pve-kernel-lowlatency-qoup/patches/kernel/0009-kvm-nVMX-Enforce-cpl-0-for-VMX-instructions.patch
Stoiko Ivanov e2af2a6161 rebase patches on top of Ubuntu-4.15.0-32.35
(generated with debian/scripts/import-upstream-tag)

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
2018-08-16 13:21:43 +02:00

66 lines
2.4 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Felix Wilhelm <fwilhelm@google.com>
Date: Mon, 11 Jun 2018 09:43:44 +0200
Subject: [PATCH] kvm: nVMX: Enforce cpl=0 for VMX instructions
VMX instructions executed inside a L1 VM will always trigger a VM exit
even when executed with cpl 3. This means we must perform the
privilege check in software.
Fixes: 70f3aac964ae("kvm: nVMX: Remove superfluous VMX instruction fault checks")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Wilhelm <fwilhelm@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
arch/x86/kvm/vmx.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1a5617fc8b6a..5c8bd2d61080 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7575,6 +7575,12 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
return 1;
}
+ /* CPL=0 must be checked manually. */
+ if (vmx_get_cpl(vcpu)) {
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ return 1;
+ }
+
if (vmx->nested.vmxon) {
nested_vmx_failValid(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
return kvm_skip_emulated_instruction(vcpu);
@@ -7634,6 +7640,11 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
*/
static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
{
+ if (vmx_get_cpl(vcpu)) {
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ return 0;
+ }
+
if (!to_vmx(vcpu)->nested.vmxon) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 0;
@@ -7967,7 +7978,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
if (get_vmx_mem_address(vcpu, exit_qualification,
vmx_instruction_info, true, &gva))
return 1;
- /* _system ok, as hardware has verified cpl=0 */
+ /* _system ok, nested_vmx_check_permission has verified cpl=0 */
kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva,
&field_value, (is_long_mode(vcpu) ? 8 : 4), NULL);
}
@@ -8110,7 +8121,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu)
if (get_vmx_mem_address(vcpu, exit_qualification,
vmx_instruction_info, true, &vmcs_gva))
return 1;
- /* ok to use *_system, as hardware has verified cpl=0 */
+ /* *_system ok, nested_vmx_check_permission has verified cpl=0 */
if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva,
(void *)&to_vmx(vcpu)->nested.current_vmptr,
sizeof(u64), &e)) {