compat.c revision b2441318
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