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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: | |
69894718 | 38 | return ksys_semget(first, second, third); |
baed7fc9 | 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; |
d969c6fa | 45 | return ksys_semctl(first, second, third, arg); |
baed7fc9 CH |
46 | } |
47 | ||
48 | case MSGSND: | |
31c213f2 | 49 | return ksys_msgsnd(first, (struct msgbuf __user *) ptr, |
baed7fc9 CH |
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; | |
078faac9 | 62 | return ksys_msgrcv(first, tmp.msgp, second, |
baed7fc9 CH |
63 | tmp.msgtyp, third); |
64 | } | |
65 | default: | |
078faac9 | 66 | return ksys_msgrcv(first, |
baed7fc9 CH |
67 | (struct msgbuf __user *) ptr, |
68 | second, fifth, third); | |
69 | } | |
70 | case MSGGET: | |
3d65661a | 71 | return ksys_msgget((key_t) first, second); |
baed7fc9 | 72 | case MSGCTL: |
e340db56 DB |
73 | return ksys_msgctl(first, second, |
74 | (struct msqid_ds __user *)ptr); | |
baed7fc9 CH |
75 | |
76 | case SHMAT: | |
77 | switch (version) { | |
78 | default: { | |
79 | unsigned long raddr; | |
80 | ret = do_shmat(first, (char __user *)ptr, | |
079a96ae | 81 | second, &raddr, SHMLBA); |
baed7fc9 CH |
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: | |
da1e2744 | 94 | return ksys_shmdt((char __user *)ptr); |
baed7fc9 | 95 | case SHMGET: |
65749e0b | 96 | return ksys_shmget(first, second, third); |
baed7fc9 | 97 | case SHMCTL: |
c84d0791 | 98 | return ksys_shmctl(first, second, |
baed7fc9 CH |
99 | (struct shmid_ds __user *) ptr); |
100 | default: | |
101 | return -ENOSYS; | |
102 | } | |
103 | } | |
104 | #endif | |
20bc2a3a AV |
105 | |
106 | #ifdef CONFIG_COMPAT | |
107 | #include <linux/compat.h> | |
108 | ||
109 | #ifndef COMPAT_SHMLBA | |
110 | #define COMPAT_SHMLBA SHMLBA | |
111 | #endif | |
112 | ||
113 | struct compat_ipc_kludge { | |
114 | compat_uptr_t msgp; | |
115 | compat_long_t msgtyp; | |
116 | }; | |
117 | ||
118 | #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC | |
119 | COMPAT_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 :)) */ | |
41f4f0e2 | 131 | return ksys_semtimedop(first, compat_ptr(ptr), second, NULL); |
20bc2a3a | 132 | case SEMTIMEDOP: |
41f4f0e2 | 133 | return compat_ksys_semtimedop(first, compat_ptr(ptr), second, |
20bc2a3a AV |
134 | compat_ptr(fifth)); |
135 | case SEMGET: | |
69894718 | 136 | return ksys_semget(first, second, third); |
20bc2a3a AV |
137 | case SEMCTL: |
138 | if (!ptr) | |
139 | return -EINVAL; | |
140 | if (get_user(pad, (u32 __user *) compat_ptr(ptr))) | |
141 | return -EFAULT; | |
d969c6fa | 142 | return compat_ksys_semctl(first, second, third, pad); |
20bc2a3a AV |
143 | |
144 | case MSGSND: | |
31c213f2 | 145 | return compat_ksys_msgsnd(first, ptr, second, third); |
20bc2a3a AV |
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; | |
078faac9 | 159 | return compat_ksys_msgrcv(first, ipck.msgp, second, |
20bc2a3a AV |
160 | ipck.msgtyp, third); |
161 | } | |
078faac9 | 162 | return compat_ksys_msgrcv(first, ptr, second, fifth, third); |
20bc2a3a AV |
163 | } |
164 | case MSGGET: | |
3d65661a | 165 | return ksys_msgget(first, second); |
20bc2a3a | 166 | case MSGCTL: |
e340db56 | 167 | return compat_ksys_msgctl(first, second, compat_ptr(ptr)); |
20bc2a3a AV |
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; | |
6aa211e8 | 179 | return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third)); |
20bc2a3a AV |
180 | } |
181 | case SHMDT: | |
da1e2744 | 182 | return ksys_shmdt(compat_ptr(ptr)); |
20bc2a3a | 183 | case SHMGET: |
65749e0b | 184 | return ksys_shmget(first, (unsigned int)second, third); |
20bc2a3a | 185 | case SHMCTL: |
c84d0791 | 186 | return compat_ksys_shmctl(first, second, compat_ptr(ptr)); |
20bc2a3a AV |
187 | } |
188 | ||
189 | return -ENOSYS; | |
190 | } | |
191 | #endif | |
192 | #endif |