diff options
| author | Thomas Huth <thuth@redhat.com> | 2019-09-04 10:51:59 +0200 |
|---|---|---|
| committer | Janosch Frank <frankja@linux.ibm.com> | 2019-09-04 15:38:05 +0200 |
| commit | 200824f55eef409830a2d1703d6f81542620c2f0 (patch) | |
| tree | b996508dee9c50a0ac149f4eb354a0939559ff38 /arch/s390/kvm/kvm-s390.c | |
| parent | be6f55a60d28fb31864d3aab011cf4e1fc0dba04 (diff) | |
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>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d41c091546b7..a3d4527ac23b 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -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)) { |