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
sys_ni_posix_timers(void)25 asmlinkage 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
41 SYS_NI(timer_create);
42 SYS_NI(timer_gettime);
43 SYS_NI(timer_getoverrun);
44 SYS_NI(timer_settime);
45 SYS_NI(timer_delete);
46 SYS_NI(clock_adjtime);
47 SYS_NI(getitimer);
48 SYS_NI(setitimer);
49 SYS_NI(clock_adjtime32);
50 #ifdef __ARCH_WANT_SYS_ALARM
51 SYS_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
SYSCALL_DEFINE2(clock_settime,const clockid_t,which_clock,const struct __kernel_timespec __user *,tp)60 SYSCALL_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
do_clock_gettime(clockid_t which_clock,struct timespec64 * tp)73 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 }
SYSCALL_DEFINE2(clock_gettime,const clockid_t,which_clock,struct __kernel_timespec __user *,tp)93 SYSCALL_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
SYSCALL_DEFINE2(clock_getres,const clockid_t,which_clock,struct __kernel_timespec __user *,tp)108 SYSCALL_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
SYSCALL_DEFINE4(clock_nanosleep,const clockid_t,which_clock,int,flags,const struct __kernel_timespec __user *,rqtp,struct __kernel_timespec __user *,rmtp)127 SYSCALL_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
160 COMPAT_SYS_NI(timer_create);
161 #endif
162
163 #if defined(CONFIG_COMPAT) || defined(CONFIG_ALPHA)
164 COMPAT_SYS_NI(getitimer);
165 COMPAT_SYS_NI(setitimer);
166 #endif
167
168 #ifdef CONFIG_COMPAT_32BIT_TIME
169 SYS_NI(timer_settime32);
170 SYS_NI(timer_gettime32);
171
SYSCALL_DEFINE2(clock_settime32,const clockid_t,which_clock,struct old_timespec32 __user *,tp)172 SYSCALL_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
SYSCALL_DEFINE2(clock_gettime32,clockid_t,which_clock,struct old_timespec32 __user *,tp)185 SYSCALL_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
SYSCALL_DEFINE2(clock_getres_time32,clockid_t,which_clock,struct old_timespec32 __user *,tp)200 SYSCALL_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
SYSCALL_DEFINE4(clock_nanosleep_time32,clockid_t,which_clock,int,flags,struct old_timespec32 __user *,rqtp,struct old_timespec32 __user *,rmtp)220 SYSCALL_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
252