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KVM: nVMX: Truncate base/index GPR value on address calc in !64-bit

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commit 82277eeed6 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: 064aea7747 ("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>
This commit is contained in:
Sean Christopherson 2021-04-21 19:21:25 -07:00 • committed by Greg Kroah-Hartman
commit a947f95b6b
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/vmx/nested.c
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@ -4613,9 +4613,9 @@ int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
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);
/*