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KVM: s390: Disallow invalid bits in kvm_valid_regs and kvm_dirty_regs

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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>
This commit is contained in:
Thomas Huth
2019-09-04 10:51:59 +02:00
committed by Janosch Frank
parent be6f55a60d
commit 200824f55e
2 changed files with 10 additions and 0 deletions
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4
arch/s390/kvm/kvm-s390.c
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@@ -4008,6 +4008,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (kvm_run->immediate_exit)
return -EINTR;
if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
return -EINVAL;
vcpu_load(vcpu);
if (guestdbg_exit_pending(vcpu)) {