From bfed2d700a0e898e96d57f1ec7ae39cf3a296834 Mon Sep 17 00:00:00 2001
From: Ylarod <me@ylarod.cn>
Date: Mon, 3 Nov 2025 08:31:25 +0800
Subject: [PATCH] add legacy get_version & Full get_version

Co-authored-by: Ylarod <me@ylarod.cn>
Co-authored-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
---
 manager/app/src/main/cpp/jni.c | 11 ++++----
 manager/app/src/main/cpp/ksu.c | 47 +++++++++++++++++++++++++++++++++-
 manager/app/src/main/cpp/ksu.h |  3 +++
 3 files changed, 55 insertions(+), 6 deletions(-)

diff --git a/manager/app/src/main/cpp/jni.c b/manager/app/src/main/cpp/jni.c
index ccae1402..b1c5ab18 100644
--- a/manager/app/src/main/cpp/jni.c
+++ b/manager/app/src/main/cpp/jni.c
@@ -8,11 +8,12 @@
 #include <linux/capability.h>
 
 NativeBridgeNP(getVersion, jint) {
-	uint32_t version = get_version();
-	if (version > INT32_MAX) {
-		LogDebug("Version overflow: %u", version);
-	}
-	return (jint)version;
+    uint32_t version = get_version();
+    if (version > 0) {
+        return (jint)version;
+    }
+    // try legacy method as fallback
+    return legacy_get_version();
 }
 
 // get VERSION FULL
diff --git a/manager/app/src/main/cpp/ksu.c b/manager/app/src/main/cpp/ksu.c
index a1393a06..597fffa7 100644
--- a/manager/app/src/main/cpp/ksu.c
+++ b/manager/app/src/main/cpp/ksu.c
@@ -27,6 +27,34 @@ extern const char* zako_file_verrcidx2str(uint8_t index);
 
 #endif // __aarch64__ || _M_ARM64 || __arm__ || _M_ARM
 
+#define KERNEL_SU_OPTION 0xDEADBEEF
+
+#define CMD_GRANT_ROOT 0
+
+#define CMD_BECOME_MANAGER 1
+#define CMD_GET_VERSION 2
+#define CMD_ALLOW_SU 3
+#define CMD_DENY_SU 4
+#define CMD_GET_SU_LIST 5
+#define CMD_GET_DENY_LIST 6
+#define CMD_CHECK_SAFEMODE 9
+
+#define CMD_GET_APP_PROFILE 10
+#define CMD_SET_APP_PROFILE 11
+
+#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
+
+#define CMD_GET_VERSION_FULL 0xC0FFEE1A
+
+#define CMD_ENABLE_KPM 100
+#define CMD_HOOK_TYPE 101
+#define CMD_DYNAMIC_MANAGER 103
+#define CMD_GET_MANAGERS 104
+#define CMD_ENABLE_UID_SCANNER 105
+
 static int fd = -1;
 
 static inline int scan_driver_fd() {
@@ -79,6 +107,12 @@ static int ksuctl(unsigned long op, void* arg) {
 	return ioctl(fd, op, arg);
 }
 
+static bool ksuctl_prctl(int cmd, void* arg1, void* arg2) {
+    int32_t result = 0;
+    int32_t rtn = prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
+    return result == KERNEL_SU_OPTION && rtn == -1;
+}
+
 static struct ksu_get_info_cmd g_version = {0};
 
 struct ksu_get_info_cmd get_info() {
@@ -186,16 +220,27 @@ bool is_kernel_umount_enabled() {
     return value != 0;
 }
 
+int legacy_get_version() {
+    int32_t version = -1;
+    int32_t flags = 0;
+    ksuctl_prctl(CMD_GET_VERSION, &version, &flags);
+    return version;
+}
+
 void get_full_version(char* buff) {
 	struct ksu_get_full_version_cmd cmd = {0};
 	if (ksuctl(KSU_IOCTL_GET_FULL_VERSION, &cmd) == 0) {
 		strncpy(buff, cmd.version_full, KSU_FULL_VERSION_STRING - 1);
 		buff[KSU_FULL_VERSION_STRING - 1] = '\0';
 	} else {
-		buff[0] = '\0';
+        return legacy_get_full_version(buff);
 	}
 }
 
+void legacy_get_full_version(char* buff) {
+    ksuctl_prctl(CMD_GET_VERSION_FULL, buff, NULL);
+}
+
 bool is_KPM_enable(void)
 {
 	struct ksu_enable_kpm_cmd cmd = {};
diff --git a/manager/app/src/main/cpp/ksu.h b/manager/app/src/main/cpp/ksu.h
index edabfe15..4e692271 100644
--- a/manager/app/src/main/cpp/ksu.h
+++ b/manager/app/src/main/cpp/ksu.h
@@ -14,6 +14,8 @@
 
 uint32_t get_version();
 
+int legacy_get_version(void);
+
 bool uid_should_umount(int uid);
 
 bool is_safe_mode();
@@ -23,6 +25,7 @@ bool is_lkm_mode();
 bool is_manager();
 
 void get_full_version(char* buff);
+void legacy_get_full_version(char* buff);
 
 #define KSU_APP_PROFILE_VER 2
 #define KSU_MAX_PACKAGE_NAME 256