linux-kernel - [PATCH 0/6] KVM: nVMX: propperly handle enlightened vmptrld failure conditions

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Message-Id: <20200309155216.204752-1-vkuznets@redhat.com>
Date:   Mon,  9 Mar 2020 16:52:10 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Liran Alon <liran.alon@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.com>
Subject: [PATCH 0/6] KVM: nVMX: propperly handle enlightened vmptrld failure conditions

Miaohe Lin noticed that we incorrectly handle enlightened vmptrld failures
in nested_vmx_run(). Trying to handle errors correctly, I fixed
a few things:
- NULL pointer dereference with invalid eVMCS GPAs [PATCH1]
- moved eVMCS mapping after migration to nested_get_vmcs12_pages() from
  nested_sync_vmcs12_to_shadow() [PATCH2]
- added propper nested_vmx_handle_enlightened_vmptrld() error handling
  [PATCH3]
- added selftests for incorrect eVMCS revision id and GPA [PATCHes4-6]

PATCH1 fixes a DoS and thus marked for stable@.

Vitaly Kuznetsov (6):
  KVM: nVMX: avoid NULL pointer dereference with incorrect EVMCS GPAs
  KVM: nVMX: stop abusing need_vmcs12_to_shadow_sync for eVMCS mapping
  KVM: nVMX: properly handle errors in
    nested_vmx_handle_enlightened_vmptrld()
  KVM: selftests: define and use EVMCS_VERSION
  KVM: selftests: test enlightened vmenter with wrong eVMCS version
  KVM: selftests: enlightened VMPTRLD with an incorrect GPA

 arch/x86/kvm/vmx/evmcs.h                      |  7 ++
 arch/x86/kvm/vmx/nested.c                     | 64 +++++++++++++------
 tools/testing/selftests/kvm/include/evmcs.h   |  2 +
 tools/testing/selftests/kvm/lib/x86_64/vmx.c  |  2 +-
 .../testing/selftests/kvm/x86_64/evmcs_test.c | 25 ++++++--
 5 files changed, 72 insertions(+), 28 deletions(-)

-- 
2.24.1