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Date: Wed, 7 Jun 2017 09:42:38 +0100
From: Al Viro <viro@...IV.linux.org.uk>
To: linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 13/16] clock_gettime/clock_settime/clock_getres: move to native syscalls
From: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
kernel/compat.c | 51 -----------------------------------
kernel/time/posix-stubs.c | 52 ++++++++++++++++++++++++++++++++++++
kernel/time/posix-timers.c | 66 +++++++++++++++++++++++++++++++++++++++++++---
3 files changed, 114 insertions(+), 55 deletions(-)
diff --git a/kernel/compat.c b/kernel/compat.c
index 61e3be4cbd2a..e19ea2f06212 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -596,57 +596,6 @@ COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock,
return sys_timer_create(which_clock, event, created_timer_id);
}
-COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
- struct compat_timespec __user *, tp)
-{
- long err;
- mm_segment_t oldfs;
- struct timespec ts;
-
- if (compat_get_timespec(&ts, tp))
- return -EFAULT;
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = sys_clock_settime(which_clock,
- (struct timespec __user *) &ts);
- set_fs(oldfs);
- return err;
-}
-
-COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
- struct compat_timespec __user *, tp)
-{
- long err;
- mm_segment_t oldfs;
- struct timespec ts;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = sys_clock_gettime(which_clock,
- (struct timespec __user *) &ts);
- set_fs(oldfs);
- if (!err && compat_put_timespec(&ts, tp))
- return -EFAULT;
- return err;
-}
-
-COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
- struct compat_timespec __user *, tp)
-{
- long err;
- mm_segment_t oldfs;
- struct timespec ts;
-
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- err = sys_clock_getres(which_clock,
- (struct timespec __user *) &ts);
- set_fs(oldfs);
- if (!err && tp && compat_put_timespec(&ts, tp))
- return -EFAULT;
- return err;
-}
-
/*
* We currently only need the following fields from the sigevent
* structure: sigev_value, sigev_signo, sig_notify and (sometimes
diff --git a/kernel/time/posix-stubs.c b/kernel/time/posix-stubs.c
index 369df2f9a9ff..ce45ab06fb3e 100644
--- a/kernel/time/posix-stubs.c
+++ b/kernel/time/posix-stubs.c
@@ -135,6 +135,58 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
}
#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
+ struct compat_timespec __user *, tp)
+{
+ struct timespec64 new_tp64;
+ struct timespec new_tp;
+
+ if (which_clock != CLOCK_REALTIME)
+ return -EINVAL;
+ if (compat_get_timespec(&new_tp, tp))
+ return -EFAULT;
+
+ new_tp64 = timespec_to_timespec64(new_tp);
+ return do_sys_settimeofday64(&new_tp64, NULL);
+}
+
+COMPAT_SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
+ struct compat_timespec __user *,tp)
+{
+ struct timespec64 kernel_tp64;
+ struct timespec kernel_tp;
+
+ switch (which_clock) {
+ case CLOCK_REALTIME: ktime_get_real_ts64(&kernel_tp64); break;
+ case CLOCK_MONOTONIC: ktime_get_ts64(&kernel_tp64); break;
+ case CLOCK_BOOTTIME: get_monotonic_boottime64(&kernel_tp64); break;
+ default: return -EINVAL;
+ }
+
+ kernel_tp = timespec64_to_timespec(kernel_tp64);
+ if (compat_put_timespec(&kernel_tp, tp))
+ return -EFAULT;
+ return 0;
+}
+
+COMPAT_SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct compat_timespec __user *, tp)
+{
+ struct timespec rtn_tp = {
+ .tv_sec = 0,
+ .tv_nsec = hrtimer_resolution,
+ };
+
+ switch (which_clock) {
+ case CLOCK_REALTIME:
+ case CLOCK_MONOTONIC:
+ case CLOCK_BOOTTIME:
+ if (compat_put_timespec(&rtn_tp, tp))
+ return -EFAULT;
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
struct compat_timespec __user *, rqtp,
struct compat_timespec __user *, rmtp)
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 489ef1b6cd65..5c2b566f1a5c 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1068,8 +1068,66 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
return err;
}
+SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
+ struct timespec __user *, tp)
+{
+ const struct k_clock *kc = clockid_to_kclock(which_clock);
+ struct timespec64 rtn_tp64;
+ struct timespec rtn_tp;
+ int error;
+
+ if (!kc)
+ return -EINVAL;
+
+ error = kc->clock_getres(which_clock, &rtn_tp64);
+ rtn_tp = timespec64_to_timespec(rtn_tp64);
+
+ if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp)))
+ error = -EFAULT;
+
+ return error;
+}
+
#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock,
+ struct compat_timespec __user *, tp)
+{
+ const struct k_clock *kc = clockid_to_kclock(which_clock);
+ struct timespec64 new_tp64;
+ struct timespec new_tp;
+
+ if (!kc || !kc->clock_set)
+ return -EINVAL;
+
+ if (compat_get_timespec(&new_tp, tp))
+ return -EFAULT;
+
+ new_tp64 = timespec_to_timespec64(new_tp);
+
+ return kc->clock_set(which_clock, &new_tp64);
+}
+
+COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
+ struct compat_timespec __user *, tp)
+{
+ const struct k_clock *kc = clockid_to_kclock(which_clock);
+ struct timespec64 kernel_tp64;
+ struct timespec kernel_tp;
+ int error;
+
+ if (!kc)
+ return -EINVAL;
+
+ error = kc->clock_get(which_clock, &kernel_tp64);
+ kernel_tp = timespec64_to_timespec(kernel_tp64);
+
+ if (!error && compat_put_timespec(&kernel_tp, tp))
+ error = -EFAULT;
+
+ return error;
+}
+
COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
struct compat_timex __user *, utp)
{
@@ -1093,10 +1151,9 @@ COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock,
return err;
}
-#endif
-SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
- struct timespec __user *, tp)
+COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
+ struct compat_timespec __user *, tp)
{
const struct k_clock *kc = clockid_to_kclock(which_clock);
struct timespec64 rtn_tp64;
@@ -1109,11 +1166,12 @@ SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
error = kc->clock_getres(which_clock, &rtn_tp64);
rtn_tp = timespec64_to_timespec(rtn_tp64);
- if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp)))
+ if (!error && tp && compat_put_timespec(&rtn_tp, tp))
error = -EFAULT;
return error;
}
+#endif
/*
* nanosleep for monotonic and realtime clocks
--
2.11.0
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