From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Micay <danielmicay@gmail.com>
Date: Sat, 26 Mar 2022 20:35:37 -0400
Subject: [PATCH] add exec spawning toggle

---
 res/values/strings.xml                        |   3 +
 res/xml/security_dashboard_settings.xml       |   6 +
 .../ExecSpawnPreferenceController.java        | 106 ++++++++++++++++++
 .../settings/security/SecuritySettings.java   |   1 +
 4 files changed, 116 insertions(+)
 create mode 100644 src/com/android/settings/security/ExecSpawnPreferenceController.java

diff --git a/res/values/strings.xml b/res/values/strings.xml
index 553d210a17..e090ad8a05 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -747,6 +747,9 @@
     <string name="auto_reboot_title">Auto reboot</string>
     <string name="auto_reboot_summary">Automatically reboot the device, if the phone hasn\'t been unlocked within the selected number of hours.</string>
 
+    <string name="exec_spawn_title">Enable secure app spawning</string>
+    <string name="exec_spawn_summary">Launch apps in a more secure way than Android which takes slightly longer and increases memory usage by app processes.</string>
+
     <string name="native_debug_title">Enable native code debugging</string>
     <string name="native_debug_summary">Generate useful logs / bug reports from crashes and permit debugging native code.</string>
 
diff --git a/res/xml/security_dashboard_settings.xml b/res/xml/security_dashboard_settings.xml
index 61e2db495a..3a06288497 100644
--- a/res/xml/security_dashboard_settings.xml
+++ b/res/xml/security_dashboard_settings.xml
@@ -69,6 +69,12 @@
             android:entries="@array/auto_reboot_entries"
             android:entryValues="@array/auto_reboot_values" />
 
+        <SwitchPreference
+            android:key="exec_spawn"
+            android:title="@string/exec_spawn_title"
+            android:summary="@string/exec_spawn_summary"
+            android:persistent="false" />
+
         <SwitchPreference
             android:key="native_debug"
             android:title="@string/native_debug_title"
diff --git a/src/com/android/settings/security/ExecSpawnPreferenceController.java b/src/com/android/settings/security/ExecSpawnPreferenceController.java
new file mode 100644
index 0000000000..98cc3c29e1
--- /dev/null
+++ b/src/com/android/settings/security/ExecSpawnPreferenceController.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.security;
+
+import android.content.Context;
+
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.os.SystemProperties;
+
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.TwoStatePreference;
+import androidx.preference.SwitchPreference;
+
+import com.android.internal.widget.LockPatternUtils;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+public class ExecSpawnPreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin, OnResume, Preference.OnPreferenceChangeListener {
+
+    private static final String SYS_KEY_EXEC_SPAWN = "persist.security.exec_spawn_new";
+    private static final String PREF_KEY_EXEC_SPAWN = "exec_spawn";
+    private static final String PREF_KEY_SECURITY_CATEGORY = "security_category";
+
+    private PreferenceCategory mSecurityCategory;
+    private SwitchPreference mExecSpawn;
+    private boolean mIsAdmin;
+    private UserManager mUm;
+
+    public ExecSpawnPreferenceController(Context context) {
+        super(context);
+        mUm = UserManager.get(context);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mSecurityCategory = screen.findPreference(PREF_KEY_SECURITY_CATEGORY);
+        updatePreferenceState();
+    }
+
+    @Override
+    public boolean isAvailable() {
+        mIsAdmin = mUm.isAdminUser();
+        return mIsAdmin;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY_EXEC_SPAWN;
+    }
+
+    // TODO: should we use onCreatePreferences() instead?
+    private void updatePreferenceState() {
+        if (mSecurityCategory == null) {
+            return;
+        }
+
+        if (mIsAdmin) {
+            mExecSpawn = (SwitchPreference) mSecurityCategory.findPreference(PREF_KEY_EXEC_SPAWN);
+            mExecSpawn.setChecked(SystemProperties.getBoolean(SYS_KEY_EXEC_SPAWN, false));
+        } else {
+            mSecurityCategory.removePreference(mSecurityCategory.findPreference(PREF_KEY_EXEC_SPAWN));
+        }
+    }
+
+    @Override
+    public void onResume() {
+        updatePreferenceState();
+        if (mExecSpawn != null) {
+                boolean mode = mExecSpawn.isChecked();
+                SystemProperties.set(SYS_KEY_EXEC_SPAWN, Boolean.toString(mode));
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object value) {
+        final String key = preference.getKey();
+        if (PREF_KEY_EXEC_SPAWN.equals(key)) {
+            final boolean mode = !mExecSpawn.isChecked();
+            SystemProperties.set(SYS_KEY_EXEC_SPAWN, Boolean.toString(mode));
+        }
+        return true;
+    }
+}
diff --git a/src/com/android/settings/security/SecuritySettings.java b/src/com/android/settings/security/SecuritySettings.java
index ecf8f02e9d..e48164ae62 100644
--- a/src/com/android/settings/security/SecuritySettings.java
+++ b/src/com/android/settings/security/SecuritySettings.java
@@ -106,6 +106,7 @@ public class SecuritySettings extends DashboardFragment {
                 context, lifecycle));
         securityPreferenceControllers.add(new ChangeScreenLockPreferenceController(context, host));
         securityPreferenceControllers.add(new AutoRebootPreferenceController(context));
+        securityPreferenceControllers.add(new ExecSpawnPreferenceController(context));
         securityPreferenceControllers.add(new NativeDebugPreferenceController(context));
         controllers.add(new PreferenceCategoryController(context, SECURITY_CATEGORY)
                 .setChildren(securityPreferenceControllers));