linux/arch/s390
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 25591b0703 ("[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
..
appldata
boot
configs s390: update defconfig 2017-06-08 15:53:48 +02:00
crypto s390/crypto: fix aes/paes Kconfig dependeny 2017-06-12 16:25:58 +02:00
hypfs
include s390/mm: make pmdp_invalidate() do invalidation only 2017-09-19 08:36:19 +02:00
kernel s390/perf: fix bug when creating per-thread event 2017-09-13 16:34:23 +02:00
kvm First batch of KVM changes for 4.14 2017-09-08 15:18:36 -07:00
lib s390/uaccess: avoid mvcos jump label 2017-08-29 16:29:10 +02:00
mm s390/mm: fix write access check in gup_huge_pmd() 2017-09-19 08:36:20 +02:00
net bpf, s390x: implement jiting of BPF_J{LT, LE, SLT, SLE} 2017-08-09 16:53:57 -07:00
numa
oprofile
pci IOMMU Updates for Linux v4.14 2017-09-09 15:03:24 -07:00
tools First batch of KVM changes for 4.14 2017-09-08 15:18:36 -07:00
defconfig s390: update defconfig 2017-06-08 15:53:48 +02:00
Kbuild s390/crypto: Provide s390 specific arch random functionality. 2017-04-26 13:41:35 +02:00
Kconfig s390: add support for IBM z14 machines 2017-07-26 08:25:15 +02:00
Kconfig.debug
Makefile s390: add support for IBM z14 machines 2017-07-26 08:25:15 +02:00