alarmtimer: Make nanosleep() time namespace aware

clock_nanosleep() accepts absolute values of expiration time when the
TIMER_ABSTIME flag is set. This absolute value is inside the task's
time namespace and has to be converted to the host's time.

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-16-dima@arista.com

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 9a8e81b..b51b36e 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -839,6 +839,8 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
                ktime_t now = alarm_bases[type].get_ktime();
 
                exp = ktime_add_safe(now, exp);
+       } else {
+               exp = timens_ktime_to_host(which_clock, exp);
        }
 
        ret = alarmtimer_do_nsleep(&alarm, exp, type);