blob: 667022746ca56914e77fcb0b9a1c23ff4b02d3d6 [file] [log] [blame]
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -08001/*
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>
Al Viro20bc2a32017-07-09 10:27:22 -04008#include <linux/syscalls.h>
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -08009
10#ifdef __ARCH_WANT_SYS_IPC
11#include <linux/errno.h>
12#include <linux/ipc.h>
13#include <linux/shm.h>
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080014#include <linux/uaccess.h>
15
Anton Blanchard45575f52010-03-22 17:47:59 +110016SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080017 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: {
Al Viroe1fd1f42013-03-05 15:04:55 -050036 unsigned long arg;
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080037 if (!ptr)
38 return -EINVAL;
Al Viroe1fd1f42013-03-05 15:04:55 -050039 if (get_user(arg, (unsigned long __user *) ptr))
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080040 return -EFAULT;
Al Viroe1fd1f42013-03-05 15:04:55 -050041 return sys_semctl(first, second, third, arg);
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080042 }
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,
Will Deacon079a96a2012-07-30 14:42:38 -070076 second, &raddr, SHMLBA);
Christoph Hellwigbaed7fc2010-03-10 15:21:18 -080077 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
Al Viro20bc2a32017-07-09 10:27:22 -0400100
101#ifdef CONFIG_COMPAT
102#include <linux/compat.h>
103
104#ifndef COMPAT_SHMLBA
105#define COMPAT_SHMLBA SHMLBA
106#endif
107
108struct compat_ipc_kludge {
109 compat_uptr_t msgp;
110 compat_long_t msgtyp;
111};
112
113#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
114COMPAT_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