[PATCH 7.1 66/76] KVM: s390: vsie: zero stale crypto bits

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Borntraeger <borntraeger@linux.ibm.com>

commit 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b upstream.

When shadowing crypto access bits from a format0 apcb (crycb 0 or 1),
the bits 64..255 are unchanged from whatever is in the vsie page in the
crycb and thus in the apcb. This gives a nested guest potential access
to a device no longer available. Zero out the remaining bits.

Fixes: 6b79de4b056e ("KVM: s390: vsie: allow guest FORMAT-1 CRYCB on host FORMAT-2")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260811153738.206885-3-borntraeger@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/s390/kvm/vsie.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -170,6 +170,7 @@ static int setup_apcb10(struct kvm_vcpu
 			    sizeof(struct kvm_s390_apcb0)))
 		return -EFAULT;
 
+	memset(apcb_s, 0, sizeof(*apcb_s));
 	apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0];
 	apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL;
 	apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL;