x86, kvm: Clear paravirt_enabled on KVM guests for espfix32's benefit

paravirt_enabled has the following effects:

 - Disables the F00F bug workaround warning.  There is no F00F bug
   workaround any more because Linux's standard IDT handling already
   works around the F00F bug, but the warning still exists.  This
   is only cosmetic, and, in any event, there is no such thing as
   KVM on a CPU with the F00F bug.

 - Disables 32-bit APM BIOS detection.  On a KVM paravirt system,
   there should be no APM BIOS anyway.

 - Disables tboot.  I think that the tboot code should check the
   CPUID hypervisor bit directly if it matters.

 - paravirt_enabled disables espfix32.  espfix32 should *not* be
   disabled under KVM paravirt.

The last point is the purpose of this patch.  It fixes a leak of the
high 16 bits of the kernel stack address on 32-bit KVM paravirt
guests.  Fixes CVE-2014-8134.

Cc: stable@vger.kernel.org
Suggested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 8 insertions, 2 deletions

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index f6945bef2cd1..94f643484300 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -283,7 +283,14 @@ NOKPROBE_SYMBOL(do_async_page_fault);
 static void __init paravirt_ops_setup(void)
 {
         pv_info.name = "KVM";
-        pv_info.paravirt_enabled = 1;
+
+        /*
+         * KVM isn't paravirt in the sense of paravirt_enabled.  A KVM
+         * guest kernel works like a bare metal kernel with additional
+         * features, and paravirt_enabled is about features that are
+         * missing.
+         */
+        pv_info.paravirt_enabled = 0;
 
         if (kvm_para_has_feature(KVM_FEATURE_NOP_IO_DELAY))
                 pv_cpu_ops.io_delay = kvm_io_delay;
diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
index 0bf3467d7f30..42caaef897c8 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -261,7 +261,6 @@ void __init kvmclock_init(void)
 #endif
         kvm_get_preset_lpj();
         clocksource_register_hz(&kvm_clock, NSEC_PER_SEC);
-        pv_info.paravirt_enabled = 1;
         pv_info.name = "KVM";
 
         if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE_STABLE_BIT))