root/ipc/compat.c

DEFINITIONS

1. get_compat_ipc64_perm
2. get_compat_ipc_perm
3. to_compat_ipc64_perm
4. to_compat_ipc_perm

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * 32 bit compatibility code for System V IPC
   4  *
   5  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
   7  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   8  * Copyright (C) 2000           VA Linux Co
   9  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
  10  * Copyright (C) 2000           Hewlett-Packard Co.
  11  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  12  * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
  13  * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
  14  * Copyright (C) 2000           Silicon Graphics, Inc.
  15  * Copyright (C) 2001           IBM
  16  * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
  17  * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
  18  *
  19  * This code is collected from the versions for sparc64, mips64, s390x, ia64,
  20  * ppc64 and x86_64, all of which are based on the original sparc64 version
  21  * by Jakub Jelinek.
  22  *
  23  */
  24 #include <linux/compat.h>
  25 #include <linux/errno.h>
  26 #include <linux/highuid.h>
  27 #include <linux/init.h>
  28 #include <linux/msg.h>
  29 #include <linux/shm.h>
  30 #include <linux/syscalls.h>
  31 #include <linux/ptrace.h>
  32 
  33 #include <linux/mutex.h>
  34 #include <linux/uaccess.h>
  35 
  36 #include "util.h"
  37 
  38 int get_compat_ipc64_perm(struct ipc64_perm *to,
  39                           struct compat_ipc64_perm __user *from)
  40 {
  41         struct compat_ipc64_perm v;
  42         if (copy_from_user(&v, from, sizeof(v)))
  43                 return -EFAULT;
  44         to->uid = v.uid;
  45         to->gid = v.gid;
  46         to->mode = v.mode;
  47         return 0;
  48 }
  49 
  50 int get_compat_ipc_perm(struct ipc64_perm *to,
  51                         struct compat_ipc_perm __user *from)
  52 {
  53         struct compat_ipc_perm v;
  54         if (copy_from_user(&v, from, sizeof(v)))
  55                 return -EFAULT;
  56         to->uid = v.uid;
  57         to->gid = v.gid;
  58         to->mode = v.mode;
  59         return 0;
  60 }
  61 
  62 void to_compat_ipc64_perm(struct compat_ipc64_perm *to, struct ipc64_perm *from)
  63 {
  64         to->key = from->key;
  65         to->uid = from->uid;
  66         to->gid = from->gid;
  67         to->cuid = from->cuid;
  68         to->cgid = from->cgid;
  69         to->mode = from->mode;
  70         to->seq = from->seq;
  71 }
  72 
  73 void to_compat_ipc_perm(struct compat_ipc_perm *to, struct ipc64_perm *from)
  74 {
  75         to->key = from->key;
  76         SET_UID(to->uid, from->uid);
  77         SET_GID(to->gid, from->gid);
  78         SET_UID(to->cuid, from->cuid);
  79         SET_GID(to->cgid, from->cgid);
  80         to->mode = from->mode;
  81         to->seq = from->seq;
  82 }