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s390: vfio-ap: tighten the NIB validity check

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The NIB is architecturally invalid if the address designates a
storage location that is not installed or if it is zero.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reported-by: Janosch Frank <frankja@linux.ibm.com>
Fixes: ec89b55e3b ("s390: ap: implement PAPQ AQIC interception in kernel")
Reviewed-by: Tony Krowiak <akrowiak@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Halil Pasic 2023-02-09 00:00:22 +01:00 committed by Heiko Carstens
parent 2f09c2ea6c
commit a64a6d2387
1 changed files with 2 additions and 0 deletions
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2
drivers/s390/crypto/vfio_ap_ops.c
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@ -352,6 +352,8 @@ static int vfio_ap_validate_nib(struct kvm_vcpu *vcpu, dma_addr_t *nib)
{
*nib = vcpu->run->s.regs.gprs[2];
if (!*nib)
return -EINVAL;
if (kvm_is_error_hva(gfn_to_hva(vcpu->kvm, *nib >> PAGE_SHIFT)))
return -EINVAL;