linux-kernel - [PATCH 06/32] posix-timers/timens: Take into account clock offsets

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Message-Id: <20190206001107.16488-7-dima@arista.com>
Date:   Wed,  6 Feb 2019 00:10:40 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Andrei Vagin <avagin@...il.com>, Dmitry Safonov <dima@...sta.com>,
        Adrian Reber <adrian@...as.de>,
        Andrei Vagin <avagin@...nvz.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andy Tucker <agtucker@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jeff Dike <jdike@...toit.com>, Oleg Nesterov <oleg@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        containers@...ts.linux-foundation.org, criu@...nvz.org,
        linux-api@...r.kernel.org, x86@...nel.org
Subject: [PATCH 06/32] posix-timers/timens: Take into account clock offsets

From: Andrei Vagin <avagin@...il.com>

Wire timer_settime() syscall into time namespace virtualization.

Signed-off-by: Andrei Vagin <avagin@...nvz.org>
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 kernel/time/posix-timers.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 782708054df2..d008dfd5b081 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -854,10 +854,6 @@ static int do_timer_settime(timer_t timer_id, int flags,
 	unsigned long flag;
 	int error = 0;
 
-	if (!timespec64_valid(&new_spec64->it_interval) ||
-	    !timespec64_valid(&new_spec64->it_value))
-		return -EINVAL;
-
 	if (old_spec64)
 		memset(old_spec64, 0, sizeof(*old_spec64));
 retry:
@@ -865,6 +861,15 @@ static int do_timer_settime(timer_t timer_id, int flags,
 	if (!timr)
 		return -EINVAL;
 
+	if (flags & TIMER_ABSTIME)
+		timens_clock_to_host(timr->it_clock, &new_spec64->it_value);
+
+	if (!timespec64_valid(&new_spec64->it_interval) ||
+	    !timespec64_valid(&new_spec64->it_value)) {
+		unlock_timer(timr, flag);
+		return -EINVAL;
+	}
+
 	kc = timr->kclock;
 	if (WARN_ON_ONCE(!kc || !kc->timer_set))
 		error = -EINVAL;
-- 
2.20.1