From f144ba8d8b1a35d9629215beb1fbcafa7fab63d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?George=20Bi=C8=99oc?= <george.bisoc@reactos.org>
Date: Sun, 20 Jun 2021 15:49:55 +0200
Subject: [PATCH] [CSRSS] Do not give IOPL to the Client/Server native process
 if ran on a AMD64 system

ProcessUserModeIOPL is strictly implemented for 32-bit architecture so it doesn't make any sense for CSRSS to gather user mode I/O privilege when that won't work anyway.
---
 subsystems/win32/csrss/csrss.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/subsystems/win32/csrss/csrss.c b/subsystems/win32/csrss/csrss.c
index 10f916ccf3c..7862d8f7a4d 100644
--- a/subsystems/win32/csrss/csrss.c
+++ b/subsystems/win32/csrss/csrss.c
@@ -52,6 +52,7 @@ _main(int argc,
                             &BasePriority,
                             sizeof(KPRIORITY));
 
+#if defined (_X86_)
     /* Give us IOPL so that we can access the VGA registers */
     Status = NtSetInformationProcess(NtCurrentProcess(),
                                      ProcessUserModeIOPL,
@@ -70,6 +71,7 @@ _main(int argc,
                                   &Response);
 #endif
     }
+#endif
 
     /* Initialize CSR through CSRSRV */
     Status = CsrServerInitialization(argc, argv);