[linux-2.6-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:
		if (IS_ENABLED(CONFIG_64BIT) || !IS_ENABLED(CONFIG_64BIT_TIME))
			return ksys_semtimedop(first, ptr, second,
			        (const struct __kernel_timespec __user *)fifth);
		else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
			return compat_ksys_semtimedop(first, ptr, second,
			        (const struct old_timespec32 __user *)fifth);
		else
			return -ENOSYS;

	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 ksys_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 ksys_msgrcv(first, tmp.msgp, second,
					   tmp.msgtyp, third);
		}
		default:
			return ksys_msgrcv(first,
					   (struct msgbuf __user *) ptr,
					   second, fifth, third);
		}
	case MSGGET:
		return ksys_msgget((key_t) first, second);
	case MSGCTL:
		return ksys_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 ksys_shmdt((char __user *)ptr);
	case SHMGET:
		return ksys_shmget(first, second, third);
	case SHMCTL:
		return ksys_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:
		if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
			return -ENOSYS;
		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_ksys_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_ksys_msgrcv(first, ipck.msgp, second,
						 ipck.msgtyp, third);
		}
		return compat_ksys_msgrcv(first, ptr, second, fifth, third);
	}
	case MSGGET:
		return ksys_msgget(first, second);
	case MSGCTL:
		return compat_ksys_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 ksys_shmdt(compat_ptr(ptr));
	case SHMGET:
		return ksys_shmget(first, (unsigned int)second, third);
	case SHMCTL:
		return compat_ksys_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:
5dc0b152 AB	33	if (IS_ENABLED(CONFIG_64BIT) \|\| !IS_ENABLED(CONFIG_64BIT_TIME))
	34	return ksys_semtimedop(first, ptr, second,
	35	(const struct __kernel_timespec __user *)fifth);
	36	else if (IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
	37	return compat_ksys_semtimedop(first, ptr, second,
9afc5eee	38	(const struct old_timespec32 __user *)fifth);
5dc0b152 AB	39	else
5dc0b152 AB	40	return -ENOSYS;
baed7fc9 CH	41
baed7fc9 CH	42	case SEMGET:
69894718	43	return ksys_semget(first, second, third);
baed7fc9	44	case SEMCTL: {
e1fd1f49	45	unsigned long arg;
baed7fc9 CH	46	if (!ptr)
baed7fc9 CH	47	return -EINVAL;
e1fd1f49	48	if (get_user(arg, (unsigned long __user *) ptr))
baed7fc9	49	return -EFAULT;
d969c6fa	50	return ksys_semctl(first, second, third, arg);
baed7fc9 CH	51	}
	52
	53	case MSGSND:
31c213f2	54	return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
baed7fc9 CH	55	second, third);
	56	case MSGRCV:
	57	switch (version) {
	58	case 0: {
	59	struct ipc_kludge tmp;
	60	if (!ptr)
	61	return -EINVAL;
	62
	63	if (copy_from_user(&tmp,
	64	(struct ipc_kludge __user *) ptr,
	65	sizeof(tmp)))
	66	return -EFAULT;
078faac9	67	return ksys_msgrcv(first, tmp.msgp, second,
baed7fc9 CH	68	tmp.msgtyp, third);
	69	}
	70	default:
078faac9	71	return ksys_msgrcv(first,
baed7fc9 CH	72	(struct msgbuf __user *) ptr,
	73	second, fifth, third);
	74	}
	75	case MSGGET:
3d65661a	76	return ksys_msgget((key_t) first, second);
baed7fc9	77	case MSGCTL:
e340db56 DB	78	return ksys_msgctl(first, second,
e340db56 DB	79	(struct msqid_ds __user *)ptr);
baed7fc9 CH	80
	81	case SHMAT:
	82	switch (version) {
	83	default: {
	84	unsigned long raddr;
	85	ret = do_shmat(first, (char __user *)ptr,
079a96ae	86	second, &raddr, SHMLBA);
baed7fc9 CH	87	if (ret)
	88	return ret;
	89	return put_user(raddr, (unsigned long __user *) third);
	90	}
	91	case 1:
	92	/*
	93	* This was the entry point for kernel-originating calls
	94	* from iBCS2 in 2.2 days.
	95	*/
	96	return -EINVAL;
	97	}
	98	case SHMDT:
da1e2744	99	return ksys_shmdt((char __user *)ptr);
baed7fc9	100	case SHMGET:
65749e0b	101	return ksys_shmget(first, second, third);
baed7fc9	102	case SHMCTL:
c84d0791	103	return ksys_shmctl(first, second,
baed7fc9 CH	104	(struct shmid_ds __user *) ptr);
	105	default:
	106	return -ENOSYS;
	107	}
	108	}
	109	#endif
20bc2a3a AV	110
	111	#ifdef CONFIG_COMPAT
	112	#include <linux/compat.h>
	113
	114	#ifndef COMPAT_SHMLBA
	115	#define COMPAT_SHMLBA SHMLBA
	116	#endif
	117
	118	struct compat_ipc_kludge {
	119	compat_uptr_t msgp;
	120	compat_long_t msgtyp;
	121	};
	122
	123	#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
	124	COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
	125	u32, third, compat_uptr_t, ptr, u32, fifth)
	126	{
	127	int version;
	128	u32 pad;
	129
	130	version = call >> 16; /* hack for backward compatibility */
	131	call &= 0xffff;
	132
	133	switch (call) {
	134	case SEMOP:
	135	/* struct sembuf is the same on 32 and 64bit :)) */
41f4f0e2	136	return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
20bc2a3a	137	case SEMTIMEDOP:
5dc0b152 AB	138	if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
5dc0b152 AB	139	return -ENOSYS;
41f4f0e2	140	return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
20bc2a3a AV	141	compat_ptr(fifth));
20bc2a3a AV	142	case SEMGET:
69894718	143	return ksys_semget(first, second, third);
20bc2a3a AV	144	case SEMCTL:
	145	if (!ptr)
	146	return -EINVAL;
	147	if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
	148	return -EFAULT;
d969c6fa	149	return compat_ksys_semctl(first, second, third, pad);
20bc2a3a AV	150
20bc2a3a AV	151	case MSGSND:
31c213f2	152	return compat_ksys_msgsnd(first, ptr, second, third);
20bc2a3a AV	153
	154	case MSGRCV: {
	155	void __user *uptr = compat_ptr(ptr);
	156
	157	if (first < 0 \|\| second < 0)
	158	return -EINVAL;
	159
	160	if (!version) {
	161	struct compat_ipc_kludge ipck;
	162	if (!uptr)
	163	return -EINVAL;
	164	if (copy_from_user(&ipck, uptr, sizeof(ipck)))
	165	return -EFAULT;
078faac9	166	return compat_ksys_msgrcv(first, ipck.msgp, second,
20bc2a3a AV	167	ipck.msgtyp, third);
20bc2a3a AV	168	}
078faac9	169	return compat_ksys_msgrcv(first, ptr, second, fifth, third);
20bc2a3a AV	170	}
20bc2a3a AV	171	case MSGGET:
3d65661a	172	return ksys_msgget(first, second);
20bc2a3a	173	case MSGCTL:
e340db56	174	return compat_ksys_msgctl(first, second, compat_ptr(ptr));
20bc2a3a AV	175
	176	case SHMAT: {
	177	int err;
	178	unsigned long raddr;
	179
	180	if (version == 1)
	181	return -EINVAL;
	182	err = do_shmat(first, compat_ptr(ptr), second, &raddr,
	183	COMPAT_SHMLBA);
	184	if (err < 0)
	185	return err;
6aa211e8	186	return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
20bc2a3a AV	187	}
20bc2a3a AV	188	case SHMDT:
da1e2744	189	return ksys_shmdt(compat_ptr(ptr));
20bc2a3a	190	case SHMGET:
65749e0b	191	return ksys_shmget(first, (unsigned int)second, third);
20bc2a3a	192	case SHMCTL:
c84d0791	193	return compat_ksys_shmctl(first, second, compat_ptr(ptr));
20bc2a3a AV	194	}
	195
	196	return -ENOSYS;
	197	}
	198	#endif
	199	#endif