On Wed, 16 May 2018 10:04:45 +0200
Janosch Frank <frankja@xxxxxxxxxxxxx> wrote:
> On 09.05.2018 16:12, David Hildenbrand wrote:
> > By missing an "L", we might detect some addresses to be <8k,
> > although they are not.
> >
> > e.g. for itdba = 100001fff
> > !(gpa & ~0x1fffU) -> 1
> > !(gpa & ~0x1fffUL) -> 0
> >
> > So we would report a SIE validity intercept although everything is fine.
> >
> > Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> > Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
>
> Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
>
> I'd not necessarily sent it to stable, it's neither security related nor
> a bug that is likely to occur (IMHO) or should have dire consequences.
> But I leave that decision to Christian.
It probably does not hurt to include it in stable, but I don't think
it's particularly important to do so, either. Anyway,
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
>
> > ---
> > arch/s390/kvm/vsie.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
> > index 8961e3970901..969882b54266 100644
> > --- a/arch/s390/kvm/vsie.c
> > +++ b/arch/s390/kvm/vsie.c
> > @@ -578,7 +578,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
> >
> > gpa = READ_ONCE(scb_o->itdba) & ~0xffUL;
> > if (gpa && (scb_s->ecb & ECB_TE)) {
> > - if (!(gpa & ~0x1fffU)) {
> > + if (!(gpa & ~0x1fffUL)) {
> > rc = set_validity_icpt(scb_s, 0x0080U);
> > goto unpin;
> > }
> >
>
>
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