kernel: Use the prctl command to provide switches for scanning functionality in user space

kernel/core_hook.c

@@ -57,6 +57,8 @@
 #include "kpm/kpm.h"
 #endif
 
+bool ksu_uid_scanner_enabled = false;
+
 #ifdef CONFIG_KSU_SUSFS
 bool susfs_is_allow_su(void)
 {
@@ -315,10 +317,11 @@ int ksu_handle_rename(struct dentry *old_dentry, struct dentry *new_dentry)
 	pr_info("renameat: %s -> %s, new path: %s\n", old_dentry->d_iname,
 		new_dentry->d_iname, buf);
 
+	if (ksu_uid_scanner_enabled) {
+		ksu_request_userspace_scan();
+	}
+
 	track_throne();
-	
-	// Also request userspace scan for next time
-	ksu_request_userspace_scan();
 
 	return 0;
 }
@@ -350,6 +353,19 @@ static inline void nuke_ext4_sysfs(void)
 }
 #endif
 
+static void init_uid_scanner(void)
+{
+	ksu_uid_init();
+	do_load_throne_state(NULL);
+	
+	if (ksu_uid_scanner_enabled) {
+		int ret = ksu_throne_comm_init();
+		if (ret != 0) {
+			pr_err("Failed to initialize throne communication: %d\n", ret);
+		}
+	}
+}
+
 int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		     unsigned long arg4, unsigned long arg5)
 {
@@ -499,8 +515,8 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 				post_fs_data_lock = true;
 				pr_info("post-fs-data triggered\n");
 				on_post_fs_data();
-				// Initialize throne communication
-				ksu_throne_comm_init();
+				// Initialize UID scanner if enabled
+				init_uid_scanner();
 				// Initializing Dynamic Signatures
         		ksu_dynamic_manager_init();
         		pr_info("Dynamic sign config loaded during post-fs-data\n");
@@ -1103,6 +1119,58 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		return 0;
 	}
 
+	// UID Scanner control command
+	if (arg2 == CMD_ENABLE_UID_SCANNER) {
+		if (arg3 == 0) {
+			// Get current status
+			bool status = ksu_uid_scanner_enabled;
+			if (copy_to_user((void __user *)arg4, &status, sizeof(status))) {
+				pr_err("uid_scanner: copy status failed\n");
+				return 0;
+			}
+		} else if (arg3 == 1) {
+			// Enable/Disable toggle
+			bool enabled = (arg4 != 0);
+			
+			if (enabled == ksu_uid_scanner_enabled) {
+				pr_info("uid_scanner: no need to change, already %s\n", 
+					enabled ? "enabled" : "disabled");
+				if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
+					pr_err("uid_scanner: prctl reply error\n");
+				}
+				return 0;
+			}
+
+			if (enabled) {
+				// Enable UID scanner
+				int ret = ksu_throne_comm_init();
+				if (ret != 0) {
+					pr_err("uid_scanner: failed to initialize: %d\n", ret);
+					return 0;
+				}
+				pr_info("uid_scanner: enabled\n");
+			} else {
+				// Disable UID scanner
+				ksu_throne_comm_exit();
+				pr_info("uid_scanner: disabled\n");
+			}
+			
+			ksu_uid_scanner_enabled = enabled;
+			ksu_throne_comm_save_state();
+		} else if (arg3 == 2) {
+			// Clear environment (force exit)
+			ksu_throne_comm_exit();
+			ksu_uid_scanner_enabled = false;
+			ksu_throne_comm_save_state();
+			pr_info("uid_scanner: environment cleared\n");
+		}
+
+		if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
+			pr_err("uid_scanner: prctl reply error\n");
+		}
+		return 0;
+	}
+
 	return 0;
 }
 
@@ -1699,6 +1767,7 @@ void __init ksu_core_init(void)
 
 void ksu_core_exit(void)
 {
+	ksu_uid_exit();
 	ksu_throne_comm_exit();
 	
 #ifdef CONFIG_KSU_KPROBES_HOOK

kernel/ksu.h

@@ -31,6 +31,7 @@
 #define CMD_GET_SUSFS_FEATURE_STATUS 102
 #define CMD_DYNAMIC_MANAGER 103
 #define CMD_GET_MANAGERS 104
+#define CMD_ENABLE_UID_SCANNER 105
 
 #define EVENT_POST_FS_DATA 1
 #define EVENT_BOOT_COMPLETED 2

kernel/throne_comm.c

@@ -7,12 +7,18 @@
 
 #include "klog.h"
 #include "throne_comm.h"
+#include "kernel_compat.h"
 
 #define PROC_UID_SCANNER "ksu_uid_scanner"
+#define UID_SCANNER_STATE_FILE "/data/adb/ksu/.uid_scanner"
 
 static struct proc_dir_entry *proc_entry = NULL;
 static struct workqueue_struct *scanner_wq = NULL;
 static struct work_struct scan_work;
+static struct work_struct ksu_state_save_work;
+static struct work_struct ksu_state_load_work;
+
+extern bool ksu_uid_scanner_enabled;
 
 // Signal userspace to rescan
 static bool need_rescan = false;
@@ -38,6 +44,67 @@ void ksu_handle_userspace_update(void)
 	pr_info("userspace uid list updated\n");
 }
 
+static void do_save_throne_state(struct work_struct *work)
+{
+	struct file *fp;
+	char state_char = ksu_uid_scanner_enabled ? '1' : '0';
+	loff_t off = 0;
+
+	fp = ksu_filp_open_compat(UID_SCANNER_STATE_FILE, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+	if (IS_ERR(fp)) {
+		pr_err("save_throne_state create file failed: %ld\n", PTR_ERR(fp));
+		return;
+	}
+
+	if (ksu_kernel_write_compat(fp, &state_char, sizeof(state_char), &off) != sizeof(state_char)) {
+		pr_err("save_throne_state write failed\n");
+		goto exit;
+	}
+
+	pr_info("throne state saved: %s\n", ksu_uid_scanner_enabled ? "enabled" : "disabled");
+
+exit:
+	filp_close(fp, 0);
+}
+
+void do_load_throne_state(struct work_struct *work)
+{
+	struct file *fp;
+	char state_char;
+	loff_t off = 0;
+	ssize_t ret;
+
+	fp = ksu_filp_open_compat(UID_SCANNER_STATE_FILE, O_RDONLY, 0);
+	if (IS_ERR(fp)) {
+		pr_info("throne state file not found, using default: disabled\n");
+		ksu_uid_scanner_enabled = false;
+		return;
+	}
+
+	ret = ksu_kernel_read_compat(fp, &state_char, sizeof(state_char), &off);
+	if (ret != sizeof(state_char)) {
+		pr_err("load_throne_state read err: %zd\n", ret);
+		ksu_uid_scanner_enabled = false;
+		goto exit;
+	}
+
+	ksu_uid_scanner_enabled = (state_char == '1');
+	pr_info("throne state loaded: %s\n", ksu_uid_scanner_enabled ? "enabled" : "disabled");
+
+exit:
+	filp_close(fp, 0);
+}
+
+bool ksu_throne_comm_load_state(void)
+{
+	return ksu_queue_work(&ksu_state_load_work);
+}
+
+void ksu_throne_comm_save_state(void)
+{
+	ksu_queue_work(&ksu_state_save_work);
+}
+
 static int uid_scanner_show(struct seq_file *m, void *v)
 {
 	if (need_rescan) {
@@ -134,3 +201,15 @@ void ksu_throne_comm_exit(void)
 	
 	pr_info("throne communication cleaned up\n");
 }
+
+int ksu_uid_init(void)
+{
+	INIT_WORK(&ksu_state_save_work, do_save_throne_state);
+	INIT_WORK(&ksu_state_load_work, do_load_throne_state);
+	return 0;
+}
+
+void ksu_uid_exit(void)
+{
+	do_save_throne_state(NULL);
+}

kernel/throne_comm.h

@@ -9,4 +9,14 @@ int ksu_throne_comm_init(void);
 
 void ksu_throne_comm_exit(void);
 
+int ksu_uid_init(void);
+
+void ksu_uid_exit(void);
+
+bool ksu_throne_comm_load_state(void);
+
+void ksu_throne_comm_save_state(void);
+
+void do_load_throne_state(struct work_struct *work);
+
 #endif

kernel/throne_tracker.c

@@ -586,15 +586,21 @@ static bool is_uid_exist(uid_t uid, char *package, void *data)
 	return exist;
 }
 
+extern bool ksu_uid_scanner_enabled;
+
 void track_throne(void)
 {
 	struct list_head uid_list;
 	INIT_LIST_HEAD(&uid_list);
 
-	pr_info("track_throne triggered, attempting whitelist read\n");
-	
-	// Try read whitelist first
-	int ret = read_uid_whitelist(&uid_list);
+	int ret;
+
+	if (ksu_uid_scanner_enabled) {
+		// Try read whitelist first
+		ret = read_uid_whitelist(&uid_list);
+	} else {
+		ret = -1;
+	}
 	
 	if (ret < 0) {
 		pr_info("whitelist read failed (%d), request userspace scan, falling back to user_de \n", ret);