[高通MSM8953_64][Android10]user版本默认获取root权限

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我是靠谱客的博主冷艳小土豆，最近开发中收集的这篇文章主要介绍[高通MSM8953_64][Android10]user版本默认获取root权限，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

文章目录

- 开发平台基本信息
- 问题描述
- 解决方法

开发平台基本信息

芯片: MSM8953_64
版本: Android 10
kernel: msm-4.9

问题描述

user版本默认是不允许root以及remount的，但是，作为硬件定制厂商，客户往往需要root权限去执行一些系统级别的权限，所以，需要将user版本的root权限开放出来。

解决方法

diff --git a/build/make/core/main.mk b/build/make/core/main.mk
index c7df0f7..f09692b 100755
--- a/build/make/core/main.mk
+++ b/build/make/core/main.mk
@@ -283,11 +283,11 @@ enable_target_debugging := true
 tags_to_install :=
 ifneq (,$(user_variant))
   # Target is secure in user builds.
-  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=0
   endif
 
   # Fix by yubin.chen for remove debug app 2020-11-28 BEGIN #
@@ -296,7 +296,7 @@ ifneq (,$(user_variant))
     #tags_to_install += debug
   else
     # Disable debugging in plain user builds.
-    enable_target_debugging :=
+    #enable_target_debugging :=
   endif
   # Fix by yubin.chen for remove debug app 2020-11-28 END #
--- a/system/core/adb/Android.bp
+++ b/system/core/adb/Android.bp
@@ -76,7 +76,14 @@ cc_defaults {
     name: "adbd_defaults",
     defaults: ["adb_defaults"],
 
-    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: [
@@ -404,6 +411,8 @@ cc_library {
         "liblog",
     ],
 
+    required: [ "remount",],
+
     product_variables: {
         debuggable: {
             required: [
diff --git a/system/core/adb/daemon/main.cpp b/system/core/adb/daemon/main.cpp
index e5a4917..258ebbf 100644
--- a/system/core/adb/daemon/main.cpp
+++ b/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() {
diff --git a/system/core/fs_mgr/Android.bp b/system/core/fs_mgr/Android.bp
index 4ee9624..ebaa390 100644
--- a/system/core/fs_mgr/Android.bp
+++ b/system/core/fs_mgr/Android.bp
@@ -75,7 +75,8 @@ cc_library {
         "libfstab",
     ],
     cppflags: [
-        "-DALLOW_ADBD_DISABLE_VERITY=0",
+        "-UALLOW_ADBD_DISABLE_VERITY",
+        "-DALLOW_ADBD_DISABLE_VERITY=1",
     ],
     product_variables: {
         debuggable: {
@@ -132,7 +133,8 @@ cc_binary {
         "fs_mgr_remount.cpp",
     ],
     cppflags: [
-        "-DALLOW_ADBD_DISABLE_VERITY=0",
+        "-UALLOW_ADBD_DISABLE_VERITY",
+        "-DALLOW_ADBD_DISABLE_VERITY=1",
     ],
     product_variables: {
         debuggable: {
diff --git a/system/core/init/selinux.cpp b/system/core/init/selinux.cpp
index e0bccdf..65d15b2 100755
--- a/system/core/init/selinux.cpp
+++ b/system/core/init/selinux.cpp
@@ -97,6 +97,7 @@ EnforcingStatus StatusFromCmdline() {
 }
 
 bool IsEnforcing() {
+    return false;
     if (ALLOW_PERMISSIVE_SELINUX) {
         return StatusFromCmdline() == SELINUX_ENFORCING;
     }
diff --git a/system/sepolicy/Android.mk b/system/sepolicy/Android.mk
index dadd7b0..6b60569 100644
--- a/system/sepolicy/Android.mk
+++ b/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 +1104,7 @@ 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 +1166,7 @@ file_contexts.device.tmp :=
 file_contexts.local.tmp :=
 
 ##################################
-ifneq ($(TARGET_BUILD_VARIANT), user)
+ifneq ($(TARGET_BUILD_VARIANT), eng)
 include $(CLEAR_VARS)
 
 LOCAL_MODULE := selinux_denial_metadata