tree 992691f77f530140316a023e7352a35f67429517
parent 14a7ef71fbd0cc1e19da6fcd0521217712487fcf
author Vasily Gorbik <gor@linux.ibm.com> 1592399149 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1594880242 +0200

s390/kasan: fix early pgm check handler execution

[ Upstream commit 998f5bbe3dbdab81c1cfb1aef7c3892f5d24f6c7 ]

Currently if early_pgm_check_handler is called it ends up in pgm check
loop. The problem is that early_pgm_check_handler is instrumented by
KASAN but executed without DAT flag enabled which leads to addressing
exception when KASAN checks try to access shadow memory.

Fix that by executing early handlers with DAT flag on under KASAN as
expected.

Reported-and-tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>