[mirror_ubuntu-artful-kernel.git] / kernel / time / posix-stubs.c

/*
 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
 *
 * Created by:  Nicolas Pitre, July 2016
 * Copyright:   (C) 2016 Linaro Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/syscalls.h>
#include <linux/ktime.h>
#include <linux/timekeeping.h>
#include <linux/posix-timers.h>
#include <linux/compat.h>

asmlinkage long sys_ni_posix_timers(void)
{
	pr_err_once("process %d (%s) attempted a POSIX timer syscall "
		    "while CONFIG_POSIX_TIMERS is not set\n",
		    current->pid, current->comm);
	return -ENOSYS;
}

#define SYS_NI(name)  SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
#define COMPAT_SYS_NI(name)  SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)

SYS_NI(timer_create);
SYS_NI(timer_gettime);
SYS_NI(timer_getoverrun);
SYS_NI(timer_settime);
SYS_NI(timer_delete);
SYS_NI(clock_adjtime);
SYS_NI(getitimer);
SYS_NI(setitimer);
#ifdef __ARCH_WANT_SYS_ALARM
SYS_NI(alarm);
#endif

/*
 * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
 * as it is easy to remain compatible with little code. CLOCK_BOOTTIME
 * is also included for convenience as at least systemd uses it.
 */

SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
		const struct timespec __user *, tp)
{
	struct timespec64 new_tp;

	if (which_clock != CLOCK_REALTIME)
		return -EINVAL;
	if (get_timespec64(&new_tp, tp))
		return -EFAULT;

	return do_sys_settimeofday64(&new_tp, NULL);
}

int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
{
	switch (which_clock) {
	case CLOCK_REALTIME:
		ktime_get_real_ts64(tp);
		break;
	case CLOCK_MONOTONIC:
		ktime_get_ts64(tp);
		break;
	case CLOCK_BOOTTIME:
		get_monotonic_boottime64(tp);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}
SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
		struct timespec __user *, tp)
{
	int ret;
	struct timespec64 kernel_tp;

	ret = do_clock_gettime(which_clock, &kernel_tp);
	if (ret)
		return ret;

	if (put_timespec64(&kernel_tp, tp))
		return -EFAULT;
	return 0;
}

SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
{
	struct timespec64 rtn_tp = {
		.tv_sec = 0,
		.tv_nsec = hrtimer_resolution,
	};

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (put_timespec64(&rtn_tp, tp))
			return -EFAULT;
		return 0;
	default:
		return -EINVAL;
	}
}

SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
		const struct timespec __user *, rqtp,
		struct timespec __user *, rmtp)
{
	struct timespec64 t64;
	struct timespec t;

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		break;
	default:
		return -EINVAL;
	}

	if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
		return -EFAULT;
	t64 = timespec_to_timespec64(t);
	if (!timespec64_valid(&t64))
		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 hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
				 which_clock);
}

#ifdef CONFIG_COMPAT
COMPAT_SYS_NI(timer_create);
COMPAT_SYS_NI(clock_adjtime);
COMPAT_SYS_NI(timer_settime);
COMPAT_SYS_NI(timer_gettime);
COMPAT_SYS_NI(getitimer);
COMPAT_SYS_NI(setitimer);

COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
		       struct compat_timespec __user *, tp)
{
	struct timespec64 new_tp;

	if (which_clock != CLOCK_REALTIME)
		return -EINVAL;
	if (compat_get_timespec64(&new_tp, tp))
		return -EFAULT;

	return do_sys_settimeofday64(&new_tp, NULL);
}

COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
		       struct compat_timespec __user *, tp)
{
	int ret;
	struct timespec64 kernel_tp;

	ret = do_clock_gettime(which_clock, &kernel_tp);
	if (ret)
		return ret;

	if (compat_put_timespec64(&kernel_tp, tp))
		return -EFAULT;
	return 0;
}

COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
		       struct compat_timespec __user *, tp)
{
	struct timespec64 rtn_tp = {
		.tv_sec = 0,
		.tv_nsec = hrtimer_resolution,
	};

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		if (compat_put_timespec64(&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)
{
	struct timespec64 t64;
	struct timespec t;

	switch (which_clock) {
	case CLOCK_REALTIME:
	case CLOCK_MONOTONIC:
	case CLOCK_BOOTTIME:
		break;
	default:
		return -EINVAL;
	}

	if (compat_get_timespec(&t, rqtp))
		return -EFAULT;
	t64 = timespec_to_timespec64(t);
	if (!timespec64_valid(&t64))
		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 hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
				 which_clock);
}
#endif
Commit	Line	Data
baa73d9e NP	1	/*
	2	* Dummy stubs used when CONFIG_POSIX_TIMERS=n
	3	*
	4	* Created by: Nicolas Pitre, July 2016
	5	* Copyright: (C) 2016 Linaro Limited
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
	12	#include <linux/linkage.h>
	13	#include <linux/kernel.h>
	14	#include <linux/sched.h>
	15	#include <linux/errno.h>
	16	#include <linux/syscalls.h>
	17	#include <linux/ktime.h>
	18	#include <linux/timekeeping.h>
	19	#include <linux/posix-timers.h>
edbeda46	20	#include <linux/compat.h>
baa73d9e NP	21
	22	asmlinkage long sys_ni_posix_timers(void)
	23	{
	24	pr_err_once("process %d (%s) attempted a POSIX timer syscall "
	25	"while CONFIG_POSIX_TIMERS is not set\n",
	26	current->pid, current->comm);
	27	return -ENOSYS;
	28	}
	29
	30	#define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
3a4d44b6	31	#define COMPAT_SYS_NI(name) SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)
baa73d9e NP	32
	33	SYS_NI(timer_create);
	34	SYS_NI(timer_gettime);
	35	SYS_NI(timer_getoverrun);
	36	SYS_NI(timer_settime);
	37	SYS_NI(timer_delete);
	38	SYS_NI(clock_adjtime);
	39	SYS_NI(getitimer);
	40	SYS_NI(setitimer);
	41	#ifdef __ARCH_WANT_SYS_ALARM
	42	SYS_NI(alarm);
	43	#endif
	44
	45	/*
	46	* We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
	47	* as it is easy to remain compatible with little code. CLOCK_BOOTTIME
	48	* is also included for convenience as at least systemd uses it.
	49	*/
	50
	51	SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
	52	const struct timespec __user *, tp)
	53	{
5c499410	54	struct timespec64 new_tp;
baa73d9e NP	55
	56	if (which_clock != CLOCK_REALTIME)
	57	return -EINVAL;
5c499410	58	if (get_timespec64(&new_tp, tp))
baa73d9e	59	return -EFAULT;
2ac00f17	60
5c499410	61	return do_sys_settimeofday64(&new_tp, NULL);
baa73d9e NP	62	}
baa73d9e NP	63
5c499410	64	int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
baa73d9e	65	{
baa73d9e	66	switch (which_clock) {
5c499410 DD	67	case CLOCK_REALTIME:
	68	ktime_get_real_ts64(tp);
	69	break;
	70	case CLOCK_MONOTONIC:
	71	ktime_get_ts64(tp);
	72	break;
	73	case CLOCK_BOOTTIME:
	74	get_monotonic_boottime64(tp);
	75	break;
	76	default:
	77	return -EINVAL;
baa73d9e	78	}
3c9c12f4	79
5c499410 DD	80	return 0;
	81	}
	82	SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
	83	struct timespec __user *, tp)
	84	{
	85	int ret;
	86	struct timespec64 kernel_tp;
	87
	88	ret = do_clock_gettime(which_clock, &kernel_tp);
	89	if (ret)
	90	return ret;
	91
	92	if (put_timespec64(&kernel_tp, tp))
baa73d9e NP	93	return -EFAULT;
	94	return 0;
	95	}
	96
	97	SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
	98	{
5c499410	99	struct timespec64 rtn_tp = {
baa73d9e NP	100	.tv_sec = 0,
	101	.tv_nsec = hrtimer_resolution,
	102	};
	103
	104	switch (which_clock) {
	105	case CLOCK_REALTIME:
	106	case CLOCK_MONOTONIC:
	107	case CLOCK_BOOTTIME:
5c499410	108	if (put_timespec64(&rtn_tp, tp))
baa73d9e NP	109	return -EFAULT;
	110	return 0;
	111	default:
	112	return -EINVAL;
	113	}
	114	}
	115
	116	SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
	117	const struct timespec __user *, rqtp,
	118	struct timespec __user *, rmtp)
	119	{
ad196384	120	struct timespec64 t64;
baa73d9e NP	121	struct timespec t;
	122
	123	switch (which_clock) {
	124	case CLOCK_REALTIME:
	125	case CLOCK_MONOTONIC:
	126	case CLOCK_BOOTTIME:
edbeda46	127	break;
baa73d9e NP	128	default:
	129	return -EINVAL;
	130	}
edbeda46 AV	131
	132	if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
	133	return -EFAULT;
	134	t64 = timespec_to_timespec64(t);
	135	if (!timespec64_valid(&t64))
	136	return -EINVAL;
	137	if (flags & TIMER_ABSTIME)
	138	rmtp = NULL;
	139	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
	140	current->restart_block.nanosleep.rmtp = rmtp;
	141	return hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
	142	HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
	143	which_clock);
baa73d9e NP	144	}
	145
	146	#ifdef CONFIG_COMPAT
63a766a1 DD	147	COMPAT_SYS_NI(timer_create);
	148	COMPAT_SYS_NI(clock_adjtime);
	149	COMPAT_SYS_NI(timer_settime);
	150	COMPAT_SYS_NI(timer_gettime);
	151	COMPAT_SYS_NI(getitimer);
	152	COMPAT_SYS_NI(setitimer);
	153
d822cdcc AV	154	COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
	155	struct compat_timespec __user *, tp)
	156	{
5c499410	157	struct timespec64 new_tp;
d822cdcc AV	158
	159	if (which_clock != CLOCK_REALTIME)
	160	return -EINVAL;
5c499410	161	if (compat_get_timespec64(&new_tp, tp))
d822cdcc AV	162	return -EFAULT;
d822cdcc AV	163
5c499410	164	return do_sys_settimeofday64(&new_tp, NULL);
d822cdcc AV	165	}
d822cdcc AV	166
5c499410 DD	167	COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
5c499410 DD	168	struct compat_timespec __user *, tp)
d822cdcc	169	{
5c499410 DD	170	int ret;
5c499410 DD	171	struct timespec64 kernel_tp;
d822cdcc	172
5c499410 DD	173	ret = do_clock_gettime(which_clock, &kernel_tp);
	174	if (ret)
	175	return ret;
d822cdcc	176
5c499410	177	if (compat_put_timespec64(&kernel_tp, tp))
d822cdcc AV	178	return -EFAULT;
	179	return 0;
	180	}
	181
5c499410	182	COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
d822cdcc AV	183	struct compat_timespec __user *, tp)
d822cdcc AV	184	{
5c499410	185	struct timespec64 rtn_tp = {
d822cdcc AV	186	.tv_sec = 0,
	187	.tv_nsec = hrtimer_resolution,
	188	};
	189
	190	switch (which_clock) {
	191	case CLOCK_REALTIME:
	192	case CLOCK_MONOTONIC:
	193	case CLOCK_BOOTTIME:
5c499410	194	if (compat_put_timespec64(&rtn_tp, tp))
d822cdcc AV	195	return -EFAULT;
	196	return 0;
	197	default:
	198	return -EINVAL;
	199	}
	200	}
5c499410	201
edbeda46 AV	202	COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
	203	struct compat_timespec __user *, rqtp,
	204	struct compat_timespec __user *, rmtp)
baa73d9e	205	{
edbeda46 AV	206	struct timespec64 t64;
	207	struct timespec t;
	208
	209	switch (which_clock) {
	210	case CLOCK_REALTIME:
	211	case CLOCK_MONOTONIC:
	212	case CLOCK_BOOTTIME:
	213	break;
	214	default:
	215	return -EINVAL;
	216	}
	217
	218	if (compat_get_timespec(&t, rqtp))
	219	return -EFAULT;
	220	t64 = timespec_to_timespec64(t);
	221	if (!timespec64_valid(&t64))
	222	return -EINVAL;
	223	if (flags & TIMER_ABSTIME)
	224	rmtp = NULL;
	225	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
	226	current->restart_block.nanosleep.compat_rmtp = rmtp;
	227	return hrtimer_nanosleep(&t64, flags & TIMER_ABSTIME ?
	228	HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
	229	which_clock);
baa73d9e NP	230	}
baa73d9e NP	231	#endif