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* Copyright (C) 2013-2015 Kay Sievers
* Copyright (C) 2013-2015 Greg Kroah-Hartman <>
* Copyright (C) 2013-2015 Daniel Mack <>
* Copyright (C) 2013-2015 David Herrmann <>
* Copyright (C) 2013-2015 Linux Foundation
* Copyright (C) 2014-2015 Djalal Harouni <>
* kdbus is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
#ifndef __KDBUS_UTIL_H
#define __KDBUS_UTIL_H
#include <linux/dcache.h>
#include <linux/ioctl.h>
#include "kdbus.h"
/* all exported addresses are 64 bit */
#define KDBUS_PTR(addr) ((void __user *)(uintptr_t)(addr))
/* all exported sizes are 64 bit and data aligned to 64 bit */
#define KDBUS_ALIGN8(s) ALIGN((s), 8)
#define KDBUS_IS_ALIGNED8(s) (IS_ALIGNED(s, 8))
* kdbus_member_set_user - write a structure member to user memory
* @_s: Variable to copy from
* @_b: Buffer to write to
* @_t: Structure type
* @_m: Member name in the passed structure
* Return: the result of copy_to_user()
#define kdbus_member_set_user(_s, _b, _t, _m) \
({ \
u64 __user *_sz = \
(void __user *)((u8 __user *)(_b) + offsetof(_t, _m)); \
copy_to_user(_sz, _s, sizeof(((_t *)0)->_m)); \
* kdbus_strhash - calculate a hash
* @str: String
* Return: hash value
static inline unsigned int kdbus_strhash(const char *str)
unsigned long hash = init_name_hash();
while (*str)
hash = partial_name_hash(*str++, hash);
return end_name_hash(hash);
int kdbus_verify_uid_prefix(const char *name, struct user_namespace *user_ns,
kuid_t kuid);
int kdbus_sanitize_attach_flags(u64 flags, u64 *attach_flags);
int kdbus_copy_from_user(void *dest, void __user *user_ptr, size_t size);
void *kdbus_memdup_user(void __user *user_ptr, size_t sz_min, size_t sz_max);
struct kvec;
void kdbus_kvec_set(struct kvec *kvec, void *src, size_t len, u64 *total_len);
size_t kdbus_kvec_pad(struct kvec *kvec, u64 *len);
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