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| 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 | |
| 9 | #ifdef __ARCH_WANT_SYS_IPC |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/ipc.h> |
| 12 | #include <linux/shm.h> |
| 13 | #include <linux/syscalls.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 | union semun fourth; |
| 37 | if (!ptr) |
| 38 | return -EINVAL; |
| 39 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) |
| 40 | return -EFAULT; |
| 41 | return sys_semctl(first, second, third, fourth); |
| 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); |
| 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 |
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v2.6.34-rc5
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