nanosleep: Use get_timespec64() and put_timespec64()

Usage of these apis and their compat versions makes
the syscalls: clock_nanosleep and nanosleep and
their compat implementations simpler.

This is a preparatory patch to isolate data conversions to
struct timespec64 at userspace boundaries. This helps contain
the changes needed to transition to new y2038 safe types.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 255edd5e7a7496f98868f640b581e4ba1a0dedd9..012c37fdb688cb2c169530eb821c02abed2bcdd5 100644 (file)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -453,7 +453,7 @@ static inline u64 hrtimer_forward_now(struct hrtimer *timer,
 
 /* Precise sleep: */
 
-extern int nanosleep_copyout(struct restart_block *, struct timespec *);
+extern int nanosleep_copyout(struct restart_block *, struct timespec64 *);
 extern long hrtimer_nanosleep(const struct timespec64 *rqtp,
                              const enum hrtimer_mode mode,
                              const clockid_t clockid);

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index c991cf212c6dbb588403060958cf831a9cabc2c2..0b8ff7d257ea290743f2d0ab0194488784bc56ef 100644 (file)
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -712,14 +712,14 @@ static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,
                alarmtimer_freezerset(absexp, type);
        restart = &current->restart_block;
        if (restart->nanosleep.type != TT_NONE) {
-               struct timespec rmt;
+               struct timespec64 rmt;
                ktime_t rem;
 
                rem = ktime_sub(absexp, alarm_bases[type].gettime());
 
                if (rem <= 0)
                        return 0;
-               rmt = ktime_to_timespec(rem);
+               rmt = ktime_to_timespec64(rem);
 
                return nanosleep_copyout(restart, &rmt);
        }

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 81da124f11159469c7d392809f9551e7886879ce..88f75f92ef368c53ba8f2a1832068dbe9710cb49 100644 (file)
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1440,17 +1440,17 @@ void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
 }
 EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
 
-int nanosleep_copyout(struct restart_block *restart, struct timespec *ts)
+int nanosleep_copyout(struct restart_block *restart, struct timespec64 *ts)
 {
        switch(restart->nanosleep.type) {
 #ifdef CONFIG_COMPAT
        case TT_COMPAT:
-               if (compat_put_timespec(ts, restart->nanosleep.compat_rmtp))
+               if (compat_put_timespec64(ts, restart->nanosleep.compat_rmtp))
                        return -EFAULT;
                break;
 #endif
        case TT_NATIVE:
-               if (copy_to_user(restart->nanosleep.rmtp, ts, sizeof(struct timespec)))
+               if (put_timespec64(ts, restart->nanosleep.rmtp))
                        return -EFAULT;
                break;
        default:
@@ -1485,11 +1485,11 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
        restart = &current->restart_block;
        if (restart->nanosleep.type != TT_NONE) {
                ktime_t rem = hrtimer_expires_remaining(&t->timer);
-               struct timespec rmt;
+               struct timespec64 rmt;
 
                if (rem <= 0)
                        return 0;
-               rmt = ktime_to_timespec(rem);
+               rmt = ktime_to_timespec64(rem);
 
                return nanosleep_copyout(restart, &rmt);
        }
@@ -1546,19 +1546,17 @@ out:
 SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
                struct timespec __user *, rmtp)
 {
-       struct timespec64 tu64;
-       struct timespec tu;
+       struct timespec64 tu;
 
-       if (copy_from_user(&tu, rqtp, sizeof(tu)))
+       if (get_timespec64(&tu, rqtp))
                return -EFAULT;
 
-       tu64 = timespec_to_timespec64(tu);
-       if (!timespec64_valid(&tu64))
+       if (!timespec64_valid(&tu))
                return -EINVAL;
 
        current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
        current->restart_block.nanosleep.rmtp = rmtp;
-       return hrtimer_nanosleep(&tu64, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
+       return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 }
 
 #ifdef CONFIG_COMPAT
@@ -1566,19 +1564,17 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp,
                       struct compat_timespec __user *, rmtp)
 {
-       struct timespec64 tu64;
-       struct timespec tu;
+       struct timespec64 tu;
 
-       if (compat_get_timespec(&tu, rqtp))
+       if (compat_get_timespec64(&tu, rqtp))
                return -EFAULT;
 
-       tu64 = timespec_to_timespec64(tu);
-       if (!timespec64_valid(&tu64))
+       if (!timespec64_valid(&tu))
                return -EINVAL;
 
        current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
        current->restart_block.nanosleep.compat_rmtp = rmtp;
-       return hrtimer_nanosleep(&tu64, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
+       return hrtimer_nanosleep(&tu, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 }
 #endif
 

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 9df618ee64cf235edfef10d1b113d5cfdc78c783..7323da5950cccbab1277cd0d6cd5f7e585e0fcb4 100644 (file)
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -1314,12 +1314,8 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
                 */
                restart = &current->restart_block;
                restart->nanosleep.expires = expires;
-               if (restart->nanosleep.type != TT_NONE) {
-                       struct timespec ts;
-
-                       ts = timespec64_to_timespec(it.it_value);
-                       error = nanosleep_copyout(restart, &ts);
-               }
+               if (restart->nanosleep.type != TT_NONE)
+                       error = nanosleep_copyout(restart, &it.it_value);
        }
 
        return error;

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 39322ae5dd871bb28a42464fe9a793fe199be759..4b0fc3b0a1c418473c45e55983886474570aa712 100644 (file)
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1213,26 +1213,24 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
                struct timespec __user *, rmtp)
 {
        const struct k_clock *kc = clockid_to_kclock(which_clock);
-       struct timespec64 t64;
-       struct timespec t;
+       struct timespec64 t;
 
        if (!kc)
                return -EINVAL;
        if (!kc->nsleep)
                return -ENANOSLEEP_NOTSUP;
 
-       if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
+       if (get_timespec64(&t, rqtp))
                return -EFAULT;
 
-       t64 = timespec_to_timespec64(t);
-       if (!timespec64_valid(&t64))
+       if (!timespec64_valid(&t))
                return -EINVAL;
        if (flags & TIMER_ABSTIME)
                rmtp = NULL;
        current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
        current->restart_block.nanosleep.rmtp = rmtp;
 
-       return kc->nsleep(which_clock, flags, &t64);
+       return kc->nsleep(which_clock, flags, &t);
 }
 
 #ifdef CONFIG_COMPAT
@@ -1241,26 +1239,24 @@ COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
                       struct compat_timespec __user *, rmtp)
 {
        const struct k_clock *kc = clockid_to_kclock(which_clock);
-       struct timespec64 t64;
-       struct timespec t;
+       struct timespec64 t;
 
        if (!kc)
                return -EINVAL;
        if (!kc->nsleep)
                return -ENANOSLEEP_NOTSUP;
 
-       if (compat_get_timespec(&t, rqtp))
+       if (compat_get_timespec64(&t, rqtp))
                return -EFAULT;
 
-       t64 = timespec_to_timespec64(t);
-       if (!timespec64_valid(&t64))
+       if (!timespec64_valid(&t))
                return -EINVAL;
        if (flags & TIMER_ABSTIME)
                rmtp = NULL;
        current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
        current->restart_block.nanosleep.compat_rmtp = rmtp;
 
-       return kc->nsleep(which_clock, flags, &t64);
+       return kc->nsleep(which_clock, flags, &t);
 }
 #endif