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
SYSCALL_DEFINE6(ipc,unsigned int,call,int,first,unsigned long,second,unsigned long,third,void __user *,ptr,long,fifth)20 SYSCALL_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 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,
38 (const struct compat_timespec __user *)fifth);
39 else
40 return -ENOSYS;
41
42 case SEMGET:
43 return ksys_semget(first, second, third);
44 case SEMCTL: {
45 unsigned long arg;
46 if (!ptr)
47 return -EINVAL;
48 if (get_user(arg, (unsigned long __user *) ptr))
49 return -EFAULT;
50 return ksys_semctl(first, second, third, arg);
51 }
52
53 case MSGSND:
54 return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
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;
67 return ksys_msgrcv(first, tmp.msgp, second,
68 tmp.msgtyp, third);
69 }
70 default:
71 return ksys_msgrcv(first,
72 (struct msgbuf __user *) ptr,
73 second, fifth, third);
74 }
75 case MSGGET:
76 return ksys_msgget((key_t) first, second);
77 case MSGCTL:
78 return ksys_msgctl(first, second,
79 (struct msqid_ds __user *)ptr);
80
81 case SHMAT:
82 switch (version) {
83 default: {
84 unsigned long raddr;
85 ret = do_shmat(first, (char __user *)ptr,
86 second, &raddr, SHMLBA);
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:
99 return ksys_shmdt((char __user *)ptr);
100 case SHMGET:
101 return ksys_shmget(first, second, third);
102 case SHMCTL:
103 return ksys_shmctl(first, second,
104 (struct shmid_ds __user *) ptr);
105 default:
106 return -ENOSYS;
107 }
108 }
109 #endif
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
COMPAT_SYSCALL_DEFINE6(ipc,u32,call,int,first,int,second,u32,third,compat_uptr_t,ptr,u32,fifth)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 :)) */
136 return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
137 case SEMTIMEDOP:
138 if (!IS_ENABLED(CONFIG_COMPAT_32BIT_TIME))
139 return -ENOSYS;
140 return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
141 compat_ptr(fifth));
142 case SEMGET:
143 return ksys_semget(first, second, third);
144 case SEMCTL:
145 if (!ptr)
146 return -EINVAL;
147 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
148 return -EFAULT;
149 return compat_ksys_semctl(first, second, third, pad);
150
151 case MSGSND:
152 return compat_ksys_msgsnd(first, ptr, second, third);
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;
166 return compat_ksys_msgrcv(first, ipck.msgp, second,
167 ipck.msgtyp, third);
168 }
169 return compat_ksys_msgrcv(first, ptr, second, fifth, third);
170 }
171 case MSGGET:
172 return ksys_msgget(first, second);
173 case MSGCTL:
174 return compat_ksys_msgctl(first, second, compat_ptr(ptr));
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;
186 return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
187 }
188 case SHMDT:
189 return ksys_shmdt(compat_ptr(ptr));
190 case SHMGET:
191 return ksys_shmget(first, (unsigned int)second, third);
192 case SHMCTL:
193 return compat_ksys_shmctl(first, second, compat_ptr(ptr));
194 }
195
196 return -ENOSYS;
197 }
198 #endif
199 #endif
200
