kernel: added new prctl CMD_GET_MANAGER_UID to get the uid of the crowned manager

manager: show crowned manager uid in infocard when developer options is enabled

manager/app/src/main/java/com/rifsxd/ksunext/Natives.kt

@@ -28,6 +28,9 @@ object Natives {
     // 12569: support get hook mode
     const val MINIMAL_SUPPORTED_HOOK_MODE = 12569
 
+    // 12750: support get manager UID
+    const val MINIMAL_SUPPORTED_MANAGER_UID = 12751
+
     const val KERNEL_SU_DOMAIN = "u:r:su:s0"
 
     const val ROOT_UID = 0
@@ -54,6 +57,12 @@ object Natives {
 
     external fun uidShouldUmount(uid: Int): Boolean
 
+    /**
+     * Get the UID of the current root manager.
+     * @return manager UID, or -1 if unavailable.
+     */
+    external fun getManagerUid(): Int
+
     /**
      * Get a string indicating the SU hook mode enabled in kernel.
      * The return values are:

manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Home.kt

@@ -550,6 +550,8 @@ private fun InfoCard(autoExpand: Boolean = false) {
 
     var expanded by rememberSaveable { mutableStateOf(false) }
 
+    val developerOptionsEnabled = prefs.getBoolean("enable_developer_options", false)
+
     LaunchedEffect(autoExpand) {
         if (autoExpand) {
             expanded = true
@@ -598,7 +600,14 @@ private fun InfoCard(autoExpand: Boolean = false) {
                 val managerVersion = getManagerVersion(context)
                 InfoCardItem(
                     label = stringResource(R.string.home_manager_version),
-                    content = "${managerVersion.first} (${managerVersion.second})",
+                    content = if (
+                        developerOptionsEnabled &&
+                        Natives.version >= Natives.MINIMAL_SUPPORTED_MANAGER_UID
+                    ) {
+                        "${managerVersion.first} (${managerVersion.second}) | UID: ${Natives.getManagerUid()}"
+                    } else {
+                        "${managerVersion.first} (${managerVersion.second})"
+                    },
                     icon = painterResource(R.drawable.ic_ksu_next),
                 )