Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
4 * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
5 */
6
7#ifndef __UM_UACCESS_H
8#define __UM_UACCESS_H
9
10#include <asm/elf.h>
11#include <linux/unaligned.h>
12#include <sysdep/faultinfo.h>
13
14#define __under_task_size(addr, size) \
15 (((unsigned long) (addr) < TASK_SIZE) && \
16 (((unsigned long) (addr) + (size)) < TASK_SIZE))
17
18#define __addr_range_nowrap(addr, size) \
19 ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
20
21extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
22extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
23extern unsigned long __clear_user(void __user *mem, unsigned long len);
24static inline int __access_ok(const void __user *ptr, unsigned long size);
25
26/* Teach asm-generic/uaccess.h that we have C functions for these. */
27#define __access_ok __access_ok
28#define __clear_user __clear_user
29
30#define INLINE_COPY_FROM_USER
31#define INLINE_COPY_TO_USER
32
33#include <asm-generic/uaccess.h>
34
35static inline int __access_ok(const void __user *ptr, unsigned long size)
36{
37 unsigned long addr = (unsigned long)ptr;
38 return __addr_range_nowrap(addr, size) && __under_task_size(addr, size);
39}
40
41#define __get_kernel_nofault(dst, src, type, err_label) \
42do { \
43 int __faulted; \
44 \
45 ___backtrack_faulted(__faulted); \
46 if (__faulted) { \
47 *((type *)dst) = (type) 0; \
48 goto err_label; \
49 } \
50 *((type *)dst) = get_unaligned((type *)(src)); \
51 barrier(); \
52 current->thread.segv_continue = NULL; \
53} while (0)
54
55#define __put_kernel_nofault(dst, src, type, err_label) \
56do { \
57 int __faulted; \
58 \
59 ___backtrack_faulted(__faulted); \
60 if (__faulted) \
61 goto err_label; \
62 put_unaligned(*((type *)src), (type *)(dst)); \
63 barrier(); \
64 current->thread.segv_continue = NULL; \
65} while (0)
66
67#endif