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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> |
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, |
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 | |
37 | case SEMGET: | |
38 | return sys_semget(first, second, third); | |
39 | case SEMCTL: { | |
e1fd1f49 | 40 | unsigned long arg; |
baed7fc9 CH |
41 | if (!ptr) |
42 | return -EINVAL; | |
e1fd1f49 | 43 | if (get_user(arg, (unsigned long __user *) ptr)) |
baed7fc9 | 44 | return -EFAULT; |
e1fd1f49 | 45 | return sys_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: | |
71 | return sys_msgget((key_t) first, second); | |
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)); |
134 | case SEMGET: | |
135 | return sys_semget(first, second, third); | |
136 | case SEMCTL: | |
137 | if (!ptr) | |
138 | return -EINVAL; | |
139 | if (get_user(pad, (u32 __user *) compat_ptr(ptr))) | |
140 | return -EFAULT; | |
141 | return compat_sys_semctl(first, second, third, pad); | |
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: | |
164 | return sys_msgget(first, second); | |
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 |