aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/instrumented.h
blob: 43e6ea5919759f5edb17ddf6a69514c425d1951f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
/* SPDX-License-Identifier: GPL-2.0 */

/*
 * This header provides generic wrappers for memory access instrumentation that
 * the compiler cannot emit for: KASAN, KCSAN.
 */
#ifndef _LINUX_INSTRUMENTED_H
#define _LINUX_INSTRUMENTED_H

#include <linux/compiler.h>
#include <linux/kasan-checks.h>
#include <linux/kcsan-checks.h>
#include <linux/types.h>

/**
 * instrument_read - instrument regular read access
 *
 * Instrument a regular read access. The instrumentation should be inserted
 * before the actual read happens.
 *
 * @ptr address of access
 * @size size of access
 */
static __always_inline void instrument_read(const volatile void *v, size_t size)
{
	kasan_check_read(v, size);
	kcsan_check_read(v, size);
}

/**
 * instrument_write - instrument regular write access
 *
 * Instrument a regular write access. The instrumentation should be inserted
 * before the actual write happens.
 *
 * @ptr address of access
 * @size size of access
 */
static __always_inline void instrument_write(const volatile void *v, size_t size)
{
	kasan_check_write(v, size);
	kcsan_check_write(v, size);
}

/**
 * instrument_atomic_read - instrument atomic read access
 *
 * Instrument an atomic read access. The instrumentation should be inserted
 * before the actual read happens.
 *
 * @ptr address of access
 * @size size of access
 */
static __always_inline void instrument_atomic_read(const volatile void *v, size_t size)
{
	kasan_check_read(v, size);
	kcsan_check_atomic_read(v, size);
}

/**
 * instrument_atomic_write - instrument atomic write access
 *
 * Instrument an atomic write access. The instrumentation should be inserted
 * before the actual write happens.
 *
 * @ptr address of access
 * @size size of access
 */
static __always_inline void instrument_atomic_write(const volatile void *v, size_t size)
{
	kasan_check_write(v, size);
	kcsan_check_atomic_write(v, size);
}

/**
 * instrument_copy_to_user - instrument reads of copy_to_user
 *
 * Instrument reads from kernel memory, that are due to copy_to_user (and
 * variants). The instrumentation must be inserted before the accesses.
 *
 * @to destination address
 * @from source address
 * @n number of bytes to copy
 */
static __always_inline void
instrument_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	kasan_check_read(from, n);
	kcsan_check_read(from, n);
}

/**
 * instrument_copy_from_user - instrument writes of copy_from_user
 *
 * Instrument writes to kernel memory, that are due to copy_from_user (and
 * variants). The instrumentation should be inserted before the accesses.
 *
 * @to destination address
 * @from source address
 * @n number of bytes to copy
 */
static __always_inline void
instrument_copy_from_user(const void *to, const void __user *from, unsigned long n)
{
	kasan_check_write(to, n);
	kcsan_check_write(to, n);
}

#endif /* _LINUX_INSTRUMENTED_H */

Privacy Policy