[linux-block.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>
#include <linux/security.h>
#include <linux/ipc_namespace.h>
#include "util.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 ksys_semtimedop(first, (struct sembuf __user *)ptr,
				       second, NULL);
	case SEMTIMEDOP:
		return ksys_semtimedop(first, (struct sembuf __user *)ptr,
				       second,
				       (const struct timespec __user *)fifth);

	case SEMGET:
		return ksys_semget(first, second, third);
	case SEMCTL: {
		unsigned long arg;
		if (!ptr)
			return -EINVAL;
		if (get_user(arg, (unsigned long __user *) ptr))
			return -EFAULT;
		return ksys_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 ksys_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 ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
	case SEMTIMEDOP:
		return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
						compat_ptr(fifth));
	case SEMGET:
		return ksys_semget(first, second, third);
	case SEMCTL:
		if (!ptr)
			return -EINVAL;
		if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
			return -EFAULT;
		return compat_ksys_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 ksys_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>
41f4f0e2 DB	10	#include <linux/security.h>
	11	#include <linux/ipc_namespace.h>
	12	#include "util.h"
baed7fc9 CH	13
	14	#ifdef __ARCH_WANT_SYS_IPC
	15	#include <linux/errno.h>
	16	#include <linux/ipc.h>
	17	#include <linux/shm.h>
baed7fc9 CH	18	#include <linux/uaccess.h>
baed7fc9 CH	19
45575f5a	20	SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
baed7fc9 CH	21	unsigned long, third, void __user *, ptr, long, fifth)
	22	{
	23	int version, ret;
	24
	25	version = call >> 16; /* hack for backward compatibility */
	26	call &= 0xffff;
	27
	28	switch (call) {
	29	case SEMOP:
41f4f0e2 DB	30	return ksys_semtimedop(first, (struct sembuf __user *)ptr,
41f4f0e2 DB	31	second, NULL);
baed7fc9	32	case SEMTIMEDOP:
41f4f0e2 DB	33	return ksys_semtimedop(first, (struct sembuf __user *)ptr,
	34	second,
	35	(const struct timespec __user *)fifth);
baed7fc9 CH	36
baed7fc9 CH	37	case SEMGET:
69894718	38	return ksys_semget(first, second, third);
baed7fc9	39	case SEMCTL: {
e1fd1f49	40	unsigned long arg;
baed7fc9 CH	41	if (!ptr)
baed7fc9 CH	42	return -EINVAL;
e1fd1f49	43	if (get_user(arg, (unsigned long __user *) ptr))
baed7fc9	44	return -EFAULT;
d969c6fa	45	return ksys_semctl(first, second, third, arg);
baed7fc9 CH	46	}
	47
	48	case MSGSND:
	49	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
	50	second, third);
	51	case MSGRCV:
	52	switch (version) {
	53	case 0: {
	54	struct ipc_kludge tmp;
	55	if (!ptr)
	56	return -EINVAL;
	57
	58	if (copy_from_user(&tmp,
	59	(struct ipc_kludge __user *) ptr,
	60	sizeof(tmp)))
	61	return -EFAULT;
	62	return sys_msgrcv(first, tmp.msgp, second,
	63	tmp.msgtyp, third);
	64	}
	65	default:
	66	return sys_msgrcv(first,
	67	(struct msgbuf __user *) ptr,
	68	second, fifth, third);
	69	}
	70	case MSGGET:
3d65661a	71	return ksys_msgget((key_t) first, second);
baed7fc9 CH	72	case MSGCTL:
	73	return sys_msgctl(first, second, (struct msqid_ds __user *)ptr);
	74
	75	case SHMAT:
	76	switch (version) {
	77	default: {
	78	unsigned long raddr;
	79	ret = do_shmat(first, (char __user *)ptr,
079a96ae	80	second, &raddr, SHMLBA);
baed7fc9 CH	81	if (ret)
	82	return ret;
	83	return put_user(raddr, (unsigned long __user *) third);
	84	}
	85	case 1:
	86	/*
	87	* This was the entry point for kernel-originating calls
	88	* from iBCS2 in 2.2 days.
	89	*/
	90	return -EINVAL;
	91	}
	92	case SHMDT:
	93	return sys_shmdt((char __user *)ptr);
	94	case SHMGET:
	95	return sys_shmget(first, second, third);
	96	case SHMCTL:
	97	return sys_shmctl(first, second,
	98	(struct shmid_ds __user *) ptr);
	99	default:
	100	return -ENOSYS;
	101	}
	102	}
	103	#endif
20bc2a3a AV	104
	105	#ifdef CONFIG_COMPAT
	106	#include <linux/compat.h>
	107
	108	#ifndef COMPAT_SHMLBA
	109	#define COMPAT_SHMLBA SHMLBA
	110	#endif
	111
	112	struct compat_ipc_kludge {
	113	compat_uptr_t msgp;
	114	compat_long_t msgtyp;
	115	};
	116
	117	#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
	118	COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	119	u32, third, compat_uptr_t, ptr, u32, fifth)
	120	{
	121	int version;
	122	u32 pad;
	123
	124	version = call >> 16; /* hack for backward compatibility */
	125	call &= 0xffff;
	126
	127	switch (call) {
	128	case SEMOP:
	129	/* struct sembuf is the same on 32 and 64bit :)) */
41f4f0e2	130	return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
20bc2a3a	131	case SEMTIMEDOP:
41f4f0e2	132	return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
20bc2a3a AV	133	compat_ptr(fifth));
20bc2a3a AV	134	case SEMGET:
69894718	135	return ksys_semget(first, second, third);
20bc2a3a AV	136	case SEMCTL:
	137	if (!ptr)
	138	return -EINVAL;
	139	if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
	140	return -EFAULT;
d969c6fa	141	return compat_ksys_semctl(first, second, third, pad);
20bc2a3a AV	142
	143	case MSGSND:
	144	return compat_sys_msgsnd(first, ptr, second, third);
	145
	146	case MSGRCV: {
	147	void __user *uptr = compat_ptr(ptr);
	148
	149	if (first < 0 \|\| second < 0)
	150	return -EINVAL;
	151
	152	if (!version) {
	153	struct compat_ipc_kludge ipck;
	154	if (!uptr)
	155	return -EINVAL;
	156	if (copy_from_user(&ipck, uptr, sizeof(ipck)))
	157	return -EFAULT;
	158	return compat_sys_msgrcv(first, ipck.msgp, second,
	159	ipck.msgtyp, third);
	160	}
	161	return compat_sys_msgrcv(first, ptr, second, fifth, third);
	162	}
	163	case MSGGET:
3d65661a	164	return ksys_msgget(first, second);
20bc2a3a AV	165	case MSGCTL:
	166	return compat_sys_msgctl(first, second, compat_ptr(ptr));
	167
	168	case SHMAT: {
	169	int err;
	170	unsigned long raddr;
	171
	172	if (version == 1)
	173	return -EINVAL;
	174	err = do_shmat(first, compat_ptr(ptr), second, &raddr,
	175	COMPAT_SHMLBA);
	176	if (err < 0)
	177	return err;
6aa211e8	178	return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
20bc2a3a AV	179	}
	180	case SHMDT:
	181	return sys_shmdt(compat_ptr(ptr));
	182	case SHMGET:
	183	return sys_shmget(first, (unsigned)second, third);
	184	case SHMCTL:
	185	return compat_sys_shmctl(first, second, compat_ptr(ptr));
	186	}
	187
	188	return -ENOSYS;
	189	}
	190	#endif
	191	#endif