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Thomas Gleixner 19b558db12 posix-timers: Protect posix clock array access against speculation 
The clockid argument of clockid_to_kclock() comes straight from user space
via various syscalls and is used as index into the posix_clocks array.

Protect it against spectre v1 array out of bounds speculation. Remove the
redundant check for !posix_clock[id] as this is another source for
speculation and does not provide any advantage over the return
posix_clock[id] path which returns NULL in that case anyway.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Link: https://lkml.kernel.org/r/alpine.DEB.2.21.1802151718320.1296@nanos.tec.linutronix.de
 		2018-03-22 12:29:27 +01:00
..
Kconfig sched/isolation: Make CONFIG_NO_HZ_FULL select CONFIG_CPU_ISOLATION 2017-12-18 13:46:42 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
alarmtimer.c alarmtimer: Ensure RTC module is not unloaded 2017-08-31 21:36:45 +02:00
clockevents.c clockevents: Retry programming min delta up to 10 times 2017-10-19 16:29:15 +02:00
clocksource.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
hrtimer.c hrtimer: remove unneeded kallsyms include 2018-02-06 18:32:47 -08:00
itimer.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jiffies.c jiffies: Revert bogus conversion of NSEC_PER_SEC to TICK_NSEC 2017-03-07 11:03:28 +01:00
ntp.c Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
ntp_internal.h Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
posix-clock.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
posix-cpu-timers.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-01-30 11:55:56 -08:00
posix-stubs.c posix-stubs: Use get_timespec64() and put_timespec64() 2017-10-17 17:22:27 +02:00
posix-timers.c posix-timers: Protect posix clock array access against speculation 2018-03-22 12:29:27 +01:00
posix-timers.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sched_clock.c timers, sched_clock: Update timeout for clock wrap 2017-03-23 12:30:27 -07:00
test_udelay.c time: Avoid timespec in udelay_test 2016-06-20 12:47:26 -07:00
tick-broadcast-hrtimer.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tick-broadcast.c tick/broadcast: Make tick_broadcast_setup_oneshot() static 2017-06-12 18:56:01 +02:00
tick-common.c ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
tick-internal.h hrtimer: Unify remote enqueue handling 2018-01-16 02:53:58 +01:00
tick-oneshot.c clockevents: Update clockevents device next_event on stop 2017-11-01 18:20:17 +01:00
tick-sched.c hrtimer: Optimize the hrtimer code by using static keys for migration_enable/nohz_active 2018-01-16 02:35:44 +01:00
tick-sched.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
time.c Merge branch 'fortglx/4.15/time' of https://git.linaro.org/people/john.stultz/linux into timers/core 2017-10-31 23:17:28 +01:00
timeconst.bc time: Introduce jiffies64_to_nsecs() 2017-02-01 09:13:45 +01:00
timeconv.c time: Add time64_to_tm() 2016-06-20 12:47:15 -07:00
timecounter.c clocksource: Use a plain u64 instead of cycle_t 2016-12-25 11:04:12 +01:00
timekeeping.c timekeeping: Remove CONFIG_GENERIC_TIME_VSYSCALL_OLD 2017-11-14 11:20:25 +01:00
timekeeping.h Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
timekeeping_debug.c PM / timekeeping: Print debug messages when requested 2017-07-23 00:03:43 +02:00
timekeeping_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
timer.c timers: Forward timer base before migrating timers 2018-02-28 23:34:33 +01:00
timer_list.c timer/debug: Change /proc/timer_list from 0444 to 0400 2017-11-13 16:04:06 +01:00