Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 107/601] KVM: nVMX: Truncate base/index GPR value on address calc in !64-bit | Date | Wed, 12 May 2021 16:43:04 +0200 |
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From: Sean Christopherson <seanjc@google.com>
commit 82277eeed65eed6c6ee5b8f97bd978763eab148f upstream.
Drop bits 63:32 of the base and/or index GPRs when calculating the effective address of a VMX instruction memory operand. Outside of 64-bit mode, memory encodings are strictly limited to E*X and below.
Fixes: 064aea774768 ("KVM: nVMX: Decoding memory operands of VMX instructions") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210422022128.3464144-7-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/x86/kvm/vmx/nested.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4639,9 +4639,9 @@ int get_vmx_mem_address(struct kvm_vcpu else if (addr_size == 0) off = (gva_t)sign_extend64(off, 15); if (base_is_valid) - off += kvm_register_read(vcpu, base_reg); + off += kvm_register_readl(vcpu, base_reg); if (index_is_valid) - off += kvm_register_read(vcpu, index_reg) << scaling; + off += kvm_register_readl(vcpu, index_reg) << scaling; vmx_get_segment(vcpu, &s, seg_reg); /*
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