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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-07-02 09:34:29 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2018-12-16 22:08:08 +0000 |
| commit | b396dc52e302a0610abfd6467e20fb58352cdb69 (patch) | |
| tree | d2e6a93384631985d5f4fbb9af00ba717ebacffe /kernel/time | |
| parent | 217adca3b54b81a8d5e194022f3895d9cecb5c8d (diff) | |
| download | linux-stable-b396dc52e302a0610abfd6467e20fb58352cdb69.tar.gz linux-stable-b396dc52e302a0610abfd6467e20fb58352cdb69.tar.bz2 linux-stable-b396dc52e302a0610abfd6467e20fb58352cdb69.zip | |
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: 9a7adcf5c6de ("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>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/alarmtimer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index 28627a9b667b..8c65c236f26a 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -775,7 +775,8 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags, /* Convert (if necessary) to absolute time */ if (flags != TIMER_ABSTIME) { ktime_t now = alarm_bases[type].gettime(); - exp = ktime_add(now, exp); + + exp = ktime_add_safe(now, exp); } if (alarmtimer_do_nsleep(&alarm, exp)) |