Attachment 595772 Details for Bug 837032 – Fix #GPF injection into compat guests in vm86 code

[patch] Fix #GPF injection into compat guests in vm86 code

0002-Fix-GPF-injection-into-compat-guests-in-vm86-code.patch (text/plain), 1.36 KB, created by Igor Mammedov on 2012-07-02 16:47:57 UTC

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Creator: Igor Mammedov

Created: 2012-07-02 16:47:57 UTC

Size: 1.36 KB

patch

obsolete

>From 1e3c80b6b94b52a64435aa9960e03f4fb6274b5a Mon Sep 17 00:00:00 2001
>From: Igor Mammedov <imammedo@redhat.com>
>Date: Fri, 29 Jun 2012 15:02:26 +0200
>Subject: [RHEL5.9 Xen 2/2] Fix #GPF injection into compat guests in vm86 code
>
>Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=837032
>Upstream xen-unstable.hg, cs: 21700
>Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=4567083
>
>------------
>not to let the guest disable interrupts in the real EFLAGS.
>
>Signed-off-by: Ian Campbell <ian.campbell@citrix.com
>------------
>Signed-off-by: Igor Mammedov <imammedo@redhat.com>
>---
> arch/x86/x86_64/compat/traps.c |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
>diff --git a/arch/x86/x86_64/compat/traps.c b/arch/x86/x86_64/compat/traps.c
>index df1e512..af7f48b 100644
>--- a/arch/x86/x86_64/compat/traps.c
>+++ b/arch/x86/x86_64/compat/traps.c
>@@ -100,8 +100,8 @@ unsigned int compat_iret(void)
>         ti = &current->arch.guest_context.trap_ctxt[13];
>         if ( TI_GET_IF(ti) )
>             eflags &= ~X86_EFLAGS_IF;
>-        regs->_eflags = eflags & ~(X86_EFLAGS_VM|X86_EFLAGS_RF|
>-                                   X86_EFLAGS_NT|X86_EFLAGS_TF);
>+        regs->_eflags &= ~(X86_EFLAGS_VM|X86_EFLAGS_RF|
>+                           X86_EFLAGS_NT|X86_EFLAGS_TF);
> 
>         if ( unlikely(__put_user(0, (u32 *)regs->rsp)) )
>             goto exit_and_crash;
>-- 
>1.7.5
>

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Attachments on bug 837032: 595771 | 595772