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Emit an audit record every time selected NTP parameters are modified from userspace (via adjtimex(2) or clock_adjtime(2)). These parameters may be used to indirectly change system clock, and thus their modifications should be audited. Such events will now generate records of type AUDIT_TIME_ADJNTPVAL containing the following fields: - op -- which value was adjusted: - offset -- corresponding to the time_offset variable - freq -- corresponding to the time_freq variable - status -- corresponding to the time_status variable - adjust -- corresponding to the time_adjust variable - tick -- corresponding to the tick_usec variable - tai -- corresponding to the timekeeping's TAI offset - old -- the old value - new -- the new value Example records: type=TIME_ADJNTPVAL msg=audit(1530616044.507:7): op=status old=64 new=8256 type=TIME_ADJNTPVAL msg=audit(1530616044.511:11): op=freq old=0 new=49180377088000 The records of this type will be associated with the corresponding syscall records. An overview of parameter changes that can be done via do_adjtimex() (based on information from Miroslav Lichvar) and whether they are audited: __timekeeping_set_tai_offset() -- sets the offset from the International Atomic Time (AUDITED) NTP variables: time_offset -- can adjust the clock by up to 0.5 seconds per call and also speed it up or slow down by up to about 0.05% (43 seconds per day) (AUDITED) time_freq -- can speed up or slow down by up to about 0.05% (AUDITED) time_status -- can insert/delete leap seconds and it also enables/ disables synchronization of the hardware real-time clock (AUDITED) time_maxerror, time_esterror -- change error estimates used to inform userspace applications (NOT AUDITED) time_constant -- controls the speed of the clock adjustments that are made when time_offset is set (NOT AUDITED) time_adjust -- can temporarily speed up or slow down the clock by up to 0.05% (AUDITED) tick_usec -- a more extreme version of time_freq; can speed up or slow down the clock by up to 10% (AUDITED) Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com> Reviewed-by: Richard Guy Briggs <rgb@redhat.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Paul Moore <paul@paul-moore.com>
15 lines
605 B
C
15 lines
605 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_NTP_INTERNAL_H
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#define _LINUX_NTP_INTERNAL_H
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extern void ntp_init(void);
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extern void ntp_clear(void);
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/* Returns how long ticks are at present, in ns / 2^NTP_SCALE_SHIFT. */
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extern u64 ntp_tick_length(void);
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extern ktime_t ntp_get_next_leap(void);
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extern int second_overflow(time64_t secs);
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extern int __do_adjtimex(struct __kernel_timex *txc,
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const struct timespec64 *ts,
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s32 *time_tai, struct audit_ntp_data *ad);
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extern void __hardpps(const struct timespec64 *phase_ts, const struct timespec64 *raw_ts);
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#endif /* _LINUX_NTP_INTERNAL_H */
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