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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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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