adb root

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diff --git a/alps_mssi/build/make/core/main.mk b/alps_mssi/build/make/core/main.mk
old mode 100644
new mode 100755
index c63c6dfde9e..6c8884ca62f
--- a/alps_mssi/build/make/core/main.mk
+++ b/alps_mssi/build/make/core/main.mk
@@ -365,11 +365,11 @@ enable_target_debugging := true
 tags_to_install :=
 ifneq (,$(user_variant))
   # Target is secure in user builds.
-  ADDITIONAL_SYSTEM_PROPERTIES += ro.secure=1
+  ADDITIONAL_SYSTEM_PROPERTIES += ro.secure=0
   ADDITIONAL_SYSTEM_PROPERTIES += security.perf_harden=1
 
   ifeq ($(user_variant),user)
-    ADDITIONAL_SYSTEM_PROPERTIES += ro.adb.secure=1
+    ADDITIONAL_SYSTEM_PROPERTIES += ro.adb.secure=0
   endif
 
   ifeq ($(user_variant),userdebug)
@@ -377,7 +377,7 @@ ifneq (,$(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

adb root是通过改变ro.secure和ro.adb.secure这两个属性值控制开关的，0是打开，这两个属性值改成0即可。按理说只需改两个属性值就可以实现adb root，但是不关闭selinux，开发者模式是进不去的，因此还要关闭selinux，关闭selinux有两种方法，但是原理都是一样的，如下：
第一种：

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diff --git a/alps_mssi/system/core/init/selinux.cpp b/alps_mssi/system/core/init/selinux.cpp
old mode 100644
new mode 100755
index 4d77d339592..74d8552dec7
--- a/alps_mssi/system/core/init/selinux.cpp
+++ b/alps_mssi/system/core/init/selinux.cpp
@@ -716,6 +716,7 @@ void ReadPolicy(std::string* policy) {
 void SelinuxSetEnforcement() {
     bool kernel_enforcing = (security_getenforce() == 1);
     bool is_enforcing = IsEnforcing();
+	is_enforcing = false;
     if (kernel_enforcing != is_enforcing) {
         if (security_setenforce(is_enforcing)) {
             PLOG(FATAL) << "security_setenforce(" << (is_enforcing ? "true" : "false")

第二种：

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

这两种方法的原理都是一样的，使is_enforcing为false即可，user版本关闭selinux会导致开不了机以及还会弹出一个“您的设备存在内部问题，有关详细信息，请联系您的制造商”的提示，下面解决关闭selinux开不了机的问题：

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diff --git a/alps_ap/device/mediateksample/tb8321p3_bsp/vnd_tb8321p3_bsp.mk b/alps_ap/device/mediateksample/tb8321p3_bsp/vnd_tb8321p3_bsp.mk
old mode 100644
new mode 100755
index bc0b54c1d5c..166bcd74670
--- a/alps_ap/device/mediateksample/tb8321p3_bsp/vnd_tb8321p3_bsp.mk
+++ b/alps_ap/device/mediateksample/tb8321p3_bsp/vnd_tb8321p3_bsp.mk
@@ -28,7 +28,7 @@ ifeq ($(TARGET_BUILD_VARIANT), eng)
 KERNEL_DEFCONFIG ?= tb8321p3_bsp_debug_defconfig
 endif
 ifeq ($(TARGET_BUILD_VARIANT), user)
-KERNEL_DEFCONFIG ?= tb8321p3_bsp_defconfig
+KERNEL_DEFCONFIG ?= tb8321p3_bsp_defconfig userdebug.config
 endif
 ifeq ($(TARGET_BUILD_VARIANT), userdebug)
 KERNEL_DEFCONFIG ?= tb8321p3_bsp_defconfig userdebug.config

关于提示问题根据字符串找到ActivityTaskManagerService.java这个类里面的d.setMessage(mUiContext.getText(R.string.system_error_manufacturer));这行代码用到了，把下面的显示给注释掉即可：