[mirror_ubuntu-bionic-kernel.git] / ipc / syscall.c

/*
 * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
 *
 * This is really horribly ugly, and new architectures should just wire up
 * the individual syscalls instead.
 */
#include <linux/unistd.h>

#ifdef __ARCH_WANT_SYS_IPC
#include <linux/errno.h>
#include <linux/ipc.h>
#include <linux/shm.h>
#include <linux/syscalls.h>
#include <linux/uaccess.h>

SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
		unsigned long, third, void __user *, ptr, long, fifth)
{
	int version, ret;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	switch (call) {
	case SEMOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				      second, NULL);
	case SEMTIMEDOP:
		return sys_semtimedop(first, (struct sembuf __user *)ptr,
				      second,
				      (const struct timespec __user *)fifth);

	case SEMGET:
		return sys_semget(first, second, third);
	case SEMCTL: {
		unsigned long arg;
		if (!ptr)
			return -EINVAL;
		if (get_user(arg, (unsigned long __user *) ptr))
			return -EFAULT;
		return sys_semctl(first, second, third, arg);
	}

	case MSGSND:
		return sys_msgsnd(first, (struct msgbuf __user *) ptr,
				  second, third);
	case MSGRCV:
		switch (version) {
		case 0: {
			struct ipc_kludge tmp;
			if (!ptr)
				return -EINVAL;

			if (copy_from_user(&tmp,
					   (struct ipc_kludge __user *) ptr,
					   sizeof(tmp)))
				return -EFAULT;
			return sys_msgrcv(first, tmp.msgp, second,
					   tmp.msgtyp, third);
		}
		default:
			return sys_msgrcv(first,
					   (struct msgbuf __user *) ptr,
					   second, fifth, third);
		}
	case MSGGET:
		return sys_msgget((key_t) first, second);
	case MSGCTL:
		return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);

	case SHMAT:
		switch (version) {
		default: {
			unsigned long raddr;
			ret = do_shmat(first, (char __user *)ptr,
				       second, &raddr, SHMLBA);
			if (ret)
				return ret;
			return put_user(raddr, (unsigned long __user *) third);
		}
		case 1:
			/*
			 * This was the entry point for kernel-originating calls
			 * from iBCS2 in 2.2 days.
			 */
			return -EINVAL;
		}
	case SHMDT:
		return sys_shmdt((char __user *)ptr);
	case SHMGET:
		return sys_shmget(first, second, third);
	case SHMCTL:
		return sys_shmctl(first, second,
				   (struct shmid_ds __user *) ptr);
	default:
		return -ENOSYS;
	}
}
#endif
Commit	Line	Data
baed7fc9 CH	1	/*
	2	* sys_ipc() is the old de-multiplexer for the SysV IPC calls.
	3	*
	4	* This is really horribly ugly, and new architectures should just wire up
	5	* the individual syscalls instead.
	6	*/
	7	#include <linux/unistd.h>
	8
	9	#ifdef __ARCH_WANT_SYS_IPC
	10	#include <linux/errno.h>
	11	#include <linux/ipc.h>
	12	#include <linux/shm.h>
	13	#include <linux/syscalls.h>
	14	#include <linux/uaccess.h>
	15
45575f5a	16	SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
baed7fc9 CH	17	unsigned long, third, void __user *, ptr, long, fifth)
	18	{
	19	int version, ret;
	20
	21	version = call >> 16; /* hack for backward compatibility */
	22	call &= 0xffff;
	23
	24	switch (call) {
	25	case SEMOP:
	26	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	27	second, NULL);
	28	case SEMTIMEDOP:
	29	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	30	second,
	31	(const struct timespec __user *)fifth);
	32
	33	case SEMGET:
	34	return sys_semget(first, second, third);
	35	case SEMCTL: {
e1fd1f49	36	unsigned long arg;
baed7fc9 CH	37	if (!ptr)
baed7fc9 CH	38	return -EINVAL;
e1fd1f49	39	if (get_user(arg, (unsigned long __user *) ptr))
baed7fc9	40	return -EFAULT;
e1fd1f49	41	return sys_semctl(first, second, third, arg);
baed7fc9 CH	42	}
	43
	44	case MSGSND:
	45	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
	46	second, third);
	47	case MSGRCV:
	48	switch (version) {
	49	case 0: {
	50	struct ipc_kludge tmp;
	51	if (!ptr)
	52	return -EINVAL;
	53
	54	if (copy_from_user(&tmp,
	55	(struct ipc_kludge __user *) ptr,
	56	sizeof(tmp)))
	57	return -EFAULT;
	58	return sys_msgrcv(first, tmp.msgp, second,
	59	tmp.msgtyp, third);
	60	}
	61	default:
	62	return sys_msgrcv(first,
	63	(struct msgbuf __user *) ptr,
	64	second, fifth, third);
	65	}
	66	case MSGGET:
	67	return sys_msgget((key_t) first, second);
	68	case MSGCTL:
	69	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
	70
	71	case SHMAT:
	72	switch (version) {
	73	default: {
	74	unsigned long raddr;
	75	ret = do_shmat(first, (char __user *)ptr,
079a96ae	76	second, &raddr, SHMLBA);
baed7fc9 CH	77	if (ret)
	78	return ret;
	79	return put_user(raddr, (unsigned long __user *) third);
	80	}
	81	case 1:
	82	/*
	83	* This was the entry point for kernel-originating calls
	84	* from iBCS2 in 2.2 days.
	85	*/
	86	return -EINVAL;
	87	}
	88	case SHMDT:
	89	return sys_shmdt((char __user *)ptr);
	90	case SHMGET:
	91	return sys_shmget(first, second, third);
	92	case SHMCTL:
	93	return sys_shmctl(first, second,
	94	(struct shmid_ds __user *) ptr);
	95	default:
	96	return -ENOSYS;
	97	}
	98	}
	99	#endif