Thomas Gleixner f7fbe38cc5 posix-timers: Protect posix clock array access against speculation ...

commit 19b558db12 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-03-28 18:24:46 +02:00

..

alarmtimer.c

alarmtimer: Ensure RTC module is not unloaded

2017-08-31 21:36:45 +02:00

clockevents.c

…

clocksource.c

…

hrtimer.c

hrtimer: Ensure POSIX compliance (relative CLOCK_REALTIME hrtimers)

2018-03-03 10:24:21 +01:00

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

…

Kconfig

…

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ntp_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ntp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

posix-clock.c

…

posix-cpu-timers.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

posix-stubs.c

posix-timers: Use get_timespec64() and put_timespec64()

2017-06-30 04:13:19 -04:00

posix-timers.c

posix-timers: Protect posix clock array access against speculation

2018-03-28 18:24:46 +02:00

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

…

test_udelay.c

…

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-common.c

…

tick-internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

tick-oneshot.c

…

tick-sched.c

nohz: Prevent a timer interrupt storm in tick_nohz_stop_sched_tick()

2018-01-02 20:31:16 +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

time: introduce {get,put}_itimerspec64

2017-06-25 21:58:46 -04:00

timeconst.bc

…

timeconv.c

…

timecounter.c

…

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

timekeeping.c

drivers/pps: aesthetic tweaks to PPS-related content

2017-09-08 18:26:51 -07:00

timekeeping.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

timer_list.c

…

timer.c

timers: Forward timer base before migrating timers

2018-03-08 22:41:04 -08:00