Disable several features in Jellybean

native/jni/daemon/bootstages.cpp

@@ -32,7 +32,6 @@ static vector<string> module_list;
 static bool seperate_vendor;
 
 char *system_block, *vendor_block, *magiskloop;
-int SDK_INT = -1;
 
 static int bind_mount(const char *from, const char *to);
 extern void auto_start_magiskhide();
@@ -53,7 +52,7 @@ extern void auto_start_magiskhide();
 
 class node_entry {
 public:
-	node_entry(const char *, uint8_t status = 0, uint8_t type = 0);
+	explicit node_entry(const char *, uint8_t status = 0, uint8_t type = 0);
 	~node_entry();
 	void create_module_tree(const char *module);
 	void magic_mount();
@@ -437,15 +436,6 @@ static bool magisk_env() {
 	xmkdir(SECURE_DIR "/post-fs-data.d", 0755);
 	xmkdir(SECURE_DIR "/service.d", 0755);
 
-	parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
-		if (strcmp(key, "ro.build.version.sdk") == 0) {
-			LOGI("* Device API level: %s\n", val);
-			SDK_INT = atoi(val);
-			return false;
-		}
-		return true;
-	});
-
 	LOGI("* Mounting mirrors");
 	auto mounts = file_to_vector("/proc/mounts");
 	bool system_as_root = false;
@@ -497,6 +487,13 @@ static bool magisk_env() {
 	LOGI("* Setting up internal busybox");
 	exec_command_sync(MIRRDIR "/bin/busybox", "--install", "-s", BBPATH, nullptr);
 	xsymlink(MIRRDIR "/bin/busybox", BBPATH "/busybox");
+
+	// Disable/remove magiskhide, resetprop, and modules
+	if (SDK_INT < 19) {
+		close(xopen(DISABLEFILE, O_RDONLY | O_CREAT, 0));
+		unlink("/sbin/resetprop");
+		unlink("/sbin/magiskhide");
+	}
 	return true;
 }
 

native/jni/daemon/daemon.cpp

@@ -19,8 +19,11 @@
 #include "daemon.h"
 #include "selinux.h"
 #include "db.h"
+#include "resetprop.h"
 #include "flags.h"
 
+int SDK_INT = -1;
+
 static void get_client_cred(int fd, struct ucred *cred) {
 	socklen_t ucred_length = sizeof(*cred);
 	if(getsockopt(fd, SOL_SOCKET, SO_PEERCRED, cred, &ucred_length))
@@ -44,7 +47,7 @@ static void *request_handler(void *args) {
 		if (credential.uid != 0) {
 			write_int(client, ROOT_REQUIRED);
 			close(client);
-			return NULL;
+			return nullptr;
 		}
 	default:
 		break;
@@ -100,6 +103,16 @@ static void main_daemon() {
 	xdup2(fd, STDIN_FILENO);
 	close(fd);
 
+	// Get API level
+	parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
+		if (strcmp(key, "ro.build.version.sdk") == 0) {
+			LOGI("* Device API level: %s\n", val);
+			SDK_INT = atoi(val);
+			return false;
+		}
+		return true;
+	});
+
 	struct sockaddr_un sun;
 	socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
 	fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
@@ -116,20 +129,20 @@ static void main_daemon() {
 	sigemptyset(&block_set);
 	sigaddset(&block_set, SIGUSR1);
 	sigaddset(&block_set, SIGUSR2);
-	pthread_sigmask(SIG_SETMASK, &block_set, NULL);
+	pthread_sigmask(SIG_SETMASK, &block_set, nullptr);
 
 	// Ignore SIGPIPE
 	struct sigaction act;
 	memset(&act, 0, sizeof(act));
 	act.sa_handler = SIG_IGN;
-	sigaction(SIGPIPE, &act, NULL);
+	sigaction(SIGPIPE, &act, nullptr);
 
 	// Loop forever to listen for requests
 	while(1) {
 		int *client = new int;
-		*client = xaccept4(fd, NULL, NULL, SOCK_CLOEXEC);
+		*client = xaccept4(fd, nullptr, nullptr, SOCK_CLOEXEC);
 		pthread_t thread;
-		xpthread_create(&thread, NULL, request_handler, client);
+		xpthread_create(&thread, nullptr, request_handler, client);
 		// Detach the thread, we will never join it
 		pthread_detach(thread);
 	}

native/jni/magiskhide/hide_utils.cpp

@@ -276,6 +276,9 @@ static void set_hide_config() {
 }
 
 int launch_magiskhide(int client) {
+	if (SDK_INT < 19)
+		goto error;
+
 	if (hide_enabled)
 		return HIDE_IS_ENABLED;