[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>
#include <linux/syscalls.h>

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

#ifdef CONFIG_COMPAT
#include <linux/compat.h>

#ifndef COMPAT_SHMLBA
#define COMPAT_SHMLBA	SHMLBA
#endif

struct compat_ipc_kludge {
	compat_uptr_t msgp;
	compat_long_t msgtyp;
};

#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	u32, third, compat_uptr_t, ptr, u32, fifth)
{
	int version;
	u32 pad;

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

	switch (call) {
	case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
	case SEMTIMEDOP:
		return compat_sys_semtimedop(first, compat_ptr(ptr), second,
						compat_ptr(fifth));
	case SEMGET:
		return sys_semget(first, second, third);
	case SEMCTL:
		if (!ptr)
			return -EINVAL;
		if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
			return -EFAULT;
		return compat_sys_semctl(first, second, third, pad);

	case MSGSND:
		return compat_sys_msgsnd(first, ptr, second, third);

	case MSGRCV: {
		void __user *uptr = compat_ptr(ptr);

		if (first < 0 || second < 0)
			return -EINVAL;

		if (!version) {
			struct compat_ipc_kludge ipck;
			if (!uptr)
				return -EINVAL;
			if (copy_from_user(&ipck, uptr, sizeof(ipck)))
				return -EFAULT;
			return compat_sys_msgrcv(first, ipck.msgp, second,
						 ipck.msgtyp, third);
		}
		return compat_sys_msgrcv(first, ptr, second, fifth, third);
	}
	case MSGGET:
		return sys_msgget(first, second);
	case MSGCTL:
		return compat_sys_msgctl(first, second, compat_ptr(ptr));

	case SHMAT: {
		int err;
		unsigned long raddr;

		if (version == 1)
			return -EINVAL;
		err = do_shmat(first, compat_ptr(ptr), second, &raddr,
			       COMPAT_SHMLBA);
		if (err < 0)
			return err;
		return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
	}
	case SHMDT:
		return sys_shmdt(compat_ptr(ptr));
	case SHMGET:
		return sys_shmget(first, (unsigned)second, third);
	case SHMCTL:
		return compat_sys_shmctl(first, second, compat_ptr(ptr));
	}

	return -ENOSYS;
}
#endif
#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>
20bc2a3a	8	#include <linux/syscalls.h>
baed7fc9 CH	9
	10	#ifdef __ARCH_WANT_SYS_IPC
	11	#include <linux/errno.h>
	12	#include <linux/ipc.h>
	13	#include <linux/shm.h>
baed7fc9 CH	14	#include <linux/uaccess.h>
baed7fc9 CH	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
20bc2a3a AV	100
	101	#ifdef CONFIG_COMPAT
	102	#include <linux/compat.h>
	103
	104	#ifndef COMPAT_SHMLBA
	105	#define COMPAT_SHMLBA SHMLBA
	106	#endif
	107
	108	struct compat_ipc_kludge {
	109	compat_uptr_t msgp;
	110	compat_long_t msgtyp;
	111	};
	112
	113	#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
	114	COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	115	u32, third, compat_uptr_t, ptr, u32, fifth)
	116	{
	117	int version;
	118	u32 pad;
	119
	120	version = call >> 16; /* hack for backward compatibility */
	121	call &= 0xffff;
	122
	123	switch (call) {
	124	case SEMOP:
	125	/* struct sembuf is the same on 32 and 64bit :)) */
	126	return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
	127	case SEMTIMEDOP:
	128	return compat_sys_semtimedop(first, compat_ptr(ptr), second,
	129	compat_ptr(fifth));
	130	case SEMGET:
	131	return sys_semget(first, second, third);
	132	case SEMCTL:
	133	if (!ptr)
	134	return -EINVAL;
	135	if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
	136	return -EFAULT;
	137	return compat_sys_semctl(first, second, third, pad);
	138
	139	case MSGSND:
	140	return compat_sys_msgsnd(first, ptr, second, third);
	141
	142	case MSGRCV: {
	143	void __user *uptr = compat_ptr(ptr);
	144
	145	if (first < 0 \|\| second < 0)
	146	return -EINVAL;
	147
	148	if (!version) {
	149	struct compat_ipc_kludge ipck;
	150	if (!uptr)
	151	return -EINVAL;
	152	if (copy_from_user(&ipck, uptr, sizeof(ipck)))
	153	return -EFAULT;
	154	return compat_sys_msgrcv(first, ipck.msgp, second,
	155	ipck.msgtyp, third);
	156	}
	157	return compat_sys_msgrcv(first, ptr, second, fifth, third);
	158	}
	159	case MSGGET:
	160	return sys_msgget(first, second);
	161	case MSGCTL:
	162	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	163
164	case SHMAT: {
165	int err;
166	unsigned long raddr;
167
168	if (version == 1)
169	return -EINVAL;
170	err = do_shmat(first, compat_ptr(ptr), second, &raddr,
171	COMPAT_SHMLBA);
172	if (err < 0)
173	return err;
174	return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
175	}
176	case SHMDT:
177	return sys_shmdt(compat_ptr(ptr));
178	case SHMGET:
179	return sys_shmget(first, (unsigned)second, third);
180	case SHMCTL:
181	return compat_sys_shmctl(first, second, compat_ptr(ptr));
182	}
183
184	return -ENOSYS;
185	}
186	#endif
187	#endif