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android_kernel_samsung_msm8226/kernel/time
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Thomas Gleixner 20f62cf9ff alarmtimer: Prevent overflow for relative nanosleep 
commit 5f936e19cc0ef97dbe3a56e9498922ad5ba1edef upstream.

Air Icy reported:

  UBSAN: Undefined behaviour in kernel/time/alarmtimer.c:811:7
  signed integer overflow:
  1529859276030040771 + 9223372036854775807 cannot be represented in type 'long long int'
  Call Trace:
   alarm_timer_nsleep+0x44c/0x510 kernel/time/alarmtimer.c:811
   __do_sys_clock_nanosleep kernel/time/posix-timers.c:1235 [inline]
   __se_sys_clock_nanosleep kernel/time/posix-timers.c:1213 [inline]
   __x64_sys_clock_nanosleep+0x326/0x4e0 kernel/time/posix-timers.c:1213
   do_syscall_64+0xb8/0x3a0 arch/x86/entry/common.c:290

alarm_timer_nsleep() uses ktime_add() to add the current time and the
relative expiry value. ktime_add() has no sanity checks so the addition
can overflow when the relative timeout is large enough.

Use ktime_add_safe() which has the necessary sanity checks in place and
limits the result to the valid range.

Fixes: 9a7adcf5c6 ("timers: Posix interface for alarm-timers")
Reported-by: Team OWL337 <icytxw@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1807020926360.1595@nanos.tec.linutronix.de
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Change-Id: I00ed8e38ea6298a086849e2fc9fee46f3e6bd5d1
CVE-2018-13053
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>
2020-01-06 08:40:43 +01:00
..
alarmtimer.c alarmtimer: Prevent overflow for relative nanosleep 2020-01-06 08:40:43 +01:00
clockevents.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
clocksource.c clocksource: Extract max nsec calculation into separate function 2019-08-05 14:21:54 +02:00
jiffies.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
Kconfig tick: Document TICK_ONESHOT config option 2012-03-31 12:45:43 +02:00
Makefile Revert "HACK: time: Disable alarmtimer" 2019-08-06 12:31:27 +02:00
ntp.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
posix-clock.c kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure 2011-10-31 19:30:05 -04:00
sched_clock.c sched_clock: Backport high-resolution support 2019-08-05 14:21:53 +02:00
tick-broadcast.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
tick-common.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
tick-internal.h clockevents: Make minimum delay adjustments configurable 2011-09-08 11:10:56 +02:00
tick-oneshot.c clockevents: Make minimum delay adjustments configurable 2011-09-08 11:10:56 +02:00
tick-sched.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
timecompare.c
timeconv.c
timekeeping.c Merge tag 'v3.4.113' into lineage-16.0 2019-08-05 14:20:47 +02:00
timer_list.c time: Remove CONFIG_TIMER_STATS 2019-08-06 12:26:30 +02:00