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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
This commit is contained in:
Andrei Vagin 2019-11-12 01:27:02 +00:00 committed by Thomas Gleixner
parent 89dd8eecfe
commit 6cd889d43c
1 changed files with 3 additions and 0 deletions
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3
fs/timerfd.c
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@ -26,6 +26,7 @@
#include <linux/syscalls.h> #include <linux/syscalls.h>
#include <linux/compat.h> #include <linux/compat.h>
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/time_namespace.h>
struct timerfd_ctx { struct timerfd_ctx {
union { union {
@ -196,6 +197,8 @@ static int timerfd_setup(struct timerfd_ctx *ctx, int flags,
} }
if (texp != 0) { if (texp != 0) {
if (flags & TFD_TIMER_ABSTIME)
texp = timens_ktime_to_host(clockid, texp);
if (isalarm(ctx)) { if (isalarm(ctx)) {
if (flags & TFD_TIMER_ABSTIME) if (flags & TFD_TIMER_ABSTIME)
alarm_start(&ctx->t.alarm, texp); alarm_start(&ctx->t.alarm, texp);