kernel: remove become_manager and minor refactors

kernel/Makefile

@@ -2,8 +2,7 @@ kernelsu-objs := ksu.o
 kernelsu-objs += allowlist.o
 kernelsu-objs += apk_sign.o
 kernelsu-objs += sucompat.o
-kernelsu-objs += uid_observer.o
-kernelsu-objs += manager.o
+kernelsu-objs += throne_tracker.o
 kernelsu-objs += core_hook.o
 kernelsu-objs += ksud.o
 kernelsu-objs += embed_ksud.o

kernel/core_hook.c

@@ -37,7 +37,8 @@
 #include "linux/vmalloc.h"
 #include "manager.h"
 #include "selinux/selinux.h"
-#include "uid_observer.h"
+#include "throne_tracker.h"
+#include "throne_tracker.h"
 #include "kernel_compat.h"
 
 static bool ksu_module_mounted = false;
@@ -199,7 +200,7 @@ 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);
 
-	update_uid();
+	track_throne();
 
 	return 0;
 }

kernel/ksu.c

@@ -9,7 +9,7 @@
 #include "core_hook.h"
 #include "klog.h" // IWYU pragma: keep
 #include "ksu.h"
-#include "uid_observer.h"
+#include "throne_tracker.h"
 
 static struct workqueue_struct *ksu_workqueue;
 
@@ -53,7 +53,7 @@ int __init kernelsu_init(void)
 
 	ksu_allowlist_init();
 
-	ksu_uid_observer_init();
+	ksu_throne_tracker_init();
 
 #ifdef CONFIG_KPROBES
 	ksu_enable_sucompat();
@@ -74,7 +74,7 @@ void kernelsu_exit(void)
 {
 	ksu_allowlist_exit();
 
-	ksu_uid_observer_exit();
+	ksu_throne_tracker_exit();
 
 	destroy_workqueue(ksu_workqueue);
 

kernel/manager.h

@@ -33,6 +33,4 @@ static inline void ksu_invalidate_manager_uid()
 	ksu_manager_uid = KSU_INVALID_UID;
 }
 
-bool become_manager(char *pkg);
-
 #endif

kernel/uid_observer.c → kernel/throne_tracker.c

@@ -11,9 +11,11 @@
 #include "klog.h" // IWYU pragma: keep
 #include "ksu.h"
 #include "manager.h"
-#include "uid_observer.h"
+#include "throne_tracker.h"
 #include "kernel_compat.h"
 
+uid_t ksu_manager_uid = KSU_INVALID_UID;
+
 #define SYSTEM_PACKAGES_LIST_PATH "/data/system/packages.list"
 static struct work_struct ksu_update_uid_work;
 
@@ -71,6 +73,14 @@ static void crown_manager(const char *apk, struct list_head *uid_data)
 
 	pr_info("manager pkg: %s\n", pkg);
 
+#ifdef KSU_MANAGER_PACKAGE
+	// pkg is `/<real package>`
+	if (strncmp(pkg, KSU_MANAGER_PACKAGE, sizeof(KSU_MANAGER_PACKAGE))) {
+		pr_info("manager package is inconsistent with kernel build: %s\n",
+			KSU_MANAGER_PACKAGE);
+		return;
+	}
+#endif
 	struct list_head *list = (struct list_head *)uid_data;
 	struct uid_data *np;
 
@@ -292,18 +302,18 @@ static void do_update_uid(struct work_struct *work)
 	filp_close(fp, 0);
 }
 
-void update_uid()
+void track_throne()
 {
 	ksu_queue_work(&ksu_update_uid_work);
 }
 
-int ksu_uid_observer_init()
+int ksu_throne_tracker_init()
 {
 	INIT_WORK(&ksu_update_uid_work, do_update_uid);
 	return 0;
 }
 
-int ksu_uid_observer_exit()
+int ksu_throne_tracker_exit()
 {
 	return 0;
 }

kernel/throne_tracker.h

@@ -0,0 +1,10 @@
+#ifndef __KSU_H_UID_OBSERVER
+#define __KSU_H_UID_OBSERVER
+
+int ksu_throne_tracker_init();
+
+int ksu_throne_tracker_exit();
+
+void track_throne();
+
+#endif