From: Janis Schoetterl-Glausch scgl@linux.ibm.com
commit 2c212e1baedcd782b2535a3f86bc491977677c0e upstream.
Refuse SIDA memops on guests which are not protected. For normal guests, the secure instruction data address designation, which determines the location we access, is not under control of KVM.
Fixes: 19e122776886 (KVM: S390: protvirt: Introduce instruction data area bounce buffer) Signed-off-by: Janis Schoetterl-Glausch scgl@linux.ibm.com Cc: stable@vger.kernel.org Signed-off-by: Christian Borntraeger borntraeger@linux.ibm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/s390/kvm/kvm-s390.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -4654,6 +4654,8 @@ static long kvm_s390_guest_sida_op(struc return -EINVAL; if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block)) return -E2BIG; + if (!kvm_s390_pv_cpu_is_protected(vcpu)) + return -EINVAL;
switch (mop->op) { case KVM_S390_MEMOP_SIDA_READ: