kernel: add support for disable sucompat

kernel/core_hook.c

@@ -49,6 +49,10 @@ static bool ksu_module_mounted = false;
 
 extern int handle_sepolicy(unsigned long arg3, void __user *arg4);
 
+static bool ksu_su_compat_enabled = true;
+extern void ksu_sucompat_init();
+extern void ksu_sucompat_exit();
+
 static inline bool is_allow_su()
 {
 	if (is_manager()) {
@@ -278,12 +282,12 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		if (copy_to_user(arg3, &version, sizeof(version))) {
 			pr_err("prctl reply error, cmd: %lu\n", arg2);
 		}
+		u32 version_flags = 0;
 #ifdef MODULE
-		u32 is_lkm = 0x1;
-#else
-		u32 is_lkm = 0x0;
+		version_flags |= 0x1;
 #endif
-		if (arg4 && copy_to_user(arg4, &is_lkm, sizeof(is_lkm))) {
+		if (arg4 &&
+		    copy_to_user(arg4, &version_flags, sizeof(version_flags))) {
 			pr_err("prctl reply error, cmd: %lu\n", arg2);
 		}
 		return 0;
@@ -429,6 +433,39 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
 		return 0;
 	}
 
+	if (arg2 == CMD_IS_SU_ENABLED) {
+		if (copy_to_user(arg3, &ksu_su_compat_enabled,
+				 sizeof(ksu_su_compat_enabled))) {
+			pr_err("copy su compat failed\n");
+			return 0;
+		}
+		if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
+			pr_err("prctl reply error, cmd: %lu\n", arg2);
+		}
+		return 0;
+	}
+
+	if (arg2 == CMD_ENABLE_SU) {
+		bool enabled = (arg3 != 0);
+		if (enabled == ksu_su_compat_enabled) {
+			pr_info("cmd enable su but no need to change.\n");
+			return 0;
+		}
+
+		if (enabled) {
+			ksu_sucompat_init();
+		} else {
+			ksu_sucompat_exit();
+		}
+		ksu_su_compat_enabled = enabled;
+
+		if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
+			pr_err("prctl reply error, cmd: %lu\n", arg2);
+		}
+
+		return 0;
+	}
+
 	return 0;
 }
 

kernel/ksu.h

@@ -21,6 +21,8 @@
 #define CMD_SET_APP_PROFILE 11
 #define CMD_UID_GRANTED_ROOT 12
 #define CMD_UID_SHOULD_UMOUNT 13
+#define CMD_IS_SU_ENABLED 14
+#define CMD_ENABLE_SU 15
 
 #define EVENT_POST_FS_DATA 1
 #define EVENT_BOOT_COMPLETED 2