linux

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Alexander Gordeev 2165fd2bae s390/maccess: fix semantics of memcpy_real() and its callers

[ Upstream commit 303fd988ed644c7daa260410f3ac99266573557d ]

There is a confusion with regard to the source address of
memcpy_real() and calling functions. While the declared
type for a source assumes a virtual address, in fact it
always called with physical address of the source.

This confusion led to bugs in copy_oldmem_kernel() and
copy_oldmem_user() functions, where __pa() macro applied
mistakenly to physical addresses. It does not lead to a
real issue, since virtual and physical addresses are
currently the same.

Fix both the bugs and memcpy_real() prototype by making
type of source address consistent to the function name
and the way it actually used.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-08-17 14:24:09 +02:00

cmm.c

mm: remove unneeded includes of <asm/pgalloc.h>

2020-08-07 11:33:26 -07:00

dump_pagetables.c

s390: add kfence region to pagetable dumper

2021-07-30 17:09:02 +02:00

extmem.c

s390/extmem: remove stale -ENOSPC comment and handling

2020-07-03 10:49:16 +02:00

fault.c

Revert "mm/gup: remove try_get_page(), call try_get_compound_head() directly"