Revert "Add option to enable global namespace (#497)"

This reverts commit f81caf75a9.

kernel/ksu.c

@@ -1,6 +1,5 @@
 #include "linux/fs.h"
 #include "linux/module.h"
-#include "linux/moduleparam.h"
 #include "linux/workqueue.h"
 
 #include "allowlist.h"
@@ -10,9 +9,6 @@
 #include "ksu.h"
 #include "uid_observer.h"
 
-int global_namespace_enable;
-module_param(global_namespace_enable, int, S_IRUSR | S_IWUSR);
-
 static struct workqueue_struct *ksu_workqueue;
 
 bool ksu_queue_work(struct work_struct *work)

userspace/ksud/src/ksu.rs

@@ -229,10 +229,7 @@ pub fn root_shell() -> Result<()> {
 
             // switch to global mount namespace
             #[cfg(any(target_os = "linux", target_os = "android"))]
-            let global_namespace_enable =
-                std::fs::read_to_string("/sys/module/ksu/parameters/global_namespace_enable")
-                    .unwrap_or("0".to_string());
-            if global_namespace_enable.trim() == "1" || mount_master {
+            if mount_master {
                 let _ = utils::switch_mnt_ns(1);
                 let _ = utils::unshare_mnt_ns();
             }