From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: John Stultz <john.stultz@linaro.org>,
Peter Zijlstra <peterz@infradead.org>,
Michael Kerrisk <mtk.manpages@gmail.com>,
air icy <icytxw@gmail.com>
Subject: [patch 1/2] posix-timers: Make forward callback return s64
Date: Tue, 26 Jun 2018 15:21:31 +0200 [thread overview]
Message-ID: <20180626132704.922098090@linutronix.de> (raw)
In-Reply-To: 20180626132130.345959379@linutronix.de
The posix timer ti_overrun handling is broken because the forwarding
functions can return a huge number of overruns which does not fit in an
int. As a consequence timer_getoverrun(2) and siginfo::si_overrun can turn
into random number generators.
As a first step to address that let the timer_forward() callbacks return
the full 64 bit value.
Cast it to (int) temporarily until k_itimer::ti_overrun is converted to
64bit and the conversion to user space visible values is sanitized.
Reported-by: air icy <icytxw@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/time/alarmtimer.c | 4 ++--
kernel/time/posix-timers.c | 6 +++---
kernel/time/posix-timers.h | 2 +-
3 files changed, 6 insertions(+), 6 deletions(-)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -581,11 +581,11 @@ static void alarm_timer_rearm(struct k_i
* @timr: Pointer to the posixtimer data struct
* @now: Current time to forward the timer against
*/
-static int alarm_timer_forward(struct k_itimer *timr, ktime_t now)
+static s64 alarm_timer_forward(struct k_itimer *timr, ktime_t now)
{
struct alarm *alarm = &timr->it.alarm.alarmtimer;
- return (int) alarm_forward(alarm, timr->it_interval, now);
+ return alarm_forward(alarm, timr->it_interval, now);
}
/**
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -645,11 +645,11 @@ static ktime_t common_hrtimer_remaining(
return __hrtimer_expires_remaining_adjusted(timer, now);
}
-static int common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
+static s64 common_hrtimer_forward(struct k_itimer *timr, ktime_t now)
{
struct hrtimer *timer = &timr->it.real.timer;
- return (int)hrtimer_forward(timer, now, timr->it_interval);
+ return hrtimer_forward(timer, now, timr->it_interval);
}
/*
@@ -702,7 +702,7 @@ void common_timer_get(struct k_itimer *t
* expiry time forward by intervals, so expiry is > now.
*/
if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none))
- timr->it_overrun += kc->timer_forward(timr, now);
+ timr->it_overrun += (int)kc->timer_forward(timr, now);
remaining = kc->timer_remaining(timr, now);
/* Return 0 only, when the timer is expired and not pending */
--- a/kernel/time/posix-timers.h
+++ b/kernel/time/posix-timers.h
@@ -19,7 +19,7 @@ struct k_clock {
void (*timer_get)(struct k_itimer *timr,
struct itimerspec64 *cur_setting);
void (*timer_rearm)(struct k_itimer *timr);
- int (*timer_forward)(struct k_itimer *timr, ktime_t now);
+ s64 (*timer_forward)(struct k_itimer *timr, ktime_t now);
ktime_t (*timer_remaining)(struct k_itimer *timr, ktime_t now);
int (*timer_try_to_cancel)(struct k_itimer *timr);
void (*timer_arm)(struct k_itimer *timr, ktime_t expires,
next prev parent reply other threads:[~2018-06-26 13:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-26 13:21 [patch 0/2] posix-timers: Sanitize posix timer overrun handling Thomas Gleixner
2018-06-26 13:21 ` Thomas Gleixner [this message]
2018-06-29 4:25 ` [patch 1/2] posix-timers: Make forward callback return s64 John Stultz
2018-07-02 9:36 ` [tip:timers/core] " tip-bot for Thomas Gleixner
2018-06-26 13:21 ` [patch 2/2] posix-timers: Sanitize overrun handling Thomas Gleixner
2018-06-29 4:24 ` John Stultz
2018-07-02 9:37 ` [tip:timers/core] " tip-bot for Thomas Gleixner
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