manager: Add support to disable sucompat mode.

manager/app/src/main/cpp/jni.cc

@@ -296,3 +296,13 @@ JNIEXPORT jboolean JNICALL
 Java_me_weishu_kernelsu_Natives_uidShouldUmount(JNIEnv *env, jobject thiz, jint uid) {
     return uid_should_umount(uid);
 }
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_me_weishu_kernelsu_Natives_isSuEnabled(JNIEnv *env, jobject thiz) {
+    return is_su_enabled();
+}
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_me_weishu_kernelsu_Natives_setSuEnabled(JNIEnv *env, jobject thiz, jboolean enabled) {
+    return set_su_enabled(enabled);
+}

manager/app/src/main/cpp/ksu.cc

@@ -27,6 +27,8 @@
 
 #define CMD_IS_UID_GRANTED_ROOT 12
 #define CMD_IS_UID_SHOULD_UMOUNT 13
+#define CMD_IS_SU_ENABLED 14
+#define CMD_ENABLE_SU 15
 
 static bool ksuctl(int cmd, void* arg1, void* arg2) {
     int32_t result = 0;
@@ -84,3 +86,14 @@ bool set_app_profile(const app_profile *profile) {
 bool get_app_profile(p_key_t key, app_profile *profile) {
     return ksuctl(CMD_GET_APP_PROFILE, (void*) profile, nullptr);
 }
+
+bool set_su_enabled(bool enabled) {
+    return ksuctl(CMD_ENABLE_SU, (void*) enabled, nullptr);
+}
+
+bool is_su_enabled() {
+    bool enabled = true;
+    // if ksuctl failed, we assume su is enabled, and it cannot be disabled.
+    ksuctl(CMD_IS_SU_ENABLED, &enabled, nullptr);
+    return enabled;
+}

manager/app/src/main/cpp/ksu.h

@@ -79,4 +79,8 @@ bool set_app_profile(const app_profile *profile);
 
 bool get_app_profile(p_key_t key, app_profile *profile);
 
+bool set_su_enabled(bool enabled);
+
+bool is_su_enabled();
+
 #endif //KERNELSU_KSU_H

manager/app/src/main/java/me/weishu/kernelsu/Natives.kt

@@ -21,6 +21,9 @@ object Natives {
     // 11640: Support query working mode, LKM or GKI
     // when MINIMAL_SUPPORTED_KERNEL > 11640, we can remove this constant.
     const val MINIMAL_SUPPORTED_KERNEL_LKM = 11648
+
+    // 12040: Support disable sucompat mode
+    const val MINIMAL_SUPPORTED_SU_COMPAT = 12040
     const val KERNEL_SU_DOMAIN = "u:r:su:s0"
 
     const val ROOT_UID = 0
@@ -55,6 +58,15 @@ object Natives {
     external fun getAppProfile(key: String?, uid: Int): Profile
     external fun setAppProfile(profile: Profile?): Boolean
 
+    /**
+     * `su` compat mode can be disabled temporarily.
+     *  0: disabled
+     *  1: enabled
+     *  negative : error
+     */
+    external fun isSuEnabled(): Boolean
+    external fun setSuEnabled(enabled: Boolean): Boolean
+
     private const val NON_ROOT_DEFAULT_PROFILE_KEY = "$"
     private const val NOBODY_UID = 9999
 

manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Settings.kt

@@ -27,6 +27,7 @@ import androidx.compose.material.icons.filled.Delete
 import androidx.compose.material.icons.filled.DeleteForever
 import androidx.compose.material.icons.filled.DeveloperMode
 import androidx.compose.material.icons.filled.Fence
+import androidx.compose.material.icons.filled.FolderDelete
 import androidx.compose.material.icons.filled.RemoveModerator
 import androidx.compose.material.icons.filled.Save
 import androidx.compose.material.icons.filled.Share
@@ -161,7 +162,7 @@ fun SettingScreen(navigator: DestinationsNavigator) {
                 mutableStateOf(Natives.isDefaultUmountModules())
             }
             SwitchItem(
-                icon = Icons.Filled.RemoveModerator,
+                icon = Icons.Filled.FolderDelete,
                 title = stringResource(id = R.string.settings_umount_modules_default),
                 summary = stringResource(id = R.string.settings_umount_modules_default_summary),
                 checked = umountChecked
@@ -171,6 +172,24 @@ fun SettingScreen(navigator: DestinationsNavigator) {
                 }
             }
 
+            if (Natives.version >= Natives.MINIMAL_SUPPORTED_SU_COMPAT) {
+                var isSuDisabled by rememberSaveable {
+                    mutableStateOf(!Natives.isSuEnabled())
+                }
+                SwitchItem(
+                    icon = Icons.Filled.RemoveModerator,
+                    title = stringResource(id = R.string.settings_disable_su),
+                    summary = stringResource(id = R.string.settings_disable_su_summary),
+                    checked = isSuDisabled,
+                    enabled = !isSuDisabled // we can't re-enable su if it's disabled.
+                ) { checked ->
+                    val shouldEnable = !checked
+                    if (Natives.setSuEnabled(shouldEnable)) {
+                        isSuDisabled = !shouldEnable
+                    }
+                }
+            }
+
             val prefs = context.getSharedPreferences("settings", Context.MODE_PRIVATE)
             var checkUpdate by rememberSaveable {
                 mutableStateOf(

manager/app/src/main/res/values-zh-rCN/strings.xml

@@ -133,4 +133,6 @@
     <string name="selected_lkm">选择的 LKM：%s</string>
     <string name="save_log">保存日志</string>
     <string name="log_saved">日志已保存</string>
+    <string name="settings_disable_su">关闭 su 兼容</string>
+    <string name="settings_disable_su_summary">临时禁止任何应用通过 su 命令获取 root 权限（已运行的 root 进程不受影响）</string>
 </resources>

manager/app/src/main/res/values/strings.xml

@@ -135,4 +135,6 @@
     <string name="selected_lkm">Selected LKM: %s</string>
     <string name="save_log">Save logs</string>
     <string name="log_saved">Logs saved</string>
+    <string name="settings_disable_su">Disable su compatibility</string>
+    <string name="settings_disable_su_summary">Temporarily disable any applications from obtaining root privileges via the ⁠su command (existing root processes will not be affected).</string>
 </resources>