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

// SPDX-License-Identifier: GPL-2.0
/*
 * 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 __user *)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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
baed7fc9 CH	2	/*
	3	* sys_ipc() is the old de-multiplexer for the SysV IPC calls.
	4	*
	5	* This is really horribly ugly, and new architectures should just wire up
	6	* the individual syscalls instead.
	7	*/
	8	#include <linux/unistd.h>
20bc2a3a	9	#include <linux/syscalls.h>
baed7fc9 CH	10
	11	#ifdef __ARCH_WANT_SYS_IPC
	12	#include <linux/errno.h>
	13	#include <linux/ipc.h>
	14	#include <linux/shm.h>
baed7fc9 CH	15	#include <linux/uaccess.h>
baed7fc9 CH	16
45575f5a	17	SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
baed7fc9 CH	18	unsigned long, third, void __user *, ptr, long, fifth)
	19	{
	20	int version, ret;
	21
	22	version = call >> 16; /* hack for backward compatibility */
	23	call &= 0xffff;
	24
	25	switch (call) {
	26	case SEMOP:
	27	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	28	second, NULL);
	29	case SEMTIMEDOP:
	30	return sys_semtimedop(first, (struct sembuf __user *)ptr,
	31	second,
	32	(const struct timespec __user *)fifth);
	33
	34	case SEMGET:
	35	return sys_semget(first, second, third);
	36	case SEMCTL: {
e1fd1f49	37	unsigned long arg;
baed7fc9 CH	38	if (!ptr)
baed7fc9 CH	39	return -EINVAL;
e1fd1f49	40	if (get_user(arg, (unsigned long __user *) ptr))
baed7fc9	41	return -EFAULT;
e1fd1f49	42	return sys_semctl(first, second, third, arg);
baed7fc9 CH	43	}
	44
	45	case MSGSND:
	46	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
	47	second, third);
	48	case MSGRCV:
	49	switch (version) {
	50	case 0: {
	51	struct ipc_kludge tmp;
	52	if (!ptr)
	53	return -EINVAL;
	54
	55	if (copy_from_user(&tmp,
	56	(struct ipc_kludge __user *) ptr,
	57	sizeof(tmp)))
	58	return -EFAULT;
	59	return sys_msgrcv(first, tmp.msgp, second,
	60	tmp.msgtyp, third);
	61	}
	62	default:
	63	return sys_msgrcv(first,
	64	(struct msgbuf __user *) ptr,
	65	second, fifth, third);
	66	}
	67	case MSGGET:
	68	return sys_msgget((key_t) first, second);
	69	case MSGCTL:
	70	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
	71
	72	case SHMAT:
	73	switch (version) {
	74	default: {
	75	unsigned long raddr;
	76	ret = do_shmat(first, (char __user *)ptr,
079a96ae	77	second, &raddr, SHMLBA);
baed7fc9 CH	78	if (ret)
	79	return ret;
	80	return put_user(raddr, (unsigned long __user *) third);
	81	}
	82	case 1:
	83	/*
	84	* This was the entry point for kernel-originating calls
	85	* from iBCS2 in 2.2 days.
	86	*/
	87	return -EINVAL;
	88	}
	89	case SHMDT:
	90	return sys_shmdt((char __user *)ptr);
	91	case SHMGET:
	92	return sys_shmget(first, second, third);
	93	case SHMCTL:
	94	return sys_shmctl(first, second,
	95	(struct shmid_ds __user *) ptr);
	96	default:
	97	return -ENOSYS;
	98	}
	99	}
	100	#endif
20bc2a3a AV	101
	102	#ifdef CONFIG_COMPAT
	103	#include <linux/compat.h>
	104
	105	#ifndef COMPAT_SHMLBA
	106	#define COMPAT_SHMLBA SHMLBA
	107	#endif
	108
	109	struct compat_ipc_kludge {
	110	compat_uptr_t msgp;
	111	compat_long_t msgtyp;
	112	};
	113
	114	#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
	115	COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	116	u32, third, compat_uptr_t, ptr, u32, fifth)
	117	{
	118	int version;
	119	u32 pad;
	120
	121	version = call >> 16; /* hack for backward compatibility */
	122	call &= 0xffff;
	123
	124	switch (call) {
	125	case SEMOP:
	126	/* struct sembuf is the same on 32 and 64bit :)) */
	127	return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
	128	case SEMTIMEDOP:
	129	return compat_sys_semtimedop(first, compat_ptr(ptr), second,
	130	compat_ptr(fifth));
	131	case SEMGET:
	132	return sys_semget(first, second, third);
	133	case SEMCTL:
	134	if (!ptr)
	135	return -EINVAL;
	136	if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
	137	return -EFAULT;
	138	return compat_sys_semctl(first, second, third, pad);
	139
	140	case MSGSND:
	141	return compat_sys_msgsnd(first, ptr, second, third);
	142
	143	case MSGRCV: {
	144	void __user *uptr = compat_ptr(ptr);
	145
	146	if (first < 0 \|\| second < 0)
	147	return -EINVAL;
	148
	149	if (!version) {
	150	struct compat_ipc_kludge ipck;
	151	if (!uptr)
	152	return -EINVAL;
	153	if (copy_from_user(&ipck, uptr, sizeof(ipck)))
	154	return -EFAULT;
	155	return compat_sys_msgrcv(first, ipck.msgp, second,
	156	ipck.msgtyp, third);
	157	}
	158	return compat_sys_msgrcv(first, ptr, second, fifth, third);
	159	}
	160	case MSGGET:
	161	return sys_msgget(first, second);
	162	case MSGCTL:
	163	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	164
165	case SHMAT: {
166	int err;
167	unsigned long raddr;
168
169	if (version == 1)
170	return -EINVAL;
171	err = do_shmat(first, compat_ptr(ptr), second, &raddr,
172	COMPAT_SHMLBA);
173	if (err < 0)
174	return err;
6aa211e8	175	return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
20bc2a3a AV	176	}
	177	case SHMDT:
	178	return sys_shmdt(compat_ptr(ptr));
	179	case SHMGET:
	180	return sys_shmget(first, (unsigned)second, third);
	181	case SHMCTL:
	182	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	183	}
	184
	185	return -ENOSYS;
	186	}
	187	#endif
	188	#endif