From: Thomas Gleixner <tglx@linutronix.de>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/16] move copyout of timespec into do_cpu_nanosleep()
Date: Tue, 13 Jun 2017 09:46:40 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1706130945110.1919@nanos> (raw)
In-Reply-To: <alpine.DEB.2.20.1706130055070.2152@nanos>
On Tue, 13 Jun 2017, Thomas Gleixner wrote:
> On Wed, 7 Jun 2017, Al Viro wrote:
> > @@ -1242,12 +1243,14 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
> >
> > error = -ERESTART_RESTARTBLOCK;
> > + /*
> > + * Report back to the user the time still remaining.
> > + */
> > + rmtp = restart->nanosleep.rmtp;
> > + if (rmtp) {
> > + struct timespec ts;
> > + ts = timespec64_to_timespec(it.it_value);
> > + if (copy_to_user(rmtp, &ts, sizeof(*rmtp)))
> > + return -EFAULT;
> > + }
> > + restart->nanosleep.expires = timespec64_to_ns(rqtp);
>
> Hmm, this looks wrong. But that was wrong before this patch already.
>
> The restart code needs the absolute expiry time of the timer, but in case
> of flags != ABSTIME rqtp contains the relative expiry time.
>
> So that want's to be fixed first. Need to figure out what's the least ugly
> way to do that. I'll have a look tomorrow.
Misread the code. rqtp is updated with the absolute expiry time when a
signal hits. Though with your changes we can simplify that further and
avoid the whole back and forth timespec conversion.
Thanks,
tglx
next prev parent reply other threads:[~2017-06-13 7:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-07 8:41 [PATCHSET] sanitizing compat nanosleep and other timer-related syscalls Al Viro
2017-06-07 8:42 ` [PATCH 01/16] move copyout of timespec into do_cpu_nanosleep() Al Viro
2017-06-07 8:42 ` [PATCH 02/16] move copyout and freeze handling into alarmtimer_do_nsleep() Al Viro
2017-06-13 22:04 ` [tip:timers/core] alarmtimer: Move " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 03/16] hrtimer_nanosleep(): pass rmtp in restart_block Al Viro
2017-06-13 22:05 ` [tip:timers/core] hrtimer_nanosleep(): Pass " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 04/16] move copyout to do_nanosleel() Al Viro
2017-06-13 22:05 ` [tip:timers/core] hrtimer: Move copyout of remaining time to do_nanosleep() tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 05/16] clock_nanosleep(): stash rmtp into restart_block Al Viro
2017-06-13 22:06 ` [tip:timers/core] posix-timers: Store rmtp into restart_block in sys_clock_nanosleep() tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 06/16] nanosleep/clock_nanosleep: teach to do compat copyouts Al Viro
2017-06-07 10:07 ` Peter Zijlstra
2017-06-13 22:06 ` [tip:timers/core] time/posix-timers: Move the compat copyouts to the nanosleep implementations tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 07/16] {clock_,}nanosleep(2): merge timespec copyout logics into a new helper Al Viro
2017-06-13 22:07 ` [tip:timers/core] hrtimers/posix-timers: Merge nanosleep " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 08/16] kill ->nsleep_restart() Al Viro
2017-06-13 22:08 ` [tip:timers/core] posix-timers: Kill ->nsleep_restart() tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 09/16] move adjtimex-related compat syscalls to native counterparts Al Viro
2017-06-13 22:08 ` [tip:timers/core] ntp: Move adjtimex related " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 10/16] take compat timer_settime(2) to native one Al Viro
2017-06-13 22:09 ` [tip:timers/core] posix-timers: Take " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 11/16] take compat timer_gettime(2) " Al Viro
2017-06-13 22:09 ` [tip:timers/core] posix-timers: Take " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 12/16] move compat itimer syscalls to native ones Al Viro
2017-06-13 22:10 ` [tip:timers/core] itimers: Move " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 13/16] clock_gettime/clock_settime/clock_getres: move to native syscalls Al Viro
2017-06-13 22:10 ` [tip:timers/core] posix-timers: Move compat versions of clock_gettime/settime/getres tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 14/16] timer_create(): move compat to native, get rid of set_fs() Al Viro
2017-06-13 22:11 ` [tip:timers/core] posix-timers: Move compat_timer_create() " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 15/16] time()/stime(): move compat to native Al Viro
2017-06-13 22:11 ` [tip:timers/core] time: Move compat_time()/stime() " tip-bot for Al Viro
2017-06-07 8:42 ` [PATCH 16/16] gettimeofday()/settimeofday(): move compat " Al Viro
2017-06-13 22:12 ` [tip:timers/core] time: Move compat_gettimeofday()/settimeofday() " tip-bot for Al Viro
2017-06-12 23:08 ` [PATCH 01/16] move copyout of timespec into do_cpu_nanosleep() Thomas Gleixner
2017-06-13 7:46 ` Thomas Gleixner [this message]
2017-06-13 22:04 ` [tip:timers/core] posix-cpu-timers: Move " tip-bot for Al Viro
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