Thomas Gleixner 2f8f9e280a posix-timers: Fix division by zero bug ...

commit 0e334db6bb upstream.

The signal delivery path of posix-timers can try to rearm the timer even if
the interval is zero. That's handled for the common case (hrtimer) but not
for alarm timers. In that case the forwarding function raises a division by
zero exception.

The handling for hrtimer based posix timers is wrong because it marks the
timer as active despite the fact that it is stopped.

Move the check from common_hrtimer_rearm() to posixtimer_rearm() to cure
both issues.

Reported-by: syzbot+9d38bedac9cc77b8ad5e@syzkaller.appspotmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: sboyd@kernel.org
Cc: stable@vger.kernel.org
Cc: syzkaller-bugs@googlegroups.com
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1812171328050.1880@nanos.tec.linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-12-29 13:39:09 +01:00

..

alarmtimer.c

posix-timers: Make forward callback return s64

2018-10-03 17:00:50 -07:00

clockevents.c

…

clocksource.c

clocksource: Initialize cs->wd_list

2018-07-22 14:28:48 +02:00

hrtimer.c

hrtimer: Ensure POSIX compliance (relative CLOCK_REALTIME hrtimers)

2018-03-03 10:24:21 +01:00

itimer.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

jiffies.c

…

Kconfig

…

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ntp_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ntp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

posix-clock.c

…

posix-cpu-timers.c

posix-timers: Sanitize overrun handling

2018-10-03 17:00:50 -07:00

posix-stubs.c

…

posix-timers.c

posix-timers: Fix division by zero bug

2018-12-29 13:39:09 +01:00

posix-timers.h

posix-timers: Make forward callback return s64

2018-10-03 17:00:50 -07:00

sched_clock.c

…

test_udelay.c

…

tick-broadcast-hrtimer.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

tick-broadcast.c

tick/broadcast: Use for_each_cpu() specially on UP kernels

2018-05-22 18:54:00 +02:00

tick-common.c

…

tick-internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

tick-oneshot.c

…

tick-sched.c

tick/nohz: Prevent bogus softirq pending warning

2018-09-29 03:06:07 -07:00

tick-sched.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

time.c

time: Make sure jiffies_to_msecs() preserves non-zero time periods

2018-07-03 11:24:56 +02:00

timeconst.bc

…

timeconv.c

…

timecounter.c

…

timekeeping_debug.c

…

timekeeping_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

timekeeping.c

drivers/pps: aesthetic tweaks to PPS-related content

2017-09-08 18:26:51 -07:00

timekeeping.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

timer_list.c

timer/debug: Change /proc/timer_list from 0444 to 0400

2018-12-21 14:13:04 +01:00

timer.c

timers: Clear timer_base::must_forward_clk with timer_base::lock held

2018-09-19 22:43:39 +02:00