1 // SPDX-License-Identifier: GPL-2.0-or-later
12  * Implementation: user-space maintains a per-thread list of locks it
17  * per-thread. Userspace also maintains a per-thread 'list_op_pending'
24  * sys_set_robust_list() - Set the robust-futex list head of a task
25  * @head:	pointer to the list-head
26  * @len:	length of the list-head, as userspace expects
28 SYSCALL_DEFINE2(set_robust_list, struct robust_list_head __user *, head,  in SYSCALL_DEFINE2()  argument
34 	if (unlikely(len != sizeof(*head)))  in SYSCALL_DEFINE2()
35 		return -EINVAL;  in SYSCALL_DEFINE2()
37 	current->robust_list = head;  in SYSCALL_DEFINE2()
43  * sys_get_robust_list() - Get the robust-futex list head of a task
45  * @head_ptr:	pointer to a list-head pointer, the kernel fills it in
52 	struct robust_list_head __user *head;  in SYSCALL_DEFINE3()  local
58 	ret = -ESRCH;  in SYSCALL_DEFINE3()
67 	ret = -EPERM;  in SYSCALL_DEFINE3()
71 	head = p->robust_list;  in SYSCALL_DEFINE3()
74 	if (put_user(sizeof(*head), len_ptr))  in SYSCALL_DEFINE3()
75 		return -EFAULT;  in SYSCALL_DEFINE3()
76 	return put_user(head, head_ptr);  in SYSCALL_DEFINE3()
94 			return -ENOSYS;  in do_futex()
130 	return -ENOSYS;  in do_futex()
147 futex_init_timeout(u32 cmd, u32 op, struct timespec64 *ts, ktime_t *t)  in futex_init_timeout()  argument
150 		return -EINVAL;  in futex_init_timeout()
152 	*t = timespec64_to_ktime(*ts);  in futex_init_timeout()
154 		*t = ktime_add_safe(ktime_get(), *t);  in futex_init_timeout()
156 		*t = timens_ktime_to_host(CLOCK_MONOTONIC, *t);  in futex_init_timeout()
165 	ktime_t t, *tp = NULL;  in SYSCALL_DEFINE6()  local
170 			return -EFAULT;  in SYSCALL_DEFINE6()
172 			return -EFAULT;  in SYSCALL_DEFINE6()
173 		ret = futex_init_timeout(cmd, op, &ts, &t);  in SYSCALL_DEFINE6()
176 		tp = &t;  in SYSCALL_DEFINE6()
183  * futex_parse_waitv - Parse a waitv array from userspace
204 			return -EFAULT;  in futex_parse_waitv()
207 			return -EINVAL;  in futex_parse_waitv()
211 			return -EINVAL;  in futex_parse_waitv()
214 			return -EINVAL;  in futex_parse_waitv()
244 		return -EINVAL;  in futex2_setup_timeout()
247 		return -EFAULT;  in futex2_setup_timeout()
263 	hrtimer_cancel(&to->timer);  in futex2_destroy_timeout()
264 	destroy_hrtimer_on_stack(&to->timer);  in futex2_destroy_timeout()
268  * sys_futex_waitv - Wait on a list of futexes
300 		return -EINVAL;  in SYSCALL_DEFINE5()
303 		return -EINVAL;  in SYSCALL_DEFINE5()
310 		ret = -ENOMEM;  in SYSCALL_DEFINE5()
328  * sys_futex_wake - Wake a number of futexes
345 		return -EINVAL;  in SYSCALL_DEFINE4()
349 		return -EINVAL;  in SYSCALL_DEFINE4()
352 		return -EINVAL;  in SYSCALL_DEFINE4()
358  * sys_futex_wait - Wait on a futex
382 		return -EINVAL;  in SYSCALL_DEFINE6()
386 		return -EINVAL;  in SYSCALL_DEFINE6()
390 		return -EINVAL;  in SYSCALL_DEFINE6()
404  * sys_futex_requeue - Requeue a waiter from one futex to another
425 		return -EINVAL;  in SYSCALL_DEFINE4()
428 		return -EINVAL;  in SYSCALL_DEFINE4()
443 		struct compat_robust_list_head __user *, head,  in COMPAT_SYSCALL_DEFINE2()  argument
446 	if (unlikely(len != sizeof(*head)))  in COMPAT_SYSCALL_DEFINE2()
447 		return -EINVAL;  in COMPAT_SYSCALL_DEFINE2()
449 	current->compat_robust_list = head;  in COMPAT_SYSCALL_DEFINE2()
458 	struct compat_robust_list_head __user *head;  in COMPAT_SYSCALL_DEFINE3()  local
464 	ret = -ESRCH;  in COMPAT_SYSCALL_DEFINE3()
473 	ret = -EPERM;  in COMPAT_SYSCALL_DEFINE3()
477 	head = p->compat_robust_list;  in COMPAT_SYSCALL_DEFINE3()
480 	if (put_user(sizeof(*head), len_ptr))  in COMPAT_SYSCALL_DEFINE3()
481 		return -EFAULT;  in COMPAT_SYSCALL_DEFINE3()
482 	return put_user(ptr_to_compat(head), head_ptr);  in COMPAT_SYSCALL_DEFINE3()
497 	ktime_t t, *tp = NULL;  in SYSCALL_DEFINE6()  local
502 			return -EFAULT;  in SYSCALL_DEFINE6()
503 		ret = futex_init_timeout(cmd, op, &ts, &t);  in SYSCALL_DEFINE6()
506 		tp = &t;  in SYSCALL_DEFINE6()