KVM: nVMX: Ignore segment base for VMX memory operand when segment not FS or GS

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As reported by Maxime at
https://bugzilla.kernel.org/show_bug.cgi?id=204175:

In vmx/nested.c::get_vmx_mem_address(), when the guest runs in long mode,
the base address of the memory operand is computed with a simple:
    *ret = s.base + off;

This is incorrect, the base applies only to FS and GS, not to the others.
Because of that, if the guest uses a VMX instruction based on DS and has
a DS.base that is non-zero, KVM wrongfully adds the base to the
resulting address.

Reported-by: Maxime Villard <max@m00nbsd.net>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Liran Alon 2019-07-15 18:47:44 +03:00 • committed by Paolo Bonzini

parent 0d88800d54

commit 6694e48012

1 changed files with 4 additions and 1 deletions

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arch/x86/kvm/vmx/nested.c

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