From a18d8020641d28fe40b43e9ff20652a8a6a6a4d0 Mon Sep 17 00:00:00 2001
From: Doczom <Doczom@kolibrios.org>
Date: Sun, 9 May 2021 09:14:43 +0000
Subject: [PATCH] fixed vulnerability (reading kernel memory from userspace) in
 sysfn 54.2

git-svn-id: svn://kolibrios.org@8711 a494cfbc-eb01-0410-851d-a64ba20cac60
---
 kernel/trunk/core/clipboard.inc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/trunk/core/clipboard.inc b/kernel/trunk/core/clipboard.inc
index 1d023d5528..99f1fa4aca 100644
--- a/kernel/trunk/core/clipboard.inc
+++ b/kernel/trunk/core/clipboard.inc
@@ -49,6 +49,15 @@ align 4
 .2:
         dec     ebx  ; 2 - Write the data to the clipboard
         jnz     .3
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+        stdcall is_region_userspace, edx, ecx
+        jnz     @f
+        mov     eax, -1
+        jmp     .exit_1
+@@:
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
 ; check the lock
         mov     ebx, clipboard_write_lock
         xor     eax, eax