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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>
This commit is contained in:
Deepa Dinamani 2017-06-24 11:45:06 -07:00 коммит произвёл Al Viro
Родитель 5c4994102f
Коммит c0edd7c9ac
5 изменённых файлов: 26 добавлений и 38 удалений
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2
include/linux/hrtimer.h
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@ -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);

4
kernel/time/alarmtimer.c
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@ -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);
}

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

8
kernel/time/posix-cpu-timers.c
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@ -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;

20
kernel/time/posix-timers.c
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@ -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