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locks; strict;
comment	@# @;


1.2
date	2020.08.19.10.39.23;	author bouyer;	state dead;
branches;
next	1.1;
commitid	DGAMglRf0Jde6FkC;

1.1
date	2015.03.10.19.50.16;	author spz;	state Exp;
branches;
next	;
commitid	ayq5pBspp2di56dy;


desc
@@


1.2
log
@Remove xenkernel and xentools packages older than 4.11.
They're not maintained anymore upstream, and don't build on supported NetBSD
releases.
@
text
@$NetBSD: patch-CVE-2015-2151,v 1.1 2015/03/10 19:50:16 spz Exp $

xsa123-4.3-4.2.patch from upstream:

x86emul: fully ignore segment override for register-only operations

For ModRM encoded instructions with register operands we must not
overwrite ea.mem.seg (if a - bogus in that case - segment override was
present) as it aliases with ea.reg.

This is CVE-2015-2151 / XSA-123.

--- xen/arch/x86/x86_emulate/x86_emulate.c.orig	2015-03-10 19:18:09.000000000 +0000
+++ xen/arch/x86/x86_emulate/x86_emulate.c
@@@@ -1640,7 +1640,7 @@@@ x86_emulate(
         }
     }
 
-    if ( override_seg != -1 )
+    if ( override_seg != -1 && ea.type == OP_MEM )
         ea.mem.seg = override_seg;
 
     /* Decode and fetch the source operand: register, memory or immediate. */
@


1.1
log
@xsa123-4.3-4.2.patch from upstream:
x86emul: fully ignore segment override for register-only operations

For ModRM encoded instructions with register operands we must not
overwrite ea.mem.seg (if a - bogus in that case - segment override was
present) as it aliases with ea.reg.

This is CVE-2015-2151 / XSA-123.
@
text
@d1 1
a1 1
$NetBSD$
@