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
 73static int 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}
 93
 94SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
 95		struct __kernel_timespec __user *, tp)
 96{
 97	int ret;
 98	struct timespec64 kernel_tp;
 99
100	ret = do_clock_gettime(which_clock, &kernel_tp);
101	if (ret)
102		return ret;
103
104	if (put_timespec64(&kernel_tp, tp))
105		return -EFAULT;
106	return 0;
107}
108
109SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct __kernel_timespec __user *, tp)
110{
111	struct timespec64 rtn_tp = {
112		.tv_sec = 0,
113		.tv_nsec = hrtimer_resolution,
114	};
115
116	switch (which_clock) {
117	case CLOCK_REALTIME:
118	case CLOCK_MONOTONIC:
119	case CLOCK_BOOTTIME:
120		if (put_timespec64(&rtn_tp, tp))
121			return -EFAULT;
122		return 0;
123	default:
124		return -EINVAL;
125	}
126}
127
128SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
129		const struct __kernel_timespec __user *, rqtp,
130		struct __kernel_timespec __user *, rmtp)
131{
132	struct timespec64 t;
133	ktime_t texp;
134
135	switch (which_clock) {
136	case CLOCK_REALTIME:
137	case CLOCK_MONOTONIC:
138	case CLOCK_BOOTTIME:
139		break;
140	default:
141		return -EINVAL;
142	}
143
144	if (get_timespec64(&t, rqtp))
145		return -EFAULT;
146	if (!timespec64_valid(&t))
147		return -EINVAL;
148	if (flags & TIMER_ABSTIME)
149		rmtp = NULL;
150	current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
151	current->restart_block.nanosleep.rmtp = rmtp;
152	texp = timespec64_to_ktime(t);
153	if (flags & TIMER_ABSTIME)
154		texp = timens_ktime_to_host(which_clock, texp);
155	return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
156				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
157				 which_clock);
158}
159
160#ifdef CONFIG_COMPAT
161COMPAT_SYS_NI(timer_create);
162#endif
163
164#if defined(CONFIG_COMPAT) || defined(CONFIG_ALPHA)
165COMPAT_SYS_NI(getitimer);
166COMPAT_SYS_NI(setitimer);
167#endif
168
169#ifdef CONFIG_COMPAT_32BIT_TIME
170SYS_NI(timer_settime32);
171SYS_NI(timer_gettime32);
172
173SYSCALL_DEFINE2(clock_settime32, const clockid_t, which_clock,
174		struct old_timespec32 __user *, tp)
175{
176	struct timespec64 new_tp;
177
178	if (which_clock != CLOCK_REALTIME)
179		return -EINVAL;
180	if (get_old_timespec32(&new_tp, tp))
181		return -EFAULT;
182
183	return do_sys_settimeofday64(&new_tp, NULL);
184}
185
186SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock,
187		struct old_timespec32 __user *, tp)
188{
189	int ret;
190	struct timespec64 kernel_tp;
191
192	ret = do_clock_gettime(which_clock, &kernel_tp);
193	if (ret)
194		return ret;
195
196	if (put_old_timespec32(&kernel_tp, tp))
197		return -EFAULT;
198	return 0;
199}
200
201SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock,
202		struct old_timespec32 __user *, tp)
203{
204	struct timespec64 rtn_tp = {
205		.tv_sec = 0,
206		.tv_nsec = hrtimer_resolution,
207	};
208
209	switch (which_clock) {
210	case CLOCK_REALTIME:
211	case CLOCK_MONOTONIC:
212	case CLOCK_BOOTTIME:
213		if (put_old_timespec32(&rtn_tp, tp))
214			return -EFAULT;
215		return 0;
216	default:
217		return -EINVAL;
218	}
219}
220
221SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags,
222		struct old_timespec32 __user *, rqtp,
223		struct old_timespec32 __user *, rmtp)
224{
225	struct timespec64 t;
226	ktime_t texp;
227
228	switch (which_clock) {
229	case CLOCK_REALTIME:
230	case CLOCK_MONOTONIC:
231	case CLOCK_BOOTTIME:
232		break;
233	default:
234		return -EINVAL;
235	}
236
237	if (get_old_timespec32(&t, rqtp))
238		return -EFAULT;
239	if (!timespec64_valid(&t))
240		return -EINVAL;
241	if (flags & TIMER_ABSTIME)
242		rmtp = NULL;
243	current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
244	current->restart_block.nanosleep.compat_rmtp = rmtp;
245	texp = timespec64_to_ktime(t);
246	if (flags & TIMER_ABSTIME)
247		texp = timens_ktime_to_host(which_clock, texp);
248	return hrtimer_nanosleep(texp, flags & TIMER_ABSTIME ?
249				 HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
250				 which_clock);
251}
252#endif