David Hildenbrand a1d032a495 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: 4be130a084 ("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>		2020-04-07 13:12:18 +02:00
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cmm.c	s390/cmm: fix information leak in cmm_timeout_handler()	2019-10-31 17:26:48 +01:00
dump_pagetables.c	s390/mm: fix dump_pagetables top level page table walking	2019-08-06 13:58:34 +02:00
extmem.c	s390/extmem: use refcount_t for refcount	2019-08-21 12:41:43 +02:00
fault.c	ARM:	2020-04-02 15:13:15 -07:00
gmap.c	KVM: s390: vsie: Fix region 1 ASCE sanity shadow address checks	2020-04-07 13:12:18 +02:00
hugetlbpage.c	s390/mm: fix dynamic pagetable upgrade for hugetlbfs	2020-01-30 13:07:54 +01:00
init.c	mm/memory_hotplug: shrink zones when offlining memory	2020-01-04 13:55:08 -08:00
kasan_init.c	s390/kasan: add KASAN_VMALLOC support	2019-12-11 19:56:59 +01:00
maccess.c	s390: disable preemption when switching to nodat stack with CALL_ON_STACK	2019-11-30 10:52:45 +01:00
Makefile	s390/mm: convert to the generic get_user_pages_fast code	2019-04-23 16:30:04 +02:00
mmap.c	s390/mm: mmap base does not depend on ADDR_NO_RANDOMIZE personality	2019-06-04 15:03:53 +02:00
page-states.c	s390/cmma: reuse kstrtobool for option value parsing	2019-08-26 12:51:18 +02:00
pageattr.c	s390/mm: Clear huge page storage keys on enable_skey	2018-07-30 11:20:18 +01:00
pgalloc.c	mm: treewide: clarify pgtable_page_{ctor,dtor}() naming	2019-09-26 10:10:44 -07:00
pgtable.c	s390/mm: silence compiler warning when compiling without CONFIG_PGSTE	2019-04-10 17:48:28 +02:00
vmem.c	s390/kernel: introduce .dma sections	2019-04-29 10:47:10 +02:00