106 lines
3.3 KiB
Diff
106 lines
3.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Mon, 4 Dec 2017 15:07:31 +0100
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Subject: [PATCH] x86/paravirt: Provide a way to check for hypervisors
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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There is no generic way to test whether a kernel is running on a specific
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hypervisor. But that's required to prevent the upcoming user address space
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separation feature in certain guest modes.
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Make the hypervisor type enum unconditionally available and provide a
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helper function which allows to test for a specific type.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Reviewed-by: Juergen Gross <jgross@suse.com>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Borislav Petkov <bpetkov@suse.de>
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Cc: Brian Gerst <brgerst@gmail.com>
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Cc: Dave Hansen <dave.hansen@intel.com>
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Cc: Dave Hansen <dave.hansen@linux.intel.com>
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Cc: David Laight <David.Laight@aculab.com>
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Cc: Denys Vlasenko <dvlasenk@redhat.com>
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Cc: Eduardo Valentin <eduval@amazon.com>
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Cc: Greg KH <gregkh@linuxfoundation.org>
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Cc: H. Peter Anvin <hpa@zytor.com>
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Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Rik van Riel <riel@redhat.com>
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Cc: Will Deacon <will.deacon@arm.com>
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Cc: aliguori@amazon.com
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Cc: daniel.gruss@iaik.tugraz.at
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Cc: hughd@google.com
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Cc: keescook@google.com
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Link: https://lkml.kernel.org/r/20171204150606.912938129@linutronix.de
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit 79cc74155218316b9a5d28577c7077b2adba8e58)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 9f637574068f1ffdaded1cd1f408917582594b36)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/include/asm/hypervisor.h | 25 +++++++++++++++----------
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1 file changed, 15 insertions(+), 10 deletions(-)
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diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
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index 1b0a5abcd8ae..96aa6b9884dc 100644
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--- a/arch/x86/include/asm/hypervisor.h
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+++ b/arch/x86/include/asm/hypervisor.h
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@@ -20,16 +20,7 @@
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#ifndef _ASM_X86_HYPERVISOR_H
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#define _ASM_X86_HYPERVISOR_H
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-#ifdef CONFIG_HYPERVISOR_GUEST
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-
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-#include <asm/kvm_para.h>
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-#include <asm/x86_init.h>
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-#include <asm/xen/hypervisor.h>
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-
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-/*
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- * x86 hypervisor information
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- */
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-
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+/* x86 hypervisor types */
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enum x86_hypervisor_type {
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X86_HYPER_NATIVE = 0,
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X86_HYPER_VMWARE,
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@@ -39,6 +30,12 @@ enum x86_hypervisor_type {
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X86_HYPER_KVM,
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};
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+#ifdef CONFIG_HYPERVISOR_GUEST
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+
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+#include <asm/kvm_para.h>
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+#include <asm/x86_init.h>
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+#include <asm/xen/hypervisor.h>
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+
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struct hypervisor_x86 {
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/* Hypervisor name */
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const char *name;
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@@ -58,7 +55,15 @@ struct hypervisor_x86 {
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extern enum x86_hypervisor_type x86_hyper_type;
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extern void init_hypervisor_platform(void);
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+static inline bool hypervisor_is_type(enum x86_hypervisor_type type)
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+{
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+ return x86_hyper_type == type;
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+}
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#else
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static inline void init_hypervisor_platform(void) { }
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+static inline bool hypervisor_is_type(enum x86_hypervisor_type type)
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+{
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+ return type == X86_HYPER_NATIVE;
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+}
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#endif /* CONFIG_HYPERVISOR_GUEST */
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#endif /* _ASM_X86_HYPERVISOR_H */
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--
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2.14.2
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