Thomas Gleixner b99328a60a timekeeping/vsyscall: Prevent math overflow in BOOTTIME update ...

The VDSO update for CLOCK_BOOTTIME has a overflow issue as it shifts the
nanoseconds based boot time offset left by the clocksource shift. That
overflows once the boot time offset becomes large enough. As a consequence
CLOCK_BOOTTIME in the VDSO becomes a random number causing applications to
misbehave.

Fix it by storing a timespec64 representation of the offset when boot time
is adjusted and add that to the MONOTONIC base time value in the vdso data
page. Using the timespec64 representation avoids a 64bit division in the
update code.

Fixes: 44f57d788e ("timekeeping: Provide a generic update_vsyscall() implementation")
Reported-by: Chris Clayton <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Chris Clayton <[email protected]>
Tested-by: Vincenzo Frascino <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

2019-08-23 02:12:11 +02:00

..

alarmtimer.c

alarmtimer: Fix kerneldoc comment for alarmtimer_suspend()

2019-06-14 17:04:04 +02:00

clockevents.c

tick: Remove outgoing CPU from broadcast masks

2019-03-23 18:26:43 +01:00

clocksource.c

clocksource: Move inline keyword to the beginning of function declarations

2019-06-14 17:04:03 +02:00

hrtimer.c

hrtimer: Use a bullet for the returns bullet list

2019-06-27 23:30:04 +02:00

itimer.c

…

jiffies.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-05-06 14:50:46 -07:00

Kconfig

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00

Makefile

timekeeping: Provide a generic update_vsyscall() implementation

2019-06-22 21:21:06 +02:00

ntp_internal.h

ntp: Audit NTP parameters adjustment

2019-04-15 18:14:01 -04:00

ntp.c

ntp: Limit TAI-UTC offset

2019-06-22 11:28:53 +02:00

posix-clock.c

timex: use __kernel_timex internally

2019-02-07 00:13:27 +01:00

posix-cpu-timers.c

posix-cpu-timers: Remove private interval storage

2019-01-15 16:36:13 +01:00

posix-stubs.c

y2038: syscalls: rename y2038 compat syscalls

2019-02-07 00:13:27 +01:00

posix-timers.c

posix-timers: Use spin_lock_irq() in itimer_delete()

2019-06-22 12:14:22 +02:00

posix-timers.h

timex: use __kernel_timex internally

2019-02-07 00:13:27 +01:00

sched_clock.c

Merge tag 'printk-for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

2019-05-07 09:18:12 -07:00

test_udelay.c

…

tick-broadcast-hrtimer.c

…

tick-broadcast.c

tick: Fix typos in comments

2019-04-19 19:17:04 +02:00

tick-common.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2019-05-06 14:50:46 -07:00

tick-internal.h

tick: Remove outgoing CPU from broadcast masks

2019-03-23 18:26:43 +01:00

tick-oneshot.c

…

tick-sched.c

sched/fair: Remove the rq->cpu_load[] update code

2019-06-03 11:49:38 +02:00

tick-sched.h

tick/sched: Update tick_sched struct documentation

2019-03-24 20:29:32 +01:00

time.c

time: Validate user input in compat_settimeofday()

2019-07-07 12:05:40 +02:00

timeconst.bc

…

timeconv.c

…

timecounter.c

…

timekeeping_debug.c

timekeeping/debug: No need to check return value of debugfs_create functions

2019-01-29 20:08:41 +01:00

timekeeping_internal.h

…

timekeeping.c

timekeeping/vsyscall: Prevent math overflow in BOOTTIME update

2019-08-23 02:12:11 +02:00

timekeeping.h

timers/sched_clock: Prevent generic sched_clock wrap caused by tick_freeze()

2019-04-18 14:34:53 +02:00

timer_list.c

timer_list: Guard procfs specific code

2019-06-23 00:08:52 +02:00

timer.c

Merge tag 'printk-for-5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

2019-05-07 09:18:12 -07:00

vsyscall.c

timekeeping/vsyscall: Prevent math overflow in BOOTTIME update

2019-08-23 02:12:11 +02:00