_system" --test --check-ext4 "$OVERLAYMNT"; then
echo "unable to mount writeable dir" >>/cache/overlayfs.log
exit
fi

num=0

for i in /data/adb/modules/*; do
[ ! -e "$i" ] && break;
module_name="$(basename "$i")"
if [ ! -e "$i/disable" ] && [ ! -e "$i/remove" ]; then
if [ -f "$i/overlay.img" ]; then
loop_setup "$i/overlay.img"
if [ ! -z "$LOOPDEV" ]; then
echo "mount overlayfs for module: $module_name" >>/cache/overlayfs.log
mkdir -p "$MODULEMNT/$num"
mount -o rw -t ext4 "$LOOPDEV" "$MODULEMNT/$num"
fi
num="$((num+1))"
fi
if [ "$KSU" == "true" ]; then
mkdir -p "$MODULEMNT/$num"
mount --bind "$i" "$MODULEMNT/$num"
num="$((num+1))"
fi
fi
done

OVERLAYLIST=""

for i in "$MODULEMNT"/*; do
[ ! -e "$i" ] && break;
if [ -d "$i" ] && [ ! -L "$i" ] && "$MODDIR/overlayfs_system" --test --check-ext4 "$i"; then
OVERLAYLIST="$i:$OVERLAYLIST"
fi
done

mkdir -p "$OVERLAYMNT/upper"
rm -rf "$OVERLAYMNT/worker"
mkdir -p "$OVERLAYMNT/worker"

if [ ! -z "$OVERLAYLIST" ]; then
export OVERLAYLIST="${OVERLAYLIST::-1}"
echo "mount overlayfs list: [$OVERLAYLIST]" >>/cache/overlayfs.log
fi

# overlay_system <writeable-dir>
. "$MODDIR/mode.sh"
"$MODDIR/overlayfs_system" "$OVERLAYMNT" | tee -a /cache/overlayfs.log

if [ ! -z "$MAGISKTMP" ]; then
mkdir -p "$MAGISKTMP/overlayfs_mnt"
mount --bind "$OVERLAYMNT" "$MAGISKTMP/overlayfs_mnt"
fi

umount -l "$OVERLAYMNT"
rmdir "$OVERLAYMNT"
umount -l "$MODULEMNT"
rmdir "$MODULEMNT"

rm -rf /dev/.overlayfs_service_unblock
echo "--- Mountinfo (post-fs-data) ---" >>/cache/overlayfs.log
cat /proc/mounts >>/cache/overlayfs.log
(
# block until /dev/.overlayfs_service_unblock
while [ ! -e "/dev/.overlayfs_service_unblock" ]; do
sleep 1
done
rm -rf /dev/.overlayfs_service_unblock

echo "--- Mountinfo (late_start) ---" >>/cache/overlayfs.log
cat /proc/mounts >>/cache/overlayfs.log
) &

resize_img() {
    e2fsck -pf "$1" || return 1
    if [ "$2" ]; then
        resize2fs "$1" "$2" || return 1
    else
        resize2fs -M "$1" || return 1
    fi
    return 0
}

loop_setup() {
  unset LOOPDEV
  local LOOP
  local MINORX=1
  [ -e /dev/block/loop1 ] && MINORX=$(stat -Lc '%T' /dev/block/loop1)
  local NUM=0
  while [ $NUM -lt 2048 ]; do
    LOOP=/dev/block/loop$NUM
    [ -e $LOOP ] || mknod $LOOP b 7 $((NUM * MINORX))
    if losetup $LOOP "$1" 2>/dev/null; then
      LOOPDEV=$LOOP
      break
    fi
    NUM=$((NUM + 1))
  done
}

sizeof(){
    EXTRA="$2"
    [ -z "$EXTRA" ] && EXTRA=0
    [ "$EXTRA" -gt 0 ] || EXTRA=0
    size="$(du -s "$1" | awk '{ print $1 }')"
    # append more 20Mb
    size="$((size + EXTRA))"
    echo -n "$((size + 20000))"
}


handle() {
  if [ ! -L "/$1" ] && [ -d "/$1" ] && [ -d "$MODPATH/system/$1" ]; then
    rm -rf "$MODPATH/overlay/$1"
    mv -f "$MODPATH/overlay/system/$1" "$MODPATH/overlay"
    ln -s "../$1" "$MODPATH/overlay/system/$1"
  fi
}

create_ext4_image() {
    dd if=/dev/zero of="$1" bs=1024 count=100
    /system/bin/mkfs.ext4 "$1" && return 0
    return 1
}

support_overlayfs() {

#OVERLAY_IMAGE_EXTRA - number of kb need to be added to overlay.img
#OVERLAY_IMAGE_SHRINK - shrink overlay.img or not?

if [ -d "$MODPATH/system" ]; then
    OVERLAY_IMAGE_SIZE="$(sizeof "$MODPATH/system" "$OVERLAY_IMAGE_EXTRA")"
    rm -rf "$MODPATH/overlay.img"
    create_ext4_image "$MODPATH/overlay.img"
    resize_img "$MODPATH/overlay.img" "${OVERLAY_IMAGE_SIZE}M" || { ui_print "! Setup failed"; return 1; }
    ui_print "- Created overlay image with size: $(du -shH "$MODPATH/overlay.img" | awk '{ print $1 }')"
    loop_setup "$MODPATH/overlay.img"
    if [ ! -z "$LOOPDEV" ]; then
        rm -rf "$MODPATH/overlay"
        mkdir "$MODPATH/overlay"
        mount -t ext4 -o rw "$LOOPDEV" "$MODPATH/overlay"
        chcon u:object_r:system_file:s0 "$MODPATH/overlay"
        cp -afT "$MODPATH/system" "$MODPATH/overlay/system"
        # fix context
        ( cd "$MODPATH" || exit 
          find "system" | while read line; do
            chcon "$(ls -Zd "$line" | awk '{ print $1 }')" "$MODPATH/overlay/$line"
            if [ -e "$line/.replace" ]; then
              setfattr -n trusted.overlay.opaque -v y "$MODPATH/overlay/$line"
            fi
          done
        )
        
        # handle partition
        handle vendor
        handle product
        handle system_ext
        umount -l "$MODPATH/overlay"

        if [ "$OVERLAY_IMAGE_SHRINK" == "true" ] || [ -z "$OVERLAY_IMAGE_SHRINK" ]; then
          ui_print "- Shrink overlay image"
          resize_img "$MODPATH/overlay.img"
          ui_print "- Overlay image new size: $(du -shH "$MODPATH/overlay.img" | awk '{ print $1 }')"
        fi
        rm -rf "$MODPATH/overlay"
        return 0
    fi
fi

return 1
}

整体操作步骤还是比较简单。适合任意阶段的玩友使用。

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