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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
16SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
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: {
36 unsigned long arg;
37 if (!ptr)
38 return -EINVAL;
39 if (get_user(arg, (unsigned long __user *) ptr))
40 return -EFAULT;
41 return sys_semctl(first, second, third, arg);
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,
76 second, &raddr, SHMLBA);
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
1// SPDX-License-Identifier: GPL-2.0
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>
9#include <linux/syscalls.h>
10#include <linux/security.h>
11#include <linux/ipc_namespace.h>
12#include "util.h"
13
14#ifdef __ARCH_WANT_SYS_IPC
15#include <linux/errno.h>
16#include <linux/ipc.h>
17#include <linux/shm.h>
18#include <linux/uaccess.h>
19
20SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
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:
30 return ksys_semtimedop(first, (struct sembuf __user *)ptr,
31 second, NULL);
32 case SEMTIMEDOP:
33 return ksys_semtimedop(first, (struct sembuf __user *)ptr,
34 second,
35 (const struct timespec __user *)fifth);
36
37 case SEMGET:
38 return ksys_semget(first, second, third);
39 case SEMCTL: {
40 unsigned long arg;
41 if (!ptr)
42 return -EINVAL;
43 if (get_user(arg, (unsigned long __user *) ptr))
44 return -EFAULT;
45 return ksys_semctl(first, second, third, arg);
46 }
47
48 case MSGSND:
49 return ksys_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 ksys_msgrcv(first, tmp.msgp, second,
63 tmp.msgtyp, third);
64 }
65 default:
66 return ksys_msgrcv(first,
67 (struct msgbuf __user *) ptr,
68 second, fifth, third);
69 }
70 case MSGGET:
71 return ksys_msgget((key_t) first, second);
72 case MSGCTL:
73 return ksys_msgctl(first, second,
74 (struct msqid_ds __user *)ptr);
75
76 case SHMAT:
77 switch (version) {
78 default: {
79 unsigned long raddr;
80 ret = do_shmat(first, (char __user *)ptr,
81 second, &raddr, SHMLBA);
82 if (ret)
83 return ret;
84 return put_user(raddr, (unsigned long __user *) third);
85 }
86 case 1:
87 /*
88 * This was the entry point for kernel-originating calls
89 * from iBCS2 in 2.2 days.
90 */
91 return -EINVAL;
92 }
93 case SHMDT:
94 return ksys_shmdt((char __user *)ptr);
95 case SHMGET:
96 return ksys_shmget(first, second, third);
97 case SHMCTL:
98 return ksys_shmctl(first, second,
99 (struct shmid_ds __user *) ptr);
100 default:
101 return -ENOSYS;
102 }
103}
104#endif
105
106#ifdef CONFIG_COMPAT
107#include <linux/compat.h>
108
109#ifndef COMPAT_SHMLBA
110#define COMPAT_SHMLBA SHMLBA
111#endif
112
113struct compat_ipc_kludge {
114 compat_uptr_t msgp;
115 compat_long_t msgtyp;
116};
117
118#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
119COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
120 u32, third, compat_uptr_t, ptr, u32, fifth)
121{
122 int version;
123 u32 pad;
124
125 version = call >> 16; /* hack for backward compatibility */
126 call &= 0xffff;
127
128 switch (call) {
129 case SEMOP:
130 /* struct sembuf is the same on 32 and 64bit :)) */
131 return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
132 case SEMTIMEDOP:
133 return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
134 compat_ptr(fifth));
135 case SEMGET:
136 return ksys_semget(first, second, third);
137 case SEMCTL:
138 if (!ptr)
139 return -EINVAL;
140 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
141 return -EFAULT;
142 return compat_ksys_semctl(first, second, third, pad);
143
144 case MSGSND:
145 return compat_ksys_msgsnd(first, ptr, second, third);
146
147 case MSGRCV: {
148 void __user *uptr = compat_ptr(ptr);
149
150 if (first < 0 || second < 0)
151 return -EINVAL;
152
153 if (!version) {
154 struct compat_ipc_kludge ipck;
155 if (!uptr)
156 return -EINVAL;
157 if (copy_from_user(&ipck, uptr, sizeof(ipck)))
158 return -EFAULT;
159 return compat_ksys_msgrcv(first, ipck.msgp, second,
160 ipck.msgtyp, third);
161 }
162 return compat_ksys_msgrcv(first, ptr, second, fifth, third);
163 }
164 case MSGGET:
165 return ksys_msgget(first, second);
166 case MSGCTL:
167 return compat_ksys_msgctl(first, second, compat_ptr(ptr));
168
169 case SHMAT: {
170 int err;
171 unsigned long raddr;
172
173 if (version == 1)
174 return -EINVAL;
175 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
176 COMPAT_SHMLBA);
177 if (err < 0)
178 return err;
179 return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
180 }
181 case SHMDT:
182 return ksys_shmdt(compat_ptr(ptr));
183 case SHMGET:
184 return ksys_shmget(first, (unsigned int)second, third);
185 case SHMCTL:
186 return compat_ksys_shmctl(first, second, compat_ptr(ptr));
187 }
188
189 return -ENOSYS;
190}
191#endif
192#endif