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| author |   Al Viro <viro@zeniv.linux.org.uk> | 2017-06-07 09:42:31 +0100 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2017-06-14 00:00:42 +0200 |
| commit | edbeda46322fbcb15af2d2d0f2daffb0cd349a5a (patch) | |
| tree | a4aa5436d4e5dcce6f4d041d13c521e1660331b7 /kernel/time/alarmtimer.c | |
| parent | posix-timers: Store rmtp into restart_block in sys_clock_nanosleep() (diff) | |
| download | linux-dev-edbeda46322fbcb15af2d2d0f2daffb0cd349a5a.tar.xz linux-dev-edbeda46322fbcb15af2d2d0f2daffb0cd349a5a.zip | |
time/posix-timers: Move the compat copyouts to the nanosleep implementations
Turn restart_block.nanosleep.{rmtp,compat_rmtp} into a tagged union (kind =
1 -> native, kind = 2 -> compat, kind = 0 -> nothing) and make the places
doing actual copyout handle compat as well as native (that will become a
helper in the next commit). Result: compat wrappers, messing with
reassignments, etc. are gone.
[ tglx: Folded in a variant of Peter Zijlstras enum patch ]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170607084241.28657-6-viro@ZenIV.linux.org.uk
Diffstat (limited to 'kernel/time/alarmtimer.c')
| -rw-r--r-- | kernel/time/alarmtimer.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index d859a3601ddd..57bcf94ee132 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -27,6 +27,7 @@ #include <linux/posix-timers.h> #include <linux/workqueue.h> #include <linux/freezer.h> +#include <linux/compat.h> #include "posix-timers.h" @@ -691,7 +692,7 @@ static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm, static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp, enum alarmtimer_type type) { - struct timespec __user *rmtp; + struct restart_block *restart; alarm->data = (void *)current; do { set_current_state(TASK_INTERRUPTIBLE); @@ -709,8 +710,8 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp, if (freezing(current)) alarmtimer_freezerset(absexp, type); - rmtp = current->restart_block.nanosleep.rmtp; - if (rmtp) { + restart = ¤t->restart_block; + if (restart->nanosleep.type != TT_NONE) { struct timespec rmt; ktime_t rem; @@ -720,7 +721,14 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp, return 0; rmt = ktime_to_timespec(rem); - if (copy_to_user(rmtp, &rmt, sizeof(*rmtp))) +#ifdef CONFIG_COMPAT + if (restart->nanosleep.type == TT_COMPAT) { + if (compat_put_timespec(&rmt, + restart->nanosleep.compat_rmtp)) + return -EFAULT; + } else +#endif + if (copy_to_user(restart->nanosleep.rmtp, &rmt, sizeof(rmt))) return -EFAULT; } return -ERESTART_RESTARTBLOCK; |