Rewrite hook for force mount data

The previous hook point is for startViaZygote(), but the logic in
ProcessList.java to determine whether a process is safe to apply
force mount is complex, and current implementation has already
caused issues. Change the hook point to PlatformCompat and force
return true for all sdk level, then we can let system server apply
the correct logic.

Vold app data isolation does not have sdk level check, so don't
touch current logic.

xposed/src/main/java/icu/nullptr/hidemyapplist/xposed/HMAService.kt

@@ -116,7 +116,7 @@ class HMAService(val pms: IPackageManager) : IHMAService.Stub() {
         }
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            frameworkHooks.add(ZygoteArgsHook(this))
+            frameworkHooks.add(PlatformCompatHook(this))
         }
 
         frameworkHooks.forEach(IFrameworkHook::load)

xposed/src/main/java/icu/nullptr/hidemyapplist/xposed/hook/ZygoteArgsHook.kt → xposed/src/main/java/icu/nullptr/hidemyapplist/xposed/hook/FrameworkCompatHook.kt

@@ -1,23 +1,22 @@
 package icu.nullptr.hidemyapplist.xposed.hook
 
 import android.annotation.TargetApi
+import android.content.pm.ApplicationInfo
 import android.os.Build
 import com.github.kyuubiran.ezxhelper.utils.findMethod
 import com.github.kyuubiran.ezxhelper.utils.hookBefore
 import de.robv.android.xposed.XC_MethodHook
 import icu.nullptr.hidemyapplist.common.CommonUtils
-import icu.nullptr.hidemyapplist.common.Constants.*
 import icu.nullptr.hidemyapplist.xposed.HMAService
 import icu.nullptr.hidemyapplist.xposed.logE
 import icu.nullptr.hidemyapplist.xposed.logI
 
 @TargetApi(Build.VERSION_CODES.S)
-class ZygoteArgsHook(private val service: HMAService) : IFrameworkHook {
+class PlatformCompatHook(private val service: HMAService) : IFrameworkHook {
 
     companion object {
-        private const val TAG = "ZygoteArgsHook"
+        private const val TAG = "PlatformCompatHook"
         private val sAppDataIsolationEnabled = CommonUtils.isAppDataIsolationEnabled
-        private val sVoldAppDataIsolationEnabled = CommonUtils.isVoldAppDataIsolationEnabled
     }
 
     private var hook: XC_MethodHook.Unhook? = null
@@ -26,19 +25,18 @@ class ZygoteArgsHook(private val service: HMAService) : IFrameworkHook {
         if (!service.config.forceMountData) return
         logI(TAG, "Load hook")
         logI(TAG, "App data isolation enabled: $sAppDataIsolationEnabled")
-        logI(TAG, "Vold app data isolation enabled: $sVoldAppDataIsolationEnabled")
-        hook = findMethod("android.os.ZygoteProcess") {
-            name == "startViaZygote"
+        hook = findMethod("com.android.server.compat.PlatformCompat") {
+            name == "isChangeEnabled"
         }.hookBefore { param ->
             runCatching {
-                val uid = param.args[2] as Int
-                if (uid == UID_SYSTEM) return@hookBefore
-                val apps = service.pms.getPackagesForUid(uid) ?: return@hookBefore
+                val changeId = param.args[0] as Long
+                val appInfo = param.args[1] as ApplicationInfo
+                if (changeId.toInt() != 143937733) return@hookBefore
+                val apps = service.pms.getPackagesForUid(appInfo.uid) ?: return@hookBefore
                 for (app in apps) {
                     if (service.isHookEnabled(app)) {
-                        if (sAppDataIsolationEnabled) param.args[20] = true // boolean bindMountAppsData
-                        if (sVoldAppDataIsolationEnabled) param.args[21] = true // boolean bindMountAppStorageDirs
-                        logI(TAG, "@startViaZygote force mount data: $uid $app")
+                        if (sAppDataIsolationEnabled) param.result = true
+                        logI(TAG, "@startViaZygote force mount data: $appInfo.uid $app")
                         return@hookBefore
                     }
                 }