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 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 return ksys_semtimedop(first, (struct sembuf __user *)ptr, 34 second, 35 (const struct timespec __user *)fifth); 36 37 case SEMGET: 38 return ksys_semget(first, second, third); 39 case SEMCTL: { 40 unsigned long arg; 41 if (!ptr) 42 return -EINVAL; 43 if (get_user(arg, (unsigned long __user *) ptr)) 44 return -EFAULT; 45 return ksys_semctl(first, second, third, arg); 46 } 47 48 case MSGSND: 49 return ksys_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 ksys_msgrcv(first, tmp.msgp, second, 63 tmp.msgtyp, third); 64 } 65 default: 66 return ksys_msgrcv(first, 67 (struct msgbuf __user *) ptr, 68 second, fifth, third); 69 } 70 case MSGGET: 71 return ksys_msgget((key_t) first, second); 72 case MSGCTL: 73 return ksys_msgctl(first, second, 74 (struct msqid_ds __user *)ptr); 75 76 case SHMAT: 77 switch (version) { 78 default: { 79 unsigned long raddr; 80 ret = do_shmat(first, (char __user *)ptr, 81 second, &raddr, SHMLBA); 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: 94 return ksys_shmdt((char __user *)ptr); 95 case SHMGET: 96 return ksys_shmget(first, second, third); 97 case SHMCTL: 98 return ksys_shmctl(first, second, 99 (struct shmid_ds __user *) ptr); 100 default: 101 return -ENOSYS; 102 } 103 } 104 #endif 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 :)) */ 131 return ksys_semtimedop(first, compat_ptr(ptr), second, NULL); 132 case SEMTIMEDOP: 133 return compat_ksys_semtimedop(first, compat_ptr(ptr), second, 134 compat_ptr(fifth)); 135 case SEMGET: 136 return ksys_semget(first, second, third); 137 case SEMCTL: 138 if (!ptr) 139 return -EINVAL; 140 if (get_user(pad, (u32 __user *) compat_ptr(ptr))) 141 return -EFAULT; 142 return compat_ksys_semctl(first, second, third, pad); 143 144 case MSGSND: 145 return compat_ksys_msgsnd(first, ptr, second, third); 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; 159 return compat_ksys_msgrcv(first, ipck.msgp, second, 160 ipck.msgtyp, third); 161 } 162 return compat_ksys_msgrcv(first, ptr, second, fifth, third); 163 } 164 case MSGGET: 165 return ksys_msgget(first, second); 166 case MSGCTL: 167 return compat_ksys_msgctl(first, second, compat_ptr(ptr)); 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; 179 return put_user(raddr, (compat_ulong_t __user *)compat_ptr(third)); 180 } 181 case SHMDT: 182 return ksys_shmdt(compat_ptr(ptr)); 183 case SHMGET: 184 return ksys_shmget(first, (unsigned int)second, third); 185 case SHMCTL: 186 return compat_ksys_shmctl(first, second, compat_ptr(ptr)); 187 } 188 189 return -ENOSYS; 190 } 191 #endif 192 #endif 193