From: Thomas Weißschuh <linux@xxxxxxxxxxxxxx> [ Upstream commit 19ae40f572a9ce1ade9954990af709a03fd37010 ] Pointer arguments passed to ioctls need to pass through compat_ptr() to work correctly on s390; as explained in Documentation/driver-api/ioctl.rst. Detect compat mode at runtime and call compat_ptr() for those commands which do take pointer arguments. Suggested-by: Arnd Bergmann <arnd@xxxxxxxx> Link: https://lore.kernel.org/lkml/1ba5d3a4-7931-455b-a3ce-85a968a7cb10@xxxxxxxxxxxxxxxx/ Fixes: d94ba80ebbea ("ptp: Added a brand new class driver for ptp clocks.") Signed-off-by: Thomas Weißschuh <linux@xxxxxxxxxxxxxx> Reviewed-by: Cyrill Gorcunov <gorcunov@xxxxxxxxx> Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx> Acked-by: Richard Cochran <richardcochran@xxxxxxxxx> Link: https://patch.msgid.link/20250125-posix-clock-compat_ioctl-v2-1-11c865c500eb@xxxxxxxxxxxxxx Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/ptp/ptp_chardev.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -4,6 +4,7 @@ * * Copyright (C) 2010 OMICRON electronics GmbH */ +#include <linux/compat.h> #include <linux/module.h> #include <linux/posix-clock.h> #include <linux/poll.h> @@ -124,6 +125,9 @@ long ptp_ioctl(struct posix_clock *pc, u struct timespec64 ts; int enable, err = 0; + if (in_compat_syscall() && cmd != PTP_ENABLE_PPS && cmd != PTP_ENABLE_PPS2) + arg = (unsigned long)compat_ptr(arg); + switch 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