KVM: x86: Protect MSR-based index computations in pmu.h from Spectre-v1/L1TF attacks

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This fixes a Spectre-v1/L1TF vulnerability in the get_gp_pmc() and
get_fixed_pmc() functions.
They both contain index computations based on the (attacker-controlled)
MSR number.

Fixes: 25462f7f52 ("KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch")

Signed-off-by: Nick Finco <nifi@google.com>
Signed-off-by: Marios Pomonis <pomonis@google.com>
Reviewed-by: Andrew Honig <ahonig@google.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Marios Pomonis 2019-12-11 12:47:48 -08:00 • committed by Paolo Bonzini

parent 25a5edea71

commit 13c5183a4e

1 changed files with 14 additions and 4 deletions

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arch/x86/kvm/pmu.h

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