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authorAl Viro <viro@zeniv.linux.org.uk>2017-06-07 09:42:31 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-06-14 00:00:42 +0200
commitedbeda46322fbcb15af2d2d0f2daffb0cd349a5a (patch)
treea4aa5436d4e5dcce6f4d041d13c521e1660331b7 /kernel/time/alarmtimer.c
parent99e6c0e6ec349575886ca7daffc9cb7ec583176f (diff)
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.c16
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 = &current->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;