From 61e3a9bcf29f765d52df955fab844ff53d714e05 Mon Sep 17 00:00:00 2001
From: rsuntk <90097027+rsuntk@users.noreply.github.com>
Date: Sun, 25 May 2025 01:43:19 +0000
Subject: [PATCH] kernel: fix ksu_sys_umount compatibility

* Some people reports about undefined reference to `sys_umount`
* Since ksys_umount exist on Linux 4.17-rc1, then we gonna use that one.

Rev 2: Use correct int instead of long for ksys_umount

Signed-off-by: rsuntk <90097027+rsuntk@users.noreply.github.com>
---
 kernel/core_hook.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index ba528a77..97e3e560 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -993,7 +993,11 @@ static int ksu_sys_umount(const char *mnt, int flags)
 
 	mm_segment_t old_fs = get_fs();
 	set_fs(KERNEL_DS);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 17, 0)
+	int ret = ksys_umount(usermnt, flags);
+#else
 	long ret = sys_umount(usermnt, flags); // cuz asmlinkage long sys##name
+#endif
 	set_fs(old_fs);
 	pr_info("%s: path: %s code: %d \n", __func__, usermnt, ret);
 }