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6fec64e1c9
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
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#define TIMER_RETRY 1
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struct k_clock {
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int (*clock_getres)(const clockid_t which_clock,
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struct timespec64 *tp);
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int (*clock_set)(const clockid_t which_clock,
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const struct timespec64 *tp);
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int (*clock_get)(const clockid_t which_clock,
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struct timespec64 *tp);
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int (*clock_adj)(const clockid_t which_clock, struct timex *tx);
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int (*timer_create)(struct k_itimer *timer);
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int (*nsleep)(const clockid_t which_clock, int flags,
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const struct timespec64 *);
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int (*timer_set)(struct k_itimer *timr, int flags,
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struct itimerspec64 *new_setting,
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struct itimerspec64 *old_setting);
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int (*timer_del)(struct k_itimer *timr);
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void (*timer_get)(struct k_itimer *timr,
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struct itimerspec64 *cur_setting);
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void (*timer_rearm)(struct k_itimer *timr);
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s64 (*timer_forward)(struct k_itimer *timr, ktime_t now);
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ktime_t (*timer_remaining)(struct k_itimer *timr, ktime_t now);
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int (*timer_try_to_cancel)(struct k_itimer *timr);
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void (*timer_arm)(struct k_itimer *timr, ktime_t expires,
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bool absolute, bool sigev_none);
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};
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extern const struct k_clock clock_posix_cpu;
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extern const struct k_clock clock_posix_dynamic;
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extern const struct k_clock clock_process;
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extern const struct k_clock clock_thread;
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extern const struct k_clock alarm_clock;
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int posix_timer_event(struct k_itimer *timr, int si_private);
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void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting);
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int common_timer_set(struct k_itimer *timr, int flags,
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struct itimerspec64 *new_setting,
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struct itimerspec64 *old_setting);
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int common_timer_del(struct k_itimer *timer);
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