ipc/compat.c

   1 /*
   2  * 32 bit compatibility code for System V IPC
   3  *
   4  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   7  * Copyright (C) 2000           VA Linux Co
   8  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   9  * Copyright (C) 2000           Hewlett-Packard Co.
  10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  11  * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
  12  * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
  13  * Copyright (C) 2000           Silicon Graphics, Inc.
  14  * Copyright (C) 2001           IBM
  15  * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
  16  * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
  17  *
  18  * This code is collected from the versions for sparc64, mips64, s390x, ia64,
  19  * ppc64 and x86_64, all of which are based on the original sparc64 version
  20  * by Jakub Jelinek.
  21  *
  22  */
  23 #include <linux/compat.h>
  24 #include <linux/errno.h>
  25 #include <linux/highuid.h>
  26 #include <linux/init.h>
  27 #include <linux/msg.h>
  28 #include <linux/shm.h>
  29 #include <linux/syscalls.h>
  30 #include <linux/ptrace.h>
  31
  32 #include <linux/mutex.h>
  33 #include <linux/uaccess.h>
  34
  35 #include "util.h"
  36
  37 int get_compat_ipc64_perm(struct ipc64_perm *to,
  38                           struct compat_ipc64_perm __user *from)
  39 {
  40         struct compat_ipc64_perm v;
  41         if (copy_from_user(&v, from, sizeof(v)))
  42                 return -EFAULT;
  43         to->uid = v.uid;
  44         to->gid = v.gid;
  45         to->mode = v.mode;
  46         return 0;
  47 }
  48
  49 int get_compat_ipc_perm(struct ipc64_perm *to,
  50                         struct compat_ipc_perm __user *from)
  51 {
  52         struct compat_ipc_perm v;
  53         if (copy_from_user(&v, from, sizeof(v)))
  54                 return -EFAULT;
  55         to->uid = v.uid;
  56         to->gid = v.gid;
  57         to->mode = v.mode;
  58         return 0;
  59 }
  60
  61 void to_compat_ipc64_perm(struct compat_ipc64_perm *to, struct ipc64_perm *from)
  62 {
  63         to->key = from->key;
  64         to->uid = from->uid;
  65         to->gid = from->gid;
  66         to->cuid = from->cuid;
  67         to->cgid = from->cgid;
  68         to->mode = from->mode;
  69         to->seq = from->seq;
  70 }
  71
  72 void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from)
  73 {
  74         to->key = from->key;
  75         SET_UID(to->uid, from->uid);
  76         SET_GID(to->gid, from->gid);
  77         SET_UID(to->cuid, from->cuid);
  78         SET_GID(to->cgid, from->cgid);
  79         to->mode = from->mode;
  80         to->seq = from->seq;
  81 }