KVM: s390: vsie: Fix region 1 ASCE sanity shadow address checks

In case we have a region 1 the following calculation
(31 + ((gmap->asce & _ASCE_TYPE_MASK) >> 2)*11)
results in 64. As shifts beyond the size are undefined the compiler is
free to use instructions like sllg. sllg will only use 6 bits of the
shift value (here 64) resulting in no shift at all. That means that ALL
addresses will be rejected.

The can result in endless loops, e.g. when prefix cannot get mapped.

Fixes: 4be130a08420 ("s390/mm: add shadow gmap support")
Tested-by: Janosch Frank <frankja@linux.ibm.com>
Reported-by: Janosch Frank <frankja@linux.ibm.com>
Cc: <stable@vger.kernel.org> # v4.8+
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20200403153050.20569-2-david@redhat.com
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
[borntraeger@de.ibm.com: fix patch description, remove WARN_ON_ONCE]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 2fbece47ef6fd3d713d714eeaffb2d921fb53091..7e9a6761f25483c1d5aff83c7f9f14fa9e32845d 100644 (file)
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -787,14 +787,18 @@ static void gmap_call_notifier(struct gmap *gmap, unsigned long start,
 static inline unsigned long *gmap_table_walk(struct gmap *gmap,
                                             unsigned long gaddr, int level)
 {
+       const int asce_type = gmap->asce & _ASCE_TYPE_MASK;
        unsigned long *table;
 
        if ((gmap->asce & _ASCE_TYPE_MASK) + 4 < (level * 4))
                return NULL;
        if (gmap_is_shadow(gmap) && gmap->removed)
                return NULL;
-       if (gaddr & (-1UL << (31 + ((gmap->asce & _ASCE_TYPE_MASK) >> 2)*11)))
+
+       if (asce_type != _ASCE_TYPE_REGION1 &&
+           gaddr & (-1UL << (31 + (asce_type >> 2) * 11)))
                return NULL;
+
        table = gmap->table;
        switch (gmap->asce & _ASCE_TYPE_MASK) {
        case _ASCE_TYPE_REGION1: