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nanosleep: Use get_timespec64() and put_timespec64()

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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>
This commit is contained in:
Deepa Dinamani
2017-06-24 11:45:06 -07:00
committed by Al Viro
parent 5c4994102f
commit c0edd7c9ac
5 changed files with 26 additions and 38 deletions
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30
kernel/time/hrtimer.c
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@@ -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