LXR linux/ipc/compat.c

   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
  38int 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
  50int 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
  62void 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
  73void 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}
  83