1 // SPDX-License-Identifier: GPL-2.0
3 * sys_ipc() is the old de-multiplexer for the SysV IPC calls.
5 * This is really horribly ugly, and new architectures should just wire up
6 * the individual syscalls instead.
8 #include <linux/unistd.h>
9 #include <linux/syscalls.h>
10 #include <linux/security.h>
11 #include <linux/ipc_namespace.h>
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>
20 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
21 unsigned long, third, void __user *, ptr, long, fifth)
25 version = call >> 16; /* hack for backward compatibility */
30 return ksys_semtimedop(first, (struct sembuf __user *)ptr,
33 return ksys_semtimedop(first, (struct sembuf __user *)ptr,
35 (const struct timespec __user *)fifth);
38 return ksys_semget(first, second, third);
43 if (get_user(arg, (unsigned long __user *) ptr))
45 return ksys_semctl(first, second, third, arg);
49 return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
54 struct ipc_kludge tmp;
58 if (copy_from_user(&tmp,
59 (struct ipc_kludge __user *) ptr,
62 return ksys_msgrcv(first, tmp.msgp, second,
66 return ksys_msgrcv(first,
67 (struct msgbuf __user *) ptr,
68 second, fifth, third);
71 return ksys_msgget((key_t) first, second);
73 return ksys_msgctl(first, second,
74 (struct msqid_ds __user *)ptr);
80 ret = do_shmat(first, (char __user *)ptr,
81 second, &raddr, SHMLBA);
84 return put_user(raddr, (unsigned long __user *) third);
88 * This was the entry point for kernel-originating calls
89 * from iBCS2 in 2.2 days.
94 return ksys_shmdt((char __user *)ptr);
96 return ksys_shmget(first, second, third);
98 return ksys_shmctl(first, second,
99 (struct shmid_ds __user *) ptr);
107 #include <linux/compat.h>
109 #ifndef COMPAT_SHMLBA
110 #define COMPAT_SHMLBA SHMLBA
113 struct compat_ipc_kludge {
115 compat_long_t msgtyp;
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)
125 version = call >> 16; /* hack for backward compatibility */
130 /* struct sembuf is the same on 32 and 64bit :)) */
131 return ksys_semtimedop(first, compat_ptr(ptr), second, NULL);
133 return compat_ksys_semtimedop(first, compat_ptr(ptr), second,
136 return ksys_semget(first, second, third);
140 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
142 return compat_ksys_semctl(first, second, third, pad);
145 return compat_ksys_msgsnd(first, ptr, second, third);
148 void __user *uptr = compat_ptr(ptr);
150 if (first < 0 || second < 0)
154 struct compat_ipc_kludge ipck;
157 if (copy_from_user(&ipck, uptr, sizeof(ipck)))
159 return compat_ksys_msgrcv(first, ipck.msgp, second,
162 return compat_ksys_msgrcv(first, ptr, second, fifth, third);
165 return ksys_msgget(first, second);
167 return compat_ksys_msgctl(first, second, compat_ptr(ptr));
175 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
179 return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third));
182 return ksys_shmdt(compat_ptr(ptr));
184 return ksys_shmget(first, (unsigned int)second, third);
186 return compat_ksys_shmctl(first, second, compat_ptr(ptr));