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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | /* | |
4 | * This header provides generic wrappers for memory access instrumentation that | |
5 | * the compiler cannot emit for: KASAN, KCSAN. | |
6 | */ | |
7 | #ifndef _LINUX_INSTRUMENTED_H | |
8 | #define _LINUX_INSTRUMENTED_H | |
9 | ||
10 | #include <linux/compiler.h> | |
11 | #include <linux/kasan-checks.h> | |
12 | #include <linux/kcsan-checks.h> | |
13 | #include <linux/types.h> | |
14 | ||
15 | /** | |
16 | * instrument_read - instrument regular read access | |
17 | * | |
18 | * Instrument a regular read access. The instrumentation should be inserted | |
19 | * before the actual read happens. | |
20 | * | |
21 | * @ptr address of access | |
22 | * @size size of access | |
23 | */ | |
24 | static __always_inline void instrument_read(const volatile void *v, size_t size) | |
25 | { | |
26 | kasan_check_read(v, size); | |
27 | kcsan_check_read(v, size); | |
28 | } | |
29 | ||
30 | /** | |
31 | * instrument_write - instrument regular write access | |
32 | * | |
33 | * Instrument a regular write access. The instrumentation should be inserted | |
34 | * before the actual write happens. | |
35 | * | |
36 | * @ptr address of access | |
37 | * @size size of access | |
38 | */ | |
39 | static __always_inline void instrument_write(const volatile void *v, size_t size) | |
40 | { | |
41 | kasan_check_write(v, size); | |
42 | kcsan_check_write(v, size); | |
43 | } | |
44 | ||
45 | /** | |
46 | * instrument_atomic_read - instrument atomic read access | |
47 | * | |
48 | * Instrument an atomic read access. The instrumentation should be inserted | |
49 | * before the actual read happens. | |
50 | * | |
51 | * @ptr address of access | |
52 | * @size size of access | |
53 | */ | |
54 | static __always_inline void instrument_atomic_read(const volatile void *v, size_t size) | |
55 | { | |
56 | kasan_check_read(v, size); | |
57 | kcsan_check_atomic_read(v, size); | |
58 | } | |
59 | ||
60 | /** | |
61 | * instrument_atomic_write - instrument atomic write access | |
62 | * | |
63 | * Instrument an atomic write access. The instrumentation should be inserted | |
64 | * before the actual write happens. | |
65 | * | |
66 | * @ptr address of access | |
67 | * @size size of access | |
68 | */ | |
69 | static __always_inline void instrument_atomic_write(const volatile void *v, size_t size) | |
70 | { | |
71 | kasan_check_write(v, size); | |
72 | kcsan_check_atomic_write(v, size); | |
73 | } | |
74 | ||
75 | /** | |
76 | * instrument_copy_to_user - instrument reads of copy_to_user | |
77 | * | |
78 | * Instrument reads from kernel memory, that are due to copy_to_user (and | |
79 | * variants). The instrumentation must be inserted before the accesses. | |
80 | * | |
81 | * @to destination address | |
82 | * @from source address | |
83 | * @n number of bytes to copy | |
84 | */ | |
85 | static __always_inline void | |
86 | instrument_copy_to_user(void __user *to, const void *from, unsigned long n) | |
87 | { | |
88 | kasan_check_read(from, n); | |
89 | kcsan_check_read(from, n); | |
90 | } | |
91 | ||
92 | /** | |
93 | * instrument_copy_from_user - instrument writes of copy_from_user | |
94 | * | |
95 | * Instrument writes to kernel memory, that are due to copy_from_user (and | |
96 | * variants). The instrumentation should be inserted before the accesses. | |
97 | * | |
98 | * @to destination address | |
99 | * @from source address | |
100 | * @n number of bytes to copy | |
101 | */ | |
102 | static __always_inline void | |
103 | instrument_copy_from_user(const void *to, const void __user *from, unsigned long n) | |
104 | { | |
105 | kasan_check_write(to, n); | |
106 | kcsan_check_write(to, n); | |
107 | } | |
108 | ||
109 | #endif /* _LINUX_INSTRUMENTED_H */ |