6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh linux@weissschuh.net
[ 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@arndb.de Link: https://lore.kernel.org/lkml/1ba5d3a4-7931-455b-a3ce-85a968a7cb10@app.fastma... Fixes: d94ba80ebbea ("ptp: Added a brand new class driver for ptp clocks.") Signed-off-by: Thomas Weißschuh linux@weissschuh.net Reviewed-by: Cyrill Gorcunov gorcunov@gmail.com Reviewed-by: Arnd Bergmann arnd@arndb.de Acked-by: Richard Cochran richardcochran@gmail.com Link: https://patch.msgid.link/20250125-posix-clock-compat_ioctl-v2-1-11c865c500eb... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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 (cmd) {
case PTP_CLOCK_GETCAPS: