Commit 6cd889d4 authored Nov 12, 2019 by Andrei Vagin Committed by Thomas Gleixner Jan 14, 2020

timerfd: Make timerfd_settime() time namespace aware



timerfd_settime() accepts an absolute value of the expiration time if
TFD_TIMER_ABSTIME is specified. This value is in the task's time namespace
and has to be converted to the host's time namespace.

Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-14-dima@arista.com

parent 89dd8eec

fs/timerfd.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@
		#include <linux/syscalls.h>
		#include <linux/compat.h>
		#include <linux/rcupdate.h>
		#include <linux/time_namespace.h>

		struct timerfd_ctx {
		union {
		@@ -196,6 +197,8 @@ static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
		}

		if (texp != 0) {
		if (flags & TFD_TIMER_ABSTIME)
		texp = timens_ktime_to_host(clockid, texp);
		if (isalarm(ctx)) {
		if (flags & TFD_TIMER_ABSTIME)
		alarm_start(&ctx->t.alarm, texp);

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