On 05/16/2018 01:32 PM, Cornelia Huck wrote:
> 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,
yes, lets cc stable.
>
> 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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