3.19.8-ckt12 -stable review patch. If anyone has any objections, please let me know.
------------------ From: David Hildenbrand <[email protected]> commit b85de33a1a3433487b6a721cfdce25ec8673e622 upstream. Commit 383d0b050106 ("KVM: s390: handle pending local interrupts via bitmap") introduced a possible memory overwrite from user space. User space could pass an invalid emergency signal code (sending VCPU) and therefore exceed the bitmap. Let's take care of this case and check that the id is in the valid range. Reviewed-by: Dominik Dingel <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> Signed-off-by: Christian Borntraeger <[email protected]> [ kamal: backport to 3.19-stable: context ] Signed-off-by: Kamal Mostafa <[email protected]> --- arch/s390/kvm/interrupt.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 07da75c..befe999 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1060,6 +1060,10 @@ static int __inject_sigp_emergency(struct kvm_vcpu *vcpu, trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY, emerg->code, 0, 2); + /* sending vcpu invalid */ + if (kvm_get_vcpu_by_id(vcpu->kvm, emerg.code) == NULL) + return -EINVAL; + set_bit(emerg->code, li->sigp_emerg_pending); set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs); atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
