linux-kernel - [PATCH] kmod in usermode (module loader in Ring 3)

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Message-ID: <CABQQNFEWUUF5GDEP91-KTF3bJ9s--GfhdmTqvk7AbGPS7Dh80w@mail.gmail.com>
Date:	Sat, 25 Apr 2015 18:01:32 -0400
From:	Christopher Sacchi <christophersacchi@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] kmod in usermode (module loader in Ring 3)

This is an experimental patch to put kmod in Ring 3, rather than Ring 0.
Here it is, below the dashed lines:

---------------------------------------------------------------------------------------------------------------------------

Signed-off-by: Christopher P. Sacchi <christophersacchi@...il.com>

--- kmod.old    2015-04-12 18:12:50.000000000 -0400
+++ kmod.c    2015-04-25 17:52:47.629844677 -0400
@@ -43,6 +43,14 @@

 #include <trace/events/module.h>

+#ifdef CONFIG_X64
+asm("sysret");
+#endif
+
+#ifndef CONFIG_X64
+asm("sysexit");
+#endif
+
 extern int max_threads;

 static struct workqueue_struct *khelper_wq;
@@ -692,3 +700,11 @@ void __init usermodehelper_init(void)
     khelper_wq = create_singlethread_workqueue("khelper");
     BUG_ON(!khelper_wq);
 }
+
+#ifdef CONFIG_X64
+asm("syscall");
+#endif
+
+#ifndef CONFIG_X64
+asm("sysenter");
+#endif

---------------------------------------------------------------------------------------------------------------------------

Regards,
Christopher P. Sacchi
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