1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
  4 *
  5 * Created by:  Nicolas Pitre, July 2016
  6 * Copyright:   (C) 2016 Linaro Limited
  7 */
  8
  9#include <linux/linkage.h>
 10#include <linux/kernel.h>
 11#include <linux/sched.h>
 12#include <linux/errno.h>
 13#include <linux/syscalls.h>
 14#include <linux/ktime.h>
 15#include <linux/timekeeping.h>
 16#include <linux/posix-timers.h>
 17#include <linux/time_namespace.h>
 18#include <linux/compat.h>
 19
 20#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
 21/* Architectures may override SYS_NI and COMPAT_SYS_NI */
 22#include <asm/syscall_wrapper.h>
 23#endif
 24
 25asmlinkage long sys_ni_posix_timers(void)
 26{
 27	pr_err_once("process %d (%s) attempted a POSIX timer syscall "
 28		    "while CONFIG_POSIX_TIMERS is not set\n",
 29		    current->pid, current->comm);
 30	return -ENOSYS;
 31}
 32
 33#ifndef SYS_NI
 34#define SYS_NI(name)  SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
 35#endif
 36
 37#ifndef COMPAT_SYS_NI
 38#define COMPAT_SYS_NI(name)  SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)
 39#endif
 40
 41SYS_NI(timer_create);
 42SYS_NI(timer_gettime);
 43SYS_NI(timer_getoverrun);
 44SYS_NI(timer_settime);
 45SYS_NI(timer_delete);
 46SYS_NI(clock_adjtime);
 47SYS_NI(getitimer);
 48SYS_NI(setitimer);
 49SYS_NI(clock_adjtime32);
 50#ifdef __ARCH_WANT_SYS_ALARM
 51SYS_NI(alarm);
 52#endif
 53
 54/*
 55 * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
 56 * as it is easy to remain compatible with little code. CLOCK_BOOTTIME
 57 * is also included for convenience as at least systemd uses it.
 58 */
 59
 60SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
 61		const struct __kernel_timespec __user *, tp)
 62{
 63	struct timespec64 new_tp;
 64
 65	if (which_clock != CLOCK_REALTIME)
 66		return -EINVAL;
 67	if (get_timespec64(&new_tp, tp))
 68		return -EFAULT;
 69
 70	return do_sys_settimeofday64(&new_tp, NULL);
 71}
 72
 73int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
 74{
 75	switch (which_clock) {
 76	case CLOCK_REALTIME:
 77		ktime_get_real_ts64(tp);
 78		break;
 79	case CLOCK_MONOTONIC:
 80		ktime_get_ts64(tp);
 81		timens_add_monotonic(tp);
 82		break;
 83	case CLOCK_BOOTTIME:
 84		ktime_get_boottime_ts64(tp);
 85		timens_add_boottime(tp);
 86		break;
 87	default:
 88		return -EINVAL;
 89	}
 90
 91	return 0;
 92}
 93SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
 94		struct __kernel_timespec __user *, tp)
 95{
 96	int ret;
 97	struct timespec64 kernel_tp;
 98
 99	ret = do_clock_gettime(which_clock, &kernel_tp);
100	if (ret)
101		return ret;
102
103	if (put_timespec64(&kernel_tp, tp))
104		return -EFAULT;
105	return 0;
106}
107
108SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_timespec __user *, tp)
109{
110	struct timespec64 rtn_tp = {
111		.tv_sec = 0,
112		.tv_nsec = hrtimer_resolution,
113	};
114
115	switch (which_clock) {
116	case CLOCK_REALTIME:
117	case CLOCK_MONOTONIC:
118	case CLOCK_BOOTTIME:
119		if (put_timespec64(&rtn_tp, tp))
120			return -EFAULT;
121		return 0;
122	default:
123		return -EINVAL;
124	}
125}
126
127SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
128		const struct __kernel_timespec __user *, rqtp,
129		struct __kernel_timespec __user *, rmtp)
130{
131	struct timespec64 t;
132	ktime_t texp;
133
134	switch (which_clock) {
135	case CLOCK_REALTIME:
136	case CLOCK_MONOTONIC:
137	case CLOCK_BOOTTIME:
138		break;
139	default:
140		return -EINVAL;
141	}
142
143	if (get_timespec64(&t, rqtp))
144		return -EFAULT;
145	if (!timespec64_valid(&t))
146		return -EINVAL;
147	if (flags & TIMER_ABSTIME)
148		rmtp = NULL;
149	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
150	current->restart_block.nanosleep.rmtp = rmtp;
151	texp = timespec64_to_ktime(t);
152	if (flags & TIMER_ABSTIME)
153		texp = timens_ktime_to_host(which_clock, texp);
154	return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
155				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
156				 which_clock);
157}
158
159#ifdef CONFIG_COMPAT
160COMPAT_SYS_NI(timer_create);
161#endif
162
163#if defined(CONFIG_COMPAT) || defined(CONFIG_ALPHA)
164COMPAT_SYS_NI(getitimer);
165COMPAT_SYS_NI(setitimer);
166#endif
167
168#ifdef CONFIG_COMPAT_32BIT_TIME
169SYS_NI(timer_settime32);
170SYS_NI(timer_gettime32);
171
172SYSCALL_DEFINE2(clock_settime32, const clockid_t, which_clock,
173		struct old_timespec32 __user *, tp)
174{
175	struct timespec64 new_tp;
176
177	if (which_clock != CLOCK_REALTIME)
178		return -EINVAL;
179	if (get_old_timespec32(&new_tp, tp))
180		return -EFAULT;
181
182	return do_sys_settimeofday64(&new_tp, NULL);
183}
184
185SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock,
186		struct old_timespec32 __user *, tp)
187{
188	int ret;
189	struct timespec64 kernel_tp;
190
191	ret = do_clock_gettime(which_clock, &kernel_tp);
192	if (ret)
193		return ret;
194
195	if (put_old_timespec32(&kernel_tp, tp))
196		return -EFAULT;
197	return 0;
198}
199
200SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
201		struct old_timespec32 __user *, tp)
202{
203	struct timespec64 rtn_tp = {
204		.tv_sec = 0,
205		.tv_nsec = hrtimer_resolution,
206	};
207
208	switch (which_clock) {
209	case CLOCK_REALTIME:
210	case CLOCK_MONOTONIC:
211	case CLOCK_BOOTTIME:
212		if (put_old_timespec32(&rtn_tp, tp))
213			return -EFAULT;
214		return 0;
215	default:
216		return -EINVAL;
217	}
218}
219
220SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
221		struct old_timespec32 __user *, rqtp,
222		struct old_timespec32 __user *, rmtp)
223{
224	struct timespec64 t;
225	ktime_t texp;
226
227	switch (which_clock) {
228	case CLOCK_REALTIME:
229	case CLOCK_MONOTONIC:
230	case CLOCK_BOOTTIME:
231		break;
232	default:
233		return -EINVAL;
234	}
235
236	if (get_old_timespec32(&t, rqtp))
237		return -EFAULT;
238	if (!timespec64_valid(&t))
239		return -EINVAL;
240	if (flags & TIMER_ABSTIME)
241		rmtp = NULL;
242	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
243	current->restart_block.nanosleep.compat_rmtp = rmtp;
244	texp = timespec64_to_ktime(t);
245	if (flags & TIMER_ABSTIME)
246		texp = timens_ktime_to_host(which_clock, texp);
247	return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
248				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
249				 which_clock);
250}
251#endif