From: Vasily Gorbik <gor@xxxxxxxxxxxxx> [ 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@xxxxxxxxxxxxx> Reviewed-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx> Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/s390/kernel/early.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index a651c2bc94ef8..f862cc27fe98f 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -288,6 +288,8 @@ static noinline __init void setup_lowcore_early(void) psw_t psw; psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA; + if (IS_ENABLED(CONFIG_KASAN)) + psw.mask |= PSW_MASK_DAT; psw.addr = (unsigned long) s390_base_ext_handler; S390_lowcore.external_new_psw = psw; psw.addr = (unsigned long) s390_base_pgm_handler; -- 2.25.1
