android10.0(Q) MTK 6765 user版本打开root权限

前言

相比较 Android8.1、9.0 而言，Android10.0 版本的 root变得相当麻烦，10.0 中引入了动态分区机制，同样的要想完全 adb root，需要 fastboot 解锁，然后关闭 verity 才能 adb remount 成功。我尝试和之前一样修改 fstab.in.mt6765 中的 ro 和 rw 初始值，容易导致无法正常开机，在这耗费了很长时间，就暂时先跳过吧，apk root 是 ok的。

环境

名称	版本
Android版本	10.0
平台	MTK6766

先放一张图

修改方案

上面的图就不用我多说了吧，分别用了 ROOT检测工具、RE文件管理器测试，只要 root 成功都有明显的提示，总共修改 12 个文件，新增 3 个文件，一共 15 个

	modified:   build/make/core/main.mk
	modified:   device/mediatek/sepolicy/basic/non_plat/file_contexts
	modified:   device/mediateksample/k62v1_64_bsp/device.mk
	modified:   vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k62v1_64_bsp/k62v1_64_bsp.mk
	modified:   system/core/adb/Android.bp
	modified:   system/core/adb/daemon/main.cpp
	modified:   system/core/init/selinux.cpp
	modified:   system/core/libcutils/fs_config.cpp
	modified:   system/core/rootdir/init.rc
	modified:   system/sepolicy/Android.mk
	modified:   system/sepolicy/prebuilts/api/29.0/public/domain.te
	modified:   system/sepolicy/public/domain.te

	add device/mediatek/sepolicy/basic/non_plat/suproce.te
	add system/extras/su/su
	add system/extras/su/suproce.sh

1.让进程名称在 AS Logcat 中可见，通过修改 ro.adb.secure 和 ro.secure

ps：这步不是必须的，目的只是在 logcat 中可见进程 pid 和包名，而且打开 USB 调试时默认授权，不再弹授权框

build/make/core/main.mk

 tags_to_install :=
 ifneq (,$(user_variant))
   # Target is secure in user builds.
-  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
+  # ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=1
+  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
   ADDITIONAL_DEFAULT_PROPERTIES += security.perf_harden=1
 
   ifeq ($(user_variant),user)
-    ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=1
+    # ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=1
+    ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=0
   endif
 
   ifeq ($(user_variant),userdebug)
@@ -251,7 +253,7 @@ ifneq (,$(user_variant))
     tags_to_install += debug
   else
     # Disable debugging in plain user builds.
-    enable_target_debugging :=
+    # enable_target_debugging :=
   endif
 
   # Disallow mock locations by default for user builds

2.修改 SELinux权限为 Permissive

SELinux 常用状态有两个 Permissive 和 Enforcing，通过 adb shell getenforce 可查看当前所处模式
10.0 改到了 selinux.cpp 中

system/core/init/selinux.cpp

 bool IsEnforcing() {
+    return false;
     if (ALLOW_PERMISSIVE_SELINUX) {
         return StatusFromCmdline() == SELINUX_ENFORCING;
     }

3.关闭 DM-verity

vendor/mediatek/proprietary/bootable/bootloader/preloader/custom/k62v1_64_bsp/k62v1_64_bsp.mk

 TARGET=k62v1_64_bsp
 MTK_PLATFORM=MT6765
 MTK_SEC_CHIP_SUPPORT=yes
-MTK_SEC_USBDL=ATTR_SUSBDL_ONLY_ENABLE_ON_SCHIP
-MTK_SEC_BOOT=ATTR_SBOOT_ENABLE
+MTK_SEC_USBDL=ATTR_SUSBDL_DISABLE
+MTK_SEC_BOOT=ATTR_SBOOT_DISABLE
 MTK_SEC_MODEM_AUTH=no
 MTK_SEC_SECRO_AC_SUPPORT=yes
 # Platform

4.增加 su 相关，确保 apk root 权限

apk 获取 root 权限，需要内置 su 文件，参考之前 8.1 的做法，在 init.rc 中 boot_completed 时执行脚本

开机执行脚本的命令可直接加在 system/core/rootdir/init.rc

开机脚本执行是否成功，可通过 adb shell dmesg > dmesg.txt 抓取 init 的日志，搜索是否报错，或者缺少权限。

boot_completed 启动完成时，start suproce

system/core/rootdir/init.rc

     class_reset main
 
+service suproce  /system/bin/suproce.sh
+    class main
+    user root
+    group root
+    oneshot
+    seclabel u:object_r:suproce_exec:s0
+
+
 on property:sys.boot_completed=1
+    start suproce
     bootchart stop

system/extras/su/suproce.sh

#!/system/bin/sh


mount -o rw,remount /system
chmod 06755 su
su --daemon

echo "su daemon done."

device/mediatek/sepolicy/basic/non_plat/file_contexts

 #hidl process merging
 /(system\/vendor|vendor)/bin/hw/merged_hal_service          u:object_r:merged_hal_service_exec:s0
+
+#suproce
+/system/bin/suproce.sh          u:object_r:suproce_exec:s0

此处写法有变动，suproce.te 中要加 system_file_type，不然编译时报错

out/target/product/k62v1_64_bsp/obj/ETC/sepolicy_tests_intermediates/sepolicy_tests )"
The following types on /system/ must be associated with the "system_file_type" attribute: suproce_exec
checkpolicy:  error(s) encountered while parsing configuration

device/mediatek/sepolicy/basic/non_plat/suproce.te

type suproce, coredomain;
 
#type suproce_exec, exec_type, vendor_file_type, file_type;
type  suproce_exec, exec_type, file_type, system_file_type;
 
# permissive suproce;
# allow shell suproce_exec:file { read open getattr execute };
 
init_daemon_domain(suproce);

改完后继续编译，再次出现新错误，user 版本不允许 permissive domains

[ 19% 1135/5824] build out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy
FAILED: out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy
/bin/bash -c "(ASAN_OPTIONS=detect_leaks=0 out/host/linux-x86/bin/checkpolicy -M -c 		30 -o out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.tmp out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.recovery.conf ) && (out/host/linux-x86/bin/sepolicy-analyze out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.tmp permissive > out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.permissivedomains ) && (if [ \"user\" = \"user\" -a -s out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.permissivedomains ]; then 		echo \"==========\" 1>&2; 		echo \"ERROR: permissive domains not allowed in user builds\" 1>&2; 		echo \"List of invalid domains:\" 1>&2; 		cat out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.permissivedomains 1>&2; 		exit 1; 		fi ) && (mv out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy.tmp out/target/product/k62v1_64_bsp/obj/ETC/sepolicy.recovery_intermediates/sepolicy )"
device/mediatek/sepolicy/bsp/plat_private/untrusted_app_all.te:7:WARNING 'unrecognized character' at token '' on line 53889:
# Purpose: Make app can get phoneEx

注释下面文件中的 exit 1

system/sepolicy/Android.mk

@@ -518,7 +518,7 @@ $(LOCAL_BUILT_MODULE): $(HOST_OUT_EXECUTABLES)/secilc $(HOST_OUT_EXECUTABLES)/se
                echo "ERROR: permissive domains not allowed in user builds" 1>&2; \
                echo "List of invalid domains:" 1>&2; \
                cat $@.permissivedomains 1>&2; \
-               exit 1; \
+               # exit 1; \
                fi
        $(hide) mv $@.tmp $@
 
@@ -562,7 +562,7 @@ $(LOCAL_BUILT_MODULE): $(sepolicy.recovery.conf) $(HOST_OUT_EXECUTABLES)/checkpo
                echo "ERROR: permissive domains not allowed in user builds" 1>&2; \
                echo "List of invalid domains:" 1>&2; \
                cat $@.permissivedomains 1>&2; \
-               exit 1; \
+               # exit 1; \
                fi
        $(hide) mv $@.tmp $@

再重新编译，又报错，卧底马，什么情况, 在 system/sepolicy/public/domain.te 中 335 行进行了权限检查

libsepol.report_assertion_extended_permissions: neverallowxperm on line 335 of system/sepolicy/public/domain.te (or line 11735 of policy.conf) violated by allow aee_aed suproce_exec:file { ioctl };
libsepol.report_assertion_extended_permissions: neverallowxperm on line 335 of system/sepolicy/public/domain.te (or line 11735 of policy.conf) violated by allow crash_dump suproce_exec:file { ioctl };
libsepol.check_assertions: 2 neverallow failures occurred
Error while expanding policy

libsepol.report_assertion_extended_permissions: neverallowxperm on line 335 of system/sepolicy/public/domain.te (or line 11642 of policy.conf) violated by allow aee_aed suproce_exec:file { ioctl };
libsepol.report_assertion_extended_permissions: neverallowxperm on line 335 of system/sepolicy/public/domain.te (or line 11642 of policy.conf) violated by allow crash_dump suproce_exec:file { ioctl };
libsepol.check_assertions: 2 neverallow failures occurred
Error while expanding policy

system/sepolicy/public/domain.te
system/sepolicy/prebuilts/api/29.0/public/domain.te

# All ioctls on file-like objects (except chr_file and blk_file) and
# sockets must be restricted to a whitelist.
# neverallowxperm * *:{ dir notdevfile_class_set socket_class_set blk_file } ioctl { 0 };

直接将 neverallowxperm * *:{ dir notdevfile_class_set socket_class_set blk_file } ioctl { 0 }; 这行注释就行，不过需要两个文件都注释，

开始按照忽略原则将 aee_aed、crash_dump 通过 - 的方式修改，又报其它错误(宝宝心里苦啊)

*neverallowxperm { * -aee_aed -crash_dump } :{ dir notdevfile_class_set socket_class_set blk_file } ioctl { 0 }; 这样行不通

拷贝 su 文件和开机脚本 suproce.sh 到 system/bin 目录下
device/mediateksample/k62v1_64_bsp/device.mk

@@ -19,6 +19,11 @@ PRODUCT_COPY_FILES += $(LOCAL_PATH)/sbk-kpd.kl:system/usr/keylayout/sbk-kpd.kl:m
                       $(LOCAL_PATH)/sbk-kpd.kcm:system/usr/keychars/sbk-kpd.kcm:mtk
 endif
 
+PRODUCT_COPY_FILES += \
+       system/extras/su/su:system/bin/su \
+       system/extras/su/suproce.sh:system/bin/suproce.sh

给 su 文件增加权限

system/core/libcutils/fs_config.cpp

@@ -166,7 +168,9 @@ static const struct fs_path_config android_files[] = {
     // the following two files are INTENTIONALLY set-uid, but they
     // are NOT included on user builds.
     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },
-    { 04750, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },
+    { 06755, AID_ROOT,      AID_SHELL,     0, "system/bin/su" },

 
     // the following files have enhanced capabilities and ARE included
     // in user builds.

5.解锁 fastboot，并关闭 verity 按需操作

system/core/adb/Android.bp

@@ -76,7 +76,15 @@ cc_defaults {
     name: "adbd_defaults",
     defaults: ["adb_defaults"],
 
-    cflags: ["-UADB_HOST", "-DADB_HOST=0"],
+    //cflags: ["-UADB_HOST", "-DADB_HOST=0"],
+    cflags: [
+        "-UADB_HOST",
+        "-DADB_HOST=0",
+        "-UALLOW_ADBD_ROOT",
+        "-DALLOW_ADBD_ROOT=1",
+        "-DALLOW_ADBD_DISABLE_VERITY",
+        "-DALLOW_ADBD_NO_AUTH",
+    ],
     product_variables: {
         debuggable: {
             cflags: [

system/core/adb/daemon/main.cpp

@@ -63,12 +63,13 @@ static inline bool is_device_unlocked() {
 }
 
 static bool should_drop_capabilities_bounding_set() {
-    if (ALLOW_ADBD_ROOT || is_device_unlocked()) {
+    /*if (ALLOW_ADBD_ROOT || is_device_unlocked()) {
         if (__android_log_is_debuggable()) {
             return false;
         }
     }
-    return true;
+    return true;*/
+    return false;
 }
 
 static bool should_drop_privileges() {

解锁时可能音量上键不生效，那需要进行对调

vendor/mediatek/proprietary/bootable/bootloader/lk/app/mt_boot/sec_unlock.c

        unlock_warranty();
 
        while (1) {
-               if (mtk_detect_key(MT65XX_MENU_SELECT_KEY)) { //VOL_UP
+               //if (mtk_detect_key(MT65XX_MENU_SELECT_KEY)) { //VOL_UP
+               if (mtk_detect_key(MT65XX_MENU_OK_KEY)) { //VOL_DOWN
                        fastboot_info("Start unlock flow\n");
                        //Invoke security check after confirming "yes" by user
                        ret = fastboot_get_unlock_perm(&unlock_allowed);
@@ -374,7 +375,8 @@ void fastboot_oem_unlock(const char *arg, void *data, unsigned sz)
                                fastboot_okay("");
                        }
                        break;
-               } else if (mtk_detect_key(MT65XX_MENU_OK_KEY)) { //VOL_DOWN
+               //} else if (mtk_detect_key(MT65XX_MENU_OK_KEY)) { //VOL_DOWN
+               } else if (mtk_detect_key(MT65XX_MENU_SELECT_KEY)) { //VOL_UP
                        video_printf("return to fastboot in 3s\n");
                        mdelay(3000);
                        fastboot_boot_menu();

去除 oem 解锁后每次开机提示 Your device has been unlocked and can’t be trusted 警告字眼

vendor/mediatek/proprietary/bootable/bootloader/lk/platform/common/boot/vboot_state.c

@@ -133,9 +133,10 @@ int orange_state_warning(void)
 
        video_clean_screen();
        video_set_cursor(video_get_rows() / 2, 0);
-       video_printf(title_msg);
-       video_printf("Your device has been unlocked and can't be trusted\n");
-       video_printf("Your device will boot in 5 seconds\n");
+       //20191206  annotaion 
+       // video_printf(title_msg);
+       // video_printf("Your device has been unlocked and can't be trusted\n");
+       // video_printf("Your device will boot in 5 seconds\n");
        mtk_wdt_restart();
        mdelay(5000);
        mtk_wdt_restart();

获取 adb root 权限, user 版本目前还不能 remount 成功， userdebug 版本可成功 remount，

后续 user 版本 adb 成功后会持续更新，以下是操作比对

=user==========
C:>adb root

C:>adb remount
/system/bin/remount exited with status 2
remount failed

C:>adb disable-verity
Device is locked. Please unlock the device first

C:>adb reboot bootloader

C:>fastboot flashing unlock
…
(bootloader) Start unlock flow

OKAY [ 12.394s]
finished. total time: 12.398s

C:>fastboot reboot
rebooting…

finished. total time: 0.003s

C:>adb root

C:>adb disable-verity
Successfully disabled verity
Now reboot your device for settings to take effect

C:>adb reboot

C:>adb root

C:>adb remount
/system/bin/remount exited with status 2
remount failed

=userdebug==========

C:>adb root

C:>adb remount
E Skipping /system
E Skipping /vendor
E Skipping /product
W No partitions to remount
/system/bin/remount exited with status 7
remount failed

C:>adb disable-verity
Device is locked. Please unlock the device first

C:>adb reboot bootloader

C:>fastboot flashing unlock
…
(bootloader) Start unlock flow

OKAY [ 12.394s]
finished. total time: 12.398s

C:>fastboot reboot
rebooting…

finished. total time: 0.003s

C:>adb root

C:>adb disable-verity
Successfully disabled verity
Now reboot your device for settings to take effect

C:>adb reboot

C:>adb root

C:>adb remount
remount succeeded

user 版本已成功获取 adb root

6.修改 adb root 权限，编译 userdebug 版本进行比对

user 和 userdebug 区别在于 remount 时感觉走的地方不太一样，userdebug remount 时打印的日志来自 system\core\fs_mgr\fs_mgr_remount.cpp

思路为只要让 user 版本下 remount 时打印一样的日志即可

修改文件清单

	modified:   system/core/adb/Android.bp
	modified:   system/core/fs_mgr/Android.bp
	modified:   system/sepolicy/Android.mk
	modified:   system/sepolicy/definitions.mk
	modified:   frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

system/core/adb/Android.bp

+++ b/alps/system/core/adb/Android.bp
@@ -412,6 +412,8 @@ cc_library {
         "liblog",
     ],
 
+    required: [ "remount",],
+
     product_variables: {
         debuggable: {
             required: [

system/core/fs_mgr/Android.bp

+++ b/alps/system/core/fs_mgr/Android.bp
@@ -76,7 +76,8 @@ cc_library {
         "libfstab",
     ],
     cppflags: [
-        "-DALLOW_ADBD_DISABLE_VERITY=0",
+        "-UALLOW_ADBD_DISABLE_VERITY",
+        "-DALLOW_ADBD_DISABLE_VERITY=1",
     ],
     product_variables: {
         debuggable: {
@@ -133,7 +134,8 @@ cc_binary {
         "fs_mgr_remount.cpp",
     ],
     cppflags: [
-        "-DALLOW_ADBD_DISABLE_VERITY=0",
+        "-UALLOW_ADBD_DISABLE_VERITY",
+        "-DALLOW_ADBD_DISABLE_VERITY=1",
     ],
     product_variables: {
         debuggable: {

user 版本启用 overlayfs 来装载 remount 对应分区
system/sepolicy/Android.mk

+++ b/alps/system/sepolicy/Android.mk
@@ -309,7 +309,7 @@ LOCAL_REQUIRED_MODULES += \
 
 endif
 
-ifneq ($(TARGET_BUILD_VARIANT), user)
+ifneq ($(TARGET_BUILD_VARIANT), eng)
 LOCAL_REQUIRED_MODULES += \
     selinux_denial_metadata \
 
@@ -1104,7 +1104,8 @@ endif
 ifneq ($(filter address,$(SANITIZE_TARGET)),)
   local_fc_files += $(wildcard $(addsuffix /file_contexts_asan, $(PLAT_PRIVATE_POLICY)))
 endif
-ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
+ifneq (,$(filter user userdebug eng,$(TARGET_BUILD_VARIANT)))
   local_fc_files += $(wildcard $(addsuffix /file_contexts_overlayfs, $(PLAT_PRIVATE_POLICY)))
 endif
 ifeq ($(TARGET_FLATTEN_APEX),true)
@@ -1166,7 +1167,9 @@ file_contexts.device.tmp :=
 file_contexts.local.tmp :=
 
 ##################################
-ifneq ($(TARGET_BUILD_VARIANT), user)
+# ifneq ($(TARGET_BUILD_VARIANT), user)
+ifneq ($(TARGET_BUILD_VARIANT), eng)
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := selinux_denial_metadata

system/sepolicy/definitions.mk

+++ b/alps/system/sepolicy/definitions.mk
@@ -1,10 +1,11 @@
 # Command to turn collection of policy files into a policy.conf file to be
 # processed by checkpolicy
 define transform-policy-to-conf
 @mkdir -p $(dir $@)
 $(hide) m4 --fatal-warnings $(PRIVATE_ADDITIONAL_M4DEFS) \
        -D mls_num_sens=$(PRIVATE_MLS_SENS) -D mls_num_cats=$(PRIVATE_MLS_CATS) \
-       -D target_build_variant=$(PRIVATE_TARGET_BUILD_VARIANT) \
+       -D target_build_variant=eng \
        -D target_with_dexpreopt=$(WITH_DEXPREOPT) \
        -D target_arch=$(PRIVATE_TGT_ARCH) \

默认开启 OEM 解锁选项

frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

+++ b/alps/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
@@ -995,6 +995,10 @@ public class UsbDeviceManager implements ActivityTaskManagerInternal.ScreenObser
         }
 
         protected void finishBoot() {
+            android.service.oemlock.OemLockManager mOemLockManager 
+            = (android.service.oemlock.OemLockManager) mContext.getSystemService(Context.OEM_LOCK_SERVICE);
+            mOemLockManager.setOemUnlockAllowedByUser(true);
+
             if (mBootCompleted && mCurrentUsbFunctionsReceived && mSystemReady) {
                 if (mPendingBootBroadcast) {
                     updateUsbStateBroadcastIfNeeded(getAppliedFunctions(mCurrentFunctions));

C:>adb root

C:>adb remount
W DM_DEV_STATUS failed for scratch: No such device or address
E [liblp]No device named scratch
[liblp]Partition scratch will resize from 0 bytes to 1315950592 bytes
[liblp]Updated logical partition table at slot 0 on device /dev/block/by-name/super
[libfs_mgr]Created logical partition scratch on device /dev/block/dm-3
[libfs_mgr]superblock s_max_mnt_count:65535,/dev/block/dm-3
[libfs_mgr]__mount(source=/dev/block/dm-3,target=/mnt/scratch,type=ext4)=0: Success
Using overlayfs for /system
Using overlayfs for /vendor
Using overlayfs for /product
[libfs_mgr]__mount(source=overlay,target=/system,type=overlay,upperdir=/mnt/scratch/overlay/system/upper)=0
[libfs_mgr]__mount(source=overlay,target=/vendor,type=overlay,upperdir=/mnt/scratch/overlay/vendor/upper)=0
[libfs_mgr]__mount(source=overlay,target=/product,type=overlay,upperdir=/mnt/scratch/overlay/product/upper)=0
remount succeeded