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KVM: s390: Disallow invalid bits in kvm_valid_regs and kvm_dirty_regs
If unknown bits are set in kvm_valid_regs or kvm_dirty_regs, this clearly indicates that something went wrong in the KVM userspace application. The x86 variant of KVM already contains a check for bad bits, so let's do the same on s390x now, too. Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/lkml/20190904085200.29021-2-thuth@redhat.com/ Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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@ -231,6 +231,12 @@ struct kvm_guest_debug_arch {
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#define KVM_SYNC_GSCB (1UL << 9)
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#define KVM_SYNC_BPBC (1UL << 10)
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#define KVM_SYNC_ETOKEN (1UL << 11)
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#define KVM_SYNC_S390_VALID_FIELDS \
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(KVM_SYNC_PREFIX | KVM_SYNC_GPRS | KVM_SYNC_ACRS | KVM_SYNC_CRS | \
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KVM_SYNC_ARCH0 | KVM_SYNC_PFAULT | KVM_SYNC_VRS | KVM_SYNC_RICCB | \
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KVM_SYNC_FPRS | KVM_SYNC_GSCB | KVM_SYNC_BPBC | KVM_SYNC_ETOKEN)
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/* length and alignment of the sdnx as a power of two */
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#define SDNXC 8
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#define SDNXL (1UL << SDNXC)
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@ -4008,6 +4008,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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if (kvm_run->immediate_exit)
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return -EINTR;
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if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
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kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
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return -EINVAL;
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vcpu_load(vcpu);
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if (guestdbg_exit_pending(vcpu)) {
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