Gerald Schaefer ba385c0594 s390/mm: fix write access check in gup_huge_pmd() ...

The check for the _SEGMENT_ENTRY_PROTECT bit in gup_huge_pmd() is the
wrong way around. It must not be set for write==1, and not be checked for
write==0. Fix this similar to how it was fixed for ptes long time ago in
commit 25591b070336 ("[S390] fix get_user_pages_fast").

One impact of this bug would be unnecessarily using the gup slow path for
write==0 on r/w mappings. A potentially more severe impact would be that
gup_huge_pmd() will succeed for write==1 on r/o mappings.

Cc: <stable@vger.kernel.org>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2017-09-19 08:36:20 +02:00

..

cmm.c

s390: mm: Audit and remove any unnecessary uses of module.h

2017-02-17 07:40:35 +01:00

dump_pagetables.c

s390/mm: implement 5 level pages tables

2017-06-12 16:25:54 +02:00

extmem.c

s390: mm: Audit and remove any unnecessary uses of module.h

2017-02-17 07:40:35 +01:00

fault.c

s390/mm: use new mm defines instead of magic values

2017-07-26 08:25:09 +02:00

gmap.c

s390/mm: use a single lock for the fields in mm_context_t

2017-09-06 09:24:43 +02:00

gup.c

s390/mm: fix write access check in gup_huge_pmd()

2017-09-19 08:36:20 +02:00

hugetlbpage.c

mm/hugetlb: add size parameter to huge_pte_offset()

2017-07-06 16:24:34 -07:00

init.c

s390/mm: prevent memory offline for memory blocks with cma areas

2017-08-09 09:09:28 -04:00

maccess.c

s390/maccess: reduce stnsm instructions

2016-02-17 09:05:04 +01:00

Makefile

s390/extable: use generic search and sort routines

2016-03-22 15:36:02 -07:00

mem_detect.c

s390: mm: Audit and remove any unnecessary uses of module.h

2017-02-17 07:40:35 +01:00

mmap.c

s390/mm: fix BUG_ON in crst_table_upgrade

2017-08-31 14:03:21 +02:00

page-states.c

s390/mm: tag normal pages vs pages used in page tables

2017-07-25 06:55:28 +02:00

pageattr.c

s390/mm,vmem: simplify region and segment table allocation code

2017-07-26 08:25:12 +02:00

pgalloc.c

s390/mm: use a single lock for the fields in mm_context_t

2017-09-06 09:24:43 +02:00

pgtable.c

KVM: s390: Fixes and features for 4.14

2017-09-07 16:46:46 +02:00

vmem.c

s390/mm,vmem: simplify region and segment table allocation code

2017-07-26 08:25:12 +02:00