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access;
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	pkgsrc-2016Q4:1.1.0.2
	pkgsrc-2016Q4-base:1.1;
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	2016.12.21.15.35.44;	author bouyer;	state Exp;
branches;
next	;
commitid	5zvw6vgCfmRBIRyz;


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-XSA-202,v 1.1 2016/12/21 15:35:44 bouyer Exp $

From: Jan Beulich <jbeulich@@suse.com>
Subject: x86: force EFLAGS.IF on when exiting to PV guests

Guest kernels modifying instructions in the process of being emulated
for another of their vCPU-s may effect EFLAGS.IF to be cleared upon
next exiting to guest context, by converting the being emulated
instruction to CLI (at the right point in time). Prevent any such bad
effects by always forcing EFLAGS.IF on. And to cover hypothetical other
similar issues, also force EFLAGS.{IOPL,NT,VM} to zero.

This is XSA-202.

Signed-off-by: Jan Beulich <jbeulich@@suse.com>

 
--- xen/arch/x86/x86_64/entry.S.orig
+++ xen/arch/x86/x86_64/entry.S
@@@@ -41,28 +41,29 @@@@ restore_all_guest:
         testw $TRAP_syscall,4(%rsp)
         jz    iret_exit_to_guest
 
+        movq  24(%rsp),%r11           # RFLAGS
+        andq  $~(X86_EFLAGS_IOPL|X86_EFLAGS_NT|X86_EFLAGS_VM),%r11
+        orq   $X86_EFLAGS_IF,%r11
+
         /* Don't use SYSRET path if the return address is not canonical. */
         movq  8(%rsp),%rcx
         sarq  $47,%rcx
         incl  %ecx
         cmpl  $1,%ecx
-        ja    .Lforce_iret
+        movq  8(%rsp),%rcx            # RIP
+        ja    iret_exit_to_guest
 
         cmpw  $FLAT_USER_CS32,16(%rsp)# CS
-        movq  8(%rsp),%rcx            # RIP
-        movq  24(%rsp),%r11           # RFLAGS
         movq  32(%rsp),%rsp           # RSP
         je    1f
         sysretq
 1:      sysretl
 
-.Lforce_iret:
-        /* Mimic SYSRET behavior. */
-        movq  8(%rsp),%rcx            # RIP
-        movq  24(%rsp),%r11           # RFLAGS
         ALIGN
 /* No special register assumptions. */
 iret_exit_to_guest:
+        andl  $~(X86_EFLAGS_IOPL|X86_EFLAGS_NT|X86_EFLAGS_VM),24(%rsp)
+        orl   $X86_EFLAGS_IF,24(%rsp)
         addq  $8,%rsp
 .Lft0:  iretq
 
--- xen/arch/x86/x86_64/compat/entry.S.orig	2014-09-02 08:22:57.000000000 +0200
+++ xen/arch/x86/x86_64/compat/entry.S	2016-12-21 13:23:21.000000000 +0100
@@@@ -173,6 +173,10 @@@@
 /* %rbx: struct vcpu, interrupts disabled */
 ENTRY(compat_restore_all_guest)
         ASSERT_INTERRUPTS_DISABLED
+	mov   $~(X86_EFLAGS_IOPL|X86_EFLAGS_NT|X86_EFLAGS_VM),%r11d
+	and   UREGS_eflags(%rsp),%r11d
+	or    $X86_EFLAGS_IF,%r11
+	mov   %r11d,UREGS_eflags(%rsp)
         RESTORE_ALL
         addq  $8,%rsp
 .Lft0:  iretq
@


1.1
log
@Apply patch backported from upstream, fixing XSA-202
Bump PKGREVISION
@
text
@d1 1
a1 1
$NetBSD: patch-XSA-200,v 1.1 2016/12/20 10:22:28 bouyer Exp $
@