1 /* 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> 8 #include <linux/syscalls.h> 9 10 #ifdef __ARCH_WANT_SYS_IPC 11 #include <linux/errno.h> 12 #include <linux/ipc.h> 13 #include <linux/shm.h> 14 #include <linux/uaccess.h> 15 16 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, 17 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: { 36 unsigned long arg; 37 if (!ptr) 38 return -EINVAL; 39 if (get_user(arg, (unsigned long __user *) ptr)) 40 return -EFAULT; 41 return sys_semctl(first, second, third, arg); 42 } 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, 76 second, &raddr, SHMLBA); 77 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 100 101 #ifdef CONFIG_COMPAT 102 #include <linux/compat.h> 103 104 #ifndef COMPAT_SHMLBA 105 #define COMPAT_SHMLBA SHMLBA 106 #endif 107 108 struct compat_ipc_kludge { 109 compat_uptr_t msgp; 110 compat_long_t msgtyp; 111 }; 112 113 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC 114 COMPAT_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 188