uaccess.h (52fe8d125c9afecc6fff6afd9950a388488df2ce) uaccess.h (12700c17fc286149324f92d6d380bc48e43f253d)
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/uaccess.h
4 *
5 * Copyright (C) 2012 ARM Ltd.
6 */
7#ifndef __ASM_UACCESS_H
8#define __ASM_UACCESS_H

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21#include <asm/asm-extable.h>
22#include <asm/cpufeature.h>
23#include <asm/mmu.h>
24#include <asm/mte.h>
25#include <asm/ptrace.h>
26#include <asm/memory.h>
27#include <asm/extable.h>
28
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/uaccess.h
4 *
5 * Copyright (C) 2012 ARM Ltd.
6 */
7#ifndef __ASM_UACCESS_H
8#define __ASM_UACCESS_H

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21#include <asm/asm-extable.h>
22#include <asm/cpufeature.h>
23#include <asm/mmu.h>
24#include <asm/mte.h>
25#include <asm/ptrace.h>
26#include <asm/memory.h>
27#include <asm/extable.h>
28
29static inline int __access_ok(const void __user *ptr, unsigned long size)
30{
31 unsigned long limit = TASK_SIZE_MAX;
32 unsigned long addr = (unsigned long)ptr;
29static inline int __access_ok(const void __user *ptr, unsigned long size);
33
30
34 return (size <= limit) && (addr <= (limit - size));
35}
36
37/*
38 * Test whether a block of memory is a valid user space address.
39 * Returns 1 if the range is valid, 0 otherwise.
40 *
41 * This is equivalent to the following test:
42 * (u65)addr + (u65)size <= (u65)TASK_SIZE_MAX
43 */
44static inline int access_ok(const void __user *addr, unsigned long size)

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49 * the user address before checking.
50 */
51 if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI) &&
52 (current->flags & PF_KTHREAD || test_thread_flag(TIF_TAGGED_ADDR)))
53 addr = untagged_addr(addr);
54
55 return likely(__access_ok(addr, size));
56}
31/*
32 * Test whether a block of memory is a valid user space address.
33 * Returns 1 if the range is valid, 0 otherwise.
34 *
35 * This is equivalent to the following test:
36 * (u65)addr + (u65)size <= (u65)TASK_SIZE_MAX
37 */
38static inline int access_ok(const void __user *addr, unsigned long size)

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43 * the user address before checking.
44 */
45 if (IS_ENABLED(CONFIG_ARM64_TAGGED_ADDR_ABI) &&
46 (current->flags & PF_KTHREAD || test_thread_flag(TIF_TAGGED_ADDR)))
47 addr = untagged_addr(addr);
48
49 return likely(__access_ok(addr, size));
50}
51#define access_ok access_ok
57
52
53#include <asm-generic/access_ok.h>
54
58/*
59 * User access enabling/disabling.
60 */
61#ifdef CONFIG_ARM64_SW_TTBR0_PAN
62static inline void __uaccess_ttbr0_disable(void)
63{
64 unsigned long flags, ttbr;
65

--- 401 unchanged lines hidden --- 		55/*
56 * User access enabling/disabling.
57 */
58#ifdef CONFIG_ARM64_SW_TTBR0_PAN
59static inline void __uaccess_ttbr0_disable(void)
60{
61 unsigned long flags, ttbr;
62

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