diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2018-06-26 15:21:31 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-07-02 11:33:25 +0200 |
| commit | 6fec64e1c92d5c715c6d0f50786daa7708266bde (patch) | |
| tree | 1d94835987721b47b135175daf2524835c762335 /kernel/time/posix-timers.h | |
| parent | 6ff84735070276d72af716e21c3214ee20d60e70 (diff) | |
| download | linux-6fec64e1c92d5c715c6d0f50786daa7708266bde.tar.gz | |
posix-timers: Make forward callback return s64
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: Team OWL337 <icytxw@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Link: https://lkml.kernel.org/r/20180626132704.922098090@linutronix.de
Diffstat (limited to 'kernel/time/posix-timers.h')
| -rw-r--r-- | kernel/time/posix-timers.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h index 151e28f5bf304c..ddb21145211a02 100644 --- 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, |