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KVM: VMX: Fix host GDT.LIMIT corruption

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commit 3444d7da18 upstream.

vmx does not restore GDT.LIMIT to the host value, instead it sets it to 64KB.
This means host userspace can learn a few bits of host memory.

Fix by reloading GDTR when we load other host state.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Avi Kivity
2010-10-28 16:48:12 -02:00
committed by Greg Kroah-Hartman
parent dbd877e34a
commit ffc109c28a
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/vmx.c
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@@ -130,6 +130,7 @@ static u64 construct_eptp(unsigned long root_hpa);
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
static unsigned long *vmx_io_bitmap_a;
static unsigned long *vmx_io_bitmap_b;
@@ -690,6 +691,7 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx)
save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
load_msrs(vmx->host_msrs, vmx->save_nmsrs);
reload_host_efer(vmx);
load_gdt(&__get_cpu_var(host_gdt));
}
static void vmx_load_host_state(struct vcpu_vmx *vmx)
@@ -1176,6 +1178,8 @@ static void hardware_enable(void *garbage)
asm volatile (ASM_VMX_VMXON_RAX
: : "a"(&phys_addr), "m"(phys_addr)
: "memory", "cc");
store_gdt(&__get_cpu_var(host_gdt));
}
static void vmclear_local_vcpus(void)